Merge tag 'v3.10.69' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sched / fair.c

/*
 * Completely Fair Scheduling (CFS) Class (SCHED_NORMAL/SCHED_BATCH)
 *
 *  Copyright (C) 2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *
 *  Interactivity improvements by Mike Galbraith
 *  (C) 2007 Mike Galbraith <efault@gmx.de>
 *
 *  Various enhancements by Dmitry Adamushko.
 *  (C) 2007 Dmitry Adamushko <dmitry.adamushko@gmail.com>
 *
 *  Group scheduling enhancements by Srivatsa Vaddagiri
 *  Copyright IBM Corporation, 2007
 *  Author: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
 *
 *  Scaled math optimizations by Thomas Gleixner
 *  Copyright (C) 2007, Thomas Gleixner <tglx@linutronix.de>
 *
 *  Adaptive scheduling granularity, math enhancements by Peter Zijlstra
 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
 */

#include <linux/latencytop.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/slab.h>
#include <linux/profile.h>
#include <linux/interrupt.h>
#include <linux/mempolicy.h>
#include <linux/migrate.h>
#include <linux/task_work.h>

#include <trace/events/sched.h>
#ifdef CONFIG_HMP_VARIABLE_SCALE
#include <linux/sysfs.h>
#include <linux/vmalloc.h>
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
/* Include cpufreq header to add a notifier so that cpu frequency
 * scaling can track the current CPU frequency
 */
#include <linux/cpufreq.h>
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */
#endif /* CONFIG_HMP_VARIABLE_SCALE */

#include "sched.h"

#include <mtlbprof/mtlbprof.h>


#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
#ifdef CONFIG_LOCAL_TIMERS
unsigned long localtimer_get_counter(void);
#endif
#endif

#ifdef CONFIG_HEVTASK_INTERFACE
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#ifdef CONFIG_KGDB_KDB
#include <linux/kdb.h>
#endif
#endif

/*
 * Targeted preemption latency for CPU-bound tasks:
 * (default: 6ms * (1 + ilog(ncpus)), units: nanoseconds)
 *
 * NOTE: this latency value is not the same as the concept of
 * 'timeslice length' - timeslices in CFS are of variable length
 * and have no persistent notion like in traditional, time-slice
 * based scheduling concepts.
 *
 * (to see the precise effective timeslice length of your workload,
 *  run vmstat and monitor the context-switches (cs) field)
 */
unsigned int sysctl_sched_latency = 6000000ULL;
unsigned int normalized_sysctl_sched_latency = 6000000ULL;

/*
 * The initial- and re-scaling of tunables is configurable
 * (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
 *
 * Options are:
 * SCHED_TUNABLESCALING_NONE - unscaled, always *1
 * SCHED_TUNABLESCALING_LOG - scaled logarithmical, *1+ilog(ncpus)
 * SCHED_TUNABLESCALING_LINEAR - scaled linear, *ncpus
 */
enum sched_tunable_scaling sysctl_sched_tunable_scaling
        = SCHED_TUNABLESCALING_LOG;

/*
 * Minimal preemption granularity for CPU-bound tasks:
 * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
 */
unsigned int sysctl_sched_min_granularity = 750000ULL;
unsigned int normalized_sysctl_sched_min_granularity = 750000ULL;

/*
 * is kept at sysctl_sched_latency / sysctl_sched_min_granularity
 */
static unsigned int sched_nr_latency = 8;

/*
 * After fork, child runs first. If set to 0 (default) then
 * parent will (try to) run first.
 */
unsigned int sysctl_sched_child_runs_first __read_mostly;

/*
 * SCHED_OTHER wake-up granularity.
 * (default: 1 msec * (1 + ilog(ncpus)), units: nanoseconds)
 *
 * This option delays the preemption effects of decoupled workloads
 * and reduces their over-scheduling. Synchronous workloads will still
 * have immediate wakeup/sleep latencies.
 */
unsigned int sysctl_sched_wakeup_granularity = 1000000UL;
unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL;

const_debug unsigned int sysctl_sched_migration_cost = 100000UL;

/*
 * The exponential sliding  window over which load is averaged for shares
 * distribution.
 * (default: 10msec)
 */
unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL;

#ifdef CONFIG_CFS_BANDWIDTH
/*
 * Amount of runtime to allocate from global (tg) to local (per-cfs_rq) pool
 * each time a cfs_rq requests quota.
 *
 * Note: in the case that the slice exceeds the runtime remaining (either due
 * to consumption or the quota being specified to be smaller than the slice)
 * we will always only issue the remaining available time.
 *
 * default: 5 msec, units: microseconds
  */
unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
#endif
#if defined (CONFIG_MTK_SCHED_CMP_LAZY_BALANCE) && !defined(CONFIG_HMP_LAZY_BALANCE)
static int need_lazy_balance(int dst_cpu, int src_cpu, struct task_struct *p);
#endif

/*
 * Increase the granularity value when there are more CPUs,
 * because with more CPUs the 'effective latency' as visible
 * to users decreases. But the relationship is not linear,
 * so pick a second-best guess by going with the log2 of the
 * number of CPUs.
 *
 * This idea comes from the SD scheduler of Con Kolivas:
 */
static int get_update_sysctl_factor(void)
{
        unsigned int cpus = min_t(int, num_online_cpus(), 8);
        unsigned int factor;

        switch (sysctl_sched_tunable_scaling) {
        case SCHED_TUNABLESCALING_NONE:
                factor = 1;
                break;
        case SCHED_TUNABLESCALING_LINEAR:
                factor = cpus;
                break;
        case SCHED_TUNABLESCALING_LOG:
        default:
                factor = 1 + ilog2(cpus);
                break;
        }

        return factor;
}

static void update_sysctl(void)
{
        unsigned int factor = get_update_sysctl_factor();

#define SET_SYSCTL(name) \
        (sysctl_##name = (factor) * normalized_sysctl_##name)
        SET_SYSCTL(sched_min_granularity);
        SET_SYSCTL(sched_latency);
        SET_SYSCTL(sched_wakeup_granularity);
#undef SET_SYSCTL
}

void sched_init_granularity(void)
{
        update_sysctl();
}
#if defined (CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK) || defined (CONFIG_HMP_PACK_SMALL_TASK)
/*
 * Save the id of the optimal CPU that should be used to pack small tasks
 * The value -1 is used when no buddy has been found
 */
DEFINE_PER_CPU(int, sd_pack_buddy) = {-1};

#ifdef CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK 
struct cpumask buddy_cpu_map = {{0}};
#endif

/* Look for the best buddy CPU that can be used to pack small tasks
 * We make the assumption that it doesn't wort to pack on CPU that share the
 * same powerline. We looks for the 1st sched_domain without the
 * SD_SHARE_POWERLINE flag. Then We look for the sched_group witht the lowest
 * power per core based on the assumption that their power efficiency is
 * better */
void update_packing_domain(int cpu)
{
        struct sched_domain *sd;
        int id = -1;

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
        pr_info("[PACK] update_packing_domain() CPU%d\n", cpu);
#endif /* CONFIG_MTK_SCHED_CMP_PACK_BUDDY_INFO || CONFIG_HMP_PACK_BUDDY_INFO */
        mt_sched_printf("[PACK] update_packing_domain() CPU%d", cpu);

        sd = highest_flag_domain(cpu, SD_SHARE_POWERLINE);
        if (!sd)
        {
                sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd);
        }
        else
                if (cpumask_first(sched_domain_span(sd)) == cpu || !sd->parent)
                        sd = sd->parent;

        while (sd) {
                struct sched_group *sg = sd->groups;
                struct sched_group *pack = sg;
                struct sched_group *tmp = sg->next;

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                pr_info("[PACK]  sd = 0x%08x, flags = %d\n", (unsigned int)sd, sd->flags);
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                pr_info("[PACK]  sg = 0x%08x\n", (unsigned int)sg);
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */

                /* 1st CPU of the sched domain is a good candidate */
                if (id == -1)
                        id = cpumask_first(sched_domain_span(sd));

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                pr_info("[PACK]  First cpu in this sd id = %d\n", id);
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */

                /* Find sched group of candidate */
                tmp = sd->groups;
                do {
                        if (cpumask_test_cpu(id, sched_group_cpus(tmp))) {
                                sg = tmp;
                                break;
                        }
                } while (tmp = tmp->next, tmp != sd->groups);

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                pr_info("[PACK]  pack = 0x%08x\n", (unsigned int)sg);
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */

                pack = sg;
                tmp = sg->next;

                /* loop the sched groups to find the best one */
                //Stop find the best one in the same Load Balance Domain
                //while (tmp != sg) {
                while (tmp != sg && !(sd->flags & SD_LOAD_BALANCE)) {
                        if (tmp->sgp->power * sg->group_weight <
                                        sg->sgp->power * tmp->group_weight) {

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                                pr_info("[PACK]  Now sg power = %u, weight = %u, mask = %lu\n", sg->sgp->power, sg->group_weight, sg->cpumask[0]);
                                pr_info("[PACK]  Better sg power = %u, weight = %u, mask = %lu\n", tmp->sgp->power, tmp->group_weight, tmp->cpumask[0]);        
#endif /* CONFIG_MTK_SCHED_CMP_PACK_BUDDY_INFO || CONFIG_HMP_PACK_BUDDY_INFO */
      
                                pack = tmp;
                        }
                        tmp = tmp->next;
                }

                /* we have found a better group */
                if (pack != sg) {
                        id = cpumask_first(sched_group_cpus(pack));

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                        pr_info("[PACK]  Better sg, first cpu id = %d\n", id);
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */

                }

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                if(sd->parent) {
                        pr_info("[PACK]  cpu = %d, id = %d, sd->parent = 0x%08x, flags = %d, SD_LOAD_BALANCE = %d\n", cpu, id, (unsigned int)sd->parent, sd->parent->flags, SD_LOAD_BALANCE);
                        pr_info("[PACK]  %d\n", (id != cpu)); 
                        pr_info("[PACK]  0x%08x\n", (unsigned int)(sd->parent));  
                        pr_info("[PACK]  %d\n", (sd->parent->flags & SD_LOAD_BALANCE));      
                }
                else {
                        pr_info("[PACK]  cpu = %d, id = %d, sd->parent = 0x%08x\n", cpu, id, (unsigned int)sd->parent);      
                }
#endif /* CONFIG_HMP_PACK_BUDDY_INFO */
        

                /* Look for another CPU than itself */
                if ((id != cpu) || 
                                ((sd->parent) && (sd->parent->flags & SD_LOAD_BALANCE))) {

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
                        pr_info("[PACK]  Break\n");
#endif /*CONFIG_HMP_PACK_BUDDY_INFO */

                        break;
                }
                sd = sd->parent;
        }

#ifdef CONFIG_HMP_PACK_BUDDY_INFO
        pr_info("[PACK] CPU%d packing on CPU%d\n", cpu, id);
#endif /* CONFIG_MTK_SCHED_CMP_PACK_BUDDY_INFO || CONFIG_HMP_PACK_BUDDY_INFO */
        mt_sched_printf("[PACK] CPU%d packing on CPU%d", cpu, id);

#ifdef CONFIG_HMP_PACK_SMALL_TASK
        per_cpu(sd_pack_buddy, cpu) = id;
#else /* CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK */
        if(per_cpu(sd_pack_buddy, cpu) != -1)
                cpu_clear(per_cpu(sd_pack_buddy, cpu), buddy_cpu_map);
        per_cpu(sd_pack_buddy, cpu) = id;
        if(id != -1)
                cpumask_set_cpu(id, &buddy_cpu_map);
#endif
}

#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_USAGE);
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_PERIOD);
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_NR);
DEFINE_PER_CPU(u32, TASK_USGAE);
DEFINE_PER_CPU(u32, TASK_PERIOD);
u32 PACK_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 AVOID_LOAD_BALANCE_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 AVOID_WAKE_UP_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 TASK_PACK_CPU_COUNT[4][NR_CPUS] = {{0}};
u32 PA_ENABLE = 1;
u32 PA_MON_ENABLE = 0;
char PA_MON[4][TASK_COMM_LEN]={{0}};
#endif /* CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER */

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_USAGE);
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_PERIOD);
DEFINE_PER_CPU(u32, BUDDY_CPU_RQ_NR);
DEFINE_PER_CPU(u32, TASK_USGAE);
DEFINE_PER_CPU(u32, TASK_PERIOD);
u32 PACK_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 AVOID_LOAD_BALANCE_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 AVOID_WAKE_UP_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 HMP_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
u32 PA_ENABLE = 1;
u32 LB_ENABLE = 1;
u32 PA_MON_ENABLE = 0;
char PA_MON[TASK_COMM_LEN];

#ifdef CONFIG_HMP_TRACER
#define POWER_AWARE_ACTIVE_MODULE_PACK_FORM_CPUX_TO_CPUY (0)
#define POWER_AWARE_ACTIVE_MODULE_AVOID_WAKE_UP_FORM_CPUX_TO_CPUY (1)
#define POWER_AWARE_ACTIVE_MODULE_AVOID_BALANCE_FORM_CPUX_TO_CPUY (2)
#define POWER_AWARE_ACTIVE_MODULE_AVOID_FORCE_UP_FORM_CPUX_TO_CPUY (3)
#endif /* CONFIG_HMP_TRACER */

#endif /* CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER */


static inline bool is_buddy_busy(int cpu)
{
#ifdef CONFIG_HMP_PACK_SMALL_TASK
        struct rq *rq;

    if (cpu < 0)
        return 0;

    rq = cpu_rq(cpu);
#else  /* CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK */
                struct rq *rq = cpu_rq(cpu);
#endif
        /*
         * A busy buddy is a CPU with a high load or a small load with a lot of
         * running tasks.
         */

#if defined (CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER) || defined (CONFIG_HMP_POWER_AWARE_CONTROLLER)
        per_cpu(BUDDY_CPU_RQ_USAGE, cpu) = rq->avg.usage_avg_sum;
        per_cpu(BUDDY_CPU_RQ_PERIOD, cpu) = rq->avg.runnable_avg_period;        
        per_cpu(BUDDY_CPU_RQ_NR, cpu) = rq->nr_running; 
#endif /*(CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER) || defined (CONFIG_HMP_POWER_AWARE_CONTROLLER) */

        return ((rq->avg.usage_avg_sum << rq->nr_running) >
                        rq->avg.runnable_avg_period);

}

static inline bool is_light_task(struct task_struct *p)
{
#if defined (CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER) || defined (CONFIG_HMP_POWER_AWARE_CONTROLLER) 
        per_cpu(TASK_USGAE, task_cpu(p)) = p->se.avg.usage_avg_sum;
        per_cpu(TASK_PERIOD, task_cpu(p)) = p->se.avg.runnable_avg_period;      
#endif /* CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER || CONFIG_HMP_POWER_AWARE_CONTROLLER*/

        /* A light task runs less than 25% in average */
        return ((p->se.avg.usage_avg_sum << 2) < p->se.avg.runnable_avg_period);
}


static int check_pack_buddy(int cpu, struct task_struct *p)
{
#ifdef CONFIG_HMP_PACK_SMALL_TASK
        int buddy;
        
        if(cpu >= NR_CPUS || cpu < 0)
                return false; 
        buddy = per_cpu(sd_pack_buddy, cpu);
#else /* CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK */
        int buddy = cpu;
#endif

        /* No pack buddy for this CPU */
        if (buddy == -1)
                return false;

        /*
         * If a task is waiting for running on the CPU which is its own buddy,
         * let the default behavior to look for a better CPU if available
         * The threshold has been set to 37.5%
         */
#ifdef CONFIG_HMP_PACK_SMALL_TASK
        if ((buddy == cpu)
         && ((p->se.avg.usage_avg_sum << 3) < (p->se.avg.runnable_avg_sum * 5)))
                return false;
#endif

        /* buddy is not an allowed CPU */
        if (!cpumask_test_cpu(buddy, tsk_cpus_allowed(p)))
                return false;

        /*
         * If the task is a small one and the buddy is not overloaded,
         * we use buddy cpu
         */
         if (!is_light_task(p) || is_buddy_busy(buddy))
                return false;

        return true;
}
#endif /* CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK || CONFIG_HMP_PACK_SMALL_TASK*/

#if BITS_PER_LONG == 32
# define WMULT_CONST    (~0UL)
#else
# define WMULT_CONST    (1UL << 32)
#endif

#define WMULT_SHIFT     32

/*
 * Shift right and round:
 */
#define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y))

/*
 * delta *= weight / lw
 */
static unsigned long
calc_delta_mine(unsigned long delta_exec, unsigned long weight,
                struct load_weight *lw)
{
        u64 tmp;

        /*
         * weight can be less than 2^SCHED_LOAD_RESOLUTION for task group sched
         * entities since MIN_SHARES = 2. Treat weight as 1 if less than
         * 2^SCHED_LOAD_RESOLUTION.
         */
        if (likely(weight > (1UL << SCHED_LOAD_RESOLUTION)))
                tmp = (u64)delta_exec * scale_load_down(weight);
        else
                tmp = (u64)delta_exec;

        if (!lw->inv_weight) {
                unsigned long w = scale_load_down(lw->weight);

                if (BITS_PER_LONG > 32 && unlikely(w >= WMULT_CONST))
                        lw->inv_weight = 1;
                else if (unlikely(!w))
                        lw->inv_weight = WMULT_CONST;
                else
                        lw->inv_weight = WMULT_CONST / w;
        }

        /*
         * Check whether we'd overflow the 64-bit multiplication:
         */
        if (unlikely(tmp > WMULT_CONST))
                tmp = SRR(SRR(tmp, WMULT_SHIFT/2) * lw->inv_weight,
                        WMULT_SHIFT/2);
        else
                tmp = SRR(tmp * lw->inv_weight, WMULT_SHIFT);

        return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX);
}


const struct sched_class fair_sched_class;

/**************************************************************
 * CFS operations on generic schedulable entities:
 */

#ifdef CONFIG_FAIR_GROUP_SCHED

/* cpu runqueue to which this cfs_rq is attached */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
        return cfs_rq->rq;
}

/* An entity is a task if it doesn't "own" a runqueue */
#define entity_is_task(se)      (!se->my_q)

static inline struct task_struct *task_of(struct sched_entity *se)
{
#ifdef CONFIG_SCHED_DEBUG
        WARN_ON_ONCE(!entity_is_task(se));
#endif
        return container_of(se, struct task_struct, se);
}

/* Walk up scheduling entities hierarchy */
#define for_each_sched_entity(se) \
                for (; se; se = se->parent)

static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
{
        return p->se.cfs_rq;
}

/* runqueue on which this entity is (to be) queued */
static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
{
        return se->cfs_rq;
}

/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
        return grp->my_q;
}

static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq,
                                       int force_update);

static inline void list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
        if (!cfs_rq->on_list) {
                /*
                 * Ensure we either appear before our parent (if already
                 * enqueued) or force our parent to appear after us when it is
                 * enqueued.  The fact that we always enqueue bottom-up
                 * reduces this to two cases.
                 */
                if (cfs_rq->tg->parent &&
                    cfs_rq->tg->parent->cfs_rq[cpu_of(rq_of(cfs_rq))]->on_list) {
                        list_add_rcu(&cfs_rq->leaf_cfs_rq_list,
                                &rq_of(cfs_rq)->leaf_cfs_rq_list);
                } else {
                        list_add_tail_rcu(&cfs_rq->leaf_cfs_rq_list,
                                &rq_of(cfs_rq)->leaf_cfs_rq_list);
                }

                cfs_rq->on_list = 1;
                /* We should have no load, but we need to update last_decay. */
                update_cfs_rq_blocked_load(cfs_rq, 0);
        }
}

static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
        if (cfs_rq->on_list) {
                list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
                cfs_rq->on_list = 0;
        }
}

/* Iterate thr' all leaf cfs_rq's on a runqueue */
#define for_each_leaf_cfs_rq(rq, cfs_rq) \
        list_for_each_entry_rcu(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)

/* Do the two (enqueued) entities belong to the same group ? */
static inline int
is_same_group(struct sched_entity *se, struct sched_entity *pse)
{
        if (se && pse)
        {
                if (se->cfs_rq == pse->cfs_rq)
                        return 1;
        }

        return 0;
}

static inline struct sched_entity *parent_entity(struct sched_entity *se)
{
        return se->parent;
}

/* return depth at which a sched entity is present in the hierarchy */
static inline int depth_se(struct sched_entity *se)
{
        int depth = 0;

        for_each_sched_entity(se)
                depth++;

        return depth;
}

static void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
        int se_depth, pse_depth;

        /*
         * preemption test can be made between sibling entities who are in the
         * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
         * both tasks until we find their ancestors who are siblings of common
         * parent.
         */

        /* First walk up until both entities are at same depth */
        se_depth = depth_se(*se);
        pse_depth = depth_se(*pse);

        while (se_depth > pse_depth) {
                se_depth--;
                *se = parent_entity(*se);
        }

        while (pse_depth > se_depth) {
                pse_depth--;
                *pse = parent_entity(*pse);
        }

        while (!is_same_group(*se, *pse)) {
                *se = parent_entity(*se);
                *pse = parent_entity(*pse);
        }
}

#else   /* !CONFIG_FAIR_GROUP_SCHED */

static inline struct task_struct *task_of(struct sched_entity *se)
{
        return container_of(se, struct task_struct, se);
}

static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
        return container_of(cfs_rq, struct rq, cfs);
}

#define entity_is_task(se)      1

#define for_each_sched_entity(se) \
                for (; se; se = NULL)

static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
{
        return &task_rq(p)->cfs;
}

static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se)
{
        struct task_struct *p = task_of(se);
        struct rq *rq = task_rq(p);

        return &rq->cfs;
}

/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
        return NULL;
}

static inline void list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
}

static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
}

#define for_each_leaf_cfs_rq(rq, cfs_rq) \
                for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)

static inline int
is_same_group(struct sched_entity *se, struct sched_entity *pse)
{
        return 1;
}

static inline struct sched_entity *parent_entity(struct sched_entity *se)
{
        return NULL;
}

static inline void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
}

#endif  /* CONFIG_FAIR_GROUP_SCHED */

static __always_inline
void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, unsigned long delta_exec);

/**************************************************************
 * Scheduling class tree data structure manipulation methods:
 */

static inline u64 max_vruntime(u64 max_vruntime, u64 vruntime)
{
        s64 delta = (s64)(vruntime - max_vruntime);
        if (delta > 0)
                max_vruntime = vruntime;

        return max_vruntime;
}

static inline u64 min_vruntime(u64 min_vruntime, u64 vruntime)
{
        s64 delta = (s64)(vruntime - min_vruntime);
        if (delta < 0)
                min_vruntime = vruntime;

        return min_vruntime;
}

static inline int entity_before(struct sched_entity *a,
                                struct sched_entity *b)
{
        return (s64)(a->vruntime - b->vruntime) < 0;
}

static void update_min_vruntime(struct cfs_rq *cfs_rq)
{
        u64 vruntime = cfs_rq->min_vruntime;

        if (cfs_rq->curr)
                vruntime = cfs_rq->curr->vruntime;

        if (cfs_rq->rb_leftmost) {
                struct sched_entity *se = rb_entry(cfs_rq->rb_leftmost,
                                                   struct sched_entity,
                                                   run_node);

                if (!cfs_rq->curr)
                        vruntime = se->vruntime;
                else
                        vruntime = min_vruntime(vruntime, se->vruntime);
        }

        /* ensure we never gain time by being placed backwards. */
        cfs_rq->min_vruntime = max_vruntime(cfs_rq->min_vruntime, vruntime);
#ifndef CONFIG_64BIT
        smp_wmb();
        cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
#endif
}

/*
 * Enqueue an entity into the rb-tree:
 */
static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        struct rb_node **link = &cfs_rq->tasks_timeline.rb_node;
        struct rb_node *parent = NULL;
        struct sched_entity *entry;
        int leftmost = 1;

        /*
         * Find the right place in the rbtree:
         */
        while (*link) {
                parent = *link;
                entry = rb_entry(parent, struct sched_entity, run_node);
                /*
                 * We dont care about collisions. Nodes with
                 * the same key stay together.
                 */
                if (entity_before(se, entry)) {
                        link = &parent->rb_left;
                } else {
                        link = &parent->rb_right;
                        leftmost = 0;
                }
        }

        /*
         * Maintain a cache of leftmost tree entries (it is frequently
         * used):
         */
        if (leftmost)
                cfs_rq->rb_leftmost = &se->run_node;

        rb_link_node(&se->run_node, parent, link);
        rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline);
}

static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        if (cfs_rq->rb_leftmost == &se->run_node) {
                struct rb_node *next_node;

                next_node = rb_next(&se->run_node);
                cfs_rq->rb_leftmost = next_node;
        }

        rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
}

struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq)
{
        struct rb_node *left = cfs_rq->rb_leftmost;

        if (!left)
                return NULL;

        return rb_entry(left, struct sched_entity, run_node);
}

static struct sched_entity *__pick_next_entity(struct sched_entity *se)
{
        struct rb_node *next = rb_next(&se->run_node);

        if (!next)
                return NULL;

        return rb_entry(next, struct sched_entity, run_node);
}

#ifdef CONFIG_SCHED_DEBUG
struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
{
        struct rb_node *last = rb_last(&cfs_rq->tasks_timeline);

        if (!last)
                return NULL;

        return rb_entry(last, struct sched_entity, run_node);
}

/**************************************************************
 * Scheduling class statistics methods:
 */

int sched_proc_update_handler(struct ctl_table *table, int write,
                void __user *buffer, size_t *lenp,
                loff_t *ppos)
{
        int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
        int factor = get_update_sysctl_factor();

        if (ret || !write)
                return ret;

        sched_nr_latency = DIV_ROUND_UP(sysctl_sched_latency,
                                        sysctl_sched_min_granularity);

#define WRT_SYSCTL(name) \
        (normalized_sysctl_##name = sysctl_##name / (factor))
        WRT_SYSCTL(sched_min_granularity);
        WRT_SYSCTL(sched_latency);
        WRT_SYSCTL(sched_wakeup_granularity);
#undef WRT_SYSCTL

        return 0;
}
#endif

/*
 * delta /= w
 */
static inline unsigned long
calc_delta_fair(unsigned long delta, struct sched_entity *se)
{
        if (unlikely(se->load.weight != NICE_0_LOAD))
                delta = calc_delta_mine(delta, NICE_0_LOAD, &se->load);

        return delta;
}

/*
 * The idea is to set a period in which each task runs once.
 *
 * When there are too many tasks (sched_nr_latency) we have to stretch
 * this period because otherwise the slices get too small.
 *
 * p = (nr <= nl) ? l : l*nr/nl
 */
static u64 __sched_period(unsigned long nr_running)
{
        u64 period = sysctl_sched_latency;
        unsigned long nr_latency = sched_nr_latency;

        if (unlikely(nr_running > nr_latency)) {
                period = sysctl_sched_min_granularity;
                period *= nr_running;
        }

        return period;
}

/*
 * We calculate the wall-time slice from the period by taking a part
 * proportional to the weight.
 *
 * s = p*P[w/rw]
 */
static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        u64 slice = __sched_period(cfs_rq->nr_running + !se->on_rq);

        for_each_sched_entity(se) {
                struct load_weight *load;
                struct load_weight lw;

                cfs_rq = cfs_rq_of(se);
                load = &cfs_rq->load;

                if (unlikely(!se->on_rq)) {
                        lw = cfs_rq->load;

                        update_load_add(&lw, se->load.weight);
                        load = &lw;
                }
                slice = calc_delta_mine(slice, se->load.weight, load);
        }
        return slice;
}

/*
 * We calculate the vruntime slice of a to-be-inserted task.
 *
 * vs = s/w
 */
static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        return calc_delta_fair(sched_slice(cfs_rq, se), se);
}


#ifdef CONFIG_SMP
static inline void __update_task_entity_contrib(struct sched_entity *se);

static long __update_task_entity_ratio(struct sched_entity *se);

#define LOAD_AVG_PERIOD 32
#define LOAD_AVG_MAX 47742 /* maximum possible load avg */
#define LOAD_AVG_MAX_N 345 /* number of full periods to produce LOAD_MAX_AVG */
#define LOAD_AVG_VARIABLE_PERIOD 512
static unsigned int init_task_load_period = 4000;

/* Give new task start runnable values to heavy its load in infant time */
void init_task_runnable_average(struct task_struct *p)
{
        u32 slice;

        p->se.avg.decay_count = 0;
        slice = sched_slice(task_cfs_rq(p), &p->se) >> 10;
        p->se.avg.runnable_avg_sum = (init_task_load_period) ? 0 : slice;
        p->se.avg.runnable_avg_period = (init_task_load_period)?(init_task_load_period):slice;
        __update_task_entity_contrib(&p->se);

#ifdef CONFIG_MTK_SCHED_CMP
        /* usage_avg_sum & load_avg_ratio are based on Linaro 12.11. */
        p->se.avg.usage_avg_sum =  (init_task_load_period) ? 0 : slice;
#endif
        __update_task_entity_ratio(&p->se);
        trace_sched_task_entity_avg(0, p, &p->se.avg);
}
#else
void init_task_runnable_average(struct task_struct *p)
{
}
#endif

/*
 * Update the current task's runtime statistics. Skip current tasks that
 * are not in our scheduling class.
 */
static inline void
__update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
              unsigned long delta_exec)
{
        unsigned long delta_exec_weighted;

        schedstat_set(curr->statistics.exec_max,
                      max((u64)delta_exec, curr->statistics.exec_max));

        curr->sum_exec_runtime += delta_exec;
        schedstat_add(cfs_rq, exec_clock, delta_exec);
        delta_exec_weighted = calc_delta_fair(delta_exec, curr);

        curr->vruntime += delta_exec_weighted;
        update_min_vruntime(cfs_rq);
}

static void update_curr(struct cfs_rq *cfs_rq)
{
        struct sched_entity *curr = cfs_rq->curr;
        u64 now = rq_of(cfs_rq)->clock_task;
        unsigned long delta_exec;

        if (unlikely(!curr))
                return;

        /*
         * Get the amount of time the current task was running
         * since the last time we changed load (this cannot
         * overflow on 32 bits):
         */
        delta_exec = (unsigned long)(now - curr->exec_start);
        if (!delta_exec)
                return;

        __update_curr(cfs_rq, curr, delta_exec);
        curr->exec_start = now;

        if (entity_is_task(curr)) {
                struct task_struct *curtask = task_of(curr);

                trace_sched_stat_runtime(curtask, delta_exec, curr->vruntime);
                cpuacct_charge(curtask, delta_exec);
                account_group_exec_runtime(curtask, delta_exec);
        }

        account_cfs_rq_runtime(cfs_rq, delta_exec);
}

static inline void
update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        schedstat_set(se->statistics.wait_start, rq_of(cfs_rq)->clock);
}

/*
 * Task is being enqueued - update stats:
 */
static void update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        /*
         * Are we enqueueing a waiting task? (for current tasks
         * a dequeue/enqueue event is a NOP)
         */
        if (se != cfs_rq->curr)
                update_stats_wait_start(cfs_rq, se);
}

static void
update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        schedstat_set(se->statistics.wait_max, max(se->statistics.wait_max,
                        rq_of(cfs_rq)->clock - se->statistics.wait_start));
        schedstat_set(se->statistics.wait_count, se->statistics.wait_count + 1);
        schedstat_set(se->statistics.wait_sum, se->statistics.wait_sum +
                        rq_of(cfs_rq)->clock - se->statistics.wait_start);
#ifdef CONFIG_SCHEDSTATS
        if (entity_is_task(se)) {
                trace_sched_stat_wait(task_of(se),
                        rq_of(cfs_rq)->clock - se->statistics.wait_start);
        }
#endif
        schedstat_set(se->statistics.wait_start, 0);
}

static inline void
update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        /*
         * Mark the end of the wait period if dequeueing a
         * waiting task:
         */
        if (se != cfs_rq->curr)
                update_stats_wait_end(cfs_rq, se);
}

/*
 * We are picking a new current task - update its stats:
 */
static inline void
update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        /*
         * We are starting a new run period:
         */
        se->exec_start = rq_of(cfs_rq)->clock_task;
}

/**************************************************
 * Scheduling class queueing methods:
 */

#ifdef CONFIG_NUMA_BALANCING
/*
 * numa task sample period in ms
 */
unsigned int sysctl_numa_balancing_scan_period_min = 100;
unsigned int sysctl_numa_balancing_scan_period_max = 100*50;
unsigned int sysctl_numa_balancing_scan_period_reset = 100*600;

/* Portion of address space to scan in MB */
unsigned int sysctl_numa_balancing_scan_size = 256;

/* Scan @scan_size MB every @scan_period after an initial @scan_delay in ms */
unsigned int sysctl_numa_balancing_scan_delay = 1000;

static void task_numa_placement(struct task_struct *p)
{
        int seq;

        if (!p->mm)     /* for example, ksmd faulting in a user's mm */
                return;
        seq = ACCESS_ONCE(p->mm->numa_scan_seq);
        if (p->numa_scan_seq == seq)
                return;
        p->numa_scan_seq = seq;

        /* FIXME: Scheduling placement policy hints go here */
}

/*
 * Got a PROT_NONE fault for a page on @node.
 */
void task_numa_fault(int node, int pages, bool migrated)
{
        struct task_struct *p = current;

        if (!sched_feat_numa(NUMA))
                return;

        /* FIXME: Allocate task-specific structure for placement policy here */

        /*
         * If pages are properly placed (did not migrate) then scan slower.
         * This is reset periodically in case of phase changes
         */
        if (!migrated)
                p->numa_scan_period = min(sysctl_numa_balancing_scan_period_max,
                        p->numa_scan_period + jiffies_to_msecs(10));

        task_numa_placement(p);
}

static void reset_ptenuma_scan(struct task_struct *p)
{
        ACCESS_ONCE(p->mm->numa_scan_seq)++;
        p->mm->numa_scan_offset = 0;
}

/*
 * The expensive part of numa migration is done from task_work context.
 * Triggered from task_tick_numa().
 */
void task_numa_work(struct callback_head *work)
{
        unsigned long migrate, next_scan, now = jiffies;
        struct task_struct *p = current;
        struct mm_struct *mm = p->mm;
        struct vm_area_struct *vma;
        unsigned long start, end;
        long pages;

        WARN_ON_ONCE(p != container_of(work, struct task_struct, numa_work));

        work->next = work; /* protect against double add */
        /*
         * Who cares about NUMA placement when they're dying.
         *
         * NOTE: make sure not to dereference p->mm before this check,
         * exit_task_work() happens _after_ exit_mm() so we could be called
         * without p->mm even though we still had it when we enqueued this
         * work.
         */
        if (p->flags & PF_EXITING)
                return;

        /*
         * We do not care about task placement until a task runs on a node
         * other than the first one used by the address space. This is
         * largely because migrations are driven by what CPU the task
         * is running on. If it's never scheduled on another node, it'll
         * not migrate so why bother trapping the fault.
         */
        if (mm->first_nid == NUMA_PTE_SCAN_INIT)
                mm->first_nid = numa_node_id();
        if (mm->first_nid != NUMA_PTE_SCAN_ACTIVE) {
                /* Are we running on a new node yet? */
                if (numa_node_id() == mm->first_nid &&
                    !sched_feat_numa(NUMA_FORCE))
                        return;

                mm->first_nid = NUMA_PTE_SCAN_ACTIVE;
        }

        /*
         * Reset the scan period if enough time has gone by. Objective is that
         * scanning will be reduced if pages are properly placed. As tasks
         * can enter different phases this needs to be re-examined. Lacking
         * proper tracking of reference behaviour, this blunt hammer is used.
         */
        migrate = mm->numa_next_reset;
        if (time_after(now, migrate)) {
                p->numa_scan_period = sysctl_numa_balancing_scan_period_min;
                next_scan = now + msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset);
                xchg(&mm->numa_next_reset, next_scan);
        }

        /*
         * Enforce maximal scan/migration frequency..
         */
        migrate = mm->numa_next_scan;
        if (time_before(now, migrate))
                return;

        if (p->numa_scan_period == 0)
                p->numa_scan_period = sysctl_numa_balancing_scan_period_min;

        next_scan = now + msecs_to_jiffies(p->numa_scan_period);
        if (cmpxchg(&mm->numa_next_scan, migrate, next_scan) != migrate)
                return;

        /*
         * Do not set pte_numa if the current running node is rate-limited.
         * This loses statistics on the fault but if we are unwilling to
         * migrate to this node, it is less likely we can do useful work
         */
        if (migrate_ratelimited(numa_node_id()))
                return;

        start = mm->numa_scan_offset;
        pages = sysctl_numa_balancing_scan_size;
        pages <<= 20 - PAGE_SHIFT; /* MB in pages */
        if (!pages)
                return;

        down_read(&mm->mmap_sem);
        vma = find_vma(mm, start);
        if (!vma) {
                reset_ptenuma_scan(p);
                start = 0;
                vma = mm->mmap;
        }
        for (; vma; vma = vma->vm_next) {
                if (!vma_migratable(vma))
                        continue;

                /* Skip small VMAs. They are not likely to be of relevance */
                if (vma->vm_end - vma->vm_start < HPAGE_SIZE)
                        continue;

                /*
                 * Skip inaccessible VMAs to avoid any confusion between
                 * PROT_NONE and NUMA hinting ptes
                 */
                if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
                        continue;

                do {
                        start = max(start, vma->vm_start);
                        end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);
                        end = min(end, vma->vm_end);
                        pages -= change_prot_numa(vma, start, end);

                        start = end;
                        if (pages <= 0)
                                goto out;
                } while (end != vma->vm_end);
        }

out:
        /*
         * It is possible to reach the end of the VMA list but the last few VMAs are
         * not guaranteed to the vma_migratable. If they are not, we would find the
         * !migratable VMA on the next scan but not reset the scanner to the start
         * so check it now.
         */
        if (vma)
                mm->numa_scan_offset = start;
        else
                reset_ptenuma_scan(p);
        up_read(&mm->mmap_sem);
}

/*
 * Drive the periodic memory faults..
 */
void task_tick_numa(struct rq *rq, struct task_struct *curr)
{
        struct callback_head *work = &curr->numa_work;
        u64 period, now;

        /*
         * We don't care about NUMA placement if we don't have memory.
         */
        if (!curr->mm || (curr->flags & PF_EXITING) || work->next != work)
                return;

        /*
         * Using runtime rather than walltime has the dual advantage that
         * we (mostly) drive the selection from busy threads and that the
         * task needs to have done some actual work before we bother with
         * NUMA placement.
         */
        now = curr->se.sum_exec_runtime;
        period = (u64)curr->numa_scan_period * NSEC_PER_MSEC;

        if (now - curr->node_stamp > period) {
                if (!curr->node_stamp)
                        curr->numa_scan_period = sysctl_numa_balancing_scan_period_min;
                curr->node_stamp = now;

                if (!time_before(jiffies, curr->mm->numa_next_scan)) {
                        init_task_work(work, task_numa_work); /* TODO: move this into sched_fork() */
                        task_work_add(curr, work, true);
                }
        }
}
#else
static void task_tick_numa(struct rq *rq, struct task_struct *curr)
{
}
#endif /* CONFIG_NUMA_BALANCING */

static void
account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        update_load_add(&cfs_rq->load, se->load.weight);
        if (!parent_entity(se))
                update_load_add(&rq_of(cfs_rq)->load, se->load.weight);
#ifdef CONFIG_SMP
        if (entity_is_task(se))
                list_add(&se->group_node, &rq_of(cfs_rq)->cfs_tasks);
#endif
        cfs_rq->nr_running++;
}

static void
account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        update_load_sub(&cfs_rq->load, se->load.weight);
        if (!parent_entity(se))
                update_load_sub(&rq_of(cfs_rq)->load, se->load.weight);
        if (entity_is_task(se))
                list_del_init(&se->group_node);
        cfs_rq->nr_running--;
}

#ifdef CONFIG_FAIR_GROUP_SCHED
# ifdef CONFIG_SMP
static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
{
        long tg_weight;

        /*
         * Use this CPU's actual weight instead of the last load_contribution
         * to gain a more accurate current total weight. See
         * update_cfs_rq_load_contribution().
         */
        tg_weight = atomic_long_read(&tg->load_avg);
        tg_weight -= cfs_rq->tg_load_contrib;
        tg_weight += cfs_rq->load.weight;

        return tg_weight;
}

static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
{
        long tg_weight, load, shares;

        tg_weight = calc_tg_weight(tg, cfs_rq);
        load = cfs_rq->load.weight;

        shares = (tg->shares * load);
        if (tg_weight)
                shares /= tg_weight;

        if (shares < MIN_SHARES)
                shares = MIN_SHARES;
        if (shares > tg->shares)
                shares = tg->shares;

        return shares;
}
# else /* CONFIG_SMP */
static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
{
        return tg->shares;
}
# endif /* CONFIG_SMP */
static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
                            unsigned long weight)
{
        if (se->on_rq) {
                /* commit outstanding execution time */
                if (cfs_rq->curr == se)
                        update_curr(cfs_rq);
                account_entity_dequeue(cfs_rq, se);
        }

        update_load_set(&se->load, weight);

        if (se->on_rq)
                account_entity_enqueue(cfs_rq, se);
}

static inline int throttled_hierarchy(struct cfs_rq *cfs_rq);

static void update_cfs_shares(struct cfs_rq *cfs_rq)
{
        struct task_group *tg;
        struct sched_entity *se;
        long shares;

        tg = cfs_rq->tg;
        se = tg->se[cpu_of(rq_of(cfs_rq))];
        if (!se || throttled_hierarchy(cfs_rq))
                return;
#ifndef CONFIG_SMP
        if (likely(se->load.weight == tg->shares))
                return;
#endif
        shares = calc_cfs_shares(cfs_rq, tg);

        reweight_entity(cfs_rq_of(se), se, shares);
}
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
{
}
#endif /* CONFIG_FAIR_GROUP_SCHED */

#ifdef CONFIG_SMP
/*
 * We choose a half-life close to 1 scheduling period.
 * Note: The tables below are dependent on this value.
 */
//#define LOAD_AVG_PERIOD 32
//#define LOAD_AVG_MAX 47742 /* maximum possible load avg */
//#define LOAD_AVG_MAX_N 345 /* number of full periods to produce LOAD_MAX_AVG */

/* Precomputed fixed inverse multiplies for multiplication by y^n */
static const u32 runnable_avg_yN_inv[] = {
        0xffffffff, 0xfa83b2da, 0xf5257d14, 0xefe4b99a, 0xeac0c6e6, 0xe5b906e6,
        0xe0ccdeeb, 0xdbfbb796, 0xd744fcc9, 0xd2a81d91, 0xce248c14, 0xc9b9bd85,
        0xc5672a10, 0xc12c4cc9, 0xbd08a39e, 0xb8fbaf46, 0xb504f333, 0xb123f581,
        0xad583ee9, 0xa9a15ab4, 0xa5fed6a9, 0xa2704302, 0x9ef5325f, 0x9b8d39b9,
        0x9837f050, 0x94f4efa8, 0x91c3d373, 0x8ea4398a, 0x8b95c1e3, 0x88980e80,
        0x85aac367, 0x82cd8698,
};

/*
 * Precomputed \Sum y^k { 1<=k<=n }.  These are floor(true_value) to prevent
 * over-estimates when re-combining.
 */
static const u32 runnable_avg_yN_sum[] = {
            0, 1002, 1982, 2941, 3880, 4798, 5697, 6576, 7437, 8279, 9103,
         9909,10698,11470,12226,12966,13690,14398,15091,15769,16433,17082,
        17718,18340,18949,19545,20128,20698,21256,21802,22336,22859,23371,
};

/*
 * Approximate:
 *   val * y^n,    where y^32 ~= 0.5 (~1 scheduling period)
 */
static __always_inline u64 decay_load(u64 val, u64 n)
{
        unsigned int local_n;

        if (!n)
                return val;
        else if (unlikely(n > LOAD_AVG_PERIOD * 63))
                return 0;

        /* after bounds checking we can collapse to 32-bit */
        local_n = n;

        /*
         * As y^PERIOD = 1/2, we can combine
         *    y^n = 1/2^(n/PERIOD) * k^(n%PERIOD)
         * With a look-up table which covers k^n (n<PERIOD)
         *
         * To achieve constant time decay_load.
         */
        if (unlikely(local_n >= LOAD_AVG_PERIOD)) {
                val >>= local_n / LOAD_AVG_PERIOD;
                local_n %= LOAD_AVG_PERIOD;
        }

        val *= runnable_avg_yN_inv[local_n];
        /* We don't use SRR here since we always want to round down. */
        return val >> 32;
}

/*
 * For updates fully spanning n periods, the contribution to runnable
 * average will be: \Sum 1024*y^n
 *
 * We can compute this reasonably efficiently by combining:
 *   y^PERIOD = 1/2 with precomputed \Sum 1024*y^n {for  n <PERIOD}
 */
static u32 __compute_runnable_contrib(u64 n)
{
        u32 contrib = 0;

        if (likely(n <= LOAD_AVG_PERIOD))
                return runnable_avg_yN_sum[n];
        else if (unlikely(n >= LOAD_AVG_MAX_N))
                return LOAD_AVG_MAX;

        /* Compute \Sum k^n combining precomputed values for k^i, \Sum k^j */
        do {
                contrib /= 2; /* y^LOAD_AVG_PERIOD = 1/2 */
                contrib += runnable_avg_yN_sum[LOAD_AVG_PERIOD];

                n -= LOAD_AVG_PERIOD;
        } while (n > LOAD_AVG_PERIOD);

        contrib = decay_load(contrib, n);
        return contrib + runnable_avg_yN_sum[n];
}

#ifdef CONFIG_HMP_VARIABLE_SCALE

#define HMP_VARIABLE_SCALE_SHIFT 16ULL
struct hmp_global_attr {
        struct attribute attr;
        ssize_t (*show)(struct kobject *kobj,
                        struct attribute *attr, char *buf);
        ssize_t (*store)(struct kobject *a, struct attribute *b,
                        const char *c, size_t count);
        int *value;
        int (*to_sysfs)(int);
        int (*from_sysfs)(int);
};

#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
#define HMP_DATA_SYSFS_MAX 5
#else
#define HMP_DATA_SYSFS_MAX 4
#endif

struct hmp_data_struct {
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        int freqinvar_load_scale_enabled;
#endif
        int multiplier; /* used to scale the time delta */
        struct attribute_group attr_group;
        struct attribute *attributes[HMP_DATA_SYSFS_MAX + 1];
        struct hmp_global_attr attr[HMP_DATA_SYSFS_MAX];
} hmp_data;

static u64 hmp_variable_scale_convert(u64 delta);
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
/* Frequency-Invariant Load Modification:
 * Loads are calculated as in PJT's patch however we also scale the current
 * contribution in line with the frequency of the CPU that the task was
 * executed on.
 * In this version, we use a simple linear scale derived from the maximum
 * frequency reported by CPUFreq. As an example:
 *
 * Consider that we ran a task for 100% of the previous interval.
 *
 * Our CPU was under asynchronous frequency control through one of the
 * CPUFreq governors.
 *
 * The CPUFreq governor reports that it is able to scale the CPU between
 * 500MHz and 1GHz.
 *
 * During the period, the CPU was running at 1GHz.
 *
 * In this case, our load contribution for that period is calculated as
 * 1 * (number_of_active_microseconds)
 *
 * This results in our task being able to accumulate maximum load as normal.
 *
 *
 * Consider now that our CPU was executing at 500MHz.
 *
 * We now scale the load contribution such that it is calculated as
 * 0.5 * (number_of_active_microseconds)
 *
 * Our task can only record 50% maximum load during this period.
 *
 * This represents the task consuming 50% of the CPU's *possible* compute
 * capacity. However the task did consume 100% of the CPU's *available*
 * compute capacity which is the value seen by the CPUFreq governor and
 * user-side CPU Utilization tools.
 *
 * Restricting tracked load to be scaled by the CPU's frequency accurately
 * represents the consumption of possible compute capacity and allows the
 * HMP migration's simple threshold migration strategy to interact more
 * predictably with CPUFreq's asynchronous compute capacity changes.
 */
#define SCHED_FREQSCALE_SHIFT 10
struct cpufreq_extents {
        u32 curr_scale;
        u32 min;
        u32 max;
        u32 flags;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        u32 const_max;
        u32 throttling;
#endif
};
/* Flag set when the governor in use only allows one frequency.
 * Disables scaling.
 */
#define SCHED_LOAD_FREQINVAR_SINGLEFREQ 0x01

static struct cpufreq_extents freq_scale[CONFIG_NR_CPUS];
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */
#endif /* CONFIG_HMP_VARIABLE_SCALE */

#ifdef CONFIG_MTK_SCHED_CMP
int get_cluster_id(unsigned int cpu)
{
        return arch_get_cluster_id(cpu);
}

void get_cluster_cpus(struct cpumask *cpus, int cluster_id,
                            bool exclusive_offline)
{
        struct cpumask cls_cpus;

        arch_get_cluster_cpus(&cls_cpus, cluster_id);
        if (exclusive_offline) {
                cpumask_and(cpus, cpu_online_mask, &cls_cpus);
        } else
                cpumask_copy(cpus, &cls_cpus);
}

static int nr_cpus_in_cluster(int cluster_id, bool exclusive_offline)
{
        struct cpumask cls_cpus;
        int nr_cpus;

        arch_get_cluster_cpus(&cls_cpus, cluster_id);
        if (exclusive_offline) {
                struct cpumask online_cpus;
                cpumask_and(&online_cpus, cpu_online_mask, &cls_cpus);
                nr_cpus = cpumask_weight(&online_cpus);
        } else
                nr_cpus = cpumask_weight(&cls_cpus);

        return nr_cpus;
}
#endif /* CONFIG_MTK_SCHED_CMP */

void sched_get_big_little_cpus(struct cpumask *big, struct cpumask *little)
{
        arch_get_big_little_cpus(big, little);
}
EXPORT_SYMBOL(sched_get_big_little_cpus);

/*
 * generic entry point for cpu mask construction, dedicated for
 * mediatek scheduler.
 */
static __init __inline void cmp_cputopo_domain_setup(void)
{
        WARN(smp_processor_id() != 0, "%s is supposed runs on CPU0 "
                                      "while kernel init", __func__);
#ifdef CONFIG_MTK_CPU_TOPOLOGY
        /*
         * sched_init
         *   |-> cmp_cputopo_domain_seutp()
         * ...
         * rest_init
         *   ^ fork kernel_init
         *       |-> kernel_init_freeable
         *        ...
         *           |-> arch_build_cpu_topology_domain
         *
         * here, we focus to build up cpu topology and domain before scheduler runs.
         */
        pr_debug("[CPUTOPO][%s] build CPU topology and cluster.\n", __func__);
        arch_build_cpu_topology_domain();
#endif
}

#ifdef CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY
static u64 __inline variable_scale_convert(u64 delta)
{
        u64 high = delta >> 32ULL;
        u64 low = delta & 0xffffffffULL;
        low *= LOAD_AVG_VARIABLE_PERIOD;
        high *= LOAD_AVG_VARIABLE_PERIOD;
        return (low >> 16ULL) + (high << (32ULL - 16ULL));
}
#endif

/* We can represent the historical contribution to runnable average as the
 * coefficients of a geometric series.  To do this we sub-divide our runnable
 * history into segments of approximately 1ms (1024us); label the segment that
 * occurred N-ms ago p_N, with p_0 corresponding to the current period, e.g.
 *
 * [<- 1024us ->|<- 1024us ->|<- 1024us ->| ...
 *      p0            p1           p2
 *     (now)       (~1ms ago)  (~2ms ago)
 *
 * Let u_i denote the fraction of p_i that the entity was runnable.
 *
 * We then designate the fractions u_i as our co-efficients, yielding the
 * following representation of historical load:
 *   u_0 + u_1*y + u_2*y^2 + u_3*y^3 + ...
 *
 * We choose y based on the with of a reasonably scheduling period, fixing:
 *   y^32 = 0.5
 *
 * This means that the contribution to load ~32ms ago (u_32) will be weighted
 * approximately half as much as the contribution to load within the last ms
 * (u_0).
 *
 * When a period "rolls over" and we have new u_0`, multiplying the previous
 * sum again by y is sufficient to update:
 *   load_avg = u_0` + y*(u_0 + u_1*y + u_2*y^2 + ... )
 *            = u_0 + u_1*y + u_2*y^2 + ... [re-labeling u_i --> u_{i+1}]
 */
static __always_inline int __update_entity_runnable_avg(u64 now,
                                                        struct sched_avg *sa,
                                                        int runnable,
                                                        int running,
                                                        int cpu)
{
        u64 delta, periods, lru;
        u32 runnable_contrib;
        int delta_w, decayed = 0;
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        u64 scaled_delta;
        u32 scaled_runnable_contrib;
        int scaled_delta_w;
        u32 curr_scale = 1024;
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        u64 scaled_delta;
        u32 scaled_runnable_contrib;
        int scaled_delta_w;
        u32 curr_scale = CPUPOWER_FREQSCALE_DEFAULT;
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */

        delta = now - sa->last_runnable_update;
        lru = sa->last_runnable_update;
        /*
         * This should only happen when time goes backwards, which it
         * unfortunately does during sched clock init when we swap over to TSC.
         */
        if ((s64)delta < 0) {
                sa->last_runnable_update = now;
                return 0;
        }

#ifdef CONFIG_HMP_VARIABLE_SCALE
        delta = hmp_variable_scale_convert(delta);
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        delta = variable_scale_convert(delta);
#endif
        /*
         * Use 1024ns as the unit of measurement since it's a reasonable
         * approximation of 1us and fast to compute.
         */
        delta >>= 10;
        if (!delta)
                return 0;
        sa->last_runnable_update = now;

#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        WARN(cpu < 0, "[%s] CPU %d < 0 !!!\n", __func__, cpu);
        /* retrieve scale factor for load */
        if (cpu >= 0 && cpu < nr_cpu_ids && hmp_data.freqinvar_load_scale_enabled)
                curr_scale = freq_scale[cpu].curr_scale;
        mt_sched_printf("[%s] cpu=%d delta=%llu now=%llu last=%llu curr_scale=%u",
                                        __func__, cpu, delta, now, lru, curr_scale);
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        WARN(cpu < 0, "[%s] CPU %d < 0 !!!\n", __func__, cpu);
        /* retrieve scale factor for load */
        if (cpu >= 0 && cpu < nr_cpu_ids)
                curr_scale = (topology_cpu_capacity(cpu) << CPUPOWER_FREQSCALE_SHIFT)
                        / (topology_max_cpu_capacity(cpu)+1);
        mt_sched_printf("[%s] cpu=%d delta=%llu now=%llu last=%llu curr_scale=%u",
                                        __func__, cpu, delta, now, lru, curr_scale);
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */

        /* delta_w is the amount already accumulated against our next period */
        delta_w = sa->runnable_avg_period % 1024;
        if (delta + delta_w >= 1024) {
                /* period roll-over */
                decayed = 1;

                /*
                 * Now that we know we're crossing a period boundary, figure
                 * out how much from delta we need to complete the current
                 * period and accrue it.
                 */
                delta_w = 1024 - delta_w;
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
                /* scale runnable time if necessary */
                scaled_delta_w = (delta_w * curr_scale)
                                >> SCHED_FREQSCALE_SHIFT;
                if (runnable)
                        sa->runnable_avg_sum += scaled_delta_w;
                if (running)
                        sa->usage_avg_sum += scaled_delta_w;
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
                /* scale runnable time if necessary */
                scaled_delta_w = (delta_w * curr_scale)
                                >> CPUPOWER_FREQSCALE_SHIFT;
                if (runnable)
                        sa->runnable_avg_sum += scaled_delta_w;
                if (running)
                        sa->usage_avg_sum += scaled_delta_w;
#else
                if (runnable)
                        sa->runnable_avg_sum += delta_w;
                if (running)
                        sa->usage_avg_sum += delta_w;
#endif /* #ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */
                sa->runnable_avg_period += delta_w;

                delta -= delta_w;

                /* Figure out how many additional periods this update spans */
                periods = delta / 1024;
                delta %= 1024;
                /* decay the load we have accumulated so far */
                sa->runnable_avg_sum = decay_load(sa->runnable_avg_sum,
                                                  periods + 1);
                sa->runnable_avg_period = decay_load(sa->runnable_avg_period,
                                                     periods + 1);
                sa->usage_avg_sum = decay_load(sa->usage_avg_sum, periods + 1);
                /* add the contribution from this period */
                /* Efficiently calculate \sum (1..n_period) 1024*y^i */
                runnable_contrib = __compute_runnable_contrib(periods);
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
                /* Apply load scaling if necessary.
                 * Note that multiplying the whole series is same as
                 * multiplying all terms
                 */
                scaled_runnable_contrib = (runnable_contrib * curr_scale)
                                >> SCHED_FREQSCALE_SHIFT;
                if (runnable)
                        sa->runnable_avg_sum += scaled_runnable_contrib;
                if (running)
                        sa->usage_avg_sum += scaled_runnable_contrib;
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
                /* Apply load scaling if necessary.
                 * Note that multiplying the whole series is same as
                 * multiplying all terms
                 */
                scaled_runnable_contrib = (runnable_contrib * curr_scale)
                                >> CPUPOWER_FREQSCALE_SHIFT;
                if (runnable)
                        sa->runnable_avg_sum += scaled_runnable_contrib;
                if (running)
                        sa->usage_avg_sum += scaled_runnable_contrib;
#else
                if (runnable)
                        sa->runnable_avg_sum += runnable_contrib;
                if (running)
                        sa->usage_avg_sum += runnable_contrib;
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */
                sa->runnable_avg_period += runnable_contrib;
        }

        /* Remainder of delta accrued against u_0` */
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        /* scale if necessary */
        scaled_delta = ((delta * curr_scale) >> SCHED_FREQSCALE_SHIFT);
        if (runnable)
                sa->runnable_avg_sum += scaled_delta;
        if (running)
                sa->usage_avg_sum += scaled_delta;
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        /* scale if necessary */
        scaled_delta = ((delta * curr_scale) >> CPUPOWER_FREQSCALE_SHIFT);
        if (runnable)
                sa->runnable_avg_sum += scaled_delta;
        if (running)
                sa->usage_avg_sum += scaled_delta;
#else
        if (runnable)
                sa->runnable_avg_sum += delta;
        if (running)
                sa->usage_avg_sum += delta;
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */
        sa->runnable_avg_period += delta;

        return decayed;
}

/* Synchronize an entity's decay with its parenting cfs_rq.*/
static inline u64 __synchronize_entity_decay(struct sched_entity *se)
{
        struct cfs_rq *cfs_rq = cfs_rq_of(se);
        u64 decays = atomic64_read(&cfs_rq->decay_counter);

        decays -= se->avg.decay_count;
        if (!decays)
                return 0;

        se->avg.load_avg_contrib = decay_load(se->avg.load_avg_contrib, decays);
        se->avg.decay_count = 0;

        return decays;
}

#ifdef CONFIG_FAIR_GROUP_SCHED
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
                                                 int force_update)
{
        struct task_group *tg = cfs_rq->tg;
        long tg_contrib;

        tg_contrib = cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
        tg_contrib -= cfs_rq->tg_load_contrib;

        if (force_update || abs(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
                atomic_long_add(tg_contrib, &tg->load_avg);
                cfs_rq->tg_load_contrib += tg_contrib;
        }
}

/*
 * Aggregate cfs_rq runnable averages into an equivalent task_group
 * representation for computing load contributions.
 */
static inline void __update_tg_runnable_avg(struct sched_avg *sa,
                                                  struct cfs_rq *cfs_rq)
{
        struct task_group *tg = cfs_rq->tg;
        long contrib, usage_contrib;

        /* The fraction of a cpu used by this cfs_rq */
        contrib = div_u64(sa->runnable_avg_sum << NICE_0_SHIFT,
                          sa->runnable_avg_period + 1);
        contrib -= cfs_rq->tg_runnable_contrib;

        usage_contrib = div_u64(sa->usage_avg_sum << NICE_0_SHIFT,
                                sa->runnable_avg_period + 1);
        usage_contrib -= cfs_rq->tg_usage_contrib;

        /*
         * contrib/usage at this point represent deltas, only update if they
         * are substantive.
         */
        if ((abs(contrib) > cfs_rq->tg_runnable_contrib / 64) ||
            (abs(usage_contrib) > cfs_rq->tg_usage_contrib / 64)) {
                atomic_add(contrib, &tg->runnable_avg);
                cfs_rq->tg_runnable_contrib += contrib;

                atomic_add(usage_contrib, &tg->usage_avg);
                cfs_rq->tg_usage_contrib += usage_contrib;
        }
}

static inline void __update_group_entity_contrib(struct sched_entity *se)
{
        struct cfs_rq *cfs_rq = group_cfs_rq(se);
        struct task_group *tg = cfs_rq->tg;
        int runnable_avg;

        u64 contrib;

        contrib = cfs_rq->tg_load_contrib * tg->shares;
        se->avg.load_avg_contrib = div_u64(contrib,
                                     atomic_long_read(&tg->load_avg) + 1);

        /*
         * For group entities we need to compute a correction term in the case
         * that they are consuming <1 cpu so that we would contribute the same
         * load as a task of equal weight.
         *
         * Explicitly co-ordinating this measurement would be expensive, but
         * fortunately the sum of each cpus contribution forms a usable
         * lower-bound on the true value.
         *
         * Consider the aggregate of 2 contributions.  Either they are disjoint
         * (and the sum represents true value) or they are disjoint and we are
         * understating by the aggregate of their overlap.
         *
         * Extending this to N cpus, for a given overlap, the maximum amount we
         * understand is then n_i(n_i+1)/2 * w_i where n_i is the number of
         * cpus that overlap for this interval and w_i is the interval width.
         *
         * On a small machine; the first term is well-bounded which bounds the
         * total error since w_i is a subset of the period.  Whereas on a
         * larger machine, while this first term can be larger, if w_i is the
         * of consequential size guaranteed to see n_i*w_i quickly converge to
         * our upper bound of 1-cpu.
         */
        runnable_avg = atomic_read(&tg->runnable_avg);
        if (runnable_avg < NICE_0_LOAD) {
                se->avg.load_avg_contrib *= runnable_avg;
                se->avg.load_avg_contrib >>= NICE_0_SHIFT;
        }
}
#else
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
                                                   int force_update) {}
static inline void __update_tg_runnable_avg(struct sched_avg *sa,
                                            struct cfs_rq *cfs_rq) {}
static inline void __update_group_entity_contrib(struct sched_entity *se) {}
#endif

static inline void __update_task_entity_contrib(struct sched_entity *se)
{
        u32 contrib;

        /* avoid overflowing a 32-bit type w/ SCHED_LOAD_SCALE */
        contrib = se->avg.runnable_avg_sum * scale_load_down(se->load.weight);
        contrib /= (se->avg.runnable_avg_period + 1);
        se->avg.load_avg_contrib = scale_load(contrib);
}

/* Compute the current contribution to load_avg by se, return any delta */
static long __update_entity_load_avg_contrib(struct sched_entity *se)
{
        long old_contrib = se->avg.load_avg_contrib;

        if (entity_is_task(se)) {
                __update_task_entity_contrib(se);
        } else {
                __update_tg_runnable_avg(&se->avg, group_cfs_rq(se));
                __update_group_entity_contrib(se);
        }

        return se->avg.load_avg_contrib - old_contrib;
}

#if defined(CONFIG_MTK_SCHED_CMP) || defined(CONFIG_SCHED_HMP_ENHANCEMENT)
/* usage_avg_sum & load_avg_ratio are based on Linaro 12.11. */
static long __update_task_entity_ratio(struct sched_entity *se)
{
        long old_ratio = se->avg.load_avg_ratio;
        u32 ratio;

        ratio = se->avg.runnable_avg_sum * scale_load_down(NICE_0_LOAD);
        ratio /= (se->avg.runnable_avg_period + 1);
        se->avg.load_avg_ratio = scale_load(ratio);

        return se->avg.load_avg_ratio - old_ratio;
}
#else
static inline long __update_task_entity_ratio(struct sched_entity *se) { return 0; }
#endif

static inline void subtract_blocked_load_contrib(struct cfs_rq *cfs_rq,
                                                 long load_contrib)
{
        if (likely(load_contrib < cfs_rq->blocked_load_avg))
                cfs_rq->blocked_load_avg -= load_contrib;
        else
                cfs_rq->blocked_load_avg = 0;
}

#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
unsigned int hmp_up_prio = NICE_TO_PRIO(CONFIG_SCHED_HMP_PRIO_FILTER_VAL);
#endif

#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
/* Schedule entity */
#define se_pid(se) ((se != NULL && entity_is_task(se))? \
                        container_of(se,struct task_struct,se)->pid:-1)
#define se_load(se) se->avg.load_avg_ratio
#define se_contrib(se) se->avg.load_avg_contrib

/* CPU related : load information */
#define cfs_pending_load(cpu) cpu_rq(cpu)->cfs.avg.pending_load
#define cfs_load(cpu) cpu_rq(cpu)->cfs.avg.load_avg_ratio
#define cfs_contrib(cpu) cpu_rq(cpu)->cfs.avg.load_avg_contrib

/* CPU related : the number of tasks */
#define cfs_nr_normal_prio(cpu) cpu_rq(cpu)->cfs.avg.nr_normal_prio
#define cfs_nr_pending(cpu) cpu_rq(cpu)->cfs.avg.nr_pending
#define cfs_length(cpu) cpu_rq(cpu)->cfs.h_nr_running
#define rq_length(cpu) (cpu_rq(cpu)->nr_running + cfs_nr_pending(cpu))

#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
#define task_low_priority(prio) ((prio >= hmp_up_prio)?1:0)
#define cfs_nr_dequeuing_low_prio(cpu) \
                        cpu_rq(cpu)->cfs.avg.nr_dequeuing_low_prio
#define cfs_reset_nr_dequeuing_low_prio(cpu) \
                        (cfs_nr_dequeuing_low_prio(cpu) = 0)
#else
#define task_low_priority(prio) (0)
#define cfs_reset_nr_dequeuing_low_prio(cpu)
#endif /* CONFIG_SCHED_HMP_PRIO_FILTER */
#endif /* CONFIG_SCHED_HMP_ENHANCEMENT */

static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq);

#ifdef CONFIG_MTK_SCHED_CMP_TGS
int group_leader_is_empty(struct task_struct *p) {

        struct task_struct *tg = p->group_leader;

        if (SIGNAL_GROUP_EXIT & p->signal->flags){
        //      pr_warn("[%s] (0x%p/0x%p)(#%d/%s) leader: pid(%d) state(%d) exit_state(%d)signal_flags=%x p->signal->flags=%x group_exit_code=%x\n", __func__,
        //      p, tg, get_nr_threads(p), thread_group_empty(p) ? "empty" : "not empty",
        //      p->tgid, tg->state, tg->exit_state, tg->state, p->signal->flags, p->signal->group_exit_code);
                return 1;
        }

        // workaround debug codes
        if(tg->state == 0x6b6b6b6b){
        //      pr_warn("[%s] (0x%p/0x%p)(#%d/%s) leader: state(%d) exit_state(%d)\n", __func__,
        //      p, tg, get_nr_threads(p), thread_group_empty(p) ? "empty" : "not empty",
        //      tg->state, tg->exit_state);
                return 1;
        }

        return 0;
}

static inline void update_tg_info(struct cfs_rq *cfs_rq, struct sched_entity *se, long ratio_delta)
{
        struct task_struct *p = task_of(se);
        struct task_struct *tg = p->group_leader;
        int id;
        unsigned long flags;

        if (group_leader_is_empty(p))
                return;
        id = get_cluster_id(cfs_rq->rq->cpu);
        if (unlikely(WARN_ON(id < 0)))
                return;

        raw_spin_lock_irqsave(&tg->thread_group_info_lock, flags);
        tg->thread_group_info[id].load_avg_ratio += ratio_delta;
        raw_spin_unlock_irqrestore(&tg->thread_group_info_lock, flags);

#ifdef CONFIG_MT_SCHED_INFO
        mt_sched_printf("update_tg_info %d:%s %d:%s %ld %ld %d %d %lu:%lu:%lu update",
           tg->pid, tg->comm, p->pid, p->comm, 
           se->avg.load_avg_ratio, ratio_delta,
           cfs_rq->rq->cpu, id,
           tg->thread_group_info[id].nr_running,
           tg->thread_group_info[id].cfs_nr_running,
           tg->thread_group_info[id].load_avg_ratio);
/*
        mt_sched_printf("update %d:%s %d:%s %ld %ld %d %d %lu %lu %lu, %lu %lu %lu",
           tg->pid, tg->comm, p->pid, p->comm,
           se->avg.load_avg_ratio, ratio_delta,
           id, cfs_rq->rq->cpu,
           tg->thread_group_info[0].nr_running,
           tg->thread_group_info[0].cfs_nr_running,
           tg->thread_group_info[0].load_avg_ratio,
           tg->thread_group_info[1].nr_running,
           tg->thread_group_info[1].cfs_nr_running,
           tg->thread_group_info[1].load_avg_ratio);
*/
#endif

}
#endif 

/* Update a sched_entity's runnable average */
static inline void update_entity_load_avg(struct sched_entity *se,
                                          int update_cfs_rq)
{
        struct cfs_rq *cfs_rq = cfs_rq_of(se);
        long contrib_delta;
        u64 now;
        long ratio_delta = 0;
        int cpu = -1;   /* not used in normal case */

#if defined(CONFIG_HMP_FREQUENCY_INVARIANT_SCALE)                       \
        || defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        cpu = cfs_rq->rq->cpu;
#endif

        /*
         * For a group entity we need to use their owned cfs_rq_clock_task() in
         * case they are the parent of a throttled hierarchy.
         */
        if (entity_is_task(se))
                now = cfs_rq_clock_task(cfs_rq);
        else
                now = cfs_rq_clock_task(group_cfs_rq(se));

        if (!__update_entity_runnable_avg(now, &se->avg, se->on_rq,
                                   cfs_rq->curr == se, cpu)) {
#if 0
                if (entity_is_task(se)) {
                        ratio_delta = __update_task_entity_ratio(se);
                        if (update_cfs_rq)
                        {
                                cpu = cfs_rq->rq->cpu;
                                cpu_rq(cpu)->cfs.avg.load_avg_ratio += ratio_delta;
#ifdef CONFIG_HMP_TRACER
                                trace_sched_cfs_load_update(task_of(se),se_load(se),ratio_delta, cpu);
#endif /* CONFIG_HMP_TRACER */
                        }

                        trace_sched_task_entity_avg(2, task_of(se), &se->avg);
#ifdef CONFIG_MTK_SCHED_CMP_TGS
                        if (se->on_rq) {
                                update_tg_info(cfs_rq, se, ratio_delta);
                        }
#endif
                }
#endif
                return;
        }

        contrib_delta = __update_entity_load_avg_contrib(se);

        /* usage_avg_sum & load_avg_ratio are based on Linaro 12.11. */
        if (entity_is_task(se)) {
                ratio_delta = __update_task_entity_ratio(se);
                /*
                 * ratio is re-estimated just for entity of task; as 
                 * for contrib, mark tracer here for task entity while
                 * mining tg's at __update_group_entity_contrib().
                 *
                 * track running usage in passing.
                 */
                trace_sched_task_entity_avg(3, task_of(se), &se->avg);
        }

        if (!update_cfs_rq)
                return;

        if (se->on_rq) {
                cfs_rq->runnable_load_avg += contrib_delta;
                if (entity_is_task(se)) {
                        cpu = cfs_rq->rq->cpu;
                        cpu_rq(cpu)->cfs.avg.load_avg_ratio += ratio_delta;
                        cpu_rq(cpu)->cfs.avg.load_avg_contrib += contrib_delta;
#ifdef CONFIG_HMP_TRACER
                        trace_sched_cfs_load_update(task_of(se),se_load(se),ratio_delta,cpu);
#endif /* CONFIG_HMP_TRACER */
#ifdef CONFIG_MTK_SCHED_CMP_TGS
                        update_tg_info(cfs_rq, se, ratio_delta);
#endif
                }
        }
        else
                subtract_blocked_load_contrib(cfs_rq, -contrib_delta);
}


/*
 * Decay the load contributed by all blocked children and account this so that
 * their contribution may appropriately discounted when they wake up.
 */
static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
{
        u64 now = cfs_rq_clock_task(cfs_rq) >> 20;
        u64 decays;

        decays = now - cfs_rq->last_decay;
        if (!decays && !force_update)
                return;

        if (atomic_long_read(&cfs_rq->removed_load)) {
                unsigned long removed_load;
                removed_load = atomic_long_xchg(&cfs_rq->removed_load, 0);
                subtract_blocked_load_contrib(cfs_rq, removed_load);
        }

        if (decays) {
                cfs_rq->blocked_load_avg = decay_load(cfs_rq->blocked_load_avg,
                                                      decays);
                atomic64_add(decays, &cfs_rq->decay_counter);
                cfs_rq->last_decay = now;
        }

        __update_cfs_rq_tg_load_contrib(cfs_rq, force_update);
}

static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
{
        u32 contrib;
        int cpu = -1;   /* not used in normal case */

#if defined(CONFIG_HMP_FREQUENCY_INVARIANT_SCALE)                       \
        || defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        cpu = rq->cpu;
#endif
        __update_entity_runnable_avg(rq->clock_task, &rq->avg, runnable,
                              runnable, cpu);
        __update_tg_runnable_avg(&rq->avg, &rq->cfs);
        contrib = rq->avg.runnable_avg_sum * scale_load_down(1024);
        contrib /= (rq->avg.runnable_avg_period + 1);
        trace_sched_rq_runnable_ratio(cpu_of(rq), scale_load(contrib));
        trace_sched_rq_runnable_load(cpu_of(rq), rq->cfs.runnable_load_avg);
}

/* Add the load generated by se into cfs_rq's child load-average */
static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
                                                  struct sched_entity *se,
                                                  int wakeup)
{
        int cpu = cfs_rq->rq->cpu;

        /*
         * We track migrations using entity decay_count <= 0, on a wake-up
         * migration we use a negative decay count to track the remote decays
         * accumulated while sleeping.
         *
         * Newly forked tasks are enqueued with se->avg.decay_count == 0, they
         * are seen by enqueue_entity_load_avg() as a migration with an already
         * constructed load_avg_contrib.
         */
        if (unlikely(se->avg.decay_count <= 0)) {
                se->avg.last_runnable_update = rq_of(cfs_rq)->clock_task;
                if (se->avg.decay_count) {
                        /*
                         * In a wake-up migration we have to approximate the
                         * time sleeping.  This is because we can't synchronize
                         * clock_task between the two cpus, and it is not
                         * guaranteed to be read-safe.  Instead, we can
                         * approximate this using our carried decays, which are
                         * explicitly atomically readable.
                         */
                        se->avg.last_runnable_update -= (-se->avg.decay_count)
                                                        << 20;
                        update_entity_load_avg(se, 0);
                        /* Indicate that we're now synchronized and on-rq */
                        se->avg.decay_count = 0;
#ifdef CONFIG_MTK_SCHED_CMP 
                } else {
                        if (entity_is_task(se))
                                trace_sched_task_entity_avg(1, task_of(se), &se->avg);
#endif
                }
                wakeup = 0;
        } else {
                __synchronize_entity_decay(se);
        }

        /* migrated tasks did not contribute to our blocked load */
        if (wakeup) {
                subtract_blocked_load_contrib(cfs_rq, se->avg.load_avg_contrib);
                update_entity_load_avg(se, 0);
        }

        cfs_rq->runnable_load_avg += se->avg.load_avg_contrib;
#ifdef CONFIG_MTK_SCHED_CMP_TGS
        if(entity_is_task(se)){
                update_tg_info(cfs_rq, se, se->avg.load_avg_ratio);
        }       
#endif

        if (entity_is_task(se)) {
                cpu_rq(cpu)->cfs.avg.load_avg_contrib += se->avg.load_avg_contrib;
                cpu_rq(cpu)->cfs.avg.load_avg_ratio += se->avg.load_avg_ratio;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
                cfs_nr_pending(cpu) = 0;
                cfs_pending_load(cpu) = 0;
#endif
#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
                if(!task_low_priority(task_of(se)->prio))
                        cfs_nr_normal_prio(cpu)++;
#endif
#ifdef CONFIG_HMP_TRACER
                trace_sched_cfs_enqueue_task(task_of(se),se_load(se),cpu);
#endif
        }

        /* we force update consideration on load-balancer moves */
        update_cfs_rq_blocked_load(cfs_rq, !wakeup);
}

/*
 * Remove se's load from this cfs_rq child load-average, if the entity is
 * transitioning to a blocked state we track its projected decay using
 * blocked_load_avg.
 */
static inline void dequeue_entity_load_avg(struct cfs_rq *cfs_rq,
                                                  struct sched_entity *se,
                                                  int sleep)
{
        int cpu = cfs_rq->rq->cpu;

        update_entity_load_avg(se, 1);
        /* we force update consideration on load-balancer moves */
        update_cfs_rq_blocked_load(cfs_rq, !sleep);

        cfs_rq->runnable_load_avg -= se->avg.load_avg_contrib;
#ifdef CONFIG_MTK_SCHED_CMP_TGS
        if(entity_is_task(se)){
                update_tg_info(cfs_rq, se, -se->avg.load_avg_ratio);
        }       
#endif

        if (entity_is_task(se)) {
                cpu_rq(cpu)->cfs.avg.load_avg_contrib -= se->avg.load_avg_contrib;
                cpu_rq(cpu)->cfs.avg.load_avg_ratio -= se->avg.load_avg_ratio;
#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
                cfs_reset_nr_dequeuing_low_prio(cpu);
                if(!task_low_priority(task_of(se)->prio))
                        cfs_nr_normal_prio(cpu)--;
#endif
#ifdef CONFIG_HMP_TRACER
                trace_sched_cfs_dequeue_task(task_of(se),se_load(se),cpu);
#endif
        }

        if (sleep) {
                cfs_rq->blocked_load_avg += se->avg.load_avg_contrib;
                se->avg.decay_count = atomic64_read(&cfs_rq->decay_counter);
        } /* migrations, e.g. sleep=0 leave decay_count == 0 */
}

/*
 * Update the rq's load with the elapsed running time before entering
 * idle. if the last scheduled task is not a CFS task, idle_enter will
 * be the only way to update the runnable statistic.
 */
void idle_enter_fair(struct rq *this_rq)
{
        update_rq_runnable_avg(this_rq, 1);
}

/*
 * Update the rq's load with the elapsed idle time before a task is
 * scheduled. if the newly scheduled task is not a CFS task, idle_exit will
 * be the only way to update the runnable statistic.
 */
void idle_exit_fair(struct rq *this_rq)
{
        update_rq_runnable_avg(this_rq, 0);
}

#else
static inline void update_entity_load_avg(struct sched_entity *se,
                                          int update_cfs_rq) {}
static inline void update_rq_runnable_avg(struct rq *rq, int runnable) {}
static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
                                           struct sched_entity *se,
                                           int wakeup) {}
static inline void dequeue_entity_load_avg(struct cfs_rq *cfs_rq,
                                           struct sched_entity *se,
                                           int sleep) {}
static inline void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq,
                                              int force_update) {}
#endif

static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
#ifdef CONFIG_SCHEDSTATS
        struct task_struct *tsk = NULL;

        if (entity_is_task(se))
                tsk = task_of(se);

        if (se->statistics.sleep_start) {
                u64 delta = rq_of(cfs_rq)->clock - se->statistics.sleep_start;

                if ((s64)delta < 0)
                        delta = 0;

                if (unlikely(delta > se->statistics.sleep_max))
                        se->statistics.sleep_max = delta;

                se->statistics.sleep_start = 0;
                se->statistics.sum_sleep_runtime += delta;

                if (tsk) {
                        account_scheduler_latency(tsk, delta >> 10, 1);
                        trace_sched_stat_sleep(tsk, delta);
                }
        }
        if (se->statistics.block_start) {
                u64 delta = rq_of(cfs_rq)->clock - se->statistics.block_start;

                if ((s64)delta < 0)
                        delta = 0;

                if (unlikely(delta > se->statistics.block_max))
                        se->statistics.block_max = delta;

                se->statistics.block_start = 0;
                se->statistics.sum_sleep_runtime += delta;

                if (tsk) {
                        if (tsk->in_iowait) {
                                se->statistics.iowait_sum += delta;
                                se->statistics.iowait_count++;
                                trace_sched_stat_iowait(tsk, delta);
                        }

                        trace_sched_stat_blocked(tsk, delta);

                        /*
                         * Blocking time is in units of nanosecs, so shift by
                         * 20 to get a milliseconds-range estimation of the
                         * amount of time that the task spent sleeping:
                         */
                        if (unlikely(prof_on == SLEEP_PROFILING)) {
                                profile_hits(SLEEP_PROFILING,
                                                (void *)get_wchan(tsk),
                                                delta >> 20);
                        }
                        account_scheduler_latency(tsk, delta >> 10, 0);
                }
        }
#endif
}

static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
#ifdef CONFIG_SCHED_DEBUG
        s64 d = se->vruntime - cfs_rq->min_vruntime;

        if (d < 0)
                d = -d;

        if (d > 3*sysctl_sched_latency)
                schedstat_inc(cfs_rq, nr_spread_over);
#endif
}

static void
place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
{
        u64 vruntime = cfs_rq->min_vruntime;

        /*
         * The 'current' period is already promised to the current tasks,
         * however the extra weight of the new task will slow them down a
         * little, place the new task so that it fits in the slot that
         * stays open at the end.
         */
        if (initial && sched_feat(START_DEBIT))
                vruntime += sched_vslice(cfs_rq, se);

        /* sleeps up to a single latency don't count. */
        if (!initial) {
                unsigned long thresh = sysctl_sched_latency;

                /*
                 * Halve their sleep time's effect, to allow
                 * for a gentler effect of sleepers:
                 */
                if (sched_feat(GENTLE_FAIR_SLEEPERS))
                        thresh >>= 1;

                vruntime -= thresh;
        }

        /* ensure we never gain time by being placed backwards. */
        se->vruntime = max_vruntime(se->vruntime, vruntime);
}

static void check_enqueue_throttle(struct cfs_rq *cfs_rq);

static void
enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
        /*
         * Update the normalized vruntime before updating min_vruntime
         * through calling update_curr().
         */
        if (!(flags & ENQUEUE_WAKEUP) || (flags & ENQUEUE_WAKING))
                se->vruntime += cfs_rq->min_vruntime;

        /*
         * Update run-time statistics of the 'current'.
         */
        update_curr(cfs_rq);
        enqueue_entity_load_avg(cfs_rq, se, flags & ENQUEUE_WAKEUP);
        account_entity_enqueue(cfs_rq, se);
        update_cfs_shares(cfs_rq);

        if (flags & ENQUEUE_WAKEUP) {
                place_entity(cfs_rq, se, 0);
                enqueue_sleeper(cfs_rq, se);
        }

        update_stats_enqueue(cfs_rq, se);
        check_spread(cfs_rq, se);
        if (se != cfs_rq->curr)
                __enqueue_entity(cfs_rq, se);
        se->on_rq = 1;

        if (cfs_rq->nr_running == 1) {
                list_add_leaf_cfs_rq(cfs_rq);
                check_enqueue_throttle(cfs_rq);
        }
}

static void __clear_buddies_last(struct sched_entity *se)
{
        for_each_sched_entity(se) {
                struct cfs_rq *cfs_rq = cfs_rq_of(se);
                if (cfs_rq->last == se)
                        cfs_rq->last = NULL;
                else
                        break;
        }
}

static void __clear_buddies_next(struct sched_entity *se)
{
        for_each_sched_entity(se) {
                struct cfs_rq *cfs_rq = cfs_rq_of(se);
                if (cfs_rq->next == se)
                        cfs_rq->next = NULL;
                else
                        break;
        }
}

static void __clear_buddies_skip(struct sched_entity *se)
{
        for_each_sched_entity(se) {
                struct cfs_rq *cfs_rq = cfs_rq_of(se);
                if (cfs_rq->skip == se)
                        cfs_rq->skip = NULL;
                else
                        break;
        }
}

static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        if (cfs_rq->last == se)
                __clear_buddies_last(se);

        if (cfs_rq->next == se)
                __clear_buddies_next(se);

        if (cfs_rq->skip == se)
                __clear_buddies_skip(se);
}

static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq);

static void
dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
        /*
         * Update run-time statistics of the 'current'.
         */
        update_curr(cfs_rq);
        dequeue_entity_load_avg(cfs_rq, se, flags & DEQUEUE_SLEEP);

        update_stats_dequeue(cfs_rq, se);
        if (flags & DEQUEUE_SLEEP) {
#ifdef CONFIG_SCHEDSTATS
                if (entity_is_task(se)) {
                        struct task_struct *tsk = task_of(se);

                        if (tsk->state & TASK_INTERRUPTIBLE)
                                se->statistics.sleep_start = rq_of(cfs_rq)->clock;
                        if (tsk->state & TASK_UNINTERRUPTIBLE)
                                se->statistics.block_start = rq_of(cfs_rq)->clock;
                }
#endif
        }

        clear_buddies(cfs_rq, se);

        if (se != cfs_rq->curr)
                __dequeue_entity(cfs_rq, se);
        se->on_rq = 0;
        account_entity_dequeue(cfs_rq, se);

        /*
         * Normalize the entity after updating the min_vruntime because the
         * update can refer to the ->curr item and we need to reflect this
         * movement in our normalized position.
         */
        if (!(flags & DEQUEUE_SLEEP))
                se->vruntime -= cfs_rq->min_vruntime;

        /* return excess runtime on last dequeue */
        return_cfs_rq_runtime(cfs_rq);

        update_min_vruntime(cfs_rq);
        update_cfs_shares(cfs_rq);
}

/*
 * Preempt the current task with a newly woken task if needed:
 */
static void
check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
{
        unsigned long ideal_runtime, delta_exec;
        struct sched_entity *se;
        s64 delta;

        ideal_runtime = sched_slice(cfs_rq, curr);
        delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
        if (delta_exec > ideal_runtime) {
                resched_task(rq_of(cfs_rq)->curr);
                /*
                 * The current task ran long enough, ensure it doesn't get
                 * re-elected due to buddy favours.
                 */
                clear_buddies(cfs_rq, curr);
                return;
        }

        /*
         * Ensure that a task that missed wakeup preemption by a
         * narrow margin doesn't have to wait for a full slice.
         * This also mitigates buddy induced latencies under load.
         */
        if (delta_exec < sysctl_sched_min_granularity)
                return;

        se = __pick_first_entity(cfs_rq);
        delta = curr->vruntime - se->vruntime;

        if (delta < 0)
                return;

        if (delta > ideal_runtime)
                resched_task(rq_of(cfs_rq)->curr);
}

static void
set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
        /* 'current' is not kept within the tree. */
        if (se->on_rq) {
                /*
                 * Any task has to be enqueued before it get to execute on
                 * a CPU. So account for the time it spent waiting on the
                 * runqueue.
                 */
                update_stats_wait_end(cfs_rq, se);
                __dequeue_entity(cfs_rq, se);
                update_entity_load_avg(se, 1);
        }

        update_stats_curr_start(cfs_rq, se);
        cfs_rq->curr = se;
#ifdef CONFIG_SCHEDSTATS
        /*
         * Track our maximum slice length, if the CPU's load is at
         * least twice that of our own weight (i.e. dont track it
         * when there are only lesser-weight tasks around):
         */
        if (rq_of(cfs_rq)->load.weight >= 2*se->load.weight) {
                se->statistics.slice_max = max(se->statistics.slice_max,
                        se->sum_exec_runtime - se->prev_sum_exec_runtime);
        }
#endif
        se->prev_sum_exec_runtime = se->sum_exec_runtime;
}

static int
wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se);

/*
 * Pick the next process, keeping these things in mind, in this order:
 * 1) keep things fair between processes/task groups
 * 2) pick the "next" process, since someone really wants that to run
 * 3) pick the "last" process, for cache locality
 * 4) do not run the "skip" process, if something else is available
 */
static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)
{
        struct sched_entity *se = __pick_first_entity(cfs_rq);
        struct sched_entity *left = se;

        /*
         * Avoid running the skip buddy, if running something else can
         * be done without getting too unfair.
         */
        if (cfs_rq->skip == se) {
                struct sched_entity *second = __pick_next_entity(se);
                if (second && wakeup_preempt_entity(second, left) < 1)
                        se = second;
        }

        /*
         * Prefer last buddy, try to return the CPU to a preempted task.
         */
        if (cfs_rq->last && wakeup_preempt_entity(cfs_rq->last, left) < 1)
                se = cfs_rq->last;

        /*
         * Someone really wants this to run. If it's not unfair, run it.
         */
        if (cfs_rq->next && wakeup_preempt_entity(cfs_rq->next, left) < 1)
                se = cfs_rq->next;

        clear_buddies(cfs_rq, se);

        return se;
}

static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq);

static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
{
        /*
         * If still on the runqueue then deactivate_task()
         * was not called and update_curr() has to be done:
         */
        if (prev->on_rq)
                update_curr(cfs_rq);

        /* throttle cfs_rqs exceeding runtime */
        check_cfs_rq_runtime(cfs_rq);

        check_spread(cfs_rq, prev);
        if (prev->on_rq) {
                update_stats_wait_start(cfs_rq, prev);
                /* Put 'current' back into the tree. */
                __enqueue_entity(cfs_rq, prev);
                /* in !on_rq case, update occurred at dequeue */
                update_entity_load_avg(prev, 1);
        }
        cfs_rq->curr = NULL;
}

static void
entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
{
        /*
         * Update run-time statistics of the 'current'.
         */
        update_curr(cfs_rq);

        /*
         * Ensure that runnable average is periodically updated.
         */
        update_entity_load_avg(curr, 1);
        update_cfs_rq_blocked_load(cfs_rq, 1);
        update_cfs_shares(cfs_rq);

#ifdef CONFIG_SCHED_HRTICK
        /*
         * queued ticks are scheduled to match the slice, so don't bother
         * validating it and just reschedule.
         */
        if (queued) {
                resched_task(rq_of(cfs_rq)->curr);
                return;
        }
        /*
         * don't let the period tick interfere with the hrtick preemption
         */
        if (!sched_feat(DOUBLE_TICK) &&
                        hrtimer_active(&rq_of(cfs_rq)->hrtick_timer))
                return;
#endif

        if (cfs_rq->nr_running > 1)
                check_preempt_tick(cfs_rq, curr);
}


/**************************************************
 * CFS bandwidth control machinery
 */

#ifdef CONFIG_CFS_BANDWIDTH

#ifdef HAVE_JUMP_LABEL
static struct static_key __cfs_bandwidth_used;

static inline bool cfs_bandwidth_used(void)
{
        return static_key_false(&__cfs_bandwidth_used);
}

void cfs_bandwidth_usage_inc(void)
{
        static_key_slow_inc(&__cfs_bandwidth_used);
}

void cfs_bandwidth_usage_dec(void)
{
        static_key_slow_dec(&__cfs_bandwidth_used);
}
#else /* HAVE_JUMP_LABEL */
static bool cfs_bandwidth_used(void)
{
        return true;
}

void cfs_bandwidth_usage_inc(void) {}
void cfs_bandwidth_usage_dec(void) {}
#endif /* HAVE_JUMP_LABEL */

/*
 * default period for cfs group bandwidth.
 * default: 0.1s, units: nanoseconds
 */
static inline u64 default_cfs_period(void)
{
        return 100000000ULL;
}

static inline u64 sched_cfs_bandwidth_slice(void)
{
        return (u64)sysctl_sched_cfs_bandwidth_slice * NSEC_PER_USEC;
}

/*
 * Replenish runtime according to assigned quota and update expiration time.
 * We use sched_clock_cpu directly instead of rq->clock to avoid adding
 * additional synchronization around rq->lock.
 *
 * requires cfs_b->lock
 */
void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
{
        u64 now;

        if (cfs_b->quota == RUNTIME_INF)
                return;

        now = sched_clock_cpu(smp_processor_id());
        cfs_b->runtime = cfs_b->quota;
        cfs_b->runtime_expires = now + ktime_to_ns(cfs_b->period);
}

static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
{
        return &tg->cfs_bandwidth;
}

/* rq->task_clock normalized against any time this cfs_rq has spent throttled */
static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
{
        if (unlikely(cfs_rq->throttle_count))
                return cfs_rq->throttled_clock_task;

        return rq_of(cfs_rq)->clock_task - cfs_rq->throttled_clock_task_time;
}

/* returns 0 on failure to allocate runtime */
static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        struct task_group *tg = cfs_rq->tg;
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
        u64 amount = 0, min_amount, expires;

        /* note: this is a positive sum as runtime_remaining <= 0 */
        min_amount = sched_cfs_bandwidth_slice() - cfs_rq->runtime_remaining;

        raw_spin_lock(&cfs_b->lock);
        if (cfs_b->quota == RUNTIME_INF)
                amount = min_amount;
        else {
                /*
                 * If the bandwidth pool has become inactive, then at least one
                 * period must have elapsed since the last consumption.
                 * Refresh the global state and ensure bandwidth timer becomes
                 * active.
                 */
                if (!cfs_b->timer_active) {
                        __refill_cfs_bandwidth_runtime(cfs_b);
                        __start_cfs_bandwidth(cfs_b);
                }

                if (cfs_b->runtime > 0) {
                        amount = min(cfs_b->runtime, min_amount);
                        cfs_b->runtime -= amount;
                        cfs_b->idle = 0;
                }
        }
        expires = cfs_b->runtime_expires;
        raw_spin_unlock(&cfs_b->lock);

        cfs_rq->runtime_remaining += amount;
        /*
         * we may have advanced our local expiration to account for allowed
         * spread between our sched_clock and the one on which runtime was
         * issued.
         */
        if ((s64)(expires - cfs_rq->runtime_expires) > 0)
                cfs_rq->runtime_expires = expires;

        return cfs_rq->runtime_remaining > 0;
}

/*
 * Note: This depends on the synchronization provided by sched_clock and the
 * fact that rq->clock snapshots this value.
 */
static void expire_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
        struct rq *rq = rq_of(cfs_rq);

        /* if the deadline is ahead of our clock, nothing to do */
        if (likely((s64)(rq->clock - cfs_rq->runtime_expires) < 0))
                return;

        if (cfs_rq->runtime_remaining < 0)
                return;

        /*
         * If the local deadline has passed we have to consider the
         * possibility that our sched_clock is 'fast' and the global deadline
         * has not truly expired.
         *
         * Fortunately we can check determine whether this the case by checking
         * whether the global deadline has advanced.
         */

        if ((s64)(cfs_rq->runtime_expires - cfs_b->runtime_expires) >= 0) {
                /* extend local deadline, drift is bounded above by 2 ticks */
                cfs_rq->runtime_expires += TICK_NSEC;
        } else {
                /* global deadline is ahead, expiration has passed */
                cfs_rq->runtime_remaining = 0;
        }
}

static void __account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
                                     unsigned long delta_exec)
{
        /* dock delta_exec before expiring quota (as it could span periods) */
        cfs_rq->runtime_remaining -= delta_exec;
        expire_cfs_rq_runtime(cfs_rq);

        if (likely(cfs_rq->runtime_remaining > 0))
                return;

        /*
         * if we're unable to extend our runtime we resched so that the active
         * hierarchy can be throttled
         */
        if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr))
                resched_task(rq_of(cfs_rq)->curr);
}

static __always_inline
void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, unsigned long delta_exec)
{
        if (!cfs_bandwidth_used() || !cfs_rq->runtime_enabled)
                return;

        __account_cfs_rq_runtime(cfs_rq, delta_exec);
}

static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
        return cfs_bandwidth_used() && cfs_rq->throttled;
}

/* check whether cfs_rq, or any parent, is throttled */
static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
{
        return cfs_bandwidth_used() && cfs_rq->throttle_count;
}

/*
 * Ensure that neither of the group entities corresponding to src_cpu or
 * dest_cpu are members of a throttled hierarchy when performing group
 * load-balance operations.
 */
static inline int throttled_lb_pair(struct task_group *tg,
                                    int src_cpu, int dest_cpu)
{
        struct cfs_rq *src_cfs_rq, *dest_cfs_rq;

        src_cfs_rq = tg->cfs_rq[src_cpu];
        dest_cfs_rq = tg->cfs_rq[dest_cpu];

        return throttled_hierarchy(src_cfs_rq) ||
               throttled_hierarchy(dest_cfs_rq);
}

/* updated child weight may affect parent so we have to do this bottom up */
static int tg_unthrottle_up(struct task_group *tg, void *data)
{
        struct rq *rq = data;
        struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];

        cfs_rq->throttle_count--;
#ifdef CONFIG_SMP
        if (!cfs_rq->throttle_count) {
                /* adjust cfs_rq_clock_task() */
                cfs_rq->throttled_clock_task_time += rq->clock_task -
                                             cfs_rq->throttled_clock_task;
        }
#endif

        return 0;
}

static int tg_throttle_down(struct task_group *tg, void *data)
{
        struct rq *rq = data;
        struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];

        /* group is entering throttled state, stop time */
        if (!cfs_rq->throttle_count)
                cfs_rq->throttled_clock_task = rq->clock_task;
        cfs_rq->throttle_count++;

        return 0;
}

static void throttle_cfs_rq(struct cfs_rq *cfs_rq)
{
        struct rq *rq = rq_of(cfs_rq);
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
        struct sched_entity *se;
        long task_delta, dequeue = 1;

        se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];

        /* freeze hierarchy runnable averages while throttled */
        rcu_read_lock();
        walk_tg_tree_from(cfs_rq->tg, tg_throttle_down, tg_nop, (void *)rq);
        rcu_read_unlock();

        task_delta = cfs_rq->h_nr_running;
        for_each_sched_entity(se) {
                struct cfs_rq *qcfs_rq = cfs_rq_of(se);
                /* throttled entity or throttle-on-deactivate */
                if (!se->on_rq)
                        break;

                if (dequeue)
                        dequeue_entity(qcfs_rq, se, DEQUEUE_SLEEP);
                qcfs_rq->h_nr_running -= task_delta;

                if (qcfs_rq->load.weight)
                        dequeue = 0;
        }

        if (!se)
                rq->nr_running -= task_delta;

        cfs_rq->throttled = 1;
        cfs_rq->throttled_clock = rq->clock;
        raw_spin_lock(&cfs_b->lock);
        list_add_tail_rcu(&cfs_rq->throttled_list, &cfs_b->throttled_cfs_rq);
        if (!cfs_b->timer_active)
                __start_cfs_bandwidth(cfs_b);
        raw_spin_unlock(&cfs_b->lock);
}

void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
{
        struct rq *rq = rq_of(cfs_rq);
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
        struct sched_entity *se;
        int enqueue = 1;
        long task_delta;

        se = cfs_rq->tg->se[cpu_of(rq)];

        cfs_rq->throttled = 0;
        raw_spin_lock(&cfs_b->lock);
        cfs_b->throttled_time += rq->clock - cfs_rq->throttled_clock;
        list_del_rcu(&cfs_rq->throttled_list);
        raw_spin_unlock(&cfs_b->lock);

        update_rq_clock(rq);
        /* update hierarchical throttle state */
        walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);

        if (!cfs_rq->load.weight)
                return;

        task_delta = cfs_rq->h_nr_running;
        for_each_sched_entity(se) {
                if (se->on_rq)
                        enqueue = 0;

                cfs_rq = cfs_rq_of(se);
                if (enqueue)
                        enqueue_entity(cfs_rq, se, ENQUEUE_WAKEUP);
                cfs_rq->h_nr_running += task_delta;

                if (cfs_rq_throttled(cfs_rq))
                        break;
        }

        if (!se)
                rq->nr_running += task_delta;

        /* determine whether we need to wake up potentially idle cpu */
        if (rq->curr == rq->idle && rq->cfs.nr_running)
                resched_task(rq->curr);
}

static u64 distribute_cfs_runtime(struct cfs_bandwidth *cfs_b,
                u64 remaining, u64 expires)
{
        struct cfs_rq *cfs_rq;
        u64 runtime = remaining;

        rcu_read_lock();
        list_for_each_entry_rcu(cfs_rq, &cfs_b->throttled_cfs_rq,
                                throttled_list) {
                struct rq *rq = rq_of(cfs_rq);

                raw_spin_lock(&rq->lock);
                if (!cfs_rq_throttled(cfs_rq))
                        goto next;

                runtime = -cfs_rq->runtime_remaining + 1;
                if (runtime > remaining)
                        runtime = remaining;
                remaining -= runtime;

                cfs_rq->runtime_remaining += runtime;
                cfs_rq->runtime_expires = expires;

                /* we check whether we're throttled above */
                if (cfs_rq->runtime_remaining > 0)
                        unthrottle_cfs_rq(cfs_rq);

next:
                raw_spin_unlock(&rq->lock);

                if (!remaining)
                        break;
        }
        rcu_read_unlock();

        return remaining;
}

/*
 * Responsible for refilling a task_group's bandwidth and unthrottling its
 * cfs_rqs as appropriate. If there has been no activity within the last
 * period the timer is deactivated until scheduling resumes; cfs_b->idle is
 * used to track this state.
 */
static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun)
{
        u64 runtime, runtime_expires;
        int idle = 1, throttled;

        raw_spin_lock(&cfs_b->lock);
        /* no need to continue the timer with no bandwidth constraint */
        if (cfs_b->quota == RUNTIME_INF)
                goto out_unlock;

        throttled = !list_empty(&cfs_b->throttled_cfs_rq);
        /* idle depends on !throttled (for the case of a large deficit) */
        idle = cfs_b->idle && !throttled;
        cfs_b->nr_periods += overrun;

        /* if we're going inactive then everything else can be deferred */
        if (idle)
                goto out_unlock;

        /*
         * if we have relooped after returning idle once, we need to update our
         * status as actually running, so that other cpus doing
         * __start_cfs_bandwidth will stop trying to cancel us.
         */
        cfs_b->timer_active = 1;

        __refill_cfs_bandwidth_runtime(cfs_b);

        if (!throttled) {
                /* mark as potentially idle for the upcoming period */
                cfs_b->idle = 1;
                goto out_unlock;
        }

        /* account preceding periods in which throttling occurred */
        cfs_b->nr_throttled += overrun;

        /*
         * There are throttled entities so we must first use the new bandwidth
         * to unthrottle them before making it generally available.  This
         * ensures that all existing debts will be paid before a new cfs_rq is
         * allowed to run.
         */
        runtime = cfs_b->runtime;
        runtime_expires = cfs_b->runtime_expires;
        cfs_b->runtime = 0;

        /*
         * This check is repeated as we are holding onto the new bandwidth
         * while we unthrottle.  This can potentially race with an unthrottled
         * group trying to acquire new bandwidth from the global pool.
         */
        while (throttled && runtime > 0) {
                raw_spin_unlock(&cfs_b->lock);
                /* we can't nest cfs_b->lock while distributing bandwidth */
                runtime = distribute_cfs_runtime(cfs_b, runtime,
                                                 runtime_expires);
                raw_spin_lock(&cfs_b->lock);

                throttled = !list_empty(&cfs_b->throttled_cfs_rq);
        }

        /* return (any) remaining runtime */
        cfs_b->runtime = runtime;
        /*
         * While we are ensured activity in the period following an
         * unthrottle, this also covers the case in which the new bandwidth is
         * insufficient to cover the existing bandwidth deficit.  (Forcing the
         * timer to remain active while there are any throttled entities.)
         */
        cfs_b->idle = 0;
out_unlock:
        if (idle)
                cfs_b->timer_active = 0;
        raw_spin_unlock(&cfs_b->lock);

        return idle;
}

/* a cfs_rq won't donate quota below this amount */
static const u64 min_cfs_rq_runtime = 1 * NSEC_PER_MSEC;
/* minimum remaining period time to redistribute slack quota */
static const u64 min_bandwidth_expiration = 2 * NSEC_PER_MSEC;
/* how long we wait to gather additional slack before distributing */
static const u64 cfs_bandwidth_slack_period = 5 * NSEC_PER_MSEC;

/*
 * Are we near the end of the current quota period?
 *
 * Requires cfs_b->lock for hrtimer_expires_remaining to be safe against the
 * hrtimer base being cleared by __hrtimer_start_range_ns. In the case of
 * migrate_hrtimers, base is never cleared, so we are fine.
 */
static int runtime_refresh_within(struct cfs_bandwidth *cfs_b, u64 min_expire)
{
        struct hrtimer *refresh_timer = &cfs_b->period_timer;
        u64 remaining;

        /* if the call-back is running a quota refresh is already occurring */
        if (hrtimer_callback_running(refresh_timer))
                return 1;

        /* is a quota refresh about to occur? */
        remaining = ktime_to_ns(hrtimer_expires_remaining(refresh_timer));
        if (remaining < min_expire)
                return 1;

        return 0;
}

static void start_cfs_slack_bandwidth(struct cfs_bandwidth *cfs_b)
{
        u64 min_left = cfs_bandwidth_slack_period + min_bandwidth_expiration;

        /* if there's a quota refresh soon don't bother with slack */
        if (runtime_refresh_within(cfs_b, min_left))
                return;

        start_bandwidth_timer(&cfs_b->slack_timer,
                                ns_to_ktime(cfs_bandwidth_slack_period));
}

/* we know any runtime found here is valid as update_curr() precedes return */
static void __return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
        s64 slack_runtime = cfs_rq->runtime_remaining - min_cfs_rq_runtime;

        if (slack_runtime <= 0)
                return;

        raw_spin_lock(&cfs_b->lock);
        if (cfs_b->quota != RUNTIME_INF &&
            cfs_rq->runtime_expires == cfs_b->runtime_expires) {
                cfs_b->runtime += slack_runtime;

                /* we are under rq->lock, defer unthrottling using a timer */
                if (cfs_b->runtime > sched_cfs_bandwidth_slice() &&
                    !list_empty(&cfs_b->throttled_cfs_rq))
                        start_cfs_slack_bandwidth(cfs_b);
        }
        raw_spin_unlock(&cfs_b->lock);

        /* even if it's not valid for return we don't want to try again */
        cfs_rq->runtime_remaining -= slack_runtime;
}

static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        if (!cfs_bandwidth_used())
                return;

        if (!cfs_rq->runtime_enabled || cfs_rq->nr_running)
                return;

        __return_cfs_rq_runtime(cfs_rq);
}

/*
 * This is done with a timer (instead of inline with bandwidth return) since
 * it's necessary to juggle rq->locks to unthrottle their respective cfs_rqs.
 */
static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b)
{
        u64 runtime = 0, slice = sched_cfs_bandwidth_slice();
        u64 expires;

        /* confirm we're still not at a refresh boundary */
        raw_spin_lock(&cfs_b->lock);
        if (runtime_refresh_within(cfs_b, min_bandwidth_expiration)) {
                raw_spin_unlock(&cfs_b->lock);
                return;
        }

        if (cfs_b->quota != RUNTIME_INF && cfs_b->runtime > slice) {
                runtime = cfs_b->runtime;
                cfs_b->runtime = 0;
        }
        expires = cfs_b->runtime_expires;
        raw_spin_unlock(&cfs_b->lock);

        if (!runtime)
                return;

        runtime = distribute_cfs_runtime(cfs_b, runtime, expires);

        raw_spin_lock(&cfs_b->lock);
        if (expires == cfs_b->runtime_expires)
                cfs_b->runtime = runtime;
        raw_spin_unlock(&cfs_b->lock);
}

/*
 * When a group wakes up we want to make sure that its quota is not already
 * expired/exceeded, otherwise it may be allowed to steal additional ticks of
 * runtime as update_curr() throttling can not not trigger until it's on-rq.
 */
static void check_enqueue_throttle(struct cfs_rq *cfs_rq)
{
        if (!cfs_bandwidth_used())
                return;

        /* an active group must be handled by the update_curr()->put() path */
        if (!cfs_rq->runtime_enabled || cfs_rq->curr)
                return;

        /* ensure the group is not already throttled */
        if (cfs_rq_throttled(cfs_rq))
                return;

        /* update runtime allocation */
        account_cfs_rq_runtime(cfs_rq, 0);
        if (cfs_rq->runtime_remaining <= 0)
                throttle_cfs_rq(cfs_rq);
}

/* conditionally throttle active cfs_rq's from put_prev_entity() */
static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        if (!cfs_bandwidth_used())
                return;

        if (likely(!cfs_rq->runtime_enabled || cfs_rq->runtime_remaining > 0))
                return;

        /*
         * it's possible for a throttled entity to be forced into a running
         * state (e.g. set_curr_task), in this case we're finished.
         */
        if (cfs_rq_throttled(cfs_rq))
                return;

        throttle_cfs_rq(cfs_rq);
}

static inline u64 default_cfs_period(void);
static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun);
static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b);

static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
{
        struct cfs_bandwidth *cfs_b =
                container_of(timer, struct cfs_bandwidth, slack_timer);
        do_sched_cfs_slack_timer(cfs_b);

        return HRTIMER_NORESTART;
}

static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer)
{
        struct cfs_bandwidth *cfs_b =
                container_of(timer, struct cfs_bandwidth, period_timer);
        ktime_t now;
        int overrun;
        int idle = 0;

        for (;;) {
                now = hrtimer_cb_get_time(timer);
                overrun = hrtimer_forward(timer, now, cfs_b->period);

                if (!overrun)
                        break;

                idle = do_sched_cfs_period_timer(cfs_b, overrun);
        }

        return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
}

void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
        raw_spin_lock_init(&cfs_b->lock);
        cfs_b->runtime = 0;
        cfs_b->quota = RUNTIME_INF;
        cfs_b->period = ns_to_ktime(default_cfs_period());

        INIT_LIST_HEAD(&cfs_b->throttled_cfs_rq);
        hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        cfs_b->period_timer.function = sched_cfs_period_timer;
        hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        cfs_b->slack_timer.function = sched_cfs_slack_timer;
}

static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
        cfs_rq->runtime_enabled = 0;
        INIT_LIST_HEAD(&cfs_rq->throttled_list);
}

/* requires cfs_b->lock, may release to reprogram timer */
void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
        /*
         * The timer may be active because we're trying to set a new bandwidth
         * period or because we're racing with the tear-down path
         * (timer_active==0 becomes visible before the hrtimer call-back
         * terminates).  In either case we ensure that it's re-programmed
         */
        while (unlikely(hrtimer_active(&cfs_b->period_timer)) &&
               hrtimer_try_to_cancel(&cfs_b->period_timer) < 0) {
                /* bounce the lock to allow do_sched_cfs_period_timer to run */
                raw_spin_unlock(&cfs_b->lock);
                cpu_relax();
                raw_spin_lock(&cfs_b->lock);
                /* if someone else restarted the timer then we're done */
                if (cfs_b->timer_active)
                        return;
        }

        cfs_b->timer_active = 1;
        start_bandwidth_timer(&cfs_b->period_timer, cfs_b->period);
}

static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
        hrtimer_cancel(&cfs_b->period_timer);
        hrtimer_cancel(&cfs_b->slack_timer);
}

static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq)
{
        struct cfs_rq *cfs_rq;

        for_each_leaf_cfs_rq(rq, cfs_rq) {
                struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);

                if (!cfs_rq->runtime_enabled)
                        continue;

                /*
                 * clock_task is not advancing so we just need to make sure
                 * there's some valid quota amount
                 */
                cfs_rq->runtime_remaining = cfs_b->quota;
                if (cfs_rq_throttled(cfs_rq))
                        unthrottle_cfs_rq(cfs_rq);
        }
}

#else /* CONFIG_CFS_BANDWIDTH */
static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
{
        return rq_of(cfs_rq)->clock_task;
}

static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
                                     unsigned long delta_exec) {}
static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
static void check_enqueue_throttle(struct cfs_rq *cfs_rq) {}
static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}

static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
        return 0;
}

static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
{
        return 0;
}

static inline int throttled_lb_pair(struct task_group *tg,
                                    int src_cpu, int dest_cpu)
{
        return 0;
}

void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}

#ifdef CONFIG_FAIR_GROUP_SCHED
static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
#endif

static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
{
        return NULL;
}
static inline void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {}

#endif /* CONFIG_CFS_BANDWIDTH */

/**************************************************
 * CFS operations on tasks:
 */

#ifdef CONFIG_SCHED_HRTICK
static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
{
        struct sched_entity *se = &p->se;
        struct cfs_rq *cfs_rq = cfs_rq_of(se);

        WARN_ON(task_rq(p) != rq);

        if (cfs_rq->nr_running > 1) {
                u64 slice = sched_slice(cfs_rq, se);
                u64 ran = se->sum_exec_runtime - se->prev_sum_exec_runtime;
                s64 delta = slice - ran;

                if (delta < 0) {
                        if (rq->curr == p)
                                resched_task(p);
                        return;
                }

                /*
                 * Don't schedule slices shorter than 10000ns, that just
                 * doesn't make sense. Rely on vruntime for fairness.
                 */
                if (rq->curr != p)
                        delta = max_t(s64, 10000LL, delta);

                hrtick_start(rq, delta);
        }
}

/*
 * called from enqueue/dequeue and updates the hrtick when the
 * current task is from our class and nr_running is low enough
 * to matter.
 */
static void hrtick_update(struct rq *rq)
{
        struct task_struct *curr = rq->curr;

        if (!hrtick_enabled(rq) || curr->sched_class != &fair_sched_class)
                return;

        if (cfs_rq_of(&curr->se)->nr_running < sched_nr_latency)
                hrtick_start_fair(rq, curr);
}
#else /* !CONFIG_SCHED_HRTICK */
static inline void
hrtick_start_fair(struct rq *rq, struct task_struct *p)
{
}

static inline void hrtick_update(struct rq *rq)
{
}
#endif

#if defined(CONFIG_SCHED_HMP) || defined(CONFIG_MTK_SCHED_CMP)

/* CPU cluster statistics for task migration control */
#define HMP_GB (0x1000)
#define HMP_SELECT_RQ (0x2000)
#define HMP_LB (0x4000)
#define HMP_MAX_LOAD (NICE_0_LOAD - 1)


struct clb_env {
        struct clb_stats bstats;
        struct clb_stats lstats;
        int btarget, ltarget;

        struct cpumask *bcpus;
        struct cpumask *lcpus;

        unsigned int flags;
        struct mcheck {
                int status; /* Details of this migration check */
                int result; /* Indicate whether we should perform this task migration */
        } mcheck;
};

unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu);

static void collect_cluster_stats(struct clb_stats *clbs,
            struct cpumask *cluster_cpus, int target)
{
#define HMP_RESOLUTION_SCALING (4)
#define hmp_scale_down(w) ((w) >> HMP_RESOLUTION_SCALING)

        /* Update cluster informatics */
        int cpu;
        for_each_cpu(cpu, cluster_cpus) {
                if(cpu_online(cpu)) {
                        clbs->ncpu ++;
                        clbs->ntask += cpu_rq(cpu)->cfs.h_nr_running;
                        clbs->load_avg += cpu_rq(cpu)->cfs.avg.load_avg_ratio;
#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
                        clbs->nr_normal_prio_task += cfs_nr_normal_prio(cpu);
                        clbs->nr_dequeuing_low_prio += cfs_nr_dequeuing_low_prio(cpu);
#endif
                }
        }

        if(!clbs->ncpu || NR_CPUS == target || !cpumask_test_cpu(target,cluster_cpus))
                return;

        clbs->cpu_power = (int) arch_scale_freq_power(NULL, target);

        /* Scale current CPU compute capacity in accordance with frequency */
        clbs->cpu_capacity = HMP_MAX_LOAD;
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        if (hmp_data.freqinvar_load_scale_enabled) {
                cpu = cpumask_any(cluster_cpus);
                if (freq_scale[cpu].throttling == 1){
                        clbs->cpu_capacity *= freq_scale[cpu].curr_scale;
                }else {
                clbs->cpu_capacity *= freq_scale[cpu].max;
                }
                clbs->cpu_capacity >>= SCHED_FREQSCALE_SHIFT;

                if (clbs->cpu_capacity > HMP_MAX_LOAD){
                        clbs->cpu_capacity = HMP_MAX_LOAD;
                }
        }
#elif defined(CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY)
        if (topology_cpu_inv_power_en()) {
                cpu = cpumask_any(cluster_cpus);
                if (topology_cpu_throttling(cpu))
                        clbs->cpu_capacity *=
                                (topology_cpu_capacity(cpu) << CPUPOWER_FREQSCALE_SHIFT)
                                / (topology_max_cpu_capacity(cpu)+1);
                else
                        clbs->cpu_capacity *= topology_max_cpu_capacity(cpu);
                clbs->cpu_capacity >>= CPUPOWER_FREQSCALE_SHIFT;

                if (clbs->cpu_capacity > HMP_MAX_LOAD){
                        clbs->cpu_capacity = HMP_MAX_LOAD;
                }
        }
#endif

        /*
         * Calculate available CPU capacity
         * Calculate available task space
         *
         * Why load ratio should be multiplied by the number of task ?
         * The task is the entity of scheduling unit so that we should consider
         * it in scheduler. Only considering task load is not enough.
         * Thus, multiplying the number of tasks can adjust load ratio to a more
         * reasonable value.
         */
        clbs->load_avg /= clbs->ncpu;
        clbs->acap = clbs->cpu_capacity - cpu_rq(target)->cfs.avg.load_avg_ratio;
        clbs->scaled_acap = hmp_scale_down(clbs->acap);
        clbs->scaled_atask = cpu_rq(target)->cfs.h_nr_running * cpu_rq(target)->cfs.avg.load_avg_ratio;
        clbs->scaled_atask = clbs->cpu_capacity - clbs->scaled_atask;
        clbs->scaled_atask = hmp_scale_down(clbs->scaled_atask);

        mt_sched_printf("[%s] cpu/cluster:%d/%02lx load/len:%lu/%u stats:%d,%d,%d,%d,%d,%d,%d,%d\n", __func__,
                                        target, *cpumask_bits(cluster_cpus),
                                        cpu_rq(target)->cfs.avg.load_avg_ratio, cpu_rq(target)->cfs.h_nr_running,
                                        clbs->ncpu, clbs->ntask, clbs->load_avg, clbs->cpu_capacity,
                                        clbs->acap, clbs->scaled_acap, clbs->scaled_atask, clbs->threshold);
}

//#define USE_HMP_DYNAMIC_THRESHOLD
#if defined(CONFIG_SCHED_HMP) && defined(USE_HMP_DYNAMIC_THRESHOLD)
static inline void hmp_dynamic_threshold(struct clb_env *clbenv);
#endif

/*
 * Task Dynamic Migration Threshold Adjustment.
 *
 * If the workload between clusters is not balanced, adjust migration
 * threshold in an attempt to move task precisely.
 *
 * Diff. = Max Threshold - Min Threshold
 *
 * Dynamic UP-Threshold =
 *                               B_nacap               B_natask
 * Max Threshold - Diff. x  -----------------  x  -------------------
 *                          B_nacap + L_nacap     B_natask + L_natask
 *
 *
 * Dynamic Down-Threshold =
 *                               L_nacap               L_natask
 * Min Threshold + Diff. x  -----------------  x  -------------------
 *                          B_nacap + L_nacap     B_natask + L_natask
 */
static void adj_threshold(struct clb_env *clbenv)
{
#define TSKLD_SHIFT (2)
#define POSITIVE(x) ((int)(x) < 0 ? 0 : (x))

        int bcpu, lcpu;
        unsigned long b_cap=0, l_cap=0;
        unsigned long b_load=0, l_load=0;
        unsigned long b_task=0, l_task=0;
        int b_nacap, l_nacap, b_natask, l_natask;

#if defined(CONFIG_SCHED_HMP) && defined(USE_HMP_DYNAMIC_THRESHOLD)
        hmp_dynamic_threshold(clbenv);
        return;
#endif

        bcpu = clbenv->btarget;
        lcpu = clbenv->ltarget;
        if (bcpu < nr_cpu_ids) {
                b_load = cpu_rq(bcpu)->cfs.avg.load_avg_ratio;
                b_task = cpu_rq(bcpu)->cfs.h_nr_running;
        }
        if (lcpu < nr_cpu_ids) {
                l_load = cpu_rq(lcpu)->cfs.avg.load_avg_ratio;
                l_task = cpu_rq(lcpu)->cfs.h_nr_running;
        }

#ifdef CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY
        if (bcpu < nr_cpu_ids) {
                b_cap = topology_cpu_capacity(bcpu);
        }
        if (lcpu < nr_cpu_ids) {
                l_cap = topology_cpu_capacity(lcpu);
        }

        b_nacap = POSITIVE(b_cap - b_load);
        b_natask = POSITIVE(b_cap - ((b_task * b_load) >> TSKLD_SHIFT));
        l_nacap = POSITIVE(l_cap - l_load);
        l_natask = POSITIVE(l_cap - ((l_task * l_load) >> TSKLD_SHIFT));
#else /* !CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY */
        b_cap = clbenv->bstats.cpu_power;
        l_cap = clbenv->lstats.cpu_power;
        b_nacap = POSITIVE(clbenv->bstats.scaled_acap *
                                           clbenv->bstats.cpu_power / (clbenv->lstats.cpu_power+1));
        b_natask = POSITIVE(clbenv->bstats.scaled_atask *
                                                clbenv->bstats.cpu_power / (clbenv->lstats.cpu_power+1));
        l_nacap = POSITIVE(clbenv->lstats.scaled_acap);
        l_natask = POSITIVE(clbenv->bstats.scaled_atask);

#endif /* CONFIG_ARCH_SCALE_INVARIANT_CPU_CAPACITY */

        clbenv->bstats.threshold = HMP_MAX_LOAD - HMP_MAX_LOAD * b_nacap * b_natask /
                ((b_nacap + l_nacap) * (b_natask + l_natask)+1);
        clbenv->lstats.threshold = HMP_MAX_LOAD * l_nacap * l_natask /
                ((b_nacap + l_nacap) * (b_natask + l_natask)+1);

        mt_sched_printf("[%s]\tup/dl:%4d/%4d L(%d:%4lu,%4lu/%4lu) b(%d:%4lu,%4lu/%4lu)\n", __func__,
                                        clbenv->bstats.threshold, clbenv->lstats.threshold,
                                        lcpu, l_load, l_task, l_cap,
                                        bcpu, b_load, b_task, b_cap);
}

static void sched_update_clbstats(struct clb_env *clbenv)
{
        collect_cluster_stats(&clbenv->bstats, clbenv->bcpus, clbenv->btarget);
        collect_cluster_stats(&clbenv->lstats, clbenv->lcpus, clbenv->ltarget);
        adj_threshold(clbenv);
}
#endif /* #if defined(CONFIG_SCHED_HMP) || defined(CONFIG_SCHED_CMP) */


#ifdef CONFIG_SCHED_HMP
/*
 * Heterogenous multiprocessor (HMP) optimizations
 *
 * The cpu types are distinguished using a list of hmp_domains
 * which each represent one cpu type using a cpumask.
 * The list is assumed ordered by compute capacity with the
 * fastest domain first.
 */
DEFINE_PER_CPU(struct hmp_domain *, hmp_cpu_domain);
/* We need to know which cpus are fast and slow. */
extern struct cpumask hmp_fast_cpu_mask;
extern struct cpumask hmp_slow_cpu_mask;

extern void __init arch_get_hmp_domains(struct list_head *hmp_domains_list);

/* Setup hmp_domains */
static int __init hmp_cpu_mask_setup(void)
{
        char buf[64];
        struct hmp_domain *domain;
        struct list_head *pos;
        int dc, cpu;

#if defined(CONFIG_SCHED_HMP_ENHANCEMENT) || \
                defined(CONFIG_MT_RT_SCHED) || defined(CONFIG_MT_RT_SCHED_LOG)
        cpumask_clear(&hmp_fast_cpu_mask);
        cpumask_clear(&hmp_slow_cpu_mask);
#endif

        pr_debug("Initializing HMP scheduler:\n");

        /* Initialize hmp_domains using platform code */
        arch_get_hmp_domains(&hmp_domains);
        if (list_empty(&hmp_domains)) {
                pr_debug("HMP domain list is empty!\n");
                return 0;
        }

        /* Print hmp_domains */
        dc = 0;
        list_for_each(pos, &hmp_domains) {
                domain = list_entry(pos, struct hmp_domain, hmp_domains);
                cpulist_scnprintf(buf, 64, &domain->possible_cpus);
                pr_debug("  HMP domain %d: %s\n", dc, buf);

                /* 
                 * According to the description in "arch_get_hmp_domains",
                 * Fastest domain is at head of list. Thus, the fast-cpu mask should
                 * be initialized first, followed by slow-cpu mask.
                 */
#if defined(CONFIG_SCHED_HMP_ENHANCEMENT) || \
                        defined(CONFIG_MT_RT_SCHED) || defined(CONFIG_MT_RT_SCHED_LOG)
                if(cpumask_empty(&hmp_fast_cpu_mask)) {
                        cpumask_copy(&hmp_fast_cpu_mask,&domain->possible_cpus);
                        for_each_cpu(cpu, &hmp_fast_cpu_mask)
                                pr_debug("  HMP fast cpu : %d\n",cpu);
                } else if (cpumask_empty(&hmp_slow_cpu_mask)){
                        cpumask_copy(&hmp_slow_cpu_mask,&domain->possible_cpus);
                        for_each_cpu(cpu, &hmp_slow_cpu_mask)
                                pr_debug("  HMP slow cpu : %d\n",cpu);
                }
#endif

                for_each_cpu_mask(cpu, domain->possible_cpus) {
                        per_cpu(hmp_cpu_domain, cpu) = domain;
                }
                dc++;
        }

        return 1;
}

static struct hmp_domain *hmp_get_hmp_domain_for_cpu(int cpu)
{
        struct hmp_domain *domain;
        struct list_head *pos;

        list_for_each(pos, &hmp_domains) {
                domain = list_entry(pos, struct hmp_domain, hmp_domains);
                if(cpumask_test_cpu(cpu, &domain->possible_cpus))
                        return domain;
        }
        return NULL;
}

static void hmp_online_cpu(int cpu)
{
        struct hmp_domain *domain = hmp_get_hmp_domain_for_cpu(cpu);

        if(domain)
                cpumask_set_cpu(cpu, &domain->cpus);
}

static void hmp_offline_cpu(int cpu)
{
        struct hmp_domain *domain = hmp_get_hmp_domain_for_cpu(cpu);

        if(domain)
                cpumask_clear_cpu(cpu, &domain->cpus);
}

/*
 * Migration thresholds should be in the range [0..1023]
 * hmp_up_threshold: min. load required for migrating tasks to a faster cpu
 * hmp_down_threshold: max. load allowed for tasks migrating to a slower cpu
 * The default values (512, 256) offer good responsiveness, but may need
 * tweaking suit particular needs.
 *
 * hmp_up_prio: Only up migrate task with high priority (<hmp_up_prio)
 * hmp_next_up_threshold: Delay before next up migration (1024 ~= 1 ms)
 * hmp_next_down_threshold: Delay before next down migration (1024 ~= 1 ms)
 */
#ifdef CONFIG_HMP_DYNAMIC_THRESHOLD
unsigned int hmp_up_threshold = 1023;
unsigned int hmp_down_threshold = 0;
#else
unsigned int hmp_up_threshold = 512;
unsigned int hmp_down_threshold = 256;
#endif

unsigned int hmp_next_up_threshold = 4096;
unsigned int hmp_next_down_threshold = 4096;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
#define hmp_last_up_migration(cpu) \
                        cpu_rq(cpu)->cfs.avg.hmp_last_up_migration
#define hmp_last_down_migration(cpu) \
                        cpu_rq(cpu)->cfs.avg.hmp_last_down_migration
static int hmp_select_task_rq_fair(int sd_flag, struct task_struct *p, 
                        int prev_cpu, int new_cpu);
#else
static unsigned int hmp_up_migration(int cpu, int *target_cpu, struct sched_entity *se);
static unsigned int hmp_down_migration(int cpu, struct sched_entity *se);
#endif
static inline unsigned int hmp_domain_min_load(struct hmp_domain *hmpd,
                                                int *min_cpu);

/* Check if cpu is in fastest hmp_domain */
static inline unsigned int hmp_cpu_is_fastest(int cpu)
{
        struct list_head *pos;

        pos = &hmp_cpu_domain(cpu)->hmp_domains;
        return pos == hmp_domains.next;
}

/* Check if cpu is in slowest hmp_domain */
static inline unsigned int hmp_cpu_is_slowest(int cpu)
{
        struct list_head *pos;

        pos = &hmp_cpu_domain(cpu)->hmp_domains;
        return list_is_last(pos, &hmp_domains);
}

/* Next (slower) hmp_domain relative to cpu */
static inline struct hmp_domain *hmp_slower_domain(int cpu)
{
        struct list_head *pos;

        pos = &hmp_cpu_domain(cpu)->hmp_domains;
        return list_entry(pos->next, struct hmp_domain, hmp_domains);
}

/* Previous (faster) hmp_domain relative to cpu */
static inline struct hmp_domain *hmp_faster_domain(int cpu)
{
        struct list_head *pos;

        pos = &hmp_cpu_domain(cpu)->hmp_domains;
        return list_entry(pos->prev, struct hmp_domain, hmp_domains);
}

/*
 * Selects a cpu in previous (faster) hmp_domain
 * Note that cpumask_any_and() returns the first cpu in the cpumask
 */
static inline unsigned int hmp_select_faster_cpu(struct task_struct *tsk,
                                                        int cpu)
{
        int lowest_cpu=NR_CPUS;
        __always_unused int lowest_ratio = hmp_domain_min_load(hmp_faster_domain(cpu), &lowest_cpu);
        /*
         * If the lowest-loaded CPU in the domain is allowed by the task affinity
         * select that one, otherwise select one which is allowed
         */
        if(lowest_cpu < nr_cpu_ids && cpumask_test_cpu(lowest_cpu,tsk_cpus_allowed(tsk)))
                return lowest_cpu;
        else
                return cpumask_any_and(&hmp_faster_domain(cpu)->cpus,
                                tsk_cpus_allowed(tsk));
}

/*
 * Selects a cpu in next (slower) hmp_domain
 * Note that cpumask_any_and() returns the first cpu in the cpumask
 */
static inline unsigned int hmp_select_slower_cpu(struct task_struct *tsk,
                                                        int cpu)
{
        int lowest_cpu=NR_CPUS;
        __always_unused int lowest_ratio = hmp_domain_min_load(hmp_slower_domain(cpu), &lowest_cpu);
        /*
         * If the lowest-loaded CPU in the domain is allowed by the task affinity
         * select that one, otherwise select one which is allowed
         */
        if(lowest_cpu < nr_cpu_ids && cpumask_test_cpu(lowest_cpu,tsk_cpus_allowed(tsk)))
                return lowest_cpu;
        else
                return cpumask_any_and(&hmp_slower_domain(cpu)->cpus,
                                tsk_cpus_allowed(tsk));
}

static inline void hmp_next_up_delay(struct sched_entity *se, int cpu)
{
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        hmp_last_up_migration(cpu) = cfs_rq_clock_task(cfs_rq);
        hmp_last_down_migration(cpu) = 0;
#else
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;

        se->avg.hmp_last_up_migration = cfs_rq_clock_task(cfs_rq);
        se->avg.hmp_last_down_migration = 0;
#endif
}

static inline void hmp_next_down_delay(struct sched_entity *se, int cpu)
{
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        hmp_last_down_migration(cpu) = cfs_rq_clock_task(cfs_rq);
        hmp_last_up_migration(cpu) = 0;
#else
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;

        se->avg.hmp_last_down_migration = cfs_rq_clock_task(cfs_rq);
        se->avg.hmp_last_up_migration = 0;
#endif
}

#ifdef CONFIG_HMP_VARIABLE_SCALE
/*
 * Heterogenous multiprocessor (HMP) optimizations
 *
 * These functions allow to change the growing speed of the load_avg_ratio
 * by default it goes from 0 to 0.5 in LOAD_AVG_PERIOD = 32ms
 * This can now be changed with /sys/kernel/hmp/load_avg_period_ms.
 *
 * These functions also allow to change the up and down threshold of HMP
 * using /sys/kernel/hmp/{up,down}_threshold.
 * Both must be between 0 and 1023. The threshold that is compared
 * to the load_avg_ratio is up_threshold/1024 and down_threshold/1024.
 *
 * For instance, if load_avg_period = 64 and up_threshold = 512, an idle
 * task with a load of 0 will reach the threshold after 64ms of busy loop.
 *
 * Changing load_avg_periods_ms has the same effect than changing the
 * default scaling factor Y=1002/1024 in the load_avg_ratio computation to
 * (1002/1024.0)^(LOAD_AVG_PERIOD/load_avg_period_ms), but the last one
 * could trigger overflows.
 * For instance, with Y = 1023/1024 in __update_task_entity_contrib()
 * "contrib = se->avg.runnable_avg_sum * scale_load_down(se->load.weight);"
 * could be overflowed for a weight > 2^12 even is the load_avg_contrib
 * should still be a 32bits result. This would not happen by multiplicating
 * delta time by 1/22 and setting load_avg_period_ms = 706.
 */

/*
 * By scaling the delta time it end-up increasing or decrease the
 * growing speed of the per entity load_avg_ratio
 * The scale factor hmp_data.multiplier is a fixed point
 * number: (32-HMP_VARIABLE_SCALE_SHIFT).HMP_VARIABLE_SCALE_SHIFT
 */
static u64 hmp_variable_scale_convert(u64 delta)
{
        u64 high = delta >> 32ULL;
        u64 low = delta & 0xffffffffULL;
        low *= hmp_data.multiplier;
        high *= hmp_data.multiplier;
        return (low >> HMP_VARIABLE_SCALE_SHIFT)
                        + (high << (32ULL - HMP_VARIABLE_SCALE_SHIFT));
}

static ssize_t hmp_show(struct kobject *kobj,
                                struct attribute *attr, char *buf)
{
        ssize_t ret = 0;
        struct hmp_global_attr *hmp_attr =
                container_of(attr, struct hmp_global_attr, attr);
        int temp = *(hmp_attr->value);
        if (hmp_attr->to_sysfs != NULL)
                temp = hmp_attr->to_sysfs(temp);
        ret = sprintf(buf, "%d\n", temp);
        return ret;
}

static ssize_t hmp_store(struct kobject *a, struct attribute *attr,
                                const char *buf, size_t count)
{
        int temp;
        ssize_t ret = count;
        struct hmp_global_attr *hmp_attr =
                container_of(attr, struct hmp_global_attr, attr);
        char *str = vmalloc(count + 1);
        if (str == NULL)
                return -ENOMEM;
        memcpy(str, buf, count);
        str[count] = 0;
        if (sscanf(str, "%d", &temp) < 1)
                ret = -EINVAL;
        else {
                if (hmp_attr->from_sysfs != NULL)
                        temp = hmp_attr->from_sysfs(temp);
                if (temp < 0)
                        ret = -EINVAL;
                else
                        *(hmp_attr->value) = temp;
        }
        vfree(str);
        return ret;
}

static int hmp_period_tofrom_sysfs(int value)
{
        return (LOAD_AVG_PERIOD << HMP_VARIABLE_SCALE_SHIFT) / value;
}

/* max value for threshold is 1024 */
static int hmp_theshold_from_sysfs(int value)
{
        if (value > 1024)
                return -1;
        return value;
}
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
/* freqinvar control is only 0,1 off/on */
static int hmp_freqinvar_from_sysfs(int value)
{
        if (value < 0 || value > 1)
                return -1;
        return value;
}
#endif
static void hmp_attr_add(
        const char *name,
        int *value,
        int (*to_sysfs)(int),
        int (*from_sysfs)(int))
{
        int i = 0;
        while (hmp_data.attributes[i] != NULL) {
                i++;
                if (i >= HMP_DATA_SYSFS_MAX)
                        return;
        }
        hmp_data.attr[i].attr.mode = 0644;
        hmp_data.attr[i].show = hmp_show;
        hmp_data.attr[i].store = hmp_store;
        hmp_data.attr[i].attr.name = name;
        hmp_data.attr[i].value = value;
        hmp_data.attr[i].to_sysfs = to_sysfs;
        hmp_data.attr[i].from_sysfs = from_sysfs;
        hmp_data.attributes[i] = &hmp_data.attr[i].attr;
        hmp_data.attributes[i + 1] = NULL;
}

static int hmp_attr_init(void)
{
        int ret;
        memset(&hmp_data, sizeof(hmp_data), 0);
        /* by default load_avg_period_ms == LOAD_AVG_PERIOD
         * meaning no change
         */
         /* LOAD_AVG_PERIOD is too short to trigger heavy task indicator
                so we change it to LOAD_AVG_VARIABLE_PERIOD */
        hmp_data.multiplier = hmp_period_tofrom_sysfs(LOAD_AVG_VARIABLE_PERIOD);

        hmp_attr_add("load_avg_period_ms",
                &hmp_data.multiplier,
                hmp_period_tofrom_sysfs,
                hmp_period_tofrom_sysfs);
        hmp_attr_add("up_threshold",
                &hmp_up_threshold,
                NULL,
                hmp_theshold_from_sysfs);
        hmp_attr_add("down_threshold",
                &hmp_down_threshold,
                NULL,
                hmp_theshold_from_sysfs);
        hmp_attr_add("init_task_load_period",
                &init_task_load_period,
                NULL,
                NULL);
#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        /* default frequency-invariant scaling ON */
        hmp_data.freqinvar_load_scale_enabled = 1;
        hmp_attr_add("frequency_invariant_load_scale",
                &hmp_data.freqinvar_load_scale_enabled,
                NULL,
                hmp_freqinvar_from_sysfs);
#endif
        hmp_data.attr_group.name = "hmp";
        hmp_data.attr_group.attrs = hmp_data.attributes;
        ret = sysfs_create_group(kernel_kobj,
                &hmp_data.attr_group);
        return 0;
}
late_initcall(hmp_attr_init);
#endif /* CONFIG_HMP_VARIABLE_SCALE */

static inline unsigned int hmp_domain_min_load(struct hmp_domain *hmpd,
                                                int *min_cpu)
{
        int cpu;
        int min_cpu_runnable_temp = NR_CPUS;
        unsigned long min_runnable_load = INT_MAX;
        unsigned long contrib;

        for_each_cpu_mask(cpu, hmpd->cpus) {
                /* don't use the divisor in the loop, just at the end */
                contrib = cpu_rq(cpu)->avg.runnable_avg_sum * scale_load_down(1024);
                if (contrib < min_runnable_load) {
                        min_runnable_load = contrib;
                        min_cpu_runnable_temp = cpu;
                }
        }

        if (min_cpu)
                *min_cpu = min_cpu_runnable_temp;

        /* domain will often have at least one empty CPU */
        return min_runnable_load ? min_runnable_load / (LOAD_AVG_MAX + 1) : 0;
}

/*
 * Calculate the task starvation
 * This is the ratio of actually running time vs. runnable time.
 * If the two are equal the task is getting the cpu time it needs or
 * it is alone on the cpu and the cpu is fully utilized.
 */
static inline unsigned int hmp_task_starvation(struct sched_entity *se)
{
        u32 starvation;

        starvation = se->avg.usage_avg_sum * scale_load_down(NICE_0_LOAD);
        starvation /= (se->avg.runnable_avg_sum + 1);

        return scale_load(starvation);
}

static inline unsigned int hmp_offload_down(int cpu, struct sched_entity *se)
{
        int min_usage;
        int dest_cpu = NR_CPUS;

        if (hmp_cpu_is_slowest(cpu))
                return NR_CPUS;

        /* Is the current domain fully loaded? */
        /* load < ~50% */
        min_usage = hmp_domain_min_load(hmp_cpu_domain(cpu), NULL);
        if (min_usage < (NICE_0_LOAD>>1))
                return NR_CPUS;

        /* Is the task alone on the cpu? */
        if (cpu_rq(cpu)->cfs.nr_running < 2)
                return NR_CPUS;

        /* Is the task actually starving? */
        /* >=25% ratio running/runnable = starving */
        if (hmp_task_starvation(se) > 768)
                return NR_CPUS;

        /* Does the slower domain have spare cycles? */
        min_usage = hmp_domain_min_load(hmp_slower_domain(cpu), &dest_cpu);
        /* load > 50% */
        if (min_usage > NICE_0_LOAD/2)
                return NR_CPUS;

        if (cpumask_test_cpu(dest_cpu, &hmp_slower_domain(cpu)->cpus))
                return dest_cpu;

        return NR_CPUS;
}
#endif /* CONFIG_SCHED_HMP */


#ifdef CONFIG_MTK_SCHED_CMP
/* Check if cpu is in fastest hmp_domain */
unsigned int cmp_up_threshold = 512;
unsigned int cmp_down_threshold = 256;
#endif /* CONFIG_MTK_SCHED_CMP */

#ifdef CONFIG_MTK_SCHED_CMP_TGS
static void sched_tg_enqueue_fair(struct rq *rq, struct task_struct *p)
{
        int id;
        unsigned long flags;
        struct task_struct *tg = p->group_leader;

        if (group_leader_is_empty(p))
                return;
        id = get_cluster_id(rq->cpu);
        if (unlikely(WARN_ON(id < 0)))
                return;

        raw_spin_lock_irqsave(&tg->thread_group_info_lock, flags);
        tg->thread_group_info[id].cfs_nr_running++;
        raw_spin_unlock_irqrestore(&tg->thread_group_info_lock, flags);
}

static void sched_tg_dequeue_fair(struct rq *rq, struct task_struct *p)
{
        int id;
        unsigned long flags;
        struct task_struct *tg = p->group_leader;

        if (group_leader_is_empty(p))
                return;
        id = get_cluster_id(rq->cpu);
        if (unlikely(WARN_ON(id < 0)))
                return;

        raw_spin_lock_irqsave(&tg->thread_group_info_lock, flags);
        tg->thread_group_info[id].cfs_nr_running--;
        raw_spin_unlock_irqrestore(&tg->thread_group_info_lock, flags);
}

#endif
/*
 * The enqueue_task method is called before nr_running is
 * increased. Here we update the fair scheduling stats and
 * then put the task into the rbtree:
 */
static void
enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
{
        struct cfs_rq *cfs_rq;
        struct sched_entity *se = &p->se;

        for_each_sched_entity(se) {
                if (se->on_rq)
                        break;
                cfs_rq = cfs_rq_of(se);
                enqueue_entity(cfs_rq, se, flags);

                /*
                 * end evaluation on encountering a throttled cfs_rq
                 *
                 * note: in the case of encountering a throttled cfs_rq we will
                 * post the final h_nr_running increment below.
                */
                if (cfs_rq_throttled(cfs_rq))
                        break;
                cfs_rq->h_nr_running++;

                flags = ENQUEUE_WAKEUP;
        }

        for_each_sched_entity(se) {
                cfs_rq = cfs_rq_of(se);
                cfs_rq->h_nr_running++;

                if (cfs_rq_throttled(cfs_rq))
                        break;

                update_cfs_shares(cfs_rq);
                update_entity_load_avg(se, 1);
        }

        if (!se) {
                update_rq_runnable_avg(rq, rq->nr_running);
                inc_nr_running(rq);
#ifndef CONFIG_CFS_BANDWIDTH
                BUG_ON(rq->cfs.nr_running > rq->cfs.h_nr_running);
#endif
        }
        hrtick_update(rq);
#ifdef CONFIG_HMP_TRACER
        trace_sched_runqueue_length(rq->cpu,rq->nr_running);
        trace_sched_cfs_length(rq->cpu,rq->cfs.h_nr_running);
#endif
#ifdef CONFIG_MET_SCHED_HMP
        RqLen(rq->cpu,rq->nr_running);
        CfsLen(rq->cpu,rq->cfs.h_nr_running);
#endif

#ifdef CONFIG_MTK_SCHED_CMP_TGS
        sched_tg_enqueue_fair(rq, p);
#endif
}

static void set_next_buddy(struct sched_entity *se);

/*
 * The dequeue_task method is called before nr_running is
 * decreased. We remove the task from the rbtree and
 * update the fair scheduling stats:
 */
static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
{
        struct cfs_rq *cfs_rq;
        struct sched_entity *se = &p->se;
        int task_sleep = flags & DEQUEUE_SLEEP;

        for_each_sched_entity(se) {
                cfs_rq = cfs_rq_of(se);
                dequeue_entity(cfs_rq, se, flags);

                /*
                 * end evaluation on encountering a throttled cfs_rq
                 *
                 * note: in the case of encountering a throttled cfs_rq we will
                 * post the final h_nr_running decrement below.
                */
                if (cfs_rq_throttled(cfs_rq))
                        break;
                cfs_rq->h_nr_running--;

                /* Don't dequeue parent if it has other entities besides us */
                if (cfs_rq->load.weight) {
                        /*
                         * Bias pick_next to pick a task from this cfs_rq, as
                         * p is sleeping when it is within its sched_slice.
                         */
                        if (task_sleep && parent_entity(se))
                                set_next_buddy(parent_entity(se));

                        /* avoid re-evaluating load for this entity */
                        se = parent_entity(se);
                        break;
                }
                flags |= DEQUEUE_SLEEP;
        }

        for_each_sched_entity(se) {
                cfs_rq = cfs_rq_of(se);
                cfs_rq->h_nr_running--;

                if (cfs_rq_throttled(cfs_rq))
                        break;

                update_cfs_shares(cfs_rq);
                update_entity_load_avg(se, 1);
        }

        if (!se) {
                dec_nr_running(rq);
#ifndef CONFIG_CFS_BANDWIDTH
                BUG_ON(rq->cfs.nr_running > rq->cfs.h_nr_running);
#endif
                update_rq_runnable_avg(rq, 1);
        }
        hrtick_update(rq);
#ifdef CONFIG_HMP_TRACER
        trace_sched_runqueue_length(rq->cpu,rq->nr_running);
        trace_sched_cfs_length(rq->cpu,rq->cfs.h_nr_running);
#endif
#ifdef CONFIG_MET_SCHED_HMP
        RqLen(rq->cpu,rq->nr_running);
        CfsLen(rq->cpu,rq->cfs.h_nr_running);
#endif

#ifdef CONFIG_MTK_SCHED_CMP_TGS
        sched_tg_dequeue_fair(rq, p);
#endif
}

#ifdef CONFIG_SMP
/* Used instead of source_load when we know the type == 0 */
static unsigned long weighted_cpuload(const int cpu)
{
        return cpu_rq(cpu)->cfs.runnable_load_avg;
}

/*
 * Return a low guess at the load of a migration-source cpu weighted
 * according to the scheduling class and "nice" value.
 *
 * We want to under-estimate the load of migration sources, to
 * balance conservatively.
 */
static unsigned long source_load(int cpu, int type)
{
        struct rq *rq = cpu_rq(cpu);
        unsigned long total = weighted_cpuload(cpu);

        if (type == 0 || !sched_feat(LB_BIAS))
                return total;

        return min(rq->cpu_load[type-1], total);
}

/*
 * Return a high guess at the load of a migration-target cpu weighted
 * according to the scheduling class and "nice" value.
 */
static unsigned long target_load(int cpu, int type)
{
        struct rq *rq = cpu_rq(cpu);
        unsigned long total = weighted_cpuload(cpu);

        if (type == 0 || !sched_feat(LB_BIAS))
                return total;

        return max(rq->cpu_load[type-1], total);
}

static unsigned long power_of(int cpu)
{
        return cpu_rq(cpu)->cpu_power;
}

static unsigned long cpu_avg_load_per_task(int cpu)
{
        struct rq *rq = cpu_rq(cpu);
        unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
        unsigned long load_avg = rq->cfs.runnable_load_avg;

        if (nr_running)
                return load_avg / nr_running;

        return 0;
}


static void task_waking_fair(struct task_struct *p)
{
        struct sched_entity *se = &p->se;
        struct cfs_rq *cfs_rq = cfs_rq_of(se);
        u64 min_vruntime;

#ifndef CONFIG_64BIT
        u64 min_vruntime_copy;

        do {
                min_vruntime_copy = cfs_rq->min_vruntime_copy;
                smp_rmb();
                min_vruntime = cfs_rq->min_vruntime;
        } while (min_vruntime != min_vruntime_copy);
#else
        min_vruntime = cfs_rq->min_vruntime;
#endif

        se->vruntime -= min_vruntime;
}

#ifdef CONFIG_FAIR_GROUP_SCHED
/*
 * effective_load() calculates the load change as seen from the root_task_group
 *
 * Adding load to a group doesn't make a group heavier, but can cause movement
 * of group shares between cpus. Assuming the shares were perfectly aligned one
 * can calculate the shift in shares.
 *
 * Calculate the effective load difference if @wl is added (subtracted) to @tg
 * on this @cpu and results in a total addition (subtraction) of @wg to the
 * total group weight.
 *
 * Given a runqueue weight distribution (rw_i) we can compute a shares
 * distribution (s_i) using:
 *
 *   s_i = rw_i / \Sum rw_j                                             (1)
 *
 * Suppose we have 4 CPUs and our @tg is a direct child of the root group and
 * has 7 equal weight tasks, distributed as below (rw_i), with the resulting
 * shares distribution (s_i):
 *
 *   rw_i = {   2,   4,   1,   0 }
 *   s_i  = { 2/7, 4/7, 1/7,   0 }
 *
 * As per wake_affine() we're interested in the load of two CPUs (the CPU the
 * task used to run on and the CPU the waker is running on), we need to
 * compute the effect of waking a task on either CPU and, in case of a sync
 * wakeup, compute the effect of the current task going to sleep.
 *
 * So for a change of @wl to the local @cpu with an overall group weight change
 * of @wl we can compute the new shares distribution (s'_i) using:
 *
 *   s'_i = (rw_i + @wl) / (@wg + \Sum rw_j)                            (2)
 *
 * Suppose we're interested in CPUs 0 and 1, and want to compute the load
 * differences in waking a task to CPU 0. The additional task changes the
 * weight and shares distributions like:
 *
 *   rw'_i = {   3,   4,   1,   0 }
 *   s'_i  = { 3/8, 4/8, 1/8,   0 }
 *
 * We can then compute the difference in effective weight by using:
 *
 *   dw_i = S * (s'_i - s_i)                                            (3)
 *
 * Where 'S' is the group weight as seen by its parent.
 *
 * Therefore the effective change in loads on CPU 0 would be 5/56 (3/8 - 2/7)
 * times the weight of the group. The effect on CPU 1 would be -4/56 (4/8 -
 * 4/7) times the weight of the group.
 */
static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
{
        struct sched_entity *se = tg->se[cpu];

        if (!tg->parent)        /* the trivial, non-cgroup case */
                return wl;

        for_each_sched_entity(se) {
                long w, W;

                tg = se->my_q->tg;

                /*
                 * W = @wg + \Sum rw_j
                 */
                W = wg + calc_tg_weight(tg, se->my_q);

                /*
                 * w = rw_i + @wl
                 */
                w = se->my_q->load.weight + wl;

                /*
                 * wl = S * s'_i; see (2)
                 */
                if (W > 0 && w < W)
                        wl = (w * tg->shares) / W;
                else
                        wl = tg->shares;

                /*
                 * Per the above, wl is the new se->load.weight value; since
                 * those are clipped to [MIN_SHARES, ...) do so now. See
                 * calc_cfs_shares().
                 */
                if (wl < MIN_SHARES)
                        wl = MIN_SHARES;

                /*
                 * wl = dw_i = S * (s'_i - s_i); see (3)
                 */
                wl -= se->load.weight;

                /*
                 * Recursively apply this logic to all parent groups to compute
                 * the final effective load change on the root group. Since
                 * only the @tg group gets extra weight, all parent groups can
                 * only redistribute existing shares. @wl is the shift in shares
                 * resulting from this level per the above.
                 */
                wg = 0;
        }

        return wl;
}
#else

static inline unsigned long effective_load(struct task_group *tg, int cpu,
                unsigned long wl, unsigned long wg)
{
        return wl;
}

#endif

static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
{
        s64 this_load, load;
        int idx, this_cpu, prev_cpu;
        unsigned long tl_per_task;
        struct task_group *tg;
        unsigned long weight;
        int balanced;

        idx       = sd->wake_idx;
        this_cpu  = smp_processor_id();
        prev_cpu  = task_cpu(p);
        load      = source_load(prev_cpu, idx);
        this_load = target_load(this_cpu, idx);

        /*
         * If sync wakeup then subtract the (maximum possible)
         * effect of the currently running task from the load
         * of the current CPU:
         */
        if (sync) {
                tg = task_group(current);
                weight = current->se.load.weight;

                this_load += effective_load(tg, this_cpu, -weight, -weight);
                load += effective_load(tg, prev_cpu, 0, -weight);
        }

        tg = task_group(p);
        weight = p->se.load.weight;

        /*
         * In low-load situations, where prev_cpu is idle and this_cpu is idle
         * due to the sync cause above having dropped this_load to 0, we'll
         * always have an imbalance, but there's really nothing you can do
         * about that, so that's good too.
         *
         * Otherwise check if either cpus are near enough in load to allow this
         * task to be woken on this_cpu.
         */
        if (this_load > 0) {
                s64 this_eff_load, prev_eff_load;

                this_eff_load = 100;
                this_eff_load *= power_of(prev_cpu);
                this_eff_load *= this_load +
                        effective_load(tg, this_cpu, weight, weight);

                prev_eff_load = 100 + (sd->imbalance_pct - 100) / 2;
                prev_eff_load *= power_of(this_cpu);
                prev_eff_load *= load + effective_load(tg, prev_cpu, 0, weight);

                balanced = this_eff_load <= prev_eff_load;
        } else
                balanced = true;

        /*
         * If the currently running task will sleep within
         * a reasonable amount of time then attract this newly
         * woken task:
         */
        if (sync && balanced)
                return 1;

        schedstat_inc(p, se.statistics.nr_wakeups_affine_attempts);
        tl_per_task = cpu_avg_load_per_task(this_cpu);

        if (balanced ||
            (this_load <= load &&
             this_load + target_load(prev_cpu, idx) <= tl_per_task)) {
                /*
                 * This domain has SD_WAKE_AFFINE and
                 * p is cache cold in this domain, and
                 * there is no bad imbalance.
                 */
                schedstat_inc(sd, ttwu_move_affine);
                schedstat_inc(p, se.statistics.nr_wakeups_affine);

                return 1;
        }
        return 0;
}

/*
 * find_idlest_group finds and returns the least busy CPU group within the
 * domain.
 */
static struct sched_group *
find_idlest_group(struct sched_domain *sd, struct task_struct *p,
                  int this_cpu, int load_idx)
{
        struct sched_group *idlest = NULL, *group = sd->groups;
        unsigned long min_load = ULONG_MAX, this_load = 0;
        int imbalance = 100 + (sd->imbalance_pct-100)/2;

        do {
                unsigned long load, avg_load;
                int local_group;
                int i;

                /* Skip over this group if it has no CPUs allowed */
                if (!cpumask_intersects(sched_group_cpus(group),
                                        tsk_cpus_allowed(p)))
                        continue;

                local_group = cpumask_test_cpu(this_cpu,
                                               sched_group_cpus(group));

                /* Tally up the load of all CPUs in the group */
                avg_load = 0;

                for_each_cpu(i, sched_group_cpus(group)) {
                        /* Bias balancing toward cpus of our domain */
                        if (local_group)
                                load = source_load(i, load_idx);
                        else
                                load = target_load(i, load_idx);

                        avg_load += load;

                        mt_sched_printf("find_idlest_group cpu=%d avg=%lu",
                                i, avg_load);
                }

                /* Adjust by relative CPU power of the group */
                avg_load = (avg_load * SCHED_POWER_SCALE) / group->sgp->power;

                if (local_group) {
                        this_load = avg_load;
                        mt_sched_printf("find_idlest_group this_load=%lu",
                                this_load);
                } else if (avg_load < min_load) {
                        min_load = avg_load;
                        idlest = group;
                        mt_sched_printf("find_idlest_group min_load=%lu",
                                min_load);
                }
        } while (group = group->next, group != sd->groups);

        if (!idlest || 100*this_load < imbalance*min_load){
                mt_sched_printf("find_idlest_group fail this_load=%lu min_load=%lu, imbalance=%d",
                        this_load, min_load, imbalance);
                return NULL;
        }
        return idlest;
}

/*
 * find_idlest_cpu - find the idlest cpu among the cpus in group.
 */
static int
find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
{
        unsigned long load, min_load = ULONG_MAX;
        int idlest = -1;
        int i;

        /* Traverse only the allowed CPUs */
        for_each_cpu_and(i, sched_group_cpus(group), tsk_cpus_allowed(p)) {
                load = weighted_cpuload(i);

                if (load < min_load || (load == min_load && i == this_cpu)) {
                        min_load = load;
                        idlest = i;
                }
        }

        return idlest;
}

/*
 * Try and locate an idle CPU in the sched_domain.
 */
static int select_idle_sibling(struct task_struct *p, int target)
{
        struct sched_domain *sd;
        struct sched_group *sg;
        int i = task_cpu(p);

        if (idle_cpu(target))
                return target;

        /*
         * If the prevous cpu is cache affine and idle, don't be stupid.
         */
        if (i != target && cpus_share_cache(i, target) && idle_cpu(i))
                return i;

        /*
         * Otherwise, iterate the domains and find an elegible idle cpu.
         */
        sd = rcu_dereference(per_cpu(sd_llc, target));
        for_each_lower_domain(sd) {
                sg = sd->groups;
                do {
                        if (!cpumask_intersects(sched_group_cpus(sg),
                                                tsk_cpus_allowed(p)))
                                goto next;

                        for_each_cpu(i, sched_group_cpus(sg)) {
                                if (i == target || !idle_cpu(i))
                                        goto next;
                        }

                        target = cpumask_first_and(sched_group_cpus(sg),
                                        tsk_cpus_allowed(p));
                        goto done;
next:
                        sg = sg->next;
                } while (sg != sd->groups);
        }
done:
        return target;
}

#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
/*
 * @p:      the task want to be located at.
 * @clid:   the CPU cluster id to be search for the target CPU
 * @target: the appropriate CPU for task p, updated by this function.
 *
 * Return:
 *
 * 1 on success
 * 0 if target CPU is not found in this CPU cluster
 */
static int cmp_find_idle_cpu(struct task_struct *p, int clid, int *target)
{
        struct cpumask cls_cpus;
        int j;

        get_cluster_cpus(&cls_cpus, clid, true);
        *target = cpumask_any_and(&cls_cpus, tsk_cpus_allowed(p));
        for_each_cpu(j, &cls_cpus) {
                if (idle_cpu(j) && cpumask_test_cpu(j, tsk_cpus_allowed(p))) {
                        *target = j;
                        break;
                }
        }
        if (*target >= nr_cpu_ids)
                return 0; // task is not allow in this CPU cluster
        mt_sched_printf("wakeup %d %s cpu=%d, max_clid/max_idle_clid=%d",
                p->pid, p->comm, *target, clid);

        return 1;
}

#if !defined(CONFIG_SCHED_HMP)
#define TGS_WAKEUP_EXPERIMENT
#endif
static int cmp_select_task_rq_fair(struct task_struct *p, int sd_flag, int *cpu)
{
        int i, j;
        int max_cnt=0, tskcnt;
        int tgs_clid=-1;
        int idle_cnt, max_idle_cnt=0;
        int in_prev=0, prev_cluster=0;
        struct cpumask cls_cpus;
        int num_cluster;

        num_cluster=arch_get_nr_clusters();
        for(i=0; i< num_cluster; i++) {
                tskcnt= p->group_leader->thread_group_info[i].nr_running;
                idle_cnt = 0;
                get_cluster_cpus(&cls_cpus, i, true);

                for_each_cpu(j, &cls_cpus) {
#ifdef TGS_WAKEUP_EXPERIMENT
                        if (arch_is_big_little()) {
                                int bcpu = arch_cpu_is_big(j);
                                if (bcpu && p->se.avg.load_avg_ratio >= cmp_up_threshold) {
                                        in_prev = 0;
                                        tgs_clid = i;
                                        mt_sched_printf("[heavy task] wakeup load=%ld up_th=%u pid=%d name=%s cpu=%d, tgs_clid=%d in_prev=%d",
                                                                        p->se.avg.load_avg_ratio, cmp_up_threshold, p->pid, p->comm, *cpu, tgs_clid, in_prev);
                                        goto find_idle_cpu;
                                }
                                if (!bcpu && p->se.avg.load_avg_ratio < cmp_down_threshold) {
                                        in_prev = 0;
                                        tgs_clid = i;
                                        mt_sched_printf("[light task] wakeup load=%ld down_th=%u pid=%d name=%s cpu=%d, tgs_clid=%d in_prev=%d",
                                                                        p->se.avg.load_avg_ratio, cmp_down_threshold, p->pid, p->comm, *cpu, tgs_clid, in_prev);
                                        goto find_idle_cpu;
                                }
                        }
#endif
                        if (idle_cpu(j))
                                idle_cnt++;
                }
                mt_sched_printf("wakeup load=%ld pid=%d name=%s clid=%d idle_cnt=%d tskcnt=%d max_cnt=%d, cls_cpus=%02lx, onlineCPU=%02lx",
                                                p->se.avg.load_avg_ratio, p->pid, p->comm, i, idle_cnt, tskcnt, max_cnt,
                                                *cpumask_bits(&cls_cpus), *cpumask_bits(cpu_online_mask));

                if (idle_cnt == 0)
                        continue;

                if (i == get_cluster_id(*cpu))
                        prev_cluster = 1;

                if (tskcnt > 0) {
                        if ( (tskcnt > max_cnt) || ((tskcnt == max_cnt) && prev_cluster)) {
                                in_prev = prev_cluster;
                                tgs_clid = i;
                                max_cnt = tskcnt;
                        }
                } else if (0 == max_cnt) {
                        if ((idle_cnt > max_idle_cnt) || ((idle_cnt == max_idle_cnt) && prev_cluster)) {
                                in_prev = prev_cluster;
                                tgs_clid = i ;
                                max_idle_cnt = idle_cnt;
                        }

                }
                mt_sched_printf("wakeup %d %s i=%d idle_cnt=%d tgs_clid=%d max_cnt=%d max_idle_cnt=%d in_prev=%d",
                        p->pid, p->comm, i, idle_cnt, tgs_clid, max_cnt, max_idle_cnt, in_prev);
        }

#ifdef TGS_WAKEUP_EXPERIMENT
find_idle_cpu:
#endif
        mt_sched_printf("wakeup %d %s cpu=%d, tgs_clid=%d in_prev=%d",
                p->pid, p->comm, *cpu, tgs_clid, in_prev);

        if(-1 != tgs_clid && !in_prev && cmp_find_idle_cpu(p, tgs_clid, cpu))
                return 1;

        return 0;
}
#endif

#ifdef CONFIG_MTK_SCHED_TRACERS
#define LB_RESET                0
#define LB_AFFINITY             0x10
#define LB_BUDDY                0x20
#define LB_FORK                 0x30
#define LB_CMP_SHIFT    8
#define LB_CMP                  0x4000
#define LB_SMP_SHIFT    16
#define LB_SMP                  0x500000
#define LB_HMP_SHIFT    24
#define LB_HMP                  0x60000000
#endif

/*
 * sched_balance_self: balance the current task (running on cpu) in domains
 * that have the 'flag' flag set. In practice, this is SD_BALANCE_FORK and
 * SD_BALANCE_EXEC.
 *
 * Balance, ie. select the least loaded group.
 *
 * Returns the target CPU number, or the same CPU if no balancing is needed.
 *
 * preempt must be disabled.
 */
static int
select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
{
        struct sched_domain *tmp, *affine_sd = NULL, *sd = NULL;
        int cpu = smp_processor_id();
        int prev_cpu = task_cpu(p);
        int new_cpu = cpu;
        int want_affine = 0;
        int sync = wake_flags & WF_SYNC;
#if defined(CONFIG_SCHED_HMP) && !defined(CONFIG_SCHED_HMP_ENHANCEMENT)
        int target_cpu = nr_cpu_ids;
#endif
#ifdef CONFIG_MTK_SCHED_TRACERS
        int policy = 0;
#endif
#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
        int cmp_cpu;
        int cmp_cpu_found=0;
#endif
#ifdef CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK     
        int buddy_cpu = per_cpu(sd_pack_buddy, cpu);
#endif

        if (p->nr_cpus_allowed == 1)
        {
#ifdef CONFIG_MTK_SCHED_TRACERS
                trace_sched_select_task_rq(p, (LB_AFFINITY | prev_cpu), prev_cpu, prev_cpu);
#endif
                return prev_cpu;
        }

#ifdef CONFIG_HMP_PACK_SMALL_TASK
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
        if (check_pack_buddy(cpu, p) && PA_ENABLE) {
                PACK_FROM_CPUX_TO_CPUY_COUNT[cpu][per_cpu(sd_pack_buddy, cpu)]++;

#ifdef CONFIG_HMP_TRACER
                trace_sched_power_aware_active(POWER_AWARE_ACTIVE_MODULE_PACK_FORM_CPUX_TO_CPUY, p->pid, cpu, per_cpu(sd_pack_buddy, cpu));
#endif /* CONFIG_HMP_TRACER */
                
                if(PA_MON_ENABLE) {
                        if(strcmp(p->comm, PA_MON) == 0 && cpu != per_cpu(sd_pack_buddy, cpu)) {
                                printk(KERN_EMERG "[PA] %s PACK From CPU%d to CPU%d\n", p->comm, cpu, per_cpu(sd_pack_buddy, cpu));
                                printk(KERN_EMERG "[PA]   Buddy RQ Usage = %u, Period = %u, NR = %u\n", 
                                                                                                                per_cpu(BUDDY_CPU_RQ_USAGE, per_cpu(sd_pack_buddy, cpu)),
                                                                                                                per_cpu(BUDDY_CPU_RQ_PERIOD, per_cpu(sd_pack_buddy, cpu)),
                                                                                                                per_cpu(BUDDY_CPU_RQ_NR, per_cpu(sd_pack_buddy, cpu)));
                                printk(KERN_EMERG "[PA]   Task Usage = %u, Period = %u\n", 
                                                                                                                per_cpu(TASK_USGAE, cpu),
                                                                                                                per_cpu(TASK_PERIOD, cpu));
                        }
                }
#else /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
        if (check_pack_buddy(cpu, p)) {
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
#ifdef CONFIG_MTK_SCHED_TRACERS
                new_cpu = per_cpu(sd_pack_buddy, cpu);
                trace_sched_select_task_rq(p, (LB_BUDDY | new_cpu), prev_cpu, new_cpu);
#endif
                return per_cpu(sd_pack_buddy, cpu);
        }
#elif defined (CONFIG_MTK_SCHED_CMP_PACK_SMALL_TASK)
#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER
        if (PA_ENABLE && (sd_flag & SD_BALANCE_WAKE) && (check_pack_buddy(buddy_cpu, p))) {
#else
        if ((sd_flag & SD_BALANCE_WAKE) && (check_pack_buddy(buddy_cpu, p))) {
#endif
                struct thread_group_info_t *src_tginfo, *dst_tginfo;
                src_tginfo = &p->group_leader->thread_group_info[get_cluster_id(prev_cpu)]; //Compare with previous cpu(Not current cpu)
                dst_tginfo = &p->group_leader->thread_group_info[get_cluster_id(buddy_cpu)];
                if((get_cluster_id(prev_cpu) == get_cluster_id(buddy_cpu)) ||  
                        (src_tginfo->nr_running < dst_tginfo->nr_running))
                {
#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER
                        PACK_FROM_CPUX_TO_CPUY_COUNT[cpu][buddy_cpu]++;
                        mt_sched_printf("[PA]pid=%d, Pack to CPU%d(CPU%d's buddy)\n", p->pid,buddy_cpu,cpu);
                        if(PA_MON_ENABLE) {
                                u8 i=0;
                                for(i=0;i<4; i++) {
                                        if(strcmp(p->comm, &PA_MON[i][0]) == 0) {
                                                TASK_PACK_CPU_COUNT[i][buddy_cpu]++;
                                                printk(KERN_EMERG "[PA] %s PACK to CPU%d(CPU%d's buddy), pre(cpu%d)\n", p->comm, buddy_cpu,cpu, prev_cpu);
                                                printk(KERN_EMERG "[PA]   Buddy RQ Usage = %u, Period = %u, NR = %u\n", 
                                                                                                                                per_cpu(BUDDY_CPU_RQ_USAGE, buddy_cpu),
                                                                                                                                per_cpu(BUDDY_CPU_RQ_PERIOD, buddy_cpu),
                                                                                                                                per_cpu(BUDDY_CPU_RQ_NR, buddy_cpu));
                                                printk(KERN_EMERG "[PA]   Task Usage = %u, Period = %u\n", 
                                                                                                                                per_cpu(TASK_USGAE, cpu),
                                                                                                                                per_cpu(TASK_PERIOD, cpu));
                                                break;                                                                          
                                        }
                                }
                        }       
#endif //CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER                    
#ifdef CONFIG_MTK_SCHED_TRACERS
                        trace_sched_select_task_rq(p, (LB_BUDDY | buddy_cpu), prev_cpu, buddy_cpu);
#endif
                        return buddy_cpu;
                }               
        }
#endif /* CONFIG_HMP_PACK_SMALL_TASK */

#ifdef CONFIG_SCHED_HMP
        /* always put non-kernel forking tasks on a big domain */
        if (p->mm && (sd_flag & SD_BALANCE_FORK)) {
                if(hmp_cpu_is_fastest(prev_cpu)) {
                        struct hmp_domain *hmpdom = list_entry(&hmp_cpu_domain(prev_cpu)->hmp_domains, struct hmp_domain, hmp_domains);
                        __always_unused int lowest_ratio = hmp_domain_min_load(hmpdom, &new_cpu);
                        if(new_cpu < nr_cpu_ids && cpumask_test_cpu(new_cpu,tsk_cpus_allowed(p)))
                        {
#ifdef CONFIG_MTK_SCHED_TRACERS
                                trace_sched_select_task_rq(p, (LB_FORK | new_cpu), prev_cpu, new_cpu);
#endif
                                return new_cpu;
                        }
                        else
                        {
                                new_cpu = cpumask_any_and(&hmp_faster_domain(cpu)->cpus,
                                                tsk_cpus_allowed(p));
                                if(new_cpu < nr_cpu_ids)
                                {
#ifdef CONFIG_MTK_SCHED_TRACERS
                                        trace_sched_select_task_rq(p, (LB_FORK | new_cpu), prev_cpu, new_cpu);
#endif
                                        return new_cpu;
                                }
                        }
                } else {
                        new_cpu = hmp_select_faster_cpu(p, prev_cpu);
                        if (new_cpu < nr_cpu_ids)
                        {
#ifdef CONFIG_MTK_SCHED_TRACERS
                                trace_sched_select_task_rq(p, (LB_FORK | new_cpu), prev_cpu, new_cpu);
#endif
                                return new_cpu;
                        }
                }
                // to recover new_cpu value
                if (new_cpu >= nr_cpu_ids)
                        new_cpu = cpu;
        }
#endif

        if (sd_flag & SD_BALANCE_WAKE) {
                if (cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))
                        want_affine = 1;
                new_cpu = prev_cpu;
        }

#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
        cmp_cpu = prev_cpu;
        cmp_cpu_found = cmp_select_task_rq_fair(p, sd_flag, &cmp_cpu);
        if (cmp_cpu_found && (cmp_cpu < nr_cpu_ids)) {
                cpu = cmp_cpu;
                new_cpu = cmp_cpu;
#ifdef CONFIG_MTK_SCHED_TRACERS
                policy |= (new_cpu << LB_CMP_SHIFT);
                policy |= LB_CMP;
#endif
                mt_sched_printf("wakeup %d %s sd_flag=%x cmp_cpu_found=%d, cpu=%d, want_affine=%d ",
                        p->pid, p->comm, sd_flag, cmp_cpu_found, cpu, want_affine);
                goto cmp_found;
        }
#endif
        rcu_read_lock();
        for_each_domain(cpu, tmp) {
                mt_sched_printf("wakeup %d %s tmp->flags=%x, cpu=%d, prev_cpu=%d, new_cpu=%d",
                        p->pid, p->comm, tmp->flags, cpu, prev_cpu, new_cpu); 

                if (!(tmp->flags & SD_LOAD_BALANCE))
                        continue;

                /*
                 * If both cpu and prev_cpu are part of this domain,
                 * cpu is a valid SD_WAKE_AFFINE target.
                 */
                if (want_affine && (tmp->flags & SD_WAKE_AFFINE) &&
                    cpumask_test_cpu(prev_cpu, sched_domain_span(tmp))) {
                        affine_sd = tmp;
                        break;
                }

                if (tmp->flags & sd_flag)
                        sd = tmp;
        }

        if (affine_sd) {
                if (cpu != prev_cpu && wake_affine(affine_sd, p, sync))
                        prev_cpu = cpu;

                new_cpu = select_idle_sibling(p, prev_cpu);
                goto unlock;
        }

        mt_sched_printf("wakeup %d %s sd=%p", p->pid, p->comm, sd);

        while (sd) {
                int load_idx = sd->forkexec_idx;
                struct sched_group *group;
                int weight;

                mt_sched_printf("wakeup %d %s find_idlest_group cpu=%d sd->flags=%x sd_flag=%x",
                        p->pid, p->comm, cpu, sd->flags, sd_flag);

                if (!(sd->flags & sd_flag)) {
                        sd = sd->child;
                        continue;
                }

                if (sd_flag & SD_BALANCE_WAKE)
                        load_idx = sd->wake_idx;

                mt_sched_printf("wakeup %d %s find_idlest_group cpu=%d",
                        p->pid, p->comm, cpu);
                group = find_idlest_group(sd, p, cpu, load_idx);
                if (!group) {
                        sd = sd->child;
                        mt_sched_printf("wakeup %d %s find_idlest_group child", 
                                p->pid, p->comm);
                        continue;
                }

                new_cpu = find_idlest_cpu(group, p, cpu);
                if (new_cpu == -1 || new_cpu == cpu) {
                        /* Now try balancing at a lower domain level of cpu */
                        sd = sd->child;
                        mt_sched_printf("wakeup %d %s find_idlest_cpu sd->child=%p",
                                p->pid, p->comm, sd);
                        continue;
                }

                /* Now try balancing at a lower domain level of new_cpu */
                mt_sched_printf("wakeup %d %s find_idlest_cpu cpu=%d sd=%p",
                                p->pid, p->comm, new_cpu, sd);
                cpu = new_cpu;
                weight = sd->span_weight;
                sd = NULL;
                for_each_domain(cpu, tmp) {
                        if (weight <= tmp->span_weight)
                                break;
                        if (tmp->flags & sd_flag)
                                sd = tmp;
                        mt_sched_printf("wakeup %d %s sd=%p weight=%d, tmp->span_weight=%d", 
                                p->pid, p->comm, sd, weight, tmp->span_weight);
                }
                /* while loop will break here if sd == NULL */
        }

#ifdef CONFIG_MTK_SCHED_TRACERS
        policy |= (new_cpu << LB_SMP_SHIFT);
        policy |= LB_SMP;
#endif

unlock:
        rcu_read_unlock();
        mt_sched_printf("wakeup %d %s new_cpu=%x", p->pid, p->comm, new_cpu);

#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
cmp_found:
#endif

#ifdef CONFIG_SCHED_HMP
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        new_cpu = hmp_select_task_rq_fair(sd_flag, p, prev_cpu, new_cpu);
#ifdef CONFIG_MTK_SCHED_TRACERS
        policy |= (new_cpu << LB_HMP_SHIFT);
        policy |= LB_HMP;
#endif

#else
        if (hmp_up_migration(prev_cpu, &target_cpu, &p->se)) {
                new_cpu = hmp_select_faster_cpu(p, prev_cpu);
                hmp_next_up_delay(&p->se, new_cpu);
                trace_sched_hmp_migrate(p, new_cpu, 0);
                return new_cpu;
        }
        if (hmp_down_migration(prev_cpu, &p->se)) {
                new_cpu = hmp_select_slower_cpu(p, prev_cpu);
                hmp_next_down_delay(&p->se, new_cpu);
                trace_sched_hmp_migrate(p, new_cpu, 0);
                return new_cpu;
        }
        /* Make sure that the task stays in its previous hmp domain */
        if (!cpumask_test_cpu(new_cpu, &hmp_cpu_domain(prev_cpu)->cpus))
                return prev_cpu;
#endif /* CONFIG_SCHED_HMP_ENHANCEMENT */
#endif /* CONFIG_SCHED_HMP */

#ifdef CONFIG_MTK_SCHED_TRACERS
        trace_sched_select_task_rq(p, policy, prev_cpu, new_cpu);
#endif

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
        if(PA_MON_ENABLE) {
                if(strcmp(p->comm, PA_MON) == 0 && cpu != new_cpu) {
                        printk(KERN_EMERG "[PA] %s Select From CPU%d to CPU%d\n", p->comm, cpu, new_cpu);
                }
        }
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */

        return new_cpu;
}

/*
 * Called immediately before a task is migrated to a new cpu; task_cpu(p) and
 * cfs_rq_of(p) references at time of call are still valid and identify the
 * previous cpu.  However, the caller only guarantees p->pi_lock is held; no
 * other assumptions, including the state of rq->lock, should be made.
 */
static void
migrate_task_rq_fair(struct task_struct *p, int next_cpu)
{
        struct sched_entity *se = &p->se;
        struct cfs_rq *cfs_rq = cfs_rq_of(se);

        /*
         * Load tracking: accumulate removed load so that it can be processed
         * when we next update owning cfs_rq under rq->lock.  Tasks contribute
         * to blocked load iff they have a positive decay-count.  It can never
         * be negative here since on-rq tasks have decay-count == 0.
         */
        if (se->avg.decay_count) {
                se->avg.decay_count = -__synchronize_entity_decay(se);
                atomic_long_add(se->avg.load_avg_contrib,
                                                &cfs_rq->removed_load);
        }
}
#endif /* CONFIG_SMP */

static unsigned long
wakeup_gran(struct sched_entity *curr, struct sched_entity *se)
{
        unsigned long gran = sysctl_sched_wakeup_granularity;

        /*
         * Since its curr running now, convert the gran from real-time
         * to virtual-time in his units.
         *
         * By using 'se' instead of 'curr' we penalize light tasks, so
         * they get preempted easier. That is, if 'se' < 'curr' then
         * the resulting gran will be larger, therefore penalizing the
         * lighter, if otoh 'se' > 'curr' then the resulting gran will
         * be smaller, again penalizing the lighter task.
         *
         * This is especially important for buddies when the leftmost
         * task is higher priority than the buddy.
         */
        return calc_delta_fair(gran, se);
}

/*
 * Should 'se' preempt 'curr'.
 *
 *             |s1
 *        |s2
 *   |s3
 *         g
 *      |<--->|c
 *
 *  w(c, s1) = -1
 *  w(c, s2) =  0
 *  w(c, s3) =  1
 *
 */
static int
wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
{
        s64 gran, vdiff = curr->vruntime - se->vruntime;

        if (vdiff <= 0)
                return -1;

        gran = wakeup_gran(curr, se);
        if (vdiff > gran)
                return 1;

        return 0;
}

static void set_last_buddy(struct sched_entity *se)
{
        if (entity_is_task(se) && unlikely(task_of(se)->policy == SCHED_IDLE))
                return;

        for_each_sched_entity(se)
                cfs_rq_of(se)->last = se;
}

static void set_next_buddy(struct sched_entity *se)
{
        if (entity_is_task(se) && unlikely(task_of(se)->policy == SCHED_IDLE))
                return;

        for_each_sched_entity(se)
                cfs_rq_of(se)->next = se;
}

static void set_skip_buddy(struct sched_entity *se)
{
        for_each_sched_entity(se)
                cfs_rq_of(se)->skip = se;
}

/*
 * Preempt the current task with a newly woken task if needed:
 */
static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)
{
        struct task_struct *curr = rq->curr;
        struct sched_entity *se = &curr->se, *pse = &p->se;
        struct cfs_rq *cfs_rq = task_cfs_rq(curr);
        int scale = cfs_rq->nr_running >= sched_nr_latency;
        int next_buddy_marked = 0;

        if (unlikely(se == pse))
                return;

        /*
         * This is possible from callers such as move_task(), in which we
         * unconditionally check_prempt_curr() after an enqueue (which may have
         * lead to a throttle).  This both saves work and prevents false
         * next-buddy nomination below.
         */
        if (unlikely(throttled_hierarchy(cfs_rq_of(pse))))
                return;

        if (sched_feat(NEXT_BUDDY) && scale && !(wake_flags & WF_FORK)) {
                set_next_buddy(pse);
                next_buddy_marked = 1;
        }

        /*
         * We can come here with TIF_NEED_RESCHED already set from new task
         * wake up path.
         *
         * Note: this also catches the edge-case of curr being in a throttled
         * group (e.g. via set_curr_task), since update_curr() (in the
         * enqueue of curr) will have resulted in resched being set.  This
         * prevents us from potentially nominating it as a false LAST_BUDDY
         * below.
         */
        if (test_tsk_need_resched(curr))
                return;

        /* Idle tasks are by definition preempted by non-idle tasks. */
        if (unlikely(curr->policy == SCHED_IDLE) &&
            likely(p->policy != SCHED_IDLE))
                goto preempt;

        /*
         * Batch and idle tasks do not preempt non-idle tasks (their preemption
         * is driven by the tick):
         */
        if (unlikely(p->policy != SCHED_NORMAL) || !sched_feat(WAKEUP_PREEMPTION))
                return;

        find_matching_se(&se, &pse);
        update_curr(cfs_rq_of(se));
        BUG_ON(!pse);
        if (wakeup_preempt_entity(se, pse) == 1) {
                /*
                 * Bias pick_next to pick the sched entity that is
                 * triggering this preemption.
                 */
                if (!next_buddy_marked)
                        set_next_buddy(pse);
                goto preempt;
        }

        return;

preempt:
        resched_task(curr);
        /*
         * Only set the backward buddy when the current task is still
         * on the rq. This can happen when a wakeup gets interleaved
         * with schedule on the ->pre_schedule() or idle_balance()
         * point, either of which can * drop the rq lock.
         *
         * Also, during early boot the idle thread is in the fair class,
         * for obvious reasons its a bad idea to schedule back to it.
         */
        if (unlikely(!se->on_rq || curr == rq->idle))
                return;

        if (sched_feat(LAST_BUDDY) && scale && entity_is_task(se))
                set_last_buddy(se);
}

static struct task_struct *pick_next_task_fair(struct rq *rq)
{
        struct task_struct *p;
        struct cfs_rq *cfs_rq = &rq->cfs;
        struct sched_entity *se;

        // in case nr_running!=0 but h_nr_running==0
        if (!cfs_rq->nr_running || !cfs_rq->h_nr_running)
                return NULL;

        do {
                se = pick_next_entity(cfs_rq);
                set_next_entity(cfs_rq, se);
                cfs_rq = group_cfs_rq(se);
        } while (cfs_rq);

        p = task_of(se);
        if (hrtick_enabled(rq))
                hrtick_start_fair(rq, p);

        return p;
}

/*
 * Account for a descheduled task:
 */
static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
{
        struct sched_entity *se = &prev->se;
        struct cfs_rq *cfs_rq;

        for_each_sched_entity(se) {
                cfs_rq = cfs_rq_of(se);
                put_prev_entity(cfs_rq, se);
        }
}

/*
 * sched_yield() is very simple
 *
 * The magic of dealing with the ->skip buddy is in pick_next_entity.
 */
static void yield_task_fair(struct rq *rq)
{
        struct task_struct *curr = rq->curr;
        struct cfs_rq *cfs_rq = task_cfs_rq(curr);
        struct sched_entity *se = &curr->se;

        /*
         * Are we the only task in the tree?
         */
        if (unlikely(rq->nr_running == 1))
                return;

        clear_buddies(cfs_rq, se);

        if (curr->policy != SCHED_BATCH) {
                update_rq_clock(rq);
                /*
                 * Update run-time statistics of the 'current'.
                 */
                update_curr(cfs_rq);
                /*
                 * Tell update_rq_clock() that we've just updated,
                 * so we don't do microscopic update in schedule()
                 * and double the fastpath cost.
                 */
                 rq->skip_clock_update = 1;
        }

        set_skip_buddy(se);
}

static bool yield_to_task_fair(struct rq *rq, struct task_struct *p, bool preempt)
{
        struct sched_entity *se = &p->se;

        /* throttled hierarchies are not runnable */
        if (!se->on_rq || throttled_hierarchy(cfs_rq_of(se)))
                return false;

        /* Tell the scheduler that we'd really like pse to run next. */
        set_next_buddy(se);

        yield_task_fair(rq);

        return true;
}

#ifdef CONFIG_SMP
/**************************************************
 * Fair scheduling class load-balancing methods.
 *
 * BASICS
 *
 * The purpose of load-balancing is to achieve the same basic fairness the
 * per-cpu scheduler provides, namely provide a proportional amount of compute
 * time to each task. This is expressed in the following equation:
 *
 *   W_i,n/P_i == W_j,n/P_j for all i,j                               (1)
 *
 * Where W_i,n is the n-th weight average for cpu i. The instantaneous weight
 * W_i,0 is defined as:
 *
 *   W_i,0 = \Sum_j w_i,j                                             (2)
 *
 * Where w_i,j is the weight of the j-th runnable task on cpu i. This weight
 * is derived from the nice value as per prio_to_weight[].
 *
 * The weight average is an exponential decay average of the instantaneous
 * weight:
 *
 *   W'_i,n = (2^n - 1) / 2^n * W_i,n + 1 / 2^n * W_i,0               (3)
 *
 * P_i is the cpu power (or compute capacity) of cpu i, typically it is the
 * fraction of 'recent' time available for SCHED_OTHER task execution. But it
 * can also include other factors [XXX].
 *
 * To achieve this balance we define a measure of imbalance which follows
 * directly from (1):
 *
 *   imb_i,j = max{ avg(W/P), W_i/P_i } - min{ avg(W/P), W_j/P_j }    (4)
 *
 * We them move tasks around to minimize the imbalance. In the continuous
 * function space it is obvious this converges, in the discrete case we get
 * a few fun cases generally called infeasible weight scenarios.
 *
 * [XXX expand on:
 *     - infeasible weights;
 *     - local vs global optima in the discrete case. ]
 *
 *
 * SCHED DOMAINS
 *
 * In order to solve the imbalance equation (4), and avoid the obvious O(n^2)
 * for all i,j solution, we create a tree of cpus that follows the hardware
 * topology where each level pairs two lower groups (or better). This results
 * in O(log n) layers. Furthermore we reduce the number of cpus going up the
 * tree to only the first of the previous level and we decrease the frequency
 * of load-balance at each level inv. proportional to the number of cpus in
 * the groups.
 *
 * This yields:
 *
 *     log_2 n     1     n
 *   \Sum       { --- * --- * 2^i } = O(n)                            (5)
 *     i = 0      2^i   2^i
 *                               `- size of each group
 *         |         |     `- number of cpus doing load-balance
 *         |         `- freq
 *         `- sum over all levels
 *
 * Coupled with a limit on how many tasks we can migrate every balance pass,
 * this makes (5) the runtime complexity of the balancer.
 *
 * An important property here is that each CPU is still (indirectly) connected
 * to every other cpu in at most O(log n) steps:
 *
 * The adjacency matrix of the resulting graph is given by:
 *
 *             log_2 n     
 *   A_i,j = \Union     (i % 2^k == 0) && i / 2^(k+1) == j / 2^(k+1)  (6)
 *             k = 0
 *
 * And you'll find that:
 *
 *   A^(log_2 n)_i,j != 0  for all i,j                                (7)
 *
 * Showing there's indeed a path between every cpu in at most O(log n) steps.
 * The task movement gives a factor of O(m), giving a convergence complexity
 * of:
 *
 *   O(nm log n),  n := nr_cpus, m := nr_tasks                        (8)
 *
 *
 * WORK CONSERVING
 *
 * In order to avoid CPUs going idle while there's still work to do, new idle
 * balancing is more aggressive and has the newly idle cpu iterate up the domain
 * tree itself instead of relying on other CPUs to bring it work.
 *
 * This adds some complexity to both (5) and (8) but it reduces the total idle
 * time.
 *
 * [XXX more?]
 *
 *
 * CGROUPS
 *
 * Cgroups make a horror show out of (2), instead of a simple sum we get:
 *
 *                                s_k,i
 *   W_i,0 = \Sum_j \Prod_k w_k * -----                               (9)
 *                                 S_k
 *
 * Where
 *
 *   s_k,i = \Sum_j w_i,j,k  and  S_k = \Sum_i s_k,i                 (10)
 *
 * w_i,j,k is the weight of the j-th runnable task in the k-th cgroup on cpu i.
 *
 * The big problem is S_k, its a global sum needed to compute a local (W_i)
 * property.
 *
 * [XXX write more on how we solve this.. _after_ merging pjt's patches that
 *      rewrite all of this once again.]
 */ 

static unsigned long __read_mostly max_load_balance_interval = HZ/10;

#define LBF_ALL_PINNED  0x01
#define LBF_NEED_BREAK  0x02
#define LBF_SOME_PINNED 0x04

struct lb_env {
        struct sched_domain     *sd;

        struct rq               *src_rq;
        int                     src_cpu;

        int                     dst_cpu;
        struct rq               *dst_rq;

        struct cpumask          *dst_grpmask;
        int                     new_dst_cpu;
        enum cpu_idle_type      idle;
        long                    imbalance;
        /* The set of CPUs under consideration for load-balancing */
        struct cpumask          *cpus;

        unsigned int            flags;

        unsigned int            loop;
        unsigned int            loop_break;
        unsigned int            loop_max;
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        int                     mt_check_cache_in_idle;
#endif  
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
        unsigned int            fail_reason;
#endif  
};

/*
 * move_task - move a task from one runqueue to another runqueue.
 * Both runqueues must be locked.
 */
static void move_task(struct task_struct *p, struct lb_env *env)
{
        deactivate_task(env->src_rq, p, 0);
        set_task_cpu(p, env->dst_cpu);
        activate_task(env->dst_rq, p, 0);
        check_preempt_curr(env->dst_rq, p, 0);

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
        if(PA_MON_ENABLE) {
                if(strcmp(p->comm, PA_MON) == 0) {
                        printk(KERN_EMERG "[PA] %s Balance From CPU%d to CPU%d\n", p->comm, env->src_rq->cpu, env->dst_rq->cpu);
                }
        }
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
                
}

/*
 * Is this task likely cache-hot:
 */
#if defined(CONFIG_MT_LOAD_BALANCE_ENHANCEMENT)
static int
task_hot(struct task_struct *p, u64 now, struct sched_domain *sd, int mt_check_cache_in_idle)
#else
static int
task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
#endif
{
        s64 delta;

        if (p->sched_class != &fair_sched_class)
                return 0;

        if (unlikely(p->policy == SCHED_IDLE))
                return 0;

        /*
         * Buddy candidates are cache hot:
         */
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        if (!mt_check_cache_in_idle){
                if ( !this_rq()->nr_running && (task_rq(p)->nr_running >= 2) )
                        return 0;
        }
#endif   
        if (sched_feat(CACHE_HOT_BUDDY) && this_rq()->nr_running &&
                        (&p->se == cfs_rq_of(&p->se)->next ||
                         &p->se == cfs_rq_of(&p->se)->last))
                return 1;

        if (sysctl_sched_migration_cost == -1)
                return 1;
        if (sysctl_sched_migration_cost == 0)
                return 0;

        delta = now - p->se.exec_start;

        return delta < (s64)sysctl_sched_migration_cost;
}

/*
 * can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
 */
static
int can_migrate_task(struct task_struct *p, struct lb_env *env)
{
        int tsk_cache_hot = 0;
        /*
         * We do not migrate tasks that are:
         * 1) throttled_lb_pair, or
         * 2) cannot be migrated to this CPU due to cpus_allowed, or
         * 3) running (obviously), or
         * 4) are cache-hot on their current CPU.
         */
        if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
                return 0;

        if (!cpumask_test_cpu(env->dst_cpu, tsk_cpus_allowed(p))) {
                int cpu;

                schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_AFFINITY);
                if(mt_lbprof_lt (env->sd->mt_lbprof_nr_balance_failed, MT_LBPROF_NR_BALANCED_FAILED_UPPER_BOUND)){
                        char strings[128]="";
                        snprintf(strings, 128, "%d:balance fail:affinity:%d:%d:%s:0x%lu"
                                , env->dst_cpu, env->src_cpu, p->pid, p->comm, p->cpus_allowed.bits[0]);
                        trace_sched_lbprof_log(strings);
                }
#endif          

                /*
                 * Remember if this task can be migrated to any other cpu in
                 * our sched_group. We may want to revisit it if we couldn't
                 * meet load balance goals by pulling other tasks on src_cpu.
                 *
                 * Also avoid computing new_dst_cpu if we have already computed
                 * one in current iteration.
                 */
                if (!env->dst_grpmask || (env->flags & LBF_SOME_PINNED))
                        return 0;

                /* Prevent to re-select dst_cpu via env's cpus */
                for_each_cpu_and(cpu, env->dst_grpmask, env->cpus) {
                        if (cpumask_test_cpu(cpu, tsk_cpus_allowed(p))) {
                                env->flags |= LBF_SOME_PINNED;
                                env->new_dst_cpu = cpu;
                                break;
                        }
                }

                return 0;
        }

        /* Record that we found atleast one task that could run on dst_cpu */
        env->flags &= ~LBF_ALL_PINNED;

        if (task_running(env->src_rq, p)) {
                schedstat_inc(p, se.statistics.nr_failed_migrations_running);
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_RUNNING);
                if( mt_lbprof_lt (env->sd->mt_lbprof_nr_balance_failed, MT_LBPROF_NR_BALANCED_FAILED_UPPER_BOUND)){
                        char strings[128]="";
                        snprintf(strings, 128, "%d:balance fail:running:%d:%d:%s"
                                , env->dst_cpu, env->src_cpu, p->pid, p->comm);
                        trace_sched_lbprof_log(strings);
                }
#endif          
                return 0;
        }

        /*
         * Aggressive migration if:
         * 1) task is cache cold, or
         * 2) too many balance attempts have failed.
         */
#if defined(CONFIG_MT_LOAD_BALANCE_ENHANCEMENT)
        tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd, env->mt_check_cache_in_idle);
#else
        tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd);
#endif 
        if (!tsk_cache_hot ||
                env->sd->nr_balance_failed > env->sd->cache_nice_tries) {

                if (tsk_cache_hot) {
                        schedstat_inc(env->sd, lb_hot_gained[env->idle]);
                        schedstat_inc(p, se.statistics.nr_forced_migrations);
                }

                return 1;
        }

        schedstat_inc(p, se.statistics.nr_failed_migrations_hot);
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
        mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_CACHEHOT);
        if(mt_lbprof_lt (env->sd->mt_lbprof_nr_balance_failed, MT_LBPROF_NR_BALANCED_FAILED_UPPER_BOUND)){
                char strings[128]="";
                snprintf(strings, 128, "%d:balance fail:cache hot:%d:%d:%s"
                        , env->dst_cpu, env->src_cpu, p->pid, p->comm);
                trace_sched_lbprof_log(strings);
        }
#endif          
        return 0;
}

/*
 * move_one_task tries to move exactly one task from busiest to this_rq, as
 * part of active balancing operations within "domain".
 * Returns 1 if successful and 0 otherwise.
 *
 * Called with both runqueues locked.
 */
static int move_one_task(struct lb_env *env)
{
        struct task_struct *p, *n;
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        env->mt_check_cache_in_idle = 1;
#endif
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
        mt_lbprof_stat_set(env->fail_reason, MT_LBPROF_NO_TRIGGER);
#endif

        list_for_each_entry_safe(p, n, &env->src_rq->cfs_tasks, se.group_node) {
#if defined (CONFIG_MTK_SCHED_CMP_LAZY_BALANCE) && !defined(CONFIG_HMP_LAZY_BALANCE)
                if(need_lazy_balance(env->dst_cpu, env->src_cpu, p))
                        continue;
#endif                  
                if (!can_migrate_task(p, env))
                        continue;

                move_task(p, env);
                /*
                 * Right now, this is only the second place move_task()
                 * is called, so we can safely collect move_task()
                 * stats here rather than inside move_task().
                 */
                schedstat_inc(env->sd, lb_gained[env->idle]);
                return 1;
        }
        return 0;
}

static unsigned long task_h_load(struct task_struct *p);

static const unsigned int sched_nr_migrate_break = 32;

/* in second round load balance, we migrate heavy load_weight task
     as long as RT tasks exist in busy cpu*/
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        #define over_imbalance(lw, im) \
                (((lw)/2 > (im)) && \
        ((env->mt_check_cache_in_idle==1) || \
         (env->src_rq->rt.rt_nr_running==0) || \
         (pulled>0)))
#else
        #define over_imbalance(lw, im) (((lw) / 2) > (im))
#endif

/*
 * move_tasks tries to move up to imbalance weighted load from busiest to
 * this_rq, as part of a balancing operation within domain "sd".
 * Returns 1 if successful and 0 otherwise.
 *
 * Called with both runqueues locked.
 */
static int move_tasks(struct lb_env *env)
{
        struct list_head *tasks = &env->src_rq->cfs_tasks;
        struct task_struct *p;
        unsigned long load;
        int pulled = 0;

        if (env->imbalance <= 0)
                return 0;

        mt_sched_printf("move_tasks start ");

        while (!list_empty(tasks)) {
                p = list_first_entry(tasks, struct task_struct, se.group_node);

                env->loop++;
                /* We've more or less seen every task there is, call it quits */
                if (env->loop > env->loop_max)
                        break;

                /* take a breather every nr_migrate tasks */
                if (env->loop > env->loop_break) {
                        env->loop_break += sched_nr_migrate_break;
                        env->flags |= LBF_NEED_BREAK;
                        break;
                }
#if defined (CONFIG_MTK_SCHED_CMP_LAZY_BALANCE) && !defined(CONFIG_HMP_LAZY_BALANCE)
                if(need_lazy_balance(env->dst_cpu, env->src_cpu, p))    
                        goto next;
#endif
                if (!can_migrate_task(p, env))
                        goto next;

                load = task_h_load(p);

                if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed)
                        goto next;

                if (over_imbalance(load, env->imbalance))
                        {
                        goto next;
                        }

                move_task(p, env);
                pulled++;
                env->imbalance -= load;

#ifdef CONFIG_PREEMPT
                /*
                 * NEWIDLE balancing is a source of latency, so preemptible
                 * kernels will stop after the first task is pulled to minimize
                 * the critical section.
                 */
                if (env->idle == CPU_NEWLY_IDLE)
                        break;
#endif

                /*
                 * We only want to steal up to the prescribed amount of
                 * weighted load.
                 */
                if (env->imbalance <= 0)
                        break;

                continue;
next:
                list_move_tail(&p->se.group_node, tasks);
        }

        /*
         * Right now, this is one of only two places move_task() is called,
         * so we can safely collect move_task() stats here rather than
         * inside move_task().
         */
        schedstat_add(env->sd, lb_gained[env->idle], pulled);

        mt_sched_printf("move_tasks end");

        return pulled;
}

#ifdef CONFIG_MTK_SCHED_CMP
#ifdef CONFIG_MTK_SCHED_CMP_TGS
static int cmp_can_migrate_task(struct task_struct *p, struct lb_env *env)
{
        struct sched_domain *sd = env->sd;

        BUG_ON(sd == NULL);

        if (!(sd->flags & SD_BALANCE_TG))
                return 0;

        if (arch_is_multi_cluster()) {
                int src_clid, dst_clid;
                int src_nr_cpus;
                struct thread_group_info_t *src_tginfo, *dst_tginfo;

                src_clid = get_cluster_id(env->src_cpu);
                dst_clid = get_cluster_id(env->dst_cpu);
                BUG_ON(dst_clid == -1 || src_clid == -1);
                BUG_ON(p == NULL || p->group_leader == NULL);
                src_tginfo = &p->group_leader->thread_group_info[src_clid];
                dst_tginfo = &p->group_leader->thread_group_info[dst_clid];
                src_nr_cpus = nr_cpus_in_cluster(src_clid, false);

#ifdef CONFIG_MT_SCHED_INFO
                mt_sched_printf("check rule0: pid=%d comm=%s load=%ld src:clid=%d tginfo->nr_running=%ld nr_cpus=%d load_avg_ratio=%ld",
                        p->pid, p->comm, p->se.avg.load_avg_ratio,
                        src_clid, src_tginfo->nr_running, src_nr_cpus,
                        src_tginfo->load_avg_ratio);
#endif
#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
                if ( (!thread_group_empty(p)) &&
                         (src_tginfo->nr_running <= src_nr_cpus) &&
                         (src_tginfo->nr_running > dst_tginfo->nr_running)){
                        mt_sched_printf("hit ruleA: bypass pid=%d comm=%s src:nr_running=%lu nr_cpus=%d dst:nr_running=%lu",
                                p->pid, p->comm, src_tginfo->nr_running, src_nr_cpus, dst_tginfo->nr_running);
                        return 0;
                }
#endif
        }
        return 1;
}

static int need_migrate_task_immediately(struct task_struct *p,
           struct lb_env *env, struct clb_env *clbenv)
{
        struct sched_domain *sd = env->sd;

        BUG_ON(sd == NULL);

        if (arch_is_big_little()) {
                mt_sched_printf("[%s] b.L arch", __func__);
#ifdef CONFIG_MT_SCHED_INFO
                mt_sched_printf("check rule0: pid=%d comm=%s src=%d dst=%d p->prio=%d p->se.avg.load_avg_ratio=%ld",
                        p->pid, p->comm, env->src_cpu, env->dst_cpu, p->prio, p->se.avg.load_avg_ratio);
#endif
                /* from LITTLE to big */
                if (arch_cpu_is_little(env->src_cpu) && arch_cpu_is_big(env->dst_cpu)) {
                        BUG_ON(env->src_cpu != clbenv->ltarget);
                        if (p->se.avg.load_avg_ratio >= clbenv->bstats.threshold)
                                return 1;

                /* from big to LITTLE */
                } else if (arch_cpu_is_big(env->src_cpu) && arch_cpu_is_little(env->dst_cpu)) {
                        BUG_ON(env->src_cpu != clbenv->btarget);
                        if (p->se.avg.load_avg_ratio < clbenv->lstats.threshold)
                                return 1;
                }
                return 0;
        }

        if (arch_is_multi_cluster() && (sd->flags & SD_BALANCE_TG)) {
                int src_clid, dst_clid;
                int src_nr_cpus;
                struct thread_group_info_t *src_tginfo, *dst_tginfo;

                src_clid = get_cluster_id(env->src_cpu);
                dst_clid = get_cluster_id(env->dst_cpu);
                BUG_ON(dst_clid == -1 || src_clid == -1);
                BUG_ON(p == NULL || p->group_leader == NULL);
                src_tginfo = &p->group_leader->thread_group_info[src_clid];
                dst_tginfo = &p->group_leader->thread_group_info[dst_clid];
                src_nr_cpus = nr_cpus_in_cluster(src_clid, false);
                mt_sched_printf("[%s] L.L arch", __func__);

                if ((p->se.avg.load_avg_ratio*4  >=  NICE_0_LOAD*3) &&
                        src_tginfo->nr_running > src_nr_cpus &&
                        src_tginfo->load_avg_ratio*10 > NICE_0_LOAD*src_nr_cpus*9) {
                        //pr_warn("[%s] hit rule0, candidate_load_move/load_move (%ld/%ld)\n",
                        //      __func__, candidate_load_move, env->imbalance);
                        return 1;
                }
        }

        return 0;
}
#endif

/*
 * move_tasks tries to move up to load_move weighted load from busiest to
 * this_rq, as part of a balancing operation within domain "sd".
 * Returns 1 if successful and 0 otherwise.
 *
 * Called with both runqueues locked.
 */
static int cmp_move_tasks(struct sched_domain *sd, struct lb_env *env)
{
        struct list_head *tasks = &env->src_rq->cfs_tasks;
        struct task_struct *p;
        unsigned long load = 0;
        int pulled = 0;

        long tg_load_move, other_load_move;
        struct list_head tg_tasks, other_tasks;
        int src_clid, dst_clid;
#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
        struct cpumask tmp, *cpus = &tmp;
#endif
#ifdef MTK_QUICK 
        int flag = 0;
#endif
        struct clb_env clbenv;
        struct cpumask srcmask, dstmask;

        if (env->imbalance <= 0)
                return 0;

        other_load_move = env->imbalance;
        INIT_LIST_HEAD(&other_tasks);

//      if (sd->flags & SD_BALANCE_TG) {
                tg_load_move = env->imbalance;
                INIT_LIST_HEAD(&tg_tasks);
                src_clid = get_cluster_id(env->src_cpu);
                dst_clid = get_cluster_id(env->dst_cpu);
                BUG_ON(dst_clid == -1 || src_clid == -1);

#ifdef CONFIG_MTK_SCHED_CMP_TGS_WAKEUP
                get_cluster_cpus(cpus, src_clid, true);
#endif
                mt_sched_printf("move_tasks_tg start: src:cpu=%d clid=%d runnable_load=%lu dst:cpu=%d clid=%d runnable_load=%lu imbalance=%ld curr->on_rq=%d",
                        env->src_cpu, src_clid, cpu_rq(env->src_cpu)->cfs.runnable_load_avg,
                        env->dst_cpu, dst_clid, cpu_rq(env->dst_cpu)->cfs.runnable_load_avg,
                        env->imbalance, env->dst_rq->curr->on_rq);
//      }

        mt_sched_printf("max=%d busiest->nr_running=%d",
                env->loop_max, cpu_rq(env->src_cpu)->nr_running);

        if (arch_is_big_little()) {
                get_cluster_cpus(&srcmask, src_clid, true);
                get_cluster_cpus(&dstmask, dst_clid, true);
                memset(&clbenv, 0, sizeof(clbenv));
                clbenv.flags |= HMP_LB;
                clbenv.ltarget = arch_cpu_is_little(env->src_cpu) ? env->src_cpu : env->dst_cpu;
                clbenv.btarget = arch_cpu_is_big(env->src_cpu) ? env->src_cpu : env->dst_cpu;
                clbenv.lcpus = arch_cpu_is_little(env->src_cpu) ? &srcmask : &dstmask;
                clbenv.bcpus = arch_cpu_is_big(env->src_cpu) ? &srcmask : &dstmask;
                sched_update_clbstats(&clbenv);
        }

        while (!list_empty(tasks)) {
                struct thread_group_info_t *src_tginfo, *dst_tginfo;

                p = list_first_entry(tasks, struct task_struct, se.group_node);

#ifdef CONFIG_MT_SCHED_INFO
                mt_sched_printf("check: pid=%d comm=%s load_avg_contrib=%lu h_load=%lu runnable_load_avg=%lu loop=%d, env->imbalance=%ld tg_load_move=%ld",
                        p->pid, p->comm, p->se.avg.load_avg_contrib,
                        task_cfs_rq(p)->h_load, task_cfs_rq(p)->runnable_load_avg,
                        env->loop, env->imbalance, tg_load_move);
#endif
                env->loop++;
                /* We've more or less seen every task there is, call it quits */
                if (env->loop > env->loop_max)
                        break;

#if 0 // TO check
                /* take a breather every nr_migrate tasks */
                if (env->loop > env->loop_break) {
                        env->loop_break += sched_nr_migrate_break;
                        env->flags |= LBF_NEED_BREAK;
                        break;
                }
#endif
                BUG_ON(p == NULL || p->group_leader == NULL);
                src_tginfo = &p->group_leader->thread_group_info[src_clid];
                dst_tginfo = &p->group_leader->thread_group_info[dst_clid];

                /* rule0 */
                if (!can_migrate_task(p, env)) {
                        mt_sched_printf("can not migrate: pid=%d comm=%s",
                                p->pid, p->comm);
                        goto next;
                }

                load = task_h_load(p);

                if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed) {
                        mt_sched_printf("can not migrate: pid=%d comm=%s sched_feat",
                                p->pid, p->comm );
                        goto next;
                }

                if (over_imbalance(load, env->imbalance)) {
                        mt_sched_printf("can not migrate: pid=%d comm=%s load=%ld imbalance=%ld",
                                p->pid, p->comm, load, env->imbalance );
                        goto next;
                }

                /* meet rule0 , migrate immediately */
                if (need_migrate_task_immediately(p, env, &clbenv)) {
                        pulled++;
                        env->imbalance -= load;
                        tg_load_move -= load;
                        other_load_move -= load;
                        mt_sched_printf("hit rule0: pid=%d comm=%s load=%ld imbalance=%ld tg_imbalance=%ld other_load_move=%ld",
                                p->pid, p->comm, load, env->imbalance, tg_load_move, other_load_move);
                        move_task(p, env);
                        if (env->imbalance <= 0)
                                break;
                        continue;
                }

                /* for TGS */
                if (!cmp_can_migrate_task(p, env))
                        goto next;

                if (sd->flags & SD_BALANCE_TG){
                        if (over_imbalance(load, tg_load_move)) {
                                mt_sched_printf("can not migrate: pid=%d comm=%s load=%ld imbalance=%ld",
                                        p->pid, p->comm, load, tg_load_move );
                                goto next;
                        }

#ifdef MTK_QUICK 
                        if (candidate_load_move <= 0) {
                                mt_sched_printf("check: pid=%d comm=%s candidate_load_move=%d",
                                        p->pid, p->comm, candidate_load_move);
                                goto next;
                        }
#endif

                        /* rule1, single thread */
#ifdef CONFIG_MT_SCHED_INFO
                        mt_sched_printf("check rule1: pid=%d p->comm=%s thread_group_cnt=%lu thread_group_empty(p)=%d",
                                p->pid, p->comm, 
                                p->group_leader->thread_group_info[0].nr_running + 
                                p->group_leader->thread_group_info[1].nr_running, 
                                thread_group_empty(p));
#endif

                        if (thread_group_empty(p)) {
                                list_move_tail(&p->se.group_node, &tg_tasks);
                                tg_load_move -= load;
                                other_load_move -= load;
                                mt_sched_printf("hit rule1: pid=%d p->comm=%s load=%ld tg_imbalance=%ld",
                                   p->pid, p->comm, load, tg_load_move);
                                continue;
                        }

                        /* rule2 */
#ifdef CONFIG_MT_SCHED_INFO
                        mt_sched_printf("check rule2: pid=%d p->comm=%s %ld, %ld, %ld, %ld, %ld",
                                p->pid, p->comm, src_tginfo->nr_running, src_tginfo->cfs_nr_running, dst_tginfo->nr_running, 
                                p->se.avg.load_avg_ratio, src_tginfo->load_avg_ratio);
#endif
                        if ((src_tginfo->nr_running < dst_tginfo->nr_running) &&
                           ((p->se.avg.load_avg_ratio * src_tginfo->cfs_nr_running) <= 
                            src_tginfo->load_avg_ratio)) {
                                list_move_tail(&p->se.group_node, &tg_tasks);
                                tg_load_move -= load;
                                other_load_move -= load;
                                mt_sched_printf("hit rule2: pid=%d p->comm=%s load=%ld tg_imbalance=%ld",
                                   p->pid, p->comm, load, tg_load_move);
                                continue;
                        }

                        if (over_imbalance(load, other_load_move))
                                goto next;
/*
                        if (other_load_move <= 0)
                                goto next;
*/

                        list_move_tail(&p->se.group_node, &other_tasks);
                        other_load_move -= load;
                        continue;
                }else{
                        list_move_tail(&p->se.group_node, &other_tasks);
                        other_load_move -= load;
                        continue;
                }

        // ytchang
#if defined (CONFIG_MTK_SCHED_CMP_LAZY_BALANCE) && !defined(CONFIG_HMP_LAZY_BALANCE)
                if(need_lazy_balance(env->dst_cpu, env->src_cpu, p))
                        goto next;
#endif

next:
                /* original rule */
                list_move_tail(&p->se.group_node, tasks);
        } // end of while()

        if ( sd->flags & SD_BALANCE_TG){
                while (!list_empty(&tg_tasks)) {
                        p = list_first_entry(&tg_tasks, struct task_struct, se.group_node);
                        list_move_tail(&p->se.group_node, tasks);

                        if (env->imbalance > 0) {
                                load = task_h_load(p);
                                if (over_imbalance(load, env->imbalance)){
                                        mt_sched_printf("overload rule1,2: pid=%d p->comm=%s load=%ld imbalance=%ld",
                                           p->pid, p->comm, load, env->imbalance);
#ifdef MTK_QUICK 

                                        flag=1;
#endif
                                        continue;
                                }

                                move_task(p, env);
                                env->imbalance -= load;
                                pulled++;

                                mt_sched_printf("migrate hit rule1,2: pid=%d p->comm=%s load=%ld imbalance=%ld",
                                   p->pid, p->comm, load, env->imbalance);
                        }
                }
        }

        mt_sched_printf("move_tasks_tg finish rule migrate");

        while (!list_empty(&other_tasks)) {
                p = list_first_entry(&other_tasks, struct task_struct, se.group_node);
                list_move_tail(&p->se.group_node, tasks);

#ifdef MTK_QUICK
                if (!flag && (env->imbalance > 0)) {
#else
                if (env->imbalance > 0) {
#endif
                        load = task_h_load(p);

                        if (over_imbalance(load, env->imbalance)){
                                mt_sched_printf("overload others: pid=%d p->comm=%s load=%ld imbalance=%ld",
                                   p->pid, p->comm, load, env->imbalance);
                                continue;
                        }

                        move_task(p, env);
                        env->imbalance -= load;
                        pulled++;

                        mt_sched_printf("migrate others: pid=%d p->comm=%s load=%ld imbalance=%ld",
                           p->pid, p->comm, load, env->imbalance);
                }
        }

        /*
         * Right now, this is one of only two places move_task() is called,
         * so we can safely collect move_task() stats here rather than
         * inside move_task().
         */
        schedstat_add(env->sd, lb_gained[env->idle], pulled);

        mt_sched_printf("move_tasks_tg finish pulled=%d imbalance=%ld", pulled, env->imbalance);

        return pulled;
}

#endif /* CONFIG_MTK_SCHED_CMP */


#if defined (CONFIG_MTK_SCHED_CMP_LAZY_BALANCE) && !defined(CONFIG_HMP_LAZY_BALANCE)
static int need_lazy_balance(int dst_cpu, int src_cpu, struct task_struct *p)
{
                /* Lazy balnace for small task
                1. src cpu is buddy cpu
                2. src cpu is not busy cpu
                3. p is light task
                */      
#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER              
                if ( PA_ENABLE && cpumask_test_cpu(src_cpu, &buddy_cpu_map) &&
                        !is_buddy_busy(src_cpu) && is_light_task(p)) {
#else
                if (cpumask_test_cpu(src_cpu, &buddy_cpu_map) &&
                        !is_buddy_busy(src_cpu) && is_light_task(p)) {
#endif
#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER
                        unsigned int i;
                        AVOID_LOAD_BALANCE_FROM_CPUX_TO_CPUY_COUNT[src_cpu][dst_cpu]++;
                        mt_sched_printf("[PA]pid=%d, Lazy balance from CPU%d to CPU%d\n)\n", p->pid, src_cpu, dst_cpu);
                        for(i=0;i<4;i++) {
                                if(PA_MON_ENABLE && (strcmp(p->comm, &PA_MON[i][0]) == 0)) {
                                        printk(KERN_EMERG "[PA] %s Lazy balance from CPU%d to CPU%d\n", p->comm, src_cpu, dst_cpu);
        //                              printk(KERN_EMERG "[PA]   src_cpu RQ Usage = %u, Period = %u, NR = %u\n", 
        //                                                                                                              per_cpu(BUDDY_CPU_RQ_USAGE, src_cpu),
        //                                                                                                              per_cpu(BUDDY_CPU_RQ_PERIOD, src_cpu),
        //                                                                                                              per_cpu(BUDDY_CPU_RQ_NR, src_cpu));
        //                              printk(KERN_EMERG "[PA]   Task Usage = %u, Period = %u\n", 
        //                                                                                                              p->se.avg.usage_avg_sum,
        //                                                                                                              p->se.avg.runnable_avg_period);
                                }
                        }
#endif          
                        return 1;
                }
                else
                        return 0;
}
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
/*
 * update tg->load_weight by folding this cpu's load_avg
 */
static void __update_blocked_averages_cpu(struct task_group *tg, int cpu)
{
        struct sched_entity *se = tg->se[cpu];
        struct cfs_rq *cfs_rq = tg->cfs_rq[cpu];

        /* throttled entities do not contribute to load */
        if (throttled_hierarchy(cfs_rq))
                return;

        update_cfs_rq_blocked_load(cfs_rq, 1);

        if (se) {
                update_entity_load_avg(se, 1);
                /*
                 * We pivot on our runnable average having decayed to zero for
                 * list removal.  This generally implies that all our children
                 * have also been removed (modulo rounding error or bandwidth
                 * control); however, such cases are rare and we can fix these
                 * at enqueue.
                 *
                 * TODO: fix up out-of-order children on enqueue.
                 */
                if (!se->avg.runnable_avg_sum && !cfs_rq->nr_running)
                        list_del_leaf_cfs_rq(cfs_rq);
        } else {
                struct rq *rq = rq_of(cfs_rq);
                update_rq_runnable_avg(rq, rq->nr_running);
        }
}

static void update_blocked_averages(int cpu)
{
        struct rq *rq = cpu_rq(cpu);
        struct cfs_rq *cfs_rq;
        unsigned long flags;

        raw_spin_lock_irqsave(&rq->lock, flags);
        update_rq_clock(rq);
        /*
         * Iterates the task_group tree in a bottom up fashion, see
         * list_add_leaf_cfs_rq() for details.
         */
        for_each_leaf_cfs_rq(rq, cfs_rq) {
                /*
                 * Note: We may want to consider periodically releasing
                 * rq->lock about these updates so that creating many task
                 * groups does not result in continually extending hold time.
                 */
                __update_blocked_averages_cpu(cfs_rq->tg, rq->cpu);
        }

        raw_spin_unlock_irqrestore(&rq->lock, flags);
}

/*
 * Compute the cpu's hierarchical load factor for each task group.
 * This needs to be done in a top-down fashion because the load of a child
 * group is a fraction of its parents load.
 */
static int tg_load_down(struct task_group *tg, void *data)
{
        unsigned long load;
        long cpu = (long)data;

        if (!tg->parent) {
                /*
                 * rq's sched_avg is not updated accordingly. adopt rq's
                 * corresponding cfs_rq runnable loading instead.
                 *
                 * a003a25b sched: Consider runnable load average...
                 *

                load = cpu_rq(cpu)->avg.load_avg_contrib;

                 */
                load = cpu_rq(cpu)->cfs.runnable_load_avg;
        } else {
                load = tg->parent->cfs_rq[cpu]->h_load;
                load = div64_ul(load * tg->se[cpu]->avg.load_avg_contrib,
                                tg->parent->cfs_rq[cpu]->runnable_load_avg + 1);
        }

        tg->cfs_rq[cpu]->h_load = load;

        return 0;
}

static void update_h_load(long cpu)
{
        rcu_read_lock();
        walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
        rcu_read_unlock();
}

static unsigned long task_h_load(struct task_struct *p)
{
        struct cfs_rq *cfs_rq = task_cfs_rq(p);

        return div64_ul(p->se.avg.load_avg_contrib * cfs_rq->h_load,
                        cfs_rq->runnable_load_avg + 1);
}
#else
static inline void update_blocked_averages(int cpu)
{
}

static inline void update_h_load(long cpu)
{
}

static unsigned long task_h_load(struct task_struct *p)
{
        return p->se.avg.load_avg_contrib;
}
#endif

/********** Helpers for find_busiest_group ************************/
/*
 * sd_lb_stats - Structure to store the statistics of a sched_domain
 *              during load balancing.
 */
struct sd_lb_stats {
        struct sched_group *busiest; /* Busiest group in this sd */
        struct sched_group *this;  /* Local group in this sd */
        unsigned long total_load;  /* Total load of all groups in sd */
        unsigned long total_pwr;   /*   Total power of all groups in sd */
        unsigned long avg_load;    /* Average load across all groups in sd */

        /** Statistics of this group */
        unsigned long this_load;
        unsigned long this_load_per_task;
        unsigned long this_nr_running;
        unsigned long this_has_capacity;
        unsigned int  this_idle_cpus;

        /* Statistics of the busiest group */
        unsigned int  busiest_idle_cpus;
        unsigned long max_load;
        unsigned long busiest_load_per_task;
        unsigned long busiest_nr_running;
        unsigned long busiest_group_capacity;
        unsigned long busiest_has_capacity;
        unsigned int  busiest_group_weight;

        int group_imb; /* Is there imbalance in this sd */
};

/*
 * sg_lb_stats - stats of a sched_group required for load_balancing
 */
struct sg_lb_stats {
        unsigned long avg_load; /*Avg load across the CPUs of the group */
        unsigned long group_load; /* Total load over the CPUs of the group */
        unsigned long sum_nr_running; /* Nr tasks running in the group */
        unsigned long sum_weighted_load; /* Weighted load of group's tasks */
        unsigned long group_capacity;
        unsigned long idle_cpus;
        unsigned long group_weight;
        int group_imb; /* Is there an imbalance in the group ? */
        int group_has_capacity; /* Is there extra capacity in the group? */
};

/**
 * get_sd_load_idx - Obtain the load index for a given sched domain.
 * @sd: The sched_domain whose load_idx is to be obtained.
 * @idle: The Idle status of the CPU for whose sd load_icx is obtained.
 */
static inline int get_sd_load_idx(struct sched_domain *sd,
                                        enum cpu_idle_type idle)
{
        int load_idx;

        switch (idle) {
        case CPU_NOT_IDLE:
                load_idx = sd->busy_idx;
                break;

        case CPU_NEWLY_IDLE:
                load_idx = sd->newidle_idx;
                break;
        default:
                load_idx = sd->idle_idx;
                break;
        }

        return load_idx;
}

static unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
{
        return SCHED_POWER_SCALE;
}

unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)
{
        return default_scale_freq_power(sd, cpu);
}

static unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu)
{
        unsigned long weight = sd->span_weight;
        unsigned long smt_gain = sd->smt_gain;

        smt_gain /= weight;

        return smt_gain;
}

unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)
{
        return default_scale_smt_power(sd, cpu);
}

static unsigned long scale_rt_power(int cpu)
{
        struct rq *rq = cpu_rq(cpu);
        u64 total, available, age_stamp, avg;

        /*
         * Since we're reading these variables without serialization make sure
         * we read them once before doing sanity checks on them.
         */
        age_stamp = ACCESS_ONCE(rq->age_stamp);
        avg = ACCESS_ONCE(rq->rt_avg);

        total = sched_avg_period() + (rq->clock - age_stamp);

        if (unlikely(total < avg)) {
                /* Ensures that power won't end up being negative */
                available = 0;
        } else {
                available = total - avg;
        }

        if (unlikely((s64)total < SCHED_POWER_SCALE))
                total = SCHED_POWER_SCALE;

        total >>= SCHED_POWER_SHIFT;

        return div_u64(available, total);
}

static void update_cpu_power(struct sched_domain *sd, int cpu)
{
        unsigned long weight = sd->span_weight;
        unsigned long power = SCHED_POWER_SCALE;
        struct sched_group *sdg = sd->groups;

        if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
                if (sched_feat(ARCH_POWER))
                        power *= arch_scale_smt_power(sd, cpu);
                else
                        power *= default_scale_smt_power(sd, cpu);

                power >>= SCHED_POWER_SHIFT;
        }

        sdg->sgp->power_orig = power;

        if (sched_feat(ARCH_POWER))
                power *= arch_scale_freq_power(sd, cpu);
        else
                power *= default_scale_freq_power(sd, cpu);

        power >>= SCHED_POWER_SHIFT;

        power *= scale_rt_power(cpu);
        power >>= SCHED_POWER_SHIFT;

        if (!power)
                power = 1;

        cpu_rq(cpu)->cpu_power = power;
        sdg->sgp->power = power;
}

void update_group_power(struct sched_domain *sd, int cpu)
{
        struct sched_domain *child = sd->child;
        struct sched_group *group, *sdg = sd->groups;
        unsigned long power;
        unsigned long interval;

        interval = msecs_to_jiffies(sd->balance_interval);
        interval = clamp(interval, 1UL, max_load_balance_interval);
        sdg->sgp->next_update = jiffies + interval;

        if (!child) {
                update_cpu_power(sd, cpu);
                return;
        }

        power = 0;

        if (child->flags & SD_OVERLAP) {
                /*
                 * SD_OVERLAP domains cannot assume that child groups
                 * span the current group.
                 */

                for_each_cpu(cpu, sched_group_cpus(sdg))
                        power += power_of(cpu);
        } else  {
                /*
                 * !SD_OVERLAP domains can assume that child groups
                 * span the current group.
                 */ 

                group = child->groups;
                do {
                        power += group->sgp->power;
                        group = group->next;
                } while (group != child->groups);
        }

        sdg->sgp->power_orig = sdg->sgp->power = power;
}

/*
 * Try and fix up capacity for tiny siblings, this is needed when
 * things like SD_ASYM_PACKING need f_b_g to select another sibling
 * which on its own isn't powerful enough.
 *
 * See update_sd_pick_busiest() and check_asym_packing().
 */
static inline int
fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
{
        /*
         * Only siblings can have significantly less than SCHED_POWER_SCALE
         */
        if (!(sd->flags & SD_SHARE_CPUPOWER))
                return 0;

        /*
         * If ~90% of the cpu_power is still there, we're good.
         */
        if (group->sgp->power * 32 > group->sgp->power_orig * 29)
                return 1;

        return 0;
}

/**
 * update_sg_lb_stats - Update sched_group's statistics for load balancing.
 * @env: The load balancing environment.
 * @group: sched_group whose statistics are to be updated.
 * @load_idx: Load index of sched_domain of this_cpu for load calc.
 * @local_group: Does group contain this_cpu.
 * @balance: Should we balance.
 * @sgs: variable to hold the statistics for this group.
 */
static inline void update_sg_lb_stats(struct lb_env *env,
                        struct sched_group *group, int load_idx,
                        int local_group, int *balance, struct sg_lb_stats *sgs)
{
        unsigned long nr_running, max_nr_running, min_nr_running;
        unsigned long load, max_cpu_load, min_cpu_load;
        unsigned int balance_cpu = -1, first_idle_cpu = 0;
        unsigned long avg_load_per_task = 0;
        int i;

        if (local_group)
                balance_cpu = group_balance_cpu(group);

        /* Tally up the load of all CPUs in the group */
        max_cpu_load = 0;
        min_cpu_load = ~0UL;
        max_nr_running = 0;
        min_nr_running = ~0UL;

        for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
                struct rq *rq = cpu_rq(i);

                nr_running = rq->nr_running;

                /* Bias balancing toward cpus of our domain */
                if (local_group) {
                        if (idle_cpu(i) && !first_idle_cpu &&
                                        cpumask_test_cpu(i, sched_group_mask(group))) {
                                first_idle_cpu = 1;
                                balance_cpu = i;
                        }

                        load = target_load(i, load_idx);
                } else {
                        load = source_load(i, load_idx);
                        if (load > max_cpu_load)
                                max_cpu_load = load;
                        if (min_cpu_load > load)
                                min_cpu_load = load;

                        if (nr_running > max_nr_running)
                                max_nr_running = nr_running;
                        if (min_nr_running > nr_running)
                                min_nr_running = nr_running;

#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER  
                        if((load_idx > 0) && (load == cpu_rq(i)->cpu_load[load_idx-1]))
                                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_HISTORY);
#endif
                }

                sgs->group_load += load;
                sgs->sum_nr_running += nr_running;
                sgs->sum_weighted_load += weighted_cpuload(i);
                if (idle_cpu(i))
                        sgs->idle_cpus++;
        }

        /*
         * First idle cpu or the first cpu(busiest) in this sched group
         * is eligible for doing load balancing at this and above
         * domains. In the newly idle case, we will allow all the cpu's
         * to do the newly idle load balance.
         */
        if (local_group) {
                if (env->idle != CPU_NEWLY_IDLE) {
                        if (balance_cpu != env->dst_cpu) {
                                *balance = 0;
                                return;
                        }
                        update_group_power(env->sd, env->dst_cpu);
                } else if (time_after_eq(jiffies, group->sgp->next_update))
                        update_group_power(env->sd, env->dst_cpu);
        }

        /* Adjust by relative CPU power of the group */
        sgs->avg_load = (sgs->group_load*SCHED_POWER_SCALE) / group->sgp->power;

        /*
         * Consider the group unbalanced when the imbalance is larger
         * than the average weight of a task.
         *
         * APZ: with cgroup the avg task weight can vary wildly and
         *      might not be a suitable number - should we keep a
         *      normalized nr_running number somewhere that negates
         *      the hierarchy?
         */
        if (sgs->sum_nr_running)
                avg_load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;

        if ((max_cpu_load - min_cpu_load) >= avg_load_per_task &&
            (max_nr_running - min_nr_running) > 1)
                sgs->group_imb = 1;

        sgs->group_capacity = DIV_ROUND_CLOSEST(group->sgp->power,
                                                SCHED_POWER_SCALE);
        if (!sgs->group_capacity)
                sgs->group_capacity = fix_small_capacity(env->sd, group);
        sgs->group_weight = group->group_weight;

        if (sgs->group_capacity > sgs->sum_nr_running)
                sgs->group_has_capacity = 1;
}

/**
 * update_sd_pick_busiest - return 1 on busiest group
 * @env: The load balancing environment.
 * @sds: sched_domain statistics
 * @sg: sched_group candidate to be checked for being the busiest
 * @sgs: sched_group statistics
 *
 * Determine if @sg is a busier group than the previously selected
 * busiest group.
 */
static bool update_sd_pick_busiest(struct lb_env *env,
                                   struct sd_lb_stats *sds,
                                   struct sched_group *sg,
                                   struct sg_lb_stats *sgs)
{
        if (sgs->avg_load <= sds->max_load) {
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_PICK_BUSIEST_FAIL_1);
                return false;
        }               

        if (sgs->sum_nr_running > sgs->group_capacity)
                return true;

        if (sgs->group_imb)
                return true;

        /*
         * ASYM_PACKING needs to move all the work to the lowest
         * numbered CPUs in the group, therefore mark all groups
         * higher than ourself as busy.
         */
        if ((env->sd->flags & SD_ASYM_PACKING) && sgs->sum_nr_running &&
            env->dst_cpu < group_first_cpu(sg)) {
                if (!sds->busiest)
                        return true;

                if (group_first_cpu(sds->busiest) > group_first_cpu(sg))
                        return true;
        }

        mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_PICK_BUSIEST_FAIL_2);
        return false;
}

/**
 * update_sd_lb_stats - Update sched_domain's statistics for load balancing.
 * @env: The load balancing environment.
 * @balance: Should we balance.
 * @sds: variable to hold the statistics for this sched_domain.
 */
static inline void update_sd_lb_stats(struct lb_env *env,
                                        int *balance, struct sd_lb_stats *sds)
{
        struct sched_domain *child = env->sd->child;
        struct sched_group *sg = env->sd->groups;
        struct sg_lb_stats sgs;
        int load_idx, prefer_sibling = 0;

        if (child && child->flags & SD_PREFER_SIBLING)
                prefer_sibling = 1;

        load_idx = get_sd_load_idx(env->sd, env->idle);

        do {
                int local_group;

                local_group = cpumask_test_cpu(env->dst_cpu, sched_group_cpus(sg));
                memset(&sgs, 0, sizeof(sgs));
                update_sg_lb_stats(env, sg, load_idx, local_group, balance, &sgs);

                if (local_group && !(*balance))
                        return;

                sds->total_load += sgs.group_load;
                sds->total_pwr += sg->sgp->power;

                /*
                 * In case the child domain prefers tasks go to siblings
                 * first, lower the sg capacity to one so that we'll try
                 * and move all the excess tasks away. We lower the capacity
                 * of a group only if the local group has the capacity to fit
                 * these excess tasks, i.e. nr_running < group_capacity. The
                 * extra check prevents the case where you always pull from the
                 * heaviest group when it is already under-utilized (possible
                 * with a large weight task outweighs the tasks on the system).
                 */
                if (prefer_sibling && !local_group && sds->this_has_capacity)
                        sgs.group_capacity = min(sgs.group_capacity, 1UL);

                if (local_group) {
                        sds->this_load = sgs.avg_load;
                        sds->this = sg;
                        sds->this_nr_running = sgs.sum_nr_running;
                        sds->this_load_per_task = sgs.sum_weighted_load;
                        sds->this_has_capacity = sgs.group_has_capacity;
                        sds->this_idle_cpus = sgs.idle_cpus;
                } else if (update_sd_pick_busiest(env, sds, sg, &sgs)) {
                        sds->max_load = sgs.avg_load;
                        sds->busiest = sg;
                        sds->busiest_nr_running = sgs.sum_nr_running;
                        sds->busiest_idle_cpus = sgs.idle_cpus;
                        sds->busiest_group_capacity = sgs.group_capacity;
                        sds->busiest_load_per_task = sgs.sum_weighted_load;
                        sds->busiest_has_capacity = sgs.group_has_capacity;
                        sds->busiest_group_weight = sgs.group_weight;
                        sds->group_imb = sgs.group_imb;
                }

                sg = sg->next;
        } while (sg != env->sd->groups);
}

/**
 * check_asym_packing - Check to see if the group is packed into the
 *                      sched doman.
 *
 * This is primarily intended to used at the sibling level.  Some
 * cores like POWER7 prefer to use lower numbered SMT threads.  In the
 * case of POWER7, it can move to lower SMT modes only when higher
 * threads are idle.  When in lower SMT modes, the threads will
 * perform better since they share less core resources.  Hence when we
 * have idle threads, we want them to be the higher ones.
 *
 * This packing function is run on idle threads.  It checks to see if
 * the busiest CPU in this domain (core in the P7 case) has a higher
 * CPU number than the packing function is being run on.  Here we are
 * assuming lower CPU number will be equivalent to lower a SMT thread
 * number.
 *
 * Returns 1 when packing is required and a task should be moved to
 * this CPU.  The amount of the imbalance is returned in *imbalance.
 *
 * @env: The load balancing environment.
 * @sds: Statistics of the sched_domain which is to be packed
 */
static int check_asym_packing(struct lb_env *env, struct sd_lb_stats *sds)
{
        int busiest_cpu;

        if (!(env->sd->flags & SD_ASYM_PACKING))
                return 0;

        if (!sds->busiest)
                return 0;

        busiest_cpu = group_first_cpu(sds->busiest);
        if (env->dst_cpu > busiest_cpu)
                return 0;

        env->imbalance = DIV_ROUND_CLOSEST(
                sds->max_load * sds->busiest->sgp->power, SCHED_POWER_SCALE);

        return 1;
}

/**
 * fix_small_imbalance - Calculate the minor imbalance that exists
 *                      amongst the groups of a sched_domain, during
 *                      load balancing.
 * @env: The load balancing environment.
 * @sds: Statistics of the sched_domain whose imbalance is to be calculated.
 */
static inline
void fix_small_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
{
        unsigned long tmp, pwr_now = 0, pwr_move = 0;
        unsigned int imbn = 2;
        unsigned long scaled_busy_load_per_task;

        if (sds->this_nr_running) {
                sds->this_load_per_task /= sds->this_nr_running;
                if (sds->busiest_load_per_task >
                                sds->this_load_per_task)
                        imbn = 1;
        } else {
                sds->this_load_per_task =
                        cpu_avg_load_per_task(env->dst_cpu);
        }

        scaled_busy_load_per_task = sds->busiest_load_per_task
                                         * SCHED_POWER_SCALE;
        scaled_busy_load_per_task /= sds->busiest->sgp->power;

        if (sds->max_load - sds->this_load + scaled_busy_load_per_task >=
                        (scaled_busy_load_per_task * imbn)) {
                env->imbalance = sds->busiest_load_per_task;
                return;
        }

        /*
         * OK, we don't have enough imbalance to justify moving tasks,
         * however we may be able to increase total CPU power used by
         * moving them.
         */

        pwr_now += sds->busiest->sgp->power *
                        min(sds->busiest_load_per_task, sds->max_load);
        pwr_now += sds->this->sgp->power *
                        min(sds->this_load_per_task, sds->this_load);
        pwr_now /= SCHED_POWER_SCALE;

        /* Amount of load we'd subtract */
        tmp = (sds->busiest_load_per_task * SCHED_POWER_SCALE) /
                sds->busiest->sgp->power;
        if (sds->max_load > tmp)
                pwr_move += sds->busiest->sgp->power *
                        min(sds->busiest_load_per_task, sds->max_load - tmp);

        /* Amount of load we'd add */
        if (sds->max_load * sds->busiest->sgp->power <
                sds->busiest_load_per_task * SCHED_POWER_SCALE)
                tmp = (sds->max_load * sds->busiest->sgp->power) /
                        sds->this->sgp->power;
        else
                tmp = (sds->busiest_load_per_task * SCHED_POWER_SCALE) /
                        sds->this->sgp->power;
        pwr_move += sds->this->sgp->power *
                        min(sds->this_load_per_task, sds->this_load + tmp);
        pwr_move /= SCHED_POWER_SCALE;

        /* Move if we gain throughput */
        if (pwr_move > pwr_now)
                env->imbalance = sds->busiest_load_per_task;
}

/**
 * calculate_imbalance - Calculate the amount of imbalance present within the
 *                       groups of a given sched_domain during load balance.
 * @env: load balance environment
 * @sds: statistics of the sched_domain whose imbalance is to be calculated.
 */
static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
{
        unsigned long max_pull, load_above_capacity = ~0UL;

        sds->busiest_load_per_task /= sds->busiest_nr_running;
        if (sds->group_imb) {
                sds->busiest_load_per_task =
                        min(sds->busiest_load_per_task, sds->avg_load);
        }

        /*
         * In the presence of smp nice balancing, certain scenarios can have
         * max load less than avg load(as we skip the groups at or below
         * its cpu_power, while calculating max_load..)
         */
        if (sds->max_load < sds->avg_load) {
                env->imbalance = 0;
                return fix_small_imbalance(env, sds);
        }

        if (!sds->group_imb) {
                /*
                 * Don't want to pull so many tasks that a group would go idle.
                 */
                load_above_capacity = (sds->busiest_nr_running -
                                                sds->busiest_group_capacity);

                load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_POWER_SCALE);

                load_above_capacity /= sds->busiest->sgp->power;
        }

        /*
         * We're trying to get all the cpus to the average_load, so we don't
         * want to push ourselves above the average load, nor do we wish to
         * reduce the max loaded cpu below the average load. At the same time,
         * we also don't want to reduce the group load below the group capacity
         * (so that we can implement power-savings policies etc). Thus we look
         * for the minimum possible imbalance.
         * Be careful of negative numbers as they'll appear as very large values
         * with unsigned longs.
         */
        max_pull = min(sds->max_load - sds->avg_load, load_above_capacity);

        /* How much load to actually move to equalise the imbalance */
        env->imbalance = min(max_pull * sds->busiest->sgp->power,
                (sds->avg_load - sds->this_load) * sds->this->sgp->power)
                        / SCHED_POWER_SCALE;

        /*
         * if *imbalance is less than the average load per runnable task
         * there is no guarantee that any tasks will be moved so we'll have
         * a think about bumping its value to force at least one task to be
         * moved
         */
        if (env->imbalance < sds->busiest_load_per_task)
                return fix_small_imbalance(env, sds);

}

/******* find_busiest_group() helpers end here *********************/

/**
 * find_busiest_group - Returns the busiest group within the sched_domain
 * if there is an imbalance. If there isn't an imbalance, and
 * the user has opted for power-savings, it returns a group whose
 * CPUs can be put to idle by rebalancing those tasks elsewhere, if
 * such a group exists.
 *
 * Also calculates the amount of weighted load which should be moved
 * to restore balance.
 *
 * @env: The load balancing environment.
 * @balance: Pointer to a variable indicating if this_cpu
 *      is the appropriate cpu to perform load balancing at this_level.
 *
 * Returns:     - the busiest group if imbalance exists.
 *              - If no imbalance and user has opted for power-savings balance,
 *                 return the least loaded group whose CPUs can be
 *                 put to idle by rebalancing its tasks onto our group.
 */
static struct sched_group *
find_busiest_group(struct lb_env *env, int *balance)
{
        struct sd_lb_stats sds;

        memset(&sds, 0, sizeof(sds));

        /*
         * Compute the various statistics relavent for load balancing at
         * this level.
         */
        update_sd_lb_stats(env, balance, &sds);

        /*
         * this_cpu is not the appropriate cpu to perform load balancing at
         * this level.
         */
        if (!(*balance)){
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_BALANCE);
                goto ret;
        }

        if ((env->idle == CPU_IDLE || env->idle == CPU_NEWLY_IDLE) &&
            check_asym_packing(env, &sds))
                return sds.busiest;

        /* There is no busy sibling group to pull tasks from */
        if (!sds.busiest || sds.busiest_nr_running == 0){
                if(!sds.busiest){
                        mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_NOBUSYG_BUSIEST_NO_TASK);
                }else{
                        mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_NOBUSYG_NO_BUSIEST);
                }               
                goto out_balanced;
        }

        sds.avg_load = (SCHED_POWER_SCALE * sds.total_load) / sds.total_pwr;

        /*
         * If the busiest group is imbalanced the below checks don't
         * work because they assumes all things are equal, which typically
         * isn't true due to cpus_allowed constraints and the like.
         */
        if (sds.group_imb)
                goto force_balance;

        /* SD_BALANCE_NEWIDLE trumps SMP nice when underutilized */
        if (env->idle == CPU_NEWLY_IDLE && sds.this_has_capacity &&
                        !sds.busiest_has_capacity)
                goto force_balance;

        /*
         * If the local group is more busy than the selected busiest group
         * don't try and pull any tasks.
         */
        if (sds.this_load >= sds.max_load){
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_NOBUSYG_NO_LARGER_THAN);          
                goto out_balanced;
        }

        /*
         * Don't pull any tasks if this group is already above the domain
         * average load.
         */
        if (sds.this_load >= sds.avg_load){
                mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_NOBUSYG_NO_LARGER_THAN);
                goto out_balanced;
        }

        if (env->idle == CPU_IDLE) {
                /*
                 * This cpu is idle. If the busiest group load doesn't
                 * have more tasks than the number of available cpu's and
                 * there is no imbalance between this and busiest group
                 * wrt to idle cpu's, it is balanced.
                 */
                if ((sds.this_idle_cpus <= sds.busiest_idle_cpus + 1) &&
                    sds.busiest_nr_running <= sds.busiest_group_weight)
                        goto out_balanced;
        } else {
                /*
                 * In the CPU_NEWLY_IDLE, CPU_NOT_IDLE cases, use
                 * imbalance_pct to be conservative.
                 */
                if (100 * sds.max_load <= env->sd->imbalance_pct * sds.this_load){
                        mt_lbprof_stat_or(env->fail_reason, MT_LBPROF_NOBUSYG_CHECK_FAIL);
                        goto out_balanced;
                }
        }

force_balance:
        /* Looks like there is an imbalance. Compute it */
        calculate_imbalance(env, &sds);
        return sds.busiest;

out_balanced:
ret:
        env->imbalance = 0;
        return NULL;
}

/*
 * find_busiest_queue - find the busiest runqueue among the cpus in group.
 */
static struct rq *find_busiest_queue(struct lb_env *env,
                                     struct sched_group *group)
{
        struct rq *busiest = NULL, *rq;
        unsigned long max_load = 0;
        int i;

        for_each_cpu(i, sched_group_cpus(group)) {
                unsigned long power = power_of(i);
                unsigned long capacity = DIV_ROUND_CLOSEST(power,
                                                           SCHED_POWER_SCALE);
                unsigned long wl;

                if (!capacity)
                        capacity = fix_small_capacity(env->sd, group);

                if (!cpumask_test_cpu(i, env->cpus))
                        continue;

                rq = cpu_rq(i);
                wl = weighted_cpuload(i);

                /*
                 * When comparing with imbalance, use weighted_cpuload()
                 * which is not scaled with the cpu power.
                 */
                if (capacity && rq->nr_running == 1 && wl > env->imbalance)
                        continue;

                /*
                 * For the load comparisons with the other cpu's, consider
                 * the weighted_cpuload() scaled with the cpu power, so that
                 * the load can be moved away from the cpu that is potentially
                 * running at a lower capacity.
                 */
                wl = (wl * SCHED_POWER_SCALE) / power;

                if (wl > max_load) {
                        max_load = wl;
                        busiest = rq;
                }
        }

        return busiest;
}

/*
 * Max backoff if we encounter pinned tasks. Pretty arbitrary value, but
 * so long as it is large enough.
 */
#define MAX_PINNED_INTERVAL     512

/* Working cpumask for load_balance and load_balance_newidle. */
DEFINE_PER_CPU(cpumask_var_t, load_balance_mask);

static int need_active_balance(struct lb_env *env)
{
        struct sched_domain *sd = env->sd;

        if (env->idle == CPU_NEWLY_IDLE) {

                /*
                 * ASYM_PACKING needs to force migrate tasks from busy but
                 * higher numbered CPUs in order to pack all tasks in the
                 * lowest numbered CPUs.
                 */
                if ((sd->flags & SD_ASYM_PACKING) && env->src_cpu > env->dst_cpu)
                        return 1;
        }

        return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2);
}

static int active_load_balance_cpu_stop(void *data);

/*
 * Check this_cpu to ensure it is balanced within domain. Attempt to move
 * tasks if there is an imbalance.
 */
static int load_balance(int this_cpu, struct rq *this_rq,
                        struct sched_domain *sd, enum cpu_idle_type idle,
                        int *balance)
{
        int ld_moved, cur_ld_moved, active_balance = 0;
        struct sched_group *group;
        struct rq *busiest;
        unsigned long flags;
        struct cpumask *cpus = __get_cpu_var(load_balance_mask);

        struct lb_env env = {
                .sd             = sd,
                .dst_cpu        = this_cpu,
                .dst_rq         = this_rq,
                .dst_grpmask    = sched_group_cpus(sd->groups),
                .idle           = idle,
                .loop_break     = sched_nr_migrate_break,
                .cpus           = cpus,
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
                .fail_reason= MT_LBPROF_NO_TRIGGER,
#endif
        };

        /*
         * For NEWLY_IDLE load_balancing, we don't need to consider
         * other cpus in our group
         */
        if (idle == CPU_NEWLY_IDLE)
                env.dst_grpmask = NULL;

        cpumask_copy(cpus, cpu_active_mask);

        schedstat_inc(sd, lb_count[idle]);

redo:
        group = find_busiest_group(&env, balance);

        if (*balance == 0)
                goto out_balanced;

        if (!group) {
                schedstat_inc(sd, lb_nobusyg[idle]);
                if(mt_lbprof_test(env.fail_reason, MT_LBPROF_HISTORY)){
                        int tmp_cpu;
                        for_each_cpu(tmp_cpu, cpu_possible_mask){
                                if (tmp_cpu == this_rq->cpu)
                                        continue;
                                mt_lbprof_update_state(tmp_cpu, MT_LBPROF_BALANCE_FAIL_STATE);
                        }
                }               
                goto out_balanced;
        }

        busiest = find_busiest_queue(&env, group);
        if (!busiest) {
                schedstat_inc(sd, lb_nobusyq[idle]);
                mt_lbprof_stat_or(env.fail_reason, MT_LBPROF_NOBUSYQ);
                goto out_balanced;
        }

#ifdef CONFIG_HMP_LAZY_BALANCE

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
        if (PA_ENABLE && LB_ENABLE) {
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
 
                if (per_cpu(sd_pack_buddy, this_cpu) == busiest->cpu && !is_buddy_busy(per_cpu(sd_pack_buddy, this_cpu))) {

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
                        AVOID_LOAD_BALANCE_FROM_CPUX_TO_CPUY_COUNT[this_cpu][busiest->cpu]++;

#ifdef CONFIG_HMP_TRACER
                        trace_sched_power_aware_active(POWER_AWARE_ACTIVE_MODULE_AVOID_BALANCE_FORM_CPUX_TO_CPUY, 0, this_cpu, busiest->cpu);
#endif /* CONFIG_HMP_TRACER */

#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */

                        schedstat_inc(sd, lb_nobusyq[idle]);
                        goto out_balanced;              
                }

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER    
        }
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */

#endif /* CONFIG_HMP_LAZY_BALANCE */

        BUG_ON(busiest == env.dst_rq);

        schedstat_add(sd, lb_imbalance[idle], env.imbalance);

        ld_moved = 0;
        if (busiest->nr_running > 1) {
                /*
                 * Attempt to move tasks. If find_busiest_group has found
                 * an imbalance but busiest->nr_running <= 1, the group is
                 * still unbalanced. ld_moved simply stays zero, so it is
                 * correctly treated as an imbalance.
                 */
                env.flags |= LBF_ALL_PINNED;
                env.src_cpu   = busiest->cpu;
                env.src_rq    = busiest;
                env.loop_max  = min(sysctl_sched_nr_migrate, busiest->nr_running);
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
                env.mt_check_cache_in_idle = 1;
#endif

                update_h_load(env.src_cpu);
more_balance:
                local_irq_save(flags);
                double_rq_lock(env.dst_rq, busiest);
#ifdef CONFIG_MTK_SCHED_CMP
                env.loop_max    = min_t(unsigned long, sysctl_sched_nr_migrate, busiest->nr_running);
                mt_sched_printf("1 env.loop_max=%d, busiest->nr_running=%d src=%d, dst=%d, cpus_share_cache=%d",
                        env.loop_max, busiest->nr_running, env.src_cpu, env.dst_cpu, cpus_share_cache(env.src_cpu, env.dst_cpu));
#endif /* CONFIG_MTK_SCHED_CMP */
                /*
                 * cur_ld_moved - load moved in current iteration
                 * ld_moved     - cumulative load moved across iterations
                 */
#ifdef CONFIG_MTK_SCHED_CMP
                if (!cpus_share_cache(env.src_cpu, env.dst_cpu))
                        cur_ld_moved = cmp_move_tasks(sd, &env);
                else
                        cur_ld_moved = move_tasks(&env);
#else /* !CONFIG_MTK_SCHED_CMP */
                cur_ld_moved = move_tasks(&env);
#endif /* CONFIG_MTK_SCHED_CMP */
                ld_moved += cur_ld_moved;
                double_rq_unlock(env.dst_rq, busiest);
                local_irq_restore(flags);

                /*
                 * some other cpu did the load balance for us.
                 */
                if (cur_ld_moved && env.dst_cpu != smp_processor_id())
                        resched_cpu(env.dst_cpu);

                if (env.flags & LBF_NEED_BREAK) {
                        env.flags &= ~LBF_NEED_BREAK;
                        goto more_balance;
                }

                /*
                 * Revisit (affine) tasks on src_cpu that couldn't be moved to
                 * us and move them to an alternate dst_cpu in our sched_group
                 * where they can run. The upper limit on how many times we
                 * iterate on same src_cpu is dependent on number of cpus in our
                 * sched_group.
                 *
                 * This changes load balance semantics a bit on who can move
                 * load to a given_cpu. In addition to the given_cpu itself
                 * (or a ilb_cpu acting on its behalf where given_cpu is
                 * nohz-idle), we now have balance_cpu in a position to move
                 * load to given_cpu. In rare situations, this may cause
                 * conflicts (balance_cpu and given_cpu/ilb_cpu deciding
                 * _independently_ and at _same_ time to move some load to
                 * given_cpu) causing exceess load to be moved to given_cpu.
                 * This however should not happen so much in practice and
                 * moreover subsequent load balance cycles should correct the
                 * excess load moved.
                 */
                if ((env.flags & LBF_SOME_PINNED) && env.imbalance > 0) {

                        env.dst_rq       = cpu_rq(env.new_dst_cpu);
                        env.dst_cpu      = env.new_dst_cpu;
                        env.flags       &= ~LBF_SOME_PINNED;
                        env.loop         = 0;
                        env.loop_break   = sched_nr_migrate_break;

                        /* Prevent to re-select dst_cpu via env's cpus */
                        cpumask_clear_cpu(env.dst_cpu, env.cpus);

                        /*
                         * Go back to "more_balance" rather than "redo" since we
                         * need to continue with same src_cpu.
                         */
                        goto more_balance;
                }

                /* All tasks on this runqueue were pinned by CPU affinity */
                if (unlikely(env.flags & LBF_ALL_PINNED)) {
                        mt_lbprof_update_state(busiest->cpu, MT_LBPROF_ALLPINNED);
                        cpumask_clear_cpu(cpu_of(busiest), cpus);
                        if (!cpumask_empty(cpus)) {
                                env.loop = 0;
                                env.loop_break = sched_nr_migrate_break;
                                goto redo;
                        }
                        goto out_balanced;
                }
                
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
                /* when move tasks fil, force migration no matter cache-hot */
                /*  use mt_check_cache_in_idle */
                if (!ld_moved && ((CPU_NEWLY_IDLE == idle) || (CPU_IDLE == idle) ) ) {
#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
                        mt_lbprof_stat_set(env.fail_reason, MT_LBPROF_DO_LB);
#endif
                        env.mt_check_cache_in_idle = 0; 
                        env.loop = 0;
                        local_irq_save(flags);
                        double_rq_lock(env.dst_rq, busiest);
#ifdef CONFIG_MTK_SCHED_CMP
                        env.loop_max    = min_t(unsigned long, sysctl_sched_nr_migrate, busiest->nr_running);
                        mt_sched_printf("2 env.loop_max=%d, busiest->nr_running=%d",
                        env.loop_max, busiest->nr_running);
#endif /* CONFIG_MTK_SCHED_CMP */
                        if (!env.loop)
                                update_h_load(env.src_cpu);                             
#ifdef CONFIG_MTK_SCHED_CMP_TGS
                        if (!cpus_share_cache(env.src_cpu, env.dst_cpu)) 
                                ld_moved = cmp_move_tasks(sd, &env);
                        else{
                                ld_moved = move_tasks(&env);
                        }
#else /* !CONFIG_MTK_SCHED_CMP_TGS */
                        ld_moved = move_tasks(&env);
#endif /* CONFIG_MTK_SCHED_CMP_TGS */
                        double_rq_unlock(env.dst_rq, busiest);
                        local_irq_restore(flags);

                        /*
                         * some other cpu did the load balance for us.
                        */
                        if (ld_moved && this_cpu != smp_processor_id())
                                resched_cpu(this_cpu);                  
                }
#endif          
        }

        if (!ld_moved) {
                schedstat_inc(sd, lb_failed[idle]);
                mt_lbprof_stat_or(env.fail_reason, MT_LBPROF_FAILED);
                if ( mt_lbprof_test(env.fail_reason, MT_LBPROF_AFFINITY) ) {
                        mt_lbprof_update_state(busiest->cpu, MT_LBPROF_FAILURE_STATE);
                }else if ( mt_lbprof_test(env.fail_reason, MT_LBPROF_CACHEHOT) ) {
                        mt_lbprof_update_state(busiest->cpu, MT_LBPROF_FAILURE_STATE);
                }

                /*
                 * Increment the failure counter only on periodic balance.
                 * We do not want newidle balance, which can be very
                 * frequent, pollute the failure counter causing
                 * excessive cache_hot migrations and active balances.
                 */
                if (idle != CPU_NEWLY_IDLE)
                        sd->nr_balance_failed++;
                mt_lbprof_stat_inc(sd, mt_lbprof_nr_balance_failed);

                if (need_active_balance(&env)) {
                        raw_spin_lock_irqsave(&busiest->lock, flags);

                        /* don't kick the active_load_balance_cpu_stop,
                         * if the curr task on busiest cpu can't be
                         * moved to this_cpu
                         */
                        if (!cpumask_test_cpu(this_cpu,
                                        tsk_cpus_allowed(busiest->curr))) {
                                raw_spin_unlock_irqrestore(&busiest->lock,
                                                            flags);
                                env.flags |= LBF_ALL_PINNED;
                                goto out_one_pinned;
                        }

                        /*
                         * ->active_balance synchronizes accesses to
                         * ->active_balance_work.  Once set, it's cleared
                         * only after active load balance is finished.
                         */
                        if (!busiest->active_balance) {
                                busiest->active_balance = 1;
                                busiest->push_cpu = this_cpu;
                                active_balance = 1;
                        }
                        raw_spin_unlock_irqrestore(&busiest->lock, flags);

                        if (active_balance) {
                                stop_one_cpu_nowait(cpu_of(busiest),
                                        active_load_balance_cpu_stop, busiest,
                                        &busiest->active_balance_work);
                        }

                        /*
                         * We've kicked active balancing, reset the failure
                         * counter.
                         */
                        sd->nr_balance_failed = sd->cache_nice_tries+1;
                }
        } else
                sd->nr_balance_failed = 0;

        if (likely(!active_balance)) {
                /* We were unbalanced, so reset the balancing interval */
                sd->balance_interval = sd->min_interval;
        } else {
                /*
                 * If we've begun active balancing, start to back off. This
                 * case may not be covered by the all_pinned logic if there
                 * is only 1 task on the busy runqueue (because we don't call
                 * move_tasks).
                 */
                if (sd->balance_interval < sd->max_interval)
                        sd->balance_interval *= 2;
        }

        goto out;

out_balanced:
        schedstat_inc(sd, lb_balanced[idle]);

        sd->nr_balance_failed = 0;
        mt_lbprof_stat_set(sd->mt_lbprof_nr_balance_failed, 0);

out_one_pinned:
        /* tune up the balancing interval */
        if (((env.flags & LBF_ALL_PINNED) &&
                        sd->balance_interval < MAX_PINNED_INTERVAL) ||
                        (sd->balance_interval < sd->max_interval))
                sd->balance_interval *= 2;

        ld_moved = 0;
out:
        if (ld_moved){
                mt_lbprof_stat_or(env.fail_reason, MT_LBPROF_SUCCESS);
                mt_lbprof_stat_set(sd->mt_lbprof_nr_balance_failed, 0);
        }       

#ifdef CONFIG_MT_LOAD_BALANCE_PROFILER
        if( CPU_NEWLY_IDLE == idle){
                char strings[128]="";
                snprintf(strings, 128, "%d:idle balance:%d:0x%x ", this_cpu, ld_moved, env.fail_reason);
                mt_lbprof_rqinfo(strings);
                trace_sched_lbprof_log(strings);
        }else{
                char strings[128]="";
                snprintf(strings, 128, "%d:periodic balance:%d:0x%x ", this_cpu, ld_moved, env.fail_reason);
                mt_lbprof_rqinfo(strings);
                trace_sched_lbprof_log(strings);
        }
#endif

        return ld_moved;
}

/*
 * idle_balance is called by schedule() if this_cpu is about to become
 * idle. Attempts to pull tasks from other CPUs.
 */
void idle_balance(int this_cpu, struct rq *this_rq)
{
        struct sched_domain *sd;
        int pulled_task = 0;
        unsigned long next_balance = jiffies + HZ;
#if defined(CONFIG_MT_LOAD_BALANCE_ENHANCEMENT) || defined(CONFIG_MT_LOAD_BALANCE_PROFILER)
        unsigned long counter = 0;
#endif

        this_rq->idle_stamp = this_rq->clock;

        mt_lbprof_update_state_has_lock(this_cpu, MT_LBPROF_UPDATE_STATE);
#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        #ifdef CONFIG_LOCAL_TIMERS
                counter = localtimer_get_counter();
                if ( counter >= 260000 )  // 20ms
                        goto must_do;
                if ( time_before(jiffies + 2, this_rq->next_balance) )  // 20ms
                        goto must_do;
        #endif
#endif

        if (this_rq->avg_idle < sysctl_sched_migration_cost){
#if defined(CONFIG_MT_LOAD_BALANCE_PROFILER)
                char strings[128]="";
                mt_lbprof_update_state_has_lock(this_cpu, MT_LBPROF_ALLOW_UNBLANCE_STATE);
                snprintf(strings, 128, "%d:idle balance bypass: %llu %lu ", this_cpu, this_rq->avg_idle, counter);
                mt_lbprof_rqinfo(strings);
                trace_sched_lbprof_log(strings);
#endif          
                return;
        }

#ifdef CONFIG_MT_LOAD_BALANCE_ENHANCEMENT
        must_do:
#endif

        /*
         * Drop the rq->lock, but keep IRQ/preempt disabled.
         */
        raw_spin_unlock(&this_rq->lock);

        mt_lbprof_update_status();
        update_blocked_averages(this_cpu);
        rcu_read_lock();
        for_each_domain(this_cpu, sd) {
                unsigned long interval;
                int balance = 1;

                if (!(sd->flags & SD_LOAD_BALANCE))
                        continue;

                if (sd->flags & SD_BALANCE_NEWIDLE) {
                        /* If we've pulled tasks over stop searching: */
                        pulled_task = load_balance(this_cpu, this_rq,
                                                   sd, CPU_NEWLY_IDLE, &balance);
                }

                interval = msecs_to_jiffies(sd->balance_interval);
                if (time_after(next_balance, sd->last_balance + interval))
                        next_balance = sd->last_balance + interval;
                if (pulled_task) {
                        this_rq->idle_stamp = 0;
                        break;
                }
        }
        rcu_read_unlock();

        raw_spin_lock(&this_rq->lock);

        if (pulled_task || time_after(jiffies, this_rq->next_balance)) {
                /*
                 * We are going idle. next_balance may be set based on
                 * a busy processor. So reset next_balance.
                 */
                this_rq->next_balance = next_balance;
        }
}

/*
 * active_load_balance_cpu_stop is run by cpu stopper. It pushes
 * running tasks off the busiest CPU onto idle CPUs. It requires at
 * least 1 task to be running on each physical CPU where possible, and
 * avoids physical / logical imbalances.
 */
static int active_load_balance_cpu_stop(void *data)
{
        struct rq *busiest_rq = data;
        int busiest_cpu = cpu_of(busiest_rq);
        int target_cpu = busiest_rq->push_cpu;
        struct rq *target_rq = cpu_rq(target_cpu);
        struct sched_domain *sd;

        raw_spin_lock_irq(&busiest_rq->lock);

        /* make sure the requested cpu hasn't gone down in the meantime */
        if (unlikely(busiest_cpu != smp_processor_id() ||
                     !busiest_rq->active_balance))
                goto out_unlock;

        /* Is there any task to move? */
        if (busiest_rq->nr_running <= 1)
                goto out_unlock;

        /*
         * This condition is "impossible", if it occurs
         * we need to fix it. Originally reported by
         * Bjorn Helgaas on a 128-cpu setup.
         */
        BUG_ON(busiest_rq == target_rq);

        /* move a task from busiest_rq to target_rq */
        double_lock_balance(busiest_rq, target_rq);

        /* Search for an sd spanning us and the target CPU. */
        rcu_read_lock();
        for_each_domain(target_cpu, sd) {
                if ((sd->flags & SD_LOAD_BALANCE) &&
                    cpumask_test_cpu(busiest_cpu, sched_domain_span(sd)))
                                break;
        }

        if (likely(sd)) {
                struct lb_env env = {
                        .sd             = sd,
                        .dst_cpu        = target_cpu,
                        .dst_rq         = target_rq,
                        .src_cpu        = busiest_rq->cpu,
                        .src_rq         = busiest_rq,
                        .idle           = CPU_IDLE,
                };

                schedstat_inc(sd, alb_count);

                if (move_one_task(&env))
                        schedstat_inc(sd, alb_pushed);
                else
                        schedstat_inc(sd, alb_failed);
        }
        rcu_read_unlock();
        double_unlock_balance(busiest_rq, target_rq);
out_unlock:
        busiest_rq->active_balance = 0;
        raw_spin_unlock_irq(&busiest_rq->lock);
        return 0;
}

#ifdef CONFIG_NO_HZ_COMMON
/*
 * idle load balancing details
 * - When one of the busy CPUs notice that there may be an idle rebalancing
 *   needed, they will kick the idle load balancer, which then does idle
 *   load balancing for all the idle CPUs.
 */
static struct {
        cpumask_var_t idle_cpus_mask;
        atomic_t nr_cpus;
        unsigned long next_balance;     /* in jiffy units */
} nohz ____cacheline_aligned;


static inline int find_new_ilb(int call_cpu)
{
#ifdef CONFIG_HMP_PACK_SMALL_TASK 

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER

        struct sched_domain *sd;
        
        int ilb_new = nr_cpu_ids;
        
        int ilb_return = 0;
        
        int ilb = cpumask_first(nohz.idle_cpus_mask);

        
        if(PA_ENABLE)
        {
                int buddy = per_cpu(sd_pack_buddy, call_cpu);

                /*
                * If we have a pack buddy CPU, we try to run load balance on a CPU
                * that is close to the buddy.
                */
                if (buddy != -1)
                        for_each_domain(buddy, sd) {
                                if (sd->flags & SD_SHARE_CPUPOWER)
                                        continue;

                                ilb_new = cpumask_first_and(sched_domain_span(sd),
                                                nohz.idle_cpus_mask);

                                if (ilb_new < nr_cpu_ids)
                                        break;
                                                                        
                        }
        }

        if (ilb < nr_cpu_ids && idle_cpu(ilb)) {
                ilb_return = 1;
        }

        if (ilb_new < nr_cpu_ids) {
                if (idle_cpu(ilb_new)) {
                        if(PA_ENABLE && ilb_return && ilb_new != ilb) { 
                                AVOID_WAKE_UP_FROM_CPUX_TO_CPUY_COUNT[call_cpu][ilb]++;

#ifdef CONFIG_HMP_TRACER
                                trace_sched_power_aware_active(POWER_AWARE_ACTIVE_MODULE_AVOID_WAKE_UP_FORM_CPUX_TO_CPUY, 0, call_cpu, ilb);
#endif /* CONFIG_HMP_TRACER */

                        }
                        return ilb_new;                 
                }
        }
        
        if(ilb_return) {
                return ilb;
        }
                        
        return nr_cpu_ids;
  
#else  /* CONFIG_HMP_POWER_AWARE_CONTROLLER */  

        struct sched_domain *sd;
        int ilb = cpumask_first(nohz.idle_cpus_mask);
        int buddy = per_cpu(sd_pack_buddy, call_cpu);

        /*
         * If we have a pack buddy CPU, we try to run load balance on a CPU
         * that is close to the buddy.
         */
        if (buddy != -1)
                for_each_domain(buddy, sd) {
                        if (sd->flags & SD_SHARE_CPUPOWER)
                                continue;

                        ilb = cpumask_first_and(sched_domain_span(sd),
                                        nohz.idle_cpus_mask);

                        if (ilb < nr_cpu_ids)
                                break;
                }

        if (ilb < nr_cpu_ids && idle_cpu(ilb))
                return ilb;

        return nr_cpu_ids;

#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */  

#else /* CONFIG_HMP_PACK_SMALL_TASK */ 

        int ilb = cpumask_first(nohz.idle_cpus_mask);
#ifdef CONFIG_MTK_SCHED_CMP_TGS
        /* Find nohz balancing to occur in the same cluster firstly */
        int new_ilb;
        struct cpumask tmp;
        //Find idle cpu with online one
        get_cluster_cpus(&tmp, get_cluster_id(call_cpu), true);
        new_ilb = cpumask_first_and(nohz.idle_cpus_mask, &tmp);
        if (new_ilb < nr_cpu_ids && idle_cpu(new_ilb))
        {
#ifdef CONFIG_MTK_SCHED_CMP_POWER_AWARE_CONTROLLER
                if(new_ilb != ilb)
                {
                        mt_sched_printf("[PA]find_new_ilb(cpu%x), new_ilb = %d, ilb = %d\n", call_cpu, new_ilb, ilb);
                        AVOID_WAKE_UP_FROM_CPUX_TO_CPUY_COUNT[call_cpu][ilb]++;
                }
#endif
                return new_ilb;
        }
#endif /* CONFIG_MTK_SCHED_CMP_TGS */

        if (ilb < nr_cpu_ids && idle_cpu(ilb))
                return ilb;

        return nr_cpu_ids;

#endif /* CONFIG_HMP_PACK_SMALL_TASK */

}


/*
 * Kick a CPU to do the nohz balancing, if it is time for it. We pick the
 * nohz_load_balancer CPU (if there is one) otherwise fallback to any idle
 * CPU (if there is one).
 */
static void nohz_balancer_kick(int cpu)
{
        int ilb_cpu;

        nohz.next_balance++;

        ilb_cpu = find_new_ilb(cpu);

        if (ilb_cpu >= nr_cpu_ids)
                return;

        if (test_and_set_bit(NOHZ_BALANCE_KICK, nohz_flags(ilb_cpu)))
                return;
        /*
         * Use smp_send_reschedule() instead of resched_cpu().
         * This way we generate a sched IPI on the target cpu which
         * is idle. And the softirq performing nohz idle load balance
         * will be run before returning from the IPI.
         */
        smp_send_reschedule(ilb_cpu);
        return;
}

static inline void nohz_balance_exit_idle(int cpu)
{
        if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) {
                cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
                atomic_dec(&nohz.nr_cpus);
                clear_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
        }
}

static inline void set_cpu_sd_state_busy(void)
{
        struct sched_domain *sd;
        int cpu = smp_processor_id();

        rcu_read_lock();
        sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd);

        if (!sd || !sd->nohz_idle)
                goto unlock;
        sd->nohz_idle = 0;

        for (; sd; sd = sd->parent)
                atomic_inc(&sd->groups->sgp->nr_busy_cpus);
unlock:
        rcu_read_unlock();
}

void set_cpu_sd_state_idle(void)
{
        struct sched_domain *sd;
        int cpu = smp_processor_id();

        rcu_read_lock();
        sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd);

        if (!sd || sd->nohz_idle)
                goto unlock;
        sd->nohz_idle = 1;

        for (; sd; sd = sd->parent)
                atomic_dec(&sd->groups->sgp->nr_busy_cpus);
unlock:
        rcu_read_unlock();
}

/*
 * This routine will record that the cpu is going idle with tick stopped.
 * This info will be used in performing idle load balancing in the future.
 */
void nohz_balance_enter_idle(int cpu)
{
        /*
         * If this cpu is going down, then nothing needs to be done.
         */
        if (!cpu_active(cpu))
                return;

        if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))
                return;

        cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
        atomic_inc(&nohz.nr_cpus);
        set_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
}

static int __cpuinit sched_ilb_notifier(struct notifier_block *nfb,
                                        unsigned long action, void *hcpu)
{
        switch (action & ~CPU_TASKS_FROZEN) {
        case CPU_DYING:
                nohz_balance_exit_idle(smp_processor_id());
                return NOTIFY_OK;
        default:
                return NOTIFY_DONE;
        }
}
#endif

static DEFINE_SPINLOCK(balancing);

/*
 * Scale the max load_balance interval with the number of CPUs in the system.
 * This trades load-balance latency on larger machines for less cross talk.
 */
void update_max_interval(void)
{
        max_load_balance_interval = HZ*num_online_cpus()/10;
}

/*
 * It checks each scheduling domain to see if it is due to be balanced,
 * and initiates a balancing operation if so.
 *
 * Balancing parameters are set up in init_sched_domains.
 */
static void rebalance_domains(int cpu, enum cpu_idle_type idle)
{
        int balance = 1;
        struct rq *rq = cpu_rq(cpu);
        unsigned long interval;
        struct sched_domain *sd;
        /* Earliest time when we have to do rebalance again */
        unsigned long next_balance = jiffies + 60*HZ;
        int update_next_balance = 0;
        int need_serialize;

        update_blocked_averages(cpu);

        rcu_read_lock();
        for_each_domain(cpu, sd) {
                if (!(sd->flags & SD_LOAD_BALANCE))
                        continue;

                interval = sd->balance_interval;
                if (idle != CPU_IDLE)
                        interval *= sd->busy_factor;

                /* scale ms to jiffies */
                interval = msecs_to_jiffies(interval);
                interval = clamp(interval, 1UL, max_load_balance_interval);

                need_serialize = sd->flags & SD_SERIALIZE;

                if (need_serialize) {
                        if (!spin_trylock(&balancing))
                                goto out;
                }

                if (time_after_eq(jiffies, sd->last_balance + interval)) {
                        if (load_balance(cpu, rq, sd, idle, &balance)) {
                                /*
                                 * The LBF_SOME_PINNED logic could have changed
                                 * env->dst_cpu, so we can't know our idle
                                 * state even if we migrated tasks. Update it.
                                 */
                                idle = idle_cpu(cpu) ? CPU_IDLE : CPU_NOT_IDLE;
                        }
                        sd->last_balance = jiffies;
                }
                if (need_serialize)
                        spin_unlock(&balancing);
out:
                if (time_after(next_balance, sd->last_balance + interval)) {
                        next_balance = sd->last_balance + interval;
                        update_next_balance = 1;
                }

                /*
                 * Stop the load balance at this level. There is another
                 * CPU in our sched group which is doing load balancing more
                 * actively.
                 */
                if (!balance)
                        break;
        }
        rcu_read_unlock();

        /*
         * next_balance will be updated only when there is a need.
         * When the cpu is attached to null domain for ex, it will not be
         * updated.
         */
        if (likely(update_next_balance))
                rq->next_balance = next_balance;
}

#ifdef CONFIG_NO_HZ_COMMON
/*
 * In CONFIG_NO_HZ_COMMON case, the idle balance kickee will do the
 * rebalancing for all the cpus for whom scheduler ticks are stopped.
 */
static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
{
        struct rq *this_rq = cpu_rq(this_cpu);
        struct rq *rq;
        int balance_cpu;

        if (idle != CPU_IDLE ||
            !test_bit(NOHZ_BALANCE_KICK, nohz_flags(this_cpu)))
                goto end;

        for_each_cpu(balance_cpu, nohz.idle_cpus_mask) {
                if (balance_cpu == this_cpu || !idle_cpu(balance_cpu))
                        continue;

                /*
                 * If this cpu gets work to do, stop the load balancing
                 * work being done for other cpus. Next load
                 * balancing owner will pick it up.
                 */
                if (need_resched())
                        break;

                rq = cpu_rq(balance_cpu);

                raw_spin_lock_irq(&rq->lock);
                update_rq_clock(rq);
                update_idle_cpu_load(rq);
                raw_spin_unlock_irq(&rq->lock);

                rebalance_domains(balance_cpu, CPU_IDLE);

                if (time_after(this_rq->next_balance, rq->next_balance))
                        this_rq->next_balance = rq->next_balance;
        }
        nohz.next_balance = this_rq->next_balance;
end:
        clear_bit(NOHZ_BALANCE_KICK, nohz_flags(this_cpu));
}

/*
 * Current heuristic for kicking the idle load balancer in the presence
 * of an idle cpu is the system.
 *   - This rq has more than one task.
 *   - At any scheduler domain level, this cpu's scheduler group has multiple
 *     busy cpu's exceeding the group's power.
 *   - For SD_ASYM_PACKING, if the lower numbered cpu's in the scheduler
 *     domain span are idle.
 */
static inline int nohz_kick_needed(struct rq *rq, int cpu)
{
        unsigned long now = jiffies;
        struct sched_domain *sd;

        if (unlikely(idle_cpu(cpu)))
                return 0;

       /*
        * We may be recently in ticked or tickless idle mode. At the first
        * busy tick after returning from idle, we will update the busy stats.
        */
        set_cpu_sd_state_busy();
        nohz_balance_exit_idle(cpu);

        /*
         * None are in tickless mode and hence no need for NOHZ idle load
         * balancing.
         */
        if (likely(!atomic_read(&nohz.nr_cpus)))
                return 0;

        if (time_before(now, nohz.next_balance))
                return 0;

#ifdef CONFIG_SCHED_HMP
        /*
         * Bail out if there are no nohz CPUs in our
         * HMP domain, since we will move tasks between
         * domains through wakeup and force balancing
         * as necessary based upon task load.
         */
        if (cpumask_first_and(nohz.idle_cpus_mask,
                        &((struct hmp_domain *)hmp_cpu_domain(cpu))->cpus) >= nr_cpu_ids)
                return 0;
#endif

        if (rq->nr_running >= 2)
                goto need_kick;

        rcu_read_lock();
        for_each_domain(cpu, sd) {
                struct sched_group *sg = sd->groups;
                struct sched_group_power *sgp = sg->sgp;
                int nr_busy = atomic_read(&sgp->nr_busy_cpus);

                if (sd->flags & SD_SHARE_PKG_RESOURCES && nr_busy > 1)
                        goto need_kick_unlock;

                if (sd->flags & SD_ASYM_PACKING && nr_busy != sg->group_weight
                    && (cpumask_first_and(nohz.idle_cpus_mask,
                                          sched_domain_span(sd)) < cpu))
                        goto need_kick_unlock;

                if (!(sd->flags & (SD_SHARE_PKG_RESOURCES | SD_ASYM_PACKING)))
                        break;
        }
        rcu_read_unlock();
        return 0;

need_kick_unlock:
        rcu_read_unlock();
need_kick:
        return 1;
}
#else
static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
#endif

#ifdef CONFIG_SCHED_HMP
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT

/* 
 * Heterogenous Multi-Processor (HMP) - Declaration and Useful Macro
 */

/* Function Declaration */
static int hmp_up_stable(int cpu);
static int hmp_down_stable(int cpu);
static unsigned int hmp_up_migration(int cpu, int *target_cpu, struct sched_entity *se,
                    struct clb_env *clbenv);
static unsigned int hmp_down_migration(int cpu, int *target_cpu, struct sched_entity *se,
                    struct clb_env *clbenv);

#define hmp_caller_is_gb(caller) ((HMP_GB == caller)?1:0)

#define hmp_cpu_is_fast(cpu) cpumask_test_cpu(cpu,&hmp_fast_cpu_mask)
#define hmp_cpu_is_slow(cpu) cpumask_test_cpu(cpu,&hmp_slow_cpu_mask)
#define hmp_cpu_stable(cpu) (hmp_cpu_is_fast(cpu)? \
                        hmp_up_stable(cpu):hmp_down_stable(cpu))

#define hmp_inc(v) ((v) + 1)
#define hmp_dec(v) ((v) - 1)
#define hmp_pos(v) ((v) < (0) ? (0) : (v))

#define task_created(f) ((SD_BALANCE_EXEC == f || SD_BALANCE_FORK == f)?1:0)
#define task_cpus_allowed(mask,p) cpumask_intersects(mask,tsk_cpus_allowed(p))
#define task_slow_cpu_allowed(p) task_cpus_allowed(&hmp_slow_cpu_mask,p)
#define task_fast_cpu_allowed(p) task_cpus_allowed(&hmp_fast_cpu_mask,p)

/* 
 * Heterogenous Multi-Processor (HMP) - Utility Function
 */

/*
 * These functions add next up/down migration delay that prevents the task from 
 * doing another migration in the same direction until the delay has expired.
 */
static int hmp_up_stable(int cpu)
{
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        u64 now = cfs_rq_clock_task(cfs_rq);
        if (((now - hmp_last_up_migration(cpu)) >> 10) < hmp_next_up_threshold)
                return 0;
        return 1;
}

static int hmp_down_stable(int cpu)
{
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        u64 now = cfs_rq_clock_task(cfs_rq);
        if (((now - hmp_last_down_migration(cpu)) >> 10) < hmp_next_down_threshold)
                return 0;
        return 1;
}

/* Select the most appropriate CPU from hmp cluster */
static unsigned int hmp_select_cpu(unsigned int caller, struct task_struct *p,
                        struct cpumask *mask, int prev)
{
        int curr = 0;
        int target = NR_CPUS;
        unsigned long curr_wload = 0;
        unsigned long target_wload = 0;
        struct cpumask srcp;
        cpumask_and(&srcp, cpu_online_mask, mask);
        target = cpumask_any_and(&srcp, tsk_cpus_allowed(p));
        if (NR_CPUS == target)
                goto out;
                
        /* 
         * RT class is taken into account because CPU load is multiplied 
         * by the total number of CPU runnable tasks that includes RT tasks.
         */
        target_wload = hmp_inc(cfs_load(target));
        target_wload += cfs_pending_load(target);
        target_wload *= rq_length(target);
        for_each_cpu(curr, mask) {
                /* Check CPU status and task affinity */
                if(!cpu_online(curr) || !cpumask_test_cpu(curr, tsk_cpus_allowed(p)))
                        continue;

                /* For global load balancing, unstable CPU will be bypassed */
                if(hmp_caller_is_gb(caller) && !hmp_cpu_stable(curr))
                        continue;

                curr_wload = hmp_inc(cfs_load(curr));
                curr_wload += cfs_pending_load(curr);
                curr_wload *= rq_length(curr);
                if(curr_wload < target_wload) {
                        target_wload = curr_wload;
                        target = curr;
                } else if(curr_wload == target_wload && curr == prev) {
                        target = curr;
                }
        }

out:
        return target;
}

/* 
 * Heterogenous Multi-Processor (HMP) - Task Runqueue Selection
 */
 
/* This function enhances the original task selection function */
static int hmp_select_task_rq_fair(int sd_flag, struct task_struct *p,
                        int prev_cpu, int new_cpu) 
{
#ifdef CONFIG_HMP_TASK_ASSIGNMENT
        int step = 0;
        struct sched_entity *se = &p->se;
        int B_target = NR_CPUS;
        int L_target = NR_CPUS;
        struct clb_env clbenv;
 
#ifdef CONFIG_HMP_TRACER
        int cpu = 0;
        for_each_online_cpu(cpu)
                trace_sched_cfs_runnable_load(cpu,cfs_load(cpu),cfs_length(cpu));
#endif

        // error handling
        if (prev_cpu >= NR_CPUS)
                return new_cpu;

        /* 
         * Skip all the checks if only one CPU is online. 
         * Otherwise, select the most appropriate CPU from cluster.
         */
        if (num_online_cpus() == 1)
                goto out;
        B_target = hmp_select_cpu(HMP_SELECT_RQ,p,&hmp_fast_cpu_mask,prev_cpu);
        L_target = hmp_select_cpu(HMP_SELECT_RQ,p,&hmp_slow_cpu_mask,prev_cpu);

        /* 
         * Only one cluster exists or only one cluster is allowed for this task 
         * Case 1: return the runqueue whose load is minimum
         * Case 2: return original CFS runqueue selection result
         */
#ifdef CONFIG_HMP_DISCARD_CFS_SELECTION_RESULT
        if(NR_CPUS == B_target && NR_CPUS == L_target)
                goto out;
        if(NR_CPUS == B_target)
                goto select_slow;
        if(NR_CPUS == L_target)
                goto select_fast;
#else
        if(NR_CPUS == B_target || NR_CPUS == L_target)
                goto out;
#endif

        /* 
         * Two clusters exist and both clusters are allowed for this task 
         * Step 1: Move newly created task to the cpu where no tasks are running 
         * Step 2: Migrate heavy-load task to big
         * Step 3: Migrate light-load task to LITTLE
         * Step 4: Make sure the task stays in its previous hmp domain
         */
        step = 1;
        if (task_created(sd_flag) && !task_low_priority(p->prio)) {
                if (!rq_length(B_target))
                        goto select_fast;
                if (!rq_length(L_target))
                        goto select_slow;
        }
        memset(&clbenv, 0, sizeof(clbenv));
        clbenv.flags |= HMP_SELECT_RQ;
        clbenv.lcpus = &hmp_slow_cpu_mask;
        clbenv.bcpus = &hmp_fast_cpu_mask;
        clbenv.ltarget = L_target;
        clbenv.btarget = B_target;
        sched_update_clbstats(&clbenv);
        step = 2;
        if (hmp_up_migration(L_target, &B_target, se, &clbenv))
                goto select_fast;
        step = 3;
        if (hmp_down_migration(B_target, &L_target, se, &clbenv))
                goto select_slow;
        step = 4;
        if (hmp_cpu_is_slow(prev_cpu))
                goto select_slow;
        goto select_fast;

select_fast:
        new_cpu = B_target;
        goto out;
select_slow:
        new_cpu = L_target;
        goto out;

out:

        // it happens when num_online_cpus=1
        if (new_cpu >= nr_cpu_ids)
        {
                //BUG_ON(1);
                new_cpu = prev_cpu;
        }

        cfs_nr_pending(new_cpu)++;
        cfs_pending_load(new_cpu) += se_load(se);
#ifdef CONFIG_HMP_TRACER
        trace_sched_hmp_load(clbenv.bstats.load_avg, clbenv.lstats.load_avg);
        trace_sched_hmp_select_task_rq(p,step,sd_flag,prev_cpu,new_cpu,
                        se_load(se),&clbenv.bstats,&clbenv.lstats);
#endif
#ifdef CONFIG_MET_SCHED_HMP
        HmpLoad(clbenv.bstats.load_avg, clbenv.lstats.load_avg);
#endif
#endif /* CONFIG_HMP_TASK_ASSIGNMENT */
        return new_cpu;
}

/* 
 * Heterogenous Multi-Processor (HMP) - Task Dynamic Migration Threshold
 */

/*
 * If the workload between clusters is not balanced, adjust migration 
 * threshold in an attempt to move task to the cluster where the workload 
 * is not heavy
 */

/*
 * According to ARM's cpu_efficiency table, the computing power of CA15 and 
 * CA7 are 3891 and 2048 respectively. Thus, we assume big has twice the 
 * computing power of LITTLE
 */

#define HMP_RATIO(v) ((v)*17/10)

#define hmp_fast_cpu_has_spare_cycles(B,cpu_load) (cpu_load < \
                        (HMP_RATIO(B->cpu_capacity) - (B->cpu_capacity >> 2)))

#define hmp_task_fast_cpu_afford(B,se,cpu) (B->acap > 0 \
                        && hmp_fast_cpu_has_spare_cycles(B,se_load(se) + cfs_load(cpu)))

#define hmp_fast_cpu_oversubscribed(caller,B,se,cpu) \
                        (hmp_caller_is_gb(caller)? \
                        !hmp_fast_cpu_has_spare_cycles(B,cfs_load(cpu)): \
                        !hmp_task_fast_cpu_afford(B,se,cpu))

#define hmp_task_slow_cpu_afford(L,se) \
                        (L->acap > 0 && L->acap >= se_load(se))

/* Macro used by low-priorty task filter */
#define hmp_low_prio_task_up_rejected(p,B,L) \
                        (task_low_priority(p->prio) && \
                        (B->ntask >= B->ncpu || 0 != L->nr_normal_prio_task) && \
                         (p->se.avg.load_avg_ratio < 800))

#define hmp_low_prio_task_down_allowed(p,B,L) \
                        (task_low_priority(p->prio) && !B->nr_dequeuing_low_prio && \
                        B->ntask >= B->ncpu && 0 != L->nr_normal_prio_task && \
                        (p->se.avg.load_avg_ratio < 800))

/* Migration check result */
#define HMP_BIG_NOT_OVERSUBSCRIBED           (0x01)
#define HMP_BIG_CAPACITY_INSUFFICIENT        (0x02)
#define HMP_LITTLE_CAPACITY_INSUFFICIENT     (0x04)
#define HMP_LOW_PRIORITY_FILTER              (0x08)
#define HMP_BIG_BUSY_LITTLE_IDLE             (0x10)
#define HMP_BIG_IDLE                         (0x20)
#define HMP_MIGRATION_APPROVED              (0x100)
#define HMP_TASK_UP_MIGRATION               (0x200)
#define HMP_TASK_DOWN_MIGRATION             (0x400)

/* Migration statistics */
#ifdef CONFIG_HMP_TRACER
struct hmp_statisic hmp_stats;
#endif

static inline void hmp_dynamic_threshold(struct clb_env *clbenv)
{
        struct clb_stats *L = &clbenv->lstats;
        struct clb_stats *B = &clbenv->bstats;
        unsigned int hmp_threshold_diff = hmp_up_threshold - hmp_down_threshold;
        unsigned int B_normalized_acap = hmp_pos(HMP_RATIO(B->scaled_acap));
        unsigned int B_normalized_atask = hmp_pos(HMP_RATIO(B->scaled_atask));
        unsigned int L_normalized_acap = hmp_pos(L->scaled_acap);
        unsigned int L_normalized_atask = hmp_pos(L->scaled_atask);

#ifdef CONFIG_HMP_DYNAMIC_THRESHOLD
        L->threshold = hmp_threshold_diff;
        L->threshold *= hmp_inc(L_normalized_acap) * hmp_inc(L_normalized_atask);
        L->threshold /= hmp_inc(B_normalized_acap + L_normalized_acap);
        L->threshold /= hmp_inc(B_normalized_atask + L_normalized_atask);
        L->threshold = hmp_down_threshold + L->threshold;

        B->threshold = hmp_threshold_diff;
        B->threshold *= hmp_inc(B_normalized_acap) * hmp_inc(B_normalized_atask);
        B->threshold /= hmp_inc(B_normalized_acap + L_normalized_acap);
        B->threshold /= hmp_inc(B_normalized_atask + L_normalized_atask);
        B->threshold = hmp_up_threshold - B->threshold;
#else /* !CONFIG_HMP_DYNAMIC_THRESHOLD */
        clbenv->lstats.threshold = hmp_down_threshold; // down threshold
        clbenv->bstats.threshold = hmp_up_threshold; // up threshold
#endif /* CONFIG_HMP_DYNAMIC_THRESHOLD */

        mt_sched_printf("[%s]\tup/dl:%4d/%4d bcpu(%d):%d/%d, lcpu(%d):%d/%d\n", __func__,
                                        B->threshold, L->threshold,
                                        clbenv->btarget, clbenv->bstats.cpu_capacity, clbenv->bstats.cpu_power,
                                        clbenv->ltarget, clbenv->lstats.cpu_capacity, clbenv->lstats.cpu_power);
}

/* 
 * Check whether this task should be migrated to big
 * Briefly summarize the flow as below;
 * 1) Migration stabilizing
 * 1.5) Keep all cpu busy
 * 2) Filter low-priorty task
 * 3) Check CPU capacity
 * 4) Check dynamic migration threshold
 */
static unsigned int hmp_up_migration(int cpu, int *target_cpu, struct sched_entity *se,
                                     struct clb_env *clbenv)
{
        struct task_struct *p = task_of(se);
        struct clb_stats *L, *B;
        struct mcheck *check;
        int curr_cpu = cpu;
        unsigned int caller = clbenv->flags;

        L = &clbenv->lstats;
        B = &clbenv->bstats;
        check = &clbenv->mcheck;

        check->status = clbenv->flags;
        check->status |= HMP_TASK_UP_MIGRATION;
        check->result = 0;
        
        /* 
         * No migration is needed if
         * 1) There is only one cluster 
         * 2) Task is already in big cluster
         * 3) It violates task affinity
         */
        if (!L->ncpu || !B->ncpu
                || cpumask_test_cpu(curr_cpu, clbenv->bcpus)
                || !cpumask_intersects(clbenv->bcpus, tsk_cpus_allowed(p)))
                goto out;

        /* 
         * [1] Migration stabilizing
         * Let the task load settle before doing another up migration.
         * It can prevent a bunch of tasks from migrating to a unstable CPU.
         */
        if (!hmp_up_stable(*target_cpu))
                goto out;

        /* [2] Filter low-priorty task */
#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
        if (hmp_low_prio_task_up_rejected(p,B,L)) {
                check->status |= HMP_LOW_PRIORITY_FILTER;       
                goto trace;
        }
#endif

        // [2.5]if big is idle, just go to big
        if (rq_length(*target_cpu)==0)
        {
                check->status |= HMP_BIG_IDLE;
                check->status |= HMP_MIGRATION_APPROVED;
                check->result = 1;
                goto trace;
        }

        /*
         * [3] Check CPU capacity
         * Forbid up-migration if big CPU can't handle this task
         */
        if (!hmp_task_fast_cpu_afford(B,se,*target_cpu)) {
                check->status |= HMP_BIG_CAPACITY_INSUFFICIENT;
                goto trace;
        }

        /* 
         * [4] Check dynamic migration threshold
         * Migrate task from LITTLE to big if load is greater than up-threshold
         */
        if (se_load(se) > B->threshold) {
                check->status |= HMP_MIGRATION_APPROVED;
                check->result = 1;
        }

trace:
#ifdef CONFIG_HMP_TRACER
        if(check->result && hmp_caller_is_gb(caller))
                hmp_stats.nr_force_up++;
        trace_sched_hmp_stats(&hmp_stats);
        trace_sched_dynamic_threshold(task_of(se),B->threshold,check->status,
                        curr_cpu,*target_cpu,se_load(se),B,L);
#endif
#ifdef CONFIG_MET_SCHED_HMP
        TaskTh(B->threshold,L->threshold);
        HmpStat(&hmp_stats);
#endif
out:
        return check->result;
}

/* 
 * Check whether this task should be migrated to LITTLE
 * Briefly summarize the flow as below;
 * 1) Migration stabilizing
 * 1.5) Keep all cpu busy
 * 2) Filter low-priorty task
 * 3) Check CPU capacity
 * 4) Check dynamic migration threshold
 */
static unsigned int hmp_down_migration(int cpu, int *target_cpu, struct sched_entity *se,
                                       struct clb_env *clbenv)
{
        struct task_struct *p = task_of(se);
        struct clb_stats *L, *B;
        struct mcheck *check;
        int curr_cpu = cpu;
        unsigned int caller = clbenv->flags;

        L = &clbenv->lstats;
        B = &clbenv->bstats;
        check = &clbenv->mcheck;

        check->status = caller;
        check->status |= HMP_TASK_DOWN_MIGRATION;
        check->result = 0;

        /* 
         * No migration is needed if
         * 1) There is only one cluster 
         * 2) Task is already in LITTLE cluster
         * 3) It violates task affinity
         */
        if (!L->ncpu || !B->ncpu
                || cpumask_test_cpu(curr_cpu, clbenv->lcpus)
                || !cpumask_intersects(clbenv->lcpus, tsk_cpus_allowed(p)))
                goto out;

        /* 
         * [1] Migration stabilizing
         * Let the task load settle before doing another down migration.
         * It can prevent a bunch of tasks from migrating to a unstable CPU.
         */
        if (!hmp_down_stable(*target_cpu))
                goto out;

        // [1.5]if big is busy and little is idle, just go to little
        if (rq_length(*target_cpu)==0 && caller == HMP_SELECT_RQ && rq_length(curr_cpu)>0)
        {
                check->status |= HMP_BIG_BUSY_LITTLE_IDLE;
                check->status |= HMP_MIGRATION_APPROVED;
                check->result = 1;
                goto trace;
        }

        /* [2] Filter low-priorty task */
#ifdef CONFIG_SCHED_HMP_PRIO_FILTER     
        if (hmp_low_prio_task_down_allowed(p,B,L)) {
                cfs_nr_dequeuing_low_prio(curr_cpu)++;
                check->status |= HMP_LOW_PRIORITY_FILTER;
                check->status |= HMP_MIGRATION_APPROVED;
                check->result = 1;
                goto trace;
        }
#endif

        /* 
         * [3] Check CPU capacity
         * Forbid down-migration if either of the following conditions is true
         * 1) big cpu is not oversubscribed (if big CPU seems to have spare 
         *    cycles, do not force this task to run on LITTLE CPU, but 
         *    keep it staying in its previous cluster instead)
         * 2) LITTLE cpu doesn't have available capacity for this new task
         */
        if (!hmp_fast_cpu_oversubscribed(caller,B,se,curr_cpu)) {
                check->status |= HMP_BIG_NOT_OVERSUBSCRIBED;
                goto trace;
        }

        if (!hmp_task_slow_cpu_afford(L,se)) {
                check->status |= HMP_LITTLE_CAPACITY_INSUFFICIENT;
                goto trace;
        }

        /* 
         * [4] Check dynamic migration threshold
         * Migrate task from big to LITTLE if load ratio is less than 
         * or equal to down-threshold
         */              
        if (L->threshold >= se_load(se)) {
                check->status |= HMP_MIGRATION_APPROVED;
                check->result = 1;
        }

trace:
#ifdef CONFIG_HMP_TRACER
        if (check->result && hmp_caller_is_gb(caller))
                hmp_stats.nr_force_down++;
        trace_sched_hmp_stats(&hmp_stats);
        trace_sched_dynamic_threshold(task_of(se),L->threshold,check->status,
                        curr_cpu,*target_cpu,se_load(se),B,L);
#endif
#ifdef CONFIG_MET_SCHED_HMP
        TaskTh(B->threshold,L->threshold);
        HmpStat(&hmp_stats);
#endif
out:
        return check->result;
}
#else /* CONFIG_SCHED_HMP_ENHANCEMENT */
/* Check if task should migrate to a faster cpu */
static unsigned int hmp_up_migration(int cpu, int *target_cpu, struct sched_entity *se)
{
        struct task_struct *p = task_of(se);
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        u64 now;

        if (target_cpu)
                *target_cpu = NR_CPUS;

        if (hmp_cpu_is_fastest(cpu))
                return 0;

#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
        /* Filter by task priority */
        if (p->prio >= hmp_up_prio)
                return 0;
#endif
        if (se->avg.load_avg_ratio < hmp_up_threshold)
                return 0;

        /* Let the task load settle before doing another up migration */
        now = cfs_rq_clock_task(cfs_rq);
        if (((now - se->avg.hmp_last_up_migration) >> 10)
                                        < hmp_next_up_threshold)
                return 0;

        /* Target domain load < 94% */
        if (hmp_domain_min_load(hmp_faster_domain(cpu), target_cpu)
                        > NICE_0_LOAD-64)
                return 0;

        if (cpumask_intersects(&hmp_faster_domain(cpu)->cpus,
                        tsk_cpus_allowed(p)))
                return 1;

        return 0;
}

/* Check if task should migrate to a slower cpu */
static unsigned int hmp_down_migration(int cpu, struct sched_entity *se)
{
        struct task_struct *p = task_of(se);
        struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
        u64 now;

        if (hmp_cpu_is_slowest(cpu))
                return 0;

#ifdef CONFIG_SCHED_HMP_PRIO_FILTER
        /* Filter by task priority */
        if ((p->prio >= hmp_up_prio) &&
                cpumask_intersects(&hmp_slower_domain(cpu)->cpus,
                                        tsk_cpus_allowed(p))) {
                return 1;
        }
#endif

        /* Let the task load settle before doing another down migration */
        now = cfs_rq_clock_task(cfs_rq);
        if (((now - se->avg.hmp_last_down_migration) >> 10)
                                        < hmp_next_down_threshold)
                return 0;

        if (cpumask_intersects(&hmp_slower_domain(cpu)->cpus,
                                        tsk_cpus_allowed(p))
                && se->avg.load_avg_ratio < hmp_down_threshold) {
                return 1;
        }
        return 0;
}
#endif /* CONFIG_SCHED_HMP_ENHANCEMENT */

/*
 * hmp_can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
 * Ideally this function should be merged with can_migrate_task() to avoid
 * redundant code.
 */
static int hmp_can_migrate_task(struct task_struct *p, struct lb_env *env)
{
        int tsk_cache_hot = 0;

        /*
         * We do not migrate tasks that are:
         * 1) running (obviously), or
         * 2) cannot be migrated to this CPU due to cpus_allowed
         */
        if (!cpumask_test_cpu(env->dst_cpu, tsk_cpus_allowed(p))) {
                schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
                return 0;
        }
        env->flags &= ~LBF_ALL_PINNED;

        if (task_running(env->src_rq, p)) {
                schedstat_inc(p, se.statistics.nr_failed_migrations_running);
                return 0;
        }

        /*
         * Aggressive migration if:
         * 1) task is cache cold, or
         * 2) too many balance attempts have failed.
         */

#if defined(CONFIG_MT_LOAD_BALANCE_ENHANCEMENT)
        tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd, env->mt_check_cache_in_idle);
#else
        tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd);
#endif
        if (!tsk_cache_hot ||
                env->sd->nr_balance_failed > env->sd->cache_nice_tries) {
#ifdef CONFIG_SCHEDSTATS
                if (tsk_cache_hot) {
                        schedstat_inc(env->sd, lb_hot_gained[env->idle]);
                        schedstat_inc(p, se.statistics.nr_forced_migrations);
                }
#endif
                return 1;
        }

        return 1;
}

/*
 * move_specific_task tries to move a specific task.
 * Returns 1 if successful and 0 otherwise.
 * Called with both runqueues locked.
 */
static int move_specific_task(struct lb_env *env, struct task_struct *pm)
{
        struct task_struct *p, *n;

        list_for_each_entry_safe(p, n, &env->src_rq->cfs_tasks, se.group_node) {
        if (throttled_lb_pair(task_group(p), env->src_rq->cpu,
                                env->dst_cpu))
                continue;

                if (!hmp_can_migrate_task(p, env))
                        continue;
                /* Check if we found the right task */
                if (p != pm)
                        continue;

                move_task(p, env);
                /*
                 * Right now, this is only the third place move_task()
                 * is called, so we can safely collect move_task()
                 * stats here rather than inside move_task().
                 */
                schedstat_inc(env->sd, lb_gained[env->idle]);
                return 1;
        }
        return 0;
}

/*
 * hmp_active_task_migration_cpu_stop is run by cpu stopper and used to
 * migrate a specific task from one runqueue to another.
 * hmp_force_up_migration uses this to push a currently running task
 * off a runqueue.
 * Based on active_load_balance_stop_cpu and can potentially be merged.
 */
static int hmp_active_task_migration_cpu_stop(void *data)
{
        struct rq *busiest_rq = data;
        struct task_struct *p = busiest_rq->migrate_task;
        int busiest_cpu = cpu_of(busiest_rq);
        int target_cpu = busiest_rq->push_cpu;
        struct rq *target_rq = cpu_rq(target_cpu);
        struct sched_domain *sd;

        raw_spin_lock_irq(&busiest_rq->lock);
        /* make sure the requested cpu hasn't gone down in the meantime */
        if (unlikely(busiest_cpu != smp_processor_id() ||
                !busiest_rq->active_balance)) {
                goto out_unlock;
        }
        /* Is there any task to move? */
        if (busiest_rq->nr_running <= 1)
                goto out_unlock;
        /* Task has migrated meanwhile, abort forced migration */
        if (task_rq(p) != busiest_rq)
                goto out_unlock;
        /*
         * This condition is "impossible", if it occurs
         * we need to fix it. Originally reported by
         * Bjorn Helgaas on a 128-cpu setup.
         */
        BUG_ON(busiest_rq == target_rq);

        /* move a task from busiest_rq to target_rq */
        double_lock_balance(busiest_rq, target_rq);

        /* Search for an sd spanning us and the target CPU. */
        rcu_read_lock();
        for_each_domain(target_cpu, sd) {
                if (cpumask_test_cpu(busiest_cpu, sched_domain_span(sd)))
                        break;
        }

        if (likely(sd)) {
                struct lb_env env = {
                        .sd             = sd,
                        .dst_cpu        = target_cpu,
                        .dst_rq         = target_rq,
                        .src_cpu        = busiest_rq->cpu,
                        .src_rq         = busiest_rq,
                        .idle           = CPU_IDLE,
                };

                schedstat_inc(sd, alb_count);

                if (move_specific_task(&env, p))
                        schedstat_inc(sd, alb_pushed);
                else
                        schedstat_inc(sd, alb_failed);
        }
        rcu_read_unlock();
        double_unlock_balance(busiest_rq, target_rq);
out_unlock:
        busiest_rq->active_balance = 0;
        raw_spin_unlock_irq(&busiest_rq->lock);
        return 0;
}

static DEFINE_SPINLOCK(hmp_force_migration);
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
/* 
 * Heterogenous Multi-Processor (HMP) Global Load Balance
 */

/* 
 * According to Linaro's comment, we should only check the currently running 
 * tasks because selecting other tasks for migration will require extensive 
 * book keeping.
 */
#ifdef CONFIG_HMP_GLOBAL_BALANCE
static void hmp_force_down_migration(int this_cpu)
{
        int curr_cpu, target_cpu;
        struct sched_entity *se;
        struct rq *target;
        unsigned long flags;
        unsigned int force;
        struct task_struct *p;
        struct clb_env clbenv;

        /* Migrate light task from big to LITTLE */
        for_each_cpu(curr_cpu, &hmp_fast_cpu_mask) {
                /* Check whether CPU is online */
                if(!cpu_online(curr_cpu))
                        continue;

                force = 0;
                target = cpu_rq(curr_cpu);
                raw_spin_lock_irqsave(&target->lock, flags);
                se = target->cfs.curr;
                if (!se) {
                        raw_spin_unlock_irqrestore(&target->lock, flags);
                        continue;
                }

                /* Find task entity */
                if (!entity_is_task(se)) {
                        struct cfs_rq *cfs_rq;
                        cfs_rq = group_cfs_rq(se);
                        while (cfs_rq) {
                                se = cfs_rq->curr;
                                cfs_rq = group_cfs_rq(se);
                        }
                }

                p = task_of(se);
                target_cpu = hmp_select_cpu(HMP_GB,p,&hmp_slow_cpu_mask,-1);
                if(NR_CPUS == target_cpu) {
                        raw_spin_unlock_irqrestore(&target->lock, flags);
                        continue;
                }

                /* Collect cluster information */
                memset(&clbenv, 0, sizeof(clbenv));
                clbenv.flags |= HMP_GB;
                clbenv.btarget = curr_cpu;
                clbenv.ltarget = target_cpu;
                clbenv.lcpus = &hmp_slow_cpu_mask;
                clbenv.bcpus = &hmp_fast_cpu_mask;
                sched_update_clbstats(&clbenv);

                /* Check migration threshold */
                if (!target->active_balance && 
                        hmp_down_migration(curr_cpu, &target_cpu, se, &clbenv)) {
                        target->active_balance = 1;
                        target->push_cpu = target_cpu;
                        target->migrate_task = p;
                        force = 1;
                        trace_sched_hmp_migrate(p, target->push_cpu, 1);
                        hmp_next_down_delay(&p->se, target->push_cpu);
                }
                raw_spin_unlock_irqrestore(&target->lock, flags);
                if (force) {
                        stop_one_cpu_nowait(cpu_of(target),
                                hmp_active_task_migration_cpu_stop,
                                target, &target->active_balance_work);
                }
        }
}
#endif /* CONFIG_HMP_GLOBAL_BALANCE */
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER 
u32 AVOID_FORCE_UP_MIGRATION_FROM_CPUX_TO_CPUY_COUNT[NR_CPUS][NR_CPUS];
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */

static void hmp_force_up_migration(int this_cpu)
{
        int curr_cpu, target_cpu;
        struct sched_entity *se;
        struct rq *target;
        unsigned long flags;
        unsigned int force;
        struct task_struct *p;
        struct clb_env clbenv;
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER 
        int push_cpu;
#endif

        if (!spin_trylock(&hmp_force_migration))
                return;

#ifdef CONFIG_HMP_TRACER
        for_each_online_cpu(curr_cpu)
                trace_sched_cfs_runnable_load(curr_cpu,cfs_load(curr_cpu),
                        cfs_length(curr_cpu));
#endif

        /* Migrate heavy task from LITTLE to big */
        for_each_cpu(curr_cpu, &hmp_slow_cpu_mask) {
                /* Check whether CPU is online */
                if(!cpu_online(curr_cpu))
                        continue;

                force = 0;
                target = cpu_rq(curr_cpu);
                raw_spin_lock_irqsave(&target->lock, flags);
                se = target->cfs.curr;
                if (!se) {
                        raw_spin_unlock_irqrestore(&target->lock, flags);
                        continue;
                }

                /* Find task entity */
                if (!entity_is_task(se)) {
                        struct cfs_rq *cfs_rq;
                        cfs_rq = group_cfs_rq(se);
                        while (cfs_rq) {
                                se = cfs_rq->curr;
                                cfs_rq = group_cfs_rq(se);
                        }
                }
                
                p = task_of(se);
                target_cpu = hmp_select_cpu(HMP_GB,p,&hmp_fast_cpu_mask,-1);
                if(NR_CPUS == target_cpu) {
                        raw_spin_unlock_irqrestore(&target->lock, flags);
                        continue;
                }

                /* Collect cluster information */       
                memset(&clbenv, 0, sizeof(clbenv));
                clbenv.flags |= HMP_GB;
                clbenv.ltarget = curr_cpu;
                clbenv.btarget = target_cpu;
                clbenv.lcpus = &hmp_slow_cpu_mask;
                clbenv.bcpus = &hmp_fast_cpu_mask;
                sched_update_clbstats(&clbenv);

#ifdef CONFIG_HMP_LAZY_BALANCE  
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
                if (PA_ENABLE && LB_ENABLE) {
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
                        if (is_light_task(p) && !is_buddy_busy(per_cpu(sd_pack_buddy, curr_cpu))) {
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER  
                                push_cpu = hmp_select_cpu(HMP_GB,p,&hmp_fast_cpu_mask,-1);
                                if (hmp_cpu_is_fast(push_cpu)) {
                                        AVOID_FORCE_UP_MIGRATION_FROM_CPUX_TO_CPUY_COUNT[curr_cpu][push_cpu]++;
#ifdef CONFIG_HMP_TRACER
                                        trace_sched_power_aware_active(POWER_AWARE_ACTIVE_MODULE_AVOID_FORCE_UP_FORM_CPUX_TO_CPUY, p->pid, curr_cpu, push_cpu);
#endif /* CONFIG_HMP_TRACER */
                                }
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
                                goto out_force_up;
                        }
#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER         
                }
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
#endif /* CONFIG_HMP_LAZY_BALANCE */

                /* Check migration threshold */
                if (!target->active_balance &&
                        hmp_up_migration(curr_cpu, &target_cpu, se, &clbenv)) {
                        target->active_balance = 1;
                        target->push_cpu = target_cpu;
                        target->migrate_task = p;
                        force = 1;
                        trace_sched_hmp_migrate(p, target->push_cpu, 1);
                        hmp_next_up_delay(&p->se, target->push_cpu);
                }

#ifdef CONFIG_HMP_LAZY_BALANCE
out_force_up:    
#endif /* CONFIG_HMP_LAZY_BALANCE */

                raw_spin_unlock_irqrestore(&target->lock, flags);
                if (force) {
                        stop_one_cpu_nowait(cpu_of(target),
                                hmp_active_task_migration_cpu_stop,
                                target, &target->active_balance_work);
                }
        }

#ifdef CONFIG_HMP_GLOBAL_BALANCE
        hmp_force_down_migration(this_cpu);
#endif
#ifdef CONFIG_HMP_TRACER
        trace_sched_hmp_load(clbenv.bstats.load_avg, clbenv.lstats.load_avg);
#endif
        spin_unlock(&hmp_force_migration);
}
#else /* CONFIG_SCHED_HMP_ENHANCEMENT */
/*
 * hmp_force_up_migration checks runqueues for tasks that need to
 * be actively migrated to a faster cpu.
 */
static void hmp_force_up_migration(int this_cpu)
{
        int cpu, target_cpu;
        struct sched_entity *curr;
        struct rq *target;
        unsigned long flags;
        unsigned int force;
        struct task_struct *p;

        if (!spin_trylock(&hmp_force_migration))
                return;
        for_each_online_cpu(cpu) {
                force = 0;
                target = cpu_rq(cpu);
                raw_spin_lock_irqsave(&target->lock, flags);
                curr = target->cfs.curr;
                if (!curr) {
                        raw_spin_unlock_irqrestore(&target->lock, flags);
                        continue;
                }
                if (!entity_is_task(curr)) {
                        struct cfs_rq *cfs_rq;

                        cfs_rq = group_cfs_rq(curr);
                        while (cfs_rq) {
                                curr = cfs_rq->curr;
                                cfs_rq = group_cfs_rq(curr);
                        }
                }
                p = task_of(curr);
                if (hmp_up_migration(cpu, &target_cpu, curr)) {
                        if (!target->active_balance) {
                                target->active_balance = 1;
                                target->push_cpu = target_cpu;
                                target->migrate_task = p;
                                force = 1;
                                trace_sched_hmp_migrate(p, target->push_cpu, 1);
                                hmp_next_up_delay(&p->se, target->push_cpu);
                        }
                }
                if (!force && !target->active_balance) {
                        /*
                         * For now we just check the currently running task.
                         * Selecting the lightest task for offloading will
                         * require extensive book keeping.
                         */
                        target->push_cpu = hmp_offload_down(cpu, curr);
                        if (target->push_cpu < NR_CPUS) {
                                target->active_balance = 1;
                                target->migrate_task = p;
                                force = 1;
                                trace_sched_hmp_migrate(p, target->push_cpu, 2);
                                hmp_next_down_delay(&p->se, target->push_cpu);
                        }
                }
                raw_spin_unlock_irqrestore(&target->lock, flags);
                if (force)
                        stop_one_cpu_nowait(cpu_of(target),
                                hmp_active_task_migration_cpu_stop,
                                target, &target->active_balance_work);
        }
        spin_unlock(&hmp_force_migration);
}
#endif /* CONFIG_SCHED_HMP_ENHANCEMENT */
#else
static void hmp_force_up_migration(int this_cpu) { }
#endif /* CONFIG_SCHED_HMP */

/*
 * run_rebalance_domains is triggered when needed from the scheduler tick.
 * Also triggered for nohz idle balancing (with nohz_balancing_kick set).
 */
static void run_rebalance_domains(struct softirq_action *h)
{
        int this_cpu = smp_processor_id();
        struct rq *this_rq = cpu_rq(this_cpu);
        enum cpu_idle_type idle = this_rq->idle_balance ?
                                                CPU_IDLE : CPU_NOT_IDLE;

        hmp_force_up_migration(this_cpu);

        rebalance_domains(this_cpu, idle);

        /*
         * If this cpu has a pending nohz_balance_kick, then do the
         * balancing on behalf of the other idle cpus whose ticks are
         * stopped.
         */
        nohz_idle_balance(this_cpu, idle);
}

static inline int on_null_domain(int cpu)
{
        return !rcu_dereference_sched(cpu_rq(cpu)->sd);
}

/*
 * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
 */
void trigger_load_balance(struct rq *rq, int cpu)
{
        /* Don't need to rebalance while attached to NULL domain */
        if (time_after_eq(jiffies, rq->next_balance) &&
            likely(!on_null_domain(cpu)))
                raise_softirq(SCHED_SOFTIRQ);
#ifdef CONFIG_NO_HZ_COMMON
        if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
                nohz_balancer_kick(cpu);
#endif
}

static void rq_online_fair(struct rq *rq)
{
#ifdef CONFIG_SCHED_HMP
        hmp_online_cpu(rq->cpu);
#endif
        update_sysctl();
}

static void rq_offline_fair(struct rq *rq)
{
#ifdef CONFIG_SCHED_HMP
        hmp_offline_cpu(rq->cpu);
#endif
        update_sysctl();

        /* Ensure any throttled groups are reachable by pick_next_task */
        unthrottle_offline_cfs_rqs(rq);
}

#endif /* CONFIG_SMP */

/*
 * scheduler tick hitting a task of our scheduling class:
 */
static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
{
        struct cfs_rq *cfs_rq;
        struct sched_entity *se = &curr->se;

        for_each_sched_entity(se) {
                cfs_rq = cfs_rq_of(se);
                entity_tick(cfs_rq, se, queued);
        }

        if (sched_feat_numa(NUMA))
                task_tick_numa(rq, curr);

        update_rq_runnable_avg(rq, 1);
}

/*
 * called on fork with the child task as argument from the parent's context
 *  - child not yet on the tasklist
 *  - preemption disabled
 */
static void task_fork_fair(struct task_struct *p)
{
        struct cfs_rq *cfs_rq;
        struct sched_entity *se = &p->se, *curr;
        int this_cpu = smp_processor_id();
        struct rq *rq = this_rq();
        unsigned long flags;

        raw_spin_lock_irqsave(&rq->lock, flags);

        update_rq_clock(rq);

        cfs_rq = task_cfs_rq(current);
        curr = cfs_rq->curr;

        /*
         * Not only the cpu but also the task_group of the parent might have
         * been changed after parent->se.parent,cfs_rq were copied to
         * child->se.parent,cfs_rq. So call __set_task_cpu() to make those
         * of child point to valid ones.
         */
        rcu_read_lock();
        __set_task_cpu(p, this_cpu);
        rcu_read_unlock();

        update_curr(cfs_rq);

        if (curr)
                se->vruntime = curr->vruntime;
        place_entity(cfs_rq, se, 1);

        if (sysctl_sched_child_runs_first && curr && entity_before(curr, se)) {
                /*
                 * Upon rescheduling, sched_class::put_prev_task() will place
                 * 'current' within the tree based on its new key value.
                 */
                swap(curr->vruntime, se->vruntime);
                resched_task(rq->curr);
        }

        se->vruntime -= cfs_rq->min_vruntime;

        raw_spin_unlock_irqrestore(&rq->lock, flags);
}

/*
 * Priority of the task has changed. Check to see if we preempt
 * the current task.
 */
static void
prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
{
        if (!p->se.on_rq)
                return;

        /*
         * Reschedule if we are currently running on this runqueue and
         * our priority decreased, or if we are not currently running on
         * this runqueue and our priority is higher than the current's
         */
        if (rq->curr == p) {
                if (p->prio > oldprio)
                        resched_task(rq->curr);
        } else
                check_preempt_curr(rq, p, 0);
}

static void switched_from_fair(struct rq *rq, struct task_struct *p)
{
        struct sched_entity *se = &p->se;
        struct cfs_rq *cfs_rq = cfs_rq_of(se);

        /*
         * Ensure the task's vruntime is normalized, so that when it's
         * switched back to the fair class the enqueue_entity(.flags=0) will
         * do the right thing.
         *
         * If it's on_rq, then the dequeue_entity(.flags=0) will already
         * have normalized the vruntime, if it's !on_rq, then only when
         * the task is sleeping will it still have non-normalized vruntime.
         */
        if (!p->on_rq && p->state != TASK_RUNNING) {
                /*
                 * Fix up our vruntime so that the current sleep doesn't
                 * cause 'unlimited' sleep bonus.
                 */
                place_entity(cfs_rq, se, 0);
                se->vruntime -= cfs_rq->min_vruntime;
        }

#ifdef CONFIG_SMP
        /*
        * Remove our load from contribution when we leave sched_fair
        * and ensure we don't carry in an old decay_count if we
        * switch back.
        */
        if (p->se.avg.decay_count) {
                struct cfs_rq *cfs_rq = cfs_rq_of(&p->se);
                __synchronize_entity_decay(&p->se);
                subtract_blocked_load_contrib(cfs_rq,
                                p->se.avg.load_avg_contrib);
        }
#endif
}

/*
 * We switched to the sched_fair class.
 */
static void switched_to_fair(struct rq *rq, struct task_struct *p)
{
        if (!p->se.on_rq)
                return;

        /*
         * We were most likely switched from sched_rt, so
         * kick off the schedule if running, otherwise just see
         * if we can still preempt the current task.
         */
        if (rq->curr == p)
                resched_task(rq->curr);
        else{
                /*
                When task p change priority form RT to normal priority 
                in switch_from_rt(), it might call pull_rt_task
                and potentially double_lock_balance will unlock rq.
                Task p might migrate to other CPU and result in task p is NOT at rq.
                In this case, it is not necessary to check preempt for rq. 
                (Because task p is NOT at rq anymore)
                and the migrate flow for task p will check preempt in enqueue flow.
                So bypass the check_preempt_curr.
                 */
                if (rq == task_rq(p)) {
                        check_preempt_curr(rq, p, 0);
                }
        }
}

/* Account for a task changing its policy or group.
 *
 * This routine is mostly called to set cfs_rq->curr field when a task
 * migrates between groups/classes.
 */
static void set_curr_task_fair(struct rq *rq)
{
        struct sched_entity *se = &rq->curr->se;

        for_each_sched_entity(se) {
                struct cfs_rq *cfs_rq = cfs_rq_of(se);

                set_next_entity(cfs_rq, se);
                /* ensure bandwidth has been allocated on our new cfs_rq */
                account_cfs_rq_runtime(cfs_rq, 0);
        }
}

void init_cfs_rq(struct cfs_rq *cfs_rq)
{
        cfs_rq->tasks_timeline = RB_ROOT;
        cfs_rq->min_vruntime = (u64)(-(1LL << 20));
#ifndef CONFIG_64BIT
        cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
#endif
#ifdef CONFIG_SMP
        atomic64_set(&cfs_rq->decay_counter, 1);
        atomic_long_set(&cfs_rq->removed_load, 0);
#endif
}

#ifdef CONFIG_FAIR_GROUP_SCHED
static void task_move_group_fair(struct task_struct *p, int on_rq)
{
        struct cfs_rq *cfs_rq;
        /*
         * If the task was not on the rq at the time of this cgroup movement
         * it must have been asleep, sleeping tasks keep their ->vruntime
         * absolute on their old rq until wakeup (needed for the fair sleeper
         * bonus in place_entity()).
         *
         * If it was on the rq, we've just 'preempted' it, which does convert
         * ->vruntime to a relative base.
         *
         * Make sure both cases convert their relative position when migrating
         * to another cgroup's rq. This does somewhat interfere with the
         * fair sleeper stuff for the first placement, but who cares.
         */
        /*
         * When !on_rq, vruntime of the task has usually NOT been normalized.
         * But there are some cases where it has already been normalized:
         *
         * - Moving a forked child which is waiting for being woken up by
         *   wake_up_new_task().
         * - Moving a task which has been woken up by try_to_wake_up() and
         *   waiting for actually being woken up by sched_ttwu_pending().
         *
         * To prevent boost or penalty in the new cfs_rq caused by delta
         * min_vruntime between the two cfs_rqs, we skip vruntime adjustment.
         */
        if (!on_rq && (!p->se.sum_exec_runtime || p->state == TASK_WAKING))
                on_rq = 1;

        if (!on_rq)
                p->se.vruntime -= cfs_rq_of(&p->se)->min_vruntime;
        set_task_rq(p, task_cpu(p));
        if (!on_rq) {
                cfs_rq = cfs_rq_of(&p->se);
                p->se.vruntime += cfs_rq->min_vruntime;
#ifdef CONFIG_SMP
                /*
                 * migrate_task_rq_fair() will have removed our previous
                 * contribution, but we must synchronize for ongoing future
                 * decay.
                 */
                p->se.avg.decay_count = atomic64_read(&cfs_rq->decay_counter);
                cfs_rq->blocked_load_avg += p->se.avg.load_avg_contrib;
#endif
        }
}

void free_fair_sched_group(struct task_group *tg)
{
        int i;

        destroy_cfs_bandwidth(tg_cfs_bandwidth(tg));

        for_each_possible_cpu(i) {
                if (tg->cfs_rq)
                        kfree(tg->cfs_rq[i]);
                if (tg->se)
                        kfree(tg->se[i]);
        }

        kfree(tg->cfs_rq);
        kfree(tg->se);
}

int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
{
        struct cfs_rq *cfs_rq;
        struct sched_entity *se;
        int i;

        tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
        if (!tg->cfs_rq)
                goto err;
        tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL);
        if (!tg->se)
                goto err;

        tg->shares = NICE_0_LOAD;

        init_cfs_bandwidth(tg_cfs_bandwidth(tg));

        for_each_possible_cpu(i) {
                cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
                                      GFP_KERNEL, cpu_to_node(i));
                if (!cfs_rq)
                        goto err;

                se = kzalloc_node(sizeof(struct sched_entity),
                                  GFP_KERNEL, cpu_to_node(i));
                if (!se)
                        goto err_free_rq;

                init_cfs_rq(cfs_rq);
                init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
        }

        return 1;

err_free_rq:
        kfree(cfs_rq);
err:
        return 0;
}

void unregister_fair_sched_group(struct task_group *tg, int cpu)
{
        struct rq *rq = cpu_rq(cpu);
        unsigned long flags;

        /*
        * Only empty task groups can be destroyed; so we can speculatively
        * check on_list without danger of it being re-added.
        */
        if (!tg->cfs_rq[cpu]->on_list)
                return;

        raw_spin_lock_irqsave(&rq->lock, flags);
        list_del_leaf_cfs_rq(tg->cfs_rq[cpu]);
        raw_spin_unlock_irqrestore(&rq->lock, flags);
}

void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
                        struct sched_entity *se, int cpu,
                        struct sched_entity *parent)
{
        struct rq *rq = cpu_rq(cpu);

        cfs_rq->tg = tg;
        cfs_rq->rq = rq;
        init_cfs_rq_runtime(cfs_rq);

        tg->cfs_rq[cpu] = cfs_rq;
        tg->se[cpu] = se;

        /* se could be NULL for root_task_group */
        if (!se)
                return;

        if (!parent)
                se->cfs_rq = &rq->cfs;
        else
                se->cfs_rq = parent->my_q;

        se->my_q = cfs_rq;
        /* guarantee group entities always have weight */
        update_load_set(&se->load, NICE_0_LOAD);
        se->parent = parent;
}

static DEFINE_MUTEX(shares_mutex);

int sched_group_set_shares(struct task_group *tg, unsigned long shares)
{
        int i;
        unsigned long flags;

        /*
         * We can't change the weight of the root cgroup.
         */
        if (!tg->se[0])
                return -EINVAL;

        shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES));

        mutex_lock(&shares_mutex);
        if (tg->shares == shares)
                goto done;

        tg->shares = shares;
        for_each_possible_cpu(i) {
                struct rq *rq = cpu_rq(i);
                struct sched_entity *se;

                se = tg->se[i];
                /* Propagate contribution to hierarchy */
                raw_spin_lock_irqsave(&rq->lock, flags);
                for_each_sched_entity(se)
                        update_cfs_shares(group_cfs_rq(se));
                raw_spin_unlock_irqrestore(&rq->lock, flags);
        }

done:
        mutex_unlock(&shares_mutex);
        return 0;
}
#else /* CONFIG_FAIR_GROUP_SCHED */

void free_fair_sched_group(struct task_group *tg) { }

int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
{
        return 1;
}

void unregister_fair_sched_group(struct task_group *tg, int cpu) { }

#endif /* CONFIG_FAIR_GROUP_SCHED */


static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task)
{
        struct sched_entity *se = &task->se;
        unsigned int rr_interval = 0;

        /*
         * Time slice is 0 for SCHED_OTHER tasks that are on an otherwise
         * idle runqueue:
         */
        if (rq->cfs.load.weight)
                rr_interval = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se));

        return rr_interval;
}

/*
 * All the scheduling class methods:
 */
const struct sched_class fair_sched_class = {
        .next                   = &idle_sched_class,
        .enqueue_task           = enqueue_task_fair,
        .dequeue_task           = dequeue_task_fair,
        .yield_task             = yield_task_fair,
        .yield_to_task          = yield_to_task_fair,

        .check_preempt_curr     = check_preempt_wakeup,

        .pick_next_task         = pick_next_task_fair,
        .put_prev_task          = put_prev_task_fair,

#ifdef CONFIG_SMP
        .select_task_rq         = select_task_rq_fair,
        .migrate_task_rq        = migrate_task_rq_fair,

        .rq_online              = rq_online_fair,
        .rq_offline             = rq_offline_fair,

        .task_waking            = task_waking_fair,
#endif

        .set_curr_task          = set_curr_task_fair,
        .task_tick              = task_tick_fair,
        .task_fork              = task_fork_fair,

        .prio_changed           = prio_changed_fair,
        .switched_from          = switched_from_fair,
        .switched_to            = switched_to_fair,

        .get_rr_interval        = get_rr_interval_fair,

#ifdef CONFIG_FAIR_GROUP_SCHED
        .task_move_group        = task_move_group_fair,
#endif
};

#ifdef CONFIG_SCHED_DEBUG
void print_cfs_stats(struct seq_file *m, int cpu)
{
        struct cfs_rq *cfs_rq;

        rcu_read_lock();
        for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
                print_cfs_rq(m, cpu, cfs_rq);
        rcu_read_unlock();
}
#endif

__init void init_sched_fair_class(void)
{
#ifdef CONFIG_SMP
        open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);

#ifdef CONFIG_NO_HZ_COMMON
        nohz.next_balance = jiffies;
        zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
        cpu_notifier(sched_ilb_notifier, 0);
#endif

        cmp_cputopo_domain_setup();
#ifdef CONFIG_SCHED_HMP
        hmp_cpu_mask_setup();
#endif
#endif /* SMP */
}

#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
static u32 cpufreq_calc_scale(u32 min, u32 max, u32 curr)
{
        u32 result = curr / max;
        return result;
}

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
DEFINE_PER_CPU(u32, FREQ_CPU);
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */

/* Called when the CPU Frequency is changed.
 * Once for each CPU.
 */
static int cpufreq_callback(struct notifier_block *nb,
                                        unsigned long val, void *data)
{
        struct cpufreq_freqs *freq = data;
        int cpu = freq->cpu;
        struct cpufreq_extents *extents;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        struct cpumask* mask;
        int id;
#endif

        if (freq->flags & CPUFREQ_CONST_LOOPS)
                return NOTIFY_OK;

        if (val != CPUFREQ_POSTCHANGE)
                return NOTIFY_OK;

        /* if dynamic load scale is disabled, set the load scale to 1.0 */
        if (!hmp_data.freqinvar_load_scale_enabled) {
                freq_scale[cpu].curr_scale = 1024;
                return NOTIFY_OK;
        }

        extents = &freq_scale[cpu];
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        if (extents->max < extents->const_max){
                extents->throttling=1;
        }
        else {
                extents->throttling=0;
        }       
#endif
        if (extents->flags & SCHED_LOAD_FREQINVAR_SINGLEFREQ) {
                /* If our governor was recognised as a single-freq governor,
                 * use 1.0
                 */
                extents->curr_scale = 1024;
        } else {
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
                extents->curr_scale = cpufreq_calc_scale(extents->min,
                                extents->const_max, freq->new);
#else
                extents->curr_scale = cpufreq_calc_scale(extents->min,
                                extents->max, freq->new);
#endif
        }

#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        mask = arch_cpu_is_big(cpu)?&hmp_fast_cpu_mask:&hmp_slow_cpu_mask;
        for_each_cpu(id, mask) 
                freq_scale[id].curr_scale = extents->curr_scale;
#endif

#if NR_CPUS == 4
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
        switch (cpu) {
        case 0:
        case 2:
                (extents + 1)->curr_scale = extents->curr_scale;
                break;

        case 1:
        case 3:
                (extents - 1)->curr_scale = extents->curr_scale;
                break;

        default:

                break;
        }
#endif
#endif

#ifdef CONFIG_HMP_POWER_AWARE_CONTROLLER
        per_cpu(FREQ_CPU, cpu) = freq->new;
#endif /* CONFIG_HMP_POWER_AWARE_CONTROLLER */
        return NOTIFY_OK;
}

/* Called when the CPUFreq governor is changed.
 * Only called for the CPUs which are actually changed by the
 * userspace.
 */
static int cpufreq_policy_callback(struct notifier_block *nb,
                                       unsigned long event, void *data)
{
        struct cpufreq_policy *policy = data;
        struct cpufreq_extents *extents;
        int cpu, singleFreq = 0;
        static const char performance_governor[] = "performance";
        static const char powersave_governor[] = "powersave";

        if (event == CPUFREQ_START)
                return 0;

        if (event != CPUFREQ_INCOMPATIBLE)
                return 0;

        /* CPUFreq governors do not accurately report the range of
         * CPU Frequencies they will choose from.
         * We recognise performance and powersave governors as
         * single-frequency only.
         */
        if (!strncmp(policy->governor->name, performance_governor,
                        strlen(performance_governor)) ||
                !strncmp(policy->governor->name, powersave_governor,
                                strlen(powersave_governor)))
                singleFreq = 1;

        /* Make sure that all CPUs impacted by this policy are
         * updated since we will only get a notification when the
         * user explicitly changes the policy on a CPU.
         */
        for_each_cpu(cpu, policy->cpus) {
                extents = &freq_scale[cpu];
                extents->max = policy->max >> SCHED_FREQSCALE_SHIFT;
                extents->min = policy->min >> SCHED_FREQSCALE_SHIFT;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
                extents->const_max = policy->cpuinfo.max_freq >> SCHED_FREQSCALE_SHIFT;
#endif
                if (!hmp_data.freqinvar_load_scale_enabled) {
                        extents->curr_scale = 1024;
                } else if (singleFreq) {
                        extents->flags |= SCHED_LOAD_FREQINVAR_SINGLEFREQ;
                        extents->curr_scale = 1024;
                } else {
                        extents->flags &= ~SCHED_LOAD_FREQINVAR_SINGLEFREQ;
#ifdef CONFIG_SCHED_HMP_ENHANCEMENT
                        extents->curr_scale = cpufreq_calc_scale(extents->min,
                                        extents->const_max, policy->cur);
#else
                        extents->curr_scale = cpufreq_calc_scale(extents->min,
                                        extents->max, policy->cur);
#endif
                }
        }

        return 0;
}

static struct notifier_block cpufreq_notifier = {
        .notifier_call  = cpufreq_callback,
};
static struct notifier_block cpufreq_policy_notifier = {
        .notifier_call  = cpufreq_policy_callback,
};

static int __init register_sched_cpufreq_notifier(void)
{
        int ret = 0;

        /* init safe defaults since there are no policies at registration */
        for (ret = 0; ret < CONFIG_NR_CPUS; ret++) {
                /* safe defaults */
                freq_scale[ret].max = 1024;
                freq_scale[ret].min = 1024;
                freq_scale[ret].curr_scale = 1024;
        }

        pr_info("sched: registering cpufreq notifiers for scale-invariant loads\n");
        ret = cpufreq_register_notifier(&cpufreq_policy_notifier,
                        CPUFREQ_POLICY_NOTIFIER);

        if (ret != -EINVAL)
                ret = cpufreq_register_notifier(&cpufreq_notifier,
                        CPUFREQ_TRANSITION_NOTIFIER);

        return ret;
}

core_initcall(register_sched_cpufreq_notifier);
#endif /* CONFIG_HMP_FREQUENCY_INVARIANT_SCALE */

#ifdef CONFIG_HEVTASK_INTERFACE
/*
 *  * This allows printing both to /proc/task_detect and
 *   * to the console
 *    */
#ifndef CONFIG_KGDB_KDB
#define SEQ_printf(m, x...)                     \
        do {                                            \
                if (m)                                  \
                seq_printf(m, x);               \
                else                                    \
                printk(x);                      \
        } while (0)
#else
#define SEQ_printf(m, x...)                     \
        do {                                            \
                if (m)                                  \
                seq_printf(m, x);               \
                else if (__get_cpu_var(kdb_in_use) == 1)                \
                kdb_printf(x);                  \
                else                                            \
                printk(x);                              \
        } while (0)
#endif

static int task_detect_show(struct seq_file *m, void *v)
{
        struct task_struct *p;
        unsigned long flags;
        unsigned int i;

#ifdef CONFIG_HMP_FREQUENCY_INVARIANT_SCALE
        for(i=0;i<NR_CPUS;i++){
                SEQ_printf(m,"%5d ",freq_scale[i].curr_scale);
        }
#endif

        SEQ_printf(m, "\n%lu\n ",jiffies_to_cputime(jiffies));

        for(i=0;i<NR_CPUS;i++){         
                raw_spin_lock_irqsave(&cpu_rq(i)->lock,flags);     
                if(cpu_online(i)){
                        list_for_each_entry(p,&cpu_rq(i)->cfs_tasks,se.group_node){
                                SEQ_printf(m, "%lu %5d %5d %lu (%15s)\n ",
                                                p->se.avg.load_avg_ratio,p->pid,task_cpu(p),
                                                (p->utime+p->stime),p->comm);
                        }            
                }
                raw_spin_unlock_irqrestore(&cpu_rq(i)->lock,flags);

        }

        return 0;
}

static int task_detect_open(struct inode *inode, struct file *filp)
{
        return single_open(filp, task_detect_show, NULL);
}

static const struct file_operations task_detect_fops = {
        .open           = task_detect_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
};

static int __init init_task_detect_procfs(void)
{
        struct proc_dir_entry *pe;

        pe = proc_create("task_detect", 0444, NULL, &task_detect_fops);
        if (!pe)
                return -ENOMEM;
        return 0;
}

__initcall(init_task_detect_procfs);
#endif /* CONFIG_HEVTASK_INTERFACE */