+++ /dev/null
-/*
- * Copyright (C) 2015 Michael Turquette <mturquette@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/cpufreq.h>
-#include <linux/module.h>
-#include <linux/kthread.h>
-#include <linux/percpu.h>
-#include <linux/irq_work.h>
-#include <linux/delay.h>
-#include <linux/string.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/cpufreq_sched.h>
-
-#include "sched.h"
-
-#define THROTTLE_DOWN_NSEC 50000000 /* 50ms default */
-#define THROTTLE_UP_NSEC 500000 /* 500us default */
-
-struct static_key __read_mostly __sched_freq = STATIC_KEY_INIT_FALSE;
-static bool __read_mostly cpufreq_driver_slow;
-
-#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SCHED
-static struct cpufreq_governor cpufreq_gov_sched;
-#endif
-
-static DEFINE_PER_CPU(unsigned long, enabled);
-DEFINE_PER_CPU(struct sched_capacity_reqs, cpu_sched_capacity_reqs);
-
-struct gov_tunables {
- struct gov_attr_set attr_set;
- unsigned int up_throttle_nsec;
- unsigned int down_throttle_nsec;
-};
-
-/**
- * gov_data - per-policy data internal to the governor
- * @up_throttle: next throttling period expiry if increasing OPP
- * @down_throttle: next throttling period expiry if decreasing OPP
- * @up_throttle_nsec: throttle period length in nanoseconds if increasing OPP
- * @down_throttle_nsec: throttle period length in nanoseconds if decreasing OPP
- * @task: worker thread for dvfs transition that may block/sleep
- * @irq_work: callback used to wake up worker thread
- * @requested_freq: last frequency requested by the sched governor
- *
- * struct gov_data is the per-policy cpufreq_sched-specific data structure. A
- * per-policy instance of it is created when the cpufreq_sched governor receives
- * the CPUFREQ_GOV_START condition and a pointer to it exists in the gov_data
- * member of struct cpufreq_policy.
- *
- * Readers of this data must call down_read(policy->rwsem). Writers must
- * call down_write(policy->rwsem).
- */
-struct gov_data {
- ktime_t up_throttle;
- ktime_t down_throttle;
- struct gov_tunables *tunables;
- struct list_head tunables_hook;
- struct task_struct *task;
- struct irq_work irq_work;
- unsigned int requested_freq;
-};
-
-static void cpufreq_sched_try_driver_target(struct cpufreq_policy *policy,
- unsigned int freq)
-{
- struct gov_data *gd = policy->governor_data;
-
- /* avoid race with cpufreq_sched_stop */
- if (!down_write_trylock(&policy->rwsem))
- return;
-
- __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
-
- gd->up_throttle = ktime_add_ns(ktime_get(),
- gd->tunables->up_throttle_nsec);
- gd->down_throttle = ktime_add_ns(ktime_get(),
- gd->tunables->down_throttle_nsec);
- up_write(&policy->rwsem);
-}
-
-static bool finish_last_request(struct gov_data *gd, unsigned int cur_freq)
-{
- ktime_t now = ktime_get();
-
- ktime_t throttle = gd->requested_freq < cur_freq ?
- gd->down_throttle : gd->up_throttle;
-
- if (ktime_after(now, throttle))
- return false;
-
- while (1) {
- int usec_left = ktime_to_ns(ktime_sub(throttle, now));
-
- usec_left /= NSEC_PER_USEC;
- trace_cpufreq_sched_throttled(usec_left);
- usleep_range(usec_left, usec_left + 100);
- now = ktime_get();
- if (ktime_after(now, throttle))
- return true;
- }
-}
-
-/*
- * we pass in struct cpufreq_policy. This is safe because changing out the
- * policy requires a call to __cpufreq_governor(policy, CPUFREQ_GOV_STOP),
- * which tears down all of the data structures and __cpufreq_governor(policy,
- * CPUFREQ_GOV_START) will do a full rebuild, including this kthread with the
- * new policy pointer
- */
-static int cpufreq_sched_thread(void *data)
-{
- struct sched_param param;
- struct cpufreq_policy *policy;
- struct gov_data *gd;
- unsigned int new_request = 0;
- unsigned int last_request = 0;
- int ret;
-
- policy = (struct cpufreq_policy *) data;
- gd = policy->governor_data;
-
- param.sched_priority = 50;
- ret = sched_setscheduler_nocheck(gd->task, SCHED_FIFO, ¶m);
- if (ret) {
- pr_warn("%s: failed to set SCHED_FIFO\n", __func__);
- do_exit(-EINVAL);
- } else {
- pr_debug("%s: kthread (%d) set to SCHED_FIFO\n",
- __func__, gd->task->pid);
- }
-
- do {
- new_request = gd->requested_freq;
- if (new_request == last_request) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (kthread_should_stop())
- break;
- schedule();
- } else {
- /*
- * if the frequency thread sleeps while waiting to be
- * unthrottled, start over to check for a newer request
- */
- if (finish_last_request(gd, policy->cur))
- continue;
- last_request = new_request;
- cpufreq_sched_try_driver_target(policy, new_request);
- }
- } while (!kthread_should_stop());
-
- return 0;
-}
-
-static void cpufreq_sched_irq_work(struct irq_work *irq_work)
-{
- struct gov_data *gd;
-
- gd = container_of(irq_work, struct gov_data, irq_work);
- if (!gd)
- return;
-
- wake_up_process(gd->task);
-}
-
-static void update_fdomain_capacity_request(int cpu)
-{
- unsigned int freq_new, index_new, cpu_tmp;
- struct cpufreq_policy *policy;
- struct gov_data *gd;
- unsigned long capacity = 0;
-
- /*
- * Avoid grabbing the policy if possible. A test is still
- * required after locking the CPU's policy to avoid racing
- * with the governor changing.
- */
- if (!per_cpu(enabled, cpu))
- return;
-
- policy = cpufreq_cpu_get(cpu);
- if (IS_ERR_OR_NULL(policy))
- return;
-
- if (policy->governor != &cpufreq_gov_sched ||
- !policy->governor_data)
- goto out;
-
- gd = policy->governor_data;
-
- /* find max capacity requested by cpus in this policy */
- for_each_cpu(cpu_tmp, policy->cpus) {
- struct sched_capacity_reqs *scr;
-
- scr = &per_cpu(cpu_sched_capacity_reqs, cpu_tmp);
- capacity = max(capacity, scr->total);
- }
-
- /* Convert the new maximum capacity request into a cpu frequency */
- freq_new = capacity * policy->cpuinfo.max_freq >> SCHED_CAPACITY_SHIFT;
- if (cpufreq_frequency_table_target(policy, policy->freq_table,
- freq_new, CPUFREQ_RELATION_L,
- &index_new))
- goto out;
- freq_new = policy->freq_table[index_new].frequency;
-
- if (freq_new > policy->max)
- freq_new = policy->max;
-
- if (freq_new < policy->min)
- freq_new = policy->min;
-
- trace_cpufreq_sched_request_opp(cpu, capacity, freq_new,
- gd->requested_freq);
- if (freq_new == gd->requested_freq)
- goto out;
-
- gd->requested_freq = freq_new;
-
- /*
- * Throttling is not yet supported on platforms with fast cpufreq
- * drivers.
- */
- if (cpufreq_driver_slow)
- irq_work_queue_on(&gd->irq_work, cpu);
- else
- cpufreq_sched_try_driver_target(policy, freq_new);
-
-out:
- cpufreq_cpu_put(policy);
-}
-
-#ifdef CONFIG_SCHED_WALT
-static inline unsigned long
-requested_capacity(struct sched_capacity_reqs *scr)
-{
- if (!walt_disabled && sysctl_sched_use_walt_cpu_util)
- return scr->cfs;
- return scr->cfs + scr->rt;
-}
-#else
-#define requested_capacity(scr) (scr->cfs + scr->rt)
-#endif
-
-void update_cpu_capacity_request(int cpu, bool request)
-{
- unsigned long new_capacity;
- struct sched_capacity_reqs *scr;
-
- /* The rq lock serializes access to the CPU's sched_capacity_reqs. */
- lockdep_assert_held(&cpu_rq(cpu)->lock);
-
- scr = &per_cpu(cpu_sched_capacity_reqs, cpu);
-
- new_capacity = requested_capacity(scr);
- new_capacity = new_capacity * capacity_margin
- / SCHED_CAPACITY_SCALE;
- new_capacity += scr->dl;
-
- if (new_capacity == scr->total)
- return;
-
- trace_cpufreq_sched_update_capacity(cpu, request, scr, new_capacity);
-
- scr->total = new_capacity;
- if (request)
- update_fdomain_capacity_request(cpu);
-}
-
-static inline void set_sched_freq(void)
-{
- static_key_slow_inc(&__sched_freq);
-}
-
-static inline void clear_sched_freq(void)
-{
- static_key_slow_dec(&__sched_freq);
-}
-
-/* Tunables */
-static struct gov_tunables *global_tunables;
-
-static inline struct gov_tunables *to_tunables(struct gov_attr_set *attr_set)
-{
- return container_of(attr_set, struct gov_tunables, attr_set);
-}
-
-static ssize_t up_throttle_nsec_show(struct gov_attr_set *attr_set, char *buf)
-{
- struct gov_tunables *tunables = to_tunables(attr_set);
-
- return sprintf(buf, "%u\n", tunables->up_throttle_nsec);
-}
-
-static ssize_t up_throttle_nsec_store(struct gov_attr_set *attr_set,
- const char *buf, size_t count)
-{
- struct gov_tunables *tunables = to_tunables(attr_set);
- int ret;
- long unsigned int val;
-
- ret = kstrtoul(buf, 0, &val);
- if (ret < 0)
- return ret;
- tunables->up_throttle_nsec = val;
- return count;
-}
-
-static ssize_t down_throttle_nsec_show(struct gov_attr_set *attr_set, char *buf)
-{
- struct gov_tunables *tunables = to_tunables(attr_set);
-
- return sprintf(buf, "%u\n", tunables->down_throttle_nsec);
-}
-
-static ssize_t down_throttle_nsec_store(struct gov_attr_set *attr_set,
- const char *buf, size_t count)
-{
- struct gov_tunables *tunables = to_tunables(attr_set);
- int ret;
- long unsigned int val;
-
- ret = kstrtoul(buf, 0, &val);
- if (ret < 0)
- return ret;
- tunables->down_throttle_nsec = val;
- return count;
-}
-
-static struct governor_attr up_throttle_nsec = __ATTR_RW(up_throttle_nsec);
-static struct governor_attr down_throttle_nsec = __ATTR_RW(down_throttle_nsec);
-
-static struct attribute *schedfreq_attributes[] = {
- &up_throttle_nsec.attr,
- &down_throttle_nsec.attr,
- NULL
-};
-
-static struct kobj_type tunables_ktype = {
- .default_attrs = schedfreq_attributes,
- .sysfs_ops = &governor_sysfs_ops,
-};
-
-static int cpufreq_sched_policy_init(struct cpufreq_policy *policy)
-{
- struct gov_data *gd;
- int cpu;
- int rc;
-
- for_each_cpu(cpu, policy->cpus)
- memset(&per_cpu(cpu_sched_capacity_reqs, cpu), 0,
- sizeof(struct sched_capacity_reqs));
-
- gd = kzalloc(sizeof(*gd), GFP_KERNEL);
- if (!gd)
- return -ENOMEM;
-
- policy->governor_data = gd;
-
- if (!global_tunables) {
- gd->tunables = kzalloc(sizeof(*gd->tunables), GFP_KERNEL);
- if (!gd->tunables)
- goto free_gd;
-
- gd->tunables->up_throttle_nsec =
- policy->cpuinfo.transition_latency ?
- policy->cpuinfo.transition_latency :
- THROTTLE_UP_NSEC;
- gd->tunables->down_throttle_nsec =
- THROTTLE_DOWN_NSEC;
-
- rc = kobject_init_and_add(&gd->tunables->attr_set.kobj,
- &tunables_ktype,
- get_governor_parent_kobj(policy),
- "%s", cpufreq_gov_sched.name);
- if (rc)
- goto free_tunables;
-
- gov_attr_set_init(&gd->tunables->attr_set,
- &gd->tunables_hook);
-
- pr_debug("%s: throttle_threshold = %u [ns]\n",
- __func__, gd->tunables->up_throttle_nsec);
-
- if (!have_governor_per_policy())
- global_tunables = gd->tunables;
- } else {
- gd->tunables = global_tunables;
- gov_attr_set_get(&global_tunables->attr_set,
- &gd->tunables_hook);
- }
-
- policy->governor_data = gd;
- if (cpufreq_driver_is_slow()) {
- cpufreq_driver_slow = true;
- gd->task = kthread_create(cpufreq_sched_thread, policy,
- "kschedfreq:%d",
- cpumask_first(policy->related_cpus));
- if (IS_ERR_OR_NULL(gd->task)) {
- pr_err("%s: failed to create kschedfreq thread\n",
- __func__);
- goto free_tunables;
- }
- get_task_struct(gd->task);
- kthread_bind_mask(gd->task, policy->related_cpus);
- wake_up_process(gd->task);
- init_irq_work(&gd->irq_work, cpufreq_sched_irq_work);
- }
-
- set_sched_freq();
-
- return 0;
-
-free_tunables:
- kfree(gd->tunables);
-free_gd:
- policy->governor_data = NULL;
- kfree(gd);
- return -ENOMEM;
-}
-
-static int cpufreq_sched_policy_exit(struct cpufreq_policy *policy)
-{
- unsigned int count;
- struct gov_data *gd = policy->governor_data;
-
- clear_sched_freq();
- if (cpufreq_driver_slow) {
- kthread_stop(gd->task);
- put_task_struct(gd->task);
- }
-
- count = gov_attr_set_put(&gd->tunables->attr_set, &gd->tunables_hook);
- if (!count) {
- if (!have_governor_per_policy())
- global_tunables = NULL;
- kfree(gd->tunables);
- }
-
- policy->governor_data = NULL;
-
- kfree(gd);
- return 0;
-}
-
-static int cpufreq_sched_start(struct cpufreq_policy *policy)
-{
- int cpu;
-
- for_each_cpu(cpu, policy->cpus)
- per_cpu(enabled, cpu) = 1;
-
- return 0;
-}
-
-static void cpufreq_sched_limits(struct cpufreq_policy *policy)
-{
- unsigned int clamp_freq;
- struct gov_data *gd = policy->governor_data;;
-
- pr_debug("limit event for cpu %u: %u - %u kHz, currently %u kHz\n",
- policy->cpu, policy->min, policy->max,
- policy->cur);
-
- clamp_freq = clamp(gd->requested_freq, policy->min, policy->max);
-
- if (policy->cur != clamp_freq)
- __cpufreq_driver_target(policy, clamp_freq, CPUFREQ_RELATION_L);
-}
-
-static int cpufreq_sched_stop(struct cpufreq_policy *policy)
-{
- int cpu;
-
- for_each_cpu(cpu, policy->cpus)
- per_cpu(enabled, cpu) = 0;
-
- return 0;
-}
-
-static int cpufreq_sched_setup(struct cpufreq_policy *policy,
- unsigned int event)
-{
- switch (event) {
- case CPUFREQ_GOV_POLICY_INIT:
- return cpufreq_sched_policy_init(policy);
- case CPUFREQ_GOV_POLICY_EXIT:
- return cpufreq_sched_policy_exit(policy);
- case CPUFREQ_GOV_START:
- return cpufreq_sched_start(policy);
- case CPUFREQ_GOV_STOP:
- return cpufreq_sched_stop(policy);
- case CPUFREQ_GOV_LIMITS:
- cpufreq_sched_limits(policy);
- break;
- }
- return 0;
-}
-
-
-#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SCHED
-static
-#endif
-struct cpufreq_governor cpufreq_gov_sched = {
- .name = "sched",
- .governor = cpufreq_sched_setup,
- .owner = THIS_MODULE,
-};
-
-static int __init cpufreq_sched_init(void)
-{
- int cpu;
-
- for_each_cpu(cpu, cpu_possible_mask)
- per_cpu(enabled, cpu) = 0;
- return cpufreq_register_governor(&cpufreq_gov_sched);
-}
-
-/* Try to make this the default governor */
-fs_initcall(cpufreq_sched_init);
unsigned int normalized_sysctl_sched_latency = 6000000ULL;
unsigned int sysctl_sched_sync_hint_enable = 1;
-unsigned int sysctl_sched_initial_task_util = 0;
unsigned int sysctl_sched_cstate_aware = 1;
#ifdef CONFIG_SCHED_WALT
sa->load_sum = sa->load_avg * LOAD_AVG_MAX;
/*
* In previous Android versions, we used to have:
- * sa->util_avg = sched_freq() ?
- * sysctl_sched_initial_task_util :
- * scale_load_down(SCHED_LOAD_SCALE);
+ * sa->util_avg = scale_load_down(SCHED_LOAD_SCALE);
* sa->util_sum = sa->util_avg * LOAD_AVG_MAX;
* However, that functionality has been moved to enqueue.
* It is unclear if we should restore this in enqueue.
#define boosted_cpu_util(cpu) cpu_util_freq(cpu)
#endif
-#ifdef CONFIG_SMP
-static void update_capacity_of(int cpu)
-{
- unsigned long req_cap;
-
- if (!sched_freq())
- return;
-
- /* Normalize scale-invariant capacity to cpu. */
- req_cap = boosted_cpu_util(cpu);
- req_cap = req_cap * SCHED_CAPACITY_SCALE / capacity_orig_of(cpu);
- set_cfs_cpu_capacity(cpu, true, req_cap);
-}
-#endif
-
/*
* The enqueue_task method is called before nr_running is
* increased. Here we update the fair scheduling stats and
struct sched_entity *se = &p->se;
#ifdef CONFIG_SMP
int task_new = flags & ENQUEUE_WAKEUP_NEW;
- int task_wakeup = flags & ENQUEUE_WAKEUP;
#endif
/*
rq->rd->overutilized = true;
trace_sched_overutilized(true);
}
-
- /*
- * We want to potentially trigger a freq switch
- * request only for tasks that are waking up; this is
- * because we get here also during load balancing, but
- * in these cases it seems wise to trigger as single
- * request after load balancing is done.
- */
- if (task_new || task_wakeup)
- update_capacity_of(cpu_of(rq));
}
#endif /* CONFIG_SMP */
*/
schedtune_dequeue_task(p, cpu_of(rq));
- if (!se) {
+ if (!se)
walt_dec_cumulative_runnable_avg(rq, p);
-
- /*
- * We want to potentially trigger a freq switch
- * request only for tasks that are going to sleep;
- * this is because we get here also during load
- * balancing, but in these cases it seems wise to
- * trigger as single request after load balancing is
- * done.
- */
- if (task_sleep) {
- if (rq->cfs.nr_running)
- update_capacity_of(cpu_of(rq));
- else if (sched_freq())
- set_cfs_cpu_capacity(cpu_of(rq), false, 0); /* no normalization required for 0 */
- }
- }
-
#endif /* CONFIG_SMP */
hrtick_update(rq);
{
raw_spin_lock(&rq->lock);
attach_task(rq, p);
- /*
- * We want to potentially raise target_cpu's OPP.
- */
- update_capacity_of(cpu_of(rq));
raw_spin_unlock(&rq->lock);
}
attach_task(env->dst_rq, p);
}
- /*
- * We want to potentially raise env.dst_cpu's OPP.
- */
- update_capacity_of(env->dst_cpu);
-
raw_spin_unlock(&env->dst_rq->lock);
}
* ld_moved - cumulative load moved across iterations
*/
cur_ld_moved = detach_tasks(&env);
- /*
- * We want to potentially lower env.src_cpu's OPP.
- */
- if (cur_ld_moved)
- update_capacity_of(env.src_cpu);
/*
* We've detached some tasks from busiest_rq. Every
struct sched_domain *sd;
int pulled_task = 0;
u64 curr_cost = 0;
- long removed_util=0;
idle_enter_fair(this_rq);
raw_spin_unlock(&this_rq->lock);
- /*
- * If removed_util_avg is !0 we most probably migrated some task away
- * from this_cpu. In this case we might be willing to trigger an OPP
- * update, but we want to do so if we don't find anybody else to pull
- * here (we will trigger an OPP update with the pulled task's enqueue
- * anyway).
- *
- * Record removed_util before calling update_blocked_averages, and use
- * it below (before returning) to see if an OPP update is required.
- */
- removed_util = atomic_long_read(&(this_rq->cfs).removed_util_avg);
update_blocked_averages(this_cpu);
rcu_read_lock();
for_each_domain(this_cpu, sd) {
if (pulled_task) {
idle_exit_fair(this_rq);
this_rq->idle_stamp = 0;
- } else if (removed_util) {
- /*
- * No task pulled and someone has been migrated away.
- * Good case to trigger an OPP update.
- */
- update_capacity_of(this_cpu);
}
return pulled_task;
update_rq_clock(busiest_rq);
p = detach_one_task(&env);
- if (p) {
+ if (p)
schedstat_inc(sd, alb_pushed);
- /*
- * We want to potentially lower env.src_cpu's OPP.
- */
- update_capacity_of(env.src_cpu);
- }
else
schedstat_inc(sd, alb_failed);
}
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff