From c365c292d05908c6ea6f32708f331e21033fe71d Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 7 Feb 2014 20:58:42 +0100 Subject: [PATCH] sched: Consider pi boosting in setscheduler() If a PI boosted task policy/priority is modified by a setscheduler() call we unconditionally dequeue and requeue the task if it is on the runqueue even if the new priority is lower than the current effective boosted priority. This can result in undesired reordering of the priority bucket list. If the new priority is less or equal than the current effective we just store the new parameters in the task struct and leave the scheduler class and the runqueue untouched. This is handled when the task deboosts itself. Only if the new priority is higher than the effective boosted priority we apply the change immediately. Signed-off-by: Thomas Gleixner [ Rebase ontop of v3.14-rc1. ] Signed-off-by: Sebastian Andrzej Siewior Cc: Dario Faggioli Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1391803122-4425-7-git-send-email-bigeasy@linutronix.de Signed-off-by: Ingo Molnar --- include/linux/sched/rt.h | 7 +++++++ kernel/locking/rtmutex.c | 12 ++++++++++++ kernel/sched/core.c | 41 +++++++++++++++++++++++++++++----------- 3 files changed, 49 insertions(+), 11 deletions(-) diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h index f7453d4c5613..6341f5be6e24 100644 --- a/include/linux/sched/rt.h +++ b/include/linux/sched/rt.h @@ -18,6 +18,7 @@ static inline int rt_task(struct task_struct *p) #ifdef CONFIG_RT_MUTEXES extern int rt_mutex_getprio(struct task_struct *p); extern void rt_mutex_setprio(struct task_struct *p, int prio); +extern int rt_mutex_check_prio(struct task_struct *task, int newprio); extern struct task_struct *rt_mutex_get_top_task(struct task_struct *task); extern void rt_mutex_adjust_pi(struct task_struct *p); static inline bool tsk_is_pi_blocked(struct task_struct *tsk) @@ -29,6 +30,12 @@ static inline int rt_mutex_getprio(struct task_struct *p) { return p->normal_prio; } + +static inline int rt_mutex_check_prio(struct task_struct *task, int newprio) +{ + return 0; +} + static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task) { return NULL; diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 2e960a2bab81..aa4dff04b594 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -212,6 +212,18 @@ struct task_struct *rt_mutex_get_top_task(struct task_struct *task) return task_top_pi_waiter(task)->task; } +/* + * Called by sched_setscheduler() to check whether the priority change + * is overruled by a possible priority boosting. + */ +int rt_mutex_check_prio(struct task_struct *task, int newprio) +{ + if (!task_has_pi_waiters(task)) + return 0; + + return task_top_pi_waiter(task)->task->prio <= newprio; +} + /* * Adjust the priority of a task, after its pi_waiters got modified. * diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 9c2fcbf9a266..003263b3b05c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2902,7 +2902,8 @@ EXPORT_SYMBOL(sleep_on_timeout); * This function changes the 'effective' priority of a task. It does * not touch ->normal_prio like __setscheduler(). * - * Used by the rt_mutex code to implement priority inheritance logic. + * Used by the rt_mutex code to implement priority inheritance + * logic. Call site only calls if the priority of the task changed. */ void rt_mutex_setprio(struct task_struct *p, int prio) { @@ -3171,9 +3172,8 @@ __setparam_dl(struct task_struct *p, const struct sched_attr *attr) dl_se->dl_new = 1; } -/* Actually do priority change: must hold pi & rq lock. */ -static void __setscheduler(struct rq *rq, struct task_struct *p, - const struct sched_attr *attr) +static void __setscheduler_params(struct task_struct *p, + const struct sched_attr *attr) { int policy = attr->sched_policy; @@ -3193,9 +3193,14 @@ static void __setscheduler(struct rq *rq, struct task_struct *p, * getparam()/getattr() don't report silly values for !rt tasks. */ p->rt_priority = attr->sched_priority; + set_load_weight(p); +} - p->normal_prio = normal_prio(p); - p->prio = rt_mutex_getprio(p); +/* Actually do priority change: must hold pi & rq lock. */ +static void __setscheduler(struct rq *rq, struct task_struct *p, + const struct sched_attr *attr) +{ + __setscheduler_params(p, attr); if (dl_prio(p->prio)) p->sched_class = &dl_sched_class; @@ -3203,8 +3208,6 @@ static void __setscheduler(struct rq *rq, struct task_struct *p, p->sched_class = &rt_sched_class; else p->sched_class = &fair_sched_class; - - set_load_weight(p); } static void @@ -3257,6 +3260,7 @@ static int __sched_setscheduler(struct task_struct *p, const struct sched_attr *attr, bool user) { + int newprio = MAX_RT_PRIO - 1 - attr->sched_priority; int retval, oldprio, oldpolicy = -1, on_rq, running; int policy = attr->sched_policy; unsigned long flags; @@ -3427,6 +3431,24 @@ change: return -EBUSY; } + p->sched_reset_on_fork = reset_on_fork; + oldprio = p->prio; + + /* + * Special case for priority boosted tasks. + * + * If the new priority is lower or equal (user space view) + * than the current (boosted) priority, we just store the new + * normal parameters and do not touch the scheduler class and + * the runqueue. This will be done when the task deboost + * itself. + */ + if (rt_mutex_check_prio(p, newprio)) { + __setscheduler_params(p, attr); + task_rq_unlock(rq, p, &flags); + return 0; + } + on_rq = p->on_rq; running = task_current(rq, p); if (on_rq) @@ -3434,9 +3456,6 @@ change: if (running) p->sched_class->put_prev_task(rq, p); - p->sched_reset_on_fork = reset_on_fork; - - oldprio = p->prio; prev_class = p->sched_class; __setscheduler(rq, p, attr); -- 2.20.1