sched/fair: Factorize PELT update
Every time we modify load/utilization of sched_entity, we start to sync it with its cfs_rq. This update is done in different ways: - when attaching/detaching a sched_entity, we update cfs_rq and then we sync the entity with the cfs_rq. - when enqueueing/dequeuing the sched_entity, we update both sched_entity and cfs_rq metrics to now. Use update_load_avg() everytime we have to update and sync cfs_rq and sched_entity before changing the state of a sched_enity. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Morten.Rasmussen@arm.com Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bsegall@google.com Cc: kernellwp@gmail.com Cc: pjt@google.com Cc: yuyang.du@intel.com Link: http://lkml.kernel.org/r/1478598827-32372-4-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -3092,8 +3092,14 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
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return decayed || removed_load;
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}
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/*
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* Optional action to be done while updating the load average
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*/
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#define UPDATE_TG 0x1
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#define SKIP_AGE_LOAD 0x2
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/* Update task and its cfs_rq load average */
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static inline void update_load_avg(struct sched_entity *se, int update_tg)
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static inline void update_load_avg(struct sched_entity *se, int flags)
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{
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struct cfs_rq *cfs_rq = cfs_rq_of(se);
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u64 now = cfs_rq_clock_task(cfs_rq);
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@ -3104,11 +3110,13 @@ static inline void update_load_avg(struct sched_entity *se, int update_tg)
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* Track task load average for carrying it to new CPU after migrated, and
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* track group sched_entity load average for task_h_load calc in migration
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*/
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if (se->avg.last_update_time && !(flags & SKIP_AGE_LOAD)) {
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__update_load_avg(now, cpu, &se->avg,
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se->on_rq * scale_load_down(se->load.weight),
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cfs_rq->curr == se, NULL);
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}
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if (update_cfs_rq_load_avg(now, cfs_rq, true) && update_tg)
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if (update_cfs_rq_load_avg(now, cfs_rq, true) && (flags & UPDATE_TG))
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update_tg_load_avg(cfs_rq, 0);
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}
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@ -3122,26 +3130,6 @@ static inline void update_load_avg(struct sched_entity *se, int update_tg)
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*/
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static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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if (!sched_feat(ATTACH_AGE_LOAD))
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goto skip_aging;
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/*
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* If we got migrated (either between CPUs or between cgroups) we'll
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* have aged the average right before clearing @last_update_time.
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*
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* Or we're fresh through post_init_entity_util_avg().
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*/
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if (se->avg.last_update_time) {
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__update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
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&se->avg, 0, 0, NULL);
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/*
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* XXX: we could have just aged the entire load away if we've been
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* absent from the fair class for too long.
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*/
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}
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skip_aging:
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se->avg.last_update_time = cfs_rq->avg.last_update_time;
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cfs_rq->avg.load_avg += se->avg.load_avg;
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cfs_rq->avg.load_sum += se->avg.load_sum;
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@ -3161,9 +3149,6 @@ skip_aging:
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*/
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static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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__update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
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&se->avg, se->on_rq * scale_load_down(se->load.weight),
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cfs_rq->curr == se, NULL);
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sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
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sub_positive(&cfs_rq->avg.load_sum, se->avg.load_sum);
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@ -3178,34 +3163,20 @@ static inline void
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enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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struct sched_avg *sa = &se->avg;
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u64 now = cfs_rq_clock_task(cfs_rq);
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int migrated, decayed;
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migrated = !sa->last_update_time;
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if (!migrated) {
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__update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa,
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se->on_rq * scale_load_down(se->load.weight),
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cfs_rq->curr == se, NULL);
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}
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decayed = update_cfs_rq_load_avg(now, cfs_rq, !migrated);
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cfs_rq->runnable_load_avg += sa->load_avg;
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cfs_rq->runnable_load_sum += sa->load_sum;
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if (migrated)
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if (!sa->last_update_time) {
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attach_entity_load_avg(cfs_rq, se);
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if (decayed || migrated)
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update_tg_load_avg(cfs_rq, 0);
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}
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}
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/* Remove the runnable load generated by se from cfs_rq's runnable load average */
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static inline void
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dequeue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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update_load_avg(se, 1);
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cfs_rq->runnable_load_avg =
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max_t(long, cfs_rq->runnable_load_avg - se->avg.load_avg, 0);
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cfs_rq->runnable_load_sum =
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@ -3289,7 +3260,10 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
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return 0;
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}
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static inline void update_load_avg(struct sched_entity *se, int not_used)
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#define UPDATE_TG 0x0
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#define SKIP_AGE_LOAD 0x0
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static inline void update_load_avg(struct sched_entity *se, int not_used1)
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{
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cpufreq_update_util(rq_of(cfs_rq_of(se)), 0);
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}
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@ -3434,6 +3408,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
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if (renorm && !curr)
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se->vruntime += cfs_rq->min_vruntime;
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update_load_avg(se, UPDATE_TG);
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enqueue_entity_load_avg(cfs_rq, se);
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account_entity_enqueue(cfs_rq, se);
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update_cfs_shares(cfs_rq);
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@ -3508,6 +3483,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
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* Update run-time statistics of the 'current'.
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*/
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update_curr(cfs_rq);
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update_load_avg(se, UPDATE_TG);
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dequeue_entity_load_avg(cfs_rq, se);
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update_stats_dequeue(cfs_rq, se, flags);
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@ -3595,7 +3571,7 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
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*/
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update_stats_wait_end(cfs_rq, se);
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__dequeue_entity(cfs_rq, se);
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update_load_avg(se, 1);
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update_load_avg(se, UPDATE_TG);
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}
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update_stats_curr_start(cfs_rq, se);
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@ -3713,7 +3689,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
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/*
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* Ensure that runnable average is periodically updated.
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*/
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update_load_avg(curr, 1);
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update_load_avg(curr, UPDATE_TG);
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update_cfs_shares(cfs_rq);
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#ifdef CONFIG_SCHED_HRTICK
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@ -4610,7 +4586,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
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if (cfs_rq_throttled(cfs_rq))
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break;
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update_load_avg(se, 1);
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update_load_avg(se, UPDATE_TG);
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update_cfs_shares(cfs_rq);
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}
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@ -4669,7 +4645,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
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if (cfs_rq_throttled(cfs_rq))
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break;
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update_load_avg(se, 1);
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update_load_avg(se, UPDATE_TG);
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update_cfs_shares(cfs_rq);
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}
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@ -8821,10 +8797,9 @@ static inline bool vruntime_normalized(struct task_struct *p)
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static void detach_entity_cfs_rq(struct sched_entity *se)
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{
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struct cfs_rq *cfs_rq = cfs_rq_of(se);
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u64 now = cfs_rq_clock_task(cfs_rq);
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/* Catch up with the cfs_rq and remove our load when we leave */
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update_cfs_rq_load_avg(now, cfs_rq, false);
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update_load_avg(se, 0);
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detach_entity_load_avg(cfs_rq, se);
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update_tg_load_avg(cfs_rq, false);
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}
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@ -8832,7 +8807,6 @@ static void detach_entity_cfs_rq(struct sched_entity *se)
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static void attach_entity_cfs_rq(struct sched_entity *se)
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{
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struct cfs_rq *cfs_rq = cfs_rq_of(se);
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u64 now = cfs_rq_clock_task(cfs_rq);
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#ifdef CONFIG_FAIR_GROUP_SCHED
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/*
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#endif
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/* Synchronize entity with its cfs_rq */
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update_cfs_rq_load_avg(now, cfs_rq, false);
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update_load_avg(se, sched_feat(ATTACH_AGE_LOAD) ? 0 : SKIP_AGE_LOAD);
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attach_entity_load_avg(cfs_rq, se);
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update_tg_load_avg(cfs_rq, false);
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}
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