From a05e8c51ff097ff73ec2947631d9102283545f7c Mon Sep 17 00:00:00 2001 From: Byungchul Park Date: Thu, 20 Aug 2015 20:21:56 +0900 Subject: [PATCH] sched/fair: Factor out the {at,de}taching of the per entity load {to,from} the runqueue Currently we open-code the addition/subtraction of the per entity load to/from the runqueue, factor this out into helper functions. Signed-off-by: Byungchul Park [ Rewrote the changelog. ] Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: yuyang.du@intel.com Link: http://lkml.kernel.org/r/1440069720-27038-2-git-send-email-byungchul.park@lge.com Signed-off-by: Ingo Molnar --- kernel/sched/fair.c | 77 ++++++++++++++++++++++----------------------- 1 file changed, 38 insertions(+), 39 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e2e3483b1ec..a72a71b501de 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2664,8 +2664,8 @@ static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq); /* Group cfs_rq's load_avg is used for task_h_load and update_cfs_share */ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq) { - int decayed; struct sched_avg *sa = &cfs_rq->avg; + int decayed; if (atomic_long_read(&cfs_rq->removed_load_avg)) { long r = atomic_long_xchg(&cfs_rq->removed_load_avg, 0); @@ -2695,33 +2695,52 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq) static inline void update_load_avg(struct sched_entity *se, int update_tg) { struct cfs_rq *cfs_rq = cfs_rq_of(se); - int cpu = cpu_of(rq_of(cfs_rq)); u64 now = cfs_rq_clock_task(cfs_rq); + int cpu = cpu_of(rq_of(cfs_rq)); /* * Track task load average for carrying it to new CPU after migrated, and * track group sched_entity load average for task_h_load calc in migration */ __update_load_avg(now, cpu, &se->avg, - se->on_rq * scale_load_down(se->load.weight), cfs_rq->curr == se, NULL); + se->on_rq * scale_load_down(se->load.weight), + cfs_rq->curr == se, NULL); if (update_cfs_rq_load_avg(now, cfs_rq) && update_tg) update_tg_load_avg(cfs_rq, 0); } +static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) +{ + se->avg.last_update_time = cfs_rq->avg.last_update_time; + cfs_rq->avg.load_avg += se->avg.load_avg; + cfs_rq->avg.load_sum += se->avg.load_sum; + cfs_rq->avg.util_avg += se->avg.util_avg; + cfs_rq->avg.util_sum += se->avg.util_sum; +} + +static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) +{ + __update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)), + &se->avg, se->on_rq * scale_load_down(se->load.weight), + cfs_rq->curr == se, NULL); + + cfs_rq->avg.load_avg = max_t(long, cfs_rq->avg.load_avg - se->avg.load_avg, 0); + cfs_rq->avg.load_sum = max_t(s64, cfs_rq->avg.load_sum - se->avg.load_sum, 0); + cfs_rq->avg.util_avg = max_t(long, cfs_rq->avg.util_avg - se->avg.util_avg, 0); + cfs_rq->avg.util_sum = max_t(s32, cfs_rq->avg.util_sum - se->avg.util_sum, 0); +} + /* Add the load generated by se into cfs_rq's load average */ static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { struct sched_avg *sa = &se->avg; u64 now = cfs_rq_clock_task(cfs_rq); - int migrated = 0, decayed; + int migrated, decayed; - if (sa->last_update_time == 0) { - sa->last_update_time = now; - migrated = 1; - } - else { + migrated = !sa->last_update_time; + if (!migrated) { __update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa, se->on_rq * scale_load_down(se->load.weight), cfs_rq->curr == se, NULL); @@ -2732,12 +2751,8 @@ enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) cfs_rq->runnable_load_avg += sa->load_avg; cfs_rq->runnable_load_sum += sa->load_sum; - if (migrated) { - cfs_rq->avg.load_avg += sa->load_avg; - cfs_rq->avg.load_sum += sa->load_sum; - cfs_rq->avg.util_avg += sa->util_avg; - cfs_rq->avg.util_sum += sa->util_sum; - } + if (migrated) + attach_entity_load_avg(cfs_rq, se); if (decayed || migrated) update_tg_load_avg(cfs_rq, 0); @@ -2752,7 +2767,7 @@ dequeue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) cfs_rq->runnable_load_avg = max_t(long, cfs_rq->runnable_load_avg - se->avg.load_avg, 0); cfs_rq->runnable_load_sum = - max_t(s64, cfs_rq->runnable_load_sum - se->avg.load_sum, 0); + max_t(s64, cfs_rq->runnable_load_sum - se->avg.load_sum, 0); } /* @@ -2820,6 +2835,11 @@ static inline void dequeue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {} static inline void remove_entity_load_avg(struct sched_entity *se) {} +static inline void +attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {} +static inline void +detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {} + static inline int idle_balance(struct rq *rq) { return 0; @@ -7909,25 +7929,10 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p) se->vruntime -= cfs_rq->min_vruntime; } -#ifdef CONFIG_SMP /* Catch up with the cfs_rq and remove our load when we leave */ - __update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq), &se->avg, - se->on_rq * scale_load_down(se->load.weight), cfs_rq->curr == se, NULL); - - cfs_rq->avg.load_avg = - max_t(long, cfs_rq->avg.load_avg - se->avg.load_avg, 0); - cfs_rq->avg.load_sum = - max_t(s64, cfs_rq->avg.load_sum - se->avg.load_sum, 0); - cfs_rq->avg.util_avg = - max_t(long, cfs_rq->avg.util_avg - se->avg.util_avg, 0); - cfs_rq->avg.util_sum = - max_t(s32, cfs_rq->avg.util_sum - se->avg.util_sum, 0); -#endif + detach_entity_load_avg(cfs_rq, se); } -/* - * We switched to the sched_fair class. - */ static void switched_to_fair(struct rq *rq, struct task_struct *p) { struct sched_entity *se = &p->se; @@ -8040,14 +8045,8 @@ static void task_move_group_fair(struct task_struct *p, int queued) cfs_rq = cfs_rq_of(se); se->vruntime += cfs_rq->min_vruntime; -#ifdef CONFIG_SMP /* Virtually synchronize task with its new cfs_rq */ - p->se.avg.last_update_time = cfs_rq->avg.last_update_time; - cfs_rq->avg.load_avg += p->se.avg.load_avg; - cfs_rq->avg.load_sum += p->se.avg.load_sum; - cfs_rq->avg.util_avg += p->se.avg.util_avg; - cfs_rq->avg.util_sum += p->se.avg.util_sum; -#endif + attach_entity_load_avg(cfs_rq, se); } }