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sched: Update_cfs_shares at period edge

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Now that our measurement intervals are small (~1ms) we can amortize the posting
of update_shares() to be about each period overflow.  This is a large cost
saving for frequently switching tasks.

Signed-off-by: Paul Turner <pjt@google.com>
Reviewed-by: Ben Segall <bsegall@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120823141507.200772172@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Paul Turner 2012-10-04 13:18:31 +02:00 committed by Ingo Molnar
parent 48a1675323
commit f269ae0469
1 changed files with 10 additions and 8 deletions
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18
kernel/sched/fair.c
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@ -1187,6 +1187,7 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
}
__update_cfs_rq_tg_load_contrib(cfs_rq, force_update);
update_cfs_shares(cfs_rq);
}
static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
@ -1396,9 +1397,8 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
* 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);
enqueue_entity_load_avg(cfs_rq, se, flags & ENQUEUE_WAKEUP);
if (flags & ENQUEUE_WAKEUP) {
place_entity(cfs_rq, se, 0);
@ -1471,7 +1471,6 @@ 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) {
@ -1491,8 +1490,8 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
if (se != cfs_rq->curr)
__dequeue_entity(cfs_rq, se);
se->on_rq = 0;
account_entity_dequeue(cfs_rq, se);
dequeue_entity_load_avg(cfs_rq, se, flags & DEQUEUE_SLEEP);
/*
* Normalize the entity after updating the min_vruntime because the
@ -1506,7 +1505,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
return_cfs_rq_runtime(cfs_rq);
update_min_vruntime(cfs_rq);
update_cfs_shares(cfs_rq);
se->on_rq = 0;
}
/*
@ -2518,8 +2517,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
if (cfs_rq_throttled(cfs_rq))
break;
update_cfs_shares(cfs_rq);
update_entity_load_avg(se, 1);
update_cfs_rq_blocked_load(cfs_rq, 0);
}
if (!se) {
@ -2579,8 +2578,8 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
if (cfs_rq_throttled(cfs_rq))
break;
update_cfs_shares(cfs_rq);
update_entity_load_avg(se, 1);
update_cfs_rq_blocked_load(cfs_rq, 0);
}
if (!se) {
@ -5639,8 +5638,11 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
se = tg->se[i];
/* Propagate contribution to hierarchy */
raw_spin_lock_irqsave(&rq->lock, flags);
for_each_sched_entity(se)
for_each_sched_entity(se) {
update_cfs_shares(group_cfs_rq(se));
/* update contribution to parent */
update_entity_load_avg(se, 1);
}
raw_spin_unlock_irqrestore(&rq->lock, flags);
}