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sched/fair: Avoid checking cfs_rq->nr_running twice

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Rearrange pick_next_task_fair() a bit to avoid checking
cfs_rq->nr_running twice for the case where FAIR_GROUP_SCHED is enabled
and the previous task doesn't belong to the fair class.

Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vincent Guittot <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/000903ab3df3350943d3271c53615893a230dc95.1495603536.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Viresh Kumar 2017-05-24 10:59:55 +05:30 • committed by Ingo Molnar
commit 9674f5cad2
1 changed files with 9 additions and 7 deletions
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16
kernel/sched/fair.c
View file

@ -6187,10 +6187,10 @@ pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf
int new_tasks;
again:
#ifdef CONFIG_FAIR_GROUP_SCHED
if (!cfs_rq->nr_running)
goto idle;
#ifdef CONFIG_FAIR_GROUP_SCHED
if (prev->sched_class != &fair_sched_class)
goto simple;
@ -6220,11 +6220,17 @@ again:
/*
* This call to check_cfs_rq_runtime() will do the
* throttle and dequeue its entity in the parent(s).
* Therefore the 'simple' nr_running test will indeed
* Therefore the nr_running test will indeed
* be correct.
*/
if (unlikely(check_cfs_rq_runtime(cfs_rq)))
if (unlikely(check_cfs_rq_runtime(cfs_rq))) {
cfs_rq = &rq->cfs;
if (!cfs_rq->nr_running)
goto idle;
goto simple;
}
}
se = pick_next_entity(cfs_rq, curr);
@ -6264,12 +6270,8 @@ again:
return p;
simple:
cfs_rq = &rq->cfs;
#endif
if (!cfs_rq->nr_running)
goto idle;
put_prev_task(rq, prev);
do {