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sched: Add WAKEUP_PREEMPTION feature flag, on by default 

As per the recent discussion with Mike and Linus, make it easier to
test with/without this feature. No change in default behavior.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-izoxq4haeg4mTognnDbwcevt@git.kernel.org
This commit is contained in:
Ingo Molnar 2012-10-14 14:28:50 +02:00 committed by Ingo Molnar
parent 301a5cba28
commit 8ed92e51f9
2 changed files with 6 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -2907,7 +2907,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
* Batch and idle tasks do not preempt non-idle tasks (their preemption
* is driven by the tick):
*/
if (unlikely(p->policy != SCHED_NORMAL))
if (unlikely(p->policy != SCHED_NORMAL) || !sched_feat(WAKEUP_PREEMPTION))
return;
find_matching_se(&se, &pse);

5
kernel/sched/features.h
View File

@ -31,6 +31,11 @@ SCHED_FEAT(LAST_BUDDY, true)
*/
SCHED_FEAT(CACHE_HOT_BUDDY, true)
/*
* Allow wakeup-time preemption of the current task:
*/
SCHED_FEAT(WAKEUP_PREEMPTION, true)
/*
* Use arch dependent cpu power functions
*/