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Commit 8ed92e51 authored by Ingo Molnar's avatar Ingo Molnar Committed by Ingo Molnar
Browse files

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: default avatarIngo 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
parent 301a5cba

kernel/sched/fair.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

kernel/sched/features.h

+5 −0
Original line number Diff line number Diff line
@@ -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

 */