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
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@ -2907,7 +2907,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
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* Batch and idle tasks do not preempt non-idle tasks (their preemption
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* Batch and idle tasks do not preempt non-idle tasks (their preemption
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* is driven by the tick):
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* is driven by the tick):
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*/
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*/
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if (unlikely(p->policy != SCHED_NORMAL))
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if (unlikely(p->policy != SCHED_NORMAL) || !sched_feat(WAKEUP_PREEMPTION))
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return;
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return;
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find_matching_se(&se, &pse);
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find_matching_se(&se, &pse);
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@ -31,6 +31,11 @@ SCHED_FEAT(LAST_BUDDY, true)
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*/
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*/
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SCHED_FEAT(CACHE_HOT_BUDDY, true)
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SCHED_FEAT(CACHE_HOT_BUDDY, true)
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/*
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* Allow wakeup-time preemption of the current task:
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*/
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SCHED_FEAT(WAKEUP_PREEMPTION, true)
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/*
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/*
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* Use arch dependent cpu power functions
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* Use arch dependent cpu power functions
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*/
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*/
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