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| author | Ingo Molnar <mingo@elte.hu> | 2012-10-14 14:28:50 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-10-16 10:05:27 +0200 |
| commit | 8ed92e51f99c2199c64cb33b4ba95ab12940a94c (patch) | |
| tree | b7d067cc9db5379a0107e97a6b4dfe64afead461 | |
| parent | 301a5cba2887d1f640e6d5184b05a6d7132017d5 (diff) | |
| download | op-kernel-dev-8ed92e51f99c2199c64cb33b4ba95ab12940a94c.zip op-kernel-dev-8ed92e51f99c2199c64cb33b4ba95ab12940a94c.tar.gz | |
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
| -rw-r--r-- | kernel/sched/fair.c | 2 | ||||
| -rw-r--r-- | kernel/sched/features.h | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6b800a1..f936552 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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); diff --git a/kernel/sched/features.h b/kernel/sched/features.h index eebefca..e68e69a 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -32,6 +32,11 @@ 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 */ SCHED_FEAT(ARCH_POWER, true) |
