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sched: cache hot buddy

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-03-17 09:36:53 +01:00
parent 1fc8afa4c8
commit d25ce4cd49
1 changed files with 9 additions and 7 deletions
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16
kernel/sched.c
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@ -625,20 +625,22 @@ enum {
SCHED_FEAT_NEW_FAIR_SLEEPERS = 1,
SCHED_FEAT_WAKEUP_PREEMPT = 2,
SCHED_FEAT_START_DEBIT = 4,
SCHED_FEAT_HRTICK = 8,
SCHED_FEAT_DOUBLE_TICK = 16,
SCHED_FEAT_SYNC_WAKEUPS = 32,
SCHED_FEAT_AFFINE_WAKEUPS = 64,
SCHED_FEAT_AFFINE_WAKEUPS = 8,
SCHED_FEAT_CACHE_HOT_BUDDY = 16,
SCHED_FEAT_HRTICK = 32,
SCHED_FEAT_DOUBLE_TICK = 64,
SCHED_FEAT_SYNC_WAKEUPS = 128,
};
const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_NEW_FAIR_SLEEPERS * 1 |
SCHED_FEAT_WAKEUP_PREEMPT * 1 |
SCHED_FEAT_START_DEBIT * 1 |
SCHED_FEAT_AFFINE_WAKEUPS * 1 |
SCHED_FEAT_CACHE_HOT_BUDDY * 1 |
SCHED_FEAT_HRTICK * 1 |
SCHED_FEAT_DOUBLE_TICK * 0 |
SCHED_FEAT_SYNC_WAKEUPS * 0 |
SCHED_FEAT_AFFINE_WAKEUPS * 1;
SCHED_FEAT_SYNC_WAKEUPS * 0;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
@ -1519,7 +1521,7 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
/*
* Buddy candidates are cache hot:
*/
if (&p->se == cfs_rq_of(&p->se)->next)
if (sched_feat(CACHE_HOT_BUDDY) && (&p->se == cfs_rq_of(&p->se)->next))
return 1;
if (p->sched_class != &fair_sched_class)