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authorIngo Molnar <mingo@elte.hu>2008-03-17 09:36:53 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:57 +0200
commitd25ce4cd499a21aab89ff8755f8c4a2800eae25f (patch)
treea70f58303a4b1fabfffbf097188a6c67a888ee0e /kernel
parent1fc8afa4c820fcde3658238eab5c010476ede521 (diff)
sched: cache hot buddy
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 7c5efad78c0..42d2f1155d3 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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)