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sched: old sleeper bonus

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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-03-19 11:43:36 +01:00 committed by Ingo Molnar
parent cd8ba7cd9b
commit 112f53f5d7
2 changed files with 8 additions and 3 deletions
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4
kernel/sched.c
View File

@ -680,6 +680,7 @@ enum {
SCHED_FEAT_SYNC_WAKEUPS = 32,
SCHED_FEAT_HRTICK = 64,
SCHED_FEAT_DOUBLE_TICK = 128,
SCHED_FEAT_NORMALIZED_SLEEPER = 256,
};
const_debug unsigned int sysctl_sched_features =
@ -690,7 +691,8 @@ const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_CACHE_HOT_BUDDY * 1 |
SCHED_FEAT_SYNC_WAKEUPS * 1 |
SCHED_FEAT_HRTICK * 1 |
SCHED_FEAT_DOUBLE_TICK * 0;
SCHED_FEAT_DOUBLE_TICK * 0 |
SCHED_FEAT_NORMALIZED_SLEEPER * 1;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)

7
kernel/sched_fair.c
View File

@ -501,8 +501,11 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
if (!initial) {
/* sleeps upto a single latency don't count. */
if (sched_feat(NEW_FAIR_SLEEPERS)) {
vruntime -= calc_delta_fair(sysctl_sched_latency,
&cfs_rq->load);
if (sched_feat(NORMALIZED_SLEEPER))
vruntime -= calc_delta_fair(sysctl_sched_latency,
&cfs_rq->load);
else
vruntime -= sysctl_sched_latency;
}
/* ensure we never gain time by being placed backwards. */