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sched: minor fast-path overhead reduction 

Greetings,

103638d added a bit of avoidable overhead to the fast-path.

Use sysctl_sched_min_granularity instead of sched_slice() to restrict buddy wakeups.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2008-10-17 15:33:21 +02:00 committed by Ingo Molnar
parent b968905292
commit b0aa51b999
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_fair.c
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@ -747,7 +747,7 @@ pick_next(struct cfs_rq *cfs_rq, struct sched_entity *se)
struct rq *rq = rq_of(cfs_rq); struct rq *rq = rq_of(cfs_rq);
u64 pair_slice = rq->clock - cfs_rq->pair_start; u64 pair_slice = rq->clock - cfs_rq->pair_start;
if (!cfs_rq->next || pair_slice > sched_slice(cfs_rq, cfs_rq->next)) { if (!cfs_rq->next || pair_slice > sysctl_sched_min_granularity) {
cfs_rq->pair_start = rq->clock; cfs_rq->pair_start = rq->clock;
return se; return se;
} }