Commit b0aa51b9 authored Oct 17, 2008 by Mike Galbraith Committed by Ingo Molnar Oct 17, 2008

sched: minor fast-path overhead reduction



Greetings,

103638d9 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>

parent b9689052

kernel/sched_fair.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -747,7 +747,7 @@ pick_next(struct cfs_rq cfs_rq, struct sched_entity se)
		struct rq *rq = rq_of(cfs_rq);
		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;
		return se;
		}