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Commit e22ecef1 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: fix fair sleepers 



Fair sleepers need to scale their latency target down by runqueue
weight. Otherwise busy systems will gain ever larger sleep bonus.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
parent aa2ac252

kernel/sched_fair.c

+4 −2
Original line number Diff line number Diff line
@@ -528,8 +528,10 @@ 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 -= sysctl_sched_latency;

		if (sched_feat(NEW_FAIR_SLEEPERS)) {

			vruntime -= calc_delta_fair(sysctl_sched_latency,

						    &cfs_rq->load);

		}



		/* ensure we never gain time by being placed backwards. */

		vruntime = max_vruntime(se->vruntime, vruntime);