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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: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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1 changed files with 4 additions and 2 deletions
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@ -528,8 +528,10 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
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if (!initial) {
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/* sleeps upto a single latency don't count. */
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if (sched_feat(NEW_FAIR_SLEEPERS))
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vruntime -= sysctl_sched_latency;
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if (sched_feat(NEW_FAIR_SLEEPERS)) {
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vruntime -= calc_delta_fair(sysctl_sched_latency,
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&cfs_rq->load);
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}
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/* ensure we never gain time by being placed backwards. */
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vruntime = max_vruntime(se->vruntime, vruntime);
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