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sched: Remove FAIR_SLEEPERS feature

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Our preemption model relies too heavily on sleeper fairness to disable it
without dire consequences.  Remove the feature, and save a branch or two.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301520.6785.40.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2010-03-11 17:17:17 +01:00 committed by Ingo Molnar
parent 6bc6cf2b61
commit 5ca9880c6f
2 changed files with 1 additions and 8 deletions
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2
kernel/sched_fair.c
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@ -738,7 +738,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
vruntime += sched_vslice(cfs_rq, se); vruntime += sched_vslice(cfs_rq, se);
/* sleeps up to a single latency don't count. */ /* sleeps up to a single latency don't count. */
if (!initial && sched_feat(FAIR_SLEEPERS)) { if (!initial) {
unsigned long thresh = sysctl_sched_latency; unsigned long thresh = sysctl_sched_latency;
/* /*

7
kernel/sched_features.h
View file

@ -1,10 +1,3 @@
/*
* Disregards a certain amount of sleep time (sched_latency_ns) and
* considers the task to be running during that period. This gives it
* a service deficit on wakeup, allowing it to run sooner.
*/
SCHED_FEAT(FAIR_SLEEPERS, 1)
/* /*
* Only give sleepers 50% of their service deficit. This allows * Only give sleepers 50% of their service deficit. This allows
* them to run sooner, but does not allow tons of sleepers to * them to run sooner, but does not allow tons of sleepers to