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Commit 5ca9880c authored Mar 11, 2010 by Mike Galbraith Committed by Ingo Molnar Mar 11, 2010

sched: Remove FAIR_SLEEPERS feature



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>

parent 6bc6cf2b

kernel/sched_fair.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -738,7 +738,7 @@ place_entity(struct cfs_rq cfs_rq, struct sched_entity se, int initial)
		vruntime += sched_vslice(cfs_rq, se);

		/* sleeps up to a single latency don't count. */
		if (!initial && sched_feat(FAIR_SLEEPERS)) {
		if (!initial) {
		unsigned long thresh = sysctl_sched_latency;

		/*

kernel/sched_features.h

+0 −7

Original line number	Diff line number	Diff line
		/*
		* 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
		* them to run sooner, but does not allow tons of sleepers to