From 5ca9880c6f4ba4c84b517bc2fed5366adf63d191 Mon Sep 17 00:00:00 2001 From: Mike Galbraith Date: Thu, 11 Mar 2010 17:17:17 +0100 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra LKML-Reference: <1268301520.6785.40.camel@marge.simson.net> Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 2 +- kernel/sched_features.h | 7 ------- 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index de98e2e9d6e1..97682f925ed5 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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; /* diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 404288354aee..850f9809cf81 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -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 * them to run sooner, but does not allow tons of sleepers to -- 2.20.1