Messages in this thread Patch in this message | | | Date | Thu, 11 Mar 2010 18:32:33 GMT | From | tip-bot for Mike Galbraith <> | Subject | [tip:sched/core] sched: Remove FAIR_SLEEPERS feature |
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Commit-ID: 5ca9880c6f4ba4c84b517bc2fed5366adf63d191 Gitweb: http://git.kernel.org/tip/5ca9880c6f4ba4c84b517bc2fed5366adf63d191 Author: Mike Galbraith <efault@gmx.de> AuthorDate: Thu, 11 Mar 2010 17:17:17 +0100 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Thu, 11 Mar 2010 18:32:52 +0100
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> --- kernel/sched_fair.c | 2 +- kernel/sched_features.h | 7 ------- 2 files changed, 1 insertions(+), 8 deletions(-)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index de98e2e..97682f9 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 4042883..850f980 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -1,11 +1,4 @@ /* - * 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 * rip the spread apart.
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