From 51e0304ce6e55a6e59658558916b4f74da085ff0 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 16 Sep 2009 08:54:45 +0200 Subject: sched: Implement a gentler fair-sleepers feature Add back FAIR_SLEEPERS and GENTLE_FAIR_SLEEPERS. FAIR_SLEEPERS is the old logic: credit sleepers with their sleep time. GENTLE_FAIR_SLEEPERS dampens this a bit: 50% of their sleep time gets credited. The hope here is to still give the benefits of fair-sleepers logic (quick wakeups, etc.) while not allow them to have 100% of their sleep time as if they were running. Cc: Peter Zijlstra Cc: Mike Galbraith LKML-Reference: Signed-off-by: Ingo Molnar --- kernel/sched_features.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'kernel/sched_features.h') diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 70115c69c7a9..fd375675f834 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -3,7 +3,14 @@ * considers the task to be running during that period. This gives it * a service deficit on wakeup, allowing it to run sooner. */ -SCHED_FEAT(NEW_FAIR_SLEEPERS, 0) +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. + */ +SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1) /* * By not normalizing the sleep time, heavy tasks get an effective -- cgit v1.2.3