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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-16 08:54:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-16 09:05:20 +0200 |
| commit | 51e0304ce6e55a6e59658558916b4f74da085ff0 (patch) | |
| tree | da17f8f9f1b3b0431cd0cd1e90ea95f970654f9f /kernel/sched_features.h | |
| parent | 59abf02644c45f1591e1374ee7bb45dc757fcb88 (diff) | |
| download | lwn-51e0304ce6e55a6e59658558916b4f74da085ff0.tar.gz lwn-51e0304ce6e55a6e59658558916b4f74da085ff0.zip | |
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 <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_features.h')
| -rw-r--r-- | kernel/sched_features.h | 9 |
1 files changed, 8 insertions, 1 deletions
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 |