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authorIngo Molnar <mingo@elte.hu>2009-09-16 06:54:45 (GMT)
committerIngo Molnar <mingo@elte.hu>2009-09-16 07:05:20 (GMT)
commit51e0304ce6e55a6e59658558916b4f74da085ff0 (patch)
treeda17f8f9f1b3b0431cd0cd1e90ea95f970654f9f /kernel/sched_features.h
parent59abf02644c45f1591e1374ee7bb45dc757fcb88 (diff)
downloadlinux-51e0304ce6e55a6e59658558916b4f74da085ff0.tar.xz
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.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 70115c6..fd37567 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