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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:03 +0200 |
| commit | a25707f3aef9cf68c341eba5960d580f364e4e6f (patch) | |
| tree | 77f13a0d32f68217cf6be32b1ab755bf7c1c0665 /kernel/sched_fair.c | |
| parent | 8ebc91d93669af39dbed50914d7daf457eeb43be (diff) | |
| download | lwn-a25707f3aef9cf68c341eba5960d580f364e4e6f.tar.gz lwn-a25707f3aef9cf68c341eba5960d580f364e4e6f.zip | |
sched: remove precise CPU load
CPU load calculations are statistical anyway, and there's little benefit
from having it calculated on every scheduling event. So remove this code,
it gets rid of a divide from the scheduler wakeup and context-switch
fastpath.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 2138c40f4836..105d57b41aa2 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -94,16 +94,14 @@ enum { SCHED_FEAT_FAIR_SLEEPERS = 1, SCHED_FEAT_SLEEPER_AVG = 2, SCHED_FEAT_SLEEPER_LOAD_AVG = 4, - SCHED_FEAT_PRECISE_CPU_LOAD = 8, - SCHED_FEAT_START_DEBIT = 16, - SCHED_FEAT_SKIP_INITIAL = 32, + SCHED_FEAT_START_DEBIT = 8, + SCHED_FEAT_SKIP_INITIAL = 16, }; const_debug unsigned int sysctl_sched_features = SCHED_FEAT_FAIR_SLEEPERS *1 | SCHED_FEAT_SLEEPER_AVG *0 | SCHED_FEAT_SLEEPER_LOAD_AVG *1 | - SCHED_FEAT_PRECISE_CPU_LOAD *1 | SCHED_FEAT_START_DEBIT *1 | SCHED_FEAT_SKIP_INITIAL *0; |