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sched: remove precise CPU load

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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>
This commit is contained in:
Ingo Molnar
2007-10-15 17:00:03 +02:00
parent 8ebc91d936
commit a25707f3ae
3 changed files with 9 additions and 41 deletions
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6
kernel/sched_fair.c
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@@ -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;