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sched: disable forced preemption by default

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Implement feature bit to disable forced preemption. This way
it can be checked whether a workload is overscheduling or not.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2007-10-15 17:00:14 +02:00
committed by Ingo Molnar
parent e62dd02ed0
commit ce6c131131
2 changed files with 17 additions and 13 deletions
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4
kernel/sched.c
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@@ -444,13 +444,15 @@ enum {
SCHED_FEAT_START_DEBIT = 2,
SCHED_FEAT_TREE_AVG = 4,
SCHED_FEAT_APPROX_AVG = 8,
SCHED_FEAT_WAKEUP_PREEMPT = 16,
};
const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_NEW_FAIR_SLEEPERS *1 |
SCHED_FEAT_START_DEBIT *1 |
SCHED_FEAT_TREE_AVG *0 |
SCHED_FEAT_APPROX_AVG *0;
SCHED_FEAT_APPROX_AVG *0 |
SCHED_FEAT_WAKEUP_PREEMPT *1;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)