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sched: prevent wakeup over-scheduling

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Prevent wakeup over-scheduling.  Once a task has been preempted by a
task of the same or lower priority, it becomes ineligible for repeated
preemption by same until it has been ticked, or slept.  Instead, the
task is marked for preemption at the next tick.  Tasks of higher
priority still preempt immediately.

Signed-off-by: Mike Galbraith <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Mike Galbraith 2007-10-15 17:00:14 +02:00 • committed by Ingo Molnar
commit 95938a35c5
3 changed files with 15 additions and 4 deletions
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4
kernel/sched.c
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@ -445,6 +445,7 @@ enum {
SCHED_FEAT_TREE_AVG = 4,
SCHED_FEAT_APPROX_AVG = 8,
SCHED_FEAT_WAKEUP_PREEMPT = 16,
SCHED_FEAT_PREEMPT_RESTRICT = 32,
};
const_debug unsigned int sysctl_sched_features =
@ -452,7 +453,8 @@ const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_START_DEBIT *1 |
SCHED_FEAT_TREE_AVG *0 |
SCHED_FEAT_APPROX_AVG *0 |
SCHED_FEAT_WAKEUP_PREEMPT *1;
SCHED_FEAT_WAKEUP_PREEMPT *1 |
SCHED_FEAT_PREEMPT_RESTRICT *1;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)