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authorMike Galbraith <efault@gmx.de>2007-10-15 17:00:14 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:14 +0200
commit95938a35c5562afa7af7252821e44132391a3db8 (patch)
tree548cda134d007105f3a819a438ab384ab9f04e27 /kernel/sched.c
parentce6c131131df442f0d49d064129ecc52d9fe8ca9 (diff)
downloadop-kernel-dev-95938a35c5562afa7af7252821e44132391a3db8.zip
op-kernel-dev-95938a35c5562afa7af7252821e44132391a3db8.tar.gz
sched: prevent wakeup over-scheduling
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 <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 0bd8f2c..e8051bd 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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)
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