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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:18 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:18 +0200 |
| commit | 91c234b4e3419c786cac2d5b7a7b96443e512e3a (patch) | |
| tree | 4d8d04c685147d8f05d5687550f1ad0862258d2f /kernel/sched_fair.c | |
| parent | fb7dde37ece82e13de383afd7042c45df67a9d17 (diff) | |
| download | kernel_samsung_aries-91c234b4e3419c786cac2d5b7a7b96443e512e3a.zip kernel_samsung_aries-91c234b4e3419c786cac2d5b7a7b96443e512e3a.tar.gz kernel_samsung_aries-91c234b4e3419c786cac2d5b7a7b96443e512e3a.tar.bz2 | |
sched: do not wakeup-preempt with SCHED_BATCH tasks
do not wakeup-preempt with SCHED_BATCH tasks, their preemption
is batched too, driven by the tick.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index ec1592e..c240b72 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -828,6 +828,12 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) resched_task(curr); return; } + /* + * Batch tasks do not preempt (their preemption is driven by + * the tick): + */ + if (unlikely(p->policy == SCHED_BATCH)) + return; if (sched_feat(WAKEUP_PREEMPT)) { while (!is_same_group(se, pse)) { |