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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:18 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:18 +0200
commit91c234b4e3419c786cac2d5b7a7b96443e512e3a (patch)
tree4d8d04c685147d8f05d5687550f1ad0862258d2f
parentfb7dde37ece82e13de383afd7042c45df67a9d17 (diff)
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>
-rw-r--r--kernel/sched_fair.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index ec1592eb8d0..c240b72b4e6 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)) {