Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=91c234b4e3419c786cac2d5b7a7b96443e512e3a
Commit: 91c234b4e3419c786cac2d5b7a7b96443e512e3a
Parent: fb7dde37ece82e13de383afd7042c45df67a9d17
Author: Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 15 17:00:18 2007 +0200
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Mon Oct 15 17:00:18 2007 +0200
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 <[EMAIL PROTECTED]>
---
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)) {
-
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