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| author | Gregory Haskins <ghaskins@novell.com> | 2008-04-23 07:13:29 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-05-05 23:56:18 +0200 |
| commit | 8ae121ac8666b0421aa20fd80d4597ec66fa54bc (patch) | |
| tree | 1db411965b1b12029d501ea10ab90fbc8aa4ec62 /kernel/sched_rt.c | |
| parent | 983ed7a66bcec9dc307d89dc7af47cdf209e56af (diff) | |
| download | linux-8ae121ac8666b0421aa20fd80d4597ec66fa54bc.tar.bz2 | |
sched: fix RT task-wakeup logic
Dmitry Adamushko pointed out a logic error in task_wake_up_rt() where we
will always evaluate to "true". You can find the thread here:
http://lkml.org/lkml/2008/4/22/296
In reality, we only want to try to push tasks away when a wake up request is
not going to preempt the current task. So lets fix it.
Note: We introduce test_tsk_need_resched() instead of open-coding the flag
check so that the merge-conflict with -rt should help remind us that we
may need to support NEEDS_RESCHED_DELAYED in the future, too.
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
CC: Dmitry Adamushko <dmitry.adamushko@gmail.com>
CC: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_rt.c')
| -rw-r--r-- | kernel/sched_rt.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index dcd649588593..060e87b0cb1c 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -1098,11 +1098,14 @@ static void post_schedule_rt(struct rq *rq) } } - +/* + * If we are not running and we are not going to reschedule soon, we should + * try to push tasks away now + */ static void task_wake_up_rt(struct rq *rq, struct task_struct *p) { if (!task_running(rq, p) && - (p->prio >= rq->rt.highest_prio) && + !test_tsk_need_resched(rq->curr) && rq->rt.overloaded) push_rt_tasks(rq); } |