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sched: rt-group: fix RR buglet 

In tick_task_rt() we first call update_curr_rt() which can dequeue a runqueue
due to it running out of runtime, and then we try to requeue it, of it also
having exhausted its RR quota. Obviously requeueing something that is no longer
on the runqueue will not have the expected result.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Daniel K. <dk@uw.no>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-06-19 09:06:59 +02:00 committed by Ingo Molnar
parent ad2a3f13b7
commit 15a8641ead
1 changed files with 3 additions and 1 deletions
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4
kernel/sched_rt.c
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@ -549,8 +549,10 @@ static
void requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
{
struct rt_prio_array *array = &rt_rq->active;
struct list_head *queue = array->queue + rt_se_prio(rt_se);
list_move_tail(&rt_se->run_list, array->queue + rt_se_prio(rt_se));
if (on_rt_rq(rt_se))
list_move_tail(&rt_se->run_list, queue);
}
static void requeue_task_rt(struct rq *rq, struct task_struct *p)