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sched: Check for stop task appearance when balancing happens

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We need to do it like we do for the other higher priority classes..

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Cc: Michael wang <wangyun@linux.vnet.ibm.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/336561397137116@web27h.yandex.ru
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai
2014-04-10 17:38:36 +04:00
committed by Ingo Molnar
parent 60e69eed85
commit a1d9a3231e
3 changed files with 16 additions and 5 deletions
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11
kernel/sched/deadline.c
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@@ -1021,8 +1021,17 @@ struct task_struct *pick_next_task_dl(struct rq *rq, struct task_struct *prev)
dl_rq = &rq->dl;
if (need_pull_dl_task(rq, prev))
if (need_pull_dl_task(rq, prev)) {
pull_dl_task(rq);
/*
* pull_rt_task() can drop (and re-acquire) rq->lock; this
* means a stop task can slip in, in which case we need to
* re-start task selection.
*/
if (rq->stop && rq->stop->on_rq)
return RETRY_TASK;
}
/*
* When prev is DL, we may throttle it in put_prev_task().
* So, we update time before we check for dl_nr_running.