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| author | Kirill Tkhai <tkhai@yandex.ru> | 2014-04-10 17:38:36 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-04-17 13:39:51 +0200 |
| commit | a1d9a3231eac4117cadaf4b6bba5b2902c15a33e (patch) | |
| tree | ea81cd4c9553b0ae0adb4357b578ba3cefc2dccf /kernel/sched/deadline.c | |
| parent | 60e69eed85bb7b5198ef70643b5895c26ad76ef7 (diff) | |
| download | lwn-a1d9a3231eac4117cadaf4b6bba5b2902c15a33e.tar.gz lwn-a1d9a3231eac4117cadaf4b6bba5b2902c15a33e.zip | |
sched: Check for stop task appearance when balancing happens
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>
Diffstat (limited to 'kernel/sched/deadline.c')
| -rw-r--r-- | kernel/sched/deadline.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 27ef40925525..b08095786cb8 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -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. |