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| author | Wanpeng Li <wanpeng.li@linux.intel.com> | 2014-11-06 15:22:44 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-11-16 10:58:57 +0100 |
| commit | c51b8ab5ad972df26fd9c0ffad34870e98273c4c (patch) | |
| tree | 793a6523061af08880dd5982f44719aac0df0a2d /kernel/sched/deadline.c | |
| parent | cb0b9f2445cdf9893352e4548582a2892af7137c (diff) | |
| download | lwn-c51b8ab5ad972df26fd9c0ffad34870e98273c4c.tar.gz lwn-c51b8ab5ad972df26fd9c0ffad34870e98273c4c.zip | |
sched/deadline: Fix rq->dl.pushable_tasks bug in push_dl_task()
Do not call dequeue_pushable_dl_task() when failing to push an eligible
task, as it remains pushable, merely not at this particular moment.
Actually the patch is the same behavior as commit 311e800e16f6 ("sched,
rt: Fix rq->rt.pushable_tasks bug in push_rt_task()" in -rt side.
Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Kirill Tkhai <ktkhai@parallels.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1415258564-8573-1-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/deadline.c')
| -rw-r--r-- | kernel/sched/deadline.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index bb1464baee84..9594c128ff17 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1328,6 +1328,7 @@ static int push_dl_task(struct rq *rq) { struct task_struct *next_task; struct rq *later_rq; + int ret = 0; if (!rq->dl.overloaded) return 0; @@ -1373,7 +1374,6 @@ retry: * The task is still there. We don't try * again, some other cpu will pull it when ready. */ - dequeue_pushable_dl_task(rq, next_task); goto out; } @@ -1389,6 +1389,7 @@ retry: deactivate_task(rq, next_task, 0); set_task_cpu(next_task, later_rq->cpu); activate_task(later_rq, next_task, 0); + ret = 1; resched_curr(later_rq); @@ -1397,7 +1398,7 @@ retry: out: put_task_struct(next_task); - return 1; + return ret; } static void push_dl_tasks(struct rq *rq) |