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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 311e800e16 ("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>
This commit is contained in:
Wanpeng Li 2014-11-06 15:22:44 +08:00 committed by Ingo Molnar
parent cb0b9f2445
commit c51b8ab5ad
1 changed files with 3 additions and 2 deletions
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5
kernel/sched/deadline.c
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@ -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)