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sched/deadline: Fix rq->dl.pushable_tasks bug in push_dl_task()

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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 task_struct *next_task;
struct rq *later_rq; struct rq *later_rq;
int ret = 0;
if (!rq->dl.overloaded) if (!rq->dl.overloaded)
return 0; return 0;
@@ -1373,7 +1374,6 @@ retry:
* The task is still there. We don't try * The task is still there. We don't try
* again, some other cpu will pull it when ready. * again, some other cpu will pull it when ready.
*/ */
dequeue_pushable_dl_task(rq, next_task);
goto out; goto out;
} }
@@ -1389,6 +1389,7 @@ retry:
deactivate_task(rq, next_task, 0); deactivate_task(rq, next_task, 0);
set_task_cpu(next_task, later_rq->cpu); set_task_cpu(next_task, later_rq->cpu);
activate_task(later_rq, next_task, 0); activate_task(later_rq, next_task, 0);
ret = 1;
resched_curr(later_rq); resched_curr(later_rq);
@@ -1397,7 +1398,7 @@ retry:
out: out:
put_task_struct(next_task); put_task_struct(next_task);
return 1; return ret;
} }
static void push_dl_tasks(struct rq *rq) static void push_dl_tasks(struct rq *rq)