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| author | Byungchul Park <byungchul.park@lge.com> | 2017-05-12 10:05:59 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-05-23 10:01:33 +0200 |
| commit | a776b968e52895a350d636e6e7fdcb3b10846fa4 (patch) | |
| tree | c9c18d27aeb6b46943daa6fc491eb5e3309f4cbc | |
| parent | de16b91effdbf5aeff8346b99bcd0991a5362db9 (diff) | |
| download | linux-stable-a776b968e52895a350d636e6e7fdcb3b10846fa4.tar.gz linux-stable-a776b968e52895a350d636e6e7fdcb3b10846fa4.tar.bz2 linux-stable-a776b968e52895a350d636e6e7fdcb3b10846fa4.zip | |
sched/deadline: Remove unnecessary condition in push_dl_task()
pick_next_pushable_dl_task(rq) has BUG_ON(rq->cpu != task_cpu(task))
when it returns a task other than NULL, which means that task_cpu(task)
must be rq->cpu. So if task == next_task, then task_cpu(next_task) must
be rq->cpu as well. Remove the redundant condition and make the code simpler.
This way one unnecessary branch and two LOAD operations can be avoided.
Signed-off-by: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Juri Lelli <juri.lelli@arm.com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: <kernel-team@lge.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1494551159-22367-1-git-send-email-byungchul.park@lge.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/sched/deadline.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index a2ce59015642..df6c2912bd60 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1533,7 +1533,7 @@ retry: * then possible that next_task has migrated. */ task = pick_next_pushable_dl_task(rq); - if (task_cpu(next_task) == rq->cpu && task == next_task) { + if (task == next_task) { /* * The task is still there. We don't try * again, some other cpu will pull it when ready. |