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| author |   Peter Zijlstra <peterz@infradead.org> | 2017-02-21 14:36:23 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-03-16 09:46:24 +0100 |
| commit | 77558e4d01ac0c7fa8cb1af4a61c2ab508d79f30 (patch) | |
| tree | da226c41a6eff545e088fb8a45af973d63e9f3d5 /kernel/sched | |
| parent | sched/core: Add ENQUEUE_NOCLOCK to ENQUEUE_RESTORE (diff) | |
| download | linux-dev-77558e4d01ac0c7fa8cb1af4a61c2ab508d79f30.tar.xz linux-dev-77558e4d01ac0c7fa8cb1af4a61c2ab508d79f30.zip | |
sched/core: Make sched_ttwu_pending() atomic in time
Since all tasks on the wake_list are woken under a single rq->lock
avoid calling update_rq_clock() for each task.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 247d0a0c319e..dead90d680fd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1685,7 +1685,7 @@ static void ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags, struct rq_flags *rf) { - int en_flags = ENQUEUE_WAKEUP; + int en_flags = ENQUEUE_WAKEUP | ENQUEUE_NOCLOCK; lockdep_assert_held(&rq->lock); @@ -1737,6 +1737,7 @@ void sched_ttwu_pending(void) return; rq_lock_irqsave(rq, &rf); + update_rq_clock(rq); while (llist) { int wake_flags = 0; @@ -1849,6 +1850,7 @@ static void ttwu_queue(struct task_struct *p, int cpu, int wake_flags) #endif rq_lock(rq, &rf); + update_rq_clock(rq); ttwu_do_activate(rq, p, wake_flags, &rf); rq_unlock(rq, &rf); } |