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| author | Peter Zijlstra | 2016-10-04 16:29:45 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2017-03-16 09:46:23 +0100 |
| commit | 0a67d1ee30ef1efe6a412b3590e08734902aed43 (patch) | |
| tree | fbeb69f487b4cd584ab238fbd006d86db60f2a69 /kernel/sched/core.c | |
| parent | sched/core: Add rq->lock wrappers (diff) | |
| download | kernel-qcow2-linux-0a67d1ee30ef1efe6a412b3590e08734902aed43.tar.gz kernel-qcow2-linux-0a67d1ee30ef1efe6a412b3590e08734902aed43.tar.xz kernel-qcow2-linux-0a67d1ee30ef1efe6a412b3590e08734902aed43.zip | |
sched/core: Add {EN,DE}QUEUE_NOCLOCK flags
Currently {en,de}queue_task() do an unconditional update_rq_clock().
However since we want to avoid duplicate updates, so that each
rq->lock section appears atomic in time, we need to be able to skip
these clock updates.
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/core.c')
| -rw-r--r-- | kernel/sched/core.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c5a514b1668d..ce363bdc7e6b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -752,17 +752,23 @@ static void set_load_weight(struct task_struct *p) static inline void enqueue_task(struct rq *rq, struct task_struct *p, int flags) { - update_rq_clock(rq); + if (!(flags & ENQUEUE_NOCLOCK)) + update_rq_clock(rq); + if (!(flags & ENQUEUE_RESTORE)) sched_info_queued(rq, p); + p->sched_class->enqueue_task(rq, p, flags); } static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags) { - update_rq_clock(rq); + if (!(flags & DEQUEUE_NOCLOCK)) + update_rq_clock(rq); + if (!(flags & DEQUEUE_SAVE)) sched_info_dequeued(rq, p); + p->sched_class->dequeue_task(rq, p, flags); } |