diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2016-10-04 17:29:45 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-03-16 11:46:23 +0300 |
| commit | 0a67d1ee30ef1efe6a412b3590e08734902aed43 (patch) | |
| tree | fbeb69f487b4cd584ab238fbd006d86db60f2a69 | |
| parent | 8a8c69c32778865affcedc2111bb5d938b50516f (diff) | |
| download | linux-0a67d1ee30ef1efe6a412b3590e08734902aed43.tar.xz | |
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>
| -rw-r--r-- | kernel/sched/core.c | 10 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 8 |
2 files changed, 13 insertions, 5 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); } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 7d4f69329634..de4b934ba974 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1331,15 +1331,17 @@ extern const u32 sched_prio_to_wmult[40]; #define DEQUEUE_SLEEP 0x01 #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */ +#define DEQUEUE_NOCLOCK 0x08 /* matches ENQUEUE_NOCLOCK */ #define ENQUEUE_WAKEUP 0x01 #define ENQUEUE_RESTORE 0x02 #define ENQUEUE_MOVE 0x04 +#define ENQUEUE_NOCLOCK 0x08 -#define ENQUEUE_HEAD 0x08 -#define ENQUEUE_REPLENISH 0x10 +#define ENQUEUE_HEAD 0x10 +#define ENQUEUE_REPLENISH 0x20 #ifdef CONFIG_SMP -#define ENQUEUE_MIGRATED 0x20 +#define ENQUEUE_MIGRATED 0x40 #else #define ENQUEUE_MIGRATED 0x00 #endif |