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Commit 0a67d1ee authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent 8a8c69c3

kernel/sched/core.c

+8 −2
Original line number Diff line number Diff line
@@ -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)

{

	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)

{

	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);

}

kernel/sched/sched.h

+5 −3
Original line number Diff line number Diff line
@@ -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