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Commit f2e74eea authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar
Browse files

sched: Remove WAKEUP_SYNC feature 



This feature never earned its keep, remove it.

Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301591.6785.42.camel@marge.simson.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 5ca9880c

kernel/sched_fair.c

+0 −4
Original line number Original line Diff line number Diff line
@@ -1658,7 +1658,6 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_ 
	struct task_struct *curr = rq->curr;

	struct task_struct *curr = rq->curr;

	struct sched_entity *se = &curr->se, *pse = &p->se;

	struct sched_entity *se = &curr->se, *pse = &p->se;

	struct cfs_rq *cfs_rq = task_cfs_rq(curr);

	struct cfs_rq *cfs_rq = task_cfs_rq(curr);

	int sync = wake_flags & WF_SYNC;

	int scale = cfs_rq->nr_running >= sched_nr_latency;

	int scale = cfs_rq->nr_running >= sched_nr_latency;





	if (unlikely(rt_prio(p->prio)))

	if (unlikely(rt_prio(p->prio)))
@@ -1691,9 +1690,6 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_ 
	if (unlikely(curr->policy == SCHED_IDLE))

	if (unlikely(curr->policy == SCHED_IDLE))

		goto preempt;

		goto preempt;





	if (sched_feat(WAKEUP_SYNC) && sync)

		goto preempt;



	if (!sched_feat(WAKEUP_PREEMPT))

	if (!sched_feat(WAKEUP_PREEMPT))

		return;

		return;

kernel/sched_features.h

+0 −5
Original line number Original line Diff line number Diff line
@@ -22,11 +22,6 @@ SCHED_FEAT(WAKEUP_PREEMPT, 1) 
 */

 */

SCHED_FEAT(ASYM_GRAN, 1)

SCHED_FEAT(ASYM_GRAN, 1)





/*

 * Always wakeup-preempt SYNC wakeups, see SYNC_WAKEUPS.

 */

SCHED_FEAT(WAKEUP_SYNC, 0)



/*

/*

 * Use the SYNC wakeup hint, pipes and the likes use this to indicate

 * Use the SYNC wakeup hint, pipes and the likes use this to indicate

 * the remote end is likely to consume the data we just wrote, and

 * the remote end is likely to consume the data we just wrote, and