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Commit c6ee36c4 authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar
Browse files

sched: Remove SYNC_WAKEUPS feature 



Sync wakeups are critical functionality with a long history.  Remove it, we don't
need the branch or icache footprint.

Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301817.6785.47.camel@marge.simson.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f2e74eea

kernel/sched.c

+0 −3
Original line number Diff line number Diff line
@@ -2369,9 +2369,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, 
	unsigned long flags;

	struct rq *rq;



	if (!sched_feat(SYNC_WAKEUPS))

		wake_flags &= ~WF_SYNC;



	this_cpu = get_cpu();



	smp_wmb();

kernel/sched_features.h

+0 −8
Original line number Diff line number Diff line
@@ -22,14 +22,6 @@ SCHED_FEAT(WAKEUP_PREEMPT, 1) 
 */

SCHED_FEAT(ASYM_GRAN, 1)



/*

 * 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

 * therefore has cache benefit from being placed on the same cpu, see

 * also AFFINE_WAKEUPS.

 */

SCHED_FEAT(SYNC_WAKEUPS, 1)



/*

 * Based on load and program behaviour, see if it makes sense to place

 * a newly woken task on the same cpu as the task that woke it --