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sched: Remove WAKEUP_SYNC feature
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This feature never earned its keep, remove it.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301591.6785.42.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Mike Galbraith authored and Ingo Molnar committed Mar 11, 2010
1 parent 5ca9880 commit f2e74ee
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Showing 2 changed files with 0 additions and 9 deletions.
4 changes: 0 additions & 4 deletions kernel/sched_fair.c
Original file line number Diff line number Diff line change
Expand Up @@ -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 sched_entity *se = &curr->se, *pse = &p->se;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
int sync = wake_flags & WF_SYNC;
int scale = cfs_rq->nr_running >= sched_nr_latency;

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

if (sched_feat(WAKEUP_SYNC) && sync)
goto preempt;

if (!sched_feat(WAKEUP_PREEMPT))
return;

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5 changes: 0 additions & 5 deletions kernel/sched_features.h
Original file line number Diff line number Diff line change
Expand Up @@ -22,11 +22,6 @@ SCHED_FEAT(WAKEUP_PREEMPT, 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
* the remote end is likely to consume the data we just wrote, and
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