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| author | Mike Galbraith <efault@gmx.de> | 2010-03-11 17:16:43 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-11 18:32:53 +0100 |
| commit | c6ee36c423c3ed1fb86bb3eabba9fc256a300d16 (patch) | |
| tree | a7c98864e3a5c84fac57e8f0ce8777f83df81372 | |
| parent | f2e74eeac03ffb779d64b66a643c5e598145a28b (diff) | |
| download | op-kernel-dev-c6ee36c423c3ed1fb86bb3eabba9fc256a300d16.zip op-kernel-dev-c6ee36c423c3ed1fb86bb3eabba9fc256a300d16.tar.gz | |
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: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301817.6785.47.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 3 | ||||
| -rw-r--r-- | kernel/sched_features.h | 8 |
2 files changed, 0 insertions, 11 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 16559de..cc6dc8c 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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(); diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 1cb7c47..f54b6f9 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -23,14 +23,6 @@ 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 -- * improve cache locality. Typically used with SYNC wakeups as |
