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| author | Ingo Molnar <mingo@elte.hu> | 2008-03-16 20:03:22 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-19 19:44:57 +0200 |
| commit | b85d0667268320072ccdeb07c27c25b300ab3724 (patch) | |
| tree | 34bc3926e6524d82d450df5531744fff6b4df560 /kernel/sched.c | |
| parent | sched: fix wakeup granularity for buddies (diff) | |
| download | linux-b85d0667268320072ccdeb07c27c25b300ab3724.tar.xz linux-b85d0667268320072ccdeb07c27c25b300ab3724.zip | |
sched: introduce SCHED_FEAT_SYNC_WAKEUPS, turn it off
turn off sync wakeups by default. They are not needed anymore - the
buddy logic should be smart enough to keep the system from
overscheduling.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index d8456a9ac9af..263e25e10204 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -627,6 +627,7 @@ enum { SCHED_FEAT_START_DEBIT = 4, SCHED_FEAT_HRTICK = 8, SCHED_FEAT_DOUBLE_TICK = 16, + SCHED_FEAT_SYNC_WAKEUPS = 32, }; const_debug unsigned int sysctl_sched_features = @@ -634,7 +635,8 @@ const_debug unsigned int sysctl_sched_features = SCHED_FEAT_WAKEUP_PREEMPT * 1 | SCHED_FEAT_START_DEBIT * 1 | SCHED_FEAT_HRTICK * 1 | - SCHED_FEAT_DOUBLE_TICK * 0; + SCHED_FEAT_DOUBLE_TICK * 0 | + SCHED_FEAT_SYNC_WAKEUPS * 0; #define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x) @@ -1916,6 +1918,9 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) long old_state; struct rq *rq; + if (!sched_feat(SYNC_WAKEUPS)) + sync = 0; + smp_wmb(); rq = task_rq_lock(p, &flags); old_state = p->state; |