diff options
| author | Mike Galbraith <efault@gmx.de> | 2008-05-12 21:20:55 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-06 15:19:27 +0200 |
| commit | f333fdc9098b71e2687e4e9b6349fcb352960d66 (patch) | |
| tree | 0abe4a006b351aa2fc675e5fcc227aeea67c0ba6 /kernel | |
| parent | 45c01e824991b2dd0a332e19efc4901acb31209f (diff) | |
| download | blackbird-op-linux-f333fdc9098b71e2687e4e9b6349fcb352960d66.tar.gz blackbird-op-linux-f333fdc9098b71e2687e4e9b6349fcb352960d66.zip | |
sched: make !hrtick faster
it is safe to ignore timers and flags when the feature is disabled.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 7178b8c2351c..aa960b84b881 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4134,7 +4134,7 @@ asmlinkage void __sched schedule(void) struct task_struct *prev, *next; unsigned long *switch_count; struct rq *rq; - int cpu; + int cpu, hrtick = sched_feat(HRTICK); need_resched: preempt_disable(); @@ -4149,7 +4149,8 @@ need_resched_nonpreemptible: schedule_debug(prev); - hrtick_clear(rq); + if (hrtick) + hrtick_clear(rq); /* * Do the rq-clock update outside the rq lock: @@ -4197,7 +4198,8 @@ need_resched_nonpreemptible: } else spin_unlock_irq(&rq->lock); - hrtick_set(rq); + if (hrtick) + hrtick_set(rq); if (unlikely(reacquire_kernel_lock(current) < 0)) goto need_resched_nonpreemptible; |
