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sched: make !hrtick faster

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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>
This commit is contained in:
Mike Galbraith
2008-05-12 21:20:55 +02:00
committed by Ingo Molnar
parent 45c01e8249
commit f333fdc909
1 changed files with 5 additions and 3 deletions
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8
kernel/sched.c
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@@ -4134,7 +4134,7 @@ asmlinkage void __sched schedule(void)
struct task_struct *prev, *next; struct task_struct *prev, *next;
unsigned long *switch_count; unsigned long *switch_count;
struct rq *rq; struct rq *rq;
int cpu; int cpu, hrtick = sched_feat(HRTICK);
need_resched: need_resched:
preempt_disable(); preempt_disable();
@@ -4149,7 +4149,8 @@ need_resched_nonpreemptible:
schedule_debug(prev); schedule_debug(prev);
hrtick_clear(rq); if (hrtick)
hrtick_clear(rq);
/* /*
* Do the rq-clock update outside the rq lock: * Do the rq-clock update outside the rq lock:
@@ -4197,7 +4198,8 @@ need_resched_nonpreemptible:
} else } else
spin_unlock_irq(&rq->lock); spin_unlock_irq(&rq->lock);
hrtick_set(rq); if (hrtick)
hrtick_set(rq);
if (unlikely(reacquire_kernel_lock(current) < 0)) if (unlikely(reacquire_kernel_lock(current) < 0))
goto need_resched_nonpreemptible; goto need_resched_nonpreemptible;