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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;
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;