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sched: remove do_div() from __sched_slice()

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Yanmin Zhang noticed a nice optimization:

  p = l * nr / nl, nl = l/g -> p = g * nr

which eliminates a do_div() from __sched_period().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-01-25 21:08:21 +01:00 committed by Ingo Molnar
parent 5d2f5a616d
commit 4bf0b77158
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_fair.c
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@ -248,8 +248,8 @@ static u64 __sched_period(unsigned long nr_running)
unsigned long nr_latency = sched_nr_latency;
if (unlikely(nr_running > nr_latency)) {
period = sysctl_sched_min_granularity;
period *= nr_running;
do_div(period, nr_latency);
}
return period;