Commit 4bf0b771 authored Jan 25, 2008 by Peter Zijlstra Committed by Ingo Molnar Jan 25, 2008

sched: remove do_div() from __sched_slice()



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>

parent 5d2f5a61

kernel/sched_fair.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;