From 4bf0b77158d581c952af237aec79d0604b78fe27 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 25 Jan 2008 21:08:21 +0100 Subject: [PATCH] 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 Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 2208692..10aa6e1 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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; -- 2.7.4