Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4bf0b77158d581c952af237aec79d0604b78fe27
Commit: 4bf0b77158d581c952af237aec79d0604b78fe27
Parent: 5d2f5a616d65e3c08acde3195694c4ab8afbc1b7
Author: Peter Zijlstra <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 25 21:08:21 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 21:08:21 2008 +0100
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 <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
kernel/sched_fair.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
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;
-
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