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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-01-25 21:08:21 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:21 +0100 |
| commit | 4bf0b77158d581c952af237aec79d0604b78fe27 (patch) | |
| tree | d2500b882a4ed7e9a97e8633120a6e6aeccfa0c3 /kernel/sched_fair.c | |
| parent | 5d2f5a616d65e3c08acde3195694c4ab8afbc1b7 (diff) | |
| download | lwn-4bf0b77158d581c952af237aec79d0604b78fe27.tar.gz lwn-4bf0b77158d581c952af237aec79d0604b78fe27.zip | |
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>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | 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 2208692dc4a0..10aa6e1ae3dd 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; |