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Use num_possible_cpus() instead of NR_CPUS for timer distribution

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To avoid lock contention, we distribute the sched_timer calls across the
cpus so they do not trigger at the same instant.  However, I used NR_CPUS,
which can cause needless grouping on small smp systems depending on your
kernel config.  This patch converts to using num_possible_cpus() so we
spread it as evenly as possible on every machine.

Briefly tested w/ NR_CPUS=255 and verified reduced contention.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
john stultz 2007-10-16 23:27:18 -07:00 committed by Linus Torvalds
parent 3075d9da0b
commit b2d9323d13
1 changed files with 1 additions and 1 deletions
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2
kernel/time/tick-sched.c
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@ -570,7 +570,7 @@ void tick_setup_sched_timer(void)
/* Get the next period (per cpu) */ /* Get the next period (per cpu) */
ts->sched_timer.expires = tick_init_jiffy_update(); ts->sched_timer.expires = tick_init_jiffy_update();
offset = ktime_to_ns(tick_period) >> 1; offset = ktime_to_ns(tick_period) >> 1;
do_div(offset, NR_CPUS); do_div(offset, num_possible_cpus());
offset *= smp_processor_id(); offset *= smp_processor_id();
ts->sched_timer.expires = ktime_add_ns(ts->sched_timer.expires, offset); ts->sched_timer.expires = ktime_add_ns(ts->sched_timer.expires, offset);