tree ad2705044b5b781aeb1a119d9c8548a044c7e21f
parent 3075d9da0b4ccc88959db30de80ebd11d2dde175
author john stultz <johnstul@us.ibm.com> 1192602438 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1192635773 -0700

Use num_possible_cpus() instead of NR_CPUS for timer distribution

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>