From: john stultz <johnstul@us.ibm.com>
Date: Wed, 17 Oct 2007 06:27:18 +0000 (-0700)
Subject: Use num_possible_cpus() instead of NR_CPUS for timer distribution
X-Git-Tag: v2.6.24-rc1~679
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2d9323d139f5c384fa1ef1d74773b4db1c09b3d;p=pandora-kernel.git

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>
---

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