From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 16 Apr 2010 12:59:29 +0000 (+0200)
Subject: sched: Pre-compute cpumask_weight(sched_domain_span(sd))
X-Git-Tag: v2.6.35-rc1~521^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=669c55e9f99b90e46eaa0f98a67ec53d46dc969a;p=pandora-kernel.git

sched: Pre-compute cpumask_weight(sched_domain_span(sd))

Dave reported that his large SPARC machines spend lots of time in
hweight64(), try and optimize some of those needless cpumask_weight()
invocations (esp. with the large offstack cpumasks these are very
expensive indeed).

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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