From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 4 Sep 2009 15:26:26 +0000 (+0200)
Subject: perf stat: More advanced variance computation
X-Git-Tag: v2.6.32-rc1~720^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a02631a470d6f2ccec7bcf79c1058b0d4240bce;p=pandora-kernel.git

perf stat: More advanced variance computation

Use the more advanced single pass variance algorithm outlined
on the wikipedia page. This is numerically more stable for
larger sample sets.

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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