From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 4 Sep 2009 13:36:12 +0000 (+0200)
Subject: perf stat: Change noise calculation to use stddev
X-Git-Tag: v2.6.32-rc1~720^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=506d4bc8d5dab20d84624aa07cdc6dcd77915d52;p=pandora-kernel.git

perf stat: Change noise calculation to use stddev

The current noise computation does:

 \Sum abs(n_i - avg(n)) * N^-1.5

Which is (afaik) not a regular noise function, and needs the
complete sample set available to post-process.

Change this to use a regular stddev computation which can be
done by keeping a two sums:

 stddev = sqrt( 1/N (\Sum n_i^2) - avg(n)^2 )

For which we only need to keep \Sum n_i and \Sum n_i^2.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

Reading git-diff-tree failed