From: Bruno Randolf <br1@einfach.org>
Date: Thu, 2 Dec 2010 10:50:37 +0000 (+0900)
Subject: lib: Improve EWMA efficiency by using bitshifts
X-Git-Tag: v2.6.38-rc1~476^2~169^2^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af5568843594fb71055debe36e521fa8072fcecc;p=pandora-kernel.git

lib: Improve EWMA efficiency by using bitshifts

Using bitshifts instead of division and multiplication should improve
performance. That requires weight and factor to be powers of two, but i think
this is something we can live with.

Thanks to Peter Zijlstra for the improved formula!

Signed-off-by: Bruno Randolf <br1@einfach.org>

--

v2:	use log2.h functions
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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