From: Andreas Mohr <andi@lisas.de>
Date: Tue, 28 Mar 2006 06:59:49 +0000 (+0200)
Subject: [PATCH] cfq-iosched: small cfq_choose_req() optimization
X-Git-Tag: v2.6.17-rc1~208^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8a99053ea82a4b4375049886cf1db64d7dcd755;p=pandora-kernel.git

[PATCH] cfq-iosched: small cfq_choose_req() optimization

this is a small optimization to cfq_choose_req() in the CFQ I/O scheduler
(this function is a semi-often invoked candidate in an oprofile log):
by using a bit mask variable, we can use a simple switch() to check
the various cases instead of having to query two variables for each check.
Benefit: 251 vs. 285 bytes footprint of cfq_choose_req().
Also, common case 0 (no request wrapping) is now checked first in code.

Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Jens Axboe <axboe@suse.de>
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