]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] cfq-iosched: small cfq_choose_req() optimization
authorAndreas Mohr <andi@lisas.de>
Tue, 28 Mar 2006 06:59:49 +0000 (08:59 +0200)
committerJens Axboe <axboe@suse.de>
Tue, 28 Mar 2006 06:59:49 +0000 (08:59 +0200)
commite8a99053ea82a4b4375049886cf1db64d7dcd755
treef16f440237e5627bda317923198fbbe00cb22e96
parente2d74ac0664c89757bde8fb18c98cd7bf53da61c
[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>
block/cfq-iosched.c