tree f16f440237e5627bda317923198fbbe00cb22e96
parent e2d74ac0664c89757bde8fb18c98cd7bf53da61c
author Andreas Mohr <andi@lisas.de> 1143529189 +0200
committer Jens Axboe <axboe@suse.de> 1143529189 +0200

[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>