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| author | Andreas Mohr <andi@lisas.de> | 2006-03-28 08:59:49 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2006-03-28 08:59:49 +0200 |
| commit | e8a99053ea82a4b4375049886cf1db64d7dcd755 (patch) | |
| tree | f16f440237e5627bda317923198fbbe00cb22e96 /block/ll_rw_blk.c | |
| parent | e2d74ac0664c89757bde8fb18c98cd7bf53da61c (diff) | |
| download | op-kernel-dev-e8a99053ea82a4b4375049886cf1db64d7dcd755.zip op-kernel-dev-e8a99053ea82a4b4375049886cf1db64d7dcd755.tar.gz | |
[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>
Diffstat (limited to 'block/ll_rw_blk.c')
0 files changed, 0 insertions, 0 deletions
