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authorAndreas Mohr <andi@lisas.de>2006-03-28 01:59:49 -0500
committerJens Axboe <axboe@suse.de>2006-03-28 01:59:49 -0500
commite8a99053ea82a4b4375049886cf1db64d7dcd755 (patch)
treef16f440237e5627bda317923198fbbe00cb22e96 /block/scsi_ioctl.c
parente2d74ac0664c89757bde8fb18c98cd7bf53da61c (diff)
[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/scsi_ioctl.c')
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