]> git.baikalelectronics.ru Git - kernel.git/commit
[PATCH] use cheaper elv_queue_empty when unplug a device
authorKen Chen <kenneth.w.chen@intel.com>
Sat, 16 Apr 2005 22:25:43 +0000 (15:25 -0700)
committerLinus Torvalds <torvalds@ppc970.osdl.org>
Sat, 16 Apr 2005 22:25:43 +0000 (15:25 -0700)
commit3f7975b60f603055c8261aff39bb56389bb1903b
tree61caa8a62cf89624413e8ce8a3044bb92d42a278
parentea977366176fdbd7b2e445ff36f7d8754ee99de7
[PATCH] use cheaper elv_queue_empty when unplug a device

In function __generic_unplug_device(), kernel can use a cheaper function
elv_queue_empty() instead of more expensive elv_next_request to find
whether the queue is empty or not.  blk_run_queue can also made conditional
on whether queue's emptiness before calling request_fn().

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/block/ll_rw_blk.c