Alan D. Brunelle ac9fafa124 block: Skip I/O merges when disabled ... The block I/O + elevator + I/O scheduler code spend a lot of time trying to merge I/Os -- rightfully so under "normal" circumstances. However, if one were to know that the incoming I/O stream was /very/ random in nature, the cycles are wasted. This patch adds a per-request_queue tunable that (when set) disables merge attempts (beyond the simple one-hit cache check), thus freeing up a non-trivial amount of CPU cycles. Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2008-04-29 14:48:55 +02:00
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as-iosched.c
blk-barrier.c	block: rename and export rq_init()	2008-04-29 14:48:55 +02:00
blk-core.c	block: add large command support	2008-04-29 14:48:55 +02:00
blk-exec.c
blk-ioc.c
blk-map.c	block: add dma alignment and padding support to blk_rq_map_kern	2008-04-29 09:50:34 +02:00
blk-merge.c	block: make queue flags non-atomic	2008-04-29 14:48:33 +02:00
blk-settings.c	block: make queue flags non-atomic	2008-04-29 14:48:33 +02:00
blk-sysfs.c	block: Skip I/O merges when disabled	2008-04-29 14:48:55 +02:00
blk-tag.c	block: make queue flags non-atomic	2008-04-29 14:48:33 +02:00
blk.h	block: rename and export rq_init()	2008-04-29 14:48:55 +02:00
blktrace.c
bsg.c
cfq-iosched.c
compat_ioctl.c
deadline-iosched.c
elevator.c	block: Skip I/O merges when disabled	2008-04-29 14:48:55 +02:00
genhd.c
ioctl.c
Kconfig
Kconfig.iosched
Makefile
noop-iosched.c
scsi_ioctl.c	block: no need to initialize rq->cmd with blk_get_request	2008-04-29 14:48:55 +02:00