original_kernel/block
Jens Axboe aeb6fafb8f block: Add flag for telling the IO schedulers NOT to anticipate more IO
By default, CFQ will anticipate more IO from a given io context if the
previously completed IO was sync. This used to be fine, since the only
sync IO was reads and O_DIRECT writes. But with more "normal" sync writes
being used now, we don't want to anticipate for those.

Add a bio/request flag that informs the IO scheduler that this is a sync
request that we should not idle for. Introduce WRITE_ODIRECT specifically
for O_DIRECT writes, and make sure that the other sync writes set this
flag.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-06 08:04:54 -07:00
..
Kconfig
Kconfig.iosched
Makefile
as-iosched.c
blk-barrier.c
blk-core.c
blk-exec.c
blk-integrity.c
blk-ioc.c
blk-map.c
blk-merge.c
blk-settings.c
blk-softirq.c
blk-sysfs.c
blk-tag.c
blk-timeout.c
blk.h
bsg.c
cfq-iosched.c
cmd-filter.c
compat_ioctl.c
deadline-iosched.c
elevator.c
genhd.c
ioctl.c
noop-iosched.c
scsi_ioctl.c