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Jens Axboe e3ba9ae58a block: reserve some tags just for sync IO 
By only allowing async IO to consume 3/4 ths of the tag depth, we
always have slots free to serve sync IO. This is important to avoid
having writes fill the entire tag queue, thus starving reads.

Original patch and idea from Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
 		2008-10-09 08:56:19 +02:00
..
Kconfig block: Block layer data integrity support 2008-07-03 13:21:13 +02:00
Kconfig.iosched update I/O sched Kconfig help texts - CFQ is now default, not AS. 2007-02-17 20:08:22 +01:00
Makefile block: unify request timeout handling 2008-10-09 08:56:13 +02:00
as-iosched.c block: as/cfq ssd idle check update 2008-10-09 08:56:19 +02:00
blk-barrier.c block: adjust blkdev_issue_discard for swap 2008-10-09 08:56:17 +02:00
blk-core.c block: add a queue flag for request stacking support 2008-10-09 08:56:18 +02:00
blk-exec.c Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC. 2008-10-09 08:56:03 +02:00
blk-integrity.c block: implement and use {disk|part}_to_dev() 2008-10-09 08:56:07 +02:00
blk-ioc.c cfq-iosched: fix RCU race in the cfq io_context destructor handling 2008-05-07 09:28:57 +02:00
blk-map.c block: make blk_rq_map_user take a NULL user-space buffer 2008-10-09 08:56:11 +02:00
blk-merge.c block: inherit CPU completion on bio->rq and rq->rq merges 2008-10-09 08:56:09 +02:00
blk-settings.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
blk-softirq.c block: add fault injection mechanism for faking request timeouts 2008-10-09 08:56:17 +02:00
blk-sysfs.c block: add support for IO CPU affinity 2008-10-09 08:56:09 +02:00
blk-tag.c block: reserve some tags just for sync IO 2008-10-09 08:56:19 +02:00
blk-timeout.c block: use rq complete marking in blk_abort_request() 2008-10-09 08:56:17 +02:00
blk.h block: add fault injection mechanism for faking request timeouts 2008-10-09 08:56:17 +02:00
blktrace.c blktrace: simplify flags handling in __blk_add_trace 2008-10-09 08:56:01 +02:00
bsg.c block: introduce struct rq_map_data to use reserved pages 2008-10-09 08:56:10 +02:00
cfq-iosched.c block: as/cfq ssd idle check update 2008-10-09 08:56:19 +02:00
cmd-filter.c block: move holder_dir from disk to part0 2008-10-09 08:56:08 +02:00
compat_ioctl.c Add BLKDISCARD ioctl to allow userspace to discard sectors 2008-10-09 08:56:02 +02:00
deadline-iosched.c deadline-iosched: non-functional fixes 2008-10-09 08:56:03 +02:00
elevator.c block: Add interface to abort queued requests 2008-10-09 08:56:13 +02:00
genhd.c block: add fault injection mechanism for faking request timeouts 2008-10-09 08:56:17 +02:00
ioctl.c block: make partition array dynamic 2008-10-09 08:56:08 +02:00
noop-iosched.c block: let elv_register() return void 2007-12-18 08:29:28 +01:00
scsi_ioctl.c block: introduce struct rq_map_data to use reserved pages 2008-10-09 08:56:10 +02:00