Ming Lei de14829740 blk-mq: introduce .get_budget and .put_budget in blk_mq_ops ... For SCSI devices, there is often a per-request-queue depth, which needs to be respected before queuing one request. Currently blk-mq always dequeues the request first, then calls .queue_rq() to dispatch the request to lld. One obvious issue with this approach is that I/O merging may not be successful, because when the per-request-queue depth can't be respected, .queue_rq() has to return BLK_STS_RESOURCE, and then this request has to stay in hctx->dispatch list. This means it never gets a chance to be merged with other IO. This patch introduces .get_budget and .put_budget callback in blk_mq_ops, then we can try to get reserved budget first before dequeuing request. If the budget for queueing I/O can't be satisfied, we don't need to dequeue request at all. Hence the request can be left in the IO scheduler queue, for more merging opportunities. Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2017-11-01 08:20:02 -06:00
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partitions	partitions/ldm: switch to use uuid_t	2017-06-05 16:59:14 +02:00
badblocks.c	block: Add fallthrough markers to switch statements	2017-06-21 11:46:07 -06:00
bfq-cgroup.c	bfq: Declare local functions static	2017-09-01 13:56:37 -06:00
bfq-iosched.c	block, bfq: fix unbalanced decrements of burst size	2017-10-09 09:54:58 -06:00
bfq-iosched.h	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	2017-09-07 11:59:42 -07:00
bfq-wf2q.c	block, bfq: guarantee update_next_in_service always returns an eligible entity	2017-08-31 08:20:31 -06:00
bio-integrity.c	block: remove unnecessary NULL checks in bioset_integrity_free()	2017-10-06 13:03:12 -06:00
bio.c	block: fix Sphinx kernel-doc warning	2017-10-16 13:00:12 -06:00
blk-cgroup.c	blkcg: check pol->cpd_free_fn before free cpd	2017-10-10 09:04:47 -06:00
blk-core.c	block: Fix a race between blk_cleanup_queue() and timeout handling	2017-10-30 13:28:10 -06:00
blk-exec.c	block: introduce new block status code type	2017-06-09 09:27:32 -06:00
blk-flush.c	block: update comments to reflect REQ_FLUSH -> REQ_PREFLUSH rename	2017-08-25 10:36:54 -06:00
blk-integrity.c	block: switch bios to blk_status_t	2017-06-09 09:27:32 -06:00
blk-ioc.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-03-03 10:53:35 -08:00
blk-lib.c	block: cope with WRITE ZEROES failing in blkdev_issue_zeroout()	2017-10-25 12:28:23 -06:00
blk-map.c	blk-map: call blk_queue_bounce from blk_rq_append_bio	2017-06-27 12:13:21 -06:00
blk-merge.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
blk-mq-cpumap.c	blk-mq: map queues to all present CPUs	2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c	block: remove QUEUE_FLAG_STACKABLE	2017-10-05 15:22:59 -06:00
blk-mq-debugfs.h	mq-deadline: add debugfs attributes	2017-05-04 08:25:17 -06:00
blk-mq-pci.c	blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL	2017-08-18 08:08:14 -06:00
blk-mq-rdma.c	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
blk-mq-sched.c	blk-mq: introduce .get_budget and .put_budget in blk_mq_ops	2017-11-01 08:20:02 -06:00
blk-mq-sched.h	blk-mq: introduce .get_budget and .put_budget in blk_mq_ops	2017-11-01 08:20:02 -06:00
blk-mq-sysfs.c	blk-mq: untangle debugfs and sysfs	2017-05-04 08:24:13 -06:00
blk-mq-tag.c	blk-mq: Make blk_mq_reinit_tagset() calls easier to read	2017-08-18 08:36:58 -06:00
blk-mq-tag.h	blk-mq-tag: kill unused tag enums	2017-10-01 01:26:21 -06:00
blk-mq-virtio.c	blk-mq: provide a default queue mapping for virtio device	2017-02-27 20:54:05 +02:00
blk-mq.c	blk-mq: introduce .get_budget and .put_budget in blk_mq_ops	2017-11-01 08:20:02 -06:00
blk-mq.h	blk-mq: introduce .get_budget and .put_budget in blk_mq_ops	2017-11-01 08:20:02 -06:00
blk-settings.c	block: Warn if blk_queue_rq_timed_out() is called for a blk-mq queue	2017-08-23 12:02:30 -06:00
blk-softirq.c	smp: Avoid using two cache lines for struct call_single_data	2017-08-29 15:14:38 +02:00
blk-stat.c	blk-stat: delete useless code	2017-10-10 13:48:14 -06:00
blk-stat.h	blk-stat: kill blk_stat_rq_ddir()	2017-04-21 07:56:23 -06:00
blk-sysfs.c	block: fix warning when I/O elevator is changed as request_queue is being removed	2017-08-28 10:52:44 -06:00
blk-tag.c	block: Unexport blk_queue_end_tag()	2017-08-18 08:36:58 -06:00
blk-throttle.c	blk-throttle: fix null pointer dereference while throttling writeback IOs	2017-10-10 13:09:34 -06:00
blk-timeout.c	block: Fix a race between blk_cleanup_queue() and timeout handling	2017-10-30 13:28:10 -06:00
blk-wbt.c	block,bfq: Disable writeback throttling	2017-10-09 08:29:21 -06:00
blk-wbt.h	block: Make writeback throttling defaults consistent for SQ devices	2017-04-19 08:49:03 -06:00
blk-zoned.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
blk.h	blk-mq: document the need to have STARTED and COMPLETED share a byte	2017-10-04 11:22:24 -06:00
bounce.c	block: remove the queue_bounce_pfn helper	2017-06-27 12:13:45 -06:00
bsg-lib.c	bsg-lib: don't free job in bsg_prepare_job	2017-09-25 08:56:05 -06:00
bsg.c	bsg: remove #if 0'ed code	2017-08-29 10:50:30 -06:00
cfq-iosched.c	block/cfq: cache rightmost rb_node	2017-09-08 18:26:49 -07:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	compat_hdio_ioctl: Fix a declaration	2017-08-31 17:32:41 -04:00
deadline-iosched.c	block, scheduler: convert xxx_var_store to void	2017-08-28 10:01:08 -06:00
elevator.c	elevator: allow name aliases	2017-10-25 12:36:50 -06:00
genhd.c	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	2017-09-07 11:59:42 -07:00
ioctl.c	block: move CAP_SYS_ADMIN check in blkdev_roset()	2017-10-25 12:25:00 -06:00
ioprio.c	block: Add fallthrough markers to switch statements	2017-06-21 11:46:07 -06:00
Kconfig	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
Kconfig.iosched	block, bfq: add full hierarchical scheduling and cgroups support	2017-04-19 08:30:26 -06:00
kyber-iosched.c	block: kyber: check if there are requests in ctx in kyber_has_work()	2017-11-01 08:20:02 -06:00
Makefile	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
mq-deadline.c	mq-deadline: add 'deadline' as a name alias	2017-10-25 12:36:55 -06:00
noop-iosched.c	block: move existing elevator ops to union	2017-01-17 10:03:33 -07:00
opal_proto.h	block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled	2017-09-11 09:45:52 -06:00
partition-generic.c	block: fix a crash caused by wrong API	2017-09-25 08:56:05 -06:00
scsi_ioctl.c	block: Change argument type of scsi_req_init()	2017-06-20 19:27:14 -06:00
sed-opal.c	block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled	2017-09-11 09:45:52 -06:00
t10-pi.c	t10-pi: Move opencoded contants to common header	2017-07-03 16:56:25 -06:00