Omar Sandoval da55f2cc78 blk-mq: use sbq wait queues instead of restart for driver tags ... Commit 50e1dab86a ("blk-mq-sched: fix starvation for multiple hardware queues and shared tags") fixed one starvation issue for shared tags. However, we can still get into a situation where we fail to allocate a tag because all tags are allocated but we don't have any pending requests on any hardware queue. One solution for this would be to restart all queues that share a tag map, but that really sucks. Ideally, we could just block and wait for a tag, but that isn't always possible from blk_mq_dispatch_rq_list(). However, we can still use the struct sbitmap_queue wait queues with a custom callback instead of blocking. This has a few benefits: 1. It avoids iterating over all hardware queues when completing an I/O, which the current restart code has to do. 2. It benefits from the existing rolling wakeup code. 3. It avoids punting to another thread just to have it block. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>		2017-02-23 11:55:46 -07:00
..
partitions	partitions/efi: Fix integer overflow in GPT size calculation	2017-01-17 09:02:31 -07:00
badblocks.c	badblocks: badblocks_set/clear update unacked_exist	2016-10-21 15:45:47 -06:00
bio-integrity.c	block: remove bio_is_rw	2016-10-28 08:45:17 -06:00
bio.c	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
blk-cgroup.c	blkcg: fix double free of new_blkg in blkcg_init_queue	2017-02-03 07:52:35 -07:00
blk-core.c	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
blk-exec.c	block: introduce blk_rq_is_passthrough	2017-01-31 14:00:34 -07:00
blk-flush.c	block: don't defer flushes on blk-mq + scheduling	2017-02-17 12:35:47 -07:00
blk-integrity.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
blk-ioc.c	blk-mq-sched: don't hold queue_lock when calling exit_icq	2017-02-10 11:34:47 -07:00
blk-lib.c	block: don't try Write Same from __blkdev_issue_zeroout	2017-02-06 09:34:46 -07:00
blk-map.c	block: fold cmd_type into the REQ_OP_ space	2017-01-31 14:00:44 -07:00
blk-merge.c	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
blk-mq-cpumap.c	blk-mq: export blk_mq_map_queues	2016-11-08 17:30:00 -05:00
blk-mq-debugfs.c	block: use same block debugfs directory for blk-mq and blktrace	2017-02-02 10:20:16 -07:00
blk-mq-pci.c	blk_mq: linux/blk-mq.h does not include all the headers it depends on	2016-09-19 08:21:51 -06:00
blk-mq-sched.c	block: get rid of blk-mq default scheduler choice Kconfig entries	2017-02-22 13:19:45 -07:00
blk-mq-sched.h	blk-mq: pass bio to blk_mq_sched_get_rq_priv	2017-02-10 09:09:59 -07:00
blk-mq-sysfs.c	blk-mq: move debugfs_remove() of disk dir to blk_release_queue()	2017-02-02 10:20:16 -07:00
blk-mq-tag.c	blk-mq-sched: add flush insertion into blk_mq_sched_insert_request()	2017-01-27 09:03:14 -07:00
blk-mq-tag.h	blk-mq: move tags and sched_tags info from sysfs to debugfs	2017-01-27 08:17:44 -07:00
blk-mq.c	blk-mq: use sbq wait queues instead of restart for driver tags	2017-02-23 11:55:46 -07:00
blk-mq.h	block: use same block debugfs directory for blk-mq and blktrace	2017-02-02 10:20:16 -07:00
blk-settings.c	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
blk-softirq.c	This adds a new gcc plugin named "latent_entropy". It is designed to	2016-10-15 10:03:15 -07:00
blk-stat.c	blk-stat: fix a few cases of missing batch flushing	2016-12-09 13:08:35 -07:00
blk-stat.h	block: add scalable completion tracking of requests	2016-11-10 13:53:26 -07:00
blk-sysfs.c	block: do not allow updates through sysfs until registration completes	2017-02-15 08:40:04 -07:00
blk-tag.c	blk-mq-sched: add framework for MQ capable IO schedulers	2017-01-17 10:04:20 -07:00
blk-throttle.c	blk-throttle: Adjust two function calls together with a variable assignment	2017-01-23 08:32:15 -07:00
blk-timeout.c
blk-wbt.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
blk-wbt.h	blk-wbt: allow wbt to be enabled always through sysfs	2016-11-28 10:27:03 -07:00
blk-zoned.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
blk.h	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
bounce.c
bsg-lib.c	block: split scsi_request out of struct request	2017-01-27 15:08:35 -07:00
bsg.c	block: fold cmd_type into the REQ_OP_ space	2017-01-31 14:00:44 -07:00
cfq-iosched.c	for-4.11/linus-merge-signed	2017-02-21 10:57:33 -08:00
cmdline-parser.c
compat_ioctl.c	block: Get rid of blk_get_backing_dev_info()	2017-02-02 08:21:32 -07:00
deadline-iosched.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
elevator.c	block: get rid of blk-mq default scheduler choice Kconfig entries	2017-02-22 13:19:45 -07:00
genhd.c	block: Unhash also block device inode for the whole device	2017-02-21 12:51:54 -07:00
ioctl.c	block: Get rid of blk_get_backing_dev_info()	2017-02-02 08:21:32 -07:00
ioprio.c	block: fix use-after-free in sys_ioprio_get()	2016-07-01 08:39:24 -06:00
Kconfig	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
Kconfig.iosched	block: get rid of blk-mq default scheduler choice Kconfig entries	2017-02-22 13:19:45 -07:00
Makefile	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
mq-deadline.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
noop-iosched.c	block: move existing elevator ops to union	2017-01-17 10:03:33 -07:00
opal_proto.h	block/sed-opal: allocate struct opal_dev dynamically	2017-02-17 12:41:47 -07:00
partition-generic.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
scsi_ioctl.c	block: fold cmd_type into the REQ_OP_ space	2017-01-31 14:00:44 -07:00
sed-opal.c	block/sed-opal: Propagate original error message to userland.	2017-02-23 11:55:44 -07:00
t10-pi.c