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8f5fea65b0
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David Jeffery 8f5fea65b0 blk-mq: avoid extending delays of active hctx from blk_mq_delay_run_hw_queues 
When blk_mq_delay_run_hw_queues sets an hctx to run in the future, it can
reset the delay length for an already pending delayed work run_work. This
creates a scenario where multiple hctx may have their queues set to run,
but if one runs first and finds nothing to do, it can reset the delay of
another hctx and stall the other hctx's ability to run requests.

To avoid this I/O stall when an hctx's run_work is already pending,
leave it untouched to run at its current designated time rather than
extending its delay. The work will still run which keeps closed the race
calling blk_mq_delay_run_hw_queues is needed for while also avoiding the
I/O stall.

Signed-off-by: David Jeffery <djeffery@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220131203337.GA17666@redhat
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-02-16 19:46:20 -07:00
..
partitions block: remove genhd.h 2022-02-02 07:49:59 -07:00
badblocks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bdev.c block: deprecate autoloading based on dev_t 2022-02-02 07:49:58 -07:00
bfq-cgroup.c block, bfq: fix UAF problem in bfqg_stats_init() 2021-10-19 15:18:30 -06:00
bfq-iosched.c block: simplify ioc_lookup_icq 2021-11-29 06:41:29 -07:00
bfq-iosched.h block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
bfq-wf2q.c block: Introduce IOPRIO_NR_LEVELS 2021-08-18 07:21:12 -06:00
bio-integrity.c block: clone crypto and integrity data in __bio_clone_fast 2022-02-04 07:43:18 -07:00
bio.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-cgroup-rwstat.c blk-cgroup: Fix the recursive blkg rwstat 2021-03-05 11:32:15 -07:00
blk-cgroup-rwstat.h block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-cgroup.c blk-cgroup: set blkg iostat after percpu stat aggregation 2022-02-15 14:13:12 -07:00
blk-cgroup.h block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-core.c block: merge submit_bio_checks() into submit_bio_noacct 2022-02-16 19:42:28 -07:00
blk-crypto-fallback.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-crypto-internal.h block: move struct request to blk-mq.h 2021-10-18 06:17:02 -06:00
blk-crypto-profile.c blk-crypto: remove blk_crypto_unregister() 2021-11-29 06:38:51 -07:00
blk-crypto.c block: clone crypto and integrity data in __bio_clone_fast 2022-02-04 07:43:18 -07:00
blk-flush.c block: pass a block_device and opf to bio_init 2022-02-02 07:49:59 -07:00
blk-ia-ranges.c block: fix memory leak in disk_register_independent_access_ranges 2022-01-23 09:13:09 -07:00
blk-integrity.c blk-crypto: remove blk_crypto_unregister() 2021-11-29 06:38:51 -07:00
blk-ioc.c block: drop needless assignment in set_task_ioprio() 2021-12-23 07:10:07 -07:00
blk-iocost.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-iolatency.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-ioprio.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-ioprio.h block: Introduce the ioprio rq-qos policy 2021-06-21 15:03:40 -06:00
blk-lib.c blk-lib: don't check bdev_get_queue() NULL check 2022-02-15 07:51:46 -07:00
blk-map.c Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
blk-merge.c block: throttle split bio in case of iops limit 2022-02-16 19:42:28 -07:00
blk-mq-cpumap.c blk-mq: remove the calling of local_memory_node() 2020-10-20 07:08:17 -06:00
blk-mq-debugfs-zoned.c
blk-mq-debugfs.c blk-mq: check q->poll_stat in queue_poll_stat_show 2021-12-02 08:20:49 -07:00
blk-mq-debugfs.h
blk-mq-pci.c
blk-mq-rdma.c
blk-mq-sched.c blk-mq: run dispatch lock once in case of issuing from list 2021-12-03 14:51:29 -07:00
blk-mq-sched.h block: move blk_mq_sched_assign_ioc to blk-ioc.c 2021-11-29 06:41:29 -07:00
blk-mq-sysfs.c blk-mq: move srcu from blk_mq_hw_ctx to request_queue 2021-12-03 14:51:29 -07:00
blk-mq-tag.c sbitmap: Delete old sbitmap_queue_get_shallow() 2022-02-08 06:55:49 -07:00
blk-mq-tag.h blk-mq: Delete busy_iter_fn 2021-12-06 13:18:47 -07:00
blk-mq-virtio.c
blk-mq.c blk-mq: avoid extending delays of active hctx from blk_mq_delay_run_hw_queues 2022-02-16 19:46:20 -07:00
blk-mq.h blk-mq: don't run might_sleep() if the operation needn't blocking 2021-12-06 09:40:42 -07:00
blk-pm.c scsi: block: pm: Always set request queue runtime active in blk_post_runtime_resume() 2021-12-22 23:38:29 -05:00
blk-pm.h block: Remove unused blk_pm_*() function definitions 2021-02-22 06:33:48 -07:00
blk-rq-qos.c rq-qos: fix missed wake-ups in rq_qos_throttle try two 2021-06-08 15:12:57 -06:00
blk-rq-qos.h block: only mark bio as tracked if it really is tracked 2021-10-18 08:50:47 -06:00
blk-settings.c block: Fix partition check for host-aware zoned block devices 2021-10-27 06:58:01 -06:00
blk-stat.c block: make queue stat accounting a reference 2021-12-14 17:23:05 -07:00
blk-stat.h block: make queue stat accounting a reference 2021-12-14 17:23:05 -07:00
blk-sysfs.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
blk-throttle.c block: revert 4f1e9630af ("blk-throtl: optimize IOPS throttle for large IO scenarios") 2022-02-16 19:42:28 -07:00
blk-throttle.h block: revert 4f1e9630af ("blk-throtl: optimize IOPS throttle for large IO scenarios") 2022-02-16 19:42:28 -07:00
blk-timeout.c block: blk-timeout: delete duplicated word 2020-07-31 16:29:47 -06:00
blk-wbt.c blk-wbt: prevent NULL pointer dereference in wb_timer_fn 2021-10-19 06:13:41 -06:00
blk-wbt.h blk-wbt: introduce a new disable state to prevent false positive by rwb_enabled() 2021-06-21 15:03:41 -06:00
blk-zoned.c block: pass a block_device and opf to bio_init 2022-02-02 07:49:59 -07:00
blk.h block: don't check bio in blk_throtl_dispatch_work_fn 2022-02-16 19:42:28 -07:00
bounce.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
bsg-lib.c block: remove the gendisk argument to blk_execute_rq 2021-11-29 06:41:29 -07:00
bsg.c scsi: bsg: Fix device unregistration 2021-09-14 00:22:15 -04:00
disk-events.c block: remove genhd.h 2022-02-02 07:49:59 -07:00
elevator.c block: partition include/linux/blk-cgroup.h 2022-02-11 10:02:41 -07:00
elevator.h block: move elevator.h to block/ 2021-10-18 06:17:01 -06:00
fops.c block: pass a block_device and opf to bio_init 2022-02-02 07:49:59 -07:00
genhd.c block: add a ->free_disk method 2022-02-16 19:44:24 -07:00
holder.c block: remove genhd.h 2022-02-02 07:49:59 -07:00
ioctl.c block: merge disk_scan_partitions and blkdev_reread_part 2021-11-29 06:35:21 -07:00
ioprio.c for-5.17/block-2022-01-11 2022-01-12 10:26:52 -08:00
Kconfig blk-mq: make the blk-mq stacking code optional 2022-02-16 19:39:09 -07:00
Kconfig.iosched block: only build the icq tracking code when needed 2021-12-16 10:59:02 -07:00
kyber-iosched.c block: make queue stat accounting a reference 2021-12-14 17:23:05 -07:00
Makefile block: remove blk-exec.c 2021-11-29 06:34:50 -07:00
mq-deadline.c block: fix async_depth sysfs interface for mq-deadline 2022-01-20 10:54:02 -07:00
opal_proto.h
sed-opal.c block: remove genhd.h 2022-02-02 07:49:59 -07:00
t10-pi.c block: move integrity handling out of <linux/blkdev.h> 2021-10-18 06:17:02 -06:00