John Garry d97e594c51 blk-mq: Use request queue-wide tags for tagset-wide sbitmap ... The tags used for an IO scheduler are currently per hctx. As such, when q->nr_hw_queues grows, so does the request queue total IO scheduler tag depth. This may cause problems for SCSI MQ HBAs whose total driver depth is fixed. Ming and Yanhui report higher CPU usage and lower throughput in scenarios where the fixed total driver tag depth is appreciably lower than the total scheduler tag depth: https://lore.kernel.org/linux-block/440dfcfc-1a2c-bd98-1161-cec4d78c6dfc@huawei.com/T/#mc0d6d4f95275a2743d1c8c3e4dc9ff6c9aa3a76b In that scenario, since the scheduler tag is got first, much contention is introduced since a driver tag may not be available after we have got the sched tag. Improve this scenario by introducing request queue-wide tags for when a tagset-wide sbitmap is used. The static sched requests are still allocated per hctx, as requests are initialised per hctx, as in blk_mq_init_request(..., hctx_idx, ...) -> set->ops->init_request(.., hctx_idx, ...). For simplicity of resizing the request queue sbitmap when updating the request queue depth, just init at the max possible size, so we don't need to deal with the possibly with swapping out a new sbitmap for old if we need to grow. Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/1620907258-30910-3-git-send-email-john.garry@huawei.com Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-05-24 06:47:22 -06:00
..
partitions	block/partitions/efi.c: Fix the efi_partition() kernel-doc header	2021-05-14 09:00:06 -06:00
Kconfig	blk-wbt: Remove obsolete multiqueue I/O scheduling comment	2020-09-01 16:49:26 -06:00
Kconfig.iosched	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	blk-mq: merge blk-softirq.c into blk-mq.c	2020-06-24 09:15:56 -06:00
badblocks.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
bfq-cgroup.c	block, bfq: merge bursts of newly-created queues	2021-03-25 10:50:07 -06:00
bfq-iosched.c	block, bfq: avoid circular stable merges	2021-05-12 07:39:23 -06:00
bfq-iosched.h	block, bfq: merge bursts of newly-created queues	2021-03-25 10:50:07 -06:00
bfq-wf2q.c	block, bfq: always inject I/O of queues blocked by wakers	2021-03-25 10:50:07 -06:00
bio-integrity.c	block: remove BLK_BOUNCE_ISA support	2021-04-06 09:28:17 -06:00
bio.c	Revert "bio: limit bio max size"	2021-05-08 21:49:48 -06:00
blk-cgroup-rwstat.c	blk-cgroup: Fix the recursive blkg rwstat	2021-03-05 11:32:15 -07:00
blk-cgroup-rwstat.h	blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT	2019-11-07 12:28:13 -07:00
blk-cgroup.c	blkcg: drop CLONE_IO check in blkcg_can_attach()	2021-05-24 06:47:21 -06:00
blk-core.c	block_dump: remove block_dump feature	2021-05-24 06:47:21 -06:00
blk-crypto-fallback.c	block: rename BIO_MAX_PAGES to BIO_MAX_VECS	2021-03-11 07:47:48 -07:00
blk-crypto-internal.h	block: make blk_crypto_rq_bio_prep() able to fail	2020-10-05 10:47:43 -06:00
blk-crypto.c	dm: support key eviction from keyslot managers of underlying devices	2021-02-11 09:45:25 -05:00
blk-exec.c	block: drop removed argument from kernel-doc of blk_execute_rq()	2021-01-29 07:43:29 -07:00
blk-flush.c	block: avoid double io accounting for flush request	2021-05-24 06:47:21 -06:00
blk-integrity.c	block: remove the unused blk_integrity_merge_bio export	2020-10-06 07:29:53 -06:00
blk-ioc.c	block: remove retry loop in ioc_release_fn()	2020-07-16 10:22:15 -06:00
blk-iocost.c	blk-iocost: fix weight updates of inner active iocgs	2021-05-11 20:50:35 -06:00
blk-iolatency.c	block: Remove redundant 'return' statement	2020-10-08 07:59:48 -06:00
blk-lib.c	block: rename BIO_MAX_PAGES to BIO_MAX_VECS	2021-03-11 07:47:48 -07:00
blk-map.c	block: remove an incorrect check from blk_rq_append_bio	2021-04-12 06:45:12 -06:00
blk-merge.c	block: recalculate segment count for multi-segment discards correctly	2021-03-23 10:39:57 -06:00
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	block: Cleanup license notice	2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c	for-5.13/block-2021-04-27	2021-04-28 14:27:12 -07:00
blk-mq-debugfs.h	blk-mq: no need to check return value of debugfs_create functions	2019-06-13 03:00:30 -06:00
blk-mq-pci.c	block: Fix blk_mq_*_map_queues() kernel-doc headers	2019-05-31 15:12:34 -06:00
blk-mq-rdma.c	block: Fix blk_mq_*_map_queues() kernel-doc headers	2019-05-31 15:12:34 -06:00
blk-mq-sched.c	blk-mq: Use request queue-wide tags for tagset-wide sbitmap	2021-05-24 06:47:22 -06:00
blk-mq-sched.h	blk-mq: Use request queue-wide tags for tagset-wide sbitmap	2021-05-24 06:47:22 -06:00
blk-mq-sysfs.c	blk-mq: move cancel of hctx->run_work to the front of blk_exit_queue	2020-10-09 12:46:28 -06:00
blk-mq-tag.c	blk-mq: Use request queue-wide tags for tagset-wide sbitmap	2021-05-24 06:47:22 -06:00
blk-mq-tag.h	blk-mq: Some tag allocation code refactoring	2021-05-24 06:47:22 -06:00
blk-mq-virtio.c	blk-mq: Fix typo in comment	2020-03-17 20:55:21 +01:00
blk-mq.c	blk-mq: Use request queue-wide tags for tagset-wide sbitmap	2021-05-24 06:47:22 -06:00
blk-mq.h	blk-mq: grab rq->refcount before calling ->fn in blk_mq_tagset_busy_iter	2021-05-24 06:47:22 -06:00
blk-pm.c	scsi: block: Fix a race in the runtime power management code	2020-12-09 11:41:41 -05:00
blk-pm.h	block: Remove unused blk_pm_*() function definitions	2021-02-22 06:33:48 -07:00
blk-rq-qos.c	Revert "blk-rq-qos: remove redundant finish_wait to rq_qos_wait."	2020-07-15 09:33:37 -06:00
blk-rq-qos.h	blk-rq-qos: fix first node deletion of rq_qos_del()	2019-10-15 10:13:13 -06:00
blk-settings.c	block-5.13-2021-05-09	2021-05-09 13:25:14 -07:00
blk-stat.c	blk-stat: make q->stats->lock irqsafe	2020-09-01 16:48:46 -06:00
blk-stat.h	block: deactivate blk_stat timer in wbt_disable_default()	2018-12-12 06:47:51 -07:00
blk-sysfs.c	block: remove unneeded parenthesis from blk-sysfs	2021-05-24 06:47:21 -06:00
blk-throttle.c	block: store a block_device pointer in struct bio	2021-01-24 18:17:20 -07:00
blk-timeout.c	block: blk-timeout: delete duplicated word	2020-07-31 16:29:47 -06:00
blk-wbt.c	blk: wbt: remove unused parameter from wbt_should_throttle	2021-01-26 13:13:00 -07:00
blk-wbt.h	blk-wbt: remove wbt_update_limits	2020-05-29 16:30:39 -06:00
blk-zoned.c	blk-zoned: Remove the definition of blk_zone_start()	2021-04-07 14:31:45 -06:00
blk.h	block: refactor blk_drop_partitions	2021-04-08 10:24:36 -06:00
bounce.c	block: stop calling blk_queue_bounce for passthrough requests	2021-04-06 09:28:18 -06:00
bsg-lib.c	block: drop double zeroing	2020-09-23 09:18:13 -06:00
bsg.c	block: remove unnecessary argument from blk_execute_rq	2021-01-24 21:52:39 -07:00
cmdline-parser.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
elevator.c	blk-mq: set default elevator as deadline in case of hctx shared tagset	2021-04-07 10:15:23 -06:00
genhd.c	block: prevent block device lookups at the beginning of del_gendisk	2021-05-20 07:59:35 -06:00
ioctl.c	block: return -EBUSY when there are open partitions in blkdev_reread_part	2021-04-21 10:49:37 -06:00
ioprio.c	block: Fix sys_ioprio_set(.which=IOPRIO_WHO_PGRP) task iteration	2021-04-08 13:43:53 -06:00
keyslot-manager.c	- Fix DM integrity's HMAC support to provide enhanced security of	2021-02-22 10:22:54 -08:00
kyber-iosched.c	kyber: fix out of bounds access when preempted	2021-05-11 08:12:14 -06:00
mq-deadline.c	kyber: fix out of bounds access when preempted	2021-05-11 08:12:14 -06:00
opal_proto.h	block: sed-opal: Change the check condition for regular session validity	2020-03-12 08:00:10 -06:00
scsi_ioctl.c	block: Remove an obsolete comment from sg_io()	2021-04-13 11:23:52 -06:00
sed-opal.c	block: sed-opal: Change the check condition for regular session validity	2020-03-12 08:00:10 -06:00
t10-pi.c	block: Allow t10-pi to be modular	2020-01-06 20:59:04 -07:00