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linux/drivers/md
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Benjamin Marzinski 33304b75df dm-delay: don't busy-wait in kthread 
When using a kthread to delay the IOs, dm-delay would continuously loop,
checking if IOs were ready to submit. It had a cond_resched() call in
the loop, but might still loop hundreds of millions of times waiting for
an IO that was scheduled to be submitted 10s of ms in the future. With
the change to make dm-delay over zoned devices always use kthreads
regardless of the length of the delay, this wasted work only gets worse.

To solve this and still keep roughly the same precision for very short
delays, dm-delay now calls fsleep() for 1/8th of the smallest non-zero
delay it will place on IOs, or 1 ms, whichever is smaller. The reason
that dm-delay doesn't just use the actual expiration time of the next
delayed IO to calculated the sleep time is that delay_dtr() must wait
for the kthread to finish before deleting the table. If a zoned device
with a long delay queued an IO shortly before being suspended and
removed, the IO would be flushed in delay_presuspend(), but the removing
the device would still have to wait for the remainder of the long delay.
This time is now capped at 1 ms.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
History 2025-05-04 11:35:05 +02:00
..
bcache treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-vdo treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
persistent-data - fix a spelling error in dm-raid 2025-01-27 17:06:42 -08:00
dm-audit.c dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-audit.h dm: introduce audit event module for device mapper 2021-10-27 16:53:47 -04:00
dm-bio-prison-v1.c dm cache: Remove unused functions in bio-prison-v1 2024-11-20 11:38:04 +01:00
dm-bio-prison-v1.h dm cache: Remove unused functions in bio-prison-v1 2024-11-20 11:38:04 +01:00
dm-bio-prison-v2.c dm: use bio_list_merge_init 2024-04-01 11:53:37 -06:00
dm-bio-prison-v2.h dm: change "unsigned" to "unsigned int" 2023-02-14 14:23:06 -05:00
dm-bio-record.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-bufio.c dm-bufio: remove unused return value 2025-02-24 11:42:23 +01:00
dm-builtin.c dm: adjust EXPORT_SYMBOL() to follow functions immediately 2023-02-14 14:23:07 -05:00
dm-cache-background-tracker.c dm cache: Remove unused btracker_nr_writebacks_queued 2024-11-20 11:38:04 +01:00
dm-cache-background-tracker.h dm cache: Remove unused btracker_nr_writebacks_queued 2024-11-20 11:38:04 +01:00
dm-cache-block-types.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-cache-metadata.c dm cache: Remove unused dm_cache_size 2024-11-20 11:38:04 +01:00
dm-cache-metadata.h dm cache: Remove unused dm_cache_size 2024-11-20 11:38:04 +01:00
dm-cache-policy-internal.h dm: add missing empty lines 2023-02-14 14:23:06 -05:00
dm-cache-policy-smq.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-cache-policy.c dm: change "unsigned" to "unsigned int" 2023-02-14 14:23:06 -05:00
dm-cache-policy.h dm: address indent/space issues 2023-02-14 14:23:06 -05:00
dm-cache-target.c dm cache: support shrinking the origin device 2025-03-06 16:13:47 +01:00
dm-clone-metadata.c dm: Make use of __assign_bit() API 2024-09-02 16:53:53 +02:00
dm-clone-metadata.h dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-target.c block: add a bdev_limits helper 2024-10-29 09:15:00 -06:00
dm-core.h dm: fix dm_blk_report_zones 2025-05-04 11:34:56 +02:00
dm-crypt.c dm-crypt: switch to using the crc32 library 2025-02-03 14:10:10 +01:00
dm-delay.c dm-delay: don't busy-wait in kthread 2025-05-04 11:35:05 +02:00
dm-dust.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-ebs-target.c dm-ebs: fix prefetch-vs-suspend race 2025-03-28 18:26:11 +01:00
dm-era-target.c dm: Constify struct dm_block_validator 2024-07-19 12:08:15 +02:00
dm-exception-store.c dm: change "unsigned" to "unsigned int" 2023-02-14 14:23:06 -05:00
dm-exception-store.h dm: avoid spaces before function arguments or in favour of tabs 2023-02-14 14:23:06 -05:00
dm-flakey.c dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature 2025-03-13 18:54:11 +01:00
dm-ima.c dm: avoid inline filenames 2023-02-14 14:23:07 -05:00
dm-ima.h dm: avoid inline filenames 2023-02-14 14:23:07 -05:00
dm-init.c dm init: Handle minors larger than 255 2024-07-02 20:53:41 +02:00
dm-integrity.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-io-rewind.c dm: avoid void function return statements 2023-02-14 14:23:07 -05:00
dm-io-tracker.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-io.c dm-io: Warn on creating multiple atomic write bios for a region 2025-01-17 22:24:09 +01:00
dm-ioctl.c dm ioctl: rate limit a couple of ioctl based error messages 2024-11-20 11:38:04 +01:00
dm-kcopyd.c dm io: Support IO priority 2024-02-20 14:22:51 -05:00
dm-linear.c dm-linear: Enable atomic writes 2025-01-17 22:24:04 +01:00
dm-log-userspace-base.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-log-userspace-transfer.c dm: avoid split of quoted strings where possible 2023-02-14 14:23:07 -05:00
dm-log-userspace-transfer.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-log-writes.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-log.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-mpath.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-mpath.h dm: change "unsigned" to "unsigned int" 2023-02-14 14:23:06 -05:00
dm-path-selector.c dm: adjust EXPORT_SYMBOL() to follow functions immediately 2023-02-14 14:23:07 -05:00
dm-path-selector.h dm: avoid spaces before function arguments or in favour of tabs 2023-02-14 14:23:06 -05:00
dm-ps-historical-service-time.c dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-ps-io-affinity.c dm: change kzalloc to kcalloc 2025-01-17 22:05:39 +01:00
dm-ps-queue-length.c dm: avoid spaces before function arguments or in favour of tabs 2023-02-14 14:23:06 -05:00
dm-ps-round-robin.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-ps-service-time.c dm: avoid spaces before function arguments or in favour of tabs 2023-02-14 14:23:06 -05:00
dm-raid.c dm raid: fix spelling errors in raid_ctr() 2025-01-17 22:05:39 +01:00
dm-raid1.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-region-hash.c dm: update relevant MODULE_AUTHOR entries to latest dm-devel mailing list 2024-02-20 14:22:55 -05:00
dm-rq.c block: remove BLK_MQ_F_SHOULD_MERGE 2024-12-23 08:17:23 -07:00
dm-rq.h dm: change "unsigned" to "unsigned int" 2023-02-14 14:23:06 -05:00
dm-snap-persistent.c dm io: Support IO priority 2024-02-20 14:22:51 -05:00
dm-snap-transient.c dm: avoid split of quoted strings where possible 2023-02-14 14:23:07 -05:00
dm-snap.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-stats.c dm stats: limit the number of entries 2024-01-30 14:06:44 -05:00
dm-stats.h dm stats: check for and propagate alloc_percpu failure 2023-03-16 13:37:06 -04:00
dm-stripe.c dm: Enable inline crypto passthrough for striped target 2025-02-17 11:48:32 +01:00
dm-switch.c dm: add helper macro for simple DM target module init and exit 2023-04-11 12:09:08 -04:00
dm-sysfs.c dm sysfs: make kobj_type structure constant 2023-02-14 14:23:08 -05:00
dm-table.c dm: limit swapping tables for devices with zone write plugs 2025-05-04 11:35:05 +02:00
dm-target.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-thin-metadata.c dm: Constify struct dm_block_validator 2024-07-19 12:08:15 +02:00
dm-thin-metadata.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-thin.c - dm-array fixes 2025-01-08 10:12:01 -08:00
dm-uevent.c dm: avoid spaces before function arguments or in favour of tabs 2023-02-14 14:23:06 -05:00
dm-uevent.h dm: fix undue/missing spaces 2023-02-14 14:23:06 -05:00
dm-unstripe.c dm-unstriped: cast an operand to sector_t to prevent potential uint32_t overflow 2024-11-04 17:34:56 +01:00
dm-verity-fec.c for-6.14/block-20250118 2025-01-20 19:38:46 -08:00
dm-verity-fec.h dm-verity: always "map" the data blocks 2024-07-03 21:41:11 +02:00
dm-verity-loadpin.c dm: verity-loadpin: Add NULL pointer check for 'bdev' parameter 2023-06-28 10:43:04 -07:00
dm-verity-target.c dm-verity: fix prefetch-vs-suspend race 2025-03-28 18:26:11 +01:00
dm-verity-verify-sig.c dm verity: fallback to platform keyring also if key in trusted keyring is rejected 2024-09-26 17:27:08 +02:00
dm-verity-verify-sig.h dm: add missing SPDX-License-Indentifiers 2023-02-14 14:23:06 -05:00
dm-verity.h dm-verity: remove the unused "data_start" variable 2024-11-20 11:44:44 +01:00
dm-writecache.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-zero.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-zone.c dm: fix native zone append devices on top of emulated ones 2025-05-04 11:35:05 +02:00
dm-zoned-metadata.c dm: zoned: Remove unused functions 2024-11-20 11:38:04 +01:00
dm-zoned-reclaim.c dm: Fix dm-zoned-reclaim zone write pointer alignment 2024-12-10 09:15:33 -07:00
dm-zoned-target.c dm: stop using blk_limits_io_{min,opt} 2024-07-10 13:10:06 +02:00
dm-zoned.h dm: zoned: Remove unused functions 2024-11-20 11:38:04 +01:00
dm.c dm: limit swapping tables for devices with zone write plugs 2025-05-04 11:35:05 +02:00
dm.h dm: limit swapping tables for devices with zone write plugs 2025-05-04 11:35:05 +02:00
Kconfig dm-crypt: switch to using the crc32 library 2025-02-03 14:10:10 +01:00
Makefile md: reintroduce md-linear 2025-01-13 07:36:29 -08:00
md-autodetect.c md: reintroduce md-linear 2025-01-13 07:36:29 -08:00
md-bitmap.c md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb 2025-03-05 00:34:00 +08:00
md-bitmap.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00
md-cluster.c md: switch md-cluster to use md_submodle_head 2025-03-05 00:28:39 +08:00
md-cluster.h md: switch md-cluster to use md_submodle_head 2025-03-05 00:28:39 +08:00
md-linear.c md: switch personalities to use md_submodule_head 2025-03-05 00:27:20 +08:00
md.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
md.h Merge tag 'md-6.15-20250312' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux into for-6.15/block 2025-03-13 05:34:51 -06:00
raid0.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid0.h md/raid0: add discard support for the 'original' layout 2023-06-30 15:43:50 -07:00
raid1-10.c Merge tag 'md-6.15-20250312' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux into for-6.15/block 2025-03-13 05:34:51 -06:00
raid1.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid1.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00
raid5-cache.c lib/crc32: standardize on crc32c() name for Castagnoli CRC32 2025-02-08 20:06:30 -08:00
raid5-log.h md/raid5-ppl: Drop unused argument from ppl_handle_flush_request() 2022-08-02 17:14:31 -06:00
raid5-ppl.c lib/crc32: standardize on crc32c() name for Castagnoli CRC32 2025-02-08 20:06:30 -08:00
raid5.c md/raid5: merge reshape_progress checking inside get_reshape_loc() 2025-03-05 00:31:27 +08:00
raid5.h md/md-bitmap: move bitmap_{start, end}write to md upper layer 2025-01-13 08:56:11 -08:00
raid10.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid10.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00