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ee50cc19d8
linux/drivers/md
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Mikulas Patocka ee50cc19d8 dm writecache: don't split bios when overwriting contiguous cache content 
If dm-writecache overwrites existing cached data, it splits the
incoming bio into many block-sized bios. The I/O scheduler does merge
these bios into one large request but this needless splitting and
merging causes performance degradation.

Fix this by avoiding bio splitting if the cache target area that is
being overwritten is contiguous.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2021-06-04 12:07:26 -04:00
..
bcache include: remove pagemap.h from blkdev.h 2021-05-06 19:24:11 -07:00
persistent-data dm space map disk: cache a small number of index entries 2021-06-04 12:07:23 -04:00
dm-bio-prison-v1.c
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison v2: use true/false for bool variable 2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
dm-bio-record.h block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
dm-bufio.c dm bufio: subtract the number of initial sectors in dm_bufio_get_device_size 2021-03-04 14:53:54 -05:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm: use bdev_read_only to check if a device is read-only 2021-01-24 18:15:57 -07:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: remove needless request_queue NULL pointer checks 2021-03-26 14:53:42 -04:00
dm-clone-metadata.c dm clone metadata: remove unused function 2021-04-19 13:20:31 -04:00
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 dm-clone: use blkdev_issue_flush in commit_metadata 2021-01-27 09:51:48 -07:00
dm-core.h dm: fix deadlock when swapping to encrypted device 2021-02-11 09:45:28 -05:00
dm-crypt.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
dm-delay.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
dm-dust.c dm dust: remove h from printk format specifier 2021-02-03 10:10:04 -05:00
dm-ebs-target.c dm ebs: fix a few typos 2021-03-26 14:53:42 -04:00
dm-era-target.c dm space maps: improve performance with inc/dec on ranges of blocks 2021-06-04 12:07:22 -04:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c dm: simplify target code conditional on CONFIG_BLK_DEV_ZONED 2021-02-11 09:45:27 -05:00
dm-init.c dm init: Set file local variable static 2020-08-04 15:51:28 -04:00
dm-integrity.c dm integrity: fix sparse warnings 2021-05-13 14:53:49 -04:00
dm-io.c block: Add bio_max_segs 2021-02-26 15:49:51 -07:00
dm-ioctl.c dm ioctl: filter the returned values according to name or uuid prefix 2021-03-26 14:53:41 -04:00
dm-kcopyd.c dm kcopyd: avoid spin_lock_irqsave from process context 2021-06-04 12:07:25 -04:00
dm-linear.c dm: simplify target code conditional on CONFIG_BLK_DEV_ZONED 2021-02-11 09:45:27 -05:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c block: Add bio_max_segs 2021-02-26 15:49:51 -07:00
dm-log.c
dm-mpath.c dm: use dm_table_get_device_name() where appropriate in targets 2020-09-29 16:33:08 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-ps-historical-service-time.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-io-affinity.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-queue-length.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-round-robin.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-service-time.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-raid1.c dm kcopyd: avoid useless atomic operations 2021-06-04 12:07:24 -04:00
dm-raid.c dm raid: remove unnecessary discard limits for raid0 and raid10 2021-04-30 14:38:37 -04:00
dm-region-hash.c
dm-rq.c dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails 2021-04-30 14:19:08 -04:00
dm-rq.h
dm-snap-persistent.c dm: replace dm_vcalloc() 2021-04-19 13:13:26 -04:00
dm-snap-transient.c
dm-snap.c dm snapshot: properly fix a crash when an origin has no snapshots 2021-05-25 16:19:58 -04:00
dm-stats.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-stats.h
dm-stripe.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-switch.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-sysfs.c
dm-table.c dm: replace dm_vcalloc() 2021-04-19 13:13:26 -04:00
dm-target.c
dm-thin-metadata.c dm space maps: improve performance with inc/dec on ranges of blocks 2021-06-04 12:07:22 -04:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-05 17:05:24 -05:00
dm-thin.c dm thin: remove needless request_queue NULL pointer check 2021-03-26 14:53:42 -04:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-verity-fec.c dm verity fec: fix misaligned RS roots IO 2021-04-14 14:28:29 -04:00
dm-verity-fec.h dm verity fec: fix misaligned RS roots IO 2021-04-14 14:28:29 -04:00
dm-verity-target.c dm verity: allow only one error handling mode 2021-03-26 14:53:41 -04:00
dm-verity-verify-sig.c dm verity: fix require_signatures module_param permissions 2021-05-25 16:14:05 -04:00
dm-verity-verify-sig.h dm verity: Fix compilation warning 2020-08-04 15:48:13 -04:00
dm-verity.h dm verity: add "panic_on_corruption" error handling mode 2020-07-13 11:47:33 -04:00
dm-writecache.c dm writecache: don't split bios when overwriting contiguous cache content 2021-06-04 12:07:26 -04:00
dm-zero.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-zoned-metadata.c block: use an on-stack bio in blkdev_issue_flush 2021-01-27 09:51:48 -07:00
dm-zoned-reclaim.c dm kcopyd: avoid useless atomic operations 2021-06-04 12:07:24 -04:00
dm-zoned-target.c dm table: Fix zoned model check and zone sectors check 2021-03-22 12:32:31 -04:00
dm-zoned.h dm zoned: select reclaim zone based on device index 2020-06-05 14:59:53 -04:00
dm.c dm: unexport dm_{get,put}_table_device 2021-03-26 14:53:42 -04:00
dm.h dm table: fix DAX iterate_devices based device capability checks 2021-02-09 08:45:30 -05:00
Kconfig dm crypt: support using trusted keys 2021-02-03 10:13:00 -05:00
Makefile dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
md-autodetect.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
md-bitmap.c md/bitmap: wait for external bitmap writes to complete during tear down 2021-04-15 11:06:32 -07:00
md-bitmap.h
md-cluster.c for-5.11/drivers-2020-12-14 2020-12-16 13:09:32 -08:00
md-cluster.h
md-faulty.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
md-linear.c block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
md-linear.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
md-multipath.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
md-multipath.h
md.c md-cluster: fix use-after-free issue when removing rdev 2021-04-23 09:39:04 -07:00
md.h md: add md_submit_discard_bio() for submitting discard bio 2021-03-24 16:29:06 -07:00
raid0.c md: add md_submit_discard_bio() for submitting discard bio 2021-03-24 16:29:06 -07:00
raid0.h
raid1-10.c
raid1.c md/raid1: properly indicate failure when ending a failed write request 2021-04-23 09:40:17 -07:00
raid1.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
raid5-cache.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
raid5-log.h
raid5-ppl.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
raid5.c treewide: Change list_sort to use const pointers 2021-04-08 16:04:22 -07:00
raid5.h md/raid5: let multiple devices of stripe_head share page 2020-09-24 16:44:44 -07:00
raid10.c md/raid10: improve discard request for far layout 2021-03-24 16:29:07 -07:00
raid10.h md/raid10: improve discard request for far layout 2021-03-24 16:29:07 -07:00