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926078b21d
linux/fs/btrfs
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Stefan Roesch 926078b21d btrfs: enable nowait async buffered writes 
Enable nowait async buffered writes in btrfs_do_write_iter() and
btrfs_file_open().

In this version encoded buffered writes have the optimization not
enabled. Encoded writes are enabled by using an ioctl. io_uring
currently does not support ioctls. This might be enabled in the future.

Performance results:

  For fio the following results have been obtained with a queue depth of
  1 and 4k block size (runtime 600 secs):

                 sequential writes:
                 without patch           with patch      libaio     psync
  iops:              55k                    134k          117K       148K
  bw:               221MB/s                 538MB/s       469MB/s    592MB/s
  clat:           15286ns                    82ns         994ns     6340ns

For an io depth of 1, the new patch improves throughput by over two
times (compared to the existing behavior, where buffered writes are
processed by an io-worker process) and also the latency is considerably
reduced. To achieve the same or better performance with the existing
code an io depth of 4 is required.  Increasing the iodepth further does
not lead to improvements.

The tests have been run like this:

./fio --name=seq-writers --ioengine=psync --iodepth=1 --rw=write \
  --bs=4k --direct=0 --size=100000m --time_based --runtime=600   \
  --numjobs=1 --filename=...
./fio --name=seq-writers --ioengine=io_uring --iodepth=1 --rw=write \
  --bs=4k --direct=0 --size=100000m --time_based --runtime=600   \
  --numjobs=1 --filename=...
./fio --name=seq-writers --ioengine=libaio --iodepth=1 --rw=write \
  --bs=4k --direct=0 --size=100000m --time_based --runtime=600   \
  --numjobs=1 --filename=...

Testing:
  This patch has been tested with xfstests, fsx, fio. xfstests shows no new
  diffs compared to running without the patch series.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-09-29 17:08:29 +02:00
..
tests btrfs: stop tracking failed reads in the I/O tree 2022-09-26 12:28:05 +02:00
acl.c btrfs: reserve correct number of items for inode creation 2022-05-16 17:03:08 +02:00
async-thread.c btrfs: simplify WQ_HIGHPRI handling in struct btrfs_workqueue 2022-05-16 17:03:15 +02:00
async-thread.h btrfs: remove unused typedefs get_extent_t and btrfs_work_func_t 2022-07-25 17:45:36 +02:00
backref.c btrfs: skip unnecessary extent buffer sharedness checks during fiemap 2022-09-26 12:28:01 +02:00
backref.h btrfs: skip unnecessary extent buffer sharedness checks during fiemap 2022-09-26 12:28:01 +02:00
block-group.c btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
block-group.h btrfs: move btrfs_full_stripe_locks_tree into block-group.h 2022-09-26 12:28:06 +02:00
block-rsv.c btrfs: add KCSAN annotations for unlocked access to block_rsv->full 2022-09-26 12:28:02 +02:00
block-rsv.h btrfs: add KCSAN annotations for unlocked access to block_rsv->full 2022-09-26 12:28:02 +02:00
btrfs_inode.h btrfs: use a runtime flag to indicate an inode is a free space inode 2022-09-26 12:28:07 +02:00
check-integrity.c fs/btrfs: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:32 -06:00
check-integrity.h btrfs: check-integrity: split submit_bio from btrfsic checking 2022-05-16 17:03:12 +02:00
compression.c btrfs: unify the lock/unlock extent variants 2022-09-26 12:28:05 +02:00
compression.h for-5.20-tag 2022-08-03 14:54:52 -07:00
ctree.c btrfs: assert nowait mode is not used for some btree search functions 2022-09-29 17:08:29 +02:00
ctree.h btrfs: make btrfs_check_nocow_lock nowait compatible 2022-09-29 17:08:28 +02:00
delalloc-space.c btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delalloc-space.h btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delayed-inode.c btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
delayed-inode.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
delayed-ref.c btrfs: switch btrfs_block_rsv::full to bool 2022-07-25 17:45:40 +02:00
delayed-ref.h btrfs: remove btrfs_delayed_extent_op::is_data 2022-05-16 17:17:31 +02:00
dev-replace.c btrfs: don't take a bio_counter reference for cloned bios 2022-09-26 12:27:58 +02:00
dev-replace.h btrfs: add struct declarations in dev-replace.h 2022-09-26 12:28:07 +02:00
dir-item.c btrfs: use btrfs_for_each_slot in btrfs_search_dir_index_item 2022-05-16 17:03:07 +02:00
discard.c btrfs: fix typos in comments 2021-06-22 14:11:57 +02:00
discard.h
disk-io.c btrfs: relax block-group-tree feature dependency checks 2022-09-26 12:28:07 +02:00
disk-io.h btrfs: relax block-group-tree feature dependency checks 2022-09-26 12:28:07 +02:00
export.c
export.h
extent_io.c btrfs: move end_io_func argument to btrfs_bio_ctrl structure 2022-09-26 12:28:07 +02:00
extent_io.h btrfs: move extent io tree unrelated prototypes to their appropriate header 2022-09-26 12:28:04 +02:00
extent_map.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
extent_map.h btrfs: defrag: don't use merged extent map for their generation check 2022-02-23 17:43:13 +01:00
extent-io-tree.c btrfs: remove is_data_inode() checks in extent-io-tree.c 2022-09-26 12:28:05 +02:00
extent-io-tree.h btrfs: stop tracking failed reads in the I/O tree 2022-09-26 12:28:05 +02:00
extent-tree.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
file-item.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
file.c btrfs: enable nowait async buffered writes 2022-09-29 17:08:29 +02:00
free-space-cache.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
free-space-cache.h btrfs: remove use btrfs_remove_free_space_cache instead of variant 2022-09-26 12:27:58 +02:00
free-space-tree.c btrfs: get rid of block group caching progress logic 2022-09-26 12:27:58 +02:00
free-space-tree.h
inode-item.c btrfs: make should_throttle loop local in btrfs_truncate_inode_items 2022-01-07 14:18:25 +01:00
inode-item.h btrfs: add inode to truncate control 2022-01-07 14:18:24 +01:00
inode.c btrfs: make btrfs_check_nocow_lock nowait compatible 2022-09-29 17:08:28 +02:00
ioctl.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
Kconfig btrfs: use generic Kconfig option for 256kB page size limit 2022-01-20 08:52:55 +02:00
locking.c btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
locking.h btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
lzo.c btrfs: replace kmap() with kmap_local_page() in lzo.c 2022-07-25 17:45:33 +02:00
Makefile btrfs: move extent state init and alloc functions to their own file 2022-09-26 12:28:03 +02:00
misc.h btrfs: convert the io_failure_tree to a plain rb_tree 2022-09-26 12:28:02 +02:00
ordered-data.c btrfs: add btrfs_try_lock_ordered_range 2022-09-29 17:08:28 +02:00
ordered-data.h btrfs: add btrfs_try_lock_ordered_range 2022-09-29 17:08:28 +02:00
orphan.c
print-tree.c btrfs: unify the error handling pattern for read_tree_block() 2022-03-14 13:13:53 +01:00
print-tree.h
props.c btrfs: remove the unnecessary result variables 2022-09-26 12:28:00 +02:00
props.h btrfs: move common inode creation code into btrfs_create_new_inode() 2022-05-16 17:03:08 +02:00
qgroup.c btrfs: qgroup: fix a typo in a comment 2022-09-26 12:28:02 +02:00
qgroup.h btrfs: introduce BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING to skip qgroup accounting 2022-09-26 12:28:01 +02:00
raid56.c btrfs: properly abstract the parity raid bio handling 2022-09-26 12:27:59 +02:00
raid56.h btrfs: properly abstract the parity raid bio handling 2022-09-26 12:27:59 +02:00
rcu-string.h
ref-verify.c btrfs: stop accessing ->extent_root directly 2022-01-03 15:09:49 +01:00
ref-verify.h
reflink.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
reflink.h
relocation.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
root-tree.c btrfs: simplify error handling at btrfs_del_root_ref() 2022-09-26 12:27:58 +02:00
scrub.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
send.c btrfs: send: fix failures when processing inodes with no links 2022-09-26 12:27:57 +02:00
send.h btrfs: send: add support for fs-verity 2022-09-26 12:27:55 +02:00
space-info.c btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
space-info.h btrfs: move btrfs_init_async_reclaim_work prototype to space-info.h 2022-09-26 12:28:06 +02:00
struct-funcs.c btrfs: remove redundant check in up check_setget_bounds 2022-07-25 17:45:33 +02:00
subpage.c btrfs: remove extent writepage address space operation 2022-07-25 17:45:37 +02:00
subpage.h btrfs: make nodesize >= PAGE_SIZE case to reuse the non-subpage routine 2022-05-16 17:03:11 +02:00
super.c btrfs: relax block-group-tree feature dependency checks 2022-09-26 12:28:07 +02:00
sysfs.c btrfs: skip subtree scan if it's too high to avoid low stall in btrfs_commit_transaction() 2022-09-26 12:28:01 +02:00
sysfs.h
transaction.c btrfs: don't init io tree with private data for non-inodes 2022-09-26 12:28:05 +02:00
transaction.h btrfs: pass btrfs_fs_info for deleting snapshots and cleaner 2022-03-14 13:13:52 +01:00
tree-checker.c btrfs: tree-checker: check for overlapping extent items 2022-08-17 16:20:25 +02:00
tree-checker.h btrfs: tree-checker: check extent buffer owner against owner rootid 2022-05-16 17:03:09 +02:00
tree-defrag.c btrfs: remove unnecessary extent root check in btrfs_defrag_leaves 2022-01-03 15:09:48 +01:00
tree-log.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
tree-log.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
tree-mod-log.c btrfs: fix race when picking most recent mod log operation for an old root 2021-04-20 19:27:17 +02:00
tree-mod-log.h btrfs: add and use helper to get lowest sequence number for the tree mod log 2021-04-19 17:25:17 +02:00
ulist.c
ulist.h
uuid-tree.c btrfs: drop the _nr from the item helpers 2022-01-03 15:09:43 +01:00
verity.c btrfs: send: add support for fs-verity 2022-09-26 12:27:55 +02:00
volumes.c btrfs: check superblock to ensure the fs was not modified at thaw time 2022-09-26 12:27:59 +02:00
volumes.h btrfs: move btrfs_swapfile_pin into volumes.h 2022-09-26 12:28:06 +02:00
xattr.c btrfs: check if root is readonly while setting security xattr 2022-08-22 18:06:30 +02:00
xattr.h
zlib.c btrfs: zlib: replace kmap() with kmap_local_page() in zlib_decompress_bio() 2022-07-25 17:45:41 +02:00
zoned.c btrfs: zoned: refactor device checks in btrfs_check_zoned_mode 2022-09-26 12:28:02 +02:00
zoned.h btrfs: zoned: activate metadata block group on flush_space 2022-07-25 17:45:42 +02:00
zstd.c btrfs: zstd: replace kmap() with kmap_local_page() 2022-07-25 17:45:40 +02:00