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linux-stable/fs/btrfs
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Christoph Hellwig da02361807 btrfs: submit IO synchronously for fast checksum implementations 
Most modern hardware supports very fast accelerated crc32c calculation.
If that is supported the CPU overhead of the checksum calculation is
very limited, and offloading the calculation to special worker threads
has a lot of overhead for no gain.

E.g. on an Intel Optane device is actually very much slows down even
1M buffered writes with fio:

Unpatched:

write: IOPS=3316, BW=3316MiB/s (3477MB/s)(200GiB/61757msec); 0 zone resets

With synchronous CRCs:

write: IOPS=4882, BW=4882MiB/s (5119MB/s)(200GiB/41948msec); 0 zone resets

With a lot of variation during the unpatched run going down as low as
1100MB/s, while the synchronous CRC version has about the same peak write
speed but much lower dips, and fewer kworkers churning around.
Both tests had fio saturated at 100% CPU.

(thanks to Jens Axboe via Chris Mason for the benchmarking)

Reviewed-by: Chris Mason <clm@fb.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2023-06-19 13:59:23 +02:00
..
tests btrfs: replace map_lookup->stripe_len by BTRFS_STRIPE_LEN 2023-04-17 18:01:14 +02:00
accessors.c btrfs: add eb to btrfs_node_key_ptr_offset 2022-12-05 18:00:58 +01:00
accessors.h btrfs: add stack helpers for a few btrfs items 2022-12-05 18:00:58 +01:00
acl.c fs: port acl to mnt_idmap 2023-01-19 09:24:28 +01:00
acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
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: fix backref walking not returning all inode refs 2023-05-09 22:09:11 +02:00
backref.h btrfs: fix backref walking not returning all inode refs 2023-05-09 22:09:11 +02:00
bio.c btrfs: submit IO synchronously for fast checksum implementations 2023-06-19 13:59:23 +02:00
bio.h btrfs: introduce a new helper to submit write bio for repair 2023-04-17 18:01:23 +02:00
block-group.c btrfs: scrub: try harder to mark RAID56 block groups read-only 2023-05-17 11:59:46 +02:00
block-group.h btrfs: scrub: remove the old scrub recheck code 2023-04-17 18:01:24 +02:00
block-rsv.c btrfs: don't free qgroup space unless specified 2023-05-03 16:37:56 +02:00
block-rsv.h btrfs: simplify variables in btrfs_block_rsv_refill() 2023-04-17 18:01:19 +02:00
btrfs_inode.h btrfs: avoid iterating over all indexes when logging directory 2023-04-17 19:52:19 +02:00
check-integrity.c btrfs: use SECTOR_SHIFT to convert physical offset to LBA 2023-06-19 13:59:23 +02:00
check-integrity.h btrfs: check-integrity: split submit_bio from btrfsic checking 2022-05-16 17:03:12 +02:00
compression.c btrfs: use SECTOR_SHIFT to convert physical offset to LBA 2023-06-19 13:59:23 +02:00
compression.h btrfs: move kthread_associate_blkcg out of btrfs_submit_compressed_write 2023-04-17 18:01:22 +02:00
ctree.c btrfs: improve leaf dump and error handling 2023-06-19 13:59:23 +02:00
ctree.h btrfs: print-tree: pass const extent buffer pointer 2023-06-19 13:59:22 +02:00
defrag.c btrfs: remove the wait argument to btrfs_start_ordered_extent 2023-02-13 17:50:34 +01:00
defrag.h btrfs: move defrag related prototypes to their own header 2022-12-05 18:00:46 +01:00
delalloc-space.c btrfs: count extents before taking inode's spinlock when reserving metadata 2023-04-17 18:01:19 +02:00
delalloc-space.h btrfs: move delalloc space related prototypes to delalloc-space.h 2022-12-05 18:00:44 +01:00
delayed-inode.c btrfs: handle btrfs_del_item errors in __btrfs_update_delayed_inode 2023-03-06 19:28:19 +01:00
delayed-inode.h btrfs: extend btrfs_dir_item type to store encryption status 2022-12-05 18:00:43 +01:00
delayed-ref.c btrfs: add helper to calculate space for delayed references 2023-04-17 18:01:19 +02:00
delayed-ref.h btrfs: add helper to calculate space for delayed references 2023-04-17 18:01:19 +02:00
dev-replace.c btrfs: use btrfs_dev_name() helper to handle missing devices better 2022-12-05 18:00:57 +01:00
dev-replace.h btrfs: move dev-replace prototypes into dev-replace.h 2022-12-05 18:00:47 +01:00
dir-item.c btrfs: move dir-item prototypes into dir-item.h 2022-12-05 18:00:46 +01:00
dir-item.h btrfs: move dir-item prototypes into dir-item.h 2022-12-05 18:00:46 +01:00
discard.c btrfs: reinterpret async discard iops_limit=0 as no delay 2023-04-21 00:28:23 +02:00
discard.h
disk-io.c btrfs: do not ASSERT() on duplicated global roots 2023-06-13 01:21:16 +02:00
disk-io.h btrfs: rename btrfs_clean_tree_block to btrfs_clear_buffer_dirty 2023-02-15 19:38:53 +01:00
export.c btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
export.h btrfs: simplify generation check in btrfs_get_dentry 2022-12-05 18:00:41 +01:00
extent-io-tree.c btrfs: fix spelling mistakes found using codespell 2023-02-15 19:38:50 +01:00
extent-io-tree.h btrfs: remove the io_failure_record infrastructure 2023-02-15 19:38:51 +01:00
extent-tree.c btrfs: use SECTOR_SHIFT to convert LBA to physical offset 2023-06-19 13:59:23 +02:00
extent-tree.h btrfs: introduce size class to block group allocator 2023-02-13 17:50:34 +01:00
extent_io.c btrfs: introduce btrfs_bio::fs_info member 2023-04-17 18:01:23 +02:00
extent_io.h btrfs: combine btrfs_clear_buffer_dirty and clear_extent_buffer_dirty 2023-02-15 19:38:54 +01:00
extent_map.c btrfs: fix extent map logging bit not cleared for split maps after dropping range 2023-03-06 19:28:19 +01:00
extent_map.h btrfs: remove no longer used btrfs_next_extent_map() 2022-12-05 18:00:56 +01:00
file-item.c btrfs: use SECTOR_SHIFT to convert LBA to physical offset 2023-06-19 13:59:23 +02:00
file-item.h btrfs: scrub: introduce helper to find and fill sector info for a scrub_stripe 2023-04-17 18:01:23 +02:00
file.c iov_iter: add iter_iovec() helper 2023-03-30 08:12:29 -06:00
file.h btrfs: use cached state when looking for delalloc ranges with fiemap 2022-12-05 18:00:56 +01:00
free-space-cache.c btrfs: fix space cache inconsistency after error loading it from disk 2023-05-09 22:08:05 +02:00
free-space-cache.h btrfs: convert discard stat defs to enum 2022-12-05 18:00:45 +01:00
free-space-tree.c btrfs: make clear_cache mount option to rebuild FST without disabling it 2023-05-10 14:51:27 +02:00
free-space-tree.h btrfs: make clear_cache mount option to rebuild FST without disabling it 2023-05-10 14:51:27 +02:00
fs.c btrfs: sysfs: update fs features directory asynchronously 2023-02-13 17:50:35 +01:00
fs.h btrfs: scrub: remove scrub_parity structure 2023-04-17 18:01:24 +02:00
inode-item.c btrfs: remove obsolete delayed ref throttling logic when truncating items 2023-04-17 18:01:19 +02:00
inode-item.h btrfs: use struct fscrypt_str instead of struct qstr 2022-12-05 18:00:43 +01:00
inode.c btrfs: use SECTOR_SHIFT to convert physical offset to LBA 2023-06-19 13:59:23 +02:00
ioctl.c btrfs: don't commit transaction for every subvol create 2023-06-19 13:59:22 +02:00
ioctl.h fs: port ->fileattr_set() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
Kconfig block: make blkcg_punt_bio_submit optional 2023-04-17 18:01:22 +02:00
locking.c btrfs: locking: use atomic for DREW lock writers 2023-04-17 18:01:17 +02:00
locking.h btrfs: locking: use atomic for DREW lock writers 2023-04-17 18:01:17 +02:00
lru_cache.c btrfs: send: cache utimes operations for directories if possible 2023-02-15 19:38:50 +01:00
lru_cache.h btrfs: remove btrfs_lru_cache_is_full() inline function 2023-04-17 18:01:18 +02:00
lzo.c btrfs: move zero filling of compressed read bios into common code 2023-04-17 18:01:17 +02:00
Makefile btrfs: send: genericize the backref cache to allow it to be reused 2023-02-13 17:50:35 +01:00
messages.c btrfs: mark btrfs_assertfail() __noreturn 2023-04-17 19:52:19 +02:00
messages.h btrfs: mark btrfs_assertfail() __noreturn 2023-04-17 19:52:19 +02:00
misc.h btrfs: export bitmap_test_range_all_{set,zero} 2023-06-19 13:59:22 +02:00
ordered-data.c btrfs: fold btrfs_clone_ordered_extent into btrfs_split_ordered_extent 2023-04-17 18:01:21 +02:00
ordered-data.h btrfs: sink parameter len to btrfs_split_ordered_extent 2023-04-17 18:01:21 +02:00
orphan.c btrfs: move orphan prototypes into orphan.h 2022-12-05 18:00:47 +01:00
orphan.h btrfs: move orphan prototypes into orphan.h 2022-12-05 18:00:47 +01:00
print-tree.c btrfs: print-tree: pass const extent buffer pointer 2023-06-19 13:59:22 +02:00
print-tree.h btrfs: print-tree: pass const extent buffer pointer 2023-06-19 13:59:22 +02:00
props.c btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
props.h btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
qgroup.c btrfs: fix race between quota disable and quota assign ioctls 2023-03-28 00:46:53 +02:00
qgroup.h btrfs: sink gfp_t parameter to btrfs_qgroup_trace_extent 2022-12-05 18:00:43 +01:00
raid56.c btrfs: use SECTOR_SHIFT to convert LBA to physical offset 2023-06-19 13:59:23 +02:00
raid56.h btrfs: remove unused raid56 functions which were dedicated for scrub 2023-04-17 19:52:18 +02:00
rcu-string.h btrfs: replace strncpy() with strscpy() 2022-12-05 18:00:59 +01:00
ref-verify.c btrfs: move accessor helpers into accessors.h 2022-12-05 18:00:42 +01:00
ref-verify.h
reflink.c btrfs: pass btrfs_inode to btrfs_inode_unlock 2022-12-05 18:00:53 +01:00
reflink.h
relocation.c btrfs: fix backref walking not returning all inode refs 2023-05-09 22:09:11 +02:00
relocation.h btrfs: move relocation prototypes into relocation.h 2022-12-05 18:00:47 +01:00
root-tree.c btrfs: move orphan prototypes into orphan.h 2022-12-05 18:00:47 +01:00
root-tree.h btrfs: move root tree prototypes to their own header 2022-12-05 18:00:44 +01:00
scrub.c btrfs: scrub: fix a return value overwrite in scrub_stripe() 2023-06-14 18:30:30 +02:00
scrub.h btrfs: scrub: remove scrub_bio structure 2023-04-17 18:01:24 +02:00
send.c btrfs: fix uninitialized variable warnings 2023-04-17 19:52:19 +02:00
send.h btrfs: send add define for v2 buffer size 2022-12-05 18:00:41 +01:00
space-info.c btrfs: add helper to calculate space for delayed references 2023-04-17 18:01:19 +02:00
space-info.h btrfs: update documentation for BTRFS_RESERVE_FLUSH_EVICT flush method 2023-04-17 18:01:18 +02:00
subpage.c btrfs: export bitmap_test_range_all_{set,zero} 2023-06-19 13:59:22 +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: properly enable async discard when switching from RO->RW 2023-06-06 19:44:22 +02:00
super.h btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
sysfs.c btrfs: sysfs: relax bg_reclaim_threshold for debugging purposes 2023-04-17 18:01:18 +02:00
sysfs.h btrfs: sysfs: update fs features directory asynchronously 2023-02-13 17:50:35 +01:00
transaction.c btrfs: correctly calculate delayed ref bytes when starting transaction 2023-04-17 18:01:22 +02:00
transaction.h btrfs: move btrfs_abort_transaction to transaction.c 2023-02-13 17:50:33 +01:00
tree-checker.c btrfs: reduce div64 calls by limiting the number of stripes of a chunk to u32 2023-04-17 18:01:14 +02:00
tree-checker.h btrfs: move struct btrfs_tree_parent_check out of disk-io.h 2022-12-05 18:00:57 +01:00
tree-log.c btrfs: fix an uninitialized variable warning in btrfs_log_inode 2023-05-26 23:24:04 +02:00
tree-log.h btrfs: use a negative value for BTRFS_LOG_FORCE_COMMIT 2023-02-13 17:50:34 +01:00
tree-mod-log.c btrfs: add eb to btrfs_node_key_ptr_offset 2022-12-05 18:00:58 +01:00
tree-mod-log.h btrfs: fix SPDX comment in tree-mod-log.h 2022-12-05 18:00:48 +01:00
ulist.c btrfs: constify ulist parameter of ulist_next() 2022-12-05 18:00:50 +01:00
ulist.h btrfs: constify ulist parameter of ulist_next() 2022-12-05 18:00:50 +01:00
uuid-tree.c btrfs: move uuid tree prototypes to uuid-tree.h 2022-12-05 18:00:46 +01:00
uuid-tree.h btrfs: move uuid tree prototypes to uuid-tree.h 2022-12-05 18:00:46 +01:00
verity.c fsverity: pass pos and size to ->write_merkle_tree_block 2023-01-01 15:46:48 -08:00
verity.h btrfs: move verity prototypes into verity.h 2022-12-05 18:00:47 +01:00
volumes.c btrfs: make btrfs_free_device() static 2023-06-19 13:59:22 +02:00
volumes.h btrfs: make btrfs_free_device() static 2023-06-19 13:59:22 +02:00
xattr.c fs: drop unused posix acl handlers 2023-03-06 09:57:12 +01:00
xattr.h
zlib.c btrfs: move zero filling of compressed read bios into common code 2023-04-17 18:01:17 +02:00
zoned.c btrfs: export bitmap_test_range_all_{set,zero} 2023-06-19 13:59:22 +02:00
zoned.h btrfs: pass a btrfs_bio to btrfs_use_append 2023-02-15 19:38:55 +01:00
zstd.c btrfs: move zero filling of compressed read bios into common code 2023-04-17 18:01:17 +02:00