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linux-stable/fs/btrfs
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Qu Wenruo 011b46c304 btrfs: skip subtree scan if it's too high to avoid low stall in btrfs_commit_transaction() 
Btrfs qgroup has a long history of bringing performance penalty in
btrfs_commit_transaction().

Although we tried our best to migrate such impact, there is still an
unsolved call site, btrfs_drop_snapshot().

This function will find the highest shared tree block and modify its
extent ownership to do a subvolume/snapshot dropping.

Such change will affect the whole subtree, and cause tons of qgroup
dirty extents and stall btrfs_commit_transaction().

To avoid such problem, here we introduce a new sysfs interface,
/sys/fs/btrfs/<uuid>/qgroups/drop_subptree_threshold, to determine at
whether and at which level we should skip qgroup accounting for subtree
dropping.

The default value is BTRFS_MAX_LEVEL, thus every subtree drop will go
through qgroup accounting, to ensure qgroup numbers are kept as
consistent as possible.

While for performance sensitive cases, add a way to change the values to
more reasonable values like 3, to make any subtree, which is at or higher
than level 3, to mark qgroup inconsistent and skip the accounting.

The cost is obvious, the qgroup number is no longer consistent, but at
least performance is more reasonable, and users have the control.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-09-26 12:28:01 +02:00
..
tests btrfs: remove use btrfs_remove_free_space_cache instead of variant 2022-09-26 12:27:58 +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: enhance unsupported compat RO flags handling 2022-09-26 12:28:00 +02:00
block-group.h btrfs: get rid of block group caching progress logic 2022-09-26 12:27:58 +02:00
block-rsv.c btrfs: don't save block group root into super block 2022-09-26 12:28:00 +02:00
block-rsv.h btrfs: use enum for btrfs_block_rsv::type 2022-07-25 17:45:40 +02:00
btrfs_inode.h btrfs: add optimized btrfs_ino() version for 64 bits systems 2022-07-25 17:45:41 +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: give struct btrfs_bio a real end_io handler 2022-09-26 12:27:59 +02:00
compression.h for-5.20-tag 2022-08-03 14:54:52 -07:00
ctree.c btrfs: fix lockdep splat with reloc root extent buffers 2022-08-17 16:19:12 +02:00
ctree.h 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
delalloc-space.c btrfs: convert count_max_extents() to use fs_info->max_extent_size 2022-07-25 17:45:41 +02:00
delalloc-space.h
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
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: skip subtree scan if it's too high to avoid low stall in btrfs_commit_transaction() 2022-09-26 12:28:01 +02:00
disk-io.h btrfs: separate BLOCK_GROUP_TREE compat RO flag from EXTENT_TREE_V2 2022-09-26 12:28:00 +02:00
export.c
export.h
extent-io-tree.h btrfs: move btrfs_bio allocation to volumes.c 2022-09-26 12:27:58 +02:00
extent-tree.c btrfs: speedup checking for extent sharedness during fiemap 2022-09-26 12:28:01 +02:00
extent_io.c btrfs: make fiemap more efficient and accurate reporting extent sharedness 2022-09-26 12:28:01 +02:00
extent_io.h btrfs: move btrfs_bio allocation to volumes.c 2022-09-26 12:27:58 +02:00
extent_map.c btrfs: assert we have a write lock when removing and replacing extent maps 2022-03-14 13:13:50 +01:00
extent_map.h btrfs: defrag: don't use merged extent map for their generation check 2022-02-23 17:43:13 +01:00
file-item.c btrfs: rename btrfs_insert_file_extent() to btrfs_insert_hole_extent() 2022-09-26 12:27:54 +02:00
file.c btrfs: make fiemap more efficient and accurate reporting extent sharedness 2022-09-26 12:28:01 +02:00
free-space-cache.c btrfs: remove use btrfs_remove_free_space_cache instead of variant 2022-09-26 12:27:58 +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 fiemap more efficient and accurate reporting extent sharedness 2022-09-26 12:28:01 +02:00
ioctl.c btrfs: use fs_info->max_extent_size in get_extent_max_capacity() 2022-07-25 17:45:41 +02:00
Kconfig btrfs: use generic Kconfig option for 256kB page size limit 2022-01-20 08:52:55 +02:00
locking.c btrfs: fix lockdep splat with reloc root extent buffers 2022-08-17 16:19:12 +02:00
locking.h btrfs: fix lockdep splat with reloc root extent buffers 2022-08-17 16:19:12 +02:00
lzo.c btrfs: replace kmap() with kmap_local_page() in lzo.c 2022-07-25 17:45:33 +02:00
Makefile Kbuild: add -Wno-shift-negative-value where -Wextra is used 2022-03-13 17:30:31 +09:00
misc.h btrfs: use correct header for div_u64 in misc.h 2021-09-07 14:29:50 +02:00
ordered-data.c btrfs: add lockdep annotations for the ordered extents wait event 2022-09-26 12:27:53 +02:00
ordered-data.h btrfs: remove the finish_func argument to btrfs_mark_ordered_io_finished 2022-07-25 17:45:37 +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: skip subtree scan if it's too high to avoid low stall in btrfs_commit_transaction() 2022-09-26 12:28:01 +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: clean up chained assignments 2022-07-25 17:45:39 +02:00
reflink.h
relocation.c btrfs: fix lockdep splat with reloc root extent buffers 2022-08-17 16:19:12 +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: properly abstract the parity raid bio handling 2022-09-26 12:27:59 +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: dump all space infos if we abort transaction due to ENOSPC 2022-09-26 12:27:59 +02:00
space-info.h btrfs: dump all space infos if we abort transaction due to ENOSPC 2022-09-26 12:27:59 +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: enhance unsupported compat RO flags handling 2022-09-26 12:28:00 +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 save block group root into super block 2022-09-26 12:28:00 +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: simplify adding and replacing references during log replay 2022-09-26 12:27:57 +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
tree-mod-log.h
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: give struct btrfs_bio a real end_io handler 2022-09-26 12:27:59 +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: get rid of block group caching progress logic 2022-09-26 12:27:58 +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