Brian Foster 90a71daaf7 xfs: skip background cowblock trims on inodes open for write ... The background blockgc scanner runs on a 5m interval by default and trims preallocation (post-eof and cow fork) from inodes that are otherwise idle. Idle effectively means that iolock can be acquired without blocking and that the inode has no dirty pagecache or I/O in flight. This simple mechanism and heuristic has worked fairly well for post-eof speculative preallocations. Support for reflink and COW fork preallocations came sometime later and plugged into the same mechanism, with similar heuristics. Some recent testing has shown that COW fork preallocation may be notably more sensitive to blockgc processing than post-eof preallocation, however. For example, consider an 8GB reflinked file with a COW extent size hint of 1MB. A worst case fully randomized overwrite of this file results in ~8k extents of an average size of ~1MB. If the same workload is interrupted a couple times for blockgc processing (assuming the file goes idle), the resulting extent count explodes to over 100k extents with an average size <100kB. This is significantly worse than ideal and essentially defeats the COW extent size hint mechanism. While this particular test is instrumented, it reflects a fairly reasonable pattern in practice where random I/Os might spread out over a large period of time with varying periods of (in)activity. For example, consider a cloned disk image file for a VM or container with long uptime and variable and bursty usage. A background blockgc scan that races and processes the image file when it happens to be clean and idle can have a significant effect on the future fragmentation level of the file, even when still in use. To help combat this, update the heuristic to skip cowblocks inodes that are currently opened for write access during non-sync blockgc scans. This allows COW fork preallocations to persist for as long as possible unless otherwise needed for functional purposes (i.e. a sync scan), the file is idle and closed, or the inode is being evicted from cache. While here, update the comments to help distinguish performance oriented heuristics from the logic that exists to maintain functional correctness. Suggested-by: Darrick Wong <djwong@kernel.org> Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Carlos Maiolino <cem@kernel.org>		2024-10-07 08:00:12 +02:00
..
9p	netfs: Speed up buffered reading	2024-09-12 12:20:41 +02:00
adfs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
affs	affs-for-6.12-tag	2024-09-16 13:07:59 +02:00
afs	afs: Fix the setting of the server responding flag	2024-09-27 18:29:20 +02:00
autofs	autofs: add per dentry expire timeout	2024-08-30 08:22:36 +02:00
bcachefs	bcachefs fixes for 6.12-rc2	2024-10-05 15:18:04 -07:00
befs	befs: Convert befs_symlink_read_folio() to use folio_end_read()	2024-05-31 12:31:39 +02:00
bfs	fs: Convert aops->write_begin to take a folio	2024-08-07 11:33:21 +02:00
btrfs	for-6.12-rc1-tag	2024-10-04 10:05:13 -07:00
cachefiles	cachefiles: fix dentry leak in cachefiles_open_file()	2024-09-27 18:29:19 +02:00
ceph	A fix from Patrick for a variety of CephFS lockup scenarios caused by	2024-10-04 10:10:23 -07:00
coda	coda: use param->file for FSCONFIG_SET_FD	2024-08-19 13:45:03 +02:00
configfs	fs/configfs: Add a callback to determine attribute visibility	2024-06-17 20:42:57 +02:00
cramfs	vfs-6.11.module.description	2024-07-15 11:14:59 -07:00
crypto	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
debugfs	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
devpts
dlm	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
ecryptfs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
efivarfs	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
efs	vfs-6.11.module.description	2024-07-15 11:14:59 -07:00
erofs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
exfat	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
exportfs	fhandle: relax open_by_handle_at() permission checks	2024-05-28 15:57:23 +02:00
ext2	vfs-6.12.file	2024-09-16 09:14:02 +02:00
ext4	ext4: fix off by one issue in alloc_flex_gd()	2024-10-04 17:36:28 -04:00
f2fs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
fat	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
freevxfs
fuse	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
gfs2	gfs2 changes	2024-09-23 11:55:17 -07:00
hfs	fs: Convert aops->write_begin to take a folio	2024-08-07 11:33:21 +02:00
hfsplus	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
hostfs	fs: Convert aops->write_begin to take a folio	2024-08-07 11:33:21 +02:00
hpfs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
hugetlbfs	fs: Convert aops->write_begin to take a folio	2024-08-07 11:33:21 +02:00
iomap	iomap: constrain the file range passed to iomap_file_unshare	2024-10-03 10:22:28 +02:00
isofs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
jbd2	jbd2: remove unneeded check of ret in jbd2_fc_get_buf	2024-08-26 23:49:15 -04:00
jffs2	jffs2: Use a folio in jffs2_garbage_collect_dnode()	2024-08-19 13:40:00 +02:00
jfs	A few fixes for jfs	2024-09-19 06:38:43 +02:00
kernfs	kernfs: mount: Remove unnecessary ‘NULL’ values from knparent	2024-05-04 19:02:39 +02:00
lockd	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
minix	buffer: Convert __block_write_begin() to take a folio	2024-08-07 11:33:36 +02:00
netfs	netfs: Fix missing wakeup after issuing writes	2024-10-02 16:56:15 +02:00
nfs	NFS Client Updates for Linux 6.12	2024-09-24 15:44:18 -07:00
nfs_common	nfs: add LOCALIO support	2024-09-23 15:03:30 -04:00
nfsd	inotify: Fix possible deadlock in fsnotify_destroy_mark	2024-10-02 15:14:29 +02:00
nilfs2	Many singleton patches - please see the various changelogs for details.	2024-09-21 08:20:50 -07:00
nls	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
notify	inotify: Fix possible deadlock in fsnotify_destroy_mark	2024-10-02 15:14:29 +02:00
ntfs3	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
ocfs2	ocfs2: fix uninit-value in ocfs2_get_block()	2024-09-26 14:01:45 -07:00
omfs	fs: Convert aops->write_begin to take a folio	2024-08-07 11:33:21 +02:00
openpromfs	openpromfs: add missing MODULE_DESCRIPTION() macro	2024-06-20 09:46:01 +02:00
orangefs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
overlayfs	ovl: fix file leak in ovl_real_fdget_meta()	2024-09-27 12:38:47 -07:00
proc	Summary	2024-09-24 11:08:40 -07:00
pstore	drm next for 6.12-rc1	2024-09-19 10:18:15 +02:00
qnx4	qnx4: add MODULE_DESCRIPTION()	2024-05-28 11:52:53 +02:00
qnx6	qnx6: Convert directory handling to use kmap_local	2024-08-07 11:31:56 +02:00
quota	\n	2024-09-23 10:49:28 -07:00
ramfs	mm: switch mm->get_unmapped_area() to a flag	2024-04-25 20:56:25 -07:00
reiserfs	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
romfs	romfs: fix romfs_read_folio()	2024-08-21 22:32:58 +02:00
smb	nine smb3 client fixes	2024-10-04 09:56:05 -07:00
squashfs	Many singleton patches - please see the various changelogs for details.	2024-09-21 08:20:50 -07:00
sysfs	Merge 6.9-rc5 into driver-core-next	2024-04-23 13:27:43 +02:00
sysv	buffer: Convert __block_write_begin() to take a folio	2024-08-07 11:33:36 +02:00
tests	execve: Move KUnit tests to tests/ subdirectory	2024-07-22 18:25:47 -07:00
tracefs	eventfs: Use list_del_rcu() for SRCU protected list variable	2024-09-05 10:18:48 -04:00
ubifs	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
udf	udf: fix uninit-value use in udf_get_fileshortad	2024-10-02 14:32:37 +02:00
ufs	ufs_rename(): fix bogus argument of folio_release_kmap()	2024-10-02 00:05:09 -04:00
unicode	unicode: add MODULE_DESCRIPTION() macros	2024-06-20 19:30:02 -04:00
vboxsf	fs: Convert aops->write_end to take a folio	2024-08-07 11:32:02 +02:00
verity	fsverity: expose verified fsverity built-in signatures to LSMs	2024-08-20 14:03:18 -04:00
xfs	xfs: skip background cowblock trims on inodes open for write	2024-10-07 08:00:12 +02:00
zonefs	zonefs fixes for 6.12-rc2	2024-10-02 12:02:15 -07:00
aio.c	fs/aio: Fix __percpu annotation of *cpu pointer in struct kioctx	2024-08-19 13:45:03 +02:00
anon_inodes.c	fs: Create anon_inode_getfile_fmode()	2024-04-26 10:33:05 +02:00
attr.c	nfsd-6.11 fixes:	2024-08-29 06:20:44 +12:00
backing-file.c	backing-file: convert to using fops->splice_write	2024-08-23 13:08:31 +02:00
bad_inode.c
binfmt_elf_fdpic.c	binfmt_elf_fdpic: fix AUXV size calculation when ELF_HWCAP2 is defined	2024-08-26 13:00:38 -07:00
binfmt_elf.c	Revert "binfmt_elf, coredump: Log the reason of the failed core dumps"	2024-09-26 11:39:02 -07:00
binfmt_flat.c	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
binfmt_misc.c	vfs-6.11.module.description	2024-07-15 11:14:59 -07:00
binfmt_script.c	fs: binfmt: add missing MODULE_DESCRIPTION() macros	2024-05-28 12:06:51 +02:00
bpf_fs_kfuncs.c	bpf: Add kfunc bpf_get_dentry_xattr() to read xattr from dentry	2024-08-07 11:26:54 -07:00
buffer.c	vfs-6.12.folio	2024-09-16 08:54:30 +02:00
char_dev.c
compat_binfmt_elf.c
coredump.c	Revert "binfmt_elf, coredump: Log the reason of the failed core dumps"	2024-09-26 11:39:02 -07:00
d_path.c
dax.c	iomap: constrain the file range passed to iomap_file_unshare	2024-10-03 10:22:28 +02:00
dcache.c	vfs-6.12.misc	2024-09-16 08:35:09 +02:00
direct-io.c	fs/direct-io: Remove linux/prefetch.h include	2024-08-19 13:45:02 +02:00
drop_caches.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
eventfd.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
eventpoll.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
exec.c	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
fcntl.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
fhandle.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
file_table.c	slab updates for 6.12	2024-09-18 08:53:53 +02:00
file.c	close_range(): fix the logics in descriptor table trimming	2024-09-29 21:52:29 -04:00
filesystems.c
fs_context.c
fs_parser.c	fs_parse: add uid & gid option option parsing helpers	2024-07-02 06:20:49 +02:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c	inode: port __I_SYNC to var event	2024-08-30 08:22:39 +02:00
fsopen.c	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
init.c
inode.c	bcachefs changes for 6.12-rc1	2024-09-23 10:05:41 -07:00
internal.h	file: reclaim 24 bytes from f_owner	2024-08-28 13:05:39 +02:00
ioctl.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
Kconfig	NFS Client Updates for Linux 6.12	2024-09-24 15:44:18 -07:00
Kconfig.binfmt	exec: Add KUnit test for bprm_stack_limits()	2024-06-19 13:13:55 -07:00
kernel_read_file.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
libfs.c	vfs-6.12.folio	2024-09-16 08:54:30 +02:00
locks.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
Makefile	bpf: introduce new VFS based BPF kfuncs	2024-08-06 09:01:41 -07:00
mbcache.c
mnt_idmapping.c	fuse update for 6.12	2024-09-24 15:29:42 -07:00
mount.h	vfs-6.12.mount	2024-09-16 11:15:26 +02:00
mpage.c	buffer: Remove calls to set and clear the folio error flag	2024-05-31 12:31:43 +02:00
namei.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
namespace.c	fuse update for 6.12	2024-09-24 15:29:42 -07:00
nsfs.c	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
open.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
pidfs.c	pidfs: check for valid pid namespace	2024-09-27 18:29:19 +02:00
pipe.c	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
pnode.c
pnode.h
posix_acl.c	fs: Use in_group_or_capable() helper to simplify the code	2024-08-30 08:22:37 +02:00
proc_namespace.c	fs: rename show_mnt_opts -> show_vfsmnt_opts	2024-06-28 14:36:43 +02:00
read_write.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
readdir.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
remap_range.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
select.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
seq_file.c	seq_file: Simplify __seq_puts()	2024-05-02 16:28:20 +02:00
signalfd.c	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
splice.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
stack.c
stat.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
statfs.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
super.c	vfs-6.12.misc	2024-09-16 08:35:09 +02:00
sync.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
sysctls.c
timerfd.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
userfaultfd.c	mm/hugetlb: remove hugetlb_follow_page_mask() leftover	2024-09-01 20:25:57 -07:00
utimes.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
xattr.c	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00