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887e97745ec336c2f49b6c0af3c4cc00a5df3211
linux/fs
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Mateusz Guzik 887e97745e fs: track the inode having file locks with a flag in ->i_opflags 
Opening and closing an inode dirties the ->i_readcount field.

Depending on the alignment of the inode, it may happen to false-share
with other fields loaded both for both operations to various extent.

This notably concerns the ->i_flctx field.

Since most inodes don't have the field populated, this bit can be managed
with a flag in ->i_opflags instead which bypasses the problem.

Here are results I obtained while opening a file read-only in a loop
with 24 cores doing the work on Sapphire Rapids. Utilizing the flag as
opposed to reading ->i_flctx field was toggled at runtime as the benchmark
was running, to make sure both results come from the same alignment.

before: 3233740
after:  3373346 (+4%)

before: 3284313
after:  3518711 (+7%)

before: 3505545
after:  4092806 (+16%)

Or to put it differently, this varies wildly depending on how (un)lucky
you get.

The primary bottleneck before and after is the avoidable lockref trip in
do_dentry_open().

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251203094837.290654-2-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-12-15 14:33:38 +01:00
..
9p
Merge tag '9p-for-6.19-rc1' of https://github.com/martinetd/linux
2025-12-07 08:29:09 -08:00
adfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
affs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
afs
Merge tag 'net-next-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2025-12-03 17:24:33 -08:00
autofs
Merge tag 'vfs-6.19-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-05 15:52:30 -08:00
befs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
bfs
Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:02:34 -08:00
btrfs
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2025-12-05 17:01:20 -08:00
cachefiles
Merge tag 'vfs-6.19-rc1.directory.locking' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 16:13:46 -08:00
ceph
Merge tag 'ceph-for-6.19-rc1' of https://github.com/ceph/ceph-client
2025-12-14 15:24:10 +12:00
coda
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
configfs
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
cramfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
crypto
Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-06 14:01:20 -08:00
debugfs
Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
2025-12-05 21:29:02 -08:00
devpts
convert devpts
2025-11-16 01:35:04 -05:00
dlm
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
ecryptfs
Merge tag 'vfs-6.19-rc1.directory.locking' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 16:13:46 -08:00
efivarfs
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
efs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
erofs
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2025-12-05 17:01:20 -08:00
exfat
exfat: fix remount failure in different process environments
2025-12-03 10:00:17 +09:00
exportfs
exportfs: use lookup_one_unlocked()
2025-06-11 13:44:15 +02:00
ext2
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
ext4
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
f2fs
Merge tag 'f2fs-for-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2025-12-09 12:06:20 +09:00
fat
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
freevxfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
fuse
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
gfs2
Merge tag 'gfs2-for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
2025-12-03 20:28:50 -08:00
hfs
Merge tag 'hfs-v6.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/vdubeyko/hfs
2025-12-03 20:08:32 -08:00
hfsplus
Merge tag 'hfs-v6.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/vdubeyko/hfs
2025-12-03 20:08:32 -08:00
hostfs
Merge tag 'uml-for-linux-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux
2025-12-05 16:30:56 -08:00
hpfs
Merge tag 'vfs-6.19-rc1.fs_header' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 14:18:01 -08:00
hugetlbfs
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
iomap
Merge tag 'vfs-6.19-rc1.folio' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 10:26:38 -08:00
isofs
Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:02:34 -08:00
jbd2
jbd2: fix the inconsistency between checksum and data in memory for journal sb
2025-11-26 17:05:47 -05:00
jffs2
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
jfs
Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:02:34 -08:00
kernfs
Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
2025-12-05 21:29:02 -08:00
lockd
Merge tag 'nfsd-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2025-12-06 10:57:02 -08:00
minix
Merge tag 'vfs-6.19-rc1.minix' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 15:22:40 -08:00
netfs
Merge tag 'vfs-6.19-rc1.folio' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 10:26:38 -08:00
nfs
Merge tag 'nfs-for-6.19-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2025-12-12 21:52:42 +12:00
nfs_common
NFS/localio: nfs_uuid_put() fix the wake up after unlinking the file
2025-08-05 16:45:40 -07:00
nfsd
Merge tag 'nfsd-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2025-12-06 10:57:02 -08:00
nilfs2
Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-06 14:01:20 -08:00
nls
fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8()
2025-12-01 11:58:06 +02:00
notify
Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 17:32:07 -08:00
ntfs3
Merge tag 'mm-stable-2025-12-03-21-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-05 13:52:43 -08:00
ocfs2
Merge tag 'mm-nonmm-stable-2025-12-11-11-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-13 20:55:12 +12:00
omfs
Merge tag 'vfs-6.19-rc1.fs_header' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 14:18:01 -08:00
openpromfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
orangefs
Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:02:34 -08:00
overlayfs
ovl: pass original credentials, not mounter credentials during create
2025-12-05 16:16:20 -08:00
proc
fs/proc: replace "__auto_type" with "const auto"
2025-12-08 15:32:15 -08:00
pstore
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
qnx4
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
qnx6
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
quota
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
ramfs
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
resctrl
Merge tag 'mm-stable-2025-12-03-21-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-05 13:52:43 -08:00
romfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
smb
Merge tag 'v6.19-rc-smb3-server-fixes' of git://git.samba.org/ksmbd
2025-12-12 21:59:19 +12:00
squashfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
sysfs
sysfs: attribute_group: enable const variants of is_visible()
2025-11-26 15:16:35 +01:00
tests
…
tracefs
convert tracefs
2025-11-16 01:35:03 -05:00
ubifs
Merge tag 'ubifs-for-linus-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
2025-12-09 08:50:27 +09:00
udf
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
ufs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
unicode
…
vboxsf
simplify vboxsf_dir_atomic_open()
2025-09-16 23:59:38 -04:00
verity
Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fsverity/linux
2025-09-29 15:55:20 -07:00
xfs
Merge tag 'xfs-merge-6.19' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
2025-12-03 20:19:38 -08:00
zonefs
Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:02:34 -08:00
aio.c
aio: use credential guards
2025-11-04 12:36:33 +01:00
anon_inodes.c
anon_inodes: convert to FD_ADD()
2025-11-28 12:42:31 +01:00
attr.c
filelock: add struct delegated_inode
2025-11-12 09:38:34 +01:00
backing-file.c
Merge tag 'kernel-6.19-rc1.cred' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 13:45:41 -08:00
bad_inode.c
…
binfmt_elf_fdpic.c
Merge tag 'execve-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-07-28 17:11:40 -07:00
binfmt_elf.c
rseq: Provide and use rseq_set_ids()
2025-11-04 08:33:33 +01:00
binfmt_flat.c
…
binfmt_misc.c
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf...d_path(): constify path argument
2025-09-15 21:17:08 -04:00
buffer.c
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
char_dev.c
fs: annotate cdev_lock with __cacheline_aligned_in_smp
2025-12-15 14:33:38 +01:00
compat_binfmt_elf.c
…
coredump.c
Merge tag 'net-next-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2025-12-03 17:24:33 -08:00
d_path.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
dax.c
Merge tag 'mm-stable-2025-12-03-21-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-05 13:52:43 -08:00
dcache.c
Merge tag 'fuse-update-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
2025-12-05 15:25:13 -08:00
direct-io.c
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
drop_caches.c
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
eventfd.c
eventfd: convert do_eventfd() to FD_PREPARE()
2025-11-28 12:42:31 +01:00
eventpoll.c
eventpoll: convert do_epoll_create() to FD_PREPARE()
2025-11-28 12:42:32 +01:00
exec.c
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
fcntl.c
vfs: expose delegation support to userland
2025-11-12 09:38:37 +01:00
fhandle.c
fhandle: convert do_handle_open() to FD_ADD()
2025-11-28 12:42:31 +01:00
file_attr.c
fs: remove spurious exports in fs/file_attr.c
2025-11-19 12:17:31 +01:00
file_table.c
fs: update comment in init_file()
2025-10-07 12:48:33 +02:00
file.c
Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 17:32:07 -08:00
filesystems.c
…
fs_context.c
change the calling conventions for vfs_parse_fs_string()
2025-09-04 15:20:51 -04:00
fs_dirent.c
fs: rename fs_types.h to fs_dirent.h
2025-11-05 09:51:30 +01:00
fs_parser.c
…
fs_pin.c
…
fs_struct.c
fs: inline current_umask() and move it to fs_struct.h
2025-11-05 22:51:23 +01:00
fs-writeback.c
Merge tag 'vfs-6.19-rc1.writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:20:51 -08:00
fsopen.c
fscontext: do not consume log entries when returning -EMSGSIZE
2025-08-11 14:52:41 +02:00
init.c
vfs: make vfs_symlink break delegations on parent dir
2025-11-12 09:38:36 +01:00
inode.c
fs: assert on I_FREEING not being set in iput() and iput_not_last()
2025-12-03 11:14:50 +01:00
internal.h
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
ioctl.c
fs: remove vfs_ioctl export
2025-09-01 13:08:01 +02:00
Kconfig
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
Kconfig.binfmt
binfmt_elf: preserve original ELF e_flags for core dumps
2025-09-03 20:49:32 -07:00
kernel_read_file.c
…
libfs.c
Merge tag 'pull-persistency' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-12-05 14:36:21 -08:00
locks.c
fs: track the inode having file locks with a flag in ->i_opflags
2025-12-15 14:33:38 +01:00
Makefile
fs: rename fs_types.h to fs_dirent.h
2025-11-05 09:51:30 +01:00
mbcache.c
…
mnt_idmapping.c
…
mount.h
fs: use boolean to indicate anonymous mount namespace
2025-11-11 10:01:31 +01:00
mpage.c
mpage: convert do_mpage_readpage() to return void type
2025-09-21 14:22:16 -07:00
namei.c
Merge tag 'vfs-6.19-rc1.directory.locking' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 16:13:46 -08:00
namespace.c
Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 17:32:07 -08:00
nsfs.c
Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 17:32:07 -08:00
open.c
Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 17:32:07 -08:00
pidfs.c
Merge tag 'vfs-6.19-rc1.coredump' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 10:17:39 -08:00
pipe.c
Merge tag 'sysctl-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl
2025-12-05 11:15:37 -08:00
pnode.c
umount_tree(): take all victims out of propagation graph at once
2025-09-15 21:26:44 -04:00
pnode.h
umount_tree(): take all victims out of propagation graph at once
2025-09-15 21:26:44 -04:00
posix_acl.c
filelock: add struct delegated_inode
2025-11-12 09:38:34 +01:00
proc_namespace.c
->mnt_devname is never NULL
2025-05-23 14:20:44 +02:00
read_write.c
copy_file_range: limit size if in compat mode
2025-08-15 16:11:47 +02:00
readdir.c
readdir: supply dir_context.count as readdir buffer size hint
2025-05-29 12:31:23 +02:00
remap_range.c
…
select.c
select: Convert to scoped user access
2025-11-04 08:28:34 +01:00
seq_file.c
…
signalfd.c
signalfd: convert do_signalfd4() to FD_ADD()
2025-11-28 12:42:32 +01:00
splice.c
fs: use min() or umin() instead of min_t()
2025-12-15 14:33:37 +01:00
stack.c
docs/vfs: update references to i_mutex to i_rwsem
2025-06-23 12:17:33 +02:00
stat.c
constify path argument of vfs_statx_path()
2025-09-15 21:17:07 -04:00
statfs.c
…
super.c
Merge tag 'vfs-6.19-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-05 15:52:30 -08:00
sync.c
Merge tag 'vfs-6.19-rc1.writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 09:20:51 -08:00
sysctls.c
…
timerfd.c
timerfd: convert timerfd_create() to FD_ADD()
2025-11-28 12:42:32 +01:00
userfaultfd.c
Merge tag 'mm-stable-2025-12-03-21-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-12-05 13:52:43 -08:00
utimes.c
Merge tag 'vfs-6.19-rc1.directory.delegations' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-12-01 15:34:41 -08:00
xattr.c
filelock: add struct delegated_inode
2025-11-12 09:38:34 +01:00