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cb6a7cc2bd7bb361c313a785eb76edc60de7bdce
linux/fs
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Breno Leitao f7f4665dc5 fs/pipe: unify the page pools into a single per-pipe pool 
Pipes keep two separate page caches:
 a) The per-pipe, lock-protected tmp_page[2]
 b) An on-stack anon_pipe_prealloc burst pool of up to eight pages
    filled before the lock

Converge them into a single per-pipe pool (struct anon_pipe_prealloc
embedded in pipe_inode_info) with the same budget as before: up to
PIPE_PREALLOC_MAX (8) pages, trimmed back to PIPE_PREALLOC_KEEP (2)
after each operation. tmp_page[2] is removed.

Pages are still allocated and freed outside pipe->mutex; only the
assignment into the pool is done under it. The pool count is also read
locklessly in the prefill path, so it is annotated __data_racy.

anon_pipe_prefill_and_lock() tops the pool up to the write's page count
-- and returns with pipe->mutex held, so a write acquires the lock only
once.

anon_pipe_trim_and_unlock() trims the pool under that same lock before
dropping it, then frees the excess.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260720-b4-pipe-unification-v5-1-9002a3fe5e6d@debian.org
Reviewed-by: Mateusz Guzik <mjguzik@gmail.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
2026-07-31 10:09:11 +02:00
..
9p
9p: drop redundant S_IFDIR from mkdir
2026-07-01 12:47:23 +02:00
adfs
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux
2026-04-25 07:44:26 -07:00
affs
affs: Move long delayed work on system_dfl_long_wq
2026-07-31 10:09:07 +02:00
afs
afs: drop redundant S_IFDIR from mkdir
2026-07-01 12:48:41 +02:00
autofs
autofs: drop redundant S_IFDIR from mkdir
2026-07-01 12:48:44 +02:00
befs
befs: handle set_blocksize failures
2026-05-21 13:39:35 +02:00
bfs
bfs: replace get_zeroed_page() with kzalloc()
2026-05-28 13:58:14 +02:00
btrfs
btrfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:48:48 +02:00
cachefiles
cachefiles: Fix error return when vfs_mkdir() fails
2026-05-15 15:32:43 +02:00
ceph
ceph: drop redundant S_IFDIR from mkdir
2026-07-01 12:48:51 +02:00
coda
vfs: pass S_IFDIR mode to vfs_prepare_mode()
2026-07-01 12:47:13 +02:00
configfs
Merge tag 'pull-configfs-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-06-15 04:28:20 +05:30
cramfs
cramfs: drop obsolete Future Development notes and update tools URL
2026-05-03 09:12:23 -06:00
crypto
fscrypt: Replace mk_users keyring with simple list
2026-06-22 12:12:11 -07:00
debugfs
debugfs: fix placement of EXPORT_SYMBOL_GPL for debugfs_create_str()
2026-04-02 16:15:23 +02:00
devpts
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
dlm
dlm: init per node debugfs before add to node hash
2026-05-08 08:38:03 -05:00
ecryptfs
Merge tag 'ecryptfs-7.2-rc1-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
2026-06-26 08:24:06 -07:00
efivarfs
efivarfs: use QSTR() in efivarfs_alloc_dentry
2026-04-28 12:30:59 +02:00
efs
fs: efs: remove unneeded debug prints
2026-06-11 11:42:21 -07:00
erofs
erofs: handle 48-bit blocks_hi for compressed inodes
2026-06-22 18:50:36 +08:00
exfat
exfat: bound uniname advance in exfat_find_dir_entry()
2026-06-15 20:01:04 +09:00
exportfs
find_acceptable_alias(): skip NORCU aliases with zero refcount
2026-06-05 00:34:55 -04:00
ext2
ext2: drop redundant S_IFDIR from mkdir
2026-07-01 12:49:36 +02:00
ext4
ext4: drop redundant S_IFDIR from mkdir
2026-07-01 12:49:40 +02:00
f2fs
f2fs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:09 +02:00
fat
Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-06-21 13:20:19 -07:00
freevxfs
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
fuse
vfs: pass S_IFDIR mode to vfs_prepare_mode()
2026-07-01 12:47:13 +02:00
gfs2
gfs2: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:13 +02:00
hfs
hfs: Move long delayed work on system_dfl_long_wq
2026-07-31 10:09:07 +02:00
hfsplus
hfsplus: Move long delayed work on system_dfl_long_wq
2026-07-31 10:09:07 +02:00
hostfs
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
hpfs
hpfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:22 +02:00
hugetlbfs
hugetlbfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:25 +02:00
iomap
iomap: always return status from iomap_write_iter
2026-06-29 10:27:27 +02:00
isofs
Merge tag 'fs_for_v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2026-06-16 11:58:52 +05:30
jbd2
Merge tag 'ext4_for_linus-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2026-06-18 09:42:02 -07:00
jffs2
fs/jffs2: Move long delayed work on system_dfl_long_wq
2026-07-31 10:09:07 +02:00
jfs
jfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:32 +02:00
kernfs
Merge tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core
2026-06-15 12:41:17 +05:30
lockd
lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()
2026-06-09 16:32:59 -04:00
minix
minix: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:36 +02:00
netfs
netfs, afs: Fix write skipping in dir/link writepages
2026-05-12 14:42:32 +02:00
nfs
nfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:13 +02:00
nfs_common
NFSD: Remove NFSERR_EAGAIN
2026-01-02 13:43:41 -05:00
nfsd
Merge tag 'nfsd-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2026-06-18 09:14:15 -07:00
nilfs2
nilfs2: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:39 +02:00
nls
fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8()
2025-12-01 11:58:06 +02:00
notify
Merge tag 'fsnotify_for_v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2026-06-16 11:56:43 +05:30
ntfs
ntfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:23 +02:00
ntfs3
ntfs3: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:42 +02:00
ocfs2
ocfs2: dlmfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:49 +02:00
omfs
omfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:52 +02:00
openpromfs
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
orangefs
orangefs: drop redundant S_IFDIR from mkdir
2026-07-01 12:50:55 +02:00
overlayfs
ovl: keep err zero after successful ovl_cache_get()
2026-05-18 14:56:15 +02:00
proc
Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-06-21 13:20:19 -07:00
pstore
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
qnx4
qnx4: handle set_blocksize failures
2026-05-21 13:39:35 +02:00
qnx6
fs/qnx6: fix pointer arithmetic in directory iteration
2026-05-28 14:16:33 +02:00
quota
quota: allocate dquot_hash with kmalloc()
2026-05-27 15:12:22 +02:00
ramfs
ramfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:01 +02:00
resctrl
fs/resctrl: Continue counter allocation after failure
2026-05-08 12:07:43 +02:00
romfs
romfs: detect hard link cycles
2026-07-31 10:09:06 +02:00
smb
vfs: pass S_IFDIR mode to vfs_prepare_mode()
2026-07-01 12:47:13 +02:00
squashfs
Squashfs: check metadata block offset is within range
2026-02-24 11:13:27 -08:00
sysfs
Merge tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core
2026-06-15 12:41:17 +05:30
tests
fs/tests: exec: Remove bad test vector
2026-03-18 11:41:53 -07:00
tracefs
tracefs: use d_splice_alias() in ->lookup() instances
2026-06-05 01:12:15 -04:00
ubifs
ubifs: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:16 +02:00
udf
udf: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:04 +02:00
ufs
ufs: Move long delayed work on system_dfl_long_wq
2026-07-31 10:09:06 +02:00
unicode
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
vboxsf
vboxsf: Implement fileattr_get for case sensitivity
2026-05-11 16:50:29 +02:00
verity
Merge tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2026-06-17 09:18:14 +01:00
xfs
xfs: drop redundant S_IFDIR from mkdir
2026-07-01 12:51:20 +02:00
zonefs
zonefs: handle integer overflow in zonefs_fname_to_fno
2026-05-12 07:53:20 +09:00
aio.c
libfs: drop redundant SB_I_NOEXEC/SB_I_NODEV in init_pseudo() callers
2026-06-04 10:10:49 +02:00
anon_inodes.c
libfs: drop redundant SB_I_NOEXEC/SB_I_NODEV in init_pseudo() callers
2026-06-04 10:10:49 +02:00
attr.c
filelock: add support for ignoring deleg breaks for dir change events
2026-05-15 19:24:32 +02:00
backing-file.c
backing-file: fix backing_file_open() kerneldoc parameter
2026-06-10 09:49:25 +02:00
bad_inode.c
fs: refactor ->update_time handling
2026-01-12 14:01:32 +01:00
binfmt_elf_fdpic.c
Merge tag 'vfs-7.1-rc1.kino' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:19:01 -07:00
binfmt_elf.c
mm: unexport vm_brk_flags() and eliminate vm_flags parameter
2026-04-05 13:53:39 -07:00
binfmt_flat.c
…
binfmt_misc.c
binfmt_misc: replace __get_free_page() with kmalloc()
2026-05-28 13:58:14 +02:00
binfmt_script.c
…
bpf_fs_kfuncs.c
Merge tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2026-06-17 09:18:14 +01:00
buffer.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
char_dev.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
compat_binfmt_elf.c
…
coredump.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
d_path.c
dcache: permit dynamic_dname()s up to NAME_MAX
2026-04-07 12:32:22 +02:00
dax.c
Merge tag 'libnvdimm-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2026-04-21 14:12:01 -07:00
dcache.c
Merge tag 'pull-dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-06-15 04:15:31 +05:30
direct-io.c
direct-io: remove IOCB_NOWAIT support
2026-05-26 11:01:55 -06:00
drop_caches.c
Coccinelle-based conversion to use ->i_state accessors
2025-10-20 20:22:26 +02:00
eventfd.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
eventpoll.c
eventpoll: compute timer slack lazily in ep_poll()
2026-07-31 10:09:11 +02:00
exec.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
fcntl.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
fhandle.c
fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()
2026-06-04 09:39:50 +02:00
file_attr.c
fs: Add case sensitivity flags to file_kattr
2026-05-11 16:50:27 +02:00
file_table.c
Merge tag 'pull-dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-06-15 04:15:31 +05:30
file.c
fs: retire stale comment in fget_task_next()
2026-05-28 14:27:00 +02:00
filesystems.c
fs: fix ups and tidy ups to /proc/filesystems caching
2026-06-12 14:26:27 +02:00
fs_context.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
fs_dirent.c
fs: rename fs_types.h to fs_dirent.h
2025-11-05 09:51:30 +01:00
fs_parser.c
fs: remove fsparam_path / fs_param_is_path
2026-02-19 14:34:26 +01:00
fs_pin.c
…
fs_struct.c
fs: add <linux/init_task.h> for 'init_fs'
2026-01-14 16:50:37 +01:00
fs-writeback.c
mm: kick writeback flusher for IOCB_DONTCACHE with targeted dirty tracking
2026-06-04 10:16:51 +02:00
fserror.c
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
fsopen.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
init.c
Merge tag 'pull-filename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-02-09 16:58:28 -08:00
inode.c
fs: annotate inode timestamp accessors
2026-07-31 10:09:11 +02:00
internal.h
fuse: invalidate page cache after DIO and async DIO writes
2026-06-15 14:06:20 +02:00
ioctl.c
…
Kconfig
treewide: fix indentation and whitespace in Kconfig files
2026-05-28 21:24:42 -07:00
Kconfig.binfmt
…
kernel_read_file.c
…
libfs.c
Merge tag 'pull-d_add' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-06-15 04:21:00 +05:30
locks.c
filelock: add an inode_lease_ignore_mask helper
2026-05-15 19:24:32 +02:00
Makefile
userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c
2026-06-04 14:45:03 -07:00
mbcache.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
mnt_idmapping.c
fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap
2026-05-11 14:19:01 +02:00
mount.h
Merge tag 'vfs-7.2-rc1.procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 04:07:58 +05:30
mpage.c
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
namei.c
vfs: pass S_IFDIR mode to vfs_prepare_mode()
2026-07-01 12:47:13 +02:00
namespace.c
put_mnt_ns(): leave mounts connected
2026-07-31 10:09:09 +02:00
nsfs.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
nullfs.c
fs: nullfs should include mount.h
2026-06-29 10:27:27 +02:00
open.c
Merge tag 'mm-stable-2026-06-23-08-55' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-06-23 12:03:44 -07:00
pidfs.c
Merge tag 'fsnotify_for_v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2026-06-16 11:56:43 +05:30
pipe.c
fs/pipe: unify the page pools into a single per-pipe pool
2026-07-31 10:09:11 +02:00
pnode.c
…
pnode.h
…
posix_acl.c
posix_acl: remove useless code
2026-06-30 12:48:38 +02:00
proc_namespace.c
…
read_write.c
fs/read_write: Do not export __kernel_write() to the entire world
2026-06-05 14:46:20 +02:00
readdir.c
fs: Replace user_access_{begin/end} by scoped user access
2026-03-24 14:44:02 +01:00
remap_range.c
…
select.c
Merge tag 'vfs-7.2-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-06-15 03:59:45 +05:30
seq_file.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
signalfd.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
splice.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
stack.c
…
stat.c
fs: annotate inode timestamp accessors
2026-07-31 10:09:11 +02:00
statfs.c
user_statfs(): switch to CLASS(filename)
2026-01-16 12:52:04 -05:00
super.c
fs/super: skip non-memcg-aware nr_cached_objects in memcg slab shrink
2026-06-29 10:27:29 +02:00
sync.c
sync_file_range: delete dead S_ISLNK code
2026-05-21 13:39:36 +02:00
sysctls.c
…
timerfd.c
fs/timerfd: Use the new alarm/hrtimer functions
2026-05-01 21:36:13 +02:00
utimes.c
do_utimes_path(): switch to CLASS(filename_uflags)
2026-01-16 12:52:03 -05:00
xattr.c
Merge tag 'lsm-pr-20260615' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
2026-06-17 12:34:16 +01:00