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ea3085dd7a
linux/fs
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Suren Baghdasaryan ea3085dd7a fs/proc/task_mmu: read proc/pid/{smaps|numa_maps} under per-vma lock 
Patch series "use vma locks for proc/pid/{smaps|numa_maps} reads", v2.

Use per-vma locks when reading /proc/pid/smaps and /proc/pid/numa_maps
similar to /proc/pid/maps to reduce contention on central mmap_lock.  One
major difference between maps and smaps/numa_maps reading is that the
latter executes page table walk which can't be done under RCU due to a
possibility of sleeping.  Therefore we drop RCU read lock before this walk
while keeping the VMA locked.  After the walk we retake RCU read lock,
reset VMA iterator and proceed with the next VMA.

The last two patches extend /proc/pid/maps test to cover /proc/pid/smaps
reading during concurrent address space modification.


This patch (of 3):

proc/pid/{smaps|numa_maps} can be read using the combination of RCU and
VMA read locks, similar to proc/pid/maps.  RCU is required to safely
traverse the VMA tree and VMA lock stabilizes the VMA being processed and
the pagetable walk.

Link: https://lore.kernel.org/20260426062718.1238437-1-surenb@google.com
Link: https://lore.kernel.org/20260426062718.1238437-2-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Liam R. Howlett <liam@infradead.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-06-04 14:45:05 -07:00
..
9p netfs: Fix potential for tearing in ->remote_i_size and ->zero_point 2026-05-12 14:42:30 +02:00
adfs ARM development for 7.1-rc1 2026-04-25 07:44:26 -07:00
affs Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
afs afs: Fix the locking used by afs_get_link() 2026-05-12 14:42:33 +02:00
autofs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
befs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
bfs vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
btrfs for-7.1-rc4-tag 2026-05-23 16:54:48 -07:00
cachefiles cachefiles: Fix error return when vfs_mkdir() fails 2026-05-15 15:32:43 +02:00
ceph ceph: put folios not suitable for writeback 2026-05-11 10:39:22 +02:00
coda coda cleanups and fixes 2026-04-21 14:03:10 -07:00
configfs Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cramfs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
crypto fscrypt updates for 7.1 2026-04-13 17:29:12 -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 ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs 2026-03-29 11:21:22 -07:00
ecryptfs eCryptfs changes for 7.1-rc1 2026-04-20 10:54:17 -07:00
efivarfs efivarfs: use QSTR() in efivarfs_alloc_dentry 2026-04-28 12:30:59 +02:00
efs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
erofs erofs: fix metabuf leak in inode xattr initialization 2026-05-20 14:53:14 +08:00
exfat Description for this pull request: 2026-04-13 16:57:31 -07:00
exportfs Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
ext2 \n 2026-04-15 19:22:16 -07:00
ext4 Various clean ups and bug fixes in ext4 for 7.1: 2026-04-17 17:08:31 -07:00
f2fs f2fs-for-7.1-rc1 2026-04-21 14:50:04 -07:00
fat vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
freevxfs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
fuse fuse: fix writeback array overflow when max_pages is one 2026-05-11 14:19:01 +02:00
gfs2 gfs2 changes 2026-04-15 19:12:04 -07:00
hfs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
hfsplus hfs/hfsplus updates for v7.1 2026-04-13 16:50:38 -07:00
hostfs Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hpfs hpfs: fix a crash if hpfs_map_dnode_bitmap fails 2026-05-25 14:48:58 +02:00
hugetlbfs Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare" 2026-05-21 19:06:11 -07:00
iomap block: pass a minsize argument to bio_iov_iter_bounce 2026-05-13 13:55:06 -06:00
isofs isofs: use QSTR_LEN() in isofs_cmp 2026-04-20 17:27:28 +02:00
jbd2 Various clean ups and bug fixes in ext4 for 7.1: 2026-04-17 17:08:31 -07:00
jffs2 treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
jfs fs: Fix return in jfs_mkdir and orangefs_mkdir 2026-05-11 14:19:01 +02:00
kernfs Driver core changes for 7.1-rc1 2026-04-13 19:03:11 -07:00
lockd NFSD 7.1 Release Notes 2026-04-20 10:44:02 -07:00
minix vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
netfs netfs, afs: Fix write skipping in dir/link writepages 2026-05-12 14:42:32 +02:00
nfs NFS client updates for Linux 7.1 2026-04-24 14:20:03 -07:00
nfs_common NFSD: Remove NFSERR_EAGAIN 2026-01-02 13:43:41 -05:00
nfsd nfsd-7.1 fixes: 2026-05-15 13:11:41 -07:00
nilfs2 mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
nls fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8() 2025-12-01 11:58:06 +02:00
notify \n 2026-04-27 16:40:24 -07:00
ntfs ntfs: restore $MFT mirror contents check 2026-05-11 23:30:48 +09:00
ntfs3 Changes for 7.1-rc1 2026-04-20 10:59:47 -07:00
ocfs2 Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
omfs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
openpromfs
orangefs fs: Fix return in jfs_mkdir and orangefs_mkdir 2026-05-11 14:19:01 +02:00
overlayfs ovl: fix verity lazy-load guard broken by fsverity_active() semantic change 2026-05-06 08:37:30 -07:00
proc fs/proc/task_mmu: read proc/pid/{smaps|numa_maps} under per-vma lock 2026-06-04 14:45:05 -07:00
pstore mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
qnx4 vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
qnx6 vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
quota quota: Fix race of dquot_scan_active() with quota deactivation 2026-03-25 13:15:36 +01:00
ramfs folio_batch: rename pagevec.h to folio_batch.h 2026-04-05 13:53:07 -07:00
resctrl mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
romfs mm.git review status for linus..mm-stable 2026-02-18 20:50:32 -08:00
smb three ksmbd server fixes 2026-05-23 16:59:02 -07:00
squashfs Squashfs: check metadata block offset is within range 2026-02-24 11:13:27 -08:00
sysfs sysfs: don't remove existing directory on update failure 2026-05-20 17:13:20 +02:00
tests fs/tests: exec: Remove bad test vector 2026-03-18 11:41:53 -07:00
tracefs tracefs fixes for v7.1: 2026-04-22 15:09:01 -07:00
ubifs mm.git review status for linus..mm-nonmm-stable 2026-04-16 20:11:56 -07:00
udf udf: reject descriptors with oversized CRC length 2026-04-22 17:14:48 +02:00
ufs vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
unicode Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vboxsf Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
verity vfs-7.1-rc1.kino 2026-04-13 12:19:01 -07:00
xfs xfs: fix a buffer lookup against removal race 2026-05-21 13:43:58 +02:00
zonefs zonefs: handle integer overflow in zonefs_fname_to_fno 2026-05-12 07:53:20 +09:00
aio.c fs: aio: reject partial mremap to avoid Null-pointer-dereference error 2026-04-24 00:34:59 +02:00
anon_inodes.c anon_inodes: convert to FD_ADD() 2025-11-28 12:42:31 +01:00
attr.c fs: attr: fix comment formatting and spelling issues 2026-04-07 11:26:11 +02:00
backing-file.c lsm: add backing_file LSM hooks 2026-04-03 16:53:50 -04:00
bad_inode.c fs: refactor ->update_time handling 2026-01-12 14:01:32 +01:00
binfmt_elf_fdpic.c vfs-7.1-rc1.kino 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 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
binfmt_script.c
bpf_fs_kfuncs.c bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs 2026-01-02 12:04:28 -08:00
buffer.c vfs-7.1-rc1.fixes 2026-04-23 17:08:04 -07:00
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 vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
d_path.c dcache: permit dynamic_dname()s up to NAME_MAX 2026-04-07 12:32:22 +02:00
dax.c dax changes for 7.1 2026-04-21 14:12:01 -07:00
dcache.c Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
direct-io.c
drop_caches.c
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: drop vestigial epi->dying flag 2026-04-24 00:37:01 +02:00
exec.c exec: use strnlen() in __set_task_comm 2026-04-01 12:26:07 -07:00
fcntl.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
fhandle.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
file_attr.c vfs-7.0-rc2.fixes 2026-02-25 10:34:23 -08:00
file_table.c lsm/stable-7.1 PR 20260410 2026-04-13 15:17:28 -07:00
file.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
filesystems.c sysfs(2): fs_index() argument is _not_ a pathname 2026-01-16 12:52:04 -05:00
fs_context.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
fs_dirent.c
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 vfs-7.1-rc1.fixes 2026-04-23 17:08:04 -07:00
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 struct filename series 2026-02-09 16:58:28 -08:00
inode.c fs: fix forced iversion increment on lazytime timestamp updates 2026-05-11 15:32:12 +02:00
internal.h lsm/stable-7.1 PR 20260410 2026-04-13 15:17:28 -07:00
ioctl.c
Kconfig ntfs: add Kconfig and Makefile 2026-02-19 21:51:00 +09:00
Kconfig.binfmt
kernel_read_file.c
libfs.c vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
locks.c NFSD 7.1 Release Notes 2026-04-20 10:44:02 -07:00
Makefile userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c 2026-06-04 14:45:03 -07:00
mbcache.c vfs-7.1-rc1.misc 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 fs: add immutable rootfs 2026-01-12 16:52:09 +01:00
mpage.c mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
namei.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
namespace.c mount: always duplicate mount 2026-04-14 09:30:15 +02:00
nsfs.c nsfs: fix wrong error code returned for pidns ioctls 2026-05-11 15:59:14 +02:00
nullfs.c fs: add immutable rootfs 2026-01-12 16:52:09 +01:00
open.c fs: remove do_sys_truncate 2026-03-23 12:41:58 +01:00
pidfs.c vfs-7.1-rc1.pidfs 2026-04-13 13:27:11 -07:00
pipe.c treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
pnode.c
pnode.h
posix_acl.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
proc_namespace.c
read_write.c fs: add setlease to generic_ro_fops and read-only filesystem directory operations 2026-01-12 10:55:45 +01:00
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 fs/select: reject negative timeval components in kern_select() 2026-05-12 14:41:40 +02:00
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 statx: switch to CLASS(filename_maybe_null) 2026-01-16 12:52:04 -05:00
statfs.c user_statfs(): switch to CLASS(filename) 2026-01-16 12:52:04 -05:00
super.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sync.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
sysctls.c
timerfd.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
utimes.c do_utimes_path(): switch to CLASS(filename_uflags) 2026-01-16 12:52:03 -05:00
xattr.c xattr: support extended attributes on sockets 2026-03-02 11:06:42 +01:00