kernel/git/next/linux-next.git/tools/mm, branch master

tools/mm/page_owner_sort: show available sort keys in usage text

2026-09-04T00:38:31+00:00

The --sort option accepts abbreviated or complete key names, but the usage text never listed them. Users had to read the source or the documentation to discover valid keys. List all available keys (full form and abbreviation) with a brief description and examples directly in the --sort help section. Link: https://lore.kernel.org/20260819021611.2910835-4-ye.liu@linux.dev Signed-off-by: Ye Liu Acked-by: David Hildenbrand (Arm) Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Yichong Chen Cc: Liu Jing Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: add module name sort/cull/filter support

2026-09-04T00:38:30+00:00

Page owner stack traces already contain kernel module names in the "[module]" format produced by %pS, but page_owner_sort has no way to sort, cull, or filter by module. Extract the first module name from each record's stack trace using the regex \[([a-zA-Z0-9_]+)\]. Records whose stack traces contain no module frames are assigned "vmlinux". New options: -M Sort by module name --sort=mod Sort by module name (supports +/- prefix) --cull=mod Cull (aggregate) by module name --module Filter to records matching the given module(s) The module field is also printed in cull output when relevant. Link: https://lore.kernel.org/20260819021611.2910835-3-ye.liu@linux.dev Signed-off-by: Ye Liu Cc: David Hildenbrand (Arm) Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Liu Jing Cc: Yichong Chen Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: fix --sort option being silently ignored

2026-09-04T00:38:30+00:00

Patch series "tools/mm/page_owner_sort: fix --sort, add module filter, improve usage", v3. This series improves the page_owner_sort tool with a bug fix, a new module-name feature, and better usage text. Patch 1 fixes a long-standing bug where --sort was silently ignored when used without a short option (-a, -m, -p, etc.). The COMP_NO_FLAG case fell through to COMP_NUM and overwrote the sort conditions configured by parse_sort_args(). Patch 2 adds kernel module name support for sort, cull, and filter operations. Page owner stack traces already contain module names in the "function+0xNN/0xNN [module]" format produced by %pS, but page_owner_sort had no way to use them. Records without module frames are assigned "vmlinux". # Aggregate page usage per module ./page_owner_sort input.txt output.txt --cull=mod # Filter to records from xfs module only ./page_owner_sort input.txt output.txt --module xfs # Sort by module name, then by pid descending ./page_owner_sort input.txt output.txt --sort=mod,-pid Patch 3 lists all available sort keys with abbreviations and examples directly in the --sort help section so users no longer need to read the source to discover valid keys. This patch (of 3): When --sort is used without any short option (-a, -m, -p, etc.), compare_flag remains COMP_NO_FLAG. The switch (compare_flag) then falls through to the COMP_NUM case and calls set_single_cmp(), which unconditionally overwrites the sort conditions that parse_sort_args() already configured. This makes --sort silently ineffective unless a short option is also supplied. Split COMP_NO_FLAG out of the COMP_NUM fallthrough so that --sort is respected when no short option is present. Reproduction: # Before fix: ascending order (ignored --sort=-pid) ./page_owner_sort --sort=-pid input.txt output.txt # After fix: descending order as expected Link: https://lore.kernel.org/20260819021611.2910835-1-ye.liu@linux.dev Link: https://lore.kernel.org/20260819021611.2910835-2-ye.liu@linux.dev Signed-off-by: Ye Liu Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Liu Jing Cc: Yichong Chen Signed-off-by: Andrew Morton

Merge tag 'mm-nonmm-stable-2026-08-22-16-57' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-08-23T15:07:11+00:00

Pull non-MM updates from Andrew Morton: - "ocfs2/dlm: bound peer-controlled lengths in the o2dlm" (Bryam Vargas) Validate and bound all input lengths and count fields in the o2dlm migration and recovery receive handlers to prevent memory corruption and kernel panics from malformed cluster messages - "ocfs2: validate xattr entry bounds" (Cen Zhang) Validate OCFS2 extended attribute entry name and value bounds during metadata reads to prevent out-of-range memory accesses during retrieval or listing operations. - "taskstats: fix cgroupstats invalid fd handling and add selftests" (Yiyang Chen) Return -EBADF when cgroupstats receives an invalid file descriptor to prevent caller hangs and misleading success ACKs. Add a kselftest to validate valid cgroup v1 queries and verify proper error handling across different Netlink flag combinations. - "misc lib/raid/ improvements v2" (Christoph Hellwig) Improve benchmark-based algorithm selection for the XOR and RAID6 libraries, add KUnit benchmark tests, and cleanup minor implementation details. - "ocfs2: cluster: o2hb_region_pin() fixes" (Joseph Qi) Fix sleeping-in-atomic, lock order inversion and error-path cleanup bugs in o2hb_region_pin() by releasing o2hb_live_lock across sleeping configfs_depend_item() calls and using unlocked variants from callback context. Ensure failed pin attempts properly decrement user counts and unpin partially initialized heartbeat regions to prevent memory leaks and unprotected states. - "lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()" (Vincent Mailhol) Fix an off-by-one which could cause an out-of-bounds read. - "ocfs2: harden heartbeat teardown races" (Cen Zhang) Fix two OCFS2 heartbeat/o2net teardown races found by KASAN. - "taskstats: tidy up the cpumask command path" *Bradley Morgan) make two small cleanups in kernel/taskstats.c. - "ocfs2: validate active orphan slots during inode read" (ZhengYuan Huang) Validate active ordinary and append-DIO orphan slots read from OCFS2 dinodes at the metadata boundary to prevent corrupted slot indices from causing out-of-bounds array accesses. - "ocfs2: bound-check both readdir re-validation scans" (Zhan Xusheng) Enforce strict boundary checks on directory entry record lengths and offset calculations during OCFS2 directory re-scans to prevent out-of-bounds memory reads and directory position corruption. * tag 'mm-nonmm-stable-2026-08-22-16-57' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (95 commits) mailmap: fix bouncing address for Taniya Das ocfs2: bound-check dir entries in the inline-data re-validation scan ocfs2: bound-check dir entries in the readdir re-validation scan squashfs: avoid thundering-herd cache wakeups prctl: fix PR_SET_MM_AUXV losing the forced AT_NULL terminator mailmap: update email address for Linfeng Sun lib/interval_tree: fix allocation warning messages checkpatch: add NOKPROBE_SYMBOL to the whitelist of lines that can occur immediately after functions Squashfs: check block offset is not negative signal: factor out the kernel reserved si_code check ocfs2: fix readdir position truncation on 32-bit kernels ocfs2: fix cached cluster count after suballocator reclaim ocfs2: fix circular locking dependency in ocfs2_init_acl() ocfs2: validate DIO orphan slot during inode read ocfs2: validate orphan slot during inode read selftests/prctl: fix non-anonymous VMA mapping in set-anon-vma-name test MAINTAINERS: add IRC and patchwork for LTP include/linux/list.h: mark list_add and __list_add as __always_inline tools/mm: prevent page_owner_sort from truncating input hung_task: update DETECT_HUNG_TASK_BLOCKER Kconfig help ...

tools/mm: prevent page_owner_sort from truncating input

2026-08-13T22:42:06+00:00

page_owner_sort opens the output file with "w" before reading the input. If both paths refer to the same file, this truncates the input and the tool silently processes zero records before returning success. Delay opening the output file until all input records have been loaded into memory. This allows the tool to sort a file in place without truncating data before it has been consumed. Link: https://lore.kernel.org/20260730015809.3819606-1-warren.xiong@ugreen.com Signed-off-by: Warren Xiong Reviewed-by: Andrew Morton Cc: Vishal Moola Cc: Ye Liu Cc: Zhen Ni Cc: Zi Yan Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: bound pattern output copies

2026-07-31T02:40:50+00:00

search_pattern() copies a regex capture into caller-provided buffers without knowing their sizes. Several callers pass fixed-size buffers, including FIELD_BUFF and TASK_COMM_LEN. Pass the destination size to search_pattern(), reject captures that do not fit before copying them, and terminate the output string inside search_pattern(). Link: https://lore.kernel.org/20260629014316.130307-4-chenyichong@uniontech.com Signed-off-by: Yichong Chen Cc: Vishal Moola Cc: Ye Liu Cc: Zhen Ni Cc: Zi Yan Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: free per-record allocations

2026-07-31T02:40:50+00:00

add_list() allocates comm and txt for each page owner record, but the cleanup path only frees the outer list array. This leaks both buffers for every retained record. Free partial allocations in add_list(), discarded records during culling, and retained records on exit. Link: https://lore.kernel.org/20260629014316.130307-3-chenyichong@uniontech.com Signed-off-by: Yichong Chen Reviewed-by: Vishal Moola Cc: Ye Liu Cc: Zhen Ni Cc: Zi Yan Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: return explicit filter results

2026-07-31T02:40:49+00:00

Patch series "tools/mm/page_owner_sort: fix filtering and cleanup issues", v5. Patch 1 renames is_need() to filter_record() and makes the filter path return explicit results. Patch 2 fixes the per-record allocation leaks. Patch 3 bounds search_pattern() output copies, addressing the pre-existing issue reported by Sashiko/AI review. This patch (of 3): Rename is_need() to filter_record() and make the filter path return explicit error, skip, and match results. This lets callers distinguish allocation failures from records that simply do not match active filters. Link: https://lore.kernel.org/20260629014316.130307-1-chenyichong@uniontech.com Link: https://lore.kernel.org/20260629014316.130307-2-chenyichong@uniontech.com Signed-off-by: Yichong Chen Reviewed-by: Vishal Moola Cc: Ye Liu Cc: Zhen Ni Cc: Zi Yan Signed-off-by: Andrew Morton

tools/mm: add page_owner_filter userspace tool

2026-07-29T04:11:54+00:00

Add a userspace filtering tool for page_owner that supports per-fd filtering with print_mode and NUMA node filters. Features: - Three print modes: stack (default), handle, stack_handle - NUMA node filtering with flexible formats (single: 0, multiple: 0,1,2, range: 0-3, mixed: 0,2-3) - Per-file-descriptor filter state for independent filtering Usage examples: # Filter by print mode ./page_owner_filter -m handle ./page_owner_filter -m stack_handle # Filter by NUMA node ./page_owner_filter -n 0 ./page_owner_filter -n 0-3 # Combined filters ./page_owner_filter -m stack -n 0,1,2 ./page_owner_filter -m handle -n 0,2-3 The tool validates inputs before sending commands to the kernel and provides clear error messages when the kernel does not support per-fd filtering. Link: https://lore.kernel.org/20260707115411.1714314-4-zhen.ni@easystack.cn Signed-off-by: Zhen Ni Tested-by: Zi Yan Acked-by: Vlastimil Babka (SUSE) Acked-by: Zi Yan Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton

tools/mm: add thp_swap_allocator_test binary to .gitignore

2026-07-29T04:11:43+00:00

Tell git to ignore the generated binary for thp_swap_allocator_test.c. Link: https://lore.kernel.org/20260624150642.19749-1-zenghui.yu@linux.dev Signed-off-by: Zenghui Yu Reviewed-by: SeongJae Park Signed-off-by: Andrew Morton