kernel/linux.git/tools/mm, branch v6.19.11

tools/mm/page_owner_sort: fix timestamp comparison for stable sorting

2025-12-23T19:23:14+00:00

The ternary operator in compare_ts() returns 1 when timestamps are equal, causing unstable sorting behavior. Replace with explicit three-way comparison that returns 0 for equal timestamps, ensuring stable qsort ordering and consistent output. Link: https://lkml.kernel.org/r/20251209044552.3396468-1-kaushlendra.kumar@intel.com Fixes: 8f9c447e2e2b ("tools/vm/page_owner_sort.c: support sorting pid and time") Signed-off-by: Kaushlendra Kumar Cc: Chongxi Zhao Cc: Signed-off-by: Andrew Morton

tools/mm/page_owner_sort: add help option support

2025-11-17T01:28:06+00:00

Add -h/--help option to display usage information and improve code style. Link: https://lkml.kernel.org/r/20251016054927.138510-1-ye.liu@linux.dev Signed-off-by: Ye Liu Cc: SeongJae Park Signed-off-by: Andrew Morton

tools/mm: use in page_owner_sort.c

2025-11-17T01:28:05+00:00

Use standard instead of manually defining bool, true and false. Link: https://lkml.kernel.org/r/20251015093851.109663-1-ye.liu@linux.dev Signed-off-by: Ye Liu Reviewed-by: Dev Jain Reviewed-by: SeongJae Park Signed-off-by: Andrew Morton

tools/mm/slabinfo: fix access to null terminator in string boundary

2025-09-21T21:22:00+00:00

The current code incorrectly accesses buffer[strlen(buffer)], which points to the null terminator ('\0') at the end of the string. This is technically out-of-bounds access since valid string content ends at index strlen(buffer)-1. Fix by: 1. Declaring strlen() result variable at function scope 2. Adding bounds check (len > 0) to handle empty strings 3. Using buffer[len-1] to correctly access the last character before the null terminator [kaushlendra.kumar@intel.com: remove unnecessary blank line] Link: https://lkml.kernel.org/r/20250901044955.3902815-1-kaushlendra.kumar@intel.com Link: https://lkml.kernel.org/r/20250830172022.1927448-1-kaushlendra.kumar@intel.com Signed-off-by: Kaushlendra Kumar Acked-by: SeongJae Park Signed-off-by: Andrew Morton

tools/mm: add script to display page state for a given PID and VADDR

2025-07-10T05:41:53+00:00

Introduces a new drgn script, `show_page_info.py`, which allows users to analyze the state of a page given a process ID (PID) and a virtual address (VADDR). This can help kernel developers or debuggers easily inspect page-related information in a live kernel or vmcore. The script extracts information such as the page flags, mapping, and other metadata relevant to diagnosing memory issues. Output example: sudo ./show_page_info.py 1 0x7fc988181000 PID: 1 Comm: systemd mm: 0xffff8d22c4089700 RAW: 0017ffffc000416c fffff939062ff708 fffff939062ffe08 ffff8d23062a12a8 RAW: 0000000000000000 ffff8d2323438f60 0000002500000007 ffff8d23203ff500 Page Address: 0xfffff93905664e00 Page Flags: PG_referenced|PG_uptodate|PG_lru|PG_head|PG_active| PG_private|PG_reported|PG_has_hwpoisoned Page Size: 4096 Page PFN: 0x159938 Page Physical: 0x159938000 Page Virtual: 0xffff8d2319938000 Page Refcount: 37 Page Mapcount: 7 Page Index: 0x0 Page Memcg Data: 0xffff8d23203ff500 Memcg Name: init.scope Memcg Path: /sys/fs/cgroup/memory/init.scope Page Mapping: 0xffff8d23062a12a8 Page Anon/File: File Page VMA: 0xffff8d22e06e0e40 VMA Start: 0x7fc988181000 VMA End: 0x7fc988185000 This page is part of a compound page. This page is the head page of a compound page. Head Page: 0xfffff93905664e00 Compound Order: 2 Number of Pages: 4 Link: https://lkml.kernel.org/r/20250530055855.687067-1-ye.liu@linux.dev Signed-off-by: Ye Liu Tested-by: SeongJae Park Reviewed-by: Stephen Brennan Cc: Florian Weimer Cc: Omar Sandoval Cc: "Paul E . McKenney" Cc: Sweet Tea Dorminy Signed-off-by: Andrew Morton

tools/mm: fix build warnings with musl-libc

2025-02-18T06:40:02+00:00

musl-libc warns about the following: /home/florian/dev/buildroot/output/arm64/rpi4-b/host/aarch64-buildroot-linux-musl/sysroot/usr/include/sys/errno.h:1:2: attention: #warning redirecting incorrect #include to [-Wcpp] 1 | #warning redirecting incorrect #include to | ^~~~~~~ /home/florian/dev/buildroot/output/arm64/rpi4-b/host/aarch64-buildroot-linux-musl/sysroot/usr/include/sys/fcntl.h:1:2: attention: #warning redirecting incorrect #include to [-Wcpp] 1 | #warning redirecting incorrect #include to | ^~~~~~~ include errno.h and fcntl.h directly. Link: https://lkml.kernel.org/r/20250210200518.1137295-1-florian.fainelli@broadcom.com Signed-off-by: Florian Fainelli Signed-off-by: Andrew Morton

Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-11-23T17:58:07+00:00

Pull MM updates from Andrew Morton: - The series "zram: optimal post-processing target selection" from Sergey Senozhatsky improves zram's post-processing selection algorithm. This leads to improved memory savings. - Wei Yang has gone to town on the mapletree code, contributing several series which clean up the implementation: - "refine mas_mab_cp()" - "Reduce the space to be cleared for maple_big_node" - "maple_tree: simplify mas_push_node()" - "Following cleanup after introduce mas_wr_store_type()" - "refine storing null" - The series "selftests/mm: hugetlb_fault_after_madv improvements" from David Hildenbrand fixes this selftest for s390. - The series "introduce pte_offset_map_{ro|rw}_nolock()" from Qi Zheng implements some rationaizations and cleanups in the page mapping code. - The series "mm: optimize shadow entries removal" from Shakeel Butt optimizes the file truncation code by speeding up the handling of shadow entries. - The series "Remove PageKsm()" from Matthew Wilcox completes the migration of this flag over to being a folio-based flag. - The series "Unify hugetlb into arch_get_unmapped_area functions" from Oscar Salvador implements a bunch of consolidations and cleanups in the hugetlb code. - The series "Do not shatter hugezeropage on wp-fault" from Dev Jain takes away the wp-fault time practice of turning a huge zero page into small pages. Instead we replace the whole thing with a THP. More consistent cleaner and potentiall saves a large number of pagefaults. - The series "percpu: Add a test case and fix for clang" from Andy Shevchenko enhances and fixes the kernel's built in percpu test code. - The series "mm/mremap: Remove extra vma tree walk" from Liam Howlett optimizes mremap() by avoiding doing things which we didn't need to do. - The series "Improve the tmpfs large folio read performance" from Baolin Wang teaches tmpfs to copy data into userspace at the folio size rather than as individual pages. A 20% speedup was observed. - The series "mm/damon/vaddr: Fix issue in damon_va_evenly_split_region()" fro Zheng Yejian fixes DAMON splitting. - The series "memcg-v1: fully deprecate charge moving" from Shakeel Butt removes the long-deprecated memcgv2 charge moving feature. - The series "fix error handling in mmap_region() and refactor" from Lorenzo Stoakes cleanup up some of the mmap() error handling and addresses some potential performance issues. - The series "x86/module: use large ROX pages for text allocations" from Mike Rapoport teaches x86 to use large pages for read-only-execute module text. - The series "page allocation tag compression" from Suren Baghdasaryan is followon maintenance work for the new page allocation profiling feature. - The series "page->index removals in mm" from Matthew Wilcox remove most references to page->index in mm/. A slow march towards shrinking struct page. - The series "damon/{self,kunit}tests: minor fixups for DAMON debugfs interface tests" from Andrew Paniakin performs maintenance work for DAMON's self testing code. - The series "mm: zswap swap-out of large folios" from Kanchana Sridhar improves zswap's batching of compression and decompression. It is a step along the way towards using Intel IAA hardware acceleration for this zswap operation. - The series "kasan: migrate the last module test to kunit" from Sabyrzhan Tasbolatov completes the migration of the KASAN built-in tests over to the KUnit framework. - The series "implement lightweight guard pages" from Lorenzo Stoakes permits userapace to place fault-generating guard pages within a single VMA, rather than requiring that multiple VMAs be created for this. Improved efficiencies for userspace memory allocators are expected. - The series "memcg: tracepoint for flushing stats" from JP Kobryn uses tracepoints to provide increased visibility into memcg stats flushing activity. - The series "zram: IDLE flag handling fixes" from Sergey Senozhatsky fixes a zram buglet which potentially affected performance. - The series "mm: add more kernel parameters to control mTHP" from Maíra Canal enhances our ability to control/configuremultisize THP from the kernel boot command line. - The series "kasan: few improvements on kunit tests" from Sabyrzhan Tasbolatov has a couple of fixups for the KASAN KUnit tests. - The series "mm/list_lru: Split list_lru lock into per-cgroup scope" from Kairui Song optimizes list_lru memory utilization when lockdep is enabled. * tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (215 commits) cma: enforce non-zero pageblock_order during cma_init_reserved_mem() mm/kfence: add a new kunit test test_use_after_free_read_nofault() zram: fix NULL pointer in comp_algorithm_show() memcg/hugetlb: add hugeTLB counters to memcg vmstat: call fold_vm_zone_numa_events() before show per zone NUMA event mm: mmap_lock: check trace_mmap_lock_$type_enabled() instead of regcount zram: ZRAM_DEF_COMP should depend on ZRAM MAINTAINERS/MEMORY MANAGEMENT: add document files for mm Docs/mm/damon: recommend academic papers to read and/or cite mm: define general function pXd_init() kmemleak: iommu/iova: fix transient kmemleak false positive mm/list_lru: simplify the list_lru walk callback function mm/list_lru: split the lock to per-cgroup scope mm/list_lru: simplify reparenting and initial allocation mm/list_lru: code clean up for reparenting mm/list_lru: don't export list_lru_add mm/list_lru: don't pass unnecessary key parameters kasan: add kunit tests for kmalloc_track_caller, kmalloc_node_track_caller kasan: change kasan_atomics kunit test as KUNIT_CASE_SLOW kasan: use EXPORT_SYMBOL_IF_KUNIT to export symbols ...

tools/mm: fix compile error

2024-11-15T06:43:48+00:00

Add a missing semicolon. Link: https://lkml.kernel.org/r/20241112171655.1662670-1-motiejus@jakstys.lt Fixes: ece5897e5a10 ("tools/mm: -Werror fixes in page-types/slabinfo") Signed-off-by: Motiejus JakÅ`tys Closes: https://github.com/NixOS/nixpkgs/issues/355369 Reviewed-by: SeongJae Park Reviewed-by: Vishal Moola (Oracle) Acked-by: Oleksandr Natalenko Cc: Wladislav Wiebe Signed-off-by: Andrew Morton

tools/mm: fix slabinfo crash when MAX_SLABS is exceeded

2024-11-11T21:09:43+00:00

The number of slabs can easily exceed the hard coded MAX_SLABS in the slabinfo tool, causing it to overwrite memory and crash. Increase the value of MAX_SLABS, and check if that has been exceeded for each new slab, instead of at the end when it's already too late. Also move the check for MAX_ALIASES into the loop body. Link: https://lkml.kernel.org/r/20241031105534.565533-1-marc.c.dionne@gmail.com Signed-off-by: Marc Dionne Acked-by: Vlastimil Babka Signed-off-by: Andrew Morton

tools/mm: free the allocated memory

2024-11-07T04:11:17+00:00

The comm_str memory needs to be freed if the search_pattern function call fails in get_comm [akpm@linux-foundation.org: fix whitespace] Link: https://lkml.kernel.org/r/20241022012526.7597-1-liujing@cmss.chinamobile.com Signed-off-by: Liu Jing Signed-off-by: Andrew Morton