linux/mm/memcontrol-v1.h, branch v7.0

Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-02-12T19:32:37Z

Pull MM updates from Andrew Morton: - "powerpc/64s: do not re-activate batched TLB flush" makes arch_{enter|leave}_lazy_mmu_mode() nest properly (Alexander Gordeev) It adds a generic enter/leave layer and switches architectures to use it. Various hacks were removed in the process. - "zram: introduce compressed data writeback" implements data compression for zram writeback (Richard Chang and Sergey Senozhatsky) - "mm: folio_zero_user: clear page ranges" adds clearing of contiguous page ranges for hugepages. Large improvements during demand faulting are demonstrated (David Hildenbrand) - "memcg cleanups" tidies up some memcg code (Chen Ridong) - "mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos stats" improves DAMOS stat's provided information, deterministic control, and readability (SeongJae Park) - "selftests/mm: hugetlb cgroup charging: robustness fixes" fixes a few issues in the hugetlb cgroup charging selftests (Li Wang) - "Fix va_high_addr_switch.sh test failure - again" addresses several issues in the va_high_addr_switch test (Chunyu Hu) - "mm/damon/tests/core-kunit: extend existing test scenarios" improves the KUnit test coverage for DAMON (Shu Anzai) - "mm/khugepaged: fix dirty page handling for MADV_COLLAPSE" fixes a glitch in khugepaged which was causing madvise(MADV_COLLAPSE) to transiently return -EAGAIN (Shivank Garg) - "arch, mm: consolidate hugetlb early reservation" reworks and consolidates a pile of straggly code related to reservation of hugetlb memory from bootmem and creation of CMA areas for hugetlb (Mike Rapoport) - "mm: clean up anon_vma implementation" cleans up the anon_vma implementation in various ways (Lorenzo Stoakes) - "tweaks for __alloc_pages_slowpath()" does a little streamlining of the page allocator's slowpath code (Vlastimil Babka) - "memcg: separate private and public ID namespaces" cleans up the memcg ID code and prevents the internal-only private IDs from being exposed to userspace (Shakeel Butt) - "mm: hugetlb: allocate frozen gigantic folio" cleans up the allocation of frozen folios and avoids some atomic refcount operations (Kefeng Wang) - "mm/damon: advance DAMOS-based LRU sorting" improves DAMOS's movement of memory betewwn the active and inactive LRUs and adds auto-tuning of the ratio-based quotas and of monitoring intervals (SeongJae Park) - "Support page table check on PowerPC" makes CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc (Andrew Donnellan) - "nodemask: align nodes_and{,not} with underlying bitmap ops" makes nodes_and() and nodes_andnot() propagate the return values from the underlying bit operations, enabling some cleanup in calling code (Yury Norov) - "mm/damon: hide kdamond and kdamond_lock from API callers" cleans up some DAMON internal interfaces (SeongJae Park) - "mm/khugepaged: cleanups and scan limit fix" does some cleanup work in khupaged and fixes a scan limit accounting issue (Shivank Garg) - "mm: balloon infrastructure cleanups" goes to town on the balloon infrastructure and its page migration function. Mainly cleanups, also some locking simplification (David Hildenbrand) - "mm/vmscan: add tracepoint and reason for kswapd_failures reset" adds additional tracepoints to the page reclaim code (Jiayuan Chen) - "Replace wq users and add WQ_PERCPU to alloc_workqueue() users" is part of Marco's kernel-wide migration from the legacy workqueue APIs over to the preferred unbound workqueues (Marco Crivellari) - "Various mm kselftests improvements/fixes" provides various unrelated improvements/fixes for the mm kselftests (Kevin Brodsky) - "mm: accelerate gigantic folio allocation" greatly speeds up gigantic folio allocation, mainly by avoiding unnecessary work in pfn_range_valid_contig() (Kefeng Wang) - "selftests/damon: improve leak detection and wss estimation reliability" improves the reliability of two of the DAMON selftests (SeongJae Park) - "mm/damon: cleanup kdamond, damon_call(), damos filter and DAMON_MIN_REGION" does some cleanup work in the core DAMON code (SeongJae Park) - "Docs/mm/damon: update intro, modules, maintainer profile, and misc" performs maintenance work on the DAMON documentation (SeongJae Park) - "mm: add and use vma_assert_stabilised() helper" refactors and cleans up the core VMA code. The main aim here is to be able to use the mmap write lock's lockdep state to perform various assertions regarding the locking which the VMA code requires (Lorenzo Stoakes) - "mm, swap: swap table phase II: unify swapin use" removes some old swap code (swap cache bypassing and swap synchronization) which wasn't working very well. Various other cleanups and simplifications were made. The end result is a 20% speedup in one benchmark (Kairui Song) - "enable PT_RECLAIM on more 64-bit architectures" makes PT_RECLAIM available on 64-bit alpha, loongarch, mips, parisc, and um. Various cleanups were performed along the way (Qi Zheng) * tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (325 commits) mm/memory: handle non-split locks correctly in zap_empty_pte_table() mm: move pte table reclaim code to memory.c mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config um: mm: enable MMU_GATHER_RCU_TABLE_FREE parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE mips: mm: enable MMU_GATHER_RCU_TABLE_FREE LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles zsmalloc: make common caches global mm: add SPDX id lines to some mm source files mm/zswap: use %pe to print error pointers mm/vmscan: use %pe to print error pointers mm/readahead: fix typo in comment mm: khugepaged: fix NR_FILE_PAGES and NR_SHMEM in collapse_file() mm: refactor vma_map_pages to use vm_insert_pages mm/damon: unify address range representation with damon_addr_range mm/cma: replace snprintf with strscpy in cma_new_area ...

memcg: introduce private id API for in-kernel users

2026-01-27T04:02:23Z

Patch series "memcg: separate private and public ID namespaces". The memory cgroup subsystem maintains a private ID infrastructure that is decoupled from the cgroup IDs. This private ID system exists because some kernel objects (like swap entries and shadow entries in the workingset code) can outlive the cgroup they were associated with. The motivation is best described in commit 73f576c04b941 ("mm: memcontrol: fix cgroup creation failure after many small jobs"). Unfortunately, some in-kernel users (DAMON, LRU gen debugfs interface, shrinker debugfs) started exposing these private IDs to userspace. This is problematic because: 1. The private IDs are internal implementation details that could change 2. Userspace already has access to cgroup IDs through the cgroup filesystem 3. Using different ID namespaces in different interfaces is confusing This series cleans up the memcg ID infrastructure by: 1. Explicitly marking the private ID APIs with "private" in their names to make it clear they are for internal use only (swap/workingset) 2. Making the public cgroup ID APIs (mem_cgroup_id/mem_cgroup_get_from_id) unconditionally available 3. Converting DAMON, LRU gen, and shrinker debugfs interfaces to use the public cgroup IDs instead of the private IDs 4. Removing the now-unused wrapper functions and renaming the public APIs for clarity After this series: - mem_cgroup_private_id() / mem_cgroup_from_private_id() are used for internal kernel objects that outlive their cgroup (swap, workingset) - mem_cgroup_id() / mem_cgroup_get_from_id() return the public cgroup ID (from cgroup_id()) for use in userspace-facing interfaces This patch (of 8): The memory cgroup maintains a private ID infrastructure decoupled from the cgroup IDs for swapout records and shadow entries. The main motivation of this private ID infra is best described in the commit 73f576c04b941 ("mm: memcontrol: fix cgroup creation failure after many small jobs"). Unfortunately some users have started exposing these private IDs to the userspace where they should have used the cgroup IDs which are already exposed to the userspace. Let's rename the memcg ID APIs to explicitly mark them private. No functional change is intended. Link: https://lkml.kernel.org/r/20251225232116.294540-1-shakeel.butt@linux.dev Link: https://lkml.kernel.org/r/20251225232116.294540-2-shakeel.butt@linux.dev Signed-off-by: Shakeel Butt Acked-by: Michal Hocko Cc: Axel Rasmussen Cc: Dave Chinner Cc: David Hildenbrand Cc: Johannes Weiner Cc: Lorenzo Stoakes Cc: Muchun Song Cc: Qi Zheng Cc: Roman Gushchin Cc: SeongJae Park Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton

memcg: move mem_cgroup_usage memcontrol-v1.c

2026-01-21T03:24:41Z

Patch series "memcg cleanups", v3. Two code moves/removals with no behavior change. This patch (of 2): Currently, mem_cgroup_usage is only used for v1, just move it to memcontrol-v1.c Link: https://lkml.kernel.org/r/20251211013019.2080004-1-chenridong@huaweicloud.com Link: https://lkml.kernel.org/r/20251211013019.2080004-2-chenridong@huaweicloud.com Signed-off-by: Chen Ridong Acked-by: Michal Hocko Acked-by: Johannes Weiner Acked-by: Shakeel Butt Acked-by: Michal Koutný Cc: Axel Rasmussen Cc: Lorenzo Stoakes Cc: Lu Jialin Cc: Muchun Song Cc: Qi Zheng Cc: Roman Gushchin Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton

mm: declare memcg_page_state_output() in memcontrol.h

2025-12-23T06:20:21Z

To use memcg_page_state_output() in bpf_memcontrol.c move the declaration from v1-specific memcontrol-v1.h to memcontrol.h. Signed-off-by: Roman Gushchin Acked-by: Michal Hocko Acked-by: Shakeel Butt Link: https://lore.kernel.org/r/20251223044156.208250-2-roman.gushchin@linux.dev Signed-off-by: Alexei Starovoitov

memcg: move do_memsw_account() to CONFIG_MEMCG_V1

2025-03-22T05:03:11Z

The do_memsw_account() is used to enable or disable legacy memory+swap accounting in memory cgroup. However with disabled CONFIG_MEMCG_V1, we don't need to keep checking it. So, let's always return false for !CONFIG_MEMCG_V1 configs. Before the patch: $ size mm/memcontrol.o text data bss dec hex filename 49928 10736 4172 64836 fd44 mm/memcontrol.o After the patch: $ size mm/memcontrol.o text data bss dec hex filename 49430 10480 4172 64082 fa52 mm/memcontrol.o Link: https://lkml.kernel.org/r/20250312222552.3284173-1-shakeel.butt@linux.dev Signed-off-by: Shakeel Butt Acked-by: Johannes Weiner Acked-by: Michal Hocko Cc: Muchun Song Cc: Roman Gushchin Signed-off-by: Andrew Morton

mm: memcontrol: move memsw charge callbacks to v1

2025-03-17T05:05:55Z

The interweaving of two entirely different swap accounting strategies has been one of the more confusing parts of the memcg code. Split out the v1 code to clarify the implementation and a handful of callsites, and to avoid building the v1 bits when !CONFIG_MEMCG_V1. text data bss dec hex filename 39253 6446 4160 49859 c2c3 mm/memcontrol.o.old 38877 6382 4160 49419 c10b mm/memcontrol.o Link: https://lkml.kernel.org/r/20250124054132.45643-1-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Acked-by: Roman Gushchin Acked-by: Michal Hocko Acked-by: Balbir Singh Acked-by: Shakeel Butt Cc: Muchun Song Signed-off-by: Andrew Morton

mm: memcontrol: move stray ratelimit bits to v1

2025-03-17T05:05:55Z

41213dd0f816 ("memcg: move mem_cgroup_event_ratelimit to v1 code") left this one behind. There are no v2 references. Link: https://lkml.kernel.org/r/20250124043859.18808-2-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Acked-by: Roman Gushchin Acked-by: Shakeel Butt Acked-by: Michal Hocko Cc: Muchun Song Signed-off-by: Andrew Morton

mm: memcontrol: unshare v2-only charge API bits again

2025-03-17T05:05:55Z

6b611388b626 ("memcg-v1: remove charge move code") removed the remaining v1 callers. Link: https://lkml.kernel.org/r/20250124043859.18808-1-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Acked-by: Roman Gushchin Acked-by: Shakeel Butt Acked-by: Michal Hocko Cc: Muchun Song Signed-off-by: Andrew Morton

memcg: add CONFIG_MEMCG_V1 for 'local' functions

2025-03-17T05:05:54Z

Add CONFIG_MEMCG_V1 for the 'local' functions, which are only used in memcg v1, so that they won't be built for v2. Link: https://lkml.kernel.org/r/20250124073514.2375622-5-chenridong@huaweicloud.com Signed-off-by: Chen Ridong Acked-by: Johannes Weiner Acked-by: Shakeel Butt Acked-by: Roman Gushchin Cc: David Finkel Cc: Michal Hocko Cc: Muchun Song Cc: Vlastimil Babka Cc: Wang Weiyang Cc: Yosry Ahmed Cc: Michal Hocko Cc: Michal Koutný Cc: Muchun Song Signed-off-by: Andrew Morton

mm: memcg: declare do_memsw_account inline

2024-12-06T03:54:46Z

In commit 66d60c428b23 ("mm: memcg: move legacy memcg event code into memcontrol-v1.c"), the static do_memsw_account() function was moved from a .c file to a .h file. Unfortunately, the traditional inline keyword wasn't added. If a file (e.g., a unit test) includes the .h file, but doesn't refer to do_memsw_account(), it will get a warning like: mm/memcontrol-v1.h:41:13: warning: unused function 'do_memsw_account' [-Wunused-function] 41 | static bool do_memsw_account(void) | ^~~~~~~~~~~~~~~~ Link: https://lkml.kernel.org/r/20241128203959.726527-1-jsperbeck@google.com Fixes: 66d60c428b23 ("mm: memcg: move legacy memcg event code into memcontrol-v1.c") Signed-off-by: John Sperbeck Acked-by: Roman Gushchin Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Shakeel Butt Cc: Signed-off-by: Andrew Morton