kernel/linux.git/include/trace/events/writeback.h, branch v7.0-rc7

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

2026-02-12T19:32:37+00:00

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 ...

mm/block/fs: remove laptop_mode

2026-01-21T03:24:47+00:00

Laptop mode was introduced to save battery, by delaying and consolidating writes and thereby maximize the time rotating hard drives wouldn't have to spin. Luckily, rotating hard drives, with their high spin-up times and power draw, are a thing of the past for battery-powered devices. Reclaim has also since changed to not write single filesystem pages anymore, and regular filesystem writeback is lumpy by design. The juice doesn't appear worth the squeeze anymore. The footprint of the feature is small, but nevertheless it's a complicating factor in mm, block, filesystems. Developers don't think about it, and it likely hasn't been tested with new reclaim and writeback changes in years. Let's sunset it. Keep the sysctl with a deprecation warning around for a few more cycles, but remove all functionality behind it. [akpm@linux-foundation.org: fix Documentation/admin-guide/laptops/index.rst] Link: https://lkml.kernel.org/r/20251216185201.GH905277@cmpxchg.org Signed-off-by: Johannes Weiner Suggested-by: Christoph Hellwig Reviewed-by: Christoph Hellwig Acked-by: Jens Axboe Reviewed-by: Shakeel Butt Acked-by: Michal Hocko Cc: Deepanshu Kartikey Signed-off-by: Andrew Morton

fs: factor out a sync_lazytime helper

2026-01-12T13:01:33+00:00

Centralize how we synchronize a lazytime update into the actual on-disk timestamp into a single helper. Signed-off-by: Christoph Hellwig Link: https://patch.msgid.link/20260108141934.2052404-7-hch@lst.de Reviewed-by: Jan Kara Reviewed-by: Chaitanya Kulkarni Reviewed-by: Jeff Layton Signed-off-by: Christian Brauner

Manual conversion to use ->i_state accessors of all places not covered by coccinelle

2025-10-20T18:22:26+00:00

Nothing to look at apart from iput_final(). Signed-off-by: Mateusz Guzik Signed-off-by: Christian Brauner

writeback: Add tracepoint to track pending inode switches

2025-09-19T11:11:06+00:00

Add trace_inode_switch_wbs_queue tracepoint to allow insight into how many inodes are queued to switch their bdi_writeback structure. Acked-by: Tejun Heo Signed-off-by: Jan Kara Signed-off-by: Christian Brauner

mm: remove the for_reclaim field from struct writeback_control

2025-07-10T05:41:58+00:00

This field is now only set to one in the i915 gem code that only calls writeback_iter on it, which ignores the flag. All other checks are thuse dead code and the field can be removed. Link: https://lkml.kernel.org/r/20250610054959.2057526-7-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Baolin Wang Cc: Chengming Zhou Cc: Hugh Dickins Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Cc: Nhat Pham Signed-off-by: Andrew Morton

writeback: fix calculations in trace_balance_dirty_pages() for cgwb

2025-03-17T07:05:37+00:00

In the commit dcc25ae76eb7 ("writeback: move global_dirty_limit into wb_domain") of the cgroup writeback backpressure propagation patchset, Tejun made some adaptations to trace_balance_dirty_pages() for cgroup writeback. However, this adaptation was incomplete and Tejun missed further adaptation in the subsequent patches. In the cgroup writeback scenario, if sdtc in balance_dirty_pages() is assigned to mdtc, then upon entering trace_balance_dirty_pages(), __entry->limit should be assigned based on the dirty_limit of the corresponding memcg's wb_domain, rather than global_wb_domain. To address this issue and simplify the implementation, introduce a 'limit' field in struct dirty_throttle_control to store the hard_limit value computed in wb_position_ratio() by calling hard_dirty_limit(). This field will then be used in trace_balance_dirty_pages() to assign the value to __entry->limit. Link: https://lkml.kernel.org/r/20250304110318.159567-4-yizhou.tang@shopee.com Fixes: dcc25ae76eb7 ("writeback: move global_dirty_limit into wb_domain") Signed-off-by: Tang Yizhou Acked-by: Tejun Heo Cc: Alexei Starovoitov Cc: Christian Brauner Cc: Jan Kara Cc: "Masami Hiramatsu (Google)" Cc: Matthew Wilcow (Oracle) Cc: Steven Rostedt Signed-off-by: Andrew Morton

writeback: rename variables in trace_balance_dirty_pages()

2025-03-17T07:05:37+00:00

Rename bdi_setpoint and bdi_dirty in the tracepoint to wb_setpoint and wb_dirty, respectively. These changes were omitted by Tejun in the cgroup writeback patchset. Link: https://lkml.kernel.org/r/20250304110318.159567-3-yizhou.tang@shopee.com Signed-off-by: Tang Yizhou Cc: Alexei Starovoitov Cc: Christian Brauner Cc: Jan Kara Cc: "Masami Hiramatsu (Google)" Cc: Matthew Wilcow (Oracle) Cc: Steven Rostedt Cc: Tejun Heo Signed-off-by: Andrew Morton

writeback: let trace_balance_dirty_pages() take struct dtc as parameter

2025-03-17T07:05:37+00:00

Patch series "Fix calculations in trace_balance_dirty_pages() for cgwb", v2. In my experiment, I found that the output of trace_balance_dirty_pages() in the cgroup writeback scenario was strange because trace_balance_dirty_pages() always uses global_wb_domain.dirty_limit for related calculations instead of the dirty_limit of the corresponding memcg's wb_domain. The basic idea of the fix is to store the hard dirty limit value computed in wb_position_ratio() into struct dirty_throttle_control and use it for calculations in trace_balance_dirty_pages(). This patch (of 3): Currently, trace_balance_dirty_pages() already has 12 parameters. In the patch #3, I initially attempted to introduce an additional parameter. However, in include/linux/trace_events.h, bpf_trace_run12() only supports up to 12 parameters and bpf_trace_run13() does not exist. To reduce the number of parameters in trace_balance_dirty_pages(), we can make it accept a pointer to struct dirty_throttle_control as a parameter. To achieve this, we need to move the definition of struct dirty_throttle_control from mm/page-writeback.c to include/linux/writeback.h. Link: https://lkml.kernel.org/r/20250304110318.159567-1-yizhou.tang@shopee.com Link: https://lkml.kernel.org/r/20250304110318.159567-2-yizhou.tang@shopee.com Signed-off-by: Tang Yizhou Cc: Alexei Starovoitov Cc: Christian Brauner Cc: Steven Rostedt Cc: Jan Kara Cc: "Masami Hiramatsu (Google)" Cc: Matthew Wilcow (Oracle) Cc: Tang Yizhou Cc: Tejun Heo Signed-off-by: Andrew Morton

writeback: Refine the show_inode_state() macro definition

2024-08-30T06:22:41+00:00

Currently, the show_inode_state() macro only prints part of the state of inode->i_state. Let’s improve it to display more of its state. Signed-off-by: Julian Sun Link: https://lore.kernel.org/r/20240828081359.62429-1-sunjunchao2870@gmail.com Reviewed-by: Jan Kara Signed-off-by: Christian Brauner