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309 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
18fbf5151d |
mm.git review status for linus..mm-stable
Everything: Total patches: 171 Reviews/patch: 1.83 Reviewed rate: 82% Excluding selftests: Total patches: 149 Reviews/patch: 1.77 Reviewed rate: 80% Excluding selftests and maple_tree: Total patches: 129 Reviews/patch: 1.99 Reviewed rate: 89% Summary of patch series in this merge: - "mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff" (Lorenzo Stoakes): Index MAP_PRIVATE file-backed folios by their anonymous page offset to resolve confusion around reverse mapping for zeroed and CoW'd file-backed memory. Use this new VMA anonymous page offset tracking to eliminate index conflicts and lay the foundation for scalable CoW performance improvements. - "promote mapped executable folios after first usage for MGLRU" (Baolin Wang): Make MGLRU's protection of mapped executable file folios more reliable. Follow the classical LRU's logic, promoting mapped executable file folios after their first usage to give executable code a better chance to stay in memory and improve workload performance. - "mm: vmscan: fix node reclaim ignoring swappiness parameter" (Ridong Chen): Fix per-node proactive reclaim interface's ignoring the swappiness parameter when CONFIG_MEMCG is disabled by consolidating sc_swappiness() into a single function that checks proactive_swappiness regardless of kernel configuration. - "mm/vmscan: reduce lru_lock contention via vmstat-derived scan-balance cost" (Usama Arif): Reduce lru_lock contention in the reclaim path by deriving scan-balance costs from vmstat counters rather than lock-acquired producer updates. Read and decay these cost signals on the reclaim side under a dedicated per-lruvec lock, reducing total LRU lock wait time by over 60% without impacting scan throughput. - "zram: fix zram issues reported by sashiko" (Sergey Senozhatsky): Fix two low-risk zram bugs which Sashiko spotted in drive-by review. - "Honor XA_FLAGS_ACCOUNT in xas_split_alloc() and charge to folio's memcg" (Zi Yan): Fix xas_split_alloc() by enabling target folio memcg charging during splits and adding the missing __GFP_ACCOUNT flag for proper XArray node memory accounting. - "selftests/mm: use pattern matching in .gitignore" (Pratyush Mallick): Replace hardcoded binary names in selftests/mm/.gitignore with a generic pattern-matching rule to automatically ignore generated test files and avoid manual updates when adding new tests. - "mm/page_ext: remove pgdat_page_ext_init()" (Sang-Heon Jeon): Make the incompatibility between FLATMEM and NUMA explicit in mm/Kconfig and remove the unused pgdat_page_ext_init() function. - "zram: fix zstd error paths and add parameter validation" (Haoqin Huang): Clean up zram compression backends by removing redundant error cleanup, adding parameter and dictionary validation, auto-prefixing algorithm error logs, and resetting parameters prior to reinitialization. - "zram: fix stale scan bounds after reinitialization" (Longlong Xia): Prevent out-of-bounds slot accesses during concurrent zram resets by moving table scan bound calculations under dev_lock in writeback_store() and read_block_state(). - "add anon mTHP collapse test cases" (Baolin Wang): Extend selftests helper functions to support arbitrary page orders and add new test cases and options for mTHP collapse in khugepaged. - "selftests/mm: Handle unsupported and transient test conditions" (Muhammad Usama Anjum): Update MM selftests to report a SKIP status instead of a failure when required kernel or filesystem features are unsupported, while adding retry logic for transient page migration errors. - "mm/zswap: Fixes and improves the zswap shrink" (Hao Jia): Fix the missing zswap global shrinker when CONFIG_MEMCG is disabled and extend shrink_memcg() to support batch writeback for improved writeback efficiency. - "alloc_tag: introduce IOCTL-based filtering for MAP" (Suren Baghdasaryan): Introduce an IOCTL-based binary interface for memory allocation profiling that enables kernel-side filtering before per-CPU counter aggregation. This eliminates the text-parsing overhead of /proc/allocinfo and provides up to a 20x speedup by transferring only filtered allocation data to userspace. - "better block swap batching and a different take on swap_ops v5" (Christoph Hellwig): Refactor block swap I/O to use swap_iocb for batching instead of single-bio requests and rebase the swap_ops interface, achieving faster swap throughput during kernel builds. - "mm: kmemleak: reduce transient false positives by confirming leaks" (Catalin Marinas): Reduce false-positive kmemleak reports by combining two kmemleak enhancements that add a second confirmation scan and a configurable minimum unreferenced scan count module parameter. - "mm: kmemleak: default min_unref_scans to 2 for verbose kernels" (Breno Leitao): Auto-scanning kernels can generate false-positive memory leak reports on single scans, so this patch defaults min_unref_scans to 2 when CONFIG_DEBUG_KMEMLEAK_VERBOSE is enabled to require a second confirming scan. - "swap_ops updates" (Christoph Hellwig): Batching I/O for synchronous swap devices causes performance regressions and filesystem-based swap suffers from double-indirection overhead. This series resolves both issues by reintroducing per-folio writes for synchronous swap and allowing filesystems to directly export their own swap_ops. - "mm/khugepaged: several cleanups" (Nico Pache): khugepaged accumulated redundant state-checking patterns and outdated comments following mTHP integration. Introduce dedicated helpers for PTE validation and event counting while refreshing the internal documentation. - "maple_tree: lock checking and clean ups" (Liam Howlett): Syzbot reports incorrectly blame memory management exit paths for locking bugs, maple tree erase operations risk allocation failures without gfp flags and internal documentation lacks clarity. Improve lock error detection, update docs, fix race and allocation edge cases and optimize erase allocations using a fallback to GFP_KERNEL | GFP_NOFAIL. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCao9nJQAKCRDdBJ7gKXxA jk/9AQDlfevYJuSJmzAI8bt8ISG+/TfXMtIZC/MdbHqtQVYWPQD8Cvm3DUZsdGB/ Gloq/HBFuMPgE8p2pwUIthdgnTPNvAc= =c+Nb -----END PGP SIGNATURE----- Merge tag 'mm-stable-2026-08-26-15-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull more MM updates from Andrew Morton: - "mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff" (Lorenzo Stoakes) Index MAP_PRIVATE file-backed folios by their anonymous page offset to resolve confusion around reverse mapping for zeroed and CoW'd file-backed memory. Use this new VMA anonymous page offset tracking to eliminate index conflicts and lay the foundation for scalable CoW performance improvements. - "promote mapped executable folios after first usage for MGLRU" (Baolin Wang) Make MGLRU's protection of mapped executable file folios more reliable. Follow the classical LRU's logic, promoting mapped executable file folios after their first usage to give executable code a better chance to stay in memory and improve workload performance. - "mm: vmscan: fix node reclaim ignoring swappiness parameter" (Ridong Chen) Fix per-node proactive reclaim interface's ignoring the swappiness parameter when CONFIG_MEMCG is disabled by consolidating sc_swappiness() into a single function that checks proactive_swappiness regardless of kernel configuration. - "mm/vmscan: reduce lru_lock contention via vmstat-derived scan-balance cost" (Usama Arif) Reduce lru_lock contention in the reclaim path by deriving scan-balance costs from vmstat counters rather than lock-acquired producer updates. Read and decay these cost signals on the reclaim side under a dedicated per-lruvec lock, reducing total LRU lock wait time by over 60% without impacting scan throughput. - "zram: fix zram issues reported by sashiko" (Sergey Senozhatsky) Fix two low-risk zram bugs which Sashiko spotted in drive-by review. - "Honor XA_FLAGS_ACCOUNT in xas_split_alloc() and charge to folio's memcg" (Zi Yan) Fix xas_split_alloc() by enabling target folio memcg charging during splits and adding the missing __GFP_ACCOUNT flag for proper XArray node memory accounting. - "selftests/mm: use pattern matching in .gitignore" (Pratyush Mallick) Replace hardcoded binary names in selftests/mm/.gitignore with a generic pattern-matching rule to automatically ignore generated test files and avoid manual updates when adding new tests. - "mm/page_ext: remove pgdat_page_ext_init()" (Sang-Heon Jeon) Make the incompatibility between FLATMEM and NUMA explicit in mm/Kconfig and remove the unused pgdat_page_ext_init() function. - "zram: fix zstd error paths and add parameter validation" (Haoqin Huang) Clean up zram compression backends by removing redundant error cleanup, adding parameter and dictionary validation, auto-prefixing algorithm error logs, and resetting parameters prior to reinitialization. - "zram: fix stale scan bounds after reinitialization" (Longlong Xia) Prevent out-of-bounds slot accesses during concurrent zram resets by moving table scan bound calculations under dev_lock in writeback_store() and read_block_state(). - "add anon mTHP collapse test cases" (Baolin Wang) Extend selftests helper functions to support arbitrary page orders and add new test cases and options for mTHP collapse in khugepaged. - "selftests/mm: Handle unsupported and transient test conditions" (Muhammad Usama Anjum) Update MM selftests to report a SKIP status instead of a failure when required kernel or filesystem features are unsupported, while adding retry logic for transient page migration errors. - "mm/zswap: Fixes and improves the zswap shrink" (Hao Jia) Fix the missing zswap global shrinker when CONFIG_MEMCG is disabled and extend shrink_memcg() to support batch writeback for improved writeback efficiency. - "alloc_tag: introduce IOCTL-based filtering for MAP" (Suren Baghdasaryan) Introduce an IOCTL-based binary interface for memory allocation profiling that enables kernel-side filtering before per-CPU counter aggregation. This eliminates the text-parsing overhead of /proc/allocinfo and provides up to a 20x speedup by transferring only filtered allocation data to userspace. - "better block swap batching and a different take on swap_ops v5" (Christoph Hellwig) Refactor block swap I/O to use swap_iocb for batching instead of single-bio requests and rebase the swap_ops interface, achieving faster swap throughput during kernel builds. - "mm: kmemleak: reduce transient false positives by confirming leaks" (Catalin Marinas) Reduce false-positive kmemleak reports by combining two kmemleak enhancements that add a second confirmation scan and a configurable minimum unreferenced scan count module parameter. - "mm: kmemleak: default min_unref_scans to 2 for verbose kernels" (Breno Leitao) Auto-scanning kernels can generate false-positive memory leak reports on single scans, so this patch defaults min_unref_scans to 2 when CONFIG_DEBUG_KMEMLEAK_VERBOSE is enabled to require a second confirming scan. - "swap_ops updates" (Christoph Hellwig) Batching I/O for synchronous swap devices causes performance regressions and filesystem-based swap suffers from double-indirection overhead. This series resolves both issues by reintroducing per-folio writes for synchronous swap and allowing filesystems to directly export their own swap_ops. - "mm/khugepaged: several cleanups" (Nico Pache) khugepaged accumulated redundant state-checking patterns and outdated comments following mTHP integration. Introduce dedicated helpers for PTE validation and event counting while refreshing the internal documentation. - "maple_tree: lock checking and clean ups" (Liam Howlett) Syzbot reports incorrectly blame memory management exit paths for locking bugs, maple tree erase operations risk allocation failures without gfp flags and internal documentation lacks clarity. Improve lock error detection, update docs, fix race and allocation edge cases and optimize erase allocations using a fallback to GFP_KERNEL | GFP_NOFAIL. * tag 'mm-stable-2026-08-26-15-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (172 commits) selftests/proc: make proc-maps-race work with READ_IMPLIES_EXEC memcg: move LRU size accounting on reparenting instead of copying it mm/vmscan: fix comment logic in balance_pgdat maple_tree: add helper mas_make_walkable() maple_tree: avoid extra gap calculation maple_tree: fix argument name in header maple_tree: change two GFP flags in tests maple_tree: document erase and allocations better maple_tree: avoid mas_erase() and mtree_erase() failures maple_tree: document that erase may use GFP_KERNEL for allocations maple_tree: catch race in mas_alloc_cyclic() maple_tree: add bulk parent set helper maple_tree: micro optimisation of mas_wr_store_type() maple_tree: optimise mas_wr_node_store() when not in rcu mode maple_tree: use prefetched value in mas_wr_store_type() maple_tree: clarify comments on mas_nomem() maple_tree: drop MAPLE_ALLOC_SLOTS maple_tree: drop dead code from mas_extend_spanning_null() maple_tree: documentation fix maple_tree: add write lock checking with lockdep sequence numbers ... |
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Song Hu
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73b5d07990 |
Docs/mm: fix outdated "radix tree" in page_migration
Steps 7 and 9 of the migration description still say "radix tree", unlike steps 5 and 11 which already use "i_pages lock". The page cache moved to the XArray at mapping->i_pages long ago. Use "page cache tree" for the two remaining references. Link: https://lore.kernel.org/20260812075739.325441-1-husong@kylinos.cn Signed-off-by: Song Hu <husong@kylinos.cn> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Suren Baghdasaryan
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1d581ab234 |
alloc_tag: add ioctl to /proc/allocinfo
Patch series "alloc_tag: introduce IOCTL-based filtering for MAP", v8. Currently, memory allocation profiling data is primarily exposed through /proc/allocinfo. While useful for manual inspection, this text-based interface poses challenges for production monitoring and large-scale analysis: 1. Userspace must parse large amounts of text to extract specific fields. 2. To find specific tags, userspace must read the entire dataset, requiring many context switches and high data copying. 3. The kernel currently aggregates per-CPU counters for every allocation size, even those the user intends to filter out immediately. This series introduces a new IOCTL-based binary interface for allocinfo that supports kernel-side filtering. By allowing the user to specify a filter mask, we significantly reduce the work performed in-kernel and the amount of data transferred to userspace. The IOCTL mechanism was chosen for allocinfo to address the per-CPU counter aggregation bottleneck. A traditional read() operation must report the total allocation count and sizes for every code tag in the system. Doing so requires iterating across all CPUs to sum their per-CPU counters for thousands of tags, which introduces substantial runtime overhead. The IOCTL interface allows userspace to push selective filtering criteria directly into the kernel before the per-CPU counter aggregation. The kernel aggregates per-CPU counters only for a small subset of tags that match the filter. This results in significant performance improvement. Beyond fast filtered retrieval, the IOCTL foundation allows introducing a context capture mechanism in the future to capture the context for specific allocations. Performance measurements were conducted on an Intel Xeon Platinum 8481C (224 CPUs) with caches dropped before each run. The IOCTL mechanism shows a ~20x performance improvement for filtered queries. The kernel avoids the expensive per-CPU counter aggregation (alloc_tag_read) for any tags that fail the initial string or location filters. Scenario 1: Specific File Filtering (arch/x86/events/rapl.c) 1. Traditional (cat /proc/allocinfo | grep): 22ms (sys) 2. IOCTL Interface: 1ms (sys) Scenario 2: Compound Filtering (Filename + Size) 1. Traditional: (cat ... | grep | awk): 21ms (sys) 2. IOCTL Interface: 1ms (sys) Scenario 3: Size-Based Filtering (min_size = 1MB) 1. Traditional: (cat ... | awk): 21ms (sys) 2. IOCTL Interface: 14ms (sys) This patch (of 6): Add the following ioctl commands for /proc/allocinfo file: ALLOCINFO_IOC_CONTENT_ID - gets content identifier which can be used to check whether the file content has changed specifically due to module load/unload. Every time a module is loaded / unloaded, the returned value will be different. By comparing the identifier value at the beginning and at the end of the content retrieval operation, users can validate retrieved information for consistency. ALLOCINFO_IOC_GET_AT - gets the record at the specified position. This is the position of a record in /proc/allocinfo. ALLOCINFO_IOC_GET_NEXT - gets the record next to the last retrieved one. If no records were previously retrieved, returns the first record. Note, function file and module names often have the same prefixes, therefore when filtering for them, we compare the last 64 characters to minimize the chances of name collisions. [akpm@linux-foundation.org: include compat.h, per Suren] Closes: https://lore.kernel.org/oe-kbuild-all/202607091820.qbjlGhKK-lkp@intel.com/ Link: https://lore.kernel.org/cover.1783532853.git.abhishekbapat@google.com Link: https://lore.kernel.org/15596de2607ef13e7c77c6d74763f4ae992ec475.1783532853.git.abhishekbapat@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Abhishek Bapat <abhishekbapat@google.com> Acked-by: Hao Ge <hao.ge@linux.dev> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: Sourav Panda <souravpanda@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Abhishek Bapat
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afff109c2f |
alloc_tag: expose boot-time compression configuration
Currently, userspace has limited visibility into the exact active runtime
state of memory allocation profiling and its page extension compression
('sysctl.vm.mem_profiling={0|1|never}[,compressed]').
While reading the sysctl provides basic on/off status, it is currently
impossible for userspace to natively determine whether page-tag
compression was successfully enabled without scraping dmesg boot logs.
Add a new read-only sysctl representing how compression was configured
at boot time.
Link: https://lore.kernel.org/c795f8089f82841e8a6e00d7ca286da2b23aeb7b.1785950530.git.abhishekbapat@google.com
Signed-off-by: Abhishek Bapat <abhishekbapat@google.com>
Acked-by: Suren Baghdasaryan <surenb@google.com>
Cc: Hao Ge <hao.ge@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Hongfu Li
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a44ab4bd1e |
ksm: update comments and docs to reference folio->mapping
The KSM code already stores and checks the stable node key via folio->mapping, but the comment in ksm_get_folio() and the reverse mapping documentation in ksm.rst still refer to page->mapping. This is a pure wording update to match the folio-based implementation. No functional change is intended. Link: https://lore.kernel.org/20260805105927.41987-1-hongfu.li@linux.dev Signed-off-by: Hongfu Li <lihongfu@kylinos.cn> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Xu Xin <xu.xin16@zte.com.cn> Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn> Cc: Alex Shi <alexs@kernel.org> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Yanteng Si <si.yanteng@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linus Torvalds
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918e25291c |
slab changes for 7.3
-----BEGIN PGP SIGNATURE----- iQFPBAABCAA5FiEEe7vIQRWZI0iWSE3xu+CwddJFiJoFAmqMSHQbFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMiwyAAoJELvgsHXSRYiaC8EH/ihctMRDnqbUxyc3cSIZ cuy3ocSSu8UnHzSNarylY8sVYIYflgY6owV7UvaUKmXGYHiHIDdI5NMDzpjola7X Ct7mpIuobFHpFhTQMqvYkeEQ3EytS7NPHKs3jd6t2HSOYJdY4lghjRZcxOlo7+GA 5EJa468TSHswWbT34e3NY7gpoHCXTucR6FBqoVtluLOliQWNMkWbeDQ9hEnMoyNy hEdooWDxt8vBuSqVRCZxrgJRK2nauf1P/CHZm4HcNttOQp0iwr8Q7GER7dBpW0jR 1b1zM9YPH4g6CSll5V6sWSMUNAaDx3Akx3ZyKhd3G2kyP3HkPXKSag/fS8xxCFLN hh0= =6lTR -----END PGP SIGNATURE----- Merge tag 'slab-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab Pull slab updates from Vlastimil Babka: - Add kfree_rcu_nolock() that can be used from contexts where spinning on a lock might be unsafe, such as a BPF program attached to an arbitrary function, or in NMI context. This complements the existing kfree_nolock() support (Harry Yoo) - Runtime instead of compile-time slabobj_ext sizing. Avoid wasting memory when memory allocation profiling is compiled but not enabled, with initial partial support to also avoid wasting memory for objcg pointers when those are not needed, while profiling is enabled (Vlastimil Babka) - Various non-urgent fixes, cleanups and optimizations (Hao Li, Hongling Zeng, Li RongQing, Li Xiasong, Seongjun Hong, Shengming Hu) * tag 'slab-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: (31 commits) mm/slab, kfence, memcg: completely remove obj_ext for kfence objects mm/slab: stop allocating objcg pointers when unnecessary mm/slab: add cache_ and slab_needs_objcg() helpers mm/slab: stop exporting kvfree_rcu_barrier[_on_cache]() slub_kunit: extend the test for kfree_rcu_nolock() mm/slab: introduce kfree_rcu_nolock() mm/slab: introduce struct kvfree_rcu_head for kvfree_rcu batching mm/slab: reduce slabobj_ext memory with allocation profiling disabled mm/slab: introduce slab_obj_ext_has_codetag() mm/slab: allow kfree_rcu_sheaf() on PREEMPT_RT mm/slab: extend deferred free mechanism to handle rcu sheaves mm/slab: use call_rcu() in unknown context if irqs are enabled mm/slab: handle the !allow_spin case in kfree_rcu_sheaf() mm/slab: change struct slabobj_ext to a union mm/slab: replace slab.stride with obj_exts_in_object mm/slab: abstract slabobj_ext.ref access mm/slab: abstract slabobj_ext.objcg access mm/slab: make slab_obj_ext() determine object index mm: move struct slabobj_ext to mm/slab.h mm/slab: remove objs_per_slab() ... |
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Zenghui Yu (Huawei)
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c2875056e1 |
docs/mm: Physical Memory: remove deferred_split_queue
deferred_split_queue was removed from struct pglist_data {} in commit
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Manuel Ebner
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e105f1aa27 |
docs/mm: fix braces
Correct typos in mm documentation by balancing parentheses. Link: https://lore.kernel.org/20260629161156.90213-2-manuelebner@mailbox.org Signed-off-by: Manuel Ebner <manuelebner@mailbox.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Lorenzo Stoakes <ljs@kernel.org> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Vishal Moola <vishal.moola@gmail.com> Reviewed-by: SJ Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Stanislav Kinsburskii
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1211708312 |
mm/hmm: add hmm_range_fault_unlocked_timeout() for mmap lock-drop support
hmm_range_fault() requires the caller to hold the mmap read lock for the duration of the call. This is incompatible with mappings whose fault handler may release the mmap lock, notably userfaultfd-managed regions, where handle_mm_fault() can return VM_FAULT_RETRY or VM_FAULT_COMPLETED after dropping the lock. Drivers that need to populate device page tables for such mappings have no way to do so today. Add hmm_range_fault_unlocked_timeout() for callers that do not need to hold mmap_lock across any work outside the HMM fault itself. The helper takes mmap_read_lock_killable() internally, calls the common HMM fault implementation, and releases the lock before returning if it is still held. The timeout is specified in jiffies; passing 0 retries indefinitely, while a non-zero timeout makes the helper return -EBUSY when the retry budget expires. The retry deadline is set before refreshing the notifier sequence and acquiring mmap_lock, so contended mmap_lock acquisition is included in the retry budget. After acquiring mmap_lock, the helper also rejects unstable address spaces before walking page tables. When handle_mm_fault() drops mmap_lock, or when the range is invalidated, hmm_range_fault_unlocked_timeout() refreshes range->notifier_seq and retries the walk internally. If the lock was dropped, the retry deadline is also restarted because a lock-dropping fault handler made progress. Ordinary -EBUSY retries keep the existing deadline, preserving the caller's timeout policy for repeated mmu-notifier invalidations. The caller only needs to perform the usual post-success mmu_interval_read_retry() check while holding its update lock before consuming the pfns. If mmap_lock acquisition is interrupted or a fatal signal is pending during retry handling, -EINTR is returned instead. The common implementation conditionally sets FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_KILLABLE only for hmm_range_fault_unlocked_timeout(). The existing hmm_range_fault() path still passes no locked state, does not allow handle_mm_fault() to drop mmap_lock, and remains a thin wrapper preserving the existing API contract for current callers. The previous refactor that moved page fault handling out of the page-table walk callbacks is what makes this change small. Faults now run after walk_page_range() has unwound, with only mmap_lock held, so dropping it does not interact with the walker's pte spinlock or hugetlb_vma_lock. Hugetlb regions therefore participate in the unlocked path uniformly with PTE- and PMD-level mappings; no special case is required. Documentation/mm/hmm.rst is updated with a description of the new API and the recommended caller pattern. Link: https://lore.kernel.org/20260723-hmm-v10-v11-2-c55b003a4b61@gmail.com Signed-off-by: Stanislav Kinsburskii <skinsburskii@gmail.com> Cc: Danilo Krummrich <dakr@kernel.org> Cc: Dave Airlie <airlied@gmail.com> Cc: David Hildenbrand <david@kernel.org> Cc: Dexuan Cui <decui@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Leon Romanovsky <leon@kernel.org> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lizhi Hou <lizhi.hou@amd.com> Cc: Long Li <longli@microsoft.com> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Lyude <lyude@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oded Gabbay <ogabbay@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Zimemrmann <tzimmermann@suse.de> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Wei Liu <wei.liu@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SJ Park
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3baf78e04b |
Docs/admin-guide/mm/damon/usage: document weight sysfs file
Update DAMON usage document for newly added probe weight file. Link: https://lore.kernel.org/20260710134651.18084-19-sj@kernel.org Signed-off-by: SJ Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SJ Park
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f10489d2ef |
Docs/mm/damon/design: document attrs-only monitoring
Update DAMON design document for the attributes only monitoring mode. Link: https://lore.kernel.org/20260710134651.18084-18-sj@kernel.org Signed-off-by: SJ Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Vlastimil Babka (SUSE)
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3a11935cd3 |
mm/slab: skip kfence objects in allocation profiling
struct kfence_metadata only contains struct slabobj_ext with CONFIG_MEMCG, which is then used for the "fake" slab's obj_exts field. If CONFIG_MEMCG is enabled, the struct can also end up used for memory allocation profiling. If CONFIG_MEMCG is disabled but profiling is enabled, it will end up allocating its obj_exts via prepare_slab_obj_exts_hook() and assigning them to the fake struct slab. These will probably then never be freed. So things sorta work, but not always in the intended and optimal way. The upcoming changes to slabobj_ext layout would additionally need a proper refactoring to keep working. However, there's little benefit in accounting KFENCE objects. KFENCE allocations are rare and there can be only CONFIG_KFENCE_NUM_OBJECTS (default to 255) outstanding ones at any time. For any callsite prominent enough in the memory allocation profiling stats, allocations served from KFENCE will be lost in the noise. Thus let's not complicate things and simply stop accounting KFENCE objects in allocation profiling and skip them in the related slab hooks. We also need to skip kfence objects in mark_obj_codetag_empty() in case a sheaf is allocated from kfence, per earlier sashiko review. Link: https://patch.msgid.link/20260727-b4-objext_split-v3-1-c29ef0f1f257@kernel.org Reviewed-by: Hao Li <hao.li@linux.dev> Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> |
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SJ Park
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6eceb61256 |
Docs/mm/damon/design: update for DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP
Patch series "mm/damon: update, optimize, and clean up doc, tests, and
code".
Patches 1 and 2 update the design and ABI documents for recently added
DAMON features. Patches 3-7 add or update more unit and self tests for
DAMON to cover recently changed or added functions and sysfs files. Patch
8 optimizes damon_commit_target_regions() to skip unnecessary adjacent
ranges setup. Patches 9-11 clean and fix up recently added DAMON sysfs
interface code for readability.
This patch (of 11):
Commit
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Doehyun Baek
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914a458277 |
Docs/{admin-guide,mm}/damon: fix DAMON documentation details
Fix minor DAMON documentation issues. Correct the sysfs scheme file name apply_interval_us, the DAMON_STAT module count, a malformed reference, a misplaced label indentation, and a few typos. Link: https://lore.kernel.org/20260629145538.134832-4-sj@kernel.org Signed-off-by: Doehyun Baek <doehyunbaek@gmail.com> Signed-off-by: SJ Park <sj@kernel.org> Reviewed-by: SJ Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: "Liam R. Howlett" <liam@infradead.org> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Asier Gutierrez <gutierrez.asier@huawei-partners.com> Cc: Brendan Higgins <brendan.higgins@linux.dev> Cc: Philippe Laferriere <plafer@proton.me> Cc: Sailesh Nandanavanam <saileshnandanavanam@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Zhen Ni
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e2c75342c2 |
mm/page_owner: document page_owner filter
Add documentation for the page_owner_filter userspace tool and kernel-level filtering features. [rdunlap@infradead.org: avoid docs build warning] Link: https://lore.kernel.org/20260708213548.469155-1-rdunlap@infradead.org Link: https://lore.kernel.org/20260707115411.1714314-5-zhen.ni@easystack.cn Signed-off-by: Zhen Ni <zhen.ni@easystack.cn> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Acked-by: Zi Yan <ziy@nvidia.com> Cc: Brendan Jackman <jackmanb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linus Torvalds
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da07894d1d |
A handful of late-arriving docs fixes, along with one document update
that fell through the cracks before. -----BEGIN PGP SIGNATURE----- iQFDBAABCgAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAmo9JLAPHGNvcmJldEBs d24ubmV0AAoJEBdDWhNsDH5Y78sH/jWxQF61bEtdwa4RbO8xw/4j2HK2GPguynK+ ctdYQE0V6lLwcsPyvu5IPoHXXJ+z3RAyNkRu/n6/LTIFGQ0Z4lXOyu3fjVYhC2Tw QXVWp0G1Wb5gHVdW9g2KwXWv2U/9Z2HIftr3RlXbr+Zt8aIn+A4kqsjuQI5y7Dlu 4aTRI0xjeRhSZHUT1dwlaqV9vH3MB/lgwmnbHCKF2uxuRK3K/1HfNppnPdBkmKyA bru70pdw7PR+m87H+9sCr99T4YfrLFGRdOdM/pO+BsmmuSeC8SIWKaAHKWQJAn1A WGZdnuiZON8jV9RpwRK7BSeW/k7QxjO9TYxM96xBLQQuAo2REec= =jpJf -----END PGP SIGNATURE----- Merge tag 'docs-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux Pull more documentation updates from Jonathan Corbet: "A handful of late-arriving docs fixes, along with one document update that fell through the cracks before" * tag 'docs-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: docs: tools: Fix typo 'ackward' to 'awkward' in unittest.rst kdoc: xforms: ignore special static/inline macros kdoc: xforms_lists: handle DECLARE_PER_CPU() in kernel-doc MAINTAINERS: Fix regex for kdoc docs: kgdb: Fix path of driver options Documentation: tracing: fix typo in events documentation Docs/driver-api/uio-howto: document mmap_prepare callback docs/mm: clarify that we are not looking for LLM generated content kernel-doc: xforms: support __SYSFS_FUNCTION_ALTERNATIVE() |
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David Hildenbrand (Arm)
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afb5a55498 |
docs/mm: clarify that we are not looking for LLM generated content
Let's make it clear that we are not looking for LLM generated content from contributors not familiar with the details of MM, as it shifts the real work onto reviewers. Signed-off-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: Dev Jain <dev.jain@arm.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Zi Yan <ziy@nvidia.com> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Reviewed-by: Lorenzo Stoakes <ljs@kernel.org> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Harry Yoo (Oracle) <harry@kernel.org> Acked-by: SeongJae Park <sj@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260420-llmdoc-v1-1-47d2091177c4@kernel.org> |
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Linus Torvalds
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d639d9fa16 |
liveupdate: updates for 7.2-rc1
- kho: make memory preservation compatible with deferred initialization of
the memory map
- luo: add LIVEUPDATE_SESSION_GET_NAME ioctl and parameter verification for
LIVEUPDATE_IOCTL_CREATE_SESSION ioctl
- luo: documentation updates for liveupdate=on command line option, systemd
support and the current compatibility status
- luo: remove the fixed limits on the number of files that can be preserved
within a single session, and the total number of sessions managed by the
Live Update Orchestrator
- fixes that didn't cut as urgent and were delayed until the merge window:
* reference count incoming File-Lifecycle-Bound (FLB) data so it cannot
be freed while a subsystem is still using it
* fixes for a TOCTOU race in luo_session_retrieve(), a use-after-free in
the file finish and unpreserve paths, concurrent session mutations
during reboot and serialization on preserve_context kexec
* make sure ioctls for incoming LUO sessions are blocked for outgoing
sessions and vice versa
* make sure KHO scratch size is always aligned by CMA_MIN_ALIGNMENT_BYTES
* fix memblock tests build issue introduced by KHO changes
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Merge tag 'liveupdate-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux
Pull liveupdate updates from Mike Rapoport:
"Kexec Handover (KHO):
- make memory preservation compatible with deferred initialization
of the memory map
Live Update Orchestrator (LUO):
- add LIVEUPDATE_SESSION_GET_NAME ioctl and parameter verification
for LIVEUPDATE_IOCTL_CREATE_SESSION ioctl
- documentation updates for liveupdate=on command line option,
systemd support and the current compatibility status
- remove the fixed limits on the number of files that can be
preserved within a single session, and the total number of
sessions managed by the LUO
Misc fixes:
- reference count incoming File-Lifecycle-Bound (FLB) data so
it cannot be freed while a subsystem is still using it
- fixes for a TOCTOU race in luo_session_retrieve(), a use-
after-free in the file finish and unpreserve paths, concurrent
session mutations during reboot and serialization on
preserve_context kexec
- make sure ioctls for incoming LUO sessions are blocked for
outgoing sessions and vice versa
- make sure KHO scratch size is always aligned by
CMA_MIN_ALIGNMENT_BYTES
- fix memblock tests build issue introduced by KHO changes"
* tag 'liveupdate-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux: (36 commits)
liveupdate: Document that retrieve failure is permanent
docs: memfd_preservation: fix rendering of ABI documentation
selftests/liveupdate: Add stress-files kexec test
selftests/liveupdate: Add stress-sessions kexec test
selftests/liveupdate: Test session and file limit removal
liveupdate: Remove limit on the number of files per session
liveupdate: Remove limit on the number of sessions
liveupdate: defer session block allocation and physical address setting
kho: add support for linked-block serialization
liveupdate: Extract luo_session_deserialize_one helper
liveupdate: Extract luo_file_deserialize_one helper
liveupdate: register luo_ser as KHO subtree
liveupdate: centralize state management into struct luo_ser
liveupdate: avoid mixing cleanup guards with goto in luo_session_retrieve_fd
liveupdate: change file_set->count type to u64 for type safety
liveupdate: Remove unused ser field from struct luo_session
liveupdate: fix u-a-f in luo_file_unpreserve_files() and luo_file_finish()
liveupdate: block session mutations during reboot
liveupdate: fix TOCTOU race in luo_session_retrieve()
liveupdate: skip serialization for context-preserving kexec
...
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Pratyush Yadav (Google)
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3a358c7809 |
docs: memfd_preservation: fix rendering of ABI documentation
The "memfd Live Update ABI" section in include/linux/kho/abi/memfd.h
currently does not render in the exported documentation. This is because
it should not include the "DOC:" in its reference. Drop it to ensure
correct rendering. Tested by running make htmldocs.
Fixes:
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Sakurai Shun
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de5480aeff |
Docs/mm/damon/design: fix three typos
L140: "unsinged" -> "unsigned" L371: "sampleing" -> "sampling" L387: "multipled" -> "multiplied" Link: https://lore.kernel.org/20260520012104.93602-3-sj@kernel.org Signed-off-by: Sakurai Shun <ssh1326@icloud.com> Signed-off-by: SeongJae Park <sj@kernel.org> Reviewed-by: Lorenzo Stoakes <ljs@kernel.org> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: niecheng <niecheng1@uniontech.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Zenghui Yu <zenghui.yu@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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2fd777ebdf |
Docs/mm/damon/design: update for memcg damon filter
Update DAMON design document for the newly added belonging memory cgroup attribute monitoring feature. Link: https://lore.kernel.org/20260518234119.97569-28-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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69a7435201 |
Docs/admin-guide/mm/damon/usage: document data attributes monitoring
Update DAMON usage document for the newly added data attributes monitoring feature. Link: https://lore.kernel.org/20260518234119.97569-22-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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f4e9895423 |
Docs/mm/damon/design: document data attributes monitoring
Update DAMON design document for newly added data attributes monitoring feature. Link: https://lore.kernel.org/20260518234119.97569-21-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Sakurai Shun
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0c946c54a7 |
docs/mm: fix typo in process_addrs.rst
Replace "presense" with "presence" Link: https://lore.kernel.org/20260517103640.45444-1-ssh1326@icloud.com Signed-off-by: Sakurai Shun <ssh1326@icloud.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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60bee40e30 |
Docs/mm/damon/design: update for context pause/resume feature
Update DAMON design document for the context execution pause/resume feature. Link: https://lore.kernel.org/20260427151231.113429-4-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Brendan Higgins <brendan.higgins@linux.dev> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Asier Gutierrez
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58996503b6 |
mm/damon: support MADV_COLLAPSE via DAMOS_COLLAPSE scheme action
This patch set introces a new action: DAMOS_COLLAPSE. For DAMOS_HUGEPAGE and DAMOS_NOHUGEPAGE to work, khugepaged should be working, since it relies on hugepage_madvise to add a new slot. This slot should be picked up by khugepaged and eventually collapse (or not, if we are using DAMOS_NOHUGEPAGE) the pages. If THP is not enabled, khugepaged will not be working, and therefore no collapse will happen. DAMOS_COLLAPSE eventually calls madvise_collapse, which will collapse the address range synchronously. In cases where there is a large VMA (databases, for example), DAMOS_COLLAPSE allows us to collapse only the hot region, and not the entire VMA. This new action may be required to support autotuning with hugepage as a goal[1]. ========= Benchmarks: ========= MySQL ===== Tests were performed in an ARM physical server with MariaDB 10.5 and sysbench. Read only benchmark was perform with gaussian row hitting, which follows a normal distribution. T n, D h: THP set to never, DAMON action set to hugepage T m, D h: THP set to madvise, DAMON action set to hugepage T n, D c: THP set to never, DAMON action set to collapse Memory consumption. Lower is better. +------------------+----------+----------+----------+ | | T n, D h | T m, D h | T n, D c | +------------------+----------+----------+----------+ | Total memory use | 2.13 | 2.20 | 2.20 | | Huge pages | 0 | 1.3 | 1.27 | +------------------+----------+----------+----------+ Performance in TPS (Transactions Per Second). Higher is better. T n, D h: 18225.58 T m, D h 18252.93 T n, D c: 18270.21 Performance counter I got the number of L1 D/I TLB accesses and the number a D/I TLB accesses that triggered a page walk. I divided the second by the first to get the percentage of page walkes per TLB access. The lower the better. +---------------+--------------+--------------+--------------+ | | T n, D h | T m, D h | T n, D c | +---------------+--------------+--------------+--------------+ | L1 DTLB | 127248242753 | 125431020479 | 125327001821 | | L1 ITLB | 80332558619 | 79346759071 | 79298139590 | | DTLB walk | 75011087 | 52800418 | 55895794 | | ITLB walk | 71577076 | 71505137 | 67262140 | | DTLB % misses | 0.058948623 | 0.042095183 | 0.044599961 | | ITLB % misses | 0.089100954 | 0.090117275 | 0.084821839 | +---------------+--------------+--------------+--------------+ Masim ===== I used masim with the "demo" configuration, but changing the times to 100 seconds for the initial phase and 50 seconds for the rest of the phases. Memory consumption: +------------------+----------+----------+----------+ | | T n, D h | T m, D h | T n, D c | +------------------+----------+----------+----------+ | Total memory use | 2.38 GB | 2.36 GB | 2.37 GB | | Huge pages | 0 | 190 MB | 188 MB | +------------------+----------+----------+----------+ Performance: THP never, DAMOS_HUGEPAGE initial phase: 40,491 accesses/msec, 100001 msecs run low phase 0: 39,658 accesses/msec, 50002 msecs run high phase 0: 41,678 accesses/msec, 50000 msecs run low phase 1: 39,625 accesses/msec, 50003 msecs run high phase 1: 41,658 accesses/msec, 50002 msecs run low phase 2: 39,642 accesses/msec, 50002 msecs run high phase 2: 41,640 accesses/msec, 50001 msecs run THP madvise, DAMOS_HUGEPAGE initial phase: 51,977 accesses/msec, 100000 msecs run low phase 0: 86,953 accesses/msec, 50000 msecs run high phase 0: 94,812 accesses/msec, 50000 msecs run low phase 1: 101,017 accesses/msec, 50000 msecs run high phase 1: 94,841 accesses/msec, 50000 msecs run low phase 2: 100,993 accesses/msec, 50000 msecs run high phase 2: 94,791 accesses/msec, 50001 msecs run THP never, DAMOS_COLLAPSE initial phase: 93,678 accesses/msec, 100001 msecs run low phase 0: 101,475 accesses/msec, 50000 msecs run high phase 0: 98,589 accesses/msec, 50000 msecs run low phase 1: 101,531 accesses/msec, 50001 msecs run high phase 1: 98,506 accesses/msec, 50001 msecs run low phase 2: 101,458 accesses/msec, 50001 msecs run high phase 2: 98,555 accesses/msec, 50000 msecs run Memory consumption dynamic (how quickly collapses occur): It shows in seconds how many huge pages are allocated. +----+----------+----------+ | | T m, D h | T n, D c | +----+----------+----------+ | 5 | 32 | 188 | | 10 | 48 | 188 | | 15 | 64 | 188 | | 20 | 96 | 188 | | 30 | 112 | 188 | | 35 | 144 | 188 | | 40 | 160 | 188 | | 45 | 190 | 188 | | 50 | 190 | 188 | | 55 | 190 | 188 | | 60 | 190 | 188 | +----+----------+----------+ ========= - We can see that DAMOS "hugepage" action works only when THP is set to madvise. "collapse" action works even when THP is set to never. - Performance for "collapse" action is slightly lower than "hugepage" action and THP madvise. This is due to the fact that collapases occur synchronously. With "hugepage" they may occur during page faults. - Memory consumption is slighly lower for "collapse" than "hugepage" with THP madvise. This is due to the khugepage collapses all VMAs, while "collapse" action only collapses the VMAs in the hot region. - There is an improvement in TLB utilization when collapse through "hugepage" or "collapse" actions are triggered. The amount of TLB misses is lower. - "collapse" action is performance synchronously, which means that page collapses happen earlier and more rapidly. This can be useful or not, depending on the scenario. - "hugepage" action may trigger a VMA split in some scenarios, since it needs to change the flag of the VMA to THP enabled. This may lead to additional overhead. Collapse action just adds a new option to chose the correct system balance. Link: https://lore.kernel.org/20260426231619.107231-5-sj@kernel.org Link: https://lore.kernel.org/damon/20260313000816.79933-1-sj@kernel.org/ [1] Signed-off-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com> Signed-off-by: SeongJae Park <sj@kernel.org> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: Cheng-Han Wu <hank20010209@gmail.com> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Liew Rui Yan <aethernet65535@gmail.com> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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8c2c7df58b |
Docs/mm/damon/maintainer-profile: add AI review usage guideline
DAMON is opted-in for DAMON patches scanning [1] and email delivery [2]. Clarify how that could be used on DAMON maintainer profile. Link: https://lore.kernel.org/20260412211932.89038-1-sj@kernel.org Link: https://github.com/sashiko-dev/sashiko/commit/ad9f4a98f958 [1] Link: https://github.com/sashiko-dev/sashiko/commit/b554c7b6e733 [2] Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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776270536d |
Docs/mm/damon/design: document fail_charge_{num,denom}
Update DAMON design document for the DAMOS action failed region quota charge ratio. Link: https://lore.kernel.org/20260428013402.115171-6-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Brendan Higgins <brendan.higgins@linux.dev> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linus Torvalds
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334fbe734e |
mm.git review status for linus..mm-stable
Everything: Total patches: 368 Reviews/patch: 1.56 Reviewed rate: 74% Excluding DAMON: Total patches: 316 Reviews/patch: 1.77 Reviewed rate: 81% Excluding DAMON and zram: Total patches: 306 Reviews/patch: 1.81 Reviewed rate: 82% Excluding DAMON, zram and maple_tree: Total patches: 276 Reviews/patch: 2.01 Reviewed rate: 91% Significant patch series in this merge: - The 30 patch series "maple_tree: Replace big node with maple copy" from Liam Howlett is mainly prepararatory work for ongoing development but it does reduce stack usage and is an improvement. - The 12 patch series "mm, swap: swap table phase III: remove swap_map" from Kairui Song offers memory savings by removing the static swap_map. It also yields some CPU savings and implements several cleanups. - The 2 patch series "mm: memfd_luo: preserve file seals" from Pratyush Yadav adds file seal preservation to LUO's memfd code. - The 2 patch series "mm: zswap: add per-memcg stat for incompressible pages" from Jiayuan Chen adds additional userspace stats reportng to zswap. - The 4 patch series "arch, mm: consolidate empty_zero_page" from Mike Rapoport implements some cleanups for our handling of ZERO_PAGE() and zero_pfn. - The 2 patch series "mm/kmemleak: Improve scan_should_stop() implementation" from Zhongqiu Han provides an robustness improvement and some cleanups in the kmemleak code. - The 4 patch series "Improve khugepaged scan logic" from Vernon Yang "improves the khugepaged scan logic and reduces CPU consumption by prioritizing scanning tasks that access memory frequently". - The 2 patch series "Make KHO Stateless" from Jason Miu simplifies Kexec Handover by "transitioning KHO from an xarray-based metadata tracking system with serialization to a radix tree data structure that can be passed directly to the next kernel" - The 3 patch series "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" from Thomas Ballasi and Steven Rostedt enhances vmscan's tracepointing. - The 5 patch series "mm: arch/shstk: Common shadow stack mapping helper and VM_NOHUGEPAGE" from Catalin Marinas is a cleanup for the shadow stack code: remove per-arch code in favour of a generic implementation. - The 2 patch series "Fix KASAN support for KHO restored vmalloc regions" from Pasha Tatashin fixes a WARN() which can be emitted the KHO restores a vmalloc area. - The 4 patch series "mm: Remove stray references to pagevec" from Tal Zussman provides several cleanups, mainly udpating references to "struct pagevec", which became folio_batch three years ago. - The 17 patch series "mm: Eliminate fake head pages from vmemmap optimization" from Kiryl Shutsemau simplifies the HugeTLB vmemmap optimization (HVO) by changing how tail pages encode their relationship to the head page. - The 2 patch series "mm/damon/core: improve DAMOS quota efficiency for core layer filters" from SeongJae Park improves two problematic behaviors of DAMOS that makes it less efficient when core layer filters are used. - The 3 patch series "mm/damon: strictly respect min_nr_regions" from SeongJae Park improves DAMON usability by extending the treatment of the min_nr_regions user-settable parameter. - The 3 patch series "mm/page_alloc: pcp locking cleanup" from Vlastimil Babka is a proper fix for a previously hotfixed SMP=n issue. Code simplifications and cleanups ennsed. - The 16 patch series "mm: cleanups around unmapping / zapping" from David Hildenbrand implements "a bunch of cleanups around unmapping and zapping. Mostly simplifications, code movements, documentation and renaming of zapping functions". - The 6 patch series "support batched checking of the young flag for MGLRU" from Baolin Wang supports batched checking of the young flag for MGLRU. It's part cleanups; one benchmark shows large performance benefits for arm64. - The 5 patch series "memcg: obj stock and slab stat caching cleanups" from Johannes Weiner provides memcg cleanup and robustness improvements. - The 5 patch series "Allow order zero pages in page reporting" from Yuvraj Sakshith enhances page_reporting's free page reporting - it is presently and undesirably order-0 pages when reporting free memory. - The 6 patch series "mm: vma flag tweaks" from Lorenzo Stoakes is cleanup work following from the recent conversion of the VMA flags to a bitmap. - The 10 patch series "mm/damon: add optional debugging-purpose sanity checks" from SeongJae Park adds some more developer-facing debug checks into DAMON core. - The 2 patch series "mm/damon: test and document power-of-2 min_region_sz requirement" from SeongJae Park adds an additional DAMON kunit test and makes some adjustments to the addr_unit parameter handling. - The 3 patch series "mm/damon/core: make passed_sample_intervals comparisons overflow-safe" from SeongJae Park fixes a hard-to-hit time overflow issue in DAMON core. - The 7 patch series "mm/damon: improve/fixup/update ratio calculation, test and documentation" from SeongJae Park is a "batch of misc/minor improvements and fixups" for DAMON. - The 4 patch series "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" from David Hildenbrand fixes a possible issue with dax-device when CONFIG_HUGETLB=n. Some code movement was required. - The 6 patch series "zram: recompression cleanups and tweaks" from Sergey Senozhatsky provides "a somewhat random mix of fixups, recompression cleanups and improvements" in the zram code. - The 11 patch series "mm/damon: support multiple goal-based quota tuning algorithms" from SeongJae Park extend DAMOS quotas goal auto-tuning to support multiple tuning algorithms that users can select. - The 4 patch series "mm: thp: reduce unnecessary start_stop_khugepaged()" from Breno Leitao fixes the khugpaged sysfs handling so we no longer spam the logs with reams of junk when starting/stopping khugepaged. - The 3 patch series "mm: improve map count checks" from Lorenzo Stoakes provides some cleanups and slight fixes in the mremap, mmap and vma code. - The 5 patch series "mm/damon: support addr_unit on default monitoring targets for modules" from SeongJae Park extends the use of DAMON core's addr_unit tunable. - The 5 patch series "mm: khugepaged cleanups and mTHP prerequisites" from Nico Pache provides cleanups in the khugepaged and is a base for Nico's planned khugepaged mTHP support. - The 15 patch series "mm: memory hot(un)plug and SPARSEMEM cleanups" from David Hildenbrand implements code movement and cleanups in the memhotplug and sparsemem code. - The 2 patch series "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup CONFIG_MIGRATION" from David Hildenbrand rationalizes some memhotplug Kconfig support. - The 6 patch series "change young flag check functions to return bool" from Baolin Wang is "a cleanup patchset to change all young flag check functions to return bool". - The 3 patch series "mm/damon/sysfs: fix memory leak and NULL dereference issues" from Josh Law and SeongJae Park fixes a few potential DAMON bugs. - The 25 patch series "mm/vma: convert vm_flags_t to vma_flags_t in vma code" from "converts a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it". Mainly in the vma code. - The 21 patch series "mm: expand mmap_prepare functionality and usage" from Lorenzo Stoakes "expands the mmap_prepare functionality, which is intended to replace the deprecated f_op->mmap hook which has been the source of bugs and security issues for some time". Cleanups, documentation, extension of mmap_prepare into filesystem drivers. - The 13 patch series "mm/huge_memory: refactor zap_huge_pmd()" from Lorenzo Stoakes simplifies and cleans up zap_huge_pmd(). Additional cleanups around vm_normal_folio_pmd() and the softleaf functionality are performed. -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCad3HDQAKCRDdBJ7gKXxA jrUQAPwNhPk5nPSxnyxjAeQtOBHqgCdnICeEismLajPKd9aYRgEA0s2XAu3tSUYi GrBnWImHG3s4ePQxVcPCegWTsOUrXgQ= =1Q7o -----END PGP SIGNATURE----- Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull MM updates from Andrew Morton: - "maple_tree: Replace big node with maple copy" (Liam Howlett) Mainly prepararatory work for ongoing development but it does reduce stack usage and is an improvement. - "mm, swap: swap table phase III: remove swap_map" (Kairui Song) Offers memory savings by removing the static swap_map. It also yields some CPU savings and implements several cleanups. - "mm: memfd_luo: preserve file seals" (Pratyush Yadav) File seal preservation to LUO's memfd code - "mm: zswap: add per-memcg stat for incompressible pages" (Jiayuan Chen) Additional userspace stats reportng to zswap - "arch, mm: consolidate empty_zero_page" (Mike Rapoport) Some cleanups for our handling of ZERO_PAGE() and zero_pfn - "mm/kmemleak: Improve scan_should_stop() implementation" (Zhongqiu Han) A robustness improvement and some cleanups in the kmemleak code - "Improve khugepaged scan logic" (Vernon Yang) Improve khugepaged scan logic and reduce CPU consumption by prioritizing scanning tasks that access memory frequently - "Make KHO Stateless" (Jason Miu) Simplify Kexec Handover by transitioning KHO from an xarray-based metadata tracking system with serialization to a radix tree data structure that can be passed directly to the next kernel - "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" (Thomas Ballasi and Steven Rostedt) Enhance vmscan's tracepointing - "mm: arch/shstk: Common shadow stack mapping helper and VM_NOHUGEPAGE" (Catalin Marinas) Cleanup for the shadow stack code: remove per-arch code in favour of a generic implementation - "Fix KASAN support for KHO restored vmalloc regions" (Pasha Tatashin) Fix a WARN() which can be emitted the KHO restores a vmalloc area - "mm: Remove stray references to pagevec" (Tal Zussman) Several cleanups, mainly udpating references to "struct pagevec", which became folio_batch three years ago - "mm: Eliminate fake head pages from vmemmap optimization" (Kiryl Shutsemau) Simplify the HugeTLB vmemmap optimization (HVO) by changing how tail pages encode their relationship to the head page - "mm/damon/core: improve DAMOS quota efficiency for core layer filters" (SeongJae Park) Improve two problematic behaviors of DAMOS that makes it less efficient when core layer filters are used - "mm/damon: strictly respect min_nr_regions" (SeongJae Park) Improve DAMON usability by extending the treatment of the min_nr_regions user-settable parameter - "mm/page_alloc: pcp locking cleanup" (Vlastimil Babka) The proper fix for a previously hotfixed SMP=n issue. Code simplifications and cleanups ensued - "mm: cleanups around unmapping / zapping" (David Hildenbrand) A bunch of cleanups around unmapping and zapping. Mostly simplifications, code movements, documentation and renaming of zapping functions - "support batched checking of the young flag for MGLRU" (Baolin Wang) Batched checking of the young flag for MGLRU. It's part cleanups; one benchmark shows large performance benefits for arm64 - "memcg: obj stock and slab stat caching cleanups" (Johannes Weiner) memcg cleanup and robustness improvements - "Allow order zero pages in page reporting" (Yuvraj Sakshith) Enhance free page reporting - it is presently and undesirably order-0 pages when reporting free memory. - "mm: vma flag tweaks" (Lorenzo Stoakes) Cleanup work following from the recent conversion of the VMA flags to a bitmap - "mm/damon: add optional debugging-purpose sanity checks" (SeongJae Park) Add some more developer-facing debug checks into DAMON core - "mm/damon: test and document power-of-2 min_region_sz requirement" (SeongJae Park) An additional DAMON kunit test and makes some adjustments to the addr_unit parameter handling - "mm/damon/core: make passed_sample_intervals comparisons overflow-safe" (SeongJae Park) Fix a hard-to-hit time overflow issue in DAMON core - "mm/damon: improve/fixup/update ratio calculation, test and documentation" (SeongJae Park) A batch of misc/minor improvements and fixups for DAMON - "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" (David Hildenbrand) Fix a possible issue with dax-device when CONFIG_HUGETLB=n. Some code movement was required. - "zram: recompression cleanups and tweaks" (Sergey Senozhatsky) A somewhat random mix of fixups, recompression cleanups and improvements in the zram code - "mm/damon: support multiple goal-based quota tuning algorithms" (SeongJae Park) Extend DAMOS quotas goal auto-tuning to support multiple tuning algorithms that users can select - "mm: thp: reduce unnecessary start_stop_khugepaged()" (Breno Leitao) Fix the khugpaged sysfs handling so we no longer spam the logs with reams of junk when starting/stopping khugepaged - "mm: improve map count checks" (Lorenzo Stoakes) Provide some cleanups and slight fixes in the mremap, mmap and vma code - "mm/damon: support addr_unit on default monitoring targets for modules" (SeongJae Park) Extend the use of DAMON core's addr_unit tunable - "mm: khugepaged cleanups and mTHP prerequisites" (Nico Pache) Cleanups to khugepaged and is a base for Nico's planned khugepaged mTHP support - "mm: memory hot(un)plug and SPARSEMEM cleanups" (David Hildenbrand) Code movement and cleanups in the memhotplug and sparsemem code - "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup CONFIG_MIGRATION" (David Hildenbrand) Rationalize some memhotplug Kconfig support - "change young flag check functions to return bool" (Baolin Wang) Cleanups to change all young flag check functions to return bool - "mm/damon/sysfs: fix memory leak and NULL dereference issues" (Josh Law and SeongJae Park) Fix a few potential DAMON bugs - "mm/vma: convert vm_flags_t to vma_flags_t in vma code" (Lorenzo Stoakes) Convert a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it. Mainly in the vma code. - "mm: expand mmap_prepare functionality and usage" (Lorenzo Stoakes) Expand the mmap_prepare functionality, which is intended to replace the deprecated f_op->mmap hook which has been the source of bugs and security issues for some time. Cleanups, documentation, extension of mmap_prepare into filesystem drivers - "mm/huge_memory: refactor zap_huge_pmd()" (Lorenzo Stoakes) Simplify and clean up zap_huge_pmd(). Additional cleanups around vm_normal_folio_pmd() and the softleaf functionality are performed. * tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (369 commits) mm: fix deferred split queue races during migration mm/khugepaged: fix issue with tracking lock mm/huge_memory: add and use has_deposited_pgtable() mm/huge_memory: add and use normal_or_softleaf_folio_pmd() mm: add softleaf_is_valid_pmd_entry(), pmd_to_softleaf_folio() mm/huge_memory: separate out the folio part of zap_huge_pmd() mm/huge_memory: use mm instead of tlb->mm mm/huge_memory: remove unnecessary sanity checks mm/huge_memory: deduplicate zap deposited table call mm/huge_memory: remove unnecessary VM_BUG_ON_PAGE() mm/huge_memory: add a common exit path to zap_huge_pmd() mm/huge_memory: handle buggy PMD entry in zap_huge_pmd() mm/huge_memory: have zap_huge_pmd return a boolean, add kdoc mm/huge: avoid big else branch in zap_huge_pmd() mm/huge_memory: simplify vma_is_specal_huge() mm: on remap assert that input range within the proposed VMA mm: add mmap_action_map_kernel_pages[_full]() uio: replace deprecated mmap hook with mmap_prepare in uio_info drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare mm: allow handling of stacked mmap_prepare hooks in more drivers ... |
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Liew Rui Yan
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6f1e182387 |
Docs/mm/damon: document min_nr_regions constraint and rationale
The current DAMON implementation requires 'min_nr_regions' to be at least 3. However, this constraint is not explicitly documented in the admin-guide documents, nor is its design rationale explained in the design document. Add a section in design.rst to explain the rationale: the virtual address space monitoring design needs to handle at least three regions to accommodate two large unmapped areas. While this is specific to 'vaddr', DAMON currently enforces it across all operation sets for consistency. Also update reclaim.rst and lru_sort.rst by adding cross-references to this constraint within their respective 'min_nr_regions' parameter description sections, ensuring users are aware of the lower bound. This change is motivated from a recent discussion [1]. Link: https://lkml.kernel.org/r/20260320052428.213230-1-aethernet65535@gmail.com Link: https://lore.kernel.org/damon/20260319151528.86490-1-sj@kernel.org/T/#t [1] Signed-off-by: Liew Rui Yan <aethernet65535@gmail.com> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Asier Gutierrez
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01494f713e |
Docs/mm/damon/design: document DAMON actions when TRANSPARENT_HUGEPAGE is off
MADV_HUGEPAGE and MADV_NOHUGEPAGE are guarded and they are not available when compiling the kernel without TRANSPARENT_HUGEPAGE option. The DAMON behaviour is to silently fail [1] in when DAMOS_HUGEPAGE or DAMOS_NOHUGEPAGE are used, but TRANSPARENT_HUGEPAGE is disabled. Update the DAMON documentation to reflect this behaviour. Link: https://lkml.kernel.org/r/20260318035349.88715-1-sj@kernel.org Link: https://lore.kernel.org/66131775-180b-4b9f-b7ce-61a3e077b6e6@huawei-partners.com/ [1] Signed-off-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Liew Rui Yan
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4bdbddb4e4 |
Docs/mm/damon: document exclusivity of special-purpose modules
Add a section in design.rst to explain that DAMON special-purpose kernel modules (LRU_SORT, RECLAIM, STAT) run in an exclusive manner and return -EBUSY if another is already running. Update lru_sort.rst, reclaim.rst and stat.rst by adding cross-references to this exclusivity rule at the end of their respective Example sections. This change is motivated from another discussion [1]. Link: https://lkml.kernel.org/r/20260315162945.80994-1-sj@kernel.org Link: https://lore.kernel.org/damon/20260314002119.79742-1-sj@kernel.org/T/#t [1] Signed-off-by: Liew Rui Yan <aethernet65535@gmail.com> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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5a242f9daf |
Docs/mm/damon/design: document the goal-based quota tuner selections
Update the design document for the newly added goal-based quota tuner selection feature. Link: https://lkml.kernel.org/r/20260310010529.91162-6-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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a4e82de81f |
Docs/mm/damon/index: fix typo: autoamted -> automated
There is an obvious typo. Fix it (s/autoamted/automated/).
Link: https://lkml.kernel.org/r/20260307195356.203753-8-sj@kernel.org
Fixes:
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SeongJae Park
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20675fc8c0 |
Docs/mm/damon/maintainer-profile: use flexible review cadence
The document mentions the maitainer is working in the usual 9-5 fashion. The maintainer nowadays prefers working in a more flexible way. Update the document to avoid contributors having a wrong time expectation. Link: https://lkml.kernel.org/r/20260307195356.203753-7-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Acked-by: wang lian <lianux.mm@gmail.com> Cc: Brendan Higgins <brendan.higgins@linux.dev> Cc: David Gow <davidgow@google.com> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
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bfb1523cde |
Docs/mm/damon/design: document the power-of-two limitation for addr_unit
The min_region_sz is set as max(DAMON_MIN_REGION_SZ / addr_unit, 1).
DAMON_MIN_REGION_SZ is the same to PAGE_SIZE, and addr_unit is what the
user can arbitrarily set. Commit
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Jane Chu
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7a197d346a |
Documentation: fix a hugetlbfs reservation statement
Documentation/mm/hugetlbfs_reserv.rst has
if (resv_needed <= (resv_huge_pages - free_huge_pages))
resv_huge_pages += resv_needed;
which describes this code in gather_surplus_pages()
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
if (needed <= 0) {
h->resv_huge_pages += delta;
return 0;
}
which means if there are enough free hugepages to account for the new
reservation, simply update the global reservation count without
further action.
But the description is backwards, it should be
if (resv_needed <= (free_huge_pages - resv_huge_pages))
instead.
Link: https://lkml.kernel.org/r/20260302201015.1824798-1-jane.chu@oracle.com
Fixes:
|
||
|
Kiryl Shutsemau
|
fed8676ca2 |
hugetlb: update vmemmap_dedup.rst
Update the documentation regarding vmemmap optimization for hugetlb to reflect the changes in how the kernel maps the tail pages. Fake heads no longer exist. Remove their description. [kas@kernel.org: update vmemmap_dedup.rst] Link: https://lkml.kernel.org/r/20260302105630.303492-1-kas@kernel.org Link: https://lkml.kernel.org/r/20260227194302.274384-18-kas@kernel.org Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Reviewed-by: Muchun Song <muchun.song@linux.dev> Reviewed-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Baoquan He <bhe@redhat.com> Cc: Christoph Lameter <cl@gentwo.org> Cc: David Rientjes <rientjes@google.com> Cc: Frank van der Linden <fvdl@google.com> Cc: Harry Yoo <harry.yoo@oracle.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Usama Arif <usamaarif642@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Kiryl Shutsemau
|
d50569612c |
mm: rename the 'compound_head' field in the 'struct page' to 'compound_info'
The 'compound_head' field in the 'struct page' encodes whether the page is a tail and where to locate the head page. Bit 0 is set if the page is a tail, and the remaining bits in the field point to the head page. As preparation for changing how the field encodes information about the head page, rename the field to 'compound_info'. Link: https://lkml.kernel.org/r/20260227194302.274384-4-kas@kernel.org Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Reviewed-by: Muchun Song <muchun.song@linux.dev> Reviewed-by: Zi Yan <ziy@nvidia.com> Acked-by: David Hildenbrand (arm) <david@kernel.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Baoquan He <bhe@redhat.com> Cc: Christoph Lameter <cl@gentwo.org> Cc: David Rientjes <rientjes@google.com> Cc: Frank van der Linden <fvdl@google.com> Cc: Harry Yoo <harry.yoo@oracle.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Usama Arif <usamaarif642@gmail.com> Cc: WANG Xuerui <kernel@xen0n.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Ariful Islam Shoikot
|
5e6df46dff |
Documentation/mm/hwpoison.rst: fix typos and grammar.
Signed-off-by: Ariful Islam Shoikot <islamarifulshoikat@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260317120614.51046-1-islamarifulshoikat@gmail.com> |
||
|
Ariful Islam Shoikot
|
73f29b02e7 |
Documentation/mm: Fix typo in NUMA paragraph
Fixed a typo in Documentation/mm/numa.rst: -changed 'allocated' to 'allocate' in the paragraph about memoryless nodes. Signed-off-by: Ariful Islam Shoikot <islamarifulshoikat@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260307114006.33183-1-islamarifulshoikat@gmail.com> |
||
|
Linus Torvalds
|
26a4cfaff8 |
A handful of small, late-arriving documentation fixes.
-----BEGIN PGP SIGNATURE----- iQFDBAABCgAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAmmR/3oPHGNvcmJldEBs d24ubmV0AAoJEBdDWhNsDH5Yf9gH/0SJoaO0Bdgh4SoWtE3AMr6Gxnig5dggoto4 C0lXix/2JcObZvBfmFkE0siCnQidb9XICCtIKlpvW35SgiQ9GsXuMT8oleo7wJii eYHdA97gOMXverRfWVg/hb87nmx901/bleJTZsuOrzh96HJGvkXARR85X0fEJo4K zfNrhnRUqUv2Onu0b1awmUYg01Yjq/VY3LzY6wRDWHE1Nfz4L0uC9XZs7FTO0UHe Q3eivfRgEMtPM64BYFweTR5vk/harx/fcbqMhapvLPaH/K726Uw6SxrXCOMq9dQL vVWy0G+yrMllu+1lIJoXnWxPEluYpuBxW/Zshx6WQa+bzA2Q1wA= =uUQO -----END PGP SIGNATURE----- Merge tag 'docs-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux Pull documentation fixes from Jonathan Corbet: "A handful of small, late-arriving documentation fixes" * tag 'docs-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: docs: toshiba_haps: fix grammar error in SSD warning Docs/mm: fix typos and grammar in page_tables.rst Docs/core-api: fix typos in rbtree.rst docs: clarify wording in programming-language.rst docs: process: maintainer-pgp-guide: update kernel.org docs link docs: kdoc_parser: allow __exit in function prototypes |
||
|
Min-Hsun Chang
|
fe58576e6a |
Docs/mm: fix typos and grammar in page_tables.rst
Correct several spelling and grammatical errors in the page tables documentation. This includes: - Fixing "a address" to "an address" - Fixing "pfs" to "pfns" - Correcting the possessive "Torvald's" to "Torvalds's" - Fixing "instruction that want" to "instruction that wants" - Fixing "code path" to "code paths" Signed-off-by: Min-Hsun Chang <chmh0624@gmail.com> Reviewed-by: Linus Walleij <linusw@kernel.org> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260209145603.96664-1-chmh0624@gmail.com> |
||
|
Linus Torvalds
|
136114e0ab |
mm.git review status for linus..mm-nonmm-stable
Total patches: 107 Reviews/patch: 1.07 Reviewed rate: 67% - The 2 patch series "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" from Heming Zhao saves disk space by teaching ocfs2 to reclaim suballocator block group space. - The 4 patch series "Add ARRAY_END(), and use it to fix off-by-one bugs" from Alejandro Colomar adds the ARRAY_END() macro and uses it in various places. - The 2 patch series "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" from Pnina Feder makes the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the page size. - The 7 patch series "kallsyms: Prevent invalid access when showing module buildid" from Petr Mladek cleans up kallsyms code related to module buildid and fixes an invalid access crash when printing backtraces. - The 3 patch series "Address page fault in ima_restore_measurement_list()" from Harshit Mogalapalli fixes a kexec-related crash that can occur when booting the second-stage kernel on x86. - The 6 patch series "kho: ABI headers and Documentation updates" from Mike Rapoport updates the kexec handover ABI documentation. - The 4 patch series "Align atomic storage" from Finn Thain adds the __aligned attribute to atomic_t and atomic64_t definitions to get natural alignment of both types on csky, m68k, microblaze, nios2, openrisc and sh. - The 2 patch series "kho: clean up page initialization logic" from Pratyush Yadav simplifies the page initialization logic in kho_restore_page(). - The 6 patch series "Unload linux/kernel.h" from Yury Norov moves several things out of kernel.h and into more appropriate places. - The 7 patch series "don't abuse task_struct.group_leader" from Oleg Nesterov removes the usage of ->group_leader when it is "obviously unnecessary". - The 5 patch series "list private v2 & luo flb" from Pasha Tatashin adds some infrastructure improvements to the live update orchestrator. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCaY4giAAKCRDdBJ7gKXxA jgusAQDnKkP8UWTqXPC1jI+OrDJGU5ciAx8lzLeBVqMKzoYk9AD/TlhT2Nlx+Ef6 0HCUHUD0FMvAw/7/Dfc6ZKxwBEIxyww= =mmsH -----END PGP SIGNATURE----- Merge tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull non-MM updates from Andrew Morton: - "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" saves disk space by teaching ocfs2 to reclaim suballocator block group space (Heming Zhao) - "Add ARRAY_END(), and use it to fix off-by-one bugs" adds the ARRAY_END() macro and uses it in various places (Alejandro Colomar) - "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" makes the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the page size (Pnina Feder) - "kallsyms: Prevent invalid access when showing module buildid" cleans up kallsyms code related to module buildid and fixes an invalid access crash when printing backtraces (Petr Mladek) - "Address page fault in ima_restore_measurement_list()" fixes a kexec-related crash that can occur when booting the second-stage kernel on x86 (Harshit Mogalapalli) - "kho: ABI headers and Documentation updates" updates the kexec handover ABI documentation (Mike Rapoport) - "Align atomic storage" adds the __aligned attribute to atomic_t and atomic64_t definitions to get natural alignment of both types on csky, m68k, microblaze, nios2, openrisc and sh (Finn Thain) - "kho: clean up page initialization logic" simplifies the page initialization logic in kho_restore_page() (Pratyush Yadav) - "Unload linux/kernel.h" moves several things out of kernel.h and into more appropriate places (Yury Norov) - "don't abuse task_struct.group_leader" removes the usage of ->group_leader when it is "obviously unnecessary" (Oleg Nesterov) - "list private v2 & luo flb" adds some infrastructure improvements to the live update orchestrator (Pasha Tatashin) * tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (107 commits) watchdog/hardlockup: simplify perf event probe and remove per-cpu dependency procfs: fix missing RCU protection when reading real_parent in do_task_stat() watchdog/softlockup: fix sample ring index wrap in need_counting_irqs() kcsan, compiler_types: avoid duplicate type issues in BPF Type Format kho: fix doc for kho_restore_pages() tests/liveupdate: add in-kernel liveupdate test liveupdate: luo_flb: introduce File-Lifecycle-Bound global state liveupdate: luo_file: Use private list list: add kunit test for private list primitives list: add primitives for private list manipulations delayacct: fix uapi timespec64 definition panic: add panic_force_cpu= parameter to redirect panic to a specific CPU netclassid: use thread_group_leader(p) in update_classid_task() RDMA/umem: don't abuse current->group_leader drm/pan*: don't abuse current->group_leader drm/amd: kill the outdated "Only the pthreads threading model is supported" checks drm/amdgpu: don't abuse current->group_leader android/binder: use same_thread_group(proc->tsk, current) in binder_mmap() android/binder: don't abuse current->group_leader kho: skip memoryless NUMA nodes when reserving scratch areas ... |
||
|
Linus Torvalds
|
4cff5c05e0 |
mm.git review status for linus..mm-stable
Everything:
Total patches: 325
Reviews/patch: 1.39
Reviewed rate: 72%
Excluding DAMON:
Total patches: 262
Reviews/patch: 1.63
Reviewed rate: 82%
Excluding DAMON and zram:
Total patches: 248
Reviews/patch: 1.72
Reviewed rate: 86%
- The 14 patch series "powerpc/64s: do not re-activate batched TLB
flush" from Alexander Gordeev makes arch_{enter|leave}_lazy_mmu_mode()
nest properly.
It adds a generic enter/leave layer and switches architectures to use
it. Various hacks were removed in the process.
- The 7 patch series "zram: introduce compressed data writeback" from
Richard Chang and Sergey Senozhatsky implements data compression for
zram writeback.
- The 8 patch series "mm: folio_zero_user: clear page ranges" from David
Hildenbrand adds clearing of contiguous page ranges for hugepages.
Large improvements during demand faulting are demonstrated.
- The 2 patch series "memcg cleanups" from Chen Ridong tideis up some
memcg code.
- The 12 patch series "mm/damon: introduce {,max_}nr_snapshots and
tracepoint for damos stats" from SeongJae Park improves DAMOS stat's
provided information, deterministic control, and readability.
- The 3 patch series "selftests/mm: hugetlb cgroup charging: robustness
fixes" from Li Wang fixes a few issues in the hugetlb cgroup charging
selftests.
- The 5 patch series "Fix va_high_addr_switch.sh test failure - again"
from Chunyu Hu addresses several issues in the va_high_addr_switch test.
- The 5 patch series "mm/damon/tests/core-kunit: extend existing test
scenarios" from Shu Anzai improves the KUnit test coverage for DAMON.
- The 2 patch series "mm/khugepaged: fix dirty page handling for
MADV_COLLAPSE" from Shivank Garg fixes a glitch in khugepaged which was
causing madvise(MADV_COLLAPSE) to transiently return -EAGAIN.
- The 29 patch series "arch, mm: consolidate hugetlb early reservation"
from Mike Rapoport reworks and consolidates a pile of straggly code
related to reservation of hugetlb memory from bootmem and creation of
CMA areas for hugetlb.
- The 9 patch series "mm: clean up anon_vma implementation" from Lorenzo
Stoakes cleans up the anon_vma implementation in various ways.
- The 3 patch series "tweaks for __alloc_pages_slowpath()" from
Vlastimil Babka does a little streamlining of the page allocator's
slowpath code.
- The 8 patch series "memcg: separate private and public ID namespaces"
from Shakeel Butt cleans up the memcg ID code and prevents the
internal-only private IDs from being exposed to userspace.
- The 6 patch series "mm: hugetlb: allocate frozen gigantic folio" from
Kefeng Wang cleans up the allocation of frozen folios and avoids some
atomic refcount operations.
- The 11 patch series "mm/damon: advance DAMOS-based LRU sorting" from
SeongJae Park 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.
- The 18 patch series "Support page table check on PowerPC" from Andrew
Donnellan makes CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc.
- The 3 patch series "nodemask: align nodes_and{,not} with underlying
bitmap ops" from Yury Norov makes nodes_and() and nodes_andnot()
propagate the return values from the underlying bit operations, enabling
some cleanup in calling code.
- The 5 patch series "mm/damon: hide kdamond and kdamond_lock from API
callers" from SeongJae Park cleans up some DAMON internal interfaces.
- The 4 patch series "mm/khugepaged: cleanups and scan limit fix" from
Shivank Garg does some cleanup work in khupaged and fixes a scan limit
accounting issue.
- The 24 patch series "mm: balloon infrastructure cleanups" from David
Hildenbrand goes to town on the balloon infrastructure and its page
migration function. Mainly cleanups, also some locking simplification.
- The 2 patch series "mm/vmscan: add tracepoint and reason for
kswapd_failures reset" from Jiayuan Chen adds additional tracepoints to
the page reclaim code.
- The 3 patch series "Replace wq users and add WQ_PERCPU to
alloc_workqueue() users" from Marco Crivellari is part of Marco's
kernel-wide migration from the legacy workqueue APIs over to the
preferred unbound workqueues.
- The 9 patch series "Various mm kselftests improvements/fixes" from
Kevin Brodsky provides various unrelated improvements/fixes for the mm
kselftests.
- The 5 patch series "mm: accelerate gigantic folio allocation" from
Kefeng Wang greatly speeds up gigantic folio allocation, mainly by
avoiding unnecessary work in pfn_range_valid_contig().
- The 5 patch series "selftests/damon: improve leak detection and wss
estimation reliability" from SeongJae Park improves the reliability of
two of the DAMON selftests.
- The 8 patch series "mm/damon: cleanup kdamond, damon_call(), damos
filter and DAMON_MIN_REGION" from SeongJae Park does some cleanup work
in the core DAMON code.
- The 8 patch series "Docs/mm/damon: update intro, modules, maintainer
profile, and misc" from SeongJae Park performs maintenance work on the
DAMON documentation.
- The 10 patch series "mm: add and use vma_assert_stabilised() helper"
from Lorenzo Stoakes 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.
- The 19 patch series "mm, swap: swap table phase II: unify swapin use"
from Kairui Song 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.
- The 8 patch series "enable PT_RECLAIM on more 64-bit architectures"
from Qi Zheng makes PT_RECLAIM available on 64-bit alpha, loongarch,
mips, parisc, um, Various cleanups were performed along the way.
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Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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
...
|
||
|
Linus Torvalds
|
0923fd0419 |
Locking updates for v6.20:
Lock debugging:
- Implement compiler-driven static analysis locking context
checking, using the upcoming Clang 22 compiler's context
analysis features. (Marco Elver)
We removed Sparse context analysis support, because prior to
removal even a defconfig kernel produced 1,700+ context
tracking Sparse warnings, the overwhelming majority of which
are false positives. On an allmodconfig kernel the number of
false positive context tracking Sparse warnings grows to
over 5,200... On the plus side of the balance actual locking
bugs found by Sparse context analysis is also rather ... sparse:
I found only 3 such commits in the last 3 years. So the
rate of false positives and the maintenance overhead is
rather high and there appears to be no active policy in
place to achieve a zero-warnings baseline to move the
annotations & fixers to developers who introduce new code.
Clang context analysis is more complete and more aggressive
in trying to find bugs, at least in principle. Plus it has
a different model to enabling it: it's enabled subsystem by
subsystem, which results in zero warnings on all relevant
kernel builds (as far as our testing managed to cover it).
Which allowed us to enable it by default, similar to other
compiler warnings, with the expectation that there are no
warnings going forward. This enforces a zero-warnings baseline
on clang-22+ builds. (Which are still limited in distribution,
admittedly.)
Hopefully the Clang approach can lead to a more maintainable
zero-warnings status quo and policy, with more and more
subsystems and drivers enabling the feature. Context tracking
can be enabled for all kernel code via WARN_CONTEXT_ANALYSIS_ALL=y
(default disabled), but this will generate a lot of false positives.
( Having said that, Sparse support could still be added back,
if anyone is interested - the removal patch is still
relatively straightforward to revert at this stage. )
Rust integration updates: (Alice Ryhl, Fujita Tomonori, Boqun Feng)
- Add support for Atomic<i8/i16/bool> and replace most Rust native
AtomicBool usages with Atomic<bool>
- Clean up LockClassKey and improve its documentation
- Add missing Send and Sync trait implementation for SetOnce
- Make ARef Unpin as it is supposed to be
- Add __rust_helper to a few Rust helpers as a preparation for
helper LTO
- Inline various lock related functions to avoid additional
function calls.
WW mutexes:
- Extend ww_mutex tests and other test-ww_mutex updates (John Stultz)
Misc fixes and cleanups:
- rcu: Mark lockdep_assert_rcu_helper() __always_inline
(Arnd Bergmann)
- locking/local_lock: Include more missing headers (Peter Zijlstra)
- seqlock: fix scoped_seqlock_read kernel-doc (Randy Dunlap)
- rust: sync: Replace `kernel::c_str!` with C-Strings
(Tamir Duberstein)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"Lock debugging:
- Implement compiler-driven static analysis locking context checking,
using the upcoming Clang 22 compiler's context analysis features
(Marco Elver)
We removed Sparse context analysis support, because prior to
removal even a defconfig kernel produced 1,700+ context tracking
Sparse warnings, the overwhelming majority of which are false
positives. On an allmodconfig kernel the number of false positive
context tracking Sparse warnings grows to over 5,200... On the plus
side of the balance actual locking bugs found by Sparse context
analysis is also rather ... sparse: I found only 3 such commits in
the last 3 years. So the rate of false positives and the
maintenance overhead is rather high and there appears to be no
active policy in place to achieve a zero-warnings baseline to move
the annotations & fixers to developers who introduce new code.
Clang context analysis is more complete and more aggressive in
trying to find bugs, at least in principle. Plus it has a different
model to enabling it: it's enabled subsystem by subsystem, which
results in zero warnings on all relevant kernel builds (as far as
our testing managed to cover it). Which allowed us to enable it by
default, similar to other compiler warnings, with the expectation
that there are no warnings going forward. This enforces a
zero-warnings baseline on clang-22+ builds (Which are still limited
in distribution, admittedly)
Hopefully the Clang approach can lead to a more maintainable
zero-warnings status quo and policy, with more and more subsystems
and drivers enabling the feature. Context tracking can be enabled
for all kernel code via WARN_CONTEXT_ANALYSIS_ALL=y (default
disabled), but this will generate a lot of false positives.
( Having said that, Sparse support could still be added back,
if anyone is interested - the removal patch is still
relatively straightforward to revert at this stage. )
Rust integration updates: (Alice Ryhl, Fujita Tomonori, Boqun Feng)
- Add support for Atomic<i8/i16/bool> and replace most Rust native
AtomicBool usages with Atomic<bool>
- Clean up LockClassKey and improve its documentation
- Add missing Send and Sync trait implementation for SetOnce
- Make ARef Unpin as it is supposed to be
- Add __rust_helper to a few Rust helpers as a preparation for
helper LTO
- Inline various lock related functions to avoid additional function
calls
WW mutexes:
- Extend ww_mutex tests and other test-ww_mutex updates (John
Stultz)
Misc fixes and cleanups:
- rcu: Mark lockdep_assert_rcu_helper() __always_inline (Arnd
Bergmann)
- locking/local_lock: Include more missing headers (Peter Zijlstra)
- seqlock: fix scoped_seqlock_read kernel-doc (Randy Dunlap)
- rust: sync: Replace `kernel::c_str!` with C-Strings (Tamir
Duberstein)"
* tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (90 commits)
locking/rwlock: Fix write_trylock_irqsave() with CONFIG_INLINE_WRITE_TRYLOCK
rcu: Mark lockdep_assert_rcu_helper() __always_inline
compiler-context-analysis: Remove __assume_ctx_lock from initializers
tomoyo: Use scoped init guard
crypto: Use scoped init guard
kcov: Use scoped init guard
compiler-context-analysis: Introduce scoped init guards
cleanup: Make __DEFINE_LOCK_GUARD handle commas in initializers
seqlock: fix scoped_seqlock_read kernel-doc
tools: Update context analysis macros in compiler_types.h
rust: sync: Replace `kernel::c_str!` with C-Strings
rust: sync: Inline various lock related methods
rust: helpers: Move #define __rust_helper out of atomic.c
rust: wait: Add __rust_helper to helpers
rust: time: Add __rust_helper to helpers
rust: task: Add __rust_helper to helpers
rust: sync: Add __rust_helper to helpers
rust: refcount: Add __rust_helper to helpers
rust: rcu: Add __rust_helper to helpers
rust: processor: Add __rust_helper to helpers
...
|
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|
SeongJae Park
|
4c8f08d993 |
Docs/mm/damon/maintainer-profile: remove damon-tests/perf suggestion
The DAMON performance tests [1] use PARSEC 3.0 as its major test workloads. But the official web site for PARSEC 3.0 has gone, so there is no easy way to get the benchmark. Mainly due to the fact, DAMON performance tests are difficult to run, and effectively broken. Do not request running it for now. Instead, suggest running any benchmarks or real world workloads that make sense for performance changes. [1] https://github.com/damonitor/damon-tests/tree/master/perf Link: https://lkml.kernel.org/r/20260118180305.70023-9-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
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SeongJae Park
|
b71e496f81 |
Docs/mm/damon/maintainer-profile: fix wrong MAITNAINERS section name
Commit
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SeongJae Park
|
e7df7a0bfc |
Docs/admin-guide/mm/damon/usage: introduce DAMON modules at the beginning
DAMON usage document provides a list of available DAMON interfaces with brief introduction at the beginning of the doc. The list is missing DAMON modules for special purposes, while it is one of the major suggested interfaces. Add an item for those to the list. Link: https://lkml.kernel.org/r/20260118180305.70023-6-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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SeongJae Park
|
83cefa8d7e |
Docs/mm/damon/design: add reference to DAMON_STAT usage
Design document's special-purpose DAMON modules section is providing the list of links to the usage documents of existing DAMON modules. It is missing the link for DAMON_STAT, though. Add the missed link. Link: https://lkml.kernel.org/r/20260118180305.70023-5-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |