kernel/linux.git/tools/testing/radix-tree/maple.c, branch v6.19.11

Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-10-03T01:18:33+00:00

Pull MM updates from Andrew Morton: - "mm, swap: improve cluster scan strategy" from Kairui Song improves performance and reduces the failure rate of swap cluster allocation - "support large align and nid in Rust allocators" from Vitaly Wool permits Rust allocators to set NUMA node and large alignment when perforning slub and vmalloc reallocs - "mm/damon/vaddr: support stat-purpose DAMOS" from Yueyang Pan extend DAMOS_STAT's handling of the DAMON operations sets for virtual address spaces for ops-level DAMOS filters - "execute PROCMAP_QUERY ioctl under per-vma lock" from Suren Baghdasaryan reduces mmap_lock contention during reads of /proc/pid/maps - "mm/mincore: minor clean up for swap cache checking" from Kairui Song performs some cleanup in the swap code - "mm: vm_normal_page*() improvements" from David Hildenbrand provides code cleanup in the pagemap code - "add persistent huge zero folio support" from Pankaj Raghav provides a block layer speedup by optionalls making the huge_zero_pagepersistent, instead of releasing it when its refcount falls to zero - "kho: fixes and cleanups" from Mike Rapoport adds a few touchups to the recently added Kexec Handover feature - "mm: make mm->flags a bitmap and 64-bit on all arches" from Lorenzo Stoakes turns mm_struct.flags into a bitmap. To end the constant struggle with space shortage on 32-bit conflicting with 64-bit's needs - "mm/swapfile.c and swap.h cleanup" from Chris Li cleans up some swap code - "selftests/mm: Fix false positives and skip unsupported tests" from Donet Tom fixes a few things in our selftests code - "prctl: extend PR_SET_THP_DISABLE to only provide THPs when advised" from David Hildenbrand "allows individual processes to opt-out of THP=always into THP=madvise, without affecting other workloads on the system". It's a long story - the [1/N] changelog spells out the considerations - "Add and use memdesc_flags_t" from Matthew Wilcox gets us started on the memdesc project. Please see https://kernelnewbies.org/MatthewWilcox/Memdescs and https://blogs.oracle.com/linux/post/introducing-memdesc - "Tiny optimization for large read operations" from Chi Zhiling improves the efficiency of the pagecache read path - "Better split_huge_page_test result check" from Zi Yan improves our folio splitting selftest code - "test that rmap behaves as expected" from Wei Yang adds some rmap selftests - "remove write_cache_pages()" from Christoph Hellwig removes that function and converts its two remaining callers - "selftests/mm: uffd-stress fixes" from Dev Jain fixes some UFFD selftests issues - "introduce kernel file mapped folios" from Boris Burkov introduces the concept of "kernel file pages". Using these permits btrfs to account its metadata pages to the root cgroup, rather than to the cgroups of random inappropriate tasks - "mm/pageblock: improve readability of some pageblock handling" from Wei Yang provides some readability improvements to the page allocator code - "mm/damon: support ARM32 with LPAE" from SeongJae Park teaches DAMON to understand arm32 highmem - "tools: testing: Use existing atomic.h for vma/maple tests" from Brendan Jackman performs some code cleanups and deduplication under tools/testing/ - "maple_tree: Fix testing for 32bit compiles" from Liam Howlett fixes a couple of 32-bit issues in tools/testing/radix-tree.c - "kasan: unify kasan_enabled() and remove arch-specific implementations" from Sabyrzhan Tasbolatov moves KASAN arch-specific initialization code into a common arch-neutral implementation - "mm: remove zpool" from Johannes Weiner removes zspool - an indirection layer which now only redirects to a single thing (zsmalloc) - "mm: task_stack: Stack handling cleanups" from Pasha Tatashin makes a couple of cleanups in the fork code - "mm: remove nth_page()" from David Hildenbrand makes rather a lot of adjustments at various nth_page() callsites, eventually permitting the removal of that undesirable helper function - "introduce kasan.write_only option in hw-tags" from Yeoreum Yun creates a KASAN read-only mode for ARM, using that architecture's memory tagging feature. It is felt that a read-only mode KASAN is suitable for use in production systems rather than debug-only - "mm: hugetlb: cleanup hugetlb folio allocation" from Kefeng Wang does some tidying in the hugetlb folio allocation code - "mm: establish const-correctness for pointer parameters" from Max Kellermann makes quite a number of the MM API functions more accurate about the constness of their arguments. This was getting in the way of subsystems (in this case CEPH) when they attempt to improving their own const/non-const accuracy - "Cleanup free_pages() misuse" from Vishal Moola fixes a number of code sites which were confused over when to use free_pages() vs __free_pages() - "Add Rust abstraction for Maple Trees" from Alice Ryhl makes the mapletree code accessible to Rust. Required by nouveau and by its forthcoming successor: the new Rust Nova driver - "selftests/mm: split_huge_page_test: split_pte_mapped_thp improvements" from David Hildenbrand adds a fix and some cleanups to the thp selftesting code - "mm, swap: introduce swap table as swap cache (phase I)" from Chris Li and Kairui Song is the first step along the path to implementing "swap tables" - a new approach to swap allocation and state tracking which is expected to yield speed and space improvements. This patchset itself yields a 5-20% performance benefit in some situations - "Some ptdesc cleanups" from Matthew Wilcox utilizes the new memdesc layer to clean up the ptdesc code a little - "Fix va_high_addr_switch.sh test failure" from Chunyu Hu fixes some issues in our 5-level pagetable selftesting code - "Minor fixes for memory allocation profiling" from Suren Baghdasaryan addresses a couple of minor issues in relatively new memory allocation profiling feature - "Small cleanups" from Matthew Wilcox has a few cleanups in preparation for more memdesc work - "mm/damon: add addr_unit for DAMON_LRU_SORT and DAMON_RECLAIM" from Quanmin Yan makes some changes to DAMON in furtherance of supporting arm highmem - "selftests/mm: Add -Wunreachable-code and fix warnings" from Muhammad Anjum adds that compiler check to selftests code and fixes the fallout, by removing dead code - "Improvements to Victim Process Thawing and OOM Reaper Traversal Order" from zhongjinji makes a number of improvements in the OOM killer: mainly thawing a more appropriate group of victim threads so they can release resources - "mm/damon: misc fixups and improvements for 6.18" from SeongJae Park is a bunch of small and unrelated fixups for DAMON - "mm/damon: define and use DAMON initialization check function" from SeongJae Park implement reliability and maintainability improvements to a recently-added bug fix - "mm/damon/stat: expose auto-tuned intervals and non-idle ages" from SeongJae Park provides additional transparency to userspace clients of the DAMON_STAT information - "Expand scope of khugepaged anonymous collapse" from Dev Jain removes some constraints on khubepaged's collapsing of anon VMAs. It also increases the success rate of MADV_COLLAPSE against an anon vma - "mm: do not assume file == vma->vm_file in compat_vma_mmap_prepare()" from Lorenzo Stoakes moves us further towards removal of file_operations.mmap(). This patchset concentrates upon clearing up the treatment of stacked filesystems - "mm: Improve mlock tracking for large folios" from Kiryl Shutsemau provides some fixes and improvements to mlock's tracking of large folios. /proc/meminfo's "Mlocked" field became more accurate - "mm/ksm: Fix incorrect accounting of KSM counters during fork" from Donet Tom fixes several user-visible KSM stats inaccuracies across forks and adds selftest code to verify these counters - "mm_slot: fix the usage of mm_slot_entry" from Wei Yang addresses some potential but presently benign issues in KSM's mm_slot handling * tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (372 commits) mm: swap: check for stable address space before operating on the VMA mm: convert folio_page() back to a macro mm/khugepaged: use start_addr/addr for improved readability hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list alloc_tag: fix boot failure due to NULL pointer dereference mm: silence data-race in update_hiwater_rss mm/memory-failure: don't select MEMORY_ISOLATION mm/khugepaged: remove definition of struct khugepaged_mm_slot mm/ksm: get mm_slot by mm_slot_entry() when slot is !NULL hugetlb: increase number of reserving hugepages via cmdline selftests/mm: add fork inheritance test for ksm_merging_pages counter mm/ksm: fix incorrect KSM counter handling in mm_struct during fork drivers/base/node: fix double free in register_one_node() mm: remove PMD alignment constraint in execmem_vmalloc() mm/memory_hotplug: fix typo 'esecially' -> 'especially' mm/rmap: improve mlock tracking for large folios mm/filemap: map entire large folio faultaround mm/fault: try to map the entire file folio in finish_fault() mm/rmap: mlock large folios in try_to_unmap_one() mm/rmap: fix a mlock race condition in folio_referenced_one() ...

maple_tree: Add single node allocation support to maple state

2025-09-29T07:40:46+00:00

The fast path through a write will require replacing a single node in the tree. Using a sheaf (32 nodes) is too heavy for the fast path, so special case the node store operation by just allocating one node in the maple state. Signed-off-by: Liam R. Howlett Signed-off-by: Vlastimil Babka

maple_tree: Prefilled sheaf conversion and testing

2025-09-29T07:31:41+00:00

Use prefilled sheaves instead of bulk allocations. This should speed up the allocations and the return path of unused allocations. Remove the push and pop of nodes from the maple state as this is now handled by the slab layer with sheaves. Testing has been removed as necessary since the features of the tree have been reduced. Signed-off-by: Liam R. Howlett Reviewed-by: Suren Baghdasaryan Signed-off-by: Vlastimil Babka

tools/testing: include maple-shim.c in maple.c

2025-09-29T07:23:08+00:00

There's some duplicated code and we are about to add more functionality in maple-shared.h that we will need in the userspace maple test to be available, so include it via maple-shim.c Co-developed-by: Liam R. Howlett Signed-off-by: Liam R. Howlett Reviewed-by: Suren Baghdasaryan Signed-off-by: Vlastimil Babka

maple_tree: Drop bulk insert support

2025-09-29T07:21:16+00:00

Bulk insert mode was added to facilitate forking faster, but forking now uses __mt_dup() to duplicate the tree. The addition of sheaves has made the bulk allocations difficult to maintain - since the expected entries would preallocate into the maple state. A big part of the maple state node allocation was the ability to push nodes back onto the state for later use, which was essential to the bulk insert algorithm. Remove mas_expected_entries() and mas_destroy_rebalance() functions as well as the MA_STATE_BULK and MA_STATE_REBALANCE maple state flags since there are no users anymore. Drop the associated testing as well. Signed-off-by: Liam R. Howlett Reviewed-by: Suren Baghdasaryan Signed-off-by: Vlastimil Babka

maple_tree: testing fix for spanning store on 32b

2025-09-13T23:55:26+00:00

32 bit nodes have a larger branching factor. This affects the required value to cause a height change. Update the spanning store height test to work for both 64 and 32 bit nodes. Link: https://lkml.kernel.org/r/20250828003023.418966-3-Liam.Howlett@oracle.com Fixes: f9d3a963fef4 ("maple_tree: use height and depth consistently") Signed-off-by: Liam R. Howlett Reviewed-by: Sidhartha Kumar Signed-off-by: Andrew Morton

maple_tree: fix testing for 32 bit builds

2025-09-13T23:55:26+00:00

Patch series "maple_tree: Fix testing for 32bit compiles". The maple tree test suite supports 32bit builds which causes 32bit nodes and index/last values. Some tests have too large values and must be skipped while others depend on certain actions causing the tree to be altered in another measurable way (such as the height decreasing or increasing). Two tests were added that broke 32bit testing, either by compile warnings or failures. These fixes restore the tests to a working order. Building 32bit version can be done on a 32bit platform, or by using a command like: BUILD=32 make clean maple This patch (of 2): Some tests are invalid on 32bit due to the size of the index and last. Making those tests depend on the correct build flags stops compile complaints. Link: https://lkml.kernel.org/r/20250828003023.418966-1-Liam.Howlett@oracle.com Link: https://lkml.kernel.org/r/20250828003023.418966-2-Liam.Howlett@oracle.com Fixes: 5d659bbb52a2 ("maple_tree: introduce mas_wr_store_type()") Signed-off-by: Liam R. Howlett Reviewed-by: Sidhartha Kumar Signed-off-by: Andrew Morton

tools/testing/radix-tree: test maple tree chaining mas_preallocate() calls

2025-07-10T05:42:12+00:00

Testing calling multiple mas_preallocate() calls in a row after adjusting the maple state. Ensures new calls to mas_preallocate() will change the number of allocated nodes. Link: https://lkml.kernel.org/r/20250616184521.3382795-4-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Acked-by: Lorenzo Stoakes Cc: Hailong Liu Cc: "Liam R. Howlett" Cc: Matthew Wilcox (Oracle) Cc: Peng Zhang Cc: Sidhartha Kumar Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton

testing/radix-tree/maple: increase readers and reduce delay for faster machines

2025-07-10T05:42:12+00:00

Faster machines may not see the initial or updated value in the race condition. Reduce the delay so that faster machines are less likely to fail testing of the race conditions. Link: https://lkml.kernel.org/r/20250616184521.3382795-2-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Cc: Hailong Liu Cc: Matthew Wilcox (Oracle) Cc: Peng Zhang Cc: Sidhartha Kumar Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton

maple_tree: add sufficient height

2025-05-12T00:48:29+00:00

In order to support rebalancing and spanning stores using less than the worst case number of nodes, we need to track more than just the vacant height. Using only vacant height to reduce the worst case maple node allocation count can lead to a shortcoming of nodes in the following scenarios. For rebalancing writes, when a leaf node becomes insufficient, it may be combined with a sibling into a single node. This means that the parent node which has entries for this children will lose one entry. If this parent node was just meeting the minimum entries, losing one entry will now cause this parent node to be insufficient. This leads to a cascading operation of rebalancing at different levels and can lead to more node allocations than simply using vacant height can return. For spanning writes, a similar situation occurs. At the location at which a spanning write is detected, the number of ancestor nodes may similarly need to rebalanced into a smaller number of nodes and the same cascading situation could occur. To use less than the full height of the tree for the number of allocations, we also need to track the height at which a non-leaf node cannot become insufficient. This means even if a rebalance occurs to a child of this node, it currently has enough entries that it can lose one without any further action. This field is stored in the maple write state as sufficient height. In mas_prealloc_calc() when figuring out how many nodes to allocate, we check if the vacant node is lower in the tree than a sufficient node (has a larger value). If it is, we cannot use the vacant height and must use the difference in the height and sufficient height as the basis for the number of nodes needed. An off by one bug was also discovered in mast_overflow() where it is using >= rather than >. This caused extra iterations of the mas_spanning_rebalance() loop and lead to unneeded allocations. A test is also added to check the number of allocations is correct. Link: https://lkml.kernel.org/r/20250410191446.2474640-6-sidhartha.kumar@oracle.com Signed-off-by: Sidhartha Kumar Reviewed-by: Liam R. Howlett Cc: Matthew Wilcox (Oracle) Cc: Wei Yang Signed-off-by: Andrew Morton