hugetlb subsystem · Maintained

Maintainers

• M Muchun Song <muchun.song@linux.dev>
• M Oscar Salvador <osalvador@suse.de>
• R David Hildenbrand <david@kernel.org>

Paths

• F Documentation/ABI/testing/sysfs-kernel-mm-hugepages
• F Documentation/admin-guide/mm/hugetlbpage.rst
• F Documentation/mm/hugetlbfs_reserv.rst
• F Documentation/mm/vmemmap_dedup.rst
• F fs/hugetlbfs/
• F include/linux/hugetlb.h
• F include/trace/events/hugetlbfs.h
• F mm/hugetlb.c
• F mm/hugetlb_cgroup.c
• F mm/hugetlb_cma.c
• F mm/hugetlb_cma.h
• F mm/hugetlb_sysctl.c
• F mm/hugetlb_sysfs.c
• F mm/hugetlb_vmemmap.c
• F mm/hugetlb_vmemmap.h
• F tools/testing/selftests/cgroup/test_hugetlb_memcg.c

Last 30 days

Most active threads (last 7 days)

• HOTtoday [RFC PATCH 0/6] mm/hugetlb: Dynamic, NUMA-aware HugePage Cache & Free Page Reporting
  2026-07-07 06:42 · 6 replies in 7d · Sourav Panda <hidden>
• WARM1d [PATCH v9 00/15] userfaultfd: working set tracking for VM guest memory
  2026-07-06 08:48 · 5 replies in 7d · Kiryl Shutsemau <hidden>
• COOLING4d [PATCH v8 00/15] userfaultfd: working set tracking for VM guest memory
  2026-07-03 13:36 · 5 replies in 7d · Kiryl Shutsemau <hidden>

Active reviewers (last 30 days)

• Mike Rapoport (Microsoft) <rppt@kernel.org>
  15 attestations (6 Acked-by, 9 Reviewed-by) · last on 2026-07-06
• SeongJae Park <sj@kernel.org>
  6 attestations (6 Reviewed-by) · last on 2026-07-06
• Matthew Wilcox <willy@infradead.org>
  3 attestations (3 Suggested-by) · last on 2026-06-17
• David Hildenbrand <david@kernel.org>
  1 attestation (1 Suggested-by) · last on 2026-06-17

Recent patches

Most-recent 30 patches in this subsystem on linux-doc (capped at 30), ordered by date desc.

• HOTtoday [PATCH 5/6] Documentation/admin-guide/mm/hugetlbpage.rst: document cache interfaces
  2026-07-07 · Sourav Panda <hidden>
• HOTtoday [PATCH 6/6] mm/hugetlb: support free page reporting for cached hugepages
  2026-07-07 · Sourav Panda <hidden>
• HOTtoday [PATCH 4/6] mm/hugetlb: add memory shrinker for cache
  2026-07-07 · Sourav Panda <hidden>
• HOTtoday [PATCH 2/6] mm/hugetlb: implement cache recycling and allocation
  2026-07-07 · Sourav Panda <hidden>
• HOTtoday [PATCH 3/6] mm/hugetlb: add sysfs interfaces for cache
  2026-07-07 · Sourav Panda <hidden>
• HOTtoday [PATCH 1/6] mm/hugetlb: add Kconfig and basic cache infrastructure
  2026-07-07 · Sourav Panda <hidden>
• WARM1d REVIEWED: 11 (11M) [PATCH v9 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-07-06 · Kiryl Shutsemau <hidden>
• WARM1d REVIEWED: 11 (11M) [PATCH v9 10/15] mm/userfaultfd: add RWP fault delivery and expose UFFDIO_REGISTER_MODE_RWP
  2026-07-06 · Kiryl Shutsemau <hidden>
• WARM1d REVIEWED: 11 (11M) [PATCH v9 07/15] mm: preserve RWP marker across PTE rewrites
  2026-07-06 · Kiryl Shutsemau <hidden>
• WARM1d REVIEWED: 12 (12M) [PATCH v9 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-07-06 · Kiryl Shutsemau <hidden>
• WARM1d REVIEWED: 12 (12M) [PATCH v9 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-06 · Kiryl Shutsemau <hidden>
• COOLING4d REVIEWED: 11 (11M) [PATCH v8 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING4d REVIEWED: 11 (11M) [PATCH v8 10/15] mm/userfaultfd: add RWP fault delivery and expose UFFDIO_REGISTER_MODE_RWP
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING4d REVIEWED: 11 (11M) [PATCH v8 07/15] mm: preserve RWP marker across PTE rewrites
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING4d REVIEWED: 12 (12M) [PATCH v8 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING4d REVIEWED: 12 (12M) [PATCH v8 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING8d REVIEWED: 11 (11M) [PATCH v7 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-06-29 · Kiryl Shutsemau <hidden>
• COOLING8d REVIEWED: 11 (11M) [PATCH v7 10/15] mm/userfaultfd: add RWP fault delivery and expose UFFDIO_REGISTER_MODE_RWP
  2026-06-29 · Kiryl Shutsemau <hidden>
• COOLING8d REVIEWED: 11 (11M) [PATCH v7 07/15] mm: preserve RWP marker across PTE rewrites
  2026-06-29 · Kiryl Shutsemau <hidden>
• COOLING8d REVIEWED: 12 (12M) [PATCH v7 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-06-29 · Kiryl Shutsemau <hidden>
• COOLING8d REVIEWED: 12 (12M) [PATCH v7 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-06-29 · Kiryl Shutsemau <hidden>
• COOLING14d [PATCH v2 10/11] hugetlb: drop vma_hugecache_offset() in favor of linear_page_index()
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 11/11] hugetlb: make hugetlb_[un]reserve_pages() to take PAGE granularity index
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 09/11] hugetlb: remove the hugetlb_linear_page_index() helper
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 08/11] hugetlb: make hugetlb_add_to_page_cache() to take PAGE_SIZE granularity index
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 07/11] hugetlb: replace filemap_lock_hugetlb_folio with filemap_lock_folio
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 06/11] hugetlb: make hugetlb_fault_mutex_hash() to take PAGE_SIZE index
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 05/11] hugetlb: Convert the vmf->pgoff to PAGE_SIZE granularity
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 04/11] hugetlbfs,filemap: replace hugetlbfs_read_iter() with generic_file_read_iter()
  2026-06-17 · Jane Chu <hidden>
• COOLING14d [PATCH v2 01/11] mm/memory-failure: make is_raw_hwpoison_page_in_hugepage() general purpose
  2026-06-17 · Jane Chu <hidden>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• STALE169d REVIEWED: 3 (3M) [PATCHv3 03/15] mm: Change the interface of prep_compound_tail()
  2026-01-15 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE169d REVIEWED: 3 (3M) [PATCHv3 04/15] mm: Rename the 'compound_head' field in the 'struct page' to 'compound_info'
  2026-01-15 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE169d REVIEWED: 3 (3M) [PATCHv3 12/15] hugetlb: Remove VMEMMAP_SYNCHRONIZE_RCU
  2026-01-15 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE169d REVIEWED: 3 (3M) [PATCHv3 13/15] mm/hugetlb: Remove hugetlb_optimize_vmemmap_key static key
  2026-01-15 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE160d REVIEWED: 3 (3M) [PATCHv4 02/14] mm: Change the interface of prep_compound_tail()
  2026-01-21 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE160d REVIEWED: 3 (3M) [PATCHv4 03/14] mm: Rename the 'compound_head' field in the 'struct page' to 'compound_info'
  2026-01-21 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE160d REVIEWED: 3 (3M) [PATCHv4 11/14] hugetlb: Remove VMEMMAP_SYNCHRONIZE_RCU
  2026-01-21 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE160d REVIEWED: 3 (3M) [PATCHv4 12/14] mm/hugetlb: Remove hugetlb_optimize_vmemmap_key static key
  2026-01-21 · Kiryl Shutsemau <kas@kernel.org> · 1 Reviewed-by
• STALE159d REVIEWED: 6 (6M) [PATCHv5 02/17] mm: Change the interface of prep_compound_tail()
  2026-01-28 · Kiryl Shutsemau <kas@kernel.org> · 2 Reviewed-by
• STALE159d REVIEWED: 6 (6M) [PATCHv5 03/17] mm: Rename the 'compound_head' field in the 'struct page' to 'compound_info'
  2026-01-28 · Kiryl Shutsemau <kas@kernel.org> · 2 Reviewed-by

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE186d [PATCH 26/28] mm, arch: consolidate hugetlb CMA reservation
  2025-12-28 · Mike Rapoport <rppt@kernel.org>
• STALE138d [PATCH v2 26/28] mm, arch: consolidate hugetlb CMA reservation
  2026-01-02 · Mike Rapoport <rppt@kernel.org>
• STALE120d [PATCH v3 27/29] mm, arch: consolidate hugetlb CMA reservation
  2026-01-11 · Mike Rapoport <rppt@kernel.org>
• STALE169d [PATCHv3 15/15] hugetlb: Update vmemmap_dedup.rst
  2026-01-15 · Kiryl Shutsemau <kas@kernel.org>
• STALE169d [PATCHv3.1 10/15] mm/hugetlb: Remove fake head pages
  2026-01-16 · Kiryl Shutsemau <kas@kernel.org>
• DORMANTno replies [PATCH] Documentation: fix a hugetlbfs reservation statement
  2026-03-02 · Jane Chu <hidden>
• STALE71d [RFC, PATCH 06/12] userfaultfd: auto-resolve shmem and hugetlbfs minor faults in async mode
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE64d [PATCH 05/14] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-04-27 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE64d [PATCH 06/14] mm: preserve RWP marker across PTE rewrites
  2026-04-27 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>