memory management - userfaultfd · Maintained

Maintainers

• M Andrew Morton <akpm@linux-foundation.org>
• M Mike Rapoport <rppt@kernel.org>
• R Peter Xu <peterx@redhat.com>

Paths

• F Documentation/admin-guide/mm/userfaultfd.rst
• F include/asm-generic/pgtable_uffd.h
• F include/linux/userfaultfd_k.h
• F include/uapi/linux/userfaultfd.h
• F mm/userfaultfd.c
• F tools/testing/selftests/mm/uffd-*.[ch]

Last 30 days

Active reviewers (last 30 days)

• Mike Rapoport (Microsoft) <rppt@kernel.org>
  27 attestations (9 Acked-by, 18 Reviewed-by) · last on 2026-07-08
• SeongJae Park <sj@kernel.org>
  9 attestations (9 Reviewed-by) · last on 2026-07-08
• Lorenzo Stoakes <ljs@kernel.org>
  9 attestations (6 Reviewed-by, 3 Suggested-by) · last on 2026-07-08

Recent patches

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

• COLD21d IN LINUX-NEXT [PATCH v10 15/15] Documentation/userfaultfd: document RWP working set tracking
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 11 (11M) [PATCH v10 13/15] userfaultfd: add UFFDIO_SET_MODE for runtime sync/async toggle
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 11 (11M) [PATCH v10 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 11 (11M) [PATCH v10 10/15] mm/userfaultfd: add RWP fault delivery and expose UFFDIO_REGISTER_MODE_RWP
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 11 (11M) [PATCH v10 09/15] userfaultfd: add UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT plumbing
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 11 (11M) [PATCH v10 07/15] mm: preserve RWP marker across PTE rewrites
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 12 (12M) [PATCH v10 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 22 (22M) [PATCH v10 05/15] mm: add VM_UFFD_RWP VMA flag
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 21 (21M) [PATCH v10 04/15] userfaultfd: test uffd VMA flags through the vma_flags_t API
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD21d IN LINUX-NEXT: 12 (12M) [PATCH v10 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD24d [PATCH v9 15/15] Documentation/userfaultfd: document RWP working set tracking
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 11 (11M) [PATCH v9 13/15] userfaultfd: add UFFDIO_SET_MODE for runtime sync/async toggle
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 11 (11M) [PATCH v9 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d 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>
• COLD24d REVIEWED: 11 (11M) [PATCH v9 09/15] userfaultfd: add UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT plumbing
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 11 (11M) [PATCH v9 07/15] mm: preserve RWP marker across PTE rewrites
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 12 (12M) [PATCH v9 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 21 (21M) [PATCH v9 04/15] userfaultfd: test uffd VMA flags through the vma_flags_t API
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 22 (22M) [PATCH v9 05/15] mm: add VM_UFFD_RWP VMA flag
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD24d REVIEWED: 12 (12M) [PATCH v9 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-06 · Kiryl Shutsemau <hidden>
• DORMANTno replies Addressing Sashiko AI review
  2026-07-03 · Kiryl Shutsemau <kas@kernel.org>
• COLD27d [PATCH v8 15/15] Documentation/userfaultfd: document RWP working set tracking
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 11 (11M) [PATCH v8 13/15] userfaultfd: add UFFDIO_SET_MODE for runtime sync/async toggle
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 11 (11M) [PATCH v8 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d 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>
• COLD27d REVIEWED: 11 (11M) [PATCH v8 09/15] userfaultfd: add UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT plumbing
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 11 (11M) [PATCH v8 07/15] mm: preserve RWP marker across PTE rewrites
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 12 (12M) [PATCH v8 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 22 (22M) [PATCH v8 05/15] mm: add VM_UFFD_RWP VMA flag
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD27d REVIEWED: 21 (21M) [PATCH v8 04/15] userfaultfd: test uffd VMA flags through the vma_flags_t API
  2026-07-03 · Kiryl Shutsemau <hidden>

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.

• STALE133d [PATCH v4 03/21] mm: swap: add an abstract API for locking out swapoff
  2026-03-18 · Nhat Pham <nphamcs@gmail.com>
• STALE133d [PATCH v4 05/21] mm/swap: add a new function to check if a swap entry is in swap cached.
  2026-03-18 · Nhat Pham <nphamcs@gmail.com>
• STALE90d [PATCH v5 03/21] mm: swap: add an abstract API for locking out swapoff
  2026-03-20 · Nhat Pham <nphamcs@gmail.com>
• STALE90d [PATCH v5 05/21] mm/swap: add a new function to check if a swap entry is in swap cached.
  2026-03-20 · Nhat Pham <nphamcs@gmail.com>
• STALE94d [RFC, PATCH 01/12] userfaultfd: define UAPI constants for anonymous minor faults
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE94d [RFC, PATCH 02/12] userfaultfd: add UFFD_FEATURE_MINOR_ANON registration support
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE94d [RFC, PATCH 03/12] userfaultfd: implement UFFDIO_DEACTIVATE ioctl
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE94d [RFC, PATCH 04/12] userfaultfd: UFFDIO_CONTINUE for anonymous memory
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE94d [RFC, PATCH 08/12] userfaultfd: enable UFFD_FEATURE_MINOR_ANON
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>
• STALE94d [RFC, PATCH 12/12] Documentation/userfaultfd: document working set tracking
  2026-04-14 · "Kiryl Shutsemau (Meta)" <kas@kernel.org>