slab allocator · Maintained

Maintainers

• M Vlastimil Babka <vbabka@kernel.org>
• M Harry Yoo <harry@kernel.org>
• M Andrew Morton <akpm@linux-foundation.org>
• R Hao Li <hao.li@linux.dev>
• R Christoph Lameter <cl@gentwo.org>
• R David Rientjes <rientjes@google.com>
• R Roman Gushchin <roman.gushchin@linux.dev>

Paths

• F Documentation/admin-guide/mm/slab.rst
• F Documentation/mm/slab.rst
• F include/linux/mempool.h
• F include/linux/slab.h
• F lib/tests/slub_kunit.c
• F mm/failslab.c
• F mm/mempool.c
• F mm/slab.h
• F mm/slab_common.c
• F mm/slub.c
• F scripts/gdb/linux/slab.py
• F tools/cgroup/memcg_slabinfo.py
• F tools/include/linux/slab.h
• F tools/lib/slab.c
• F tools/mm/slabinfo-gnuplot.sh
• F tools/mm/slabinfo.c

Last 30 days

Most active threads (last 7 days)

• HOTtoday [PATCH v3 00/13] mm/slab, alloc_tag: reduce obj_ext memory waste
  2026-07-27 14:07 · 14 replies in 7d · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>

Active reviewers (last 30 days)

• Suren Baghdasaryan <surenb@google.com>
  19 attestations (19 Reviewed-by) · last on 2026-07-27
• Hao Li <hao.li@linux.dev>
  8 attestations (8 Reviewed-by) · last on 2026-07-27
• Harry Yoo <harry@kernel.org>
  4 attestations (3 Reviewed-by, 1 Suggested-by) · last on 2026-07-27

Recent patches

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

• DORMANTno replies REVIEWED: 7 (7M) Re: [PATCH v3 10/13] mm/slab: reduce slabobj_ext memory with allocation profiling disabled
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v3 13/13] mm/slab, kfence, memcg: completely remove obj_ext for kfence objects
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 1 (1M) [PATCH v3 12/13] mm/slab: stop allocating objcg pointers when unnecessary
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 1 (1M) [PATCH v3 11/13] mm/slab: add cache_ and slab_needs_objcg() helpers
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v3 10/13] mm/slab: reduce slabobj_ext memory with allocation profiling disabled
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v3 09/13] mm/slab: introduce slab_obj_ext_has_codetag()
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v3 08/13] mm/slab: change struct slabobj_ext to a union
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 8 (8M) [PATCH v3 07/13] mm/slab: replace slab.stride with obj_exts_in_object
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 8 (8M) [PATCH v3 06/13] mm/slab: abstract slabobj_ext.ref access
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 8 (8M) [PATCH v3 05/13] mm/slab: abstract slabobj_ext.objcg access
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 10 (10M) [PATCH v3 04/13] mm/slab: make slab_obj_ext() determine object index
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 10 (10M) [PATCH v3 03/13] mm: move struct slabobj_ext to mm/slab.h
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 17 (17M) [PATCH v3 02/13] mm/slab: remove objs_per_slab()
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v3 01/13] mm/slab: skip kfence objects in allocation profiling
  2026-07-27 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v2 13/13] mm/slab: stop allocating objcg pointers when unnecessary
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v2 12/13] mm/slab: add cache_ and slab_needs_objcg() helpers
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 11/13] mm/slab: reduce slabobj_ext memory with allocation profiling disabled
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 10/13] mm/slab: introduce slab_obj_ext_has_codetag()
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 09/13] mm/slab: change struct slabobj_ext to a union
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 08/13] mm/slab: replace slab.stride with obj_exts_in_object
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 07/13] mm/slab: abstract slabobj_ext.ref access
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v2 06/13] mm/slab: abstract slabobj_ext.objcg access
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 05/13] mm/slab: make slab_obj_ext() determine object index
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 04/13] mm: move struct slabobj_ext to mm/slab.h
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday REVIEWED: 7 (7M) [PATCH v2 03/13] mm/slab: remove objs_per_slab()
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v2 02/13] mm/slub: skip handle_failed_objexts_alloc() with profiling disabled
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• HOTtoday [PATCH v2 01/13] mm/slab: skip kfence objects in allocation profiling
  2026-07-20 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• COOLING7d [PATCH RFC 12/12] mm/slab: stop allocating objcg pointers when unnecessary
  2026-07-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• COOLING7d [PATCH RFC 11/12] mm/slab: add slab_needs_objcg() helper
  2026-07-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• COOLING7d [PATCH RFC 10/12] mm/slab: reduce slabobj_ext memory with allocation profiling disabled
  2026-07-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>

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.

• COLD40d REVIEWED: 2 (2M) [PATCH v2 03/16] mm/slab: stop inlining __slab_alloc_node()
  2026-06-10 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 1 Reviewed-by
• COLD39d REVIEWED: 9 (9M) [PATCH v3 01/15] mm/slab: do not init any kfence objects on allocation
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 2 Reviewed-by
• COLD39d REVIEWED: 10 (10M) [PATCH v3 02/15] mm/slab: stop inlining __slab_alloc_node()
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 3 Reviewed-by
• COLD39d REVIEWED: 9 (9M) [PATCH v3 03/15] mm/slab: introduce slab_alloc_context
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 2 Reviewed-by
• COLD39d REVIEWED: 10 (10M) [PATCH v3 04/15] mm/slab: introduce alloc_flags and SLAB_ALLOC_NOLOCK
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 3 Reviewed-by
• COLD39d REVIEWED: 10 (10M) [PATCH v3 05/15] mm/slab: replace struct partial_context with slab_alloc_context
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 3 Reviewed-by
• COLD39d REVIEWED: 3 (3M) [PATCH v3 06/15] mm/slab: add alloc_flags to slab_alloc_context
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 2 Reviewed-by
• COLD39d REVIEWED: 8 (8M) [PATCH v3 07/15] mm/slab: pass alloc_flags to new slab allocation
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 2 Reviewed-by
• COLD39d REVIEWED: 8 (8M) [PATCH v3 09/15] mm/slab: replace slab_alloc_node() parameters with slab_alloc_context
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 2 Reviewed-by
• COLD39d REVIEWED: 7 (7M) [PATCH v3 10/15] mm/slab: allow kmem_cache_alloc_bulk() with any gfp flags
  2026-06-15 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org> · 1 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.

• STALE196d [PATCH V5 2/8] mm/slab: allow specifying free pointer offset when using constructor
  2026-01-05 · Harry Yoo <hidden>
• STALE193d [RFC PATCH v3 3/8] mm: restrict slub, compaction, and page_alloc to sysram
  2026-01-08 · Gregory Price <gourry@gourry.net>
• STALE195d [PATCH V6 2/9] mm/slab: allow specifying free pointer offset when using constructor
  2026-01-13 · Harry Yoo <hidden>
• STALE195d [PATCH V6 4/9] mm/slab: abstract slabobj_ext access via new slab_obj_ext() helper
  2026-01-13 · Harry Yoo <hidden>
• STALE195d [PATCH V6 7/9] mm/slab: save memory by allocating slabobj_ext array from leftover
  2026-01-13 · Harry Yoo <hidden>
• COLD35d [RFC PATCH v4 03/27] mm/page_alloc: add numa_zone_allowed() and wire it up
  2026-02-22 · Gregory Price <gourry@gourry.net>
• STALE138d [PATCH 1/2] mm/slab: move obj_exts_in_slab() definition to slab.h
  2026-03-10 · <hidden>
• COLD47d [PATCH RFC 03/15] mm/slab: introduce slab_alloc_context
  2026-06-09 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• COLD47d [PATCH RFC 04/15] mm/slab: introduce alloc_flags and SLAB_ALLOC_TRYLOCK
  2026-06-09 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
• COLD47d [PATCH RFC 05/15] mm/slab: add alloc_flags to slab_alloc_context
  2026-06-09 · "Vlastimil Babka (SUSE)" <vbabka@kernel.org>