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)

• DORMANTno replies Linux 7.2.10
  2026-10-11 13:53 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• WARM1d [PATCH 7.2 000/428] 7.2.10-rc1 review
  2026-10-09 14:26 · 2 replies in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COOLING5d [PATCH] mm/slub: clamp slab_min_order to MAX_PAGE_ORDER
  2026-10-07 16:34 · 0 replies in 7d · Sang-Heon Jeon <hidden>

Active reviewers (last 30 days)

• Eric Dumazet <hidden>
  3 attestations (3 Suggested-by) · last on 2026-09-30
• Willem de Bruijn <willemdebruijn.kernel@gmail.com>
  3 attestations (3 Suggested-by) · last on 2026-09-30
• Willem de Bruijn <willemb@google.com>
  3 attestations (3 Reviewed-by) · last on 2026-09-30
• Erhard Furtner <hidden>
  2 attestations (1 Reported-by, 1 Tested-by) · last on 2026-09-23
• Sashiko <sashiko-bot@kernel.org>
  1 attestation (1 Reported-by) · last on 2026-10-09
• Vlastimil Babka (SUSE) <vbabka@kernel.org>
  1 attestation (1 Reviewed-by) · last on 2026-10-09
• Shengming Hu <hidden>
  1 attestation (1 Reviewed-by) · last on 2026-10-09
• Suren Baghdasaryan <surenb@google.com>
  1 attestation (1 Suggested-by) · last on 2026-09-23
• Vlastimil Babka <hidden>
  1 attestation (1 Acked-by) · last on 2026-09-22

Recent patches

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

• WARM2d Re: Linux 7.2.10
  2026-10-11 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• WARM1d [PATCH 7.2 097/428] mm/slab: do not wake up kswapd in __kfree_rcu_sheaf()
  2026-10-09 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• WARM1d REVIEWED: 10 (9M) [PATCH 7.2 096/428] mm/slab: handle the !allow_spin case in kfree_rcu_sheaf()
  2026-10-09 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COOLING5d [PATCH] mm/slub: clamp slab_min_order to MAX_PAGE_ORDER
  2026-10-07 · Sang-Heon Jeon <hidden>
• COOLING10d Re: Linux 7.2.9
  2026-10-03 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday [PATCH] mm/slab: sample slab_state once in kmem_cache_destroy()
  2026-09-30 · Imre Kaloz <kaloz@kernel.org>
• DORMANTno replies REVIEWED: 1 (1M) [PATCH 5.15.y 1/2] net/packet: defer vmalloc TX_RING free until skbs finish
  2026-09-30 · Sasha Levin <sashal@kernel.org>
• COOLING13d REVIEWED: 1 (1M) [PATCH 6.1.y 1/2] net/packet: defer vmalloc TX_RING free until skbs finish
  2026-09-30 · Sasha Levin <sashal@kernel.org>
• COOLING13d REVIEWED: 1 (1M) [PATCH 6.6.y 1/2] net/packet: defer vmalloc TX_RING free until skbs finish
  2026-09-30 · Sasha Levin <sashal@kernel.org>
• COLD15d LANDED: 1 (0M) [PATCH v2] netfs: Fix missing alloc tagging of direct mempool allocations
  2026-09-23 · Hao Ge <hao.ge@linux.dev>
• COLD21d REVIEWED: 1 (0M) [PATCH 6.6.y 1/2] slab: Introduce kmalloc_obj() and family
  2026-09-22 · Sasha Levin <sashal@kernel.org>
• COLD22d Re: Linux 7.2.7
  2026-09-21 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.12.111
  2026-09-21 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD21d [PATCH 6.12 0939/1102] Revert "slab: reset slab->obj_ext when freeing and it is OBJEXTS_ALLOC_FAIL"
  2026-09-17 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD29d Re: Linux 6.12.110
  2026-09-14 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD21d [PATCH 6.12 1344/1376] slub: Dont call lockdep_unregister_key() for immature kmem_cache.
  2026-09-12 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD21d REVIEWED: 7 (6M) [PATCH 6.12 0750/1376] slab: Reuse first bit for OBJEXTS_ALLOC_FAIL
  2026-09-12 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD21d [PATCH 6.12 0749/1376] slab: Make slub local_(try)lock more precise for LOCKDEP
  2026-09-12 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD21d REVIEWED: 8 (7M) [PATCH 6.12 0748/1376] slab: simplify init_kmem_cache_nodes() error handling
  2026-09-12 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.18.51
  2026-09-11 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• COLD36d Re: Linux 7.2.4
  2026-09-07 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies REVIEWED: 2 (2M) [PATCH 6.6.y 3/3] mm/slub: fix missing debugfs entries for caches created before sysfs init
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD39d REVIEWED: 8 (7M) [PATCH 6.6.y 2/3] slab: simplify init_kmem_cache_nodes() error handling
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD39d REVIEWED: 8 (7M) [PATCH 6.6.y 1/3] locking/local_lock, mm: replace localtry_ helpers with local_trylock_t type
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• DORMANTno replies REVIEWED: 2 (2M) [PATCH 6.12.y 3/3] mm/slub: fix missing debugfs entries for caches created before sysfs init
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD39d REVIEWED: 9 (7M) [PATCH 6.12.y 2/3] mm/slab: move and refactor __kmem_cache_alias()
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD39d REVIEWED: 8 (7M) [PATCH 6.12.y 1/3] slab: simplify init_kmem_cache_nodes() error handling
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• DORMANTno replies REVIEWED: 2 (2M) [PATCH 6.18.y 2/2] mm/slub: fix missing debugfs entries for caches created before sysfs init
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD39d REVIEWED: 9 (7M) [PATCH 6.18.y 1/2] mm/slab: move and refactor __kmem_cache_alias()
  2026-09-04 · Sasha Levin <sashal@kernel.org>
• COLD19d LANDED [PATCH v3] mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
  2026-09-03 · "Harry Yoo (Meta)" <harry@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.

• DORMANTno replies REVIEWED: 1 (1M) [PATCH v2 1/3] tools/mm/slabinfo: Fix trace disable logic inversion
  2026-05-18 · Xuewen Wang <hidden> · 1 Reviewed-by
• STALE139d REVIEWED: 1 (0M) [PATCH 6.18 438/957] slab: Introduce kmalloc_obj() and family +956 more in this series
  2026-05-20 · Greg Kroah-Hartman <gregkh@linuxfoundation.org> · 1 Acked-by
• STALE95d REVIEWED: 1 (0M) [PATCH 6.18 1/4] slab: Introduce kmalloc_flex() and family +3 more in this series
  2026-07-09 · Eric Biggers <ebiggers@kernel.org> · 1 Acked-by
• STALE88d REVIEWED: 3 (3M) FAILED: patch "[PATCH] mm/slab: do not limit zeroing to orig_size when only red" failed to apply to 6.6-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 2 Reviewed-by
• DORMANTno replies REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: Fix trace disable logic inversion" failed to apply to 6.1-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 1 Reviewed-by
• DORMANTno replies REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: Fix trace disable logic inversion" failed to apply to 5.10-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 1 Reviewed-by
• DORMANTno replies REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: Fix trace disable logic inversion" failed to apply to 5.15-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 1 Reviewed-by
• STALE88d REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: fix total_objects attribute name" failed to apply to 6.1-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 1 Reviewed-by
• STALE88d REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: fix total_objects attribute name" failed to apply to 5.10-stable tree
  2026-07-14 · <gregkh@linuxfoundation.org> · 1 Reviewed-by
• STALE88d REVIEWED: 1 (1M) FAILED: patch "[PATCH] tools/mm/slabinfo: fix total_objects attribute name" failed to apply to 5.15-stable tree
  2026-07-14 · <gregkh@linuxfoundation.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 Re: Linux 6.18.19
  2026-03-19 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.19.9
  2026-03-19 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• STALE169d LANDED [PATCH mm-hotfixes v2 2/2] mm/slab: return NULL early from kmalloc_nolock() in NMI on UP
  2026-04-27 · "Harry Yoo (Oracle)" <harry@kernel.org>
• STALE159d Re: Linux 6.18.27
  2026-05-07 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 7.0.4
  2026-05-07 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.18.33
  2026-05-23 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies [PATCH 6.18.y] mm/slub: hold cpus_read_lock around flush_rcu_sheaves_on_cache()
  2026-06-01 · Sasha Levin <sashal@kernel.org>
• STALE134d Re: Linux 7.0.11
  2026-06-01 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.18.35
  2026-06-09 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• STALE95d [PATCH 6.18 2/4] add default_gfp() helper macro and use it in the new *alloc_obj() helpers +3 more in this series
  2026-07-09 · Eric Biggers <ebiggers@kernel.org>