[GIT PULL] slab updates for 7.4

[GIT PULL] slab updates for 7.4

[Harry Yoo]

Hi Linus,

please pull the latest slab updates from:

  git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4

There are no known conflicts with other trees.

Thanks,
Harry

======================================

- Performance improvement of the sheaf prefill API, by allowing the
  barn to hold a partial sheaf and refilling sheaves from the barn.
  This improves will-it-scale mmap1 throughput by 24% on the
  maple_node cache. (Hao Li)

- Restore memcg accounting of ipc msg_msg allocations, lost with
  e.g. CONFIG_SLAB_BUCKETS=n where the allocations fall back to the
  general kmalloc caches. (Kees Cook)

- Fix an old race between kmem_cache_destroy() and slab_late_init(),
  where a cache destroyed late in the boot process tries to release a
  kobject that was never initialized. (Imre Kaloz)

- Remove slab_folio(), the last use of struct folio in slab code.
  (Matthew Wilcox)

- Reject kmalloc() requests above KMALLOC_MAX_SIZE explicitly with a
  warning and NULL return instead of relying on the page allocator's
  order check. (Zi Yan)

- Various minor fixes and cleanups. (Hao Li, Karl Mehltretter,
  Kees Cook, Longlong Xia)

----------------------------------------------------------------
The following changes since commit cee9395acd8043be0644b25c34bfa86623f2b935:

  Linux 7.3-rc1 (2026-08-30 13:34:40 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4

for you to fetch changes up to d15d7703166daf7bd62c844a3cb1b3a6279adb4c:

  mm/slub: initialize the free pointer of the bootstrap kmem_cache_node (2026-10-19 11:57:03 +0100)

----------------------------------------------------------------
slab changes for 7.4

----------------------------------------------------------------
Hao Li (3):
      mm/slub: unify slub stat definitions to simplify metric additions
      mm/slub: make the case handling in __slab_free() easier to follow
      mm/slub: refill prefilled sheaves from the barn

Imre Kaloz (1):
      mm/slab: sample slab_state once in kmem_cache_destroy()

Karl Mehltretter (1):
      mm/slub: initialize the free pointer of the bootstrap kmem_cache_node

Kees Cook (2):
      mm/slab: Mark the kmem_buckets_create() context as a Context: section
      ipc, msg: Account msg_msg allocations with GFP_KERNEL_ACCOUNT again

Longlong Xia (1):
      mm/slab_common: reject zero object_size before calculate_alignment

Matthew Wilcox (Oracle) (1):
      slab: Remove slab_folio()

Zi Yan (1):
      mm/slab: reject unsupported kmalloc() sizes

 ipc/msgutil.c    |   3 +-
 mm/slab.h        |  28 ++---
 mm/slab_common.c |  23 ++--
 mm/slub.c        | 329 ++++++++++++++++++++++++++++++++++---------------------
 4 files changed, 228 insertions(+), 155 deletions(-)

-- 
Cheers,
Harry / Hyeonggon

Re: [GIT PULL] slab updates for 7.4

[Vlastimil Babka (SUSE)]

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On 10/22/26 15:10, Harry Yoo wrote:
> Hi Linus,
> 
> please pull the latest slab updates from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4
> 
> There are no known conflicts with other trees.

Thanks, Harry!

I felt I should endorse this as it's the first time Harry sends the PR as
the co-maintainer and not myself.
I looked into cross-signing the tag but seems like git doesn't support that.

Vlastimil

> Thanks,
> Harry
> 
> ======================================
> 
> - Performance improvement of the sheaf prefill API, by allowing the
>   barn to hold a partial sheaf and refilling sheaves from the barn.
>   This improves will-it-scale mmap1 throughput by 24% on the
>   maple_node cache. (Hao Li)
> 
> - Restore memcg accounting of ipc msg_msg allocations, lost with
>   e.g. CONFIG_SLAB_BUCKETS=n where the allocations fall back to the
>   general kmalloc caches. (Kees Cook)
> 
> - Fix an old race between kmem_cache_destroy() and slab_late_init(),
>   where a cache destroyed late in the boot process tries to release a
>   kobject that was never initialized. (Imre Kaloz)
> 
> - Remove slab_folio(), the last use of struct folio in slab code.
>   (Matthew Wilcox)
> 
> - Reject kmalloc() requests above KMALLOC_MAX_SIZE explicitly with a
>   warning and NULL return instead of relying on the page allocator's
>   order check. (Zi Yan)
> 
> - Various minor fixes and cleanups. (Hao Li, Karl Mehltretter,
>   Kees Cook, Longlong Xia)
> 
> ----------------------------------------------------------------
> The following changes since commit cee9395acd8043be0644b25c34bfa86623f2b935:
> 
>   Linux 7.3-rc1 (2026-08-30 13:34:40 -0700)
> 
> are available in the Git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4
> 
> for you to fetch changes up to d15d7703166daf7bd62c844a3cb1b3a6279adb4c:
> 
>   mm/slub: initialize the free pointer of the bootstrap kmem_cache_node (2026-10-19 11:57:03 +0100)
> 
> ----------------------------------------------------------------
> slab changes for 7.4
> 
> ----------------------------------------------------------------
> Hao Li (3):
>       mm/slub: unify slub stat definitions to simplify metric additions
>       mm/slub: make the case handling in __slab_free() easier to follow
>       mm/slub: refill prefilled sheaves from the barn
> 
> Imre Kaloz (1):
>       mm/slab: sample slab_state once in kmem_cache_destroy()
> 
> Karl Mehltretter (1):
>       mm/slub: initialize the free pointer of the bootstrap kmem_cache_node
> 
> Kees Cook (2):
>       mm/slab: Mark the kmem_buckets_create() context as a Context: section
>       ipc, msg: Account msg_msg allocations with GFP_KERNEL_ACCOUNT again
> 
> Longlong Xia (1):
>       mm/slab_common: reject zero object_size before calculate_alignment
> 
> Matthew Wilcox (Oracle) (1):
>       slab: Remove slab_folio()
> 
> Zi Yan (1):
>       mm/slab: reject unsupported kmalloc() sizes
> 
>  ipc/msgutil.c    |   3 +-
>  mm/slab.h        |  28 ++---
>  mm/slab_common.c |  23 ++--
>  mm/slub.c        | 329 ++++++++++++++++++++++++++++++++++---------------------
>  4 files changed, 228 insertions(+), 155 deletions(-)
> 


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Re: [GIT PULL] slab updates for 7.4

[Harry Yoo]

On Thu, Oct 22, 2026 at 03:37:19PM +0200, Vlastimil Babka (SUSE) wrote:
> On 10/22/26 15:10, Harry Yoo wrote:
> > Hi Linus,
> > 
> > please pull the latest slab updates from:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4
> > 
> > There are no known conflicts with other trees.
> 
> Thanks, Harry!

No problem ;)
You've been doing the hard work alone for years... now time to help.

> I felt I should endorse this as it's the first time Harry sends the PR as
> the co-maintainer and not myself.

Thank you for the endorsement, Vlastimil!

> I looked into cross-signing the tag but seems like git doesn't support that.

Yeah, apparently not a thing in git.
I see you signed the email instead! :)

> Vlastimil

-- 
Cheers,
Harry / Hyeonggon

Re: [GIT PULL] slab updates for 7.4

[pr-tracker-bot]

The pull request you sent on Thu, 22 Oct 2026 14:10:13 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/mm/slab.git tags/slab-for-7.4

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/7a78f7ba9f24962c8033e0152bf34a7903ff61ba

Thank you!

-- 
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