[GIT PULL] slab updates for 6.17

[GIT PULL] slab updates for 6.17

[Vlastimil Babka]

Hi Linus,

please pull the latest slab updates from:

  git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git tags/slab-for-6.17

We've hit a last-minute snag last week when lkp reported [1] the commit
"mm, slab: use frozen pages for large kmalloc" exposed a pre-existing bug
in siw_tcp_sendpages(). Pedro has been fixing it [2] so hopefully that will
result in a PR soon, which you can pull before this one - or perhaps take
the fix directly. If that gets stuck for some reason and taking the fix
later would be unacceptable, I can do another PR with my commit taken out.

[1] https://lore.kernel.org/all/202507220801.50a7210-lkp@intel.com/
[2] https://lore.kernel.org/all/20250723104123.190518-1-pfalcato@suse.de/

Thanks,
Vlastimil

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

* Convert struct slab to its own flags instead of referencing page flags,
  which is another preparation step before separating it from struct page
  completely. Along with that, a bunch of documentation fixes and cleanups.
  (Matthew Wilcox)

* Convert large kmalloc to use frozen pages in order to be consistent with
  non-large kmalloc slabs (Vlastimil Babka)

* MAINTAINERS updates (Matthew Wilcox, Lorenzo Stoakes)

* Restore NUMA policy support for large kmalloc, broken by mistake in v6.1
  (Vlastimil Babka)

----------------------------------------------------------------
Jonathan Corbet (1):
      slub: Fix a documentation build error for krealloc()

Lorenzo Stoakes (1):
      MAINTAINERS: add missing files to slab section

Matthew Wilcox (Oracle) (9):
      doc: Move SLUB documentation to the admin guide
      slab: Rename slab->__page_flags to slab->flags
      slab: Add SL_partial flag
      slab: Add SL_pfmemalloc flag
      doc: Add slab internal kernel-doc
      vmcoreinfo: Remove documentation of PG_slab and PG_hugetlb
      kfence: Remove mention of PG_slab
      memcg_slabinfo: Fix use of PG_slab
      slab: Update MAINTAINERS entry

Vlastimil Babka (2):
      mm, slab: restore NUMA policy support for large kmalloc
      mm, slab: use frozen pages for large kmalloc

 Documentation/ABI/testing/sysfs-kernel-slab        |  5 +-
 Documentation/admin-guide/kdump/vmcoreinfo.rst     |  8 +--
 Documentation/admin-guide/kernel-parameters.txt    | 12 ++--
 Documentation/admin-guide/mm/index.rst             |  1 +
 .../{mm/slub.rst => admin-guide/mm/slab.rst}       | 19 +++--
 Documentation/mm/index.rst                         |  1 -
 Documentation/mm/slab.rst                          |  7 ++
 MAINTAINERS                                        | 17 +++--
 include/linux/mm.h                                 |  4 +-
 mm/kfence/core.c                                   |  4 +-
 mm/slab.h                                          | 28 +-------
 mm/slub.c                                          | 80 ++++++++++++++++------
 tools/cgroup/memcg_slabinfo.py                     |  4 +-
 13 files changed, 110 insertions(+), 80 deletions(-)
 rename Documentation/{mm/slub.rst => admin-guide/mm/slab.rst} (97%)

Re: [GIT PULL] slab updates for 6.17

[Linus Torvalds]

On Mon, 28 Jul 2025 at 09:56, Vlastimil Babka <vbabka@suse.cz> wrote:
>
> We've hit a last-minute snag last week when lkp reported [1] the commit
> "mm, slab: use frozen pages for large kmalloc" exposed a pre-existing bug
> in siw_tcp_sendpages(). Pedro has been fixing it [2] so hopefully that will
> result in a PR soon, which you can pull before this one - or perhaps take
> the fix directly. If that gets stuck for some reason and taking the fix
> later would be unacceptable, I can do another PR with my commit taken out.
>
> [1] https://lore.kernel.org/all/202507220801.50a7210-lkp@intel.com/
> [2] https://lore.kernel.org/all/20250723104123.190518-1-pfalcato@suse.de/

Thanks for the heads up.

I've pulled this, although I don't see the rdma fix in the rdma tree
(the pull for which is still pending in my inbox - I've merged a big
chunk already, people have been very good about sending their pulls
early - thanks)

Let's hope that gets handled soonish - but I'm adding Jason explicitly
to the cc just so that he sees this.

I'll take the fix directly in the worst case, but prefer for things to
go through the normal subsystem maintainer if at all possible, and
this one seems fairly straightforward.

             Linus

Re: [GIT PULL] slab updates for 6.17

[Jason Gunthorpe]

On Wed, Jul 30, 2025 at 11:42:21AM -0700, Linus Torvalds wrote:
> On Mon, 28 Jul 2025 at 09:56, Vlastimil Babka <vbabka@suse.cz> wrote:
> >
> > We've hit a last-minute snag last week when lkp reported [1] the commit
> > "mm, slab: use frozen pages for large kmalloc" exposed a pre-existing bug
> > in siw_tcp_sendpages(). Pedro has been fixing it [2] so hopefully that will
> > result in a PR soon, which you can pull before this one - or perhaps take
> > the fix directly. If that gets stuck for some reason and taking the fix
> > later would be unacceptable, I can do another PR with my commit taken out.
> >
> > [1] https://lore.kernel.org/all/202507220801.50a7210-lkp@intel.com/
> > [2] https://lore.kernel.org/all/20250723104123.190518-1-pfalcato@suse.de/
> 
> Thanks for the heads up.
> 
> I've pulled this, although I don't see the rdma fix in the rdma tree
> (the pull for which is still pending in my inbox - I've merged a big
> chunk already, people have been very good about sending their pulls
> early - thanks)

It is not there, it was unclear in the emails what should happen and I
did not want to delay things due to your travel note.

> I'll take the fix directly in the worst case, but prefer for things to
> go through the normal subsystem maintainer if at all possible, and
> this one seems fairly straightforward.

I think it will be easiest for all if I send a one patch PR after you pick up
the main RDMA PR in the next few days. siw is not so critical that we
need to rush.

Thanks,
Jason

Re: [GIT PULL] slab updates for 6.17

[Vlastimil Babka]

On 7/30/25 20:47, Jason Gunthorpe wrote:
> On Wed, Jul 30, 2025 at 11:42:21AM -0700, Linus Torvalds wrote:
>> On Mon, 28 Jul 2025 at 09:56, Vlastimil Babka <vbabka@suse.cz> wrote:
>> >
>> > We've hit a last-minute snag last week when lkp reported [1] the commit
>> > "mm, slab: use frozen pages for large kmalloc" exposed a pre-existing bug
>> > in siw_tcp_sendpages(). Pedro has been fixing it [2] so hopefully that will
>> > result in a PR soon, which you can pull before this one - or perhaps take
>> > the fix directly. If that gets stuck for some reason and taking the fix
>> > later would be unacceptable, I can do another PR with my commit taken out.
>> >
>> > [1] https://lore.kernel.org/all/202507220801.50a7210-lkp@intel.com/
>> > [2] https://lore.kernel.org/all/20250723104123.190518-1-pfalcato@suse.de/
>> 
>> Thanks for the heads up.
>> 
>> I've pulled this, although I don't see the rdma fix in the rdma tree

Thanks.

>> (the pull for which is still pending in my inbox - I've merged a big
>> chunk already, people have been very good about sending their pulls
>> early - thanks)
> 
> It is not there, it was unclear in the emails what should happen and I
> did not want to delay things due to your travel note.
> 
>> I'll take the fix directly in the worst case, but prefer for things to
>> go through the normal subsystem maintainer if at all possible, and
>> this one seems fairly straightforward.
> 
> I think it will be easiest for all if I send a one patch PR after you pick up
> the main RDMA PR in the next few days. siw is not so critical that we
> need to rush.

Great, thanks. The last version with ack from Bernard is here:

https://lore.kernel.org/all/20250729120348.495568-1-pfalcato@suse.de/

> Thanks,
> Jason

Re: [GIT PULL] slab updates for 6.17

[Linus Torvalds]

On Wed, 30 Jul 2025 at 11:47, Jason Gunthorpe <jgg@nvidia.com> wrote:
>
> I think it will be easiest for all if I send a one patch PR after you pick up
> the main RDMA PR in the next few days. siw is not so critical that we
> need to rush.

Ack, sounds good.

            Linus

Re: [GIT PULL] slab updates for 6.17

[pr-tracker-bot]

The pull request you sent on Mon, 28 Jul 2025 18:56:40 +0200:

> git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git tags/slab-for-6.17

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/e8d780dcd957d80725ad5dd00bab53b856429bc0

Thank you!

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