linux-kernel - Re: [PATCH 2/2] MAINTAINERS: add section for locking of mm's and VMAs

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Message-ID: <5f24262e-dd11-462c-abc8-29b71c0e820c@lucifer.local>
Date: Wed, 16 Apr 2025 07:47:23 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        SeongJae Park <sj@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 2/2] MAINTAINERS: add section for locking of mm's and VMAs

On Tue, Apr 15, 2025 at 11:00:52AM -0700, Shakeel Butt wrote:
> On Tue, Apr 15, 2025 at 04:43:41PM +0100, Lorenzo Stoakes wrote:
> > On Tue, Apr 15, 2025 at 11:37:04AM -0400, Liam R. Howlett wrote:
> > > * Lorenzo Stoakes <lorenzo.stoakes@...cle.com> [250415 09:11]:
> > > > We place this under memory mapping as related to memory mapping
> > > > abstractions in the form of mm_struct and vm_area_struct (VMA). Now we have
> > > > separated out mmap/vma locking logic into the mmap_lock.c and mmap_lock.h
> > > > files, so this should encapsulate the majority of the mm locking logic in
> > > > the kernel.
> > > >
> > > > Suren is best placed to maintain this logic as the core architect of VMA
> > > > locking as a whole.
> > > >
> > > > Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> > > > ---
> > > >  MAINTAINERS | 15 +++++++++++++++
> > > >  1 file changed, 15 insertions(+)
> > > >
> > > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > > index 8d834514a047..ce55676a16a4 100644
> > > > --- a/MAINTAINERS
> > > > +++ b/MAINTAINERS
> > > > @@ -15595,6 +15595,21 @@ F:	mm/vma_internal.h
> > > >  F:	tools/testing/selftests/mm/merge.c
> > > >  F:	tools/testing/vma/
> > > >
> > > > +MEMORY MAPPING - LOCKING
> > > > +M:	Andrew Morton <akpm@...ux-foundation.org>
> > > > +M:	Suren Baghdasaryan <surenb@...gle.com>
> > > > +R:	Liam R. Howlett <Liam.Howlett@...cle.com>
> > > > +R:	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> > > > +R:	Vlastimil Babka <vbabka@...e.cz>
> > > > +L:	linux-mm@...ck.org
> > > > +S:	Maintained
> > > > +W:	http://www.linux-mm.org
> > > > +T:	git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> > > > +F:	Documentation/mm/process_addrs.rst
> > > > +F:	include/linux/mmap_lock.h
> > > > +F:	include/trace/events/mmap_lock.h
> > > > +F:	mm/mmap_lock.c
> > >
> > > It would be good to have more M's here in the case Suren is away or
> > > whatever.
> > >
> > > I have worked on the mmap locking due to the maple tree addition, and I
> > > have helped with vma locking in some areas.
> > >
> > > Lorenzo wrote the locking document, which Suren pointed out last mmap
> > > lock meeting and does make locking changes.
> > >
> > > Are there others that could be M here?
> >
> > I mean I'm fine to take an M here, based on having done _some_ work in this
> > area and being involved in the meetings and documenting, though I'd largely
> > defer to Suren who was the true expertise, and I also feel Liam has better
> > knowledge than I do.
> >
> > So I suggest probably, unless there are other viable and active takers, we
> > should M myself and you Liam?
> >
> > >
> > > Shakeel and/or Jann might be good additions to this list somewhere
> > > (looking at the edits to the file).
> >
> > Don't mind R in these cases if Shakeel or Jann want of course :),
>
> Thanks Liam. I don't mind an R here if you decide to send a new version.
>
> Reviewed-by: Shakeel Butt <shakeel.butt@...ux.dev>

Sure, thanks for volunteering, happy to have you :) am going to do a
respin, will add there.

I believe Jann is currently out, so he can let us know at a later date if
he'd like to be added, I didn't want to presume!

>