linux-kernel - Re: [PATCH] MAINTAINERS: add mm GUP section

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Message-ID: <aBsu7FnLjpF5rx3P@pc636>
Date: Wed, 7 May 2025 11:59:08 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	David Hildenbrand <david@...hat.com>
Cc: Uladzislau Rezki <urezki@...il.com>,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Gunthorpe <jgg@...dia.com>,
	John Hubbard <jhubbard@...dia.com>, Peter Xu <peterx@...hat.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH] MAINTAINERS: add mm GUP section

On Wed, May 07, 2025 at 10:23:34AM +0100, Lorenzo Stoakes wrote:
> +cc Vlastimil for page_alloc.c stuff.
> 
> On Wed, May 07, 2025 at 11:02:00AM +0200, Uladzislau Rezki wrote:
> > On Wed, May 07, 2025 at 10:05:58AM +0200, David Hildenbrand wrote:
> > > On 07.05.25 01:21, Andrew Morton wrote:
> > > > On Tue,  6 May 2025 18:36:01 +0100 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:
> > > >
> > > > > As part of the ongoing efforts to sub-divide memory management
> > > > > maintainership and reviewership, establish a section for GUP (Get User
> > > > > Pages) support and add appropriate maintainers and reviewers.
> > > > >
> > > >
> > > > Thanks, I was wondering about that.
> > >
> > > Thanks Lorenzo for driving this!
> > >
> > > Acked-by: David Hildenbrand <david@...hat.com>
> 
> Thanks David!
> 
> Am trying to strike while the iron is hot post-lsf and discuss with people and
> set things in motion :)
> 
> > >
> > > >
> > > > (looks at vmscan.c)
> > >
> > > Current maintainers (mm/unstable) on 20 biggest files in mm, Andrew is
> > > implicit:
> > >
> > >  $ find mm -name "*.c" -type f | xargs wc -l | sort -n -r | head -20
> > >  198195 total
> > >    7937 mm/hugetlb.c		# Muchun
> > >    7881 mm/slub.c		# Christoph/David/Vlastimil
> > >    7745 mm/vmscan.c		#
> 
> This is, as Andrew rightly points out, a key one, I will have a look around
> the git history and put something together here. I'm not sure if we will
> get an M here, but at least can populate some reviewers.
> 
> > >    7424 mm/page_alloc.c		#
> 
> Yeah Vlastimil put effort into sorting out reviewers here (thanks
> Vlastimil!) but nobody's stepped up for an M yet :)
> 
> > >    7166 mm/memory.c		# David
> > >    5962 mm/shmem.c		# Hugh
> > >    5553 mm/memcontrol.c		# Johannes/Roman/Shakeel
> > >    5245 mm/vmalloc.c		#
> 
> As discussed below 100% Ulad is very clearly the right guy for M (and who
> has graciously offered his services as such) :>)
> 
> Ulad - do you want to send a patch upgrading yourself there? cc me and
> David, I will happily ack of course, and I suspect David as well!
> 
I will :)

> > >    4703 mm/huge_memory.c	# David
> > >    4538 mm/filemap.c		# Willy
> > >    3964 mm/swapfile.c		#
> 
> The various discussions at LSF lend themselves to suggesting people here,
> can take a look at this also.
> 
> > >    3871 mm/ksm.c		#
> 
> As per discussion below, thanks for suggesting yourself David, I hope this
> is a case of 'well de facto I am maintaining this' rather than taking
> anything new on, as I worry about how much your workload involves :P
> 
> I will sniff around the git history too and put something together.
> 
> > >    3720 mm/gup.c		# David
> > >    3675 mm/mempolicy.c		#
> 
> Ack below, and will take a look here also.
> 
> > >    3371 mm/percpu.c		# Dennis/Tejun/Christoph
> > >    3370 mm/compaction.c		#
> 
> As you say lots of R's which is good.
> 
> As per below would you want M for this?
> 
> I will take a look also.
> 
> > >    3197 mm/page-writeback.c	# Willy
> > >    3097 mm/vma.c		# Liam/Lorenzo
> > >    2988 mm/rmap.c		# David/Lorenzo
> 
> > >
> > > I've been messing with KSM for a long time, so I could easily jump in as
> > > maintainer for that. Probably we want page migration (incl. mempolicy?) as a
> > > separate entry. I've been messing with that as well (and will be messing
> > > more), so I could jump in for that as well.
> > >
> > > For page allocator stuff (incl. compaction) we at least have plenty of
> > > reviewers now. For vmalloc we at least have Uladzislau as single reviewer.
> > >
> > > vmscan.c and vmalloc.c really need some love.
> > >
> > As for "vmalloc.c" i can jump in as an extra maintainer aside with
> > Andrew if no objections.
> 
> Entirely the opposite of an objection, I'd be aghast if you weren't a
> maintainer there, thank you for your excellent work in vmalloc, you're a
> top chap and we're very lucky to have you working on this!
> 
Thank you i send out that patch today and put into CC you and David!

--
Uladzislau Rezki