Re: [Lsf-pc] [LSF/MM/BPF TOPIC] The future of anon_vma

[Jan Kara <jack@suse.cz>]

On Thu 09-01-25 12:33:52, Lorenzo Stoakes wrote:
> On Thu, Jan 09, 2025 at 11:21:02AM +0100, Jan Kara wrote:
> > On Wed 08-01-25 22:23:16, Lorenzo Stoakes via Lsf-pc wrote:
> > > A future where we unify anonymous and file-backed memory mappings would be
> > > one in which a reflinks were implemented at a general level rather than, as
> > > they are now, implemented individually within file systems.
> > >
> > > I'd like to discuss how feasible doing so might be, whether this is a sane
> > > line of thought at all, and how a roadmap for working towards the
> > > elimination of anon_vma as it stands might look.
> >
> > As you can imagine this has been discussed in the past and some folks are
> > very interested in saving page cache memory for some heavily reflinked
> > container setups or for various FUSE filesystems. So if someone manages to
> > come up with a feasible design, the usecases are there. I think reading
> > e.g. [1] and comments below it is a good preparation for the session to get
> > some idea what challenges are there :).
> 
> Oh I certainly imagined that it had :) Perhaps you are volunteering to
> assist me from an fs point of view on this Jan? ;)

Sure, I'll be happy to provide you with a FS point of view :)

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR