Re: [LSF/MM/BPF TOPIC] Improving MGLRU

[Axel Rasmussen <axelrasmussen@google.com>]

On Fri, Feb 27, 2026 at 9:56 AM Shakeel Butt <shakeel.butt@linux.dev> wrote:
>
> On Thu, Feb 26, 2026 at 03:54:22PM +0000, Matthew Wilcox wrote:
> > On Fri, Feb 20, 2026 at 01:25:33AM +0800, Kairui Song wrote:
> > > MGLRU has been introduced in the mainline for years, but we still have two LRUs
> > > today. There are many reasons MGLRU is still not the only LRU implementation in
> > > the kernel.
> >
> > To my mind, the biggest problem with MGLRU is that Google dumped it on us
> > and ran away.  Commit 44958000bada claimed that it was now maintained and
> > added three people as maintainers.  In the six months since that commit,
> > none of those three people have any commits in mm/!  This is a shameful
> > state of affairs.
> >
> > I say rip it out.
>
> I have very similar concerns. Though rather than ripping it out, I would like
> we put efforts in unifying the two reclaim mechanism (traditional & MGLRU) over
> improving MGLRU.

Shakeel, I think this is a great idea. If you have any ideas around
low hanging fruit here, please share. I'm planning to invest much more
time here going forward, so I'd be happy to turn some ideas into
patches. :)

>
> >