Re: [PATCH 0/5] mm/khugepaged: add collapse hint machanism for khugepaged and use in mglru

[Karim Manaouil]

On Tue, Jun 09, 2026 at 03:44:21PM +0100, Lorenzo Stoakes wrote:
> On Tue, Jun 09, 2026 at 04:17:45AM -0600, Nico Pache wrote:
> > I had future plans for something similar as part of the thp=auto work;
> > however that requires significant thought and investigation into how
> > we can properly gather hints for collapse/split THP candidates. From
> > my perspective we'd want a more global structure/system outside of
> > khugepaged, that would directly call khugepaged (and others like
> > split, etc). It would also tie into the allocator so that at fault
> > time it could leverage the hints to make better decisions. My fear
> > with this series is that making a decision now might complicate future
> > work by adding complexity we may eventually want to remove for a
> > better solution.
> 
> I know this is future planning stuff, but I want to point out that we need
> to see significant rework of the THP code base before accepting any further
> major changes.
> 
> >
> > If you have the chance perhaps you can lead a discussion on your
> > proposal at the biweekly MM alignment session.
> >
> > +David Rientjes as he leads those discussions. We could use that time
> > to layout a plan for what needs to be done for this work, and for the
> > work surrounding thp=auto as I beleive they will be interdependent :)
> 
> We prefer to discuss THP topics in the THP cabal meeting, which both THP
> maintainers regularly attend :) having separate sessions we might not be aware
> of isn't really helpful.

Hi Lorenzo,

How to participate in the THP cabal meetings? Is there any public link
to join? I'm working recently on anti-fragmentation, which is kind of relevant...

Thanks
> And 'THP auto' is a broad topic rather than a new feature. I don't think it
> should be seen as a topic 'owned' by anybody, but rather something that we
> as a community should discuss.
> 
> Series that appear from nowhere trying to implement significant changes
> along those lines without community disucssion will not be hugely
> appreciated :)
> 
> Thanks, Lorenzo

-- 
~karim