Re: [PATCH 0/15] mm: introduce ANON_VMA_LAZY for deferred anon_vma creation

[Barry Song]

On Thu, Jun 4, 2026 at 12:03 PM wangtao <tao.wangtao@xxxxxxxxx> wrote:
[...]
> > > I won't echo what has already been said in this thread (and I didn't
> > > manage to read all, unfortunately), but for such big and invasive work
> > > it's often best to get in touch with the community earlier. Otherwise,
> > > you might end up wasting your time.
> > >
> > > Ok, arguably, someone who writes that code learns a lot on the way.
> > > And if this code really was written by one developer only, I tip my
> > > hat! I'd be curious if that code already ran somewhere on some Android
> > kernel out there?
> >
> > I heard from Zicheng that they have been running this for months and it
> > seems reasonably stable. Please correct me if I'm wrong, Zicheng :-). This
> > really should have been discussed with the community earlier.
> >
> I initially developed and debugged this based on the Android GKI branch
> and did some preliminary testing on an Android phone.
>
> Since GKI generally only accepts features merged from the upstream
> community, and this memory saving could also benefit the community, I
> ported the patch to the Linux master branch.
>
> Because my English is not very good and I rarely participate in the
> community, I am not familiar with the community workflow. I did not send
> an email for discussion in advance with an RFC tag. I apologize again.
>

No worries. I know someone who has worked on the Linux
kernel for many, many years and has excellent kernel
expertise, yet has never submitted a patch throughout his
career for various reasons.

I heard from Zicheng that you are HONOR's key MM expert
and have been guiding them on memory-management related
work. That's really impressive. Personally, I'd love to
see more ideas and contributions from you in the linux-mm
community.

BTW, regarding my earlier suggestion about using GKI
hooks—limiting the optimization to newly created VMAs and
to applications that never call fork()—do you have any
ideas on what the smallest possible hook change would look
like?

Thanks
Barry