Re: [LSF/MM/BPF TOPIC] MGLRU on Android: Real-World Problems and Challenges

[Kalesh Singh <kaleshsingh@google.com>]

On Wed, Feb 25, 2026 at 2:46 AM wangzicheng <wangzicheng@honor.com> wrote:
>
> > >
> > > We are happy to share more detailed data and experiments and to help
> > > with PoCs and large-scale validation if there is interest in
> > > pursuing these directions.

Hi Zicheng,

I would be very interested in joining this discussion at LSF/MM as well.

I actually just replied to Kairui's MGLRU thread noting some similar
observations we've made while evaluating MGLRU [1]. I think your
findings in Q3 regarding high reclaim costs and tasks waiting in
uninterruptible sleep corroborate the increased direct reclaim tail
latencies we have been investigating on our end.

It will be valuable to discuss your large-scale field data and see how
the workarounds you've implemented might inform the upstream
discussions alongside Kairui's proposals.

[1] https://lore.kernel.org/all/CAC_TJvfi_5n2crGHbRVO0R8jdYcSCmgzUJPzhtSvWeCN6fCbQg@mail.gmail.com/#t

Thanks,
Kalesh

> >
> > For obvious reasons I'm interested in this discussion. We also notice
> > some shortcomings of MGLRU and would like to collaborate on resolving
> > them.
> > Thanks,
> > Suren.
> >
> Hi Suren,
>
> thanks, we’d be very happy to work together on this.
>
> > >
> > > Reference
> > > [1] https://lore.kernel.org/linux-mm/20251128025315.3520689-1-
> > wangzicheng@honor.com/
> > > [2] https://android-
> > review.googlesource.com/c/kernel/common/+/3866554
> > > [3] https://android-
> > review.googlesource.com/c/kernel/common/+/3870920
> > > [4] https://lwn.net/Articles/1051882/
> > >
> > > --
> > > Best regards, and wishing you a prosperous Year of the Horse,
> > > Zicheng Wang