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

[wangzicheng <wangzicheng@honor.com>]

> > > >
> > > > 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_5n2crGHbRVO0R8jdYcSCmgzUJPzhtSv
> WeCN6fCbQg@mail.gmail.com/#t
> 
> Thanks,
> Kalesh
> 
Hi Kalesh,

Thanks for following up and for sharing your observations.
For Q3, we have only tried some approaches so far and don’t have a solid solution yet.
We’d be happy to share our field data and some Perfetto traces. We believe it would 
be very helpful to discuss with you and Kairui at LSF/MM/BPF.

Best,
Zicheng

> > >
> > > 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