Re: [RFC PATCH] mm/damon/reclaim: add 'available' memory as an optional watermarks metric

[SJ Park <sj@kernel.org>]

On Sun, 28 Jun 2026 16:55:38 +0800 Liew Rui Yan <aethernet65535@gmail.com> wrote:

> On Sat, 27 Jun 2026 15:26:43 -0700 SJ Park <sj@kernel.org> wrote:
> 
> > > I will drop this patch. I think controlling DAMOS pause/rusume
> > > separately might be better suited for execution in user space (such as
> > > controlling‘quota_ms’ and ‘quota_sz’).
> > 
> > For explicit DAMOS-only pause/resume, you may also be interested in
> > max_nr_snapshots [1] feature.
> 
> Thank you for the pointer to the 'max_nr_snapshots' feature!

Feel free to let me know if you have any question for the feature.

> 
> > > 
> > > By the way, I sent you an email about three weeks ago (Fri, 5 Jun 2026
> > > 20:28:00 +0800) introducing a userspace auto-tuner program I wrote for
> > > DAMON_RECLAIM's 'min_age', and asking for your thoughts. I am not sure
> > > if it reached you, could you please check? I would really appreciate
> > > your feedback on that as well.
> > 
> > I don't recall that mail.  Did you send that to damon@lists.linux.dev or other
> > public mailing lists?  If so, could you share the message id or lore.kernel.org
> > link of the mail?  If not, could you please resend?
> 
> I hadn't previously sent this to damon@lists.linux.dev or any public
> mailing list.
> 
> Since I have completely rewritten it (the email) and it focuses on a
> standalone userspace program/daemon, I have submitted it as a new
> independent RFC thread [1] to avoid biasing this patch's topic.

Makes perfect sense.  I will review.

> 
> > [1] https://lkml.kernel.org/r/20251216080128.42991-8-sj@kernel.org
> 
> [1] https://lore.kernel.org/damon/20260628085155.20828-1-aethernet65535@gmail.com


Thanks,
SJ

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