linux-kernel - Re: [RFC v2 0/7] mm/damon: extend for page faults reporting based access monitoring

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Message-Id: <20250804165701.55642-1-sj@kernel.org>
Date: Mon,  4 Aug 2025 09:57:01 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Paniakin <apanyaki@...zon.com>
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Jann Horn <jannh@...gle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Michal Hocko" <mhocko@...e.com>,
	Mike Rapoport <rppt@...nel.org>,
	Pedro Falcato <pfalcato@...e.de>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	amazon-linux-kernel@...zon.com
Subject: Re: [RFC v2 0/7] mm/damon: extend for page faults reporting based access monitoring

On Sun, 3 Aug 2025 19:47:41 -0700 Andrew Paniakin <apanyaki@...zon.com> wrote:

> On 27/07/2025, SeongJae Park wrote:
> > TL; DR: Extend DAMON interface between core and operation sets for
> > operation set driven report-based monitoring such as per-CPU and
> > write-only access monitoring.  Further introduce an example physical
> > address space monitoring operation set that uses page faults as the
> > source of the information.
> 
> Thank you very much for starting this update. RFC mentions write-only
> monitoring, this feature particularly would be really helpful in some of
> our use cases such as lightweight live migration target selection, so we
> are looking forward to collaborate in development and testing activity!

Thank you for letting us know your interest, Andrew.  This should be helpful at
better prioritizations.

Now development trees of DAMON and DAMON user-space tool support[1] write-only
monitoring.  The implementation is dirty and not upstreamable for now, but
please feel free to test and let me know what you see if you don't mind.

I will continue working on more testing and making it upstreamable.

[1] https://damonitor.github.io/posts/write_only_cpus_only_monitoring/


Thanks,
SJ