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Date: Fri, 11 Sep 2026 16:19:20 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: SJ Park <sj@kernel.org>
Cc: "Liam R. Howlett" <liam@infradead.org>, David Hildenbrand
 <david@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Lorenzo Stoakes
 <ljs@kernel.org>, Michal Hocko <mhocko@suse.com>, Mike Rapoport
 <rppt@kernel.org>, Randy Dunlap <rdunlap@infradead.org>, Shuah Khan
 <skhan@linuxfoundation.org>, Suren Baghdasaryan <surenb@google.com>,
 Vlastimil Babka <vbabka@kernel.org>, damon@lists.linux.dev,
 linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2 0/7] mm/damon: introduce probe_hits_wsum DAMOS core
 filter
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On Fri, 11 Sep 2026 06:55:02 -0700 SJ Park <sj@kernel.org> wrote:

> DAMON can do flexible data attributes monitoring.  The classical data
> access monitoring can also be done using the attributes monitoring.  The
> access event is just one of the data attributes that DAMON supports.
> Users do monitoring to make some actions based on it.  DAMOS is a
> feature for automating that.  However, DAMOS cannot utilize the data
> attributes monitoring results.  It is still Data "Access"
> Monitoring-based Operation Schemes.  It requires users to set the target
> "access" pattern.
> 
> DAMOS core filter is effectively the same as the target access pattern.
> It is just a more generalized and flexible way of describing the
> operation action target region.  Introduce a new DAMOS core filter type,
> probe_hits_wsum.  It specifies the filter target based on a range of the
> probe hits weighted sum.  Using this, users can apply DAMOS actions to
> regions of specific data attributes pattern.
> 
> Note that the classic target access pattern still works.  Hence the
> target nr_accesses range should still be properly configured.  The new
> filter would be used in only data attributes-only mode.  In the mode,
> classic access monitoring is just turned off, and therefore nr_accesses
> of regions are always zero.  Users could simply set the target
> nr_accesses range to include the zero nr_Accesses regions.

Thanks, added.  Along with your -fix for [1/7].