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Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Masami Hiramatsu , Mathieu Desnoyers , Michal Hocko , Mike Rapoport , Shuah Khan , Shuah Khan , Steven Rostedt , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: Re: [RFC PATCH 00/19] mm/damon: introduce data attributes monitoring Date: Mon, 27 Apr 2026 17:33:11 -0700 Message-ID: <20260428003312.113061-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <14036b07-413e-4dcd-a363-e7f834d85da3@huawei-partners.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: wyo14mf95ugj86rs57fjzcyr77k3zgin X-Rspam-User: X-Rspamd-Queue-Id: E5F761C0008 X-Rspamd-Server: rspam07 X-HE-Tag: 1777336402-526100 X-HE-Meta: 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 tkrd8nuq R1tfUUHbNnSLiRIn0FhVlwZWBmqI/BehyKXWKMpENIrvAY2TGAhv3m47SMMB/izMavJ2uaod5cL65cjsnMNgUfo0+e4icbayvRICb6+OMuYCa2JMyX2LhGyXGiGraa6f2EctqdOm+kUls2lEruJ4V0GsJNZ7UIBijw7xCaQK04keYtWXf/C1I4KN0qrnG2SkMaOt8C2RUewNtKhDtebyD8rlguLg0d8VyURebL4keA52VfIRmnkQZ6DlW9tGON4Q9+RrrLo2fMpr0FQxsBngH38bX+8jVwGwj72Qg Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 27 Apr 2026 16:16:07 +0300 Gutierrez Asier wrote: > Hi SeonJae, > > On 4/26/2026 11:52 PM, SeongJae Park wrote: > > TL; DR > > ====== > > > > Extend DAMON for monitoring general data attributes other than accesses. > > This is for enabling light-weight page type (e.g., belonging cgroup) > > aware monitoring in short term. In long term, this will help extending > > DAMON for multiple access events capture primitives (e.g., page faults > > and PMU) and eventually pivotting DAMON to a "Data Attributes Monitoring > > and Operations eNgine" in long term. > > Very interesting. Looking forward to seeing this in upstream. Thank you! [...] > My main concern is about potential pollution of sysfs. DAMON is already > complex to set up, with a lot of knobs. Adding more configuration options > may make admin's job more complex. You are right, ther are a lot of knobs for DAMON. Nevertheless, each knob is simple and independent, so easy to scale. We also provide user-space tool for users who still want to use DAMON in highly customized way, and DAMON modules for users who want common purpose usage of DAMON with minimum tunable knobs. I believe the beginning part of DAMON usage document [2] is explaining this point. FWIW, I'm also working on DAMON-X [1] for making the modules based appraoch just works for more use cases. > > Do you plan to support this extension in damo user space? Yes, I will! [1] https://lore.kernel.org/linux-mm/20260307210250.204245-1-sj@kernel.org/ [2] Documentation/admin-guide/mm/damon/usage.rst Thanks, SJ [...]