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Thu, 16 Apr 2026 13:23:11 -0700 (PDT) Date: Thu, 16 Apr 2026 16:23:06 -0400 From: Gregory Price To: Frank van der Linden Cc: "David Hildenbrand (Arm)" , lsf-pc@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, damon@lists.linux.dev, kernel-team@meta.com, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, dave@stgolabs.net, jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, dan.j.williams@intel.com, longman@redhat.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, osalvador@suse.de, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, yury.norov@gmail.com, linux@rasmusvillemoes.dk, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, jackmanb@google.com, sj@kernel.org, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, muchun.song@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, jannh@google.com, linmiaohe@huawei.com, nao.horiguchi@gmail.com, pfalcato@suse.de, rientjes@google.com, shakeel.butt@linux.dev, riel@surriel.com, harry.yoo@oracle.com, cl@gentwo.org, roman.gushchin@linux.dev, chrisl@kernel.org, kasong@tencent.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, zhengqi.arch@bytedance.com, terry.bowman@amd.com Subject: Re: [LSF/MM/BPF TOPIC][RFC PATCH v4 00/27] Private Memory Nodes (w/ Compressed RAM) Message-ID: References: <20260222084842.1824063-1-gourry@gourry.net> <3342acb5-8d34-4270-98a2-866b1ff80faf@kernel.org> <2608a03b-72bb-4033-8e6f-a439502b5573@kernel.org> <38cf52d1-32a8-462f-ac6a-8fad9d14c4f0@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Apr 15, 2026 at 12:47:50PM -0700, Frank van der Linden wrote: > > > > > I also have some questions about longterm pinnings, but that's better > > > discussed in person :) > > > > > > > The longterm pin extention came from auditing existing zone_device > > filters. > > > > tl;dr: informative mechanism - but it probably should be dropped, > > it makes no sense (it's device memory, pinnings mean nothing?). > > > > ... snip ... stitching together some context here > > So, looking at having some properties set at the node level makes > sense to me even in the non-device case. But perhaps that is out of > scope for the initial discussion. I think there's an argument burried in this observation (useful for non-device case) that suggests there could be a world where longterm pinning on this memory makes sense. But it doesn't need to be introduced from the start, and it's a 5-10 line change to add it in later, so I think it will get trimmed unless there's a user out there actively experimenting with it. ~Gregory