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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-52db62764f2sm1152051cf.30.2026.08.16.17.49.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Aug 2026 17:49:27 -0700 (PDT) Date: Sun, 16 Aug 2026 20:49:24 -0400 From: Gregory Price To: Qiqi Li Cc: linux-mm@kvack.org, Zhigang.Luo@amd.com, arun.george@samsung.com, balbirs@nvidia.com, brendan.jackman@linux.dev, yuzenghui@huawei.com, apopple@nvidia.com, alucerop@amd.com, matthew.brost@intel.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, corbet@lwn.net, skhan@linuxfoundation.org, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, djbw@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, alison.schofield@intel.com, osandov@osandov.com, jannh@google.com, pfalcato@suse.de, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, pbonzini@redhat.com, osalvador@suse.de, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, yury.norov@gmail.com, linux@rasmusvillemoes.dk, longman@redhat.com, ridong.chen@linux.dev, tj@kernel.org, mkoutny@suse.com, sj@kernel.org, jgg@ziepe.ca, jhubbard@nvidia.com, peterx@redhat.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, lance.yang@linux.dev, usama.arif@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, roman.gushchin@linux.dev, muchun.song@linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, driver-core@lists.linux.dev, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-debuggers@vger.kernel.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, cgroups@vger.kernel.org, damon@lists.linux.dev, linux-kselftest@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH v5 25/36] mm/memory_hotplug: support N_MEMORY_PRIVATE node hotplug Message-ID: References: <20260720193431.3841992-1-gourry@gourry.net> <20260720193431.3841992-26-gourry@gourry.net> <6840c720-8cb7-46bb-a652-040c130a4427@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6840c720-8cb7-46bb-a652-040c130a4427@huawei.com> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B2219140009 X-Stat-Signature: rnhzstcb7rpyxiwkt3apineifs9pc5bz X-HE-Tag: 1786927768-453722 X-HE-Meta: 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 Hai9DNH+ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 06, 2026 at 11:30:08AM +0800, Qiqi Li wrote: > Hi Gregory, > > On 7/21/2026 3:34 AM, Gregory Price wrote: > > > Add add_private_memory_driver_managed() to let modules hotplug > > memory onto an N_MEMORY_PRIVATE node they control. > > I am trying to understand how the nid passed to > add_private_memory_driver_managed() is expected to be provisioned. > > From what I can see, both node_private_register() and > __add_memory_resource() require the nid to already be present in > node_possible_map. My understanding is therefore that this patch > supports hotplugging private memory onto an existing possible node, > rather than creating a new possible node ID at runtime. > > For example, in the use case I am looking at, the device's private > node is not described by firmware. Would its nid need to be reserved > during early NUMA initialization, or is there another mechanism that > I may have missed? > It would need to be reserved, and you could use numa emulation but that's clunky. I have an RFC for exactly this issue - though i haven't pushed it further yet. https://lore.kernel.org/all/20260610014517.253609-1-gourry@gourry.net/ > Also, could you please Cc me on future revisions of this series? > I would appreciate it and would be happy to follow the work:) > > Thanks, > Qiqi