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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c37f4a63b9sm232749985a.3.2026.01.06.11.59.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jan 2026 11:59:56 -0800 (PST) Date: Tue, 6 Jan 2026 14:59:21 -0500 From: Gregory Price To: "David Hildenbrand (Red Hat)" Cc: hare@suse.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, osalvador@suse.de, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com Subject: Re: [RFC PATCH] memory,memory_hotplug: allow restricting memory blocks to zone movable Message-ID: References: <20260105203611.4079743-1-gourry@gourry.net> <7f053290-6b9a-4d18-936e-0f28006c79c3@kernel.org> <9575e042-39f4-4f01-80db-34aaaa9312e6@kernel.org> <616f97b7-24e0-4134-a08d-5abaf07a8b09@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <616f97b7-24e0-4134-a08d-5abaf07a8b09@kernel.org> X-Stat-Signature: 8ri9bdadw15cyapj5te4xkrb1hfoy3d1 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 8773C14000F X-HE-Tag: 1767729597-461779 X-HE-Meta: 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 Trf2ohZ2 MpuLgUcVZANfCRgFSPj38aQC6m80yGW9ug5zbUzynfK2kVcwbdwWP2Yxi+j9znsAzCSTHxbExLGbQt4UDRedYiJVfJ2N2o/fU9EYbYKquaC3SmcaZzTDBYIWaIxk5hf5txzj+vssoWCDLoGHwHyGNaEgKq6lh1bkPW8u83pomqXIHS3g57Q5BavLaku5/YlT1ylKkMEn4/9SqKaQl/0r+kh6KASMfOiooxQVNsuu+f8uZ4gHP+6l3dapy/s344dnCnIrr3ojAsuBPMXPgMozzvjUNCNWXYorUlIekQrGCWrncn21uMETtiMXzyiai6OzD4LbJT1bJqytyjOTL8yYIeXsFeoKOlbXPbqzHKutqvZ/0PpqfJzsK3aCBlQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jan 06, 2026 at 07:38:54PM +0100, David Hildenbrand (Red Hat) wrote: > On 1/6/26 19:06, Gregory Price wrote: > > On Tue, Jan 06, 2026 at 06:52:11PM +0100, David Hildenbrand (Red Hat) wrote: > > > On 1/6/26 17:58, Gregory Price wrote: > > > > Fair, I'll revist this once Hannes gets a chance to chime in. > > > > This was effective at getting the discussion started though :P > > Hehe, yes. > > Another thing to look into would be to provide a way for ndctl to just > add+online the memory in one shot, without having to go back to walking > memory blocks to online them etc. > I think it's the opposite: offline+remove needing to be done in one step while holding the hotplug lock. Right now, I think you have to do something like daxctl offline-memory ... daxctl destroy ... You can't destroy and have it offline the memory for you in one go IIRC. Maybe that's the ACTUAL fix here? ~Gregory