From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f49.google.com (mail-qv1-f49.google.com [209.85.219.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C07D233A9DD for ; Tue, 6 Jan 2026 19:59:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767729599; cv=none; b=KMbTYX0C0w9+KNbO1y35L4ZI7mWt8CqD1a6NcgVJH4EEMD+c8p2WfXCt+QaYXm1txzlJoa32A3wf92Xmbg7kiijmF6bOFXnglcENqmouAL2dAwc7mCjQPKL+WpiO6T4HTXcXUSQJg42xl47RAjv6ZWauH/AjfA4tVg90+t45bmo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767729599; c=relaxed/simple; bh=/jlqDymDu0/oVq3SccafLBeTl9Jrelegy6Ywcr5+G58=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aXySCWyLbfhYH2zKAgL2zueKSRuiEIFINGiatc8s20eAnl3JM6O5c0BieA74PW59miYovLUzStkfp6e4A27KwxyXOp+XXynVJaYyfqlKOGXg4biRduMUMMK2D6/98g7EUbGlfS3uJew9OjweWLNdelkguHVRjZAnfAqz/ouiCbo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net; spf=pass smtp.mailfrom=gourry.net; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b=fx0C81tn; arc=none smtp.client-ip=209.85.219.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gourry.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b="fx0C81tn" Received: by mail-qv1-f49.google.com with SMTP id 6a1803df08f44-88ffcb14e11so14239696d6.0 for ; Tue, 06 Jan 2026 11:59:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gourry.net; s=google; t=1767729596; x=1768334396; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=BWpz+GfQini7oDjFufcaLNIyvW0LJEPJ4NqJCF4ChR4=; b=fx0C81tnGYWz9BVFClThIlgC/smOtP+j2xyahMTA7KgqAP1Hpv5el1kx81fDpVIgln h/mYlYF2j4t2EmkTV357tn2IErXj2GnowfTR+pK0d0Qk0HT7EHBLJkX8WaKqY6IFYXkv NSb64r93dYJ7B4ctXxPxQ0Bjxn6TZsPY4MVUH0KMHvoxbUgaPlUF0wBzYn6C0X17k6Ot yAS/QRzKSWlW5ylVkbGn50fwmWTGuLPoLsmdN2qwfnbGqHPl0PLUu9lB0iIW2S+GiYSy V6ssAymgTY/Ht4Htaol3ayhbENvk0N7fhycfRclpYkbZo182BQLfpRHYk5YnWI5H4pLa nInw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767729596; x=1768334396; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=BWpz+GfQini7oDjFufcaLNIyvW0LJEPJ4NqJCF4ChR4=; b=JbC474NKPFHf9GMoZIdiJE1pfHOLMnoG4PYd5uzV/FSm0MiBGJGIXd7BTUP4LD2Wuh SY/4B83iWjW8O46shzqvh1pFL23VP+oQBTr0tr4KWL38tOJQd3Pl0RQI63QQKq8qMeoY Oc/LwNgqrMg0L3BDAN3Wpouukdh08RYdpIJXoKYhOL3QGGEGV1b7Bh/lPlcNyidqXp5g P4TEVV/gbMbwgw3pv+B4PlRFgoDDw6QtWfJb5xwpjJ6Dg7+O5CR4NUU0IrJ5hJwFSdd3 u5m0NGO+iqjpfwOMPR0Bsb3E4T/sVWFXhpcyVU1SL+X7LlKPuE6h+qdrbHN4Z5X8ppqj 7i5w== X-Forwarded-Encrypted: i=1; AJvYcCV9jUFqB+GH6TeHKRcIYpU9W3n725moz2nWQmxvof9i8JdngQEOFExYXE2wQj3yEMIvpt2U+2VxWjXPA2A=@vger.kernel.org X-Gm-Message-State: AOJu0Yyz9gg7zAaYe0jtvGDrX13ziE89Nvtog6sXcUAu/MUUva6icyX+ h9QzbbZhhJnOcaUYDnQPiLUAuxzkSBgiIWgBkJIB3HVh7Z8q5Delvz0963rqMa9jQ2U= X-Gm-Gg: AY/fxX7PIEtHk+C663JSBsPGs1pbLczhp3RMEhpbEwbukTisoslmjMs4vXxSuDgd08c 99odDOXENWMpGt26/hnpNygLE2z9r6LQK2GtlrO0msmO8LwNMRBlL+fxGqFpQoLvvSNg97KlN/W rnN9NMujfjAoHi8f7EOlpf9yAjhT994dLbSuWOB6b3giD6TpnTp1bKZWo1wM+u28QJhdN2H0E/b hEX3reZ6w4rZR7fg1D+QnRcWo13cp5pbc0CQerECrCv6LyC4ZbOPHW9UfqUMkxCCjBdo1b8zsJ6 kjQx+TvKMe8FqOCaL/s66rVSQ4SDqK+jmWt1LJjFdi/x4RAaz3CmYvWthICxFnvp7+Wp5aVSc2O MRD81NUwEW1hGKQE8t3ePqRJ84F1k2pGMdT5VJpL9t5zFRULI0njQXt9JcWXT27rHylBOM8+fon 0vXEI2ei3xyfEIwA3htndfgpz6Dnhjb1bDbihOo++W/E2sGZAHbOBFw8/8bhdqI9H5OBE1sw== X-Google-Smtp-Source: AGHT+IH0pDZX0kEZDbgkinL5VI9nQJeDZHAvbz2W5LdZr1hgU13QOB2KrppALh+k9k7U8WBwPbQhHw== X-Received: by 2002:a05:6214:4992:b0:880:57dd:5f15 with SMTP id 6a1803df08f44-890842755e5mr1974186d6.54.1767729596630; Tue, 06 Jan 2026 11:59:56 -0800 (PST) Received: from gourry-fedora-PF4VCD3F (pool-96-255-20-138.washdc.ftas.verizon.net. [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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <616f97b7-24e0-4134-a08d-5abaf07a8b09@kernel.org> 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