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[23.128.96.18]) by mx.google.com with ESMTP id m19si17871370edj.511.2021.06.22.05.16.44; Tue, 22 Jun 2021 05:17:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231193AbhFVMQC (ORCPT + 99 others); Tue, 22 Jun 2021 08:16:02 -0400 Received: from mga03.intel.com ([134.134.136.65]:42990 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230393AbhFVMQC (ORCPT ); Tue, 22 Jun 2021 08:16:02 -0400 IronPort-SDR: LNFC+oAL8kcGTiGOtcTgXmCs4D7fP/zikw+T+ZWb8t+mJwUzvcQwbifuuj/uhn6xkrgXpWe2Y3 nBBHOO4NRvQQ== X-IronPort-AV: E=McAfee;i="6200,9189,10022"; a="207082859" X-IronPort-AV: E=Sophos;i="5.83,291,1616482800"; d="scan'208";a="207082859" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2021 05:13:43 -0700 IronPort-SDR: 2q8rndz0OgRFICy+sJxWuNjnGQnohqH6aaCbLXovOrDnAwkMc7OZi8tSBAWnHbQ9UP10kfThb7 ACA0hobZGmcQ== X-IronPort-AV: E=Sophos;i="5.83,291,1616482800"; d="scan'208";a="639091304" Received: from rtrevino-mobl2.amr.corp.intel.com (HELO [10.209.73.69]) ([10.209.73.69]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2021 05:13:41 -0700 Subject: Re: [PATCH -V8 02/10] mm/numa: automatically generate node migration order To: "Huang, Ying" , Zi Yan Cc: Dave Hansen , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yang Shi , Michal Hocko , Wei Xu , David Rientjes , Dan Williams , David Hildenbrand , osalvador References: <20210618061537.434999-1-ying.huang@intel.com> <20210618061537.434999-3-ying.huang@intel.com> <79397FE3-4B08-4DE5-8468-C5CAE36A3E39@nvidia.com> <87v96anu6o.fsf@yhuang6-desk2.ccr.corp.intel.com> <2AA3D792-7F14-4297-8EDD-3B5A7B31AECA@nvidia.com> <87sg1an1je.fsf@yhuang6-desk2.ccr.corp.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <87sg1an1je.fsf@yhuang6-desk2.ccr.corp.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/21/21 6:14 PM, Huang, Ying wrote: >> In our P9+volta system, GPU memory is exposed as a NUMA node. >> For the GPU workloads with data size greater than GPU memory size, >> it will be very helpful to allow pages in GPU memory to be migrated/demoted >> to CPU memory. With your current assumption, GPU memory -> CPU memory >> demotion seems not possible, right? This should also apply to any >> system with a device memory exposed as a NUMA node and workloads running >> on the device and using CPU memory as a lower tier memory than the device >> memory. > Thanks a lot for your use case! It appears that the demotion path > specified by users is one possible way to satisfy your requirement. And > I think it's possible to enable that on top of this patchset. But we > still have no specific plan to work on that at least for now. In other words, patches to make adapt this to your use case would be most welcome!