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[195.135.220.15]) by mx.google.com with ESMTPS id d15si4053585edb.99.2019.04.24.23.37.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Apr 2019 23:37:28 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5232FAE5E; Thu, 25 Apr 2019 06:37:28 +0000 (UTC) Date: Thu, 25 Apr 2019 08:37:27 +0200 From: Michal Hocko To: Fan Du Cc: akpm@linux-foundation.org, fengguang.wu@intel.com, dan.j.williams@intel.com, dave.hansen@intel.com, xishi.qiuxishi@alibaba-inc.com, ying.huang@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 0/5] New fallback workflow for heterogeneous memory system Message-ID: <20190425063727.GJ12751@dhcp22.suse.cz> References: <1556155295-77723-1-git-send-email-fan.du@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1556155295-77723-1-git-send-email-fan.du@intel.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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: On Thu 25-04-19 09:21:30, Fan Du wrote: [...] > However PMEM has different characteristics from DRAM, > the more reasonable or desirable fallback style would be: > DRAM node 0 -> DRAM node 1 -> PMEM node 2 -> PMEM node 3. > When DRAM is exhausted, try PMEM then. Why and who does care? NUMA is fundamentally about memory nodes with different access characteristics so why is PMEM any special? -- Michal Hocko SUSE Labs