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[192.55.52.93]) by mx.google.com with ESMTPS id u26si14713246pfh.15.2019.03.27.13.14.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Mar 2019 13:14:57 -0700 (PDT) Received-SPF: pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.93 as permitted sender) client-ip=192.55.52.93; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.93 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Mar 2019 13:14:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,277,1549958400"; d="scan'208";a="310937470" Received: from ray.jf.intel.com (HELO [10.7.201.126]) ([10.7.201.126]) by orsmga005.jf.intel.com with ESMTP; 27 Mar 2019 13:14:56 -0700 Subject: Re: [RFC PATCH 0/10] Another Approach to Use PMEM as NUMA Node To: Yang Shi , Dan Williams , Michal Hocko Cc: Mel Gorman , Rik van Riel , Johannes Weiner , Andrew Morton , Keith Busch , Fengguang Wu , "Du, Fan" , "Huang, Ying" , Linux MM , Linux Kernel Mailing List References: <1553316275-21985-1-git-send-email-yang.shi@linux.alibaba.com> <20190326135837.GP28406@dhcp22.suse.cz> <43a1a59d-dc4a-6159-2c78-e1faeb6e0e46@linux.alibaba.com> <20190326183731.GV28406@dhcp22.suse.cz> <20190327090100.GD11927@dhcp22.suse.cz> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit 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 3/27/19 11:59 AM, Yang Shi wrote: > In real production environment we don't know what kind of applications > would end up on PMEM (DRAM may be full, allocation fall back to PMEM) > then have unexpected performance degradation. I understand to have > mempolicy to choose to avoid it. But, there might be hundreds or > thousands of applications running on the machine, it sounds not that > feasible to me to have each single application set mempolicy to avoid it. Maybe not manually, but it's entirely possible to automate this. It would be trivial to get help from an orchestrator, or even systemd to get apps launched with a particular policy. Or, even a *shell* that launches apps to have a particular policy.