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27 Mar 2019 13:42:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,277,1549958400"; d="scan'208";a="310944366" 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 13:42:51 -0700 Subject: Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node To: Zi Yan Cc: Keith Busch , Yang Shi , mhocko@suse.com, mgorman@techsingularity.net, riel@surriel.com, hannes@cmpxchg.org, akpm@linux-foundation.org, "Busch, Keith" , "Williams, Dan J" , "Wu, Fengguang" , "Du, Fan" , "Huang, Ying" , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1553316275-21985-1-git-send-email-yang.shi@linux.alibaba.com> <1553316275-21985-7-git-send-email-yang.shi@linux.alibaba.com> <20190324222040.GE31194@localhost.localdomain> <20190327003541.GE4328@localhost.localdomain> <39d8fb56-df60-9382-9b47-59081d823c3c@linux.alibaba.com> <20190327130822.GD7389@localhost.localdomain> <2C32F713-2156-4B58-B5C1-789C1821EBB9@nvidia.com> <33FCCD53-4A4D-4115-9AC3-6C35A300169F@nvidia.com> <3fd20a95-7f2d-f395-73f6-21561eae9912@intel.com> <6A903D34-A293-4056-B135-6FA227DE1828@nvidia.com> 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: <6A903D34-A293-4056-B135-6FA227DE1828@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/27/19 1:37 PM, Zi Yan wrote: > Actually, the migration throughput difference does not come from > any kernel changes, it is a pure comparison between > migrate_pages(single 4KB page) and migrate_pages(a list of 4KB > pages). The point I wanted to make is that Yang’s approach, which > migrates a list of pages at the end of shrink_page_list(), can > achieve higher throughput than Keith’s approach, which migrates one > page at a time in the while loop inside shrink_page_list(). I look forward to seeing the patches.