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[216.228.121.64]) by mx.google.com with ESMTPS id d62si19482525pfg.209.2019.03.27.10.48.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Mar 2019 10:48:26 -0700 (PDT) Received-SPF: pass (google.com: domain of ziy@nvidia.com designates 216.228.121.64 as permitted sender) client-ip=216.228.121.64; Authentication-Results: mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=X98tPKAj; spf=pass (google.com: domain of ziy@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mailfrom=ziy@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 27 Mar 2019 10:48:20 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Wed, 27 Mar 2019 10:48:26 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Wed, 27 Mar 2019 10:48:26 -0700 Received: from [10.8.0.10] (10.124.1.5) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 27 Mar 2019 17:48:25 +0000 From: Zi Yan To: Dave Hansen CC: Keith Busch , Yang Shi , , , , , , "Busch, Keith" , "Williams, Dan J" , "Wu, Fengguang" , "Du, Fan" , "Huang, Ying" , , Subject: Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node Date: Wed, 27 Mar 2019 10:48:24 -0700 X-Mailer: MailMate (1.12.4r5622) Message-ID: <33FCCD53-4A4D-4115-9AC3-6C35A300169F@nvidia.com> In-Reply-To: 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> MIME-Version: 1.0 X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL101.nvidia.com (172.20.187.10) Content-Type: multipart/signed; boundary="=_MailMate_DA82EAD0-1665-4A6E-B1C4-471399DCFEE3_="; micalg=pgp-sha1; protocol="application/pgp-signature" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1553708900; bh=3uC4woD28mUbj6hka+LT/3mMwTXJ9j6nWGLKp/z7ZUA=; h=X-PGP-Universal:From:To:CC:Subject:Date:X-Mailer:Message-ID: In-Reply-To:References:MIME-Version:X-Originating-IP: X-ClientProxiedBy:Content-Type; b=X98tPKAj4hWpv3TDBg8/pHxYNSMGqMi0/QaE8gplerWMfZSBIc5ZnYiexlpuTHm0o Gh8qlMZOGrJxuIQZ3EGawHq1OGSdGasO+R/gupi7qVvTIhjIl+p9dfY89xDP/sY+4c xGVQs5HisiJNKQN5WonEb10vr7v7TAKurUWE/CMSjtrZh7cY69nvcxrOfqAXURsXbx XZI0IzLMkN7sGzSybiFTccCD1qpfY2xYl0nHJ4vDv3GBYcg6ER3xLdFpKs8QeqkvaL PllnVqu5PE39ToT7MgShFrCpP1u9SxCgny8QpPf7jWiUCpCG3+CFGnNK+v9nzfOV6M ZoZToMd+wPGKA== 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: --=_MailMate_DA82EAD0-1665-4A6E-B1C4-471399DCFEE3_= Content-Type: text/plain; markup=markdown On 27 Mar 2019, at 10:05, Dave Hansen wrote: > On 3/27/19 10:00 AM, Zi Yan wrote: >> I ask this because I observe that migrating a list of pages can >> achieve higher throughput compared to migrating individual page. >> For example, migrating 512 4KB pages can achieve ~750MB/s >> throughput, whereas migrating one 4KB page might only achieve >> ~40MB/s throughput. The experiments were done on a two-socket >> machine with two Xeon E5-2650 v3 @ 2.30GHz across the QPI link. > > What kind of migration? > > If you're talking about doing sys_migrate_pages() one page at a time, > that's a world away from doing something inside of the kernel one page > at a time. For 40MB/s vs 750MB/s, they were using sys_migrate_pages(). Sorry about the confusion there. As I measure only the migrate_pages() in the kernel, the throughput becomes: migrating 4KB page: 0.312GB/s vs migrating 512 4KB pages: 0.854GB/s. They are still >2x difference. Furthermore, if we only consider the migrate_page_copy() in mm/migrate.c, which only calls copy_highpage() and migrate_page_states(), the throughput becomes: migrating 4KB page: 1.385GB/s vs migrating 512 4KB pages: 1.983GB/s. The gap is smaller, but migrating 512 4KB pages still achieves 40% more throughput. Do these numbers make sense to you? -- Best Regards, Yan Zi --=_MailMate_DA82EAD0-1665-4A6E-B1C4-471399DCFEE3_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAEBAgAtFiEEh7yFAW3gwjwQ4C9anbJR82th+ooFAlybt2gPHHppeUBudmlk aWEuY29tAAoJEJ2yUfNrYfqK2AIQAIRQiK8keuvId46x28T0mxfxbYEnY9JeawL+ A3wFyX7orcvpKhU34luIwqi1cidMS64yzUj6QImSMvHTbUJS94BAXUFXE3iEhvTo tJlB8OvVsB0y6rItgU0sNelNw0cjI5zl4/Z0950ljRGrFAB5eLSpadsXSkQRzF/n dUrea31T/Lw7nK1DQY0Zd3U7hIPXdB3N9And5zIm9L3SEC7dgIULYgfm6x09Q7fr 9ylKEFlXne3RPaBXbGkfBnS7GkqlLzpLMRfzIFvV1aVqOVS75IR6hYg/Jli+X4UL 5svPHFnaxnTEE74fkEIKpVYiZDot3wc1UjGc/EQ7TTC5ZOOtp9bZROoEGQKgraAs aRGB4yeLKac7LHD2sa0YI6mUtTl7mXscsSH1j7DM8LnX+svcZCk4lPpsW21DMYtA s8lg13dBs2Y4oIV5MC85McxTfJj2w39c7kpgUxkZH49hJnZA94YSETS3SvdYZr2j cT3uDMX6Kt/zQkWjcTZjiUp38ZNhg1NZtvrODf6SeVVXR+KSPxPp4rCd99MKDfT7 AiTlHYsE2dHa2JTp8CMZUw61RVpjjvy97C/uNiWTGquzKu69yvyD8ooCgeXtIi3b AYCxDjlEITvVG+CSfZBwj4eDdeBRcar20dQNss1ZYxNy2bSFwiDOH7HLx/NqOg4y 0Cm+F72l =Zvlc -----END PGP SIGNATURE----- --=_MailMate_DA82EAD0-1665-4A6E-B1C4-471399DCFEE3_=--