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[216.228.121.65]) by mx.google.com with ESMTPS id e13si9437876ybp.164.2019.07.25.10.50.05 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Jul 2019 10:50:05 -0700 (PDT) Received-SPF: pass (google.com: domain of rcampbell@nvidia.com designates 216.228.121.65 as permitted sender) client-ip=216.228.121.65; Authentication-Results: mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=rI6tcfKj; spf=pass (google.com: domain of rcampbell@nvidia.com designates 216.228.121.65 as permitted sender) smtp.mailfrom=rcampbell@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 25 Jul 2019 10:50:01 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 25 Jul 2019 10:50:03 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 25 Jul 2019 10:50:03 -0700 Received: from rcampbell-dev.nvidia.com (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 25 Jul 2019 17:49:59 +0000 Subject: Re: [PATCH v3 1/3] mm: document zone device struct page field usage To: Jason Gunthorpe CC: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , John Hubbard , "Matthew Wilcox" , Vlastimil Babka , "Christoph Lameter" , Dave Hansen , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , "Kirill A . Shutemov" , Lai Jiangshan , Martin Schwidefsky , Pekka Enberg , Randy Dunlap , Andrey Ryabinin , Christoph Hellwig , Andrew Morton , Linus Torvalds References: <20190724232700.23327-1-rcampbell@nvidia.com> <20190724232700.23327-2-rcampbell@nvidia.com> <20190725012225.GB32003@mellanox.com> X-Nvconfidentiality: public From: Ralph Campbell Message-ID: <131f7c2d-704e-6f58-a330-e62d2ef5539e@nvidia.com> Date: Thu, 25 Jul 2019 10:49:59 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190725012225.GB32003@mellanox.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL104.nvidia.com (172.18.146.11) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1564077001; bh=oG7iW18JoTbi7qpLIpRxo4HqaxvkInQKbpTpVVtqeEU=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=rI6tcfKjR1LQ254m/IBmbYjmdPRO+O414xxVE9H4xpU4Cf8g4LrW5czg2J7R/E9UK IuCJmkMOGHg5UbU9py+N6/OsZqu0i3kxRiq72lxvyBAr4R/SRk3Ph9b4cPcj0+1LeQ HcTMy4xeIFVIAR/fE4ZXX5aJEY1rtnMNaOKBxofLLtl/zXXuVCCDs4bXhLpGBDLgQt jjmro4lglHz8GYKuKJiGVMABgSpyow5/WGddYIcOrx8yIJ0mqOfTMoW7AvMdQppRqc XVh3RCs98U6YxWpnWEHvzQGz1G2j+AT6dv7iCO4T/AZ4bzZCYxC97uD7qOLtgfVRr8 Xb1mVLma/E6qQ== 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 7/24/19 6:22 PM, Jason Gunthorpe wrote: > On Wed, Jul 24, 2019 at 04:26:58PM -0700, Ralph Campbell wrote: >> Struct page for ZONE_DEVICE private pages uses the page->mapping and >> and page->index fields while the source anonymous pages are migrated to >> device private memory. This is so rmap_walk() can find the page when >> migrating the ZONE_DEVICE private page back to system memory. >> ZONE_DEVICE pmem backed fsdax pages also use the page->mapping and >> page->index fields when files are mapped into a process address space. >> >> Add comments to struct page and remove the unused "_zd_pad_1" field >> to make this more clear. >> >> Signed-off-by: Ralph Campbell >> Reviewed-by: John Hubbard >> Cc: Matthew Wilcox >> Cc: Vlastimil Babka >> Cc: Christoph Lameter >> Cc: Dave Hansen >> Cc: J=C3=A9r=C3=B4me Glisse >> Cc: "Kirill A . Shutemov" >> Cc: Lai Jiangshan >> Cc: Martin Schwidefsky >> Cc: Pekka Enberg >> Cc: Randy Dunlap >> Cc: Andrey Ryabinin >> Cc: Christoph Hellwig >> Cc: Jason Gunthorpe >> Cc: Andrew Morton >> Cc: Linus Torvalds >> include/linux/mm_types.h | 11 ++++++++++- >> 1 file changed, 10 insertions(+), 1 deletion(-) >=20 > Ralph, you marked some of thes patches as mm/hmm, but I feel it is > best if Andrew takes them through the normal -mm path. >=20 > They don't touch hmm.c or mmu notifiers so I don't forsee conflicts, > and I don't feel comfortable to review this code. >=20 > Regards, > Jason >=20 Fine with me. I should have been clear in the cover letter which tree to target.