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[54.240.9.92]) by mx.google.com with ESMTPS id t25si332290qtb.354.2019.03.19.18.01.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 19 Mar 2019 18:01:07 -0700 (PDT) Received-SPF: pass (google.com: domain of 01000169989db656-8868a4b2-a8eb-4666-872f-2ed9885c99e6-000000@amazonses.com designates 54.240.9.92 as permitted sender) client-ip=54.240.9.92; Authentication-Results: mx.google.com; dkim=pass header.i=@amazonses.com header.s=6gbrjpgwjskckoa6a5zn6fwqkn67xbtw header.b=YjBUampI; spf=pass (google.com: domain of 01000169989db656-8868a4b2-a8eb-4666-872f-2ed9885c99e6-000000@amazonses.com designates 54.240.9.92 as permitted sender) smtp.mailfrom=01000169989db656-8868a4b2-a8eb-4666-872f-2ed9885c99e6-000000@amazonses.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=6gbrjpgwjskckoa6a5zn6fwqkn67xbtw; d=amazonses.com; t=1553043666; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:MIME-Version:Content-Type:Feedback-ID; bh=Qm0r/S4Ne4XTZAHDLismxE9m3x/wdarSZ1AUHvBMnnQ=; b=YjBUampIgq93H7NdpjoHwlbka+MNSa7HfbivjdfJz2BjHertUJNb19GG8bNMjG+N iF35ywDLZrnkqgecUxB12DQFn/81gops112YhDaaLzDBYIwTlS8+I+gs1fhkLMhugh0 f8t9ZHIseriw4WNyToiVQfCpkHirywg0aSE2ezwA= Date: Wed, 20 Mar 2019 01:01:06 +0000 From: Christopher Lameter X-X-Sender: cl@nuc-kabylake To: Dave Chinner cc: Jerome Glisse , "Kirill A. Shutemov" , john.hubbard@gmail.com, Andrew Morton , linux-mm@kvack.org, Al Viro , Christian Benvenuti , Christoph Hellwig , Dan Williams , Dennis Dalessandro , Doug Ledford , Ira Weiny , Jan Kara , Jason Gunthorpe , Matthew Wilcox , Michal Hocko , Mike Rapoport , Mike Marciniszyn , Ralph Campbell , Tom Talpey , LKML , linux-fsdevel@vger.kernel.org, John Hubbard , Andrea Arcangeli Subject: Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions In-Reply-To: <20190319235752.GB26298@dastard> Message-ID: <01000169989db656-8868a4b2-a8eb-4666-872f-2ed9885c99e6-000000@email.amazonses.com> References: <20190308213633.28978-1-jhubbard@nvidia.com> <20190308213633.28978-2-jhubbard@nvidia.com> <20190319120417.yzormwjhaeuu7jpp@kshutemo-mobl1> <20190319134724.GB3437@redhat.com> <20190319141416.GA3879@redhat.com> <20190319212346.GA26298@dastard> <20190319220654.GC3096@redhat.com> <20190319235752.GB26298@dastard> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-SES-Outgoing: 2019.03.20-54.240.9.92 Feedback-ID: 1.us-east-1.fQZZZ0Xtj2+TD7V5apTT/NrT6QKuPgzCT/IC7XYgDKI=:AmazonSES 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 Wed, 20 Mar 2019, Dave Chinner wrote: > So the plan for GUP vs writeback so far is "break fsync()"? :) Well if its an anonymous page and not a file backed page then the semantics are preserved. Disallow GUP long term pinning (marking stuff like in this patchset may make that possible) and its clean.