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[142.162.115.133]) by smtp.gmail.com with ESMTPSA id i17sm1366425qtg.77.2020.12.14.05.36.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Dec 2020 05:36:04 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1koo1D-00AHmi-4n; Mon, 14 Dec 2020 09:36:03 -0400 Date: Mon, 14 Dec 2020 09:36:03 -0400 From: Jason Gunthorpe To: David Hildenbrand Cc: Pavel Tatashin , LKML , linux-mm , Andrew Morton , Vlastimil Babka , Michal Hocko , Oscar Salvador , Dan Williams , Sasha Levin , Tyler Hicks , Joonsoo Kim , mike.kravetz@oracle.com, Steven Rostedt , Ingo Molnar , Peter Zijlstra , Mel Gorman , Matthew Wilcox , David Rientjes , John Hubbard , Linux Doc Mailing List Subject: Re: [PATCH v3 5/6] mm/gup: migrate pinned pages out of movable zone Message-ID: <20201214133603.GF5487@ziepe.ca> References: <20201211235005.GE5487@ziepe.ca> <2D10D596-3159-483C-81B4-CD187806ED46@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <2D10D596-3159-483C-81B4-CD187806ED46@redhat.com> Content-Transfer-Encoding: quoted-printable 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 Sat, Dec 12, 2020 at 08:29:11AM +0100, David Hildenbrand wrote: > > Racing with another GUP in another thread is also not reasonable, so > > failing to isolate can't be a failure >=20 > Having VMs with multiple vfio containers is certainly realistic, and > optimizing in user space to do vfio mappings concurrently doesn=E2=80=98= t > sound too crazy to me. But I haven=E2=80=98t checked if vfio common cod= e > already handles such concurrency. There is a lot more out there than vfio.. RDMA already does concurrent pin_user_pages in real apps Jason