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Mon, 14 Dec 2020 14:21:27 +0000 (UTC) Received: from [10.36.114.184] (ovpn-114-184.ams2.redhat.com [10.36.114.184]) by smtp.corp.redhat.com (Postfix) with ESMTP id D197018F0A; Mon, 14 Dec 2020 14:21:22 +0000 (UTC) Subject: Re: [PATCH v3 5/6] mm/gup: migrate pinned pages out of movable zone To: Jason Gunthorpe 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 References: <20201211235005.GE5487@ziepe.ca> <2D10D596-3159-483C-81B4-CD187806ED46@redhat.com> <20201214133603.GF5487@ziepe.ca> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <69beec6b-8518-aa47-5a08-fd5f85cf9430@redhat.com> Date: Mon, 14 Dec 2020 15:21:21 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201214133603.GF5487@ziepe.ca> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 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 14.12.20 14:36, Jason Gunthorpe wrote: > On Sat, Dec 12, 2020 at 08:29:11AM +0100, David Hildenbrand wrote: >=20 >>> Racing with another GUP in another thread is also not reasonable, so >>> failing to isolate can't be a failure >> >> 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 co= de >> already handles such concurrency. >=20 > There is a lot more out there than vfio.. RDMA already does concurrent > pin_user_pages in real apps I actually misread your comment. I think we both agree that temporary isolation failures must not lead to a failure. --=20 Thanks, David / dhildenb