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Thu, 23 Feb 2023 10:22:12 -0800 (PST) Received: from localhost ([2620:10d:c090:400::5:e5b4]) by smtp.gmail.com with ESMTPSA id c19-20020aa78813000000b005a817973a81sm4930867pfo.43.2023.02.23.10.22.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Feb 2023 10:22:11 -0800 (PST) Date: Thu, 23 Feb 2023 08:22:09 -1000 From: Tejun Heo To: Jason Gunthorpe Cc: Yosry Ahmed , "T.J. Mercier" , Alistair Popple , Michal Hocko , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, jhubbard@nvidia.com, hannes@cmpxchg.org, surenb@google.com, mkoutny@suse.com, daniel@ffwll.ch, "Daniel P . Berrange" , Alex Williamson , Zefan Li , Andrew Morton Subject: Re: [PATCH 14/19] mm: Introduce a cgroup for pinned memory Message-ID: References: <87o7pmnd0p.fsf@nvidia.com> <87k009nvnr.fsf@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 9CC98100004 X-Stat-Signature: bm31ro7ebbwxgx5sdu3ke48ocurbk6h1 X-HE-Tag: 1677176533-833195 X-HE-Meta: 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 MuP44dIk 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 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 Thu, Feb 23, 2023 at 02:17:18PM -0400, Jason Gunthorpe wrote: > On Thu, Feb 23, 2023 at 08:15:17AM -1000, Tejun Heo wrote: > > On Thu, Feb 23, 2023 at 02:10:56PM -0400, Jason Gunthorpe wrote: > > > > I am not familiar with memfd, but based on > > > > mem_cgroup_swapin_charge_folio() it seems like if cgroup B swapped in > > > > the pages they will remain charged to cgroup A, unless cgroup A is > > > > removed/offlined. Am I missing something? > > > > > > Ah, I don't know, Tejun said: > > > > > > "but it can converge when page usage transfers across cgroups > > > if needed." > > > > > > Which I assumed was swap related but I don't know how convergence > > > works. > > > > That'd work for pagecache. For swap-backed, I think Yosry is right. Is > > MAP_SHARED | MAP_ANONYMOUS a concern? Such mappings can only be shared > > through forking, so it's not a common thing to be shared across different > > resource domains. > > Isn't memfd also in the same boat? I see. Yeah, that's looks like named shared anon. The first one instantiating a page would always be the owner. Thanks. -- tejun