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[209.85.220.65]) by mx.google.com with SMTPS id n11sor3321955qtc.28.2019.05.09.09.52.35 for (Google Transport Security); Thu, 09 May 2019 09:52:35 -0700 (PDT) Received-SPF: pass (google.com: domain of htejun@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=lZ76QuoW; spf=pass (google.com: domain of htejun@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=htejun@gmail.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=jUsBtZeNw5FNZWL8p+EHmLQcD3RYdpay6K7eQaM/McY=; b=lZ76QuoWP/RlQ75YXkOJcraYtkNTORpFzzVYzxh33URZ1VMjG3Xx5DjtZ3CHin9xa5 fS/xGH7+lJxkoHr7QwVmyDAjbeF7nvOmxv9beDILF+sB+8CiqCfnpouLazaG1HGm4wWr sSEbhOG5/jozTrc/fsmtxtN959XvvWOXy5liSIq+k6J+n2dlsbSH6ap+adywXTDR7kLx KiqF0AAJVljqXt6esw6EBUoQy090O3TR79BAiDBzt0e3J3KThFw2L3AVAsylb2+p2P5b a2N9dHCQk3vpX1jSLasmI3wCY61bPxdTWmHGDEdgCCrPI+I3gdezXTWfZ9jvSdaQw7fz mByg== X-Google-Smtp-Source: APXvYqx1t5kT+XXZFiBv+VqPqn8kVEYcdTa7Y4TE5pWMD/WmWnopKPh7/3rEKvsPEmRwg0IA9htZcQ== X-Received: by 2002:ac8:19f5:: with SMTP id s50mr4695898qtk.281.1557420754955; Thu, 09 May 2019 09:52:34 -0700 (PDT) Received: from localhost ([2620:10d:c091:500::1:c346]) by smtp.gmail.com with ESMTPSA id x47sm1527214qth.68.2019.05.09.09.52.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 May 2019 09:52:34 -0700 (PDT) Date: Thu, 9 May 2019 09:52:32 -0700 From: Tejun Heo To: "Welty, Brian" Cc: cgroups@vger.kernel.org, Li Zefan , Johannes Weiner , linux-mm@kvack.org, Michal Hocko , Vladimir Davydov , dri-devel@lists.freedesktop.org, David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, Christian =?iso-8859-1?Q?K=F6nig?= , =?iso-8859-1?B?Suly9G1l?= Glisse , RDMA mailing list , Leon Romanovsky , kenny.ho@amd.com Subject: Re: [RFC PATCH 0/5] cgroup support for GPU devices Message-ID: <20190509165232.GW374014@devbig004.ftw2.facebook.com> References: <20190501140438.9506-1-brian.welty@intel.com> <20190506152643.GL374014@devbig004.ftw2.facebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) 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: Hello, On Tue, May 07, 2019 at 12:50:50PM -0700, Welty, Brian wrote: > There might still be merit in having a 'device mem' cgroup controller. > The resource model at least is then no longer mixed up with host memory. > RDMA community seemed to have some interest in a common controller at > least for device memory aspects. > Thoughts on this? I believe could still reuse the 'struct mem_cgroup' data > structure. There should be some opportunity to reuse charging APIs and > have some nice integration with HMM for charging to device memory, depending > on backing store. Library-ish sharing is fine but in terms of interface, I think it'd be better to keep them separate at least for now. Down the line maybe these resources will interact with each other in a more integrated way but I don't think it's a good idea to try to design and implement resource models for something like that preemptively. Thanks. -- tejun