linux-kernel - Re: [PATCH v7 0/6] Proposal for a GPU cgroup controller

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Message-ID: <YodHjYlMx1XGtM2+@slm.duckdns.org>
Date:   Thu, 19 May 2022 21:47:25 -1000
From:   Tejun Heo <tj@...nel.org>
To:     "T.J. Mercier" <tjmercier@...gle.com>
Cc:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <brauner@...nel.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        Shuah Khan <shuah@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
        John Stultz <jstultz@...gle.com>,
        Carlos Llamas <cmllamas@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>, Kenny.Ho@....com,
        Michal Koutný <mkoutny@...e.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        kernel-team@...roid.com, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v7 0/6] Proposal for a GPU cgroup controller

Hello,

On Tue, May 17, 2022 at 04:30:29PM -0700, T.J. Mercier wrote:
> Thanks for your suggestion. This almost works. "dmabuf" as a key could
> work, but I'd actually like to account for each heap. Since heaps can
> be dynamically added, I can't accommodate every potential heap name by
> hardcoding registrations in the misc controller.

On its own, that's a pretty weak reason to be adding a separate gpu
controller especially given that it doesn't really seem to be one with
proper abstractions for gpu resources. We don't want to keep adding random
keys to misc controller but can definitely add limited flexibility. What
kind of keys do you need?

Thanks.

-- 
tejun