linux-kernel - Re: [RFC v4 2/8] cgroup: gpu: Add a cgroup controller for allocator attribution of GPU memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CABdmKX2Gxg35k7QiL2Vn4zWhmQ4UnM-Z8cnOXR0fwBWyJnZ+Ng@mail.gmail.com>
Date:   Wed, 30 Mar 2022 13:56:09 -0700
From:   "T.J. Mercier" <tjmercier@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        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@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Kalesh Singh <kaleshsingh@...gle.com>, Kenny.Ho@....com,
        Michal Koutný <mkoutny@...e.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, cgroups@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [RFC v4 2/8] cgroup: gpu: Add a cgroup controller for allocator
 attribution of GPU memory

On Tue, Mar 29, 2022 at 9:59 AM Tejun Heo <tj@...nel.org> wrote:
>
> Hello,

I'm sorry for the delay Tejun, my test device stopped working and my
attention has been occupied with that.

>
> On Mon, Mar 28, 2022 at 03:59:41AM +0000, T.J. Mercier wrote:
> > The API/UAPI can be extended to set per-device/total allocation limits
> > in the future.
>
> This total thing kinda bothers me. Can you please provide some concrete
> examples of how this and per-device limits would be used?

The use case we have for accounting the total (separate from the
individual devices) is to include the value as part of bugreports, for
understanding the system-wide amount of dmabuf allocations. I'm not
aware of an existing need to limit the total. Admittedly this is just
the sum over the devices, but we currently maintain out of tree code
to do this sort of thing today. [1]

The per-device limits would be used to restrict the amount of each
type of allocation charged to an individual application to prevent
hogging or to completely prevent access. This limitation is not
something we have implemented today, but it is on our roadmap.

[1] https://android-review.googlesource.com/c/kernel/common/+/1566704/3/drivers/dma-buf/dma-heap.c

>
> Thanks.
>
> --
> tejun