linux-kernel - Re: [RFC v2 0/6] Proposal for a GPU cgroup controller

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Date:   Fri, 18 Feb 2022 11:12:44 -0800
From:   "T.J. Mercier" <tjmercier@...gle.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        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>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     Kalesh Singh <kaleshsingh@...gle.com>, Kenny.Ho@....com,
        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
Subject: Re: [RFC v2 0/6] Proposal for a GPU cgroup controller

On Fri, Feb 11, 2022 at 8:18 AM T.J. Mercier <tjmercier@...gle.com> wrote:
>
> This patch series revisits the proposal for a GPU cgroup controller to
> track and limit memory allocations by various device/allocator
> subsystems. The patch series also contains a simple prototype to
> illustrate how Android intends to implement DMA-BUF allocator
> attribution using the GPU cgroup controller. The prototype does not
> include resource limit enforcements.
>
> Changelog:
>
> v2:
> See the previous revision of this change submitted by Hridya Valsaraju
> at: https://lore.kernel.org/all/20220115010622.3185921-1-hridya@google.com/
>
> Move dma-buf cgroup charge transfer from a dma_buf_op defined by every
> heap to a single dma-buf function for all heaps per Daniel Vetter and
> Christian König. Pointers to struct gpucg and struct gpucg_device
> tracking the current associations were added to the dma_buf struct to
> achieve this.
>
> Fix incorrect Kconfig help section indentation per Randy Dunlap.
>
> History of the GPU cgroup controller
> ====================================
> The GPU/DRM cgroup controller came into being when a consensus[1]
> was reached that the resources it tracked were unsuitable to be integrated
> into memcg. Originally, the proposed controller was specific to the DRM
> subsystem and was intended to track GEM buffers and GPU-specific
> resources[2]. In order to help establish a unified memory accounting model
> for all GPU and all related subsystems, Daniel Vetter put forth a
> suggestion to move it out of the DRM subsystem so that it can be used by
> other DMA-BUF exporters as well[3]. This RFC proposes an interface that
> does the same.
>
> [1]: https://patchwork.kernel.org/project/dri-devel/cover/20190501140438.9506-1-brian.welty@intel.com/#22624705
> [2]: https://lore.kernel.org/amd-gfx/20210126214626.16260-1-brian.welty@intel.com/
> [3]: https://lore.kernel.org/amd-gfx/YCVOl8%2F87bqRSQei@phenom.ffwll.local/
>
> T.J. Mercier (6):
>   gpu: rfc: Proposal for a GPU cgroup controller
>   cgroup: gpu: Add a cgroup controller for allocator attribution of GPU
>     memory
>   dmabuf: Use the GPU cgroup charge/uncharge APIs
>   dmabuf: heaps: export system_heap buffers with GPU cgroup charging
>   dmabuf: Add gpu cgroup charge transfer function
>   android: binder: Add a buffer flag to relinquish ownership of fds
>
>  Documentation/gpu/rfc/gpu-cgroup.rst | 195 +++++++++++++++++
>  Documentation/gpu/rfc/index.rst      |   4 +
>  drivers/android/binder.c             |  26 +++
>  drivers/dma-buf/dma-buf.c            | 100 +++++++++
>  drivers/dma-buf/dma-heap.c           |  27 +++
>  drivers/dma-buf/heaps/system_heap.c  |   3 +
>  include/linux/cgroup_gpu.h           | 127 +++++++++++
>  include/linux/cgroup_subsys.h        |   4 +
>  include/linux/dma-buf.h              |  22 +-
>  include/linux/dma-heap.h             |  11 +
>  include/uapi/linux/android/binder.h  |   1 +
>  init/Kconfig                         |   7 +
>  kernel/cgroup/Makefile               |   1 +
>  kernel/cgroup/gpu.c                  | 304 +++++++++++++++++++++++++++
>  14 files changed, 830 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/gpu/rfc/gpu-cgroup.rst
>  create mode 100644 include/linux/cgroup_gpu.h
>  create mode 100644 kernel/cgroup/gpu.c
>
> --
> 2.35.1.265.g69c8d7142f-goog
>

Gentle nudge to GPU maintainers to please provide their feedback on
this RFC. Thanks!