linux-kernel - Re: [RFC 0/3] drm: Add comm/cmdline fdinfo fields

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Message-ID: <CAF6AEGumgsJJQXojapPAJOjmFo=MZ31DNmp9T+SErQ2GBKBLFg@mail.gmail.com>
Date:   Mon, 17 Apr 2023 13:45:08 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Rob Clark <robdclark@...omium.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Sean Paul <sean@...rly.run>
Subject: Re: [RFC 0/3] drm: Add comm/cmdline fdinfo fields

On Mon, Apr 17, 2023 at 1:12 PM Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> When many of the things using the GPU are processes in a VM guest, the
> actual client process is just a proxy.  The msm driver has a way to let
> the proxy tell the kernel the actual VM client process's executable name
> and command-line, which has until now been used simply for GPU crash
> devcore dumps.  Lets also expose this via fdinfo so that tools can
> expose who the actual user of the GPU is.

I should have also mentioned, in the VM/proxy scenario we have a
single process with separate drm_file's for each guest VM process.  So
it isn't an option to just change the proxy process's name to match
the client.

> Rob Clark (3):
>   drm/doc: Relax fdinfo string constraints
>   drm/msm: Rework get_comm_cmdline() helper
>   drm/msm: Add comm/cmdline fields
>
>  Documentation/gpu/drm-usage-stats.rst   | 37 +++++++++++++++----------
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c |  4 +--
>  drivers/gpu/drm/msm/msm_drv.c           |  2 ++
>  drivers/gpu/drm/msm/msm_gpu.c           | 27 +++++++++++++-----
>  drivers/gpu/drm/msm/msm_gpu.h           | 12 ++++++--
>  drivers/gpu/drm/msm/msm_submitqueue.c   |  1 +
>  6 files changed, 58 insertions(+), 25 deletions(-)
>
> --
> 2.39.2
>