[PATCH] drm/vc4: add tracepoints for CL submissions

[Melissa Wen]

On 02/25, Maxime Ripard wrote:
> Hi Melissa,
> 
> On Tue, Feb 01, 2022 at 08:26:51PM -0100, Melissa Wen wrote:
> > Trace submit_cl_ioctl and related IRQs for CL submission and bin/render
> > jobs execution. It might be helpful to get a rendering timeline and
> > track job throttling.
> > 
> > Signed-off-by: Melissa Wen <mwen at igalia.com>
> 
> I'm not really sure what to do about this patch to be honest.
> 
> My understanding is that tracepoints are considered as userspace ABI,
> but I can't really judge whether your traces are good enough or if it's
> something that will bit us some time down the road.

Hi Maxime,

Thanks for taking a look at this patch.

So, I followed the same path of tracing CL submissions on v3d. I mean,
tracking submit_cl ioctl, points when a job (bin/render) starts it
execution, and irqs of completion (bin/render job). We used it to
examine job throttling when running Chromium and, therefore, in addition
to have the timeline of jobs execution, I show some data submitted in
the ioctl to make connections. I think these tracers might be useful for
some investigation in the future, but I'm also not sure if all data are
necessary to be displayed.

Melissa

> 
> Emma, Daniel, David, any insight?
> 
> Thanks,
> Maxime


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