[Lima] Can I read GPU usage with Streamline(DS-5) on Lima driver?

[Qiang Yu]

Maybe devfreq can be used for a rough utilization number. lima devfreq
collect GPU utilization for
power saving, so we may use the info from
/sys/class/devfreq/.../trans_stat for this:
S=0
for(i = 0...num_freq) S += T[i] * F[i]
R = S / (Ttotal * Fmax)
T[i] is time used on frequency F[i]

On Tue, Jun 7, 2022 at 4:39 PM Erico Nunes <nunes.erico at gmail.com> wrote:
>
> Hello,
>
> On Tue, Jun 7, 2022 at 5:21 AM 조영준 (YoungJun Jo) <youngjun at telechips.com> wrote:
> > I am preparing to migrate Mali-400 GPU device driver to Lima driver. One important point for me here is, can I use the Streamline (DS-5 CE) tool I've been using in Lima to check the GPU usage in the same way?
>
> No, not with Streamline.
>
> > So my guess is that if I change the device driver to Lima, I won't be able to check GPU usage with Streamline anymore, right? If yes, How can I check Lima's real-time GPU usage?
>
> GALLIUM_HUD works for the simplest cases.
>
> As Vasily pointed out, for the performance counters there is this MR
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6077 and
> associated kernel patch.
> It uses a different approach as it exposes
> https://www.khronos.org/registry/OpenGL/extensions/AMD/AMD_performance_monitor.txt
> apitrace is a tool that implements the extension, so that is an option
> to use with traces. To use it with anything else, that application
> would also need to implement the AMD_performance_monitor extension
> (which unfortunately is not very common).
>
> The MR is stalled mostly because on the kernel side it needs a better
> solution for the submit struct, as pointed out in
> https://gitlab.freedesktop.org/enunes/linux/-/commit/2a5d90ac4f4c97b7e25f94497398794d5f0206f4#note_581894
> . But I never really continued that work since then.
>
> Erico