https://bugs.kde.org/show_bug.cgi?id=444042
--- Comment #2 from Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com> ---
Yes CAP_PERFMON is required for global stats and then you could either get the
data directly using perf_event_open(2) or going through intel_gpu_top. If you
go for latter then note it has a JSON output mode which may be handy.
Personally I prefer direct/light-weight solutions but it would be up to you.
Regarding per client usage and amdgpu, yes, it is exporting this data since
commit 874442541133 ("drm/amdgpu: Add show_fdinfo() interface") (kernel 5.14 I
believe). My proposal is to standardise the exported fields there, or at least
allow for documenting at a single place. Because at the moment it does not look
that i915 and amdgpu would be exporting the exact same format (ns vs % over
integration time), but as long as vendors commit to interface stability it
should be workable for userspace.
I would be very happy to support you with kernel patches to use for developing
the prototype. And also with patches to intel_gpu_top which kind of shows how
to read and interpret the data.
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