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AFAIK, radeon doesn't support performance counters at the moment.
You can see the current GPU clocks and voltages via debugfs:
Note that the clocks are in 10Khz units.
Thank you for your response!
I checked out radeontop and it woks well with Kaveri. This kind of information is quite enough for me.
For radeontop I pulled it from git and built by myself, the version you get with apt-get install does not work.
A small reference if you will build it:
then you can proceed with build.
For the cat /sys/kernel/debug/dri/64/radeon_pm_info - it gives the GPU clocks, no wrongs.