Phoronix: An Open-Source Version Of NVIDIA's NVPerfKit Continues Coming

As part of the this year's Google Summer of Code, a returning Nouveau developer is working on open-source, reverse-engineered performance counters support for NVIDIA graphics hardware that's implemented within the Nouveau driver stack and exposed to user-space in a similar manner to NVIDIA's NvPerfKit...

http://www.phoronix.com/vr.php?view=MTcyNTc