Official performance profiling support for NVIDIA's linux graphics driver

I think NVIDIA Perfkit is one of the important tools for software developers;
however, its latest version doesn’t support linux environment.

Does NVIDIA have any plan to release linux version?

If not, I wish NVIDIA will help people who are trying the
reverse-engineering of GPU’s performance counters,
e.g., http://www.phoronix.com/scan.php?page=news_item&px=MTY5MzM

For example, if NVIDIA provides some specifications about performance
counters, i think “perf” framework of linux kernel will easily support
it. It would be useful alternative tool of NVIDIA Perfkit.