I wanna have a standardised GPU profiling extension. Vendor independent.
On the CPU you can do nice profiling of your application with rdtsc but for the GPU? No chance to profile your GPU without destroying parallelism.
It shouldn't be too hard to provide hardware/driver support for an asynchronous performance query.
On directx you already have something like NVPerfHUD. Please provide for OpenGL a vendor independent extension to query some usefull performance data.