quoted

In addition we could also add a --topdown arg to force using JSON 
metricgroups.

What arg do think would be supplied?

something like -json or -metricgroup, meaning "Use pmu-events metric 
events to calculate topdown results rather than kernel CPU PMU events. 
This is default fallback if the kernel CPU PMU does not support topdown 
events"

quoted

Did you actually test this patch? I have something experimental 
working from some time ago, and it was more complicated than this. I 
need to check the code again...

I got stats back from this implementation, yes.  Let me know if there's 
things my patch isn't catering for.

I'll give it a spin...

Thanks,
John

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