[Xen-devel] Perf support

[John Nelson <john.l.nelson@xxxxxxxxx>]

I am a member of the PAPI team (http://icl.cs.utk.edu/papi/). We are interested in supporting performance counters in xen. It would appear from a few threads in 2012 that xen should support counter access using perf (which is what our tool uses). However, I have not been able to successfully get any results in Dom0 or DomU. I am getting the error in dmesg:

Performance Events: unsupported p6 CPU model 42 no PMU driver,
software events only.

Does this necessarily mean that this CPU will not support PMU at all? Are there any other specific steps I need to take other than including vpmu flag to enable virtual PMU support?

-John

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