* Perf support
@ 2013-03-16 18:03 John Nelson
0 siblings, 0 replies; 2+ messages in thread
From: John Nelson @ 2013-03-16 18:03 UTC (permalink / raw)
To: xen-devel
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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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* Re: Perf support
@ 2013-03-17 3:48 Boris Ostrovsky
0 siblings, 0 replies; 2+ messages in thread
From: Boris Ostrovsky @ 2013-03-17 3:48 UTC (permalink / raw)
To: john.l.nelson; +Cc: xen-devel
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----- john.l.nelson@gmail.com wrote:
>
>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?
HVM guests should support perf with HW counters but this won't work on PV guests (including dom0) at this time.
-boris
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