Re: KVM PMU virtualization

Peter Zijlstra
2010-02-26T15:18:54Z

On Fri, 2010-02-26 at 17:11 +0200, Avi Kivity wrote:
> On 02/26/2010 05:08 PM, Peter Zijlstra wrote:
> >> That's 7 more than what we support now, and 7 more than what we can
> >> guarantee without it.
> >>
> > Again, what windows software uses only those 7? Does it pay to only have
> > access to those 7 or does it limit the usability to exactly the same
> > subset a paravirt interface would?
> >
>
> Good question. Would be interesting to try out VTune with the non-arch
> pmu masked out.

>From what I understood VTune uses PEBS+LBR, although I suppose they have
simple PMU modes too, never actually seen the software.