Re: Questing regarding KVM Guest PMU

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On Fri, Apr 06, 2012 at 10:43:17AM +0530, shashank rachamalla wrote:
> On Thu, Apr 5, 2012 at 8:11 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote:
> > On Thu, Apr 05, 2012 at 05:38:40PM +0300, Avi Kivity wrote:
> >> On 04/05/2012 04:57 PM, Gleb Natapov wrote:
> >> > > >
> >> > > May be it used NMI based profiling. We should ask oprofile developers.
> >> > > As I said I am almost sure my inability to run it on a host is probably
> >> > > PEBKAC, although I ran the same script exactly on the host and the
> >> > > guest (the script is from the first email of this thread)
> >> > >
> >> > After upgrading the kernel to latest git from whatever it was there the
> >> > same script works and counts CPU_CLK_UNHALT events.
> >> >
> >>
> >> This is even while it violates the Intel guidelines?
> >>
> > Yes, but who says the result is correct :) It seems that we handle
> > global ctrl msr wrong. That is counter can be enabled either in global
> > ctrl or in eventsel. Trying to confirm that.
> >
> if that becomes true then will global ctrl msr have any significance ?
When it is in use yes.

--
			Gleb.
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