Re: [RFC] para virt interface of perf to support kvm guest osstatistics collection in guest os

[Peter Zijlstra]

On Wed, 2010-06-09 at 12:41 +0300, Avi Kivity wrote:
> 
> >> Disabling the watchdog is unfortunate.  Why is it necessary?
> >>      
> > perf always uses NMI, so we disable the nmi_watchdog when a perf_event is
> > set up in case they might have impact.
> >    
> 
> Ok.  Is that the case for the hardware pmus as well?  If so it might be 
> done in common code. 

The x86 hardware pmu implementation disables the lapic watchdog too, but
recent kernels come with a watchdog implementation on top of perf, the
old lapic one will be depricated.


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