Re: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest os statistics from host side

[Sheng Yang]

On Wednesday 14 April 2010 18:33:37 Avi Kivity wrote:
> On 04/14/2010 01:27 PM, Sheng Yang wrote:
> >> Yes, interesting to see what the latency is.  If it's reasonably short
> >> (and I expect it will be so), we can do the busy wait solution.
> >>
> >> If we have an NMI counter somewhere, we can simply wait until it
> >> changes.
> >
> > Good idea. Of course we have one(at least on x86). There is
> > irq_stat.irq__nmi_count for per cpu. :)
> 
> Okay, but kvm doesn't want to know about it.  How about a new arch
> function, invoke_nmi_sync(), that will trigger the NMI and wait for it?
> 
Sound reasonable. Would try it.

-- 
regards
Yang, Sheng
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