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

Avi Kivity
2010-04-14T10:33:57Z

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?

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error compiling committee.c: too many arguments to function