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SubjectRe: [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events
On 01/16/2012 06:11 PM, Avi Kivity wrote:


>> Total Samples:975981, Total events handled time:126502464.88us.
>
> Nice! If we can have a live version as well, this can replace kvm_stat.
>
> The average numbers are really high. Like a factor of 3x-4x off. Would
> be good to print the standard deviation and see why. Maybe it's due to
> the tracing overhead.
>


It is a good suggestion, i will print stddev in the next version.

>> The default event to be analysed is vmexit, we can use --event to specify it,
>> for example, if we want to trace mmio event:
>> # ./perf kvm-events report --event mmio
>> Warning: Error: expected type 5 but read 4
>> Warning: Error: expected type 5 but read 0
>> Warning: unknown op '}'
>>
>>
>> Analyze events for all VCPUs:
>>
>> MMIO Access Samples Samples% Time% Avg time
>>
>> 0xfee00380:W 196589 64.95% 70.01% 3.83us
>> 0xfee00310:W 35356 11.68% 6.48% 1.97us
>> 0xfee00300:W 35356 11.68% 16.37% 4.97us
>> 0xfee00300:R 35356 11.68% 7.14% 2.17us
>
> These are more reasonable (though still high - 5us for an ICR write?)
>


Hmm, maybe i need look into it...

>> Total Samples:975981, Total events handled time:126502464.88us.
>>
>> I hope guys will like it and any comments are welcome! :)
>
> I think it's great! A live version would be a nice addition too.
>
> Please copy the perf userspace maintainers to get more detailed review
> in the next version.
>


Okay, Thanks!



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