linux-kernel - Re: [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events

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Date:	Tue, 17 Jan 2012 10:41:00 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	David Ahern <dsahern@...il.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events

On 01/17/2012 06:53 AM, David Ahern wrote:

> 
> 
> On 01/16/2012 02:30 AM, Xiao Guangrong wrote:
>> This tool is very like xenoprof(if i remember correctly), and traces kvm events
>> smartly. currently, it supports vmexit/mmio/ioport events.
>>
>> Usage:
>> - to trace kvm events:
>> # ./perf kvm-events record
>>
>> - show the result
>> # ./perf kvm-events report
>>
>> Some output are as follow:
>> # ./perf kvm-events report
>>   Warning: Error: expected type 5 but read 4
>>   Warning: Error: expected type 5 but read 0
>>   Warning: unknown op '}'
> 
> Integrating the trace-cmd plugins into perf will remedy the above errors:
> https://lkml.org/lkml/2011/8/16/352
> 


Yes, it is great!

> Unfortunately, that effort is stalled at the moment.
> 
>>
>>
>> Analyze events for all VCPUs:
>>
>>              VM-EXIT    Samples      Samples%         Time%        Avg time
>>
>>          APIC_ACCESS     438107        44.89%         6.20%        17.91us
>>   EXTERNAL_INTERRUPT     219226        22.46%         8.01%        46.20us
>>       IO_INSTRUCTION     122651        12.57%         1.88%        19.44us
>>        EPT_VIOLATION      83110         8.52%         1.36%        20.75us
>>    PENDING_INTERRUPT      37055         3.80%         0.16%         5.38us
>>                CPUID      32718         3.35%         0.08%         3.15us
>>        EXCEPTION_NMI      23601         2.42%         0.17%         8.87us
>>                  HLT      15424         1.58%        82.12%      6735.06us
>>            CR_ACCESS       4089         0.42%         0.02%         6.08us
>>
>> Total Samples:975981, Total events handled time:126502464.88us.
> 
> Have you thought about dumping a time history -- something similar to
> what perf-script can do with dumping events but adding in kvm-specific
> analysis like what you are doing in these examples?
> 


I will look into it and put it to my todo list if it is possible.
Thanks, David!

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