From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events
Date: Tue, 17 Jan 2012 10:30:59 +0800 [thread overview]
Message-ID: <4F14DD63.3010901@linux.vnet.ibm.com> (raw)
In-Reply-To: <4F13F7EB.3060108@redhat.com>
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!
next prev parent reply other threads:[~2012-01-17 2:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 9:30 [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events Xiao Guangrong
2012-01-16 9:31 ` [PATCH 1/3] KVM: trace mmio read event properly Xiao Guangrong
2012-01-16 10:18 ` Avi Kivity
2012-01-17 2:36 ` Xiao Guangrong
2012-01-16 9:32 ` [PATCH 2/3] KVM: improve trace events of vmexit/mmio/ioport Xiao Guangrong
2012-01-16 9:38 ` Avi Kivity
2012-01-17 2:28 ` Xiao Guangrong
2012-01-17 11:55 ` Marcelo Tosatti
2012-01-17 17:31 ` David Ahern
2012-01-18 2:32 ` Xiao Guangrong
2012-01-18 5:34 ` David Ahern
2012-01-24 12:44 ` Avi Kivity
2012-01-16 9:32 ` [PATCH 3/3] KVM: perf: kvm events analysis tool Xiao Guangrong
2012-01-16 10:04 ` Avi Kivity
2012-01-17 2:30 ` Xiao Guangrong
2012-01-24 12:49 ` Avi Kivity
2012-01-16 10:08 ` Stefan Hajnoczi
2012-01-17 2:37 ` Xiao Guangrong
2012-01-17 11:59 ` Marcelo Tosatti
2012-01-24 12:51 ` Avi Kivity
2012-01-16 10:11 ` [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events Avi Kivity
2012-01-17 2:30 ` Xiao Guangrong [this message]
2012-01-16 22:53 ` David Ahern
2012-01-17 2:41 ` Xiao Guangrong
2012-01-17 4:49 ` David Ahern
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