linux-kernel - Re: KVM: perf: a smart tool to analyse kvm events

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Date:	Fri, 17 Feb 2012 10:35:04 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Pradeep Kumar <psuriset@...ux.vnet.ibm.com>
CC:	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: KVM: perf: a smart tool to analyse kvm events

On 02/16/2012 11:52 PM, Pradeep Kumar wrote:

> Xiao,
> 
>  i tried your perf events patch set on RHEL 6.1 host and failed to trace kvm-events with below error message.
> 
>   [root@kvm perf]# ./perf kvm-events report
>   Warning: unknown op '{'
>   Warning: Error: expected type 5 but read 1
>   Warning: failed to read event print fmt for hrtimer_start
>   Warning: unknown op '{'
>   Warning: Error: expected type 5 but read 1
>   Warning: failed to read event print fmt for hrtimer_expire_entry
>   Analyze events for all VCPUs:
>   VM-EXIT    Samples  Samples%     Time%         Avg time               
>   Total Samples:0, Total events handled time:0.00us.
>   [root@kvm perf]#          
> 	     


Thanks for your try, Pradeep!

It seems that kvm events do not be recorded.

Do your guest was running when kvm-events was executed?
What is the output of "./perf script | grep kvm_*"?

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