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

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Message-ID: <4BC59A01.3070802@redhat.com>
Date:	Wed, 14 Apr 2010 13:33:37 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Sheng Yang <sheng@...ux.intel.com>
CC:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com, Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest os statistics
 from host side

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?

-- 
error compiling committee.c: too many arguments to function

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