linux-kernel - Re: [PATCH V2 2/5] ara virt interface of perf to support kvm guest os statistics collection in guest os

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Message-ID: <4C208531.3040403@redhat.com>
Date:	Tue, 22 Jun 2010 12:41:05 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	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, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH V2 2/5] ara virt interface of perf to support kvm guest
 os statistics collection in guest os

On 06/22/2010 12:25 PM, Zhang, Yanmin wrote:
>
>> I'm talking about the guest/host interface.  So you have one vmexit and
>> many host perf calls.
>>      
> I understood what you were speaking. I mean, perf generic codes operate perf_event
> one by one. At low layer, we just know one perf_event before calling hypercall to
> vmexit to host kernel.
>    

Ah.

We might fix that by having the perf ops work on guest memory, and add a 
commit that transfers them to the host.  But this is complicated and can 
be left for later.

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

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