Message-ID: <4C208531.3040403@redhat.com>
Date: Tue, 22 Jun 2010 12:41:05 +0300
From: Avi Kivity <avi@redhat.com>
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To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
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       Ingo Molnar <mingo@elte.hu>, Fr??d??ric Weisbecker <fweisbec@gmail.com>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Cyrill Gorcunov <gorcunov@gmail.com>, Lin Ming <ming.m.lin@intel.com>,
       Sheng Yang <sheng@linux.intel.com>,
       Marcelo Tosatti <mtosatti@redhat.com>, oerg Roedel <joro@8bytes.org>,
       Jes Sorensen <Jes.Sorensen@redhat.com>, Gleb Natapov <gleb@redhat.com>,
       Zachary Amsden <zamsden@redhat.com>, zhiteng.huang@intel.com,
       tim.c.chen@intel.com, Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH V2 2/5] ara virt interface of perf to support kvm guest
 os statistics collection in guest os
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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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