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

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Message-ID: <4B9F603B.4080004@redhat.com>
Date:	Tue, 16 Mar 2010 12:40:59 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	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>, ziteng.huang@...el.com
Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from
 host side

On 03/16/2010 12:20 PM, Ingo Molnar wrote:
>>>>
>>>> The symbol server's client can certainly access the bits through vmchannel.
>>>>          
>>> Ok, that would work i suspect.
>>>
>>> Would be nice to have the symbol server in tools/perf/ and also make it easy
>>> to add it to the initrd via a .config switch or so.
>>>
>>> That would have basically all of the advantages of being built into the kernel
>>> (availability, configurability, transparency, hackability), while having all
>>> the advantages of a user-space approach as well (flexibility, extensibility,
>>> robustness, ease of maintenance, etc.).
>>>        
>> Note, I am not advocating building the vmchannel client into the host
>> kernel. [...]
>>      
> Neither am i. What i suggested was a user-space binary/executable built in
> tools/perf and put into the initrd.
>    

I'm confused - initrd seems to be guest-side.  I was talking about the 
host side.

For the guest, placing the symbol server in tools/ is reasonable.

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

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