linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Message-ID: <4BA7D6DC.7060601@redhat.com>
Date:	Mon, 22 Mar 2010 22:45:16 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"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,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single
 project

On 03/22/2010 10:35 PM, Ingo Molnar wrote:
>
>>> And your point is that such vcpus should be excluded from profiling just
>>> because they fall outside the Qemu/libvirt umbrella?
>>>
>>> That is a ridiculous position.
>>>
>>>        
>> Non-guest vcpus will not be able to provide Linux-style symbols.
>>      
> And why do you say that it makes no sense to profile them?
>    

It makes sense to profile them, but you don't need to contact their 
userspace tool for that.

> Also, why do you define 'guest vcpus' to be 'Qemu started guest vcpus'? If
> some other KVM using project (which you encouraged just a few mails ago)
> starts a vcpu we still want to be able to profile them.
>
>    

Maybe it should provide a mechanism for libvirt to list it.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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