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

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Message-ID: <4BA9B454.5090908@redhat.com>
Date:	Wed, 24 Mar 2010 08:42:28 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Joerg Roedel <joro@...tes.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	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>,
	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 03/24/2010 07:09 AM, Andi Kleen wrote:
> Joerg Roedel<joro@...tes.org>  writes:
>    
>> Sidenote: I really think we should come to a conclusion about the
>>            concept. KVM integration into perf is very useful feature to
>> 	  analyze virtualization workloads.
>>      
> Agreed. I especially would like to see instruction/branch tracing
> working this way.  This would a lot of the benefits of a simulator on
> a real CPU.
>    

If you're profiling a single guest it makes more sense to do this from 
inside the guest - you can profile userspace as well as the kernel.

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

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