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

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Message-ID: <20100322203215.GB18126@elte.hu>
Date:	Mon, 22 Mar 2010 21:32:15 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Avi Kivity <avi@...hat.com>, 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


* Anthony Liguori <anthony@...emonkey.ws> wrote:

> On 03/22/2010 02:22 PM, Ingo Molnar wrote:
> >>Transitive had a product that was using a KVM context to run their
> >>binary translator which allowed them full access to the host
> >>processes virtual address space range.  In this case, there is no
> >>kernel and there are no devices.
> >
> > And your point is that such vcpus should be excluded from profiling just 
> > because they fall outside the Qemu/libvirt umbrella?
> 
> You don't instrument it the way you'd instrument an operating system so no, 
> you don't want it to show up in perf kvm top.

Erm, why not? It's executing a virtualized CPU, so sure it makes sense to 
allow the profiling of it!

It might even not be the weird case you mentioned by some competing 
virtualization project to Qemu ...

So your argument is wrong on several technical levels, sorry.

Thanks,

	Ingo
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