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

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Date:	Wed, 24 Mar 2010 17:23:43 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Avi Kivity <avi@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	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>, 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 Wed, Mar 24, 2010 at 05:03:42PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-03-24 at 16:01 +0100, Joerg Roedel wrote:
> 
> > What I meant was: perf-kernel puts the guest-name into every sample and
> > perf-userspace accesses /sys/kvm/guest_name/fs/ later to resolve the
> > symbols. I leave the question of how the guest-fs is exposed to the host
> > out of this discussion. We should discuss this seperatly.
> 
> I'd much prefer a pid like suggested later, keeps the samples smaller.
> 
> But that said, we need guest kernel events like mmap and context
> switches too, otherwise we simply can't make sense of guest userspace
> addresses, we need to know the guest address space layout.

With the filesystem approach all we need is the pid of the guest
process. Then we can access proc/<pid>/maps of the guest and read out the
address space layout, no?

	Joerg

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