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

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Message-ID: <20100317004136.GC17472@redhat.com>
Date:	Tue, 16 Mar 2010 20:41:36 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Anthony Liguori <aliguori@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	"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

Hi -

On Tue, Mar 16, 2010 at 06:04:10PM -0500, Anthony Liguori wrote:
> [...]
> The only way to really address this is to change the interaction.  
> Instead of running perf externally to qemu, we should support a perf 
> command in the qemu monitor that can then tie directly to the perf 
> tooling.  That gives us the best possible user experience.

To what extent could this be solved with less crossing of
isolation/abstraction layers, if the perfctr facilities were properly
virtualized?  That way guests could run perf goo internally.
Optionally virt tools on the host side could aggregate data from
cooperating self-monitoring guests.

- FChE
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