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

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Date:	Wed, 17 Mar 2010 09:16:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>,
	Anthony Liguori <aliguori@...ux.vnet.ibm.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


* Avi Kivity <avi@...hat.com> wrote:

> Monitoring guests from the host is useful for kvm developers, but less so 
> for users.

Guest space profiling is easy, and 'perf kvm' is not about that. (plain 'perf' 
will work if a proper paravirt channel is opened to the host)

I think you might have misunderstood the purpose and role of the 'perf kvm' 
patch here? 'perf kvm' is aimed at KVM developers: it is them who improve KVM 
code, not guest kernel users.

	Ingo
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