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

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Message-ID: <20100317081410.GD16374@elte.hu>
Date:	Wed, 17 Mar 2010 09:14:10 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Anthony Liguori <aliguori@...ux.vnet.ibm.com>,
	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


* Frank Ch. Eigler <fche@...hat.com> wrote:

> 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? [...]

Note, 'perfctr' is a different out-of-tree Linux kernel project run by someone 
else: it offers the /dev/perfctr special-purpose device that allows raw, 
unabstracted, low-level access to the PMU.

I suspect the one you wanted to mention here is called 'perf' or 'perf 
events'. (and used to be called 'performance counters' or 'perfcounters' until 
it got renamed about a year ago)

Thanks,

	Ingo
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