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

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Date:	Tue, 16 Mar 2010 19:01:57 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	oerg Roedel <joro@...tes.org>
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>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, ziteng.huang@...el.com,
	sungho.kim.zd@...achi.com
Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from
 host side

oerg Roedel wrote:
> On Tue, Mar 16, 2010 at 12:25:00PM +0100, Ingo Molnar wrote:
>> Hm, that sounds rather messy if we want to use it to basically expose kernel 
>> functionality in a guest/host unified way. Is the qemu process discoverable in 
>> some secure way? Can we trust it? Is there some proper tooling available to do 
>> it, or do we have to push it through 2-3 packages to get such a useful feature 
>> done?
> 
> Since we want to implement a pmu usable for the guest anyway why we
> don't just use a guests perf to get all information we want? If we get a
> pmu-nmi from the guest we just re-inject it to the guest and perf in the
> guest gives us all information we wand including kernel and userspace
> symbols, stack traces, and so on.

I guess this aims to get information from old environments running on
kvm for life extension :)

> In the previous thread we discussed about a direct trace channel between
> guest and host kernel (which can be used for ftrace events for example).
> This channel could be used to transport this information to the host
> kernel.

Interesting! I know the people who are trying to do that with systemtap.
See, http://vesper.sourceforge.net/

> 
> The only additional feature needed is a way for the host to start a perf
> instance in the guest.

# ssh localguest perf record --host-chanel ... ? B-)

Thank you,

> 
> Opinions?
> 
> 
> 	Joerg
> 
> --
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-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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