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

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Message-ID: <ye84ok72kxi.fsf@camel23.daimi.au.dk>
Date:	23 Mar 2010 15:04:57 +0100
From:	Soeren Sandmann <sandmann@...mi.au.dk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Joerg Roedel <joro@...tes.org>, Ingo Molnar <mingo@...e.hu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.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>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side

Andi Kleen <andi@...stfloor.org> writes:

> Soeren Sandmann <sandmann@...mi.au.dk> writes:
> >
> > To fix that problem, it seems like we need some way to have python
> > export what is going on. Maybe the same mechanism could be used to
> > both access what is going on in qemu and python.
> 
> oprofile already has an interface to let JITs export
> information about the JITed code. C Python is not a JIT,
> but presumably one of the python JITs could do it.
> 
> http://oprofile.sourceforge.net/doc/devel/index.html

It's not that I personally want to profile a particular python
program. I'm interested in the more general problem of extracting more
information from profiled user space programs than just stack traces.

Examples:

        - What is going on inside QEMU? 

        - Which client is the X server servicing?

        - What parts of a python/shell/scheme/javascript program is
          taking the most CPU time?

I don't think the oprofile JIT interface solves any of these
problems. (In fact, I don't see why the JIT problem is even hard. The
JIT compiler can just generate a little ELF file with symbols in it,
and the profiler can pick it up through the mmap events that you get
through the perf interface).

> I know it's not envogue anymore and you won't be a approved 
> cool kid if you do, but you could just use oprofile? 

I am bringing this up because I want to extend sysprof to be more
useful. 


Soren
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