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

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Date:	Tue, 23 Mar 2010 10:46:00 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Soeren Sandmann <sandmann@...mi.au.dk>
Cc:	Andi Kleen <andi@...stfloor.org>, 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

Soeren Sandmann <sandmann@...mi.au.dk> writes:

> [...]
>         - 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?
> [...]

These kinds of questions usually require navigation through internal
data of the user-space process ("Where in this linked list is this
pointer?"), and often also correlating them with history ("which
socket/fd was most recently serviced?").

Systemtap excels at letting one express such things.

- FChE
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