linux-kernel - Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

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Date:	Mon, 26 Jan 2009 16:00:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Kevin Shanahan <kmshanah@...b.org.au>, Avi Kivity <avi@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> Is there a way to add a wall-time column to this output so that we can 
> see where the time goes?

yes, on tip/master:

  http://people.redhat.com/mingo/tip.git/README

do something like this:

 echo funcgraph-abstime > /debug/tracing/trace_options

when the function-graph plugin is active. This will activate the absolute 
timestamps column in the trace output.

> Another something nice would be to have ctx switches like:
> 
> foo-1 => bar-2 ran: ${time foo spend on the cpu} since: ${time bar spend away from the cpu}
> 
> I'll poke me a little at this function graph tracer thingy to see if I 
> can do that.

indeed, tracking the 'scheduling atom duration' would be very nice.

	Ingo
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