linux-kernel - Re: Early hang with 2.6.21-rc4-rt1

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Date:	Fri, 30 Mar 2007 11:02:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roland Dreier <rdreier@...co.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Early hang with 2.6.21-rc4-rt1


* Roland Dreier <rdreier@...co.com> wrote:

> Great, thanks ... I'm not sure which of the 2 patches fixed things, 
> but I now got the following trace.  I've not really analyzed this, but 
> it definitely looks like tun_init() is doing something fishy... 
> ("149776 us maximum-latency"!!)

best would be to enable FUNCTION_TRACING and to do:

	echo 1 > /proc/sys/kernel/trace_enabled
	echo 1 > /proc/sys/kernel/mcount_enabled

this will give you an exact trace of what happened, in 
/proc/latency_trace.

	Ingo
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