linux-kernel - Re: [PATCH 08/13 v2] ftrace: do not trace init sections

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Message-ID: <20081023164032.GA19070@elte.hu>
Date:	Thu, 23 Oct 2008 18:40:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jan Kiszka <jan.kiszka@...mens.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Abhishek Sagar <sagar.abhishek@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 08/13 v2] ftrace: do not trace init sections


* Steven Rostedt <rostedt@...dmis.org> wrote:

> > I don't know if this feature is already considered for / part of 
> > mainline, but oops backtraces based on mcount instrumentation used 
> > to be quite helpful for me to understand the wider context of 
> > several faults. The more you have to mask out of this picture, the 
> > harder it gets to match the trace to your model of the kernel 
> > activities. At least you have to know more in advance about the 
> > limitation of the tracer...
> 
> The ftrace buffer can be dumped out on oops. I'm not sure if it is 
> always on. If it is, I need to make it default off and add a command 
> line and sysctl to turn it on. Otherwise, we will have people 
> complaining about the extra output to the console on oops.

it dumps currently if a tracer is enabled. I saw it a couple of times 
already during crashes.

	Ingo
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