linux-kernel - Re: [PATCH] ftrace: ftrace_dump_on

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Message-ID: <alpine.DEB.1.10.0811011441210.13362@gandalf.stny.rr.com>
Date:	Sat, 1 Nov 2008 14:43:06 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ftrace: ftrace_dump_on_oops=[tracer]

On Sat, 1 Nov 2008, Peter Zijlstra wrote:

> seems useful to debug crashes that happen before I read userspace.

Hmm, I think it might be better to separate this from the dump_on_oops.
How about a ftrace_default_tracer parameter?

If one is defined, it is activated as soon as it is initialized. This way 
we decouple the dump_on_oops, which we may not always want, and a way to 
start tracers before the switch to user space.

-- Steve
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