linux-kernel - Re: [PATCH v2] ftrace: ftrace dump on oops control

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Date:	Mon, 27 Oct 2008 15:03:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2] ftrace: ftrace dump on oops control


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

> [
>   Changes since v1:
> 
>    Replaced /** with /* as Randy explained that kernel-doc does
>     not yet handle variables.
> ]
> 
> Currently, ftrace is set up to dump its contents to the console if the
> kernel panics or oops. This can be annoying if you have trace data in
> the buffers and you experience an oops, but the trace data is old or
> static.
> 
> Usually when you want ftrace to dump its contents is when you are debugging
> your system and you have set up ftrace to trace the events leading to
> an oops.
> 
> This patch adds a control variable called "ftrace_dump_on_oops" that will
> enable the ftrace dump to console on oops. This variable is default off
> but a developer can enable it either through the kernel command line
> by adding "ftrace_dump_on_oops" or at run time by setting (or disabling)
> /proc/sys/kernel/ftrace_dump_on_oops.
> 
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> ---
>  include/linux/ftrace.h |    2 ++
>  kernel/sysctl.c        |   10 ++++++++++
>  kernel/trace/trace.c   |   29 ++++++++++++++++++++++++++---
>  3 files changed, 38 insertions(+), 3 deletions(-)

applied to tip/tracing/ftrace, thanks Steve!

	Ingo
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