linux-kernel - Re: [PATCH 1/2] tracing: Add sysctl to enable/disable tracing on oops

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Date:	Wed, 09 Sep 2009 09:47:24 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	rostedt@...dmis.org
CC:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tracing: Add sysctl to enable/disable tracing on
 oops

Steven Rostedt wrote:
> On Wed, 2009-09-09 at 09:37 +0800, Li Zefan wrote:
>> Steven Rostedt wrote:
>>> On Wed, 2009-09-09 at 09:15 +0800, Li Zefan wrote:
>>>> Currently we always disable tracing on oops, and this patch
>>>> adds a sysctl so one can choose to enable it.
>>> Hmm, we already have a way to enable it.
>>>
>>> # echo 1 > /debug/tracing/tracing_on
>>>
>> What I want is a way to not disable it when an oops happened. :)
>>
> 
> Ah, I misunderstood. May I ask a silly question?
> 
> Why?
> 

Otherwise we won't get trace output from trae_crash_kexec if
crash_kexec() is not called by panic(). For example:

  oops_begin()
->trace_off()
->panic_on_oops
->kexec_should_crash()
->crash_kexec()
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