linux-kernel - Re: [PATCH] tracing: Dump either the oops's cpu source or all cpus buffers

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Message-Id: <20100418.211900.183039797.davem@davemloft.net>
Date:	Sun, 18 Apr 2010 21:19:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fweisbec@...il.com
Cc:	rostedt@...dmis.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de, lizf@...fujitsu.com, laijs@...fujitsu.com
Subject: Re: [PATCH] tracing: Dump either the oops's cpu source or all cpus
 buffers

From: Frederic Weisbecker <fweisbec@...il.com>
Date: Sun, 18 Apr 2010 22:50:10 +0200

> The ftrace_dump_on_oops kernel parameter, sysctl and sysrq let one
> dump every cpu buffers when an oops or panic happens.
> 
> It's nice when you have few cpus but it may take ages if have many,
> plus you miss the real origin of the problem in all the cpu traces.
> 
> Sometimes, all you need is to dump the cpu buffer that triggered the
> opps, most of the time it is our main interest.
> 
> This patch modifies ftrace_dump_on_oops to handle this choice.
> 
> The ftrace_dump_on_oops kernel parameter, when it comes alone, has
> the same behaviour than before. But ftrace_dump_on_oops=orig_cpu
> will only dump the buffer of the cpu that oops'ed.
> 
> Similarly, sysctl kernel.ftrace_dump_on_oops=1 and
> echo 1 > /proc/sys/kernel/ftrace_dump_on_oops keep their previous
> behaviour. But setting 2 jumps into cpu origin dump mode.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Thanks I was trying to figure out a way to make ftrace dump
do exactly this over the past few days :-)

Acked-by: David S. Miller <davem@...emloft.net>
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