linux-kernel - Re: [tip:tracing/urgent] tracing: Fix too large stack usage in do_one

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Message-Id: <1250879439.2964.3.camel@localhost.localdomain>
Date:	Fri, 21 Aug 2009 14:30:39 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-tip-commits@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dave Jones <davej@...hat.com>,
	Kyle McMartin <kyle@...artin.ca>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	catalin.marinas@....com, a.p.zijlstra@...llo.nl,
	jens.axboe@...cle.com, fweisbec@...il.com, stable@...nel.org,
	tglx@...utronix.de
Subject: Re: [tip:tracing/urgent] tracing: Fix too large stack usage in
 do_one_initcall()

On Fri, 2009-08-21 at 11:13 -0700, Linus Torvalds wrote:
> 
> On Fri, 21 Aug 2009, Andrew Morton wrote:
> > 
> > Do we have a max-stack-depth tracer widget btw?
> 
> Enable FTRACE and then STACK_TRACER. Then just do
> 
> 	cat /sys/kernel/debug/tracing/stack_trace
> 
> and you'll get this.

Just a nitpick, but you will want to also add "stacktrace" to the kernel
command line otherwise it is default off. If you forget to do that, you
can also enable it with /proc/sys/kernel/stack_tracer_enabled.

But if you forget what to do, the code will remind you:

[root@mxf ~]# cat /sys/kernel/debug/tracing/stack_trace 
        Depth    Size   Location    (-1 entries)
        -----    ----   --------
#
#  Stack tracer disabled
#
# To enable the stack tracer, either add 'stacktrace' to the
# kernel command line
# or 'echo 1 > /proc/sys/kernel/stack_tracer_enabled'
#


-- Steve


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