linux-kernel - Re: [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE

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Date:	Wed, 8 Jul 2009 14:44:18 -0400
From:	Dave Jones <davej@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Joao Correia <joaomiguelcorreia@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE_ENTRIES

On Wed, Jul 08, 2009 at 08:36:04PM +0200, Peter Zijlstra wrote:
 > Looking at a lockdep dump hch gave me I can see that that is certainly
 > possible, I see tons of very deep callchains.
 > 
 > /me wonders if we're getting significantly deeper..
 > 
 > OK I guess we can raise this one, does doubling work? That would get us
 > around 29 entries per trace..
 > 
 > Also, Dave do these distro init scrips still load every module on the
 > planet or are we more sensible these days?
 > module load/unload cycles are really bad for lockdep resources.

34 modules get loaded on the system I saw the trace on. 
(That's from lsmod after fulling booting up). I'm not aware of any
module unloading that happens during bootup.
 
	Dave

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