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

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Message-ID: <20090710203433.GA11105@redhat.com>
Date:	Fri, 10 Jul 2009 16:34:33 -0400
From:	Dave Jones <davej@...hat.com>
To:	Joao Correia <joaomiguelcorreia@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Amerigo Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH 3/3] Increase lockdep limits: MAX_LOCKDEP_CHAINS_BITS

On Wed, Jul 08, 2009 at 08:33:37PM +0100, Joao Correia wrote:
 > On Wed, Jul 8, 2009 at 8:32 PM, Joao Correia<joaomiguelcorreia@...il.com> wrote:
 > > On Wed, Jul 8, 2009 at 7:34 PM, Peter Zijlstra<a.p.zijlstra@...llo.nl> wrote:
 > >> On Tue, 2009-07-07 at 16:25 +0100, Joao Correia wrote:
 > >>> (Applies to current Linus tree, as of 2.6.31-rc2)
 > >>>
 > >>> A third limit becomes apparent as being too low after raising
 > >>> MAX_STACK_TRACE_ENTRIES and MAX_LOCK_DEPTH, although this one is more
 > >>> elusive to trigger.
 > >>
 > >> Would this involve reloading modules a lot?
 > >>
 > >>
 > >
 > > All the other limits were triggered immediatly upon boot. This one
 > > happens during regular system usage, after a couple of hours. Not
 > > loading more modules than needed, the system stays at around 45
 > > modules loaded, give or take. I do have qemu running, if that helps
 > > anything.
 > >
 > > Joao Correia
 > >
 > 
 > qemu running as a -host-, not the system running inside it. Just to clear it up.

Could you upload your /proc/lockdep someplace ? Maybe there's some obvious
clues in there like the ones we saw in mine.

	Dave

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