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

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Message-ID: <20090709161059.GA2909@redhat.com>
Date:	Thu, 9 Jul 2009 12:10:59 -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 Thu, Jul 09, 2009 at 10:02:36AM +0200, Peter Zijlstra wrote:
 > On Thu, 2009-07-09 at 00:39 -0400, Dave Jones wrote:
 > > 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..
 > > 
 > > Looking at /proc/lockdep, I'm curious..
 > > Take a look at http://davej.fedorapeople.org/lockdep
 > > scroll down to c12c0924
 > > 
 > > What's up with all those old_style_spin_init's ?
 > 
 > What kernel are you running?

.31rc2

 > Does your lib/dma_debug.c:dma_debug_init()
 > have spin_lock_init() in that HASH_SIZE loop?

it's doing it by hand..

 717         for (i = 0; i < HASH_SIZE; ++i) {
 718                 INIT_LIST_HEAD(&dma_entry_hash[i].list);
 719                 dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
 720         }


	Dave
 
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