linux-kernel - Re: [PATCH] lockdep: Add nr_save_trace

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Message-ID: <20100423084926.GE21328@windriver.com>
Date:	Fri, 23 Apr 2010 16:49:26 +0800
From:	Yong Zhang <yong.zhang@...driver.com>
To:	John Kacur <jkacur@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Clark Williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [PATCH] lockdep: Add nr_save_trace_invocations counter

On Fri, Apr 23, 2010 at 10:31:16AM +0200, John Kacur wrote:
> > 8752+871+8+95+5+28+543+28+543+15=10888
> >
> > So you get a stack-trace for each direct-dependency, and you get a
> > stack-trace for each LOCK_state, the sum seems to match the total
> > invocations.
> >
> > Non of these numbers look strange..
> >
> 
> As I told Peter privately the laptop that triggered the
> MAX_STACK_TRACE_ENTRIES every time, has met an
> unfortunate early demise. However, I think it was the config - not the
> hardware. On this machine where the above
> numbers come from, I believe I have less debug options configured -
> but it is running the exact same kernel as
> the laptop was. (2.6.33.2-rt13)

Through a rough computation:
MAX_STACK_TRACE_ENTRIES/10888 = 24
That means the average stack deepth is about 24.
So I'm thinking if we can take a check on the biggest deepth?
Could this make sense?

Thanks,
Yong

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