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

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Date:	Fri, 23 Apr 2010 10:05:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	John Kacur <jkacur@...hat.com>
Cc:	Yong Zhang <yong.zhang@...driver.com>,
	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, 2010-04-23 at 09:24 +0200, John Kacur wrote:
> direct dependencies:                  8752 [max: 16384]
> I have
> stack-trace invocations: 10888
> from the same run.
> 
> Still trying to figure out what the meaning is of that though to be 
> honest.
> 
> Here is a portion of the lockdep_stats, with all of the new fields and the 
> redundant ones.
> 
> stack-trace invocations: 10888
>         LOCK_USED_IN_HARDIRQ: 15
>         LOCK_USED_IN_HARDIRQ_READ: 0
>         LOCK_ENABLED_HARDIRQ: 543
>         LOCK_ENABLED_HARDIRQ_READ: 28
>         LOCK_USED_IN_SOFTIRQ: 0
>         LOCK_USED_IN_SOFTIRQ_READ: 0
>         LOCK_ENABLED_SOFTIRQ: 543
>         LOCK_ENABLED_SOFTIRQ_READ: 28
>         LOCK_USED_IN_RECLAIM_FS: 5
>         LOCK_USED_IN_RECLAIM_FS_READ: 0
>         LOCK_ENABLED_RECLAIM_FS: 95
>         LOCK_ENABLED_RECLAIM_FS_READ: 8
>         LOCK_USED: 871 

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.. 

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