linux-kernel - Re: locking hierarchy based on lockdep

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Message-ID: <Pine.LNX.4.64.0611091354060.17915@dhcp83-20.boston.redhat.com>
Date:	Thu, 9 Nov 2006 13:58:29 -0500 (EST)
From:	Jason Baron <jbaron@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org, arjan@...radead.org,
	rdreier@...co.com
Subject: Re: locking hierarchy based on lockdep


On Thu, 9 Nov 2006, Ingo Molnar wrote:

> 
> * Jason Baron <jbaron@...hat.com> wrote:
> 
> > You are right though, i think that the data in the locks after lists 
> > is sufficient to re-create the entire graph, since its acyclic, but by 
> > simply printing out nodes of distance '1', the algorithm is greatly 
> > simplified. Otherwise, i'd have to first reconstruct the graph...
> 
> but ... the locks_after list should really only include locks that are 
> taken immediately after. I.e. there should only be 'distance 1' locks.
> 

hmmm...that's not how i read the lockdep code...and the little piece of 
code that i added to add a distance measurement to links, found mostly 
distance 1 links but there were a number of 2 and 3 links as well (i don't 
think i saw any greater than 3).

thanks.

-Jason
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