linux-kernel - Re: locking hierarchy based on lockdep

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Message-ID: <20061108130833.GA9599@elf.ucw.cz>
Date:	Wed, 8 Nov 2006 14:08:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	arjan@...radead.org, rdreier@...co.com
Subject: Re: locking hierarchy based on lockdep

Hi!

> > * Jason Baron <jbaron@...hat.com> wrote:
> > 
> > > I've implemented this as a /proc file, but Ingo suggested that it 
> > > might be better for us to simply produce an adjaceny list, and then 
> > > generate a locking hierarchy or anything else of interest off of that 
> > > list.... [...]
> > 
> > this would certainly be the simplest thing to do - we could extend 
> > /proc/lockdep with the list of 'immediately after' locks separated by 
> > commas. (that list already exists: it's the lock_class.locks_after list)
> > 
> > i like your idea of using lockdep to document locking hierarchies.
> > 
> > 	Ingo
> > 
> 
> hi,
> 
> So below is patch that does what you suggest, although i had to add the 
> concept of 'distance' to the patch since the locks_after list loses this 
> dependency info afaict. i also wrote a user space program to sort the 
> locks into cluster of interelated locks and then sorted within these 
> clusters...the results show one large clump of locks...perhaps there are a 
> few locks that time them all together like scheduler locks...but i 
> couldn't figure out which ones to exclude to make the list look really 
> pretty (also, there could be a bug in my program :). Anyways i'm including 
> my test program and its output too...

Perhaps presenting it as a tree is worth it?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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