linux-kernel - Re: combinatorial explosion in lockdep

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Date:	Mon, 28 Jul 2008 15:50:04 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	David Miller <davem@...emloft.net>
CC:	mingo@...e.hu, peterz@...radead.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: combinatorial explosion in lockdep

David Miller wrote:
> The triggering event seems to be kstopmachine as done by the first
> module load.  This seems to create the situation where we do double RQ
> locking on essentially all the run queues, in order to move the
> kstopmachine threads around to their proprer cpus.  I think this is
> what starts to make the lockdep dependency chains huge.
>   

Does Rusty's stop_machine rewrite which puts the threads on the correct 
cpus to start with at least mitigate the symptoms?

    J
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