linux-kernel - Re: bug in tty ldisc and friends

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Message-ID: <20090616103435.GI5139@amd.com>
Date:	Tue, 16 Jun 2009 12:34:35 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: bug in tty ldisc and friends

On Tue, Jun 16, 2009 at 12:29:10PM +0200, Ingo Molnar wrote:
> We are now well below the limit for stack-trace entries.
> 
> This is something we noticed recently: dma-debug uses a lot of lock 
> classes and thus creates a really large lock-graph, depleting the 
> reserves quickly.

Is this considered a problem? I increased the hash-size to 1024 for
performance reasons (== 1024 spin_locks). But if it hurts to much in
other places this can be reverted.

	Joerg

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