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Date: Tue, 16 Jun 2009 12:34:35 +0200
From: Joerg Roedel <joerg.roedel@amd.com>
To: Ingo Molnar <mingo@elte.hu>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Steven Rostedt <rostedt@goodmis.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: bug in tty ldisc and friends
Message-ID: <20090616103435.GI5139@amd.com>
References: <alpine.DEB.2.00.0906160144340.26673@gandalf.stny.rr.com> <20090616093741.0d5b36bc@lxorguk.ukuu.org.uk> <20090616085028.GA13771@elte.hu> <20090616095706.36f01282@lxorguk.ukuu.org.uk> <20090616100015.GD6432@elte.hu> <20090616110419.14bc9485@lxorguk.ukuu.org.uk> <20090616101240.GB28204@elte.hu> <20090616102509.GA32717@elte.hu> <20090616102910.GA11011@elte.hu>
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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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