linux-kernel - Re: [PATCH] disable softlockup detection at boottime

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Message-ID: <20080429123522.GK31271@elte.hu>
Date:	Tue, 29 Apr 2008 14:35:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] disable softlockup detection at boottime


* Dimitri Sivanich <sivanich@....com> wrote:

> On Mon, Apr 28, 2008 at 06:55:44PM +0200, Ingo Molnar wrote:
> > 
> > good idea - but why dont you set softlockup_thresh to 0, which is the 
> > "off" switch already? (and that way it can be turned back on later as 
> > well, by the sysadmin.)
> > 
> 
> I'm getting unaligned access errors trying to set it to anything, so 
> it's not working for me currently (2.6.25):
> 
> It's tripping up on the address of 'one', which is an int that is not 
> properly aligned for the unsigned long comparison in 
> proc_doulongvec_minmax on my 64 bit machine.  Also, the value '0' is 
> invalid for softlockup_thresh, correct?
> 
> I temporarily got around these issues with the following hack.

ah, sorry. But ... perhaps using threshold -1 would be the most 
intuitive setting? (for 'infinite timeout' ==> softlockup detector 
turned off) That way it all becomes configurable as part of the 
threshold? No strong opinion though.

	Ingo
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