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

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Message-ID: <20080429124426.GA20775@sgi.com>
Date:	Tue, 29 Apr 2008 07:44:26 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Ingo Molnar <mingo@...e.hu>
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

On Tue, Apr 29, 2008 at 02:35:22PM +0200, Ingo Molnar wrote:
> * Dimitri Sivanich <sivanich@....com> wrote:
> 
> > 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.
>

Having the ability to switch it off dynamically would be nice to have, but
will need a little work yet.  Any solution should also minimize the amount
of time spent in softlockup_tick.

Either '0' or '-1' seems OK to me, but if '-1' turns it off, do we allow
a value of '0'?.
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