linux-kernel - Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

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Date:	Fri, 27 Jul 2007 08:02:13 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andrea Arcangeli <andrea@...e.de>, Matt Mackall <mpm@...enic.com>,
	Rene Herman <rene.herman@...il.com>,
	Ray Lee <ray-lk@...rabbit.org>, Bodo Eggert <7eggert@....de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

Alan Cox wrote:
>> I don't think they're necessarily bugs. IMHO the WARN_ON is better off
>> at 7k level like it is today with the current STACK_WARN. 4k for a
>> stack for common code really is small. I doubt you're going to find
> 
> You want the limit settable. On a production system you want to set the
> limit to somewhere appropriate for the stack size used. When debugging
> (eg to remove any last few bogus users of 8K stack space) you want to be
> able to set it to just under 4K

Hm, when cramming cxfs into 4k at sgi, I had a patch that did just that
for debugging (warn about encroaching on 4k without actually tipping
over, with a settable threshold...)

Maybe I should resurrect it & send it out...

(FWIW I think I recall that the warning itself sometimes tipped the
scales enough on 4k stacks to bring the box down)

-eric
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