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

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Message-ID: <Pine.LNX.4.64.0707131114390.25352@fbirervta.pbzchgretzou.qr>
Date:	Fri, 13 Jul 2007 11:19:30 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Jesper Juhl <jesper.juhl@...il.com>,
	Ray Lee <ray-lk@...rabbit.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?


On Jul 12 2007 21:14, Jeremy Fitzhardinge wrote:
>
> Well, smaller stacks are better where possible, but there's nothing magic about
> 4k.

There is. It is exactly one page on x86. I cannot remember who said it when,
but anything greater than a page implies some penalty.

> Sure, its mostly enough, but there's no particular reason to believe it
> will be enough for everything.  You could state a priori that all kernel
> code paths must fit into 4k of stack, but that's pretty arbitrary.

	Jan
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