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

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Message-ID: <469EB4E5.2040300@gmail.com>
Date:	Thu, 19 Jul 2007 02:48:37 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Matt Mackall <mpm@...enic.com>
CC:	Andrea Arcangeli <andrea@...e.de>, 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...?

On 07/19/2007 02:41 AM, Matt Mackall wrote:

> On Thu, Jul 19, 2007 at 02:15:39AM +0200, Andrea Arcangeli wrote:

>> Using kmalloc(8k) instead of alloc_page() doesn't sound a too big deal
>> and that will solve the problem.
> 
> How do you figure?
> 
> If you're saying that soft pages helps our 8k stack allocations, it
> doesn't. The memory overhead of soft pages will be higher (5-15%,
> mostly due to file tails in pagecache) than the level at which 8k
> stacks currently run into trouble (1-2% free?).
> 
> Not helpful.

With tail-packing it is.

Rene.

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