linux-kernel - Re: [-mm patch] i386: enable 4k stacks by default

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Message-ID: <Pine.LNX.4.61.0704302021160.29151@yvahk01.tjqt.qr>
Date:	Mon, 30 Apr 2007 20:22:43 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	William Lee Irwin III <wli@...omorphy.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Chinner <dgc@....com>, Zan Lynx <zlynx@....org>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [-mm patch] i386: enable 4k stacks by default


On Apr 30 2007 10:38, William Lee Irwin III wrote:
>> static char softirq_stack[NR_CPUS * THREAD_SIZE]
>>                 __attribute__((__aligned__(THREAD_SIZE)));
>> 
>> static char hardirq_stack[NR_CPUS * THREAD_SIZE]
>>                 __attribute__((__aligned__(THREAD_SIZE)));
>> 
>> With 8K stacks and NR_CPUS==128 that would be 2MB statically reserved. Yuck.
>> Really needs to be dynamically allocated. I'll take a look once the .22 
>> big merge is done.
>
>Here's what I did for i386 for someone concerned about blowing the stack.

If we really need it, then maybe a variable like CONFIG_LOG_BUF_SHIFT
could be hacked up, resulting in CONFIG_THREAD_SIZE_SHIFT, defaulting to 3
(=8KB).


Jan
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