From: Andi Kleen <ak@suse.de>
To: Benjamin LaHaise <bcrl@kvack.org>
Subject: Re: [2.6 patch] i386: always use 4k stacks
Date: Wed, 16 Nov 2005 20:08:50 +0100
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Cc: Adrian Bunk <bunk@stusta.de>, Arjan van de Ven <arjan@infradead.org>,
       Oliver Neukum <oliver@neukum.org>, jmerkey <jmerkey@utah-nac.org>,
       =?iso-8859-1?q?J=F6rn_Engel?= <joern@wohnheim.fh-wedel.de>,
       alex14641@yahoo.com, linux-kernel@vger.kernel.org
References: <20051116005034.73421.qmail@web50210.mail.yahoo.com> <20051116184508.GP5735@stusta.de> <20051116190334.GC982@kvack.org>
In-Reply-To: <20051116190334.GC982@kvack.org>
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On Wednesday 16 November 2005 20:03, Benjamin LaHaise wrote:
> On Wed, Nov 16, 2005 at 07:45:08PM +0100, Adrian Bunk wrote:
> > The problem is similar no matter whether you have 4k or 8k stacks, but 
> > with 4k stacks you have the additional benefits of order 0 allocations 
> > and less memory usage.
> 
> We could implement a stack guard page for the transition period, so that 
> any stack overflows would end up generating a fault.  That's easy enough 
> to do by using vmalloc()

And would add considerable overhead in TLB flushes and locking ...

-Andi
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