linux-kernel - Re: x86: 4kstacks default

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Date:	Mon, 21 Apr 2008 16:29:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...radead.org>, andi@...stfloor.org,
	joern@...fs.org, w@....eu, lkml@....ca, bunk@...nel.org,
	alan@...rguk.ukuu.org.uk, shawn.bohrer@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: x86: 4kstacks default


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> > On Sun, 20 Apr 2008 11:50:53 -0700 Arjan van de Ven <arjan@...radead.org> wrote:
> > On Sun, 20 Apr 2008 20:19:30 +0200
> > Andi Kleen <andi@...stfloor.org> wrote:
> > 
> > > In theory if you e.g. convert a recursive algorithm
> > > to iterative you might save some cache foot print, but I don't
> > > think that really happens in kernel code.
> > > 
> > 
> > this is what Al did for the symlink recursion thing, and Jens did 
> > for the block layer... so yes this conversion does happen for real.
> 
> md got mostly-fixed too, via Neil's patch which sat in -mm for nearly 
> two years.

had we done the de-obfuscate-4K-stacks Kconfig change earlier it might 
have gotten upstream faster.

	Ingo
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