linux-kernel - Re: x86: 4kstacks default

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Message-ID: <480BBBE1.2090406@firstfloor.org>
Date:	Sun, 20 Apr 2008 23:55:45 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Arjan van de Ven <arjan@...radead.org>, joern@...fs.org, w@....eu,
	lkml@....ca, bunk@...nel.org, alan@...rguk.ukuu.org.uk,
	shawn.bohrer@...il.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: x86: 4kstacks default

Andrew Morton 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.

Congratulations, you found three examples in 8.4MLOC.

Ok ok I should have said it only happens very rarely (I still stand by
that :)

Anyways it is moot because it was a miscommunication between me and Joerg.

-Andi


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