linux-kernel - Re: x86: 4kstacks default

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Message-ID: <480BBAF9.1040702@firstfloor.org>
Date:	Sun, 20 Apr 2008 23:51:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Arjan van de Ven <arjan@...radead.org>, dhazelton@...er.net,
	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 11:48:45 -0700 Arjan van de Ven <arjan@...radead.org> wrote:
>> We don't have effective physical address based reclaim yet for higher order allocs.
> 
> Lumpy reclaim is supposed to be exactly that.

Also if order 1 allocs were a significant problem on i386 we must have
had lots of reports of EAGAIN on fork/clone with !4k stack kernels. I'm
not aware of an significant number of such reports (there were a few
occasionally, but that is probably normal and unavoidable and can
be caused by other things too like simply running out of lowmem)

-Andi

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