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Subject: Re: [RFC 0/8] Reduce MAX_NR_ZONES and remove useless zones.
From: Arjan van de Ven <arjan@infradead.org>
To: Christoph Lameter <clameter@sgi.com>
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Date: Tue, 04 Jul 2006 18:47:42 +0200
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On Tue, 2006-07-04 at 09:41 -0700, Christoph Lameter wrote:
> On Tue, 4 Jul 2006, Arjan van de Ven wrote:
> 
> > >  will need to have highmem? I guess the 2G/2G 
> > > config option changes that?
> > 
> > but that breaks userspace ABI and things that really want a lot of
> > memory ;)
> 
> Really? What things does it break? Sorry about my i386 ignorance.

things that assume you can malloc a 2gb area for example, or use a 2Gb
stack. Yes fortran apps do that..

> 
> > Thankfully x86-64 is there, and just about all systems sold today do 64
> > bit.. 
> 
> Right but then some binary stuff is only available for 32 bit.

the good news is that x86-64 has a pretty good 32 bit emulation... so
that's not an actual problem...