linux-kernel - Re: [v2.6.26] what's brewing in x86.git for v2.6.26

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Message-Id: <20080417031829.15ec73df.akpm@linux-foundation.org>
Date:	Thu, 17 Apr 2008 03:18:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [v2.6.26] what's brewing in x86.git for v2.6.26

On Thu, 17 Apr 2008 12:11:36 +0200 Andi Kleen <andi@...stfloor.org> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> >
> > Does it really really really need to consume one of our few remaining page
> > flags?  We'll be in a mess when we run out.
> 
> No we're not. Just the (imho always misguided) "encode zone/node number 
> into flags" optimization has to be removed again or made 64bit only.
> Then there will be plenty of flags again.

hm.  Or we add a new nid&zone field to the pageframe for 32bit NUMA.  Just
don't tell Paul Mundt ;)

Need to work out what's going on with ia64's use of the upper 32 bits too. 
I have a feeling it's using less than it used too but at 3AM I can't be
assed working it out.

> Really I see no real reason this can't be done with a small hash table
> again like x86-64 originally did.

How did that work?  A pfn->zone-id hash table would be huge?
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