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

[Andrew Morton]

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

> Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> 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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