Re: [PATCH] numa: mempolicy: dynamic interleave map for system init.

[Christoph Lameter <clameter@sgi.com>]

On Fri, 8 Jun 2007, Paul Mundt wrote:

> > I think we could do better by constructing a custom zonelist but that will 
> > be even more special casing.
> > 
> I don't know if a custom zonelist is worth the trouble. For the common
> asymmetric case, you could at least infer that ZONE_NORMAL is the only
> thing populated per node (well, small nodes other than node 0). If you
> mean just creating the zonelist from the range of allowable SLUB nodes,
> that could work.

Well that is quit difficult because of the other constraints on the alloc. 
The allocation must consider the cpuset context and the memory policies of 
the task (which may need special casing already there for interleave). 
Maybe we can determine from those restrictions a zonelist. Then we need to 
kick out the zones belonging to the illegal nodes from that zonelist.  
Then pass that to __alloc_pages to perform the alloc.

Looks like we are heading for a new alloc function

alloc_pages_node_not_nodes(order, gfpmask, node, forbidden-nodes)

But may be the hack of just going to node 0 on a problem is enough???

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