Re: [PATCH 1/2] Generic Virtual Memmap suport for SPARSEMEM

[Dave Hansen]

On Mon, 2007-04-02 at 14:53 -0700, Christoph Lameter wrote:
> > > Well think about how to handle the case that the allocatiopn of a page 
> > > table page or a vmemmap block fails. Once we have that sorted out then we 
> > > can cleanup the higher layers.
> > 
> > I think it is best to just completely replace
> > sparse_early_mem_map_alloc() for the vmemmap case.  It really is a
> > completely different beast.  You'd never, for instance, have
> > alloc_remap() come into play.
> 
> What is the purpose of alloc_remap? Could not figure that one out.

That's what we use on i386 to get some lowmem area for non-zero NUMA
nodes.  Otherwise, all of ZONE_NORMAL is on node 0.  It's a bit hokey,
and stuff like virt_to_phys() probably doesn't work on it, but it has
worked pretty well for a long time.  

-- Dave

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