Re: [PATCH] Add populated_map to account for memoryless nodes

[Christoph Lameter <clameter@sgi.com>]

On Tue, 12 Jun 2007, Nishanth Aravamudan wrote:

> > Mea culpa.  Our platforms have a [pseudo-]node with just O(1G) memory
> > all in zone DMA.  That node can't look populated for allocating huge
> > pages.
> 
> Because you don't want to use up any of the DMA pages, right? That seems
> *very* platform specific. And it doesn't seem right to make common code
> more complicated for one platform. Maybe there isn't a better solution,
> but I'd like to mull it over.

Right. Please Lee be generic and avoid the exceptional cases.

> > Maybe we can just exclude zone DMA from the populated map?
> 
> Maybe I don't know enough about NUMA and such, but I'm not sure I
> understand how this would make it a populated map anymore?
> 
> Maybe we need two maps, really?

No need. If you want to exclude a node from huge pages then you need 
to use the patch that allows per node huge page specifications and set 
the number of huge pages for that node to zero.

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