On Wed, 15 Nov 2006 14:51:26 -0800 (PST)
Christoph Lameter <[email protected]> wrote:
> On Wed, 15 Nov 2006, Martin Bligh wrote:
>
> > Supposing we hot-unplugged all the memory in a node? Or seems to have
> > happened in this instance is boot with mem=, cutting out memory on that
> > node.
>
> So a node with no memory has a pgdat_list structure but no zones? Or empty
> zones?
>
The node has just empty-zone. pgdat/per-cpu-area is allocated on an other
(nearest) node.
I hear some vender's machine has this configuration. (ia64, maybe SGI or HP)
Node0: CPUx0 + XXXGb memory
Node1: CPUx2 + 16MB memory
Node2: CPUx2 + 16MB memory
memory of Node1 and Node2 is tirmmed at boot by GRANULE alignment.
Then, final view is
Node0 : memory-only-node
Node1 : cpu-only-node
Node2 : cpu-only-node.
-Kame
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