Messages in this thread | | | Date | Thu, 16 Nov 2006 09:59:45 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory |
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On Wed, 15 Nov 2006 14:51:26 -0800 (PST) Christoph Lameter <clameter@sgi.com> 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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