Messages in this thread |  | | | Date | Tue, 13 Feb 2007 17:38:30 +0900 | | From | KAMEZAWA Hiroyuki <> | | Subject | Re: [RFC] [PATCH] more support for memory-less-node. |
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On Tue, 13 Feb 2007 09:29:49 +0100 Andi Kleen <andi@firstfloor.org> wrote:
> > > In my understanding, a "node" is a block of cpu, memory, devices. > > and there could be cpu-only-node, memory-only-node, device-only-node... > > The trouble with this is that you'll need to harden large parts > of code against these. Especially a NULL pgdat is something quite > dangerous. You could make it a dummy empty pgdat, but just assigning it > nearby seems easier.
Ah...It seems I didn't explain enough.
Now, memorly-less-node has its own pgdat, for its own zonelist. All *online* node has its own NODA_DATA(nid).
NOD_DATA(nid) is always valid pointer if a node is online. NODE_DATA(nid)->present_pages can be 0 even if a node is online, I call this as memory-less-node.
Thanks, -Kame
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