Re: [RFC] [PATCH] more support for memory-less-node.

[Martin J. Bligh]

Andi Kleen wrote:
> > Your description of the node is correct, it's an arbitrary container of
> > one or more resources. Not only is this definition flexible, it's also
> > very useful, for memory hotplug, odd types of NUMA boxes, etc.
>
> I must disagree here. Special cases are always dangerous especially
> if they are hard to regression test. I made this discovery the hard
> way on x86-64 ... It's best to eliminate them in the first place,
> otherwise they will later come back and bite you when you don't expect it.
>
> Adding NULL tests all over mm for this would seem like a clear case
> of this to me.

I wasn't suggesting having NULL pointers for pgdats, if that's what you
mean. Just nodes with no memory in them, the pgdat would still be there.
pgdat = struct node, except everything's badly named.


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