On Fri, 7 Feb 2014, Joonsoo Kim wrote:

quoted

It seems like a better approach would be to do this when a node is brought
online and determine the fallback node based not on the zonelists as you
do here but rather on locality (such as through a SLIT if provided, see
node_distance()).

Hmm...
I guess that zonelist is base on locality. Zonelist is generated using
node_distance(), so I think that it reflects locality. But, I'm not expert
on NUMA, so please let me know what I am missing here :)

The next node can be found by going through the zonelist of a node and
checking for available memory. See fallback_alloc().

There is a function node_distance() that determines the relative
performance of a memory access from one to the other node.
The building of the fallback list for every node in build_zonelists()
relies on that.

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