On Fri, 7 Feb 2014, Joonsoo Kim wrote: > > > > 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>