Re: [PATCH] Fix fake numa on ppc

From: David Rientjes
Date: Wed Sep 02 2009 - 02:03:43 EST

On Wed, 2 Sep 2009, Benjamin Herrenschmidt wrote:

> Since I'm pretty sure there could be CPU less nodes just like there
> could be memory-less nodes, it would be good if fake numa could
> simulate them too :-)

You don't want to simulate cpu less nodes since they do have affinity to
ranges of memory, you want to map each fake node to a cpumask including
all cpus with affinity to its memory, map each cpu to one fake node (with
memory) that it has physical affinity to, and then give all fake nodes
local NUMA distance to those on the same physical node. Memoryless nodes
take care of themselves since they rely purely on node_distance(), so the
index into the slit for all fake nodes to those without memory will be the
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at