Re: [PATCH v2] Fix fake numa on ppc

On Thu, 3 Sep 2009, Balbir Singh wrote:

quoted

Right, I'm proposing an alternate mapping scheme (which we've used for
years) for both platforms such that a cpu is bound (and is set in
cpumask_of_node()) to each fake node with which it has physical affinity.
That is the only way for zonelist ordering in node order, task migration
from offlined cpus, correct sched domains, etc.  I can propose a patchset
for x86_64 to do exactly this if there aren't any objections and I hope
you'll help do ppc.

Sounds interesting, I'd definitely be interested in seeing your
proposal, but I would think of that as additional development on top
of this patch

Absolutely.  I'm not familiar with numa=fake on ppc, but if cpus are being 
bound to nodes with which they don't have affinity, it definitely warrants 
a fix such as this (although the initial value for fake_enabled looks 
wrong and fake_numa_node_mapping[] can be __cpuinitdata).  I'll cc you, 
Ben, and Ankita on the x86_64 patches.  Thanks.