[PATCH] Fake NUMA emulation for PowerPC

[David Rientjes]

On Sat, 8 Dec 2007, Balbir Singh wrote:

> > You're going to want to distribute the cpu's based on how they match up 
> > physically with the actual platform that you're running on.  x86_64 does 
> 
> Could you explain this better, how does it match up CPU's with fake NUMA
> memory? Is there some smartness there? I'll try and look at the code and
> also see what I can do for PowerPC
> 

numa_cpumask_lookup_table[] would return the correct cpumask for the fake 
node index.  Then all the code that uses node_to_cpumask() in generic 
kernel code like the scheduler and VM still preserve their true NUMA 
affinity that matches the underlying hardware.  I tried to make x86_64 
fake NUMA as close to the real thing as possible.

You also probably want to make all you changes dependent on 
CONFIG_NUMA_EMU like the x86_64 case.  That'll probably be helpful as you 
extend this tool more and more.

		David