Re: [PATCH] Fake NUMA emulation for PowerPC

On Sat, 8 Dec 2007, Balbir Singh wrote:

quoted

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