Re: [patch 1/2] x86: add numa=possible command line option

[David Rientjes]

On Sun, 21 Nov 2010, AmÃrico Wang wrote:

> I am not sure how much value of making this dynamic,
> for CPU, we do this at compile time, i.e. NR_CPUS,
> so how about NR_NODES?
> 

This is outside the scope of node hotplug emulation, it needs to be built 
on top of whatever the kernel implements.

> Also, numa=possible= is not as clear as numa=max=, for me at least.
> 

I like name, but it requires that you know how many nodes that system 
already has.  In other words, numa=possible=4 allows you to specify that 4 
additional nodes will be possible, but initially offline, for this or 
other purposes.  numa=max=4 would be no-op if the system actually had 4 
nodes.

I chose numa=possible over numa=additional because it is more clearly tied 
to node_possible_map, which is the only thing it modifies.