Re: [RFC,5/7] NUMA hotplug emulator

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On Fri, May 07, 2010 at 04:11:42PM +0200, Pavel Machek wrote:
> Hi!
> 
> > hotplug emulator: Abstract cpu register functions
> > 
> > Abstract function arch_register_cpu and register_cpu, move the implementation
> > details to a sub function with prefix "__". 
> > 
> > each of the sub function has an extra parameter nid, it can be used to register
> > CPU under a fake NUMA node, it is a reserved interface for cpu hotplug emulation
> > (CPU PROBE/RELEASE) in x86.
> 
> I don't get it. CPU hotplug can already be tested using echo 0/1 >
> online, and that works on 386. How is this different?
> 
> It seems to add some numa magic. Why is it important?

My guess is that he wants to test the software surrounding NUMA on a
non-NUMA (or different-NUMA) machine, perhaps in order to shake out bugs
before the corresponding hardware is available.

							Thanx, Paul
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