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

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, 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 tests a different code path.

> It seems to add some numa magic. Why is it important?

It tests memory and node hotadd too. Memory/node hotadd is a quite problematic
feature and needs all the testing support it can get.

-Andi


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