Re: [7/8,v3] NUMA Hotplug Emulator: extend memory probe interfaceto support NUMA

[David Rientjes]

On Thu, 18 Nov 2010, Shaohui Zheng wrote:

> > Then, export the amount of memory that is actually physically present in 
> > the e820 but was truncated by mem= and allow users to hot-add the memory 
> > via the probe interface.  Add a writeable 'node' file to offlined memory 
> > section directories and allow it to be changed prior to online.
> 
> for memory offlining, it is a known diffcult thing, and it is not supported 
> well in current kernel, so I do not suggest to provide the offline interface
> in the emulator, it just take more pains. We can consider to add it when
> the memory offlining works well.
> 

You're referring to the inability to remove memory sections for 
CONFIG_SPARSEMEM_VMEMMAP?  You should still able to test the offlining 
with other memory models of emulated nodes by using the generic support 
already implemented for CONFIG_MEMORY_HOTREMOVE; the short answer is that 
it probably shouldn't matter at all since we already support node 
hot-remove and the fact that they are emulated nodes isn't really of 
interest.
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