Re: [PATCH -V8 02/10] mm/numa: automatically generate node migration order

[Dave Hansen]

On 6/21/21 6:14 PM, Huang, Ying wrote:
>> In our P9+volta system, GPU memory is exposed as a NUMA node.
>> For the GPU workloads with data size greater than GPU memory size,
>> it will be very helpful to allow pages in GPU memory to be migrated/demoted
>> to CPU memory. With your current assumption, GPU memory -> CPU memory
>> demotion seems not possible, right? This should also apply to any
>> system with a device memory exposed as a NUMA node and workloads running
>> on the device and using CPU memory as a lower tier memory than the device
>> memory.
> Thanks a lot for your use case!  It appears that the demotion path
> specified by users is one possible way to satisfy your requirement.  And
> I think it's possible to enable that on top of this patchset.  But we
> still have no specific plan to work on that at least for now.

In other words, patches to make adapt this to your use case would be
most welcome!