RESEND Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

[Balbir Singh]

On Wed, Jun 14, 2017 at 8:21 AM, Michael Bringmann <mwb at linux.vnet.ibm.com>
wrote:

> On a related note, we are discussing the addition of 2 new device-tree
> properties
> with Pete Heyrman and his fellows that should simplify the determination
> of the
> set of required nodes.
>
> * One property would provide the total/max number of nodes needed by the
> kernel
>   on the current hardware.
>

Yes, that would be nice to have


> * A second property would provide the total/max number of nodes that the
> kernel
>   could use on any system to which it could be migrated.
>
>
Not sure about this one, are you suggesting more memory can be added
depending on the migration target?



> These properties aren't available, yet, and it takes time to define new
> properties
> in the PAPR and have them implemented in pHyp and the kernel.  As an
> intermediary
> step, the systems which are doing a lot of dynamic hot-add/hot-remove
> configuration
> could provide equivalent information to the PowerPC kernel with a command
> line
> parameter.  The 'numa.c' code would then read this value and fill in the
> necessary
> entries in the 'node_possible_map'.
>
> Would you foresee any problems with using such a feature?
>


Balbir Singh
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