Michael Bringmann <m...@linux.vnet.ibm.com> writes:
> On 05/24/2017 06:19 AM, Michael Ellerman wrote:
>> Michael Bringmann <m...@linux.vnet.ibm.com> writes:
>>>
>>> With or without 3af229f2071f, we would still need to add something,
>>> somewhere to add new
>>> bits to the 'node_possible_map'. That is not being done.
>>
>> You mustn't add bits to the possible map after boot.
>>
>> That's its purpose, to tell you what nodes could ever *possibly* exist.
>
> The problem that I have been encountering is that the 'possible map' did *not*
> show all of the possible nodes.
OK so how did that happen?
The commit message for 3af229f2071f says:
In practice, we never see a system with 256 NUMA nodes, and in fact, we
do not support node hotplug on power in the first place, so the nodes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
that are online when we come up are the nodes that will be present for
the lifetime of this kernel.
Is that no longer true?
cheers
