On Thu, May 25, 2017 at 04:19:53PM +1000, Michael Ellerman wrote:
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?
I don't know what the reasoning behind that statement was at the time,
but as far as I can tell, the only thing missing for node hotplug now is
Balbir's patchset [1]. He fixes the resource issue which motivated
3af229f2071f and reverts it.
With that set, I can instantiate a new numa node just by doing
add_memory(nid, ...) where nid doesn't currently exist.
[1]
https://lkml.kernel.org/r/1479253501-26261-1-git-send-email-bsinghar...@gmail.com
--
Reza Arbab
