On 05/23/2017 10:52 AM, Reza Arbab wrote:
> On Tue, May 23, 2017 at 10:15:44AM -0500, Michael Bringmann wrote:
>> +static void setup_nodes(void)
>> +{
>> + int i, l = 32 /* MAX_NUMNODES */;
>> +
>> + for (i = 0; i < l; i++) {
>> + if (!node_possible(i)) {
>> + setup_node_data(i, 0, 0);
>> + node_set(i, node_possible_map);
>> + }
>> + }
>> +}
>
> This seems to be a workaround for 3af229f2071f ("powerpc/numa: Reset
> node_possible_map to only node_online_map").
They may be related, but that commit is not a replacement. The above patch
ensures that
there are enough of the nodes initialized at startup to allow for memory
hot-add into a
node that was not used at boot. (See 'setup_node_data' function in 'numa.c'.)
That and
recording that the node was initialized.
I didn't see where any part of commit 3af229f2071f would touch the
'node_possible_map'
which is needed by 'numa.c' and 'workqueue.c'. The nodemask created and
updated by
'mem_cgroup_may_update_nodemask()' does not appear to be the same mask.
>
> Balbir, you have a patchset which reverts it. Do you think that will be
> getting merged?
>
> http://lkml.kernel.org/r/1479253501-26261-1-git-send-email-bsinghar...@gmail.com
> (see patch 3/3)
>
--
Michael W. Bringmann
Linux Technology Center
IBM Corporation
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External: (512) 286-5196
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m...@linux.vnet.ibm.com
