[PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

[David Hildenbrand]

On 12.08.20 08:01, Srikar Dronamraju wrote:
> Hi Andrew, Michal, David
> 
> * Andrew Morton <akpm at linux-foundation.org> [2020-08-06 21:32:11]:
> 
>> On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju <srikar at linux.vnet.ibm.com> wrote:
>>
>>>> The memory hotplug changes that somehow because you can hotremove numa
>>>> nodes and therefore make the nodemask sparse but that is not a common
>>>> case. I am not sure what would happen if a completely new node was added
>>>> and its corresponding node was already used by the renumbered one
>>>> though. It would likely conflate the two I am afraid. But I am not sure
>>>> this is really possible with x86 and a lack of a bug report would
>>>> suggest that nobody is doing that at least.
>>>>
>>>
>>> JFYI,
>>> Satheesh copied in this mailchain had opened a bug a year on crash with vcpu
>>> hotplug on memoryless node. 
>>>
>>> https://bugzilla.kernel.org/show_bug.cgi?id=202187
>>
>> So...  do we merge this patch or not?  Seems that the overall view is
>> "risky but nobody is likely to do anything better any time soon"?
> 
> Can we decide on this one way or the other?

Hmm, not sure who's the person to decide. I tend to prefer doing the
node renaming, handling this in ppc code; looking at the review of v2
there are still some concerns regarding numa distances.

https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20200817103238.158133-1-aneesh.kumar@linux.ibm.com/

-- 
Thanks,

David / dhildenb