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

[Srikar Dronamraju]

* Michal Hocko <mhocko@xxxxxxxx> [2020-08-18 09:37:12]:

> On Tue 18-08-20 09:32:52, David Hildenbrand wrote:
> > On 12.08.20 08:01, Srikar Dronamraju wrote:
> > > Hi Andrew, Michal, David
> > > 
> > > * Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [2020-08-06 21:32:11]:
> > > 
> > >> On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> 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.
> > >>>>
> > >> 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;
> 
> Agreed. That would be a safer option.

Okay, will send arch specific v6 version.

> -- 
> Michal Hocko
> SUSE Labs

-- 
Thanks and Regards
Srikar Dronamraju