Re: [PATCH 03/10] mm/migrate: update node demotion order during on hotplug events

[David Hildenbrand]

On 12.04.21 09:19, Oscar Salvador wrote:
> On Fri, Apr 09, 2021 at 08:59:21PM +0200, David Hildenbrand wrote:
>   
> > The only way to add more System RAM is via add_memory() and friends like
> > add_memory_driver_managed(). These all require CONFIG_MEMORY_HOTPLUG.
>
> Yeah, my point was more towards whether PMEM can come in a way that it does
> not have to be hotplugged, but come functional by default (as RAM).
> But after having read all papers out there, I do not think that it is possible.

You mean e.g., configuring in the BIOS/firmware how an NVDIMM will get 
exposed to the OS (pmem vs. RAM). I once heard something about that, not 
sure if it's real. But from Linux' perspective, it would simply be 
System RAM and it would get treated like that.

--
Thanks,

David / dhildenb