Re: [RFC PATCH] memory,memory_hotplug: allow restricting memory blocks to zone movable

[Gregory Price]

On Tue, Jan 06, 2026 at 07:38:54PM +0100, David Hildenbrand (Red Hat) wrote:
> On 1/6/26 19:06, Gregory Price wrote:
> > On Tue, Jan 06, 2026 at 06:52:11PM +0100, David Hildenbrand (Red Hat) wrote:
> > > On 1/6/26 17:58, Gregory Price wrote:
> > 
> > Fair, I'll revist this once Hannes gets a chance to chime in.
> > 
> > This was effective at getting the discussion started though :P
> 
> Hehe, yes.
> 
> Another thing to look into would be to provide a way for ndctl to just
> add+online the memory in one shot, without having to go back to walking
> memory blocks to online them etc.
>

I think it's the opposite: offline+remove needing to be done in one step
while holding the hotplug lock.  Right now, I think you have to do
something like

daxctl offline-memory ...
daxctl destroy ...

You can't destroy and have it offline the memory for you in one go IIRC.

Maybe that's the ACTUAL fix here?

~Gregory