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

[David Hildenbrand (Red Hat)]

> +/*
> + * Restrict hotplugged memory blocks to ZONE_MOVABLE only.
> + *
> + * During offlining of hotplugged memory which was originally onlined
> + * as ZONE_MOVABLE, userland services may detect blocks going offline
> + * and automatically re-online them into ZONE_NORMAL or lower.  When
> + * this happens it may become permanently incapable of being removed.

If it's really only that, we could also look into simply making a 
re-online without a specific mode ("online") to use the previous mode.

We could glue that to the "contig-zones" policy only, to not affect 
"auto-movable".

That is, remember the zone to which it was previously onlined, and then 
simply re-online to that one.

--
Cheers

David