Re: [PATCH v2 0/2] mm: Memory offlining + page isolation cleanups

[David Hildenbrand]

On 21.10.19 19:23, David Hildenbrand wrote:
> Two cleanups that popped up while working on (and discussing) virtio-mem:
>   https://lkml.org/lkml/2019/9/19/463
>
> Tested with DIMMs on x86.
>
> As discussed with michal in v1, I'll soon look into removing the use
> of PG_reserved during memory onlining completely - most probably
> disallowing to offline memory blocks with holes, cleaning up the
> onlining+offlining code.

BTW, I remember that ZONE_DEVICE pages are still required to be set 
PG_reserved. That has to be sorted out first. I remember that somebody 
was working on it a while ago but didn't hear about that again. Will 
look into that as well - should be as easy as adding a zone check (if 
there isn't a pfn_to_online_page() check already). But of course, there 
might be special cases ....


--

Thanks,

David / dhildenb