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

[David Hildenbrand]

On 22.10.19 10:32, David Hildenbrand wrote:
> On 22.10.19 10:21, Michal Hocko wrote:
> > On Tue 22-10-19 10:15:07, David Hildenbrand wrote:
> > > On 22.10.19 10:08, Michal Hocko wrote:
> > > > On Tue 22-10-19 08:52:28, David Hildenbrand wrote:
> > > > > 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.
> > > >
> > > > Do they?
> > >
> > > Yes, especially KVM code :/
> >
> > Details please?

Oh, and I think you might be wondering "how can we have RAM without a 
memmap in the guest", see

https://lwn.net/Articles/778240/

--

Thanks,

David / dhildenb