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

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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






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