[PATCH v2 07/10] mm/memory_hotplug: Introduce offline_and_remove_memory()

David Hildenbrand
Wed, 11 Mar 2020 17:19:04 -0000

On 11.03.20 18:14, David Hildenbrand wrote:
> virtio-mem wants to offline and remove a memory block once it unplugged
> all subblocks (e.g., using alloc_contig_range()). Let's provide
> an interface to do that from a driver. virtio-mem already supports to
> offline partially unplugged memory blocks. Offlining a fully unplugged
> memory block will not require to migrate any pages. All unplugged
> subblocks are PageOffline() and have a reference count of 0 - so
> offlining code will simply skip them.
>
> All we need is an interface to offline and remove the memory from kernel
> module context, where we don't have access to the memory block devices
> (esp. find_memory_block() and device_offline()) and the device hotplug
> lock.
>
> To keep things simple, allow to only work on a single memory block.
>

Lost the ACK from Michael

Acked-by: Michal Hocko <mhocko at suse.com> [1]

[1] https://lkml.kernel.org/r/20200302142737.GP4380 at dhcp22.suse.cz

--
Thanks,

David / dhildenb