On Wed, Mar 11, 2020 at 06:19:04PM +0100, David Hildenbrand wrote: > 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@xxxxxxxx> [1] > > [1] https://lkml.kernel.org/r/20200302142737.GP4380@xxxxxxxxxxxxxx Andrew, could you pls ack merging this through the vhost tree, with the rest of the patchset? > -- > Thanks, > > David / dhildenb
