[Xen-devel] [PATCHv3 00/10] mm, xen/balloon: memory hotplug improvements

[David Vrabel <david.vrabel@xxxxxxxxxx>]

The series improves the use of hotplug memory in the Xen balloon
driver.

- Reliably find a non-conflicting location for the hotplugged memory
  (this fixes memory hotplug in a number of cases, particularly in
  dom0).

- Use hotplugged memory for alloc_xenballooned_pages() (keeping more
  memory available for the domain and reducing fragmentation of the
  p2m).

Changes in v3:
- xen.balloon.hotplug_unpopulated sysctl to enable using hotplug to
  provide unpopulated (ballooned) pages.
- Fix xen_alloc_p2m_entry() for auto-translated guests.

Changes in v2:
- New BP_WAIT state to signal the balloon process to wait for
  userspace to online the new memory.
- Preallocate P2M entries in alloc_xenballooned_pages() so they do not
  need allocated later (in a context where GFP_KERNEL allocations are
  not possible).

David


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