tree 265cb770cf581da01049c6bc6acc696a03467411
parent de5a77d8422fc7ed0b2f4349bceb65a1a639e5b2
author David Vrabel <david.vrabel@citrix.com> 1435230628 +0100
committer David Vrabel <david.vrabel@citrix.com> 1445606404 +0100

xen/balloon: only hotplug additional memory if required

Now that we track the total number of pages (included hotplugged
regions), it is easy to determine if more memory needs to be
hotplugged.

Add a new BP_WAIT state to signal that the balloon process needs to
wait until kicked by the memory add notifier (when the new section is
onlined by userspace).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
v3:
- Return BP_WAIT if enough sections are already hotplugged.

v2:
- New BP_WAIT status after adding new memory sections.