[libvirt] [RFC] New libvirt API for domain memory statistics reporting

When using ballooning to manage overcommitted memory on a host, a system for guests to communicate their memory usage to the host can provide information that will minimize the impact of ballooning on the guests while maximizing efficient use of host memory. The design of such a communication channel was recently added to version 0.8.2 of the VirtIO Spec (See Appendix G): - http://ozlabs.org/~rusty/virtio-spec/virtio-spec-0.8.2.pdf Host-side and guest-side implementations have been accepted for inclusion in their respective projects: - Guest: http://lkml.org/lkml/2009/11/30/274 - Host: http://lists.gnu.org/archive/html/qemu-devel/2009-12/msg00380.html The following patch series implements a new libvirt interface to expose these memory statistics. Thank you for your review and comments. [PATCH 1/6] domMemStats: Add domainMemStats method to struct _virDriver [PATCH 2/6] domMemStats: Add public symbol to libvirt API [PATCH 3/6] qemu-driver: Enable domainMemStats in the qemu driver [PATCH 4/6] remote-driver: Add domainMemStats support [PATCH 5/6] virsh: Enable virDomainMemStats as a new command [PATCH 6/6] python: Add python bindings for virDomainMemStats