[PATCH 0 of 5] Memory sharing overhaul part 2

[Andres Lagar-Cavilla <andres@lagarcavilla.org>]

(Sigh, the previous pachbomb got truncated by an smtp quota in my 
provider... remaining patches in this series)

This patch series proposes an overhaul of the memory sharing code.

Aside from bug fixes and cleanups, the main features are:
- Polling of stats via libxc, libxl and console
- Removal of global sharing hashtable and global sharing lock 
(if audit disabled)
- Turned sharing audits into a domctl
- New domctl to populate vacant physmap entries with shared 
pages.

As a result, the domctl interface to sharing changes. The only in-tree
consumer of this interface is updated in the current series. It is 
important that if any out-of-tree consumer exists, that they state
their opinion on this interface change.

Patches 5 to 8, 10, 11, 15 and 18 are tools patches.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Adin Scannell <adin@scannell.ca>

 xen/arch/x86/mm/mem_sharing.c |  106 ++++++++++++++++++++++++++++++++++++++++++
 xen/include/public/domctl.h   |    3 +-
 tools/libxc/xc_memshr.c       |   23 +++++++++
 tools/libxc/xenctrl.h         |    6 ++
 xen/arch/ia64/xen/mm.c        |    6 ++
 xen/arch/x86/mm/mem_sharing.c |    8 +++
 xen/common/keyhandler.c       |    7 +-
 xen/include/xen/mm.h          |    3 +
 xen/arch/x86/mm/mem_sharing.c |   17 ++++-
 xen/include/public/domctl.h   |    1 +
 tools/libxc/xc_memshr.c       |   14 +++++
 tools/libxc/xenctrl.h         |    2 +
 12 files changed, 188 insertions(+), 8 deletions(-)