[PATCH 0 of 5] Add credit2 scheduler (EXPERIMENTAL)

[George Dunlap <george.dunlap@eu.citrix.com>]

This patch series introduces the credit2 scheduler.  The first two patches
introduce changes necessary to allow the credit2 shared runqueue functionality
to work properly; the last two implement the functionality itself.

The scheduler is still in the experimental phase.  There's lots of 
opportunity to contribute with independent lines of development; email
George Dunlap <george.dunlap@eu.citrix.com> or check out the wiki page
http://wiki.xensource.com/xenwiki/Credit2_Scheduler_Development for ideas
and status updates.

19 files changed, 1453 insertions(+), 21 deletions(-)
tools/libxc/Makefile                      |    1 
tools/libxc/xc_csched2.c                  |   50 +
tools/libxc/xenctrl.h                     |    8 
tools/python/xen/lowlevel/xc/xc.c         |   58 +
tools/python/xen/xend/XendAPI.py          |    3 
tools/python/xen/xend/XendDomain.py       |   54 +
tools/python/xen/xend/XendDomainInfo.py   |    4 
tools/python/xen/xend/XendNode.py         |    4 
tools/python/xen/xend/XendVMMetrics.py    |    1 
tools/python/xen/xend/server/SrvDomain.py |   14 
tools/python/xen/xm/main.py               |   82 ++
xen/arch/ia64/vmx/vmmu.c                  |    6 
xen/common/Makefile                       |    1 
xen/common/sched_credit.c                 |    8 
xen/common/sched_credit2.c                | 1125 +++++++++++++++++++++++++++++
xen/common/schedule.c                     |   22 
xen/include/public/domctl.h               |    4 
xen/include/public/trace.h                |    1 
xen/include/xen/sched-if.h                |   28