[PATCH v3] Support CPU-list parsing in xentrace.

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

Hey George and Ian,

Since v2 (http://lists.xen.org/archives/html/xen-devel/2014-06/msg01835.html)
I've modified it per the reviews I've received. Hopefully this is the
last round of reviews :-)

The purpose of these patches is  to allow users of xentrace to narrow
down a specific CPU without having to figure out a bit mask. They
fix the limitation of the bit mask which is it can only do up to 32-bits
- which on large machines (say 120CPUs), you can't selectively trace anything
past 32CPUs.

The code expands the -c parameter where you can do -c <starting cpu>-<end cpu>
or -c <cpu1>,<cpu2> or a combination of them. This along with 'xl vcpu-list'
makes it extremely easy to trace a specific guest (if pinned).

You can still use the -c 0x<some hex value> option if you prefer.

 tools/libxc/xc_tbuf.c     |   26 ++++--
 tools/libxc/xenctrl.h     |    7 ++-
 tools/xentrace/xentrace.8 |   21 ++++-
 tools/xentrace/xentrace.c |  221 +++++++++++++++++++++++++++++++++++++++++----
 4 files changed, 244 insertions(+), 31 deletions(-)

Konrad Rzeszutek Wilk (2):
      libxc/xentrace: Replace xc_tbuf_set_cpu_mask with CPU mask with xc_cpumap_t instead of uint32_t
      xentrace: Implement cpu mask range parsing of human values (-c).