[Xen-devel] [PATCH v2] Support CPU-list parsing in xentrace.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

Hey George, Ian:

Since v1 posting 
(http://comments.gmane.org/gmane.comp.emulators.xen.devel/201962)
I've incorporated all the feedback I've received. If I missed
something - please remind me.

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.

Comments:

 [PATCH v2 1/4] xentrace: Use PERROR from xc_private. instead of our

is needed to use 'xc_private.h' instead of 'xc_bitops.h' in the xentrace.c
file. However, the

 [PATCH v2 2/4] libxc/xentrace: Replace xc_tbuf_set_cpu_mask with CPU

still needs the 'xc_bitops.h' for bit manipulations so the initial goal
of shuffling DIV_ROUND_UP to a different header had been meet - but we
still need to include the other header.

 [PATCH v2 3/4] libxc/tbuf: Use the xc_hypercall_bounce_[pre|post]

Can be squashed in the "2/4 libxc/xentrace: Replace xc_tbuf_set_cpu_mask
with CPU" if desired. However the 2/4 patch is busy enough that I was
a bit uncomfortable to squash it myself. Naturally if the maintainers
want it that way I will be thrilled to do it.

 tools/libxc/xc_private.h  |   2 +
 tools/libxc/xc_tbuf.c     |  28 +++--
 tools/libxc/xenctrl.h     |   2 +-
 tools/xentrace/xentrace.8 |  22 +++-
 tools/xentrace/xentrace.c | 266 ++++++++++++++++++++++++++++++++++++++++------
 5 files changed, 273 insertions(+), 47 deletions(-)

Konrad Rzeszutek Wilk (4):
      xentrace: Use PERROR from xc_private. instead of our own.
      libxc/xentrace: Replace xc_tbuf_set_cpu_mask with CPU mask with 
xc_cpumap_t instead of uint32_t
      libxc/tbuf: Use the xc_hypercall_bounce_[pre|post] instead of memcpy
      xentrace: Implement cpu mask range parsing of human values (-c).


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