[Qemu-devel] [PATCH v3 0/4] trace: make systemtap easier to use for simple logging

[Daniel P . Berrangé]

This is a followup to

 v1: https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg04173.html
 v2: https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg04759.html

Changed in v3:

 - g_strndup the QXL log_buf before printing to avoid a race
   with guest removing the nul terminator (Stefan)
 - Add filtering of PIDs with "-p PID" arg to qemu-trace-stap
 - Add a man page for qemu-trace-stap (Eric)
 - Remove examples in docs/devel/tracing.txt and just refer
   people to the above man page.
 - Use strerror(errno) instead of raw errno in vfio traces (Eric/Alex)
 - Quote probe wildcards to be shell glob safe (Eric)
 - Mention explicitly that it is launched separately from QEMU (Eric)

Changed in v2:

 - Fix safety of QXL logging
 - Handle format specifier macros is a more reliable manner
 - Fix trace-events files missing newline
 - Remove use of %m formats

Daniel P. Berrangé (4):
  display: ensure qxl log_buf is a nul terminated string
  trace: enforce that every trace-events file has a final newline
  trace: forbid use of %m in trace event format strings
  trace: add ability to do simple printf logging via systemtap

 MAINTAINERS                          |   1 +
 Makefile                             |  10 ++
 Makefile.target                      |  11 +-
 docs/devel/tracing.txt               |   4 +
 hw/display/qxl.c                     |  14 ++-
 hw/display/trace-events              |   2 +-
 hw/gpio/trace-events                 |   2 +-
 hw/vfio/pci.c                        |   2 +-
 hw/vfio/trace-events                 |   2 +-
 scripts/qemu-trace-stap              | 174 +++++++++++++++++++++++++++
 scripts/qemu-trace-stap.texi         | 139 +++++++++++++++++++++
 scripts/tracetool/__init__.py        |   6 +
 scripts/tracetool/format/log_stap.py | 127 +++++++++++++++++++
 13 files changed, 485 insertions(+), 9 deletions(-)
 create mode 100755 scripts/qemu-trace-stap
 create mode 100644 scripts/qemu-trace-stap.texi
 create mode 100644 scripts/tracetool/format/log_stap.py

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2.20.1