Re: [Qemu-devel] [PATCH v4 0/4] trace: make systemtap easier to use for simple logging

[Stefan Hajnoczi]

On Wed, Jan 23, 2019 at 12:00:12PM +0000, Daniel P. Berrangé wrote:
> 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
>  v3: https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg05477.html
> 
> Changed in v4:
> 
>  - Fix license to be GPLv2-or-later (Eric)
>  - Misc typo fixes (Eric)
> 
> 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              | 175 +++++++++++++++++++++++++++
>  scripts/qemu-trace-stap.texi         | 140 +++++++++++++++++++++
>  scripts/tracetool/__init__.py        |   6 +
>  scripts/tracetool/format/log_stap.py | 127 +++++++++++++++++++
>  13 files changed, 487 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
> 
> -- 
> 2.20.1
> 

Thanks, applied to my tracing tree:
https://github.com/stefanha/qemu/commits/tracing

Stefan

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