[Qemu-devel] [RFC PATCH v5 00/14] Tracing Improvements, Simpletrace v2

[Harsh Prateek Bora <harsh@linux.vnet.ibm.com>]

This patchset introduces 2 major updates:

1) Tracetool Improvements (Conversion from shell script to python)
2) Simpletrace v2 log format (Support for variable args, strings)

Existing simple trace can log upto 6 args per trace event and does not
support strings in trace record format. Introducing new trace format as
discussed earlier on list to support variable number/size of arguments.
Basic testing of new tracelog format is successful. Stress testing not yet
done.

Apply patches, then run:

make distclean
./configure with --enable-trace-backend=simple
make
sudo make install

Sample tracelog showing strings support:
[harsh@harshbora v9fs]$ scripts/simpletrace.py trace-events trace-23261
v9fs_version 0.000 tag=65535 id=100 msize=8192 version=9P2000.L
v9fs_version_return 17.530 tag=65535 id=100 msize=8192 version=9P2000.L
v9fs_attach 180.121 tag=1 id=104 fid=0 afid=18446744073709551615
uname=nobody aname=

Note: Other backends are only compile tested.

Version History:
v5:
- trace/simple.c: Introduced new struct TraceRecordHeader for log header
  consistency
- Addressed Stefan's review comments for scripts/simpletrace.py

v4:
- Addressed Stefan's review comments for tracetool, trace/simple.*
- Adressed Fast producer, Slow consumer problem
- Isolated tracetool python conversion patch from simpletrace v2 changes.
- Included improvements and fixes from Lluis Vilanova
TODO: Update simpletrace.py for simpletrace v2 log format.

v3:
- Added support for LTTng ust trace backend in tracetool.py

v2:
- Updated tracetool.py to support nop, stderr, dtrace backend

v1:
- Working protoype with tracetool.py converted only for simpletrace backend

Harsh Prateek Bora (4):
  Converting tracetool.sh to tracetool.py
  monitor: remove unused do_info_trace
  Simpletrace v2: Handle var num of args, strings.
  scripts/simpltrace.py changes

Lluís Vilanova (10):
  trace: [tracetool] Do not rebuild event list in backend code
  trace: [tracetool] Simplify event line parsing
  trace: [tracetool] Do not precompute the event number
  trace: [tracetool] Add support for event properties
  trace: [tracetool] Process the "disable" event property
  trace: [tracetool] Rewrite event argument parsing
  trace: [tracetool] Make format-specific code optional with access to
    events
  trace: [tracetool] Automatically establish available backends and
    formats
  trace: Provide a per-event status define for conditional compilation
  trace: [tracetool] Add error-reporting functions

 Makefile.objs          |    6 +-
 Makefile.target        |   13 +-
 configure              |    7 +-
 docs/tracing.txt       |   50 ++++-
 monitor.c              |   16 --
 scripts/simpletrace.py |  139 ++++++++----
 scripts/tracetool      |  643 ------------------------------------------------
 scripts/tracetool.py   |  635 +++++++++++++++++++++++++++++++++++++++++++++++
 trace/simple.c         |  238 ++++++++++--------
 trace/simple.h         |   38 +++-
 10 files changed, 954 insertions(+), 831 deletions(-)
 delete mode 100755 scripts/tracetool
 create mode 100755 scripts/tracetool.py