[Qemu-devel] [RFC PATCH v3 0/3] simpletrace : support var num of args and strings.

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

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.
(Ref: http://lists.gnu.org/archive/html/qemu-devel/2011-11/msg03426.html)

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:

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 (3):
  Converting tracetool.sh to tracetool.py
  simpletrace-v2: Handle variable number/size of elements per trace
    record.
  simpletrace.py: updated log reader script to handle new log format

 Makefile.objs          |    6 +-
 Makefile.target        |   10 +-
 configure              |    7 +-
 monitor.c              |    2 +-
 scripts/simpletrace.py |  109 ++++++++-
 scripts/tracetool      |  643 ------------------------------------------------
 scripts/tracetool.py   |  585 +++++++++++++++++++++++++++++++++++++++++++
 trace/simple.c         |  178 +++++---------
 trace/simple.h         |   31 ++-
 9 files changed, 783 insertions(+), 788 deletions(-)
 delete mode 100755 scripts/tracetool
 create mode 100755 scripts/tracetool.py