perf python: Add support to access tracepoint fields [LWN.net]

From:		Jiri Olsa <jolsa@kernel.org>
To:		Arnaldo Carvalho de Melo <acme@kernel.org>
Subject:		[PATCH 00/10] perf python: Add support to access tracepoint fields
Date:		Sun, 10 Jul 2016 13:07:52 +0200
Message-ID:		<1468148882-10362-1-git-send-email-jolsa@kernel.org>
Cc:		lkml <linux-kernel@vger.kernel.org>, David Ahern <dsahern@gmail.com>, Ingo Molnar <mingo@kernel.org>, Namhyung Kim <namhyung@kernel.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>
Archive‑link:		Article

hi,
adding support to access tracepoint fields in python scripts.

With this patchset it's possible to access tracepoint fields
in event python object like:

  print "time %u prev_comm=%s prev_pid=%d prev_prio=%d prev_state=0x%x ==> next_comm=%s next_pid=%d next_prio=%d" % (
         event.sample_time,
         event.prev_comm,
         event.prev_pid,
         event.prev_prio,
         event.prev_state,
         event.next_comm,
         event.next_pid,
         event.next_prio)

Also available in:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/fixes

thanks,
jirka


---
Jiri Olsa (10):
      perf tools: Make perf_evlist__event2evsel public
      perf tools: Introduce trace_event__tp_format_id function
      perf python: Init perf_event_attr::size in perf.evsel constructor
      perf python: Fix pyrf_evlist__read_on_cpu event consuming
      perf python: Put perf.event objects into dictionary
      perf python: Add perf.tracepoint method
      perf python: Add struct evsel into struct pyrf_event
      perf python: Add support to resolve tracepoint fields
      perf python: Add tracepoint example
      perf script python: Fix string vs byte array resolving

 tools/perf/python/tracepoint.py                        |  47 ++++++++++++++++++++++
 tools/perf/util/evlist.c                               |   4 +-
 tools/perf/util/evlist.h                               |   3 ++
 tools/perf/util/python.c                               | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 tools/perf/util/scripting-engines/trace-event-python.c |  34 +++++++++++++---
 tools/perf/util/trace-event.c                          |   9 +++++
 tools/perf/util/trace-event.h                          |   2 +
 7 files changed, 250 insertions(+), 11 deletions(-)
 create mode 100755 tools/perf/python/tracepoint.py