linux-kernel - [PATCH 0/6] perf tools: Add wallclock time conversion support

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Date:   Thu, 30 Jul 2020 23:39:44 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Ahern <dsahern@...il.com>,
        Geneviève Bastien <gbastien@...satic.net>,
        Wang Nan <wangnan0@...wei.com>,
        Jeremie Galarneau <jgalar@...icios.com>
Subject: [PATCH 0/6] perf tools: Add wallclock time conversion support

hi,
this patchset is based on changes made by David Ahern long time ago.
The perf code moved a lot since then, but the idea is the same.

The patchset is adding the ability to display TOD/wallclock timestamp
in 'perf script' output and in 'perf data convert --to-ctf' subcommand,
so the converted CTF data contain TOD/wallclock timestamps.

It's done by adding new header FEATURE 'CLOCK_DATA' to perf.data, that
stores reference times for both TOD/wallclock time and for the clock that
perf record is configured to use. These reference times are then used to
convert sample's timestamps to TOD/wallclock timestamps.

The feature is available only for recording with clockid specified,
because it's the only case where we can get reference time to TOD/wallclock
time. We can't do that with perf clock yet.

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

thanks,
jirka


---
Jiri Olsa (6):
      perf tools: Add clockid_name function
      perf tools: Store clock references for -k/--clockid option
      perf tools: Move clockid_res_ns under clock struct
      perf tools: Add support to store time of day in CTF data conversion
      perf script: Change enum perf_output_field values to be 64 bits
      perf script: Add tod field to display time of day

 tools/perf/Documentation/perf-data.txt             |   3 ++
 tools/perf/Documentation/perf.data-file-format.txt |  13 +++++++
 tools/perf/builtin-data.c                          |   1 +
 tools/perf/builtin-record.c                        |  58 ++++++++++++++++++++++++++++--
 tools/perf/builtin-script.c                        | 195 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------
 tools/perf/util/data-convert-bt.c                  |  56 ++++++++++++++++++-----------
 tools/perf/util/data-convert.h                     |   1 +
 tools/perf/util/env.h                              |  14 +++++++-
 tools/perf/util/header.c                           | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 tools/perf/util/header.h                           |   1 +
 tools/perf/util/util.h                             |   2 ++
 11 files changed, 371 insertions(+), 93 deletions(-)