linux-kernel - [PATCH V2 0/6] perf intel-pt: Support itrace option flag d+e to log on error

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Date:   Mon,  5 Sep 2022 10:34:18 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH V2 0/6] perf intel-pt: Support itrace option flag d+e to log on error

Hi

Here are a few patches to add the ability to output the decoding debug log
only when there are decoding errors.

This is motivated by the fact that a full log can be very large, so just
getting interesting bits is useful for analyzing errors.

If necessary, the size of output on error is configurable via perf config,
and perf_config_scan() was added in the 1st patch to make that simpler.

The 2nd patch adds the new option flag to auxtrace.

There are a couple of very minor and essentially unrelated changes in
patches 3 and 4.

The main Intel PT change is in patch 5 and there is a small example in the
commit message.


Changes in V2:

      perf intel-pt: Support itrace option flag d+e to log on error
	Ensure log_buf is defined before use

      perf intel-pt: Remove first line of log dumped on error
	Remove first line only if the buffer has wrapped


Adrian Hunter (6):
      perf tools: Add perf_config_scan()
      perf auxtrace: Add itrace option flag d+e to log on error
      perf intel-pt: Improve man page layout slightly
      perf intel-pt: Improve object code read error message
      perf intel-pt: Support itrace option flag d+e to log on error
      perf intel-pt: Remove first line of log dumped on error

 tools/perf/Documentation/itrace.txt             |   1 +
 tools/perf/Documentation/perf-config.txt        |   7 ++
 tools/perf/Documentation/perf-intel-pt.txt      |  13 ++-
 tools/perf/util/auxtrace.c                      |  13 +++
 tools/perf/util/auxtrace.h                      |   3 +
 tools/perf/util/config.c                        |  31 +++++++
 tools/perf/util/config.h                        |   1 +
 tools/perf/util/intel-pt-decoder/intel-pt-log.c | 117 +++++++++++++++++++++++-
 tools/perf/util/intel-pt-decoder/intel-pt-log.h |   3 +-
 tools/perf/util/intel-pt.c                      |  23 ++++-
 10 files changed, 206 insertions(+), 6 deletions(-)


Regards
Adrian