linux-kernel - Re: [PATCH v2 0/7] perf: cs-etm: Coresight decode and disassembly improvements

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Message-ID: <ZuM_oMuODcF0WVza@x1>
Date: Thu, 12 Sep 2024 16:23:12 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: James Clark <james.clark@...aro.org>
Cc: linux-perf-users@...r.kernel.org, gankulkarni@...amperecomputing.com,
	coresight@...ts.linaro.org, leo.yan@....com,
	scclevenger@...amperecomputing.com,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	Leo Yan <leo.yan@...ux.dev>, Ben Gainey <ben.gainey@....com>,
	Ruidong Tian <tianruidong@...ux.alibaba.com>,
	Benjamin Gray <bgray@...ux.ibm.com>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/7] perf: cs-etm: Coresight decode and disassembly
 improvements

On Thu, Sep 12, 2024 at 04:11:31PM +0100, James Clark wrote:
> A set of changes that came out of the issues reported here [1].
> 
>  * First 2 patches fix a decode bug in Perf and add support for new
>    consistency checks in OpenCSD
>  * The remaining ones make the disassembly script easier to test
>    and use. This also involves adding a new Python binding to
>    Perf to get a config value (perf_config_get())
> 
> [1]: https://lore.kernel.org/linux-arm-kernel/20240719092619.274730-1-gankulkarni@os.amperecomputing.com/

Looks ok from a quick look, but I can't test it, so since there are
reporters for problems that are being fixed, it would be great to have a
Tested-by: from the reporters and probably from someone with access to
the hardware where this can be tested.

- Arnaldo
 
> Changes since V1:
>   * Keep the flush function for discontinuities
>   * Still remove the flush when the buffer fills, but now add
>     cs_etm__end_block() for the end trace. That way we won't drop
>     the last branch stack if the instruction sample period wasn't
>     hit at the very end.
> 
> James Clark (7):
>   perf cs-etm: Don't flush when packet_queue fills up
>   perf cs-etm: Use new OpenCSD consistency checks
>   perf scripting python: Add function to get a config value
>   perf scripts python cs-etm: Update to use argparse
>   perf scripts python cs-etm: Improve arguments
>   perf scripts python cs-etm: Add start and stop arguments
>   perf test: cs-etm: Test Coresight disassembly script
> 
>  .../perf/Documentation/perf-script-python.txt |   2 +-
>  .../scripts/python/Perf-Trace-Util/Context.c  |  11 ++
>  .../scripts/python/arm-cs-trace-disasm.py     | 109 +++++++++++++-----
>  .../tests/shell/test_arm_coresight_disasm.sh  |  63 ++++++++++
>  tools/perf/util/config.c                      |  22 ++++
>  tools/perf/util/config.h                      |   1 +
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.c |   7 +-
>  tools/perf/util/cs-etm.c                      |  25 ++--
>  8 files changed, 205 insertions(+), 35 deletions(-)
>  create mode 100755 tools/perf/tests/shell/test_arm_coresight_disasm.sh
> 
> -- 
> 2.34.1