linux-kernel - Re: [RFC PATCH v17 8/8] perf test: Add test for Intel TPEBS counting mode

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Message-ID: <ZpirYuwlzSv2ubHN@google.com>
Date: Wed, 17 Jul 2024 22:42:58 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: weilin.wang@...el.com
Cc: Ian Rogers <irogers@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Perry Taylor <perry.taylor@...el.com>,
	Samantha Alt <samantha.alt@...el.com>,
	Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [RFC PATCH v17 8/8] perf test: Add test for Intel TPEBS counting
 mode

Hello,

On Fri, Jul 12, 2024 at 03:09:30PM -0400, weilin.wang@...el.com wrote:
> From: Weilin Wang <weilin.wang@...el.com>
> 
> Intel TPEBS sampling mode is supported through perf record. The counting mode
> code uses perf record to capture retire_latency value and use it in metric
> calculation. This test checks the counting mode code on Intel platforms.
> 
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
>  .../perf/tests/shell/test_stat_intel_tpebs.sh | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100755 tools/perf/tests/shell/test_stat_intel_tpebs.sh
> 
> diff --git a/tools/perf/tests/shell/test_stat_intel_tpebs.sh b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> new file mode 100755
> index 000000000000..773fcc5c35d6
> --- /dev/null
> +++ b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> @@ -0,0 +1,19 @@
> +#!/bin/bash
> +# test Intel TPEBS counting mode
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +grep -q GenuineIntel /proc/cpuinfo || { echo Skipping non-Intel; exit 0; }

You should exit with 2 when skipping the test.

Thanks,
Namhyung

> +
> +# Use this event for testing because it should exist in all platforms
> +event=cache-misses:R
> +
> +# Without this cmd option, default value or zero is returned
> +echo "Testing without --record-tpebs"
> +result=$(perf stat -e "$event" true 2>&1)
> +[[ "$result" =~ $event ]] || exit 1
> +
> +# In platforms that do not support TPEBS, it should execute without error.
> +echo "Testing with --record-tpebs"
> +result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
> +[[ "$result" =~ "perf record" && "$result" =~ $event ]] || exit 1
> -- 
> 2.43.0
>