linux-kernel - Re: [RFC PATCH v9 7/7] perf test: Add test for Intel TPEBS counting mode

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Date: Fri, 24 May 2024 16:24:04 -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 v9 7/7] perf test: Add test for Intel TPEBS counting mode

On Tue, May 21, 2024 at 10:40 AM <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.
>
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
>  .../perf/tests/shell/test_stat_intel_tpebs.sh | 27 +++++++++++++++++++
>  1 file changed, 27 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..4cb749d84367
> --- /dev/null
> +++ b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> @@ -0,0 +1,27 @@
> +#!/bin/sh
> +# test Intel TPEBS counting mode
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set e
> +err=0
> +
> +# Use this event for testing because it should exist in all platforms
> +e=cache-misses:R
> +
> +# Without this cmd option, default value or zero is returned
> +echo "Testing without --enable-tpebs-recording"
> +result=$(perf stat -e "$e" true 2>&1)
> +[[ "$result" =~ "$e" ]] && err=0 || err=1
> +
> +if [[ "$err" == 1 ]]
> +then
> +       exit "$err"
> +fi

Probably you can just do

[[ "$result" =~ "$e" ]] || exit 1


> +
> +# In platforms that do not support TPEBS, it should execute without error.
> +echo "Testing with --enable-tpebs-recording"
> +result=$(perf stat -e "$e" --enable-tpebs-recording -a sleep 0.01 2>&1)
> +[[ "$result" =~ "perf record" && "$result" =~ "$e" ]] && err=0 || err=1

Ditto.

Thanks,
Namhyung


> +
> +
> +exit "$err"
> --
> 2.43.0
>