linux-kernel - Re: [PATCH 3/3] perf test: Add basic perf record tests

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Date:   Wed, 13 Apr 2022 13:13:06 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Alexey Bayduraev <alexey.bayduraev@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/3] perf test: Add basic perf record tests

Hi Ian,

On Mon, Apr 11, 2022 at 11:21 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Test the --per-thread flag.
> Test Intel machine state capturing.

Probably we want to add more later..

>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/shell/record.sh | 37 ++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100755 tools/perf/tests/shell/record.sh
>
> diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> new file mode 100755
> index 000000000000..2c85e73a0af4
> --- /dev/null
> +++ b/tools/perf/tests/shell/record.sh
> @@ -0,0 +1,37 @@
> +#!/bin/sh
> +# perf record tests
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +
> +err=0
> +test_per_thread() {
> +  echo "Basic --per-thread mode test"
> +  perf record -o - --per-thread true | perf report -i - > /dev/null

I think it should check the output of the perf report.
The current code produces no samples..

  $ perf record --per-thread -o- true | perf report -i- -q
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
  Error:
  The - data has no samples!

We can just grep 'true' in the comm.

Thanks,
Namhyung


> +  echo "Basic --per-thread mode test [Success]"
> +}
> +
> +test_register_capture() {
> +  echo "Register capture test"
> +  if ! perf list | egrep -q 'br_inst_retired.near_call'
> +  then
> +    echo "Register capture test [Skipped missing instruction]"
> +    return
> +  fi
> +  if ! perf record --intr-regs=\? 2>&1 | egrep -q 'available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15'
> +  then
> +    echo "Register capture test [Skipped missing registers]"
> +    return
> +  fi
> +  if ! perf record -o - --intr-regs=di,r8,dx,cx -e cpu/br_inst_retired.near_call/p -c 1000 --per-thread true | perf script -F ip,sym,iregs  -i - | egrep -q "DI:"
> +  then
> +    echo "Register capture test [Failed missing output]"
> +    err=1
> +    return
> +  fi
> +  echo "Register capture test [Success]"
> +}
> +
> +test_per_thread
> +test_register_capture
> +exit $err
> --
> 2.35.1.1178.g4f1659d476-goog
>