linux-kernel - Re: [PATCH 1/6] perf test: Do not use instructions:u explicitly

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Message-ID: <a8a01dc8-a8ae-f102-5f08-42a646a837a1@intel.com>
Date:   Wed, 7 Sep 2022 10:56:21 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/6] perf test: Do not use instructions:u explicitly

On 7/09/22 09:46, Namhyung Kim wrote:
> I think it's to support non-root user tests.  But perf record can handle
> the case and fall back to a software event (cpu-clock).  Practically this
> would affect when it's run on a VM, but it seems no reason to prevent running
> the test in the guest.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/tests/shell/record.sh | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> index 00c7285ce1ac..40b087bfdb76 100755
> --- a/tools/perf/tests/shell/record.sh
> +++ b/tools/perf/tests/shell/record.sh
> @@ -21,18 +21,18 @@ trap trap_cleanup exit term int
>  
>  test_per_thread() {
>    echo "Basic --per-thread mode test"
> -  if ! perf record -e instructions:u -o ${perfdata} --quiet true 2> /dev/null
> +  if ! perf record -o /dev/null --quiet true 2> /dev/null
>    then
> -    echo "Per-thread record [Skipped instructions:u not supported]"
> +    echo "Per-thread record [Skipped event not supported]"
>      if [ $err -ne 1 ]
>      then
>        err=2
>      fi
>      return
>    fi
> -  if ! perf record -e instructions:u --per-thread -o ${perfdata} true 2> /dev/null
> +  if ! perf record --per-thread -o ${perfdata} true 2> /dev/null
>    then
> -    echo "Per-thread record of instructions:u [Failed]"
> +    echo "Per-thread record [Failed record]"
>      err=1
>      return
>    fi
> @@ -49,7 +49,7 @@ 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]"
> +    echo "Register capture test [Skipped missing event]"
>      if [ $err -ne 1 ]
>      then
>        err=2