linux-kernel - Re: [PATCH v1] perf test: Avoid system wide when not privileged

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Date:   Mon, 2 Oct 2023 21:46:52 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf test: Avoid system wide when not privileged

Hi Ian,

On Fri, Sep 29, 2023 at 11:02 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Switch the test program to sleep that makes more sense for system wide
> events. Only enable system wide when root or not paranoid. This avoids
> failures under some testing conditions like ARM cloud.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

While I'm ok with the change, I wonder why it doesn't have the same
code structure as in the stat_all_metrics.sh which checks the actual result.

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

> ---
>  tools/perf/tests/shell/stat_all_metricgroups.sh | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/tests/shell/stat_all_metricgroups.sh b/tools/perf/tests/shell/stat_all_metricgroups.sh
> index cb35e488809a..f3e305649e2c 100755
> --- a/tools/perf/tests/shell/stat_all_metricgroups.sh
> +++ b/tools/perf/tests/shell/stat_all_metricgroups.sh
> @@ -4,9 +4,21 @@
>
>  set -e
>
> -for m in $(perf list --raw-dump metricgroups); do
> +function ParanoidAndNotRoot()
> +{
> +  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
> +}
> +
> +system_wide_flag="-a"
> +if ParanoidAndNotRoot 0
> +then
> +  system_wide_flag=""
> +fi
> +
> +for m in $(perf list --raw-dump metricgroups)
> +do
>    echo "Testing $m"
> -  perf stat -M "$m" -a true
> +  perf stat -M "$m" $system_wide_flag sleep 0.01
>  done
>
>  exit 0
> --
> 2.42.0.582.g8ccd20d70d-goog
>