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

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Date:   Fri, 29 Sep 2023 23:02:06 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf test: Avoid system wide when not privileged

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>
---
 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