[PATCH v2] perf test: Be more tolerant of metricgroup failures

[Ian Rogers <irogers@google.com>]

Previously "set -e" meant any non-zero exit code from perf stat would
cause a test failure. As a non-zero exit happens when there aren't
sufficient permissions, check for this case and make the exit code
2/skip for it.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
---
v2. Add skip if event mode isn't valid in per-thread mode. Suggested
    by Veronika Molnarova <vmolnaro@redhat.com>.
---
 .../perf/tests/shell/stat_all_metricgroups.sh | 36 +++++++++++++++----
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/tools/perf/tests/shell/stat_all_metricgroups.sh b/tools/perf/tests/shell/stat_all_metricgroups.sh
index 55ef9c9ded2d..c6d61a4ac3e7 100755
--- a/tools/perf/tests/shell/stat_all_metricgroups.sh
+++ b/tools/perf/tests/shell/stat_all_metricgroups.sh
@@ -1,9 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 # perf all metricgroups test
 # SPDX-License-Identifier: GPL-2.0
 
-set -e
-
 ParanoidAndNotRoot()
 {
   [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
@@ -14,11 +12,37 @@ if ParanoidAndNotRoot 0
 then
   system_wide_flag=""
 fi
-
+err=0
 for m in $(perf list --raw-dump metricgroups)
 do
   echo "Testing $m"
-  perf stat -M "$m" $system_wide_flag sleep 0.01
+  result=$(perf stat -M "$m" $system_wide_flag sleep 0.01 2>&1)
+  result_err=$?
+  if [[ $result_err -gt 0 ]]
+  then
+    if [[ "$result" =~ \
+          "Access to performance monitoring and observability operations is limited" ]]
+    then
+      echo "Permission failure"
+      echo $result
+      if [[ $err -eq 0 ]]
+      then
+        err=2 # Skip
+      fi
+    elif [[ "$result" =~ "in per-thread mode, enable system wide" ]]
+    then
+      echo "Permissions - need system wide mode"
+      echo $result
+      if [[ $err -eq 0 ]]
+      then
+        err=2 # Skip
+      fi
+    else
+      echo "Metric group $m failed"
+      echo $result
+      err=1 # Fail
+    fi
+  fi
 done
 
-exit 0
+exit $err
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog