perf test shell tpebs: Extra verbosity on failure

I've encountered occasional test failures with this test. Add verbose
output on failure to help diagnose the issue.

Signed-off-by: Ian Rogers <[email protected]>

tools/perf/tests/shell/test_stat_intel_tpebs.sh

@@ -20,6 +20,17 @@ then
   exit 2
 fi
 
+cleanup() {
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
 # Use this event for testing because it should exist in all platforms
 event=cache-misses:R
 
@@ -31,8 +42,36 @@ alt_name=/cache-misses/R
 #result=$(perf stat -e "$event" true 2>&1)
 #[[ "$result" =~ $event || "$result" =~ $alt_name ]] || exit 1
 
-# In platforms that do not support TPEBS, it should execute without error.
-echo "Testing with --record-tpebs"
-result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
-[[ "$result" =~ "perf record" && "$result" =~ $event || "$result" =~ $alt_name ]] || exit 1
-echo "Success!"
+test_with_record_tpebs() {
+  echo "Testing with --record-tpebs"
+  result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
+
+  # Expected output:
+  # $ perf stat --record-tpebs -e cache-misses:R -a sleep 0.01
+  # Events enabled
+  # [ perf record: Woken up 2 times to write data ]
+  # [ perf record: Captured and wrote 0.056 MB - ]
+  #
+  #  Performance counter stats for 'system wide':
+  #
+  #                  0      cache-misses:R
+  #
+  #        0.013963299 seconds time elapsed
+  if [[ ! "$result" =~ "perf record" ]]
+  then
+    echo "Testing with --record-tpebs [Failed missing perf record]"
+    echo "$result"
+    exit 1
+  fi
+  if [[ ! "$result" =~ $event && ! "$result" =~ $alt_name ]]
+  then
+    echo "Testing with --record-tpebs [Failed missing event name]"
+    echo "$result"
+    exit 1
+  fi
+  echo "Testing with --record-tpebs [Success]"
+}
+
+test_with_record_tpebs
+cleanup
+exit 0