Merge: perf test: Fix the TPEBS test and skip on KVM

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/889

JIRA: https://issues.redhat.com/browse/RHEL-82381

This test fails on KVM, it should not be run there.

Signed-off-by: Michael Petlan <mpetlan@redhat.com>

Approved-by: Čestmír Kalina <ckalina@redhat.com>
Approved-by: ashelat <ashelat@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Julio Faracco <jfaracco@redhat.com>

Author: jcfaracco

tools/perf/tests/shell/test_stat_intel_tpebs.sh

@@ -3,20 +3,83 @@
 # SPDX-License-Identifier: GPL-2.0
 
 set -e
-grep -q GenuineIntel /proc/cpuinfo || { echo Skipping non-Intel; exit 2; }
 
-# Use this event for testing because it should exist in all platforms
-event=cache-misses:R
+ParanoidAndNotRoot() {
+  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
+}
 
-# Hybrid platforms output like "cpu_atom/cache-misses/R", rather than as above
-alt_name=/cache-misses/R
+if ! grep -q GenuineIntel /proc/cpuinfo
+then
+  echo "Skipping non-Intel"
+  exit 2
+fi
 
-# Without this cmd option, default value or zero is returned
-#echo "Testing without --record-tpebs"
-#result=$(perf stat -e "$event" true 2>&1)
-#[[ "$result" =~ $event || "$result" =~ $alt_name ]] || exit 1
+if ParanoidAndNotRoot 0
+then
+  echo "Skipping paranoid >0 and not root"
+  exit 2
+fi
 
-# 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" =~ $alt_name ]] || exit 1
+stat_output=$(mktemp /tmp/__perf_stat_tpebs_output.XXXXX)
+
+cleanup() {
+  rm -rf "${stat_output}"
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cat "${stat_output}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+# Event to be used in tests
+event=cache-misses
+
+if ! perf record -e "${event}:p" -a -o /dev/null sleep 0.01 > "${stat_output}" 2>&1
+then
+  echo "Missing ${event} support"
+  cleanup
+  exit 2
+fi
+
+test_with_record_tpebs() {
+  echo "Testing with --record-tpebs"
+  if ! perf stat -e "${event}:R" --record-tpebs -a sleep 0.01 > "${stat_output}" 2>&1
+  then
+    echo "Testing with --record-tpebs [Failed perf stat]"
+    cat "${stat_output}"
+    exit 1
+  fi
+
+  # 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 ! grep "perf record" "${stat_output}"
+  then
+    echo "Testing with --record-tpebs [Failed missing perf record]"
+    cat "${stat_output}"
+    exit 1
+  fi
+  if ! grep "${event}:R" "${stat_output}" && ! grep "/${event}/R" "${stat_output}"
+  then
+    echo "Testing with --record-tpebs [Failed missing event name]"
+    cat "${stat_output}"
+    exit 1
+  fi
+  echo "Testing with --record-tpebs [Success]"
+}
+
+test_with_record_tpebs
+cleanup
+exit 0