perf test: Avoid uncore_imc/clockticks in uniquification test

The detection of uncore_imc may happen for free running PMUs and the
clockticks event may be present on uncore_clock. Rewrite the test to
detect duplicated/deduplicated events from perf list, not hardcoded to
uncore_imc.

If perf stat fails then assume it is permissions and skip the test.

Committer testing:

Before:

root@x1:~# perf test -vv uniquifyi
96: perf stat events uniquifying:
--- start ---
test child forked, pid 220851
stat event uniquifying test
grep: Unmatched [, [^, [:, [., or [=
Event is not uniquified [Failed]
perf stat -e clockticks -A -o /tmp/__perf_test.stat_output.X7ChD -- true
# started on Fri Sep 19 16:48:38 2025

Performance counter stats for 'system wide':

CPU0 2,310,956 uncore_clock/clockticks/

0.001746771 seconds time elapsed

---- end(-1) ----
96: perf stat events uniquifying : FAILED!
root@x1:~#

After:

root@x1:~# perf test -vv uniquifyi
96: perf stat events uniquifying:
--- start ---
test child forked, pid 222366
Uniquification of PMU sysfs events test
Testing event uncore_imc_free_running/data_read/ is uniquified to uncore_imc_free_running_0/data_read/
Testing event uncore_imc_free_running/data_total/ is uniquified to uncore_imc_free_running_0/data_total/
Testing event uncore_imc_free_running/data_write/ is uniquified to uncore_imc_free_running_0/data_write/
Testing event uncore_imc_free_running/data_read/ is uniquified to uncore_imc_free_running_1/data_read/
Testing event uncore_imc_free_running/data_total/ is uniquified to uncore_imc_free_running_1/data_total/
Testing event uncore_imc_free_running/data_write/ is uniquified to uncore_imc_free_running_1/data_write/
---- end(0) ----
96: perf stat events uniquifying : Ok
root@x1:~#

Fixes: 070b315333ee942f ("perf test: Restrict uniquifying test to machines with 'uncore_imc'")
Signed-off-by: Ian Rogers <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Athira Rajeev <[e-mail]>
Cc: Chun-Tse Shao <[e-mail]>
Cc: Howard Chu <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/stat+event_uniquifying.sh

···
 
 set -e
 
-stat_output=$(mktemp /tmp/__perf_test.stat_output.XXXXX)
-perf_tool=perf
 err=0
+stat_output=$(mktemp /tmp/__perf_test.stat_output.XXXXX)
+
+cleanup() {
+  rm -f "${stat_output}"
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
 
 test_event_uniquifying() {
-  # We use `clockticks` in `uncore_imc` to verify the uniquify behavior.
-  pmu="uncore_imc"
-  event="clockticks"
+  echo "Uniquification of PMU sysfs events test"
 
-  # If the `-A` option is added, the event should be uniquified.
-  #
-  # $perf list -v clockticks
-  #
-  # List of pre-defined events (to be used in -e or -M):
-  #
-  #   uncore_imc_0/clockticks/                           [Kernel PMU event]
-  #   uncore_imc_1/clockticks/                           [Kernel PMU event]
-  #   uncore_imc_2/clockticks/                           [Kernel PMU event]
-  #   uncore_imc_3/clockticks/                           [Kernel PMU event]
-  #   uncore_imc_4/clockticks/                           [Kernel PMU event]
-  #   uncore_imc_5/clockticks/                           [Kernel PMU event]
-  #
-  #   ...
-  #
-  # $perf stat -e clockticks -A -- true
-  #
-  #  Performance counter stats for 'system wide':
-  #
-  # CPU0            3,773,018      uncore_imc_0/clockticks/
-  # CPU0            3,609,025      uncore_imc_1/clockticks/
-  # CPU0                    0      uncore_imc_2/clockticks/
-  # CPU0            3,230,009      uncore_imc_3/clockticks/
-  # CPU0            3,049,897      uncore_imc_4/clockticks/
-  # CPU0                    0      uncore_imc_5/clockticks/
-  #
-  #        0.002029828 seconds time elapsed
-
-  echo "stat event uniquifying test"
-  uniquified_event_array=()
-
-  # Skip if the machine does not have `uncore_imc` device.
-  if ! ${perf_tool} list pmu | grep -q ${pmu}; then
-    echo "Target does not support PMU ${pmu} [Skipped]"
-    err=2
-    return
-  fi
-
-  # Check how many uniquified events.
-  while IFS= read -r line; do
-    uniquified_event=$(echo "$line" | awk '{print $1}')
-    uniquified_event_array+=("${uniquified_event}")
-  done < <(${perf_tool} list -v ${event} | grep ${pmu})
-
-  perf_command="${perf_tool} stat -e $event -A -o ${stat_output} -- true"
-  $perf_command
-
-  # Check the output contains all uniquified events.
-  for uniquified_event in "${uniquified_event_array[@]}"; do
-    if ! cat "${stat_output}" | grep -q "${uniquified_event}"; then
-      echo "Event is not uniquified [Failed]"
-      echo "${perf_command}"
-      cat "${stat_output}"
-      err=1
-      break
-    fi
+  # Read events from perf list with and without -v. With -v the duplicate PMUs
+  # aren't deduplicated. Note, json events are listed by perf list without a
+  # PMU.
+  read -ra pmu_events <<< "$(perf list --raw pmu)"
+  read -ra pmu_v_events <<< "$(perf list -v --raw pmu)"
+  # For all non-deduplicated events.
+  for pmu_v_event in "${pmu_v_events[@]}"; do
+    # If the event matches an event in the deduplicated events then it musn't
+    # be an event with duplicate PMUs, continue the outer loop.
+    for pmu_event in "${pmu_events[@]}"; do
+      if [[ "$pmu_v_event" == "$pmu_event" ]]; then
+        continue 2
+      fi
+    done
+    # Strip the suffix from the non-deduplicated event's PMU.
+    event=$(echo "$pmu_v_event" | sed -E 's/_[0-9]+//')
+    for pmu_event in "${pmu_events[@]}"; do
+      if [[ "$event" == "$pmu_event" ]]; then
+        echo "Testing event ${event} is uniquified to ${pmu_v_event}"
+        if ! perf stat -e "$event" -A -o ${stat_output} -- true; then
+          echo "Error running perf stat for event '$event'  [Skip]"
+          if [ $err = 0 ]; then
+            err=2
+          fi
+          continue
+        fi
+        # Ensure the non-deduplicated event appears in the output.
+        if ! grep -q "${pmu_v_event}" "${stat_output}"; then
+          echo "Uniquification of PMU sysfs events test [Failed]"
+          cat "${stat_output}"
+          err=1
+        fi
+        break
+      fi
+    done
   done
 }
 
 test_event_uniquifying
-rm -f "${stat_output}"
+cleanup
 exit $err