perf test: Add a new test for perf stat cgroup BPF counter

  $ sudo ./perf test -v each-cgroup
   96: perf stat --bpf-counters --for-each-cgroup test                 :
  --- start ---
  test child forked, pid 79600
  test child finished with 0
  ---- end ----
  perf stat --bpf-counters --for-each-cgroup test: Ok

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20220916184132.1161506-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/shell/stat_bpf_counters_cgrp.sh b/tools/perf/tests/shell/stat_bpf_counters_cgrp.sh
new file mode 100755 (executable)
index 0000000..d724855
--- /dev/null
+++ b/tools/perf/tests/shell/stat_bpf_counters_cgrp.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+# perf stat --bpf-counters --for-each-cgroup test
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+test_cgroups=
+if [ "$1" = "-v" ]; then
+       verbose="1"
+fi
+
+# skip if --bpf-counters --for-each-cgroup is not supported
+check_bpf_counter()
+{
+       if ! perf stat -a --bpf-counters --for-each-cgroup / true > /dev/null 2>&1; then
+               if [ "${verbose}" = "1" ]; then
+                       echo "Skipping: --bpf-counters --for-each-cgroup not supported"
+                       perf --no-pager stat -a --bpf-counters --for-each-cgroup / true || true
+               fi
+               exit 2
+       fi
+}
+
+# find two cgroups to measure
+find_cgroups()
+{
+       # try usual systemd slices first
+       if [ -d /sys/fs/cgroup/system.slice -a -d /sys/fs/cgroup/user.slice ]; then
+               test_cgroups="system.slice,user.slice"
+               return
+       fi
+
+       # try root and self cgroups
+       local self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
+       if [ -z ${self_cgrp} ]; then
+               # cgroup v2 doesn't specify perf_event
+               self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
+       fi
+
+       if [ -z ${self_cgrp} ]; then
+               test_cgroups="/"
+       else
+               test_cgroups="/,${self_cgrp}"
+       fi
+}
+
+# As cgroup events are cpu-wide, we cannot simply compare the result.
+# Just check if it runs without failure and has non-zero results.
+check_system_wide_counted()
+{
+       local output
+
+       output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)
+       if echo ${output} | grep -q -F "<not "; then
+               echo "Some system-wide events are not counted"
+               if [ "${verbose}" = "1" ]; then
+                       echo ${output}
+               fi
+               exit 1
+       fi
+}
+
+check_cpu_list_counted()
+{
+       local output
+
+       output=$(perf stat -C 1 --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, taskset -c 1 sleep 1  2>&1)
+       if echo ${output} | grep -q -F "<not "; then
+               echo "Some CPU events are not counted"
+               if [ "${verbose}" = "1" ]; then
+                       echo ${output}
+               fi
+               exit 1
+       fi
+}
+
+check_bpf_counter
+find_cgroups
+
+check_system_wide_counted
+check_cpu_list_counted
+
+exit 0