tools/perf/tests/shell/stat_bpf_counters_cgrp.sh

   1 #!/bin/sh
   2 # perf stat --bpf-counters --for-each-cgroup test
   3 # SPDX-License-Identifier: GPL-2.0
   4
   5 set -e
   6
   7 test_cgroups=
   8 if [ "$1" = "-v" ]; then
   9         verbose="1"
  10 fi
  11
  12 # skip if --bpf-counters --for-each-cgroup is not supported
  13 check_bpf_counter()
  14 {
  15         if ! perf stat -a --bpf-counters --for-each-cgroup / true > /dev/null 2>&1; then
  16                 if [ "${verbose}" = "1" ]; then
  17                         echo "Skipping: --bpf-counters --for-each-cgroup not supported"
  18                         perf --no-pager stat -a --bpf-counters --for-each-cgroup / true || true
  19                 fi
  20                 exit 2
  21         fi
  22 }
  23
  24 # find two cgroups to measure
  25 find_cgroups()
  26 {
  27         # try usual systemd slices first
  28         if [ -d /sys/fs/cgroup/system.slice ] && [ -d /sys/fs/cgroup/user.slice ]; then
  29                 test_cgroups="system.slice,user.slice"
  30                 return
  31         fi
  32
  33         # try root and self cgroups
  34         find_cgroups_self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
  35         if [ -z ${find_cgroups_self_cgrp} ]; then
  36                 # cgroup v2 doesn't specify perf_event
  37                 find_cgroups_self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
  38         fi
  39
  40         if [ -z ${find_cgroups_self_cgrp} ]; then
  41                 test_cgroups="/"
  42         else
  43                 test_cgroups="/,${find_cgroups_self_cgrp}"
  44         fi
  45 }
  46
  47 # As cgroup events are cpu-wide, we cannot simply compare the result.
  48 # Just check if it runs without failure and has non-zero results.
  49 check_system_wide_counted()
  50 {
  51         check_system_wide_counted_output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)
  52         if echo ${check_system_wide_counted_output} | grep -q -F "<not "; then
  53                 echo "Some system-wide events are not counted"
  54                 if [ "${verbose}" = "1" ]; then
  55                         echo ${check_system_wide_counted_output}
  56                 fi
  57                 exit 1
  58         fi
  59 }
  60
  61 check_bpf_counter
  62 find_cgroups
  63
  64 check_system_wide_counted
  65
  66 exit 0