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#!/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 ] && [ -d /sys/fs/cgroup/user.slice ]; then
test_cgroups="system.slice,user.slice"
return
fi
# try root and self cgroups
find_cgroups_self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
if [ -z ${find_cgroups_self_cgrp} ]; then
# cgroup v2 doesn't specify perf_event
find_cgroups_self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
fi
if [ -z ${find_cgroups_self_cgrp} ]; then
test_cgroups="/"
else
test_cgroups="/,${find_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()
{
check_system_wide_counted_output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1 2>&1)
if echo ${check_system_wide_counted_output} | grep -q -F "<not "; then
echo "Some system-wide events are not counted"
if [ "${verbose}" = "1" ]; then
echo ${check_system_wide_counted_output}
fi
exit 1
fi
}
check_bpf_counter
find_cgroups
check_system_wide_counted
exit 0
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