name : record_offcpu.sh #!/bin/sh # perf record offcpu profiling tests # SPDX-License-Identifier: GPL-2.0 set -e err=0 perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) cleanup() { rm -f ${perfdata} rm -f ${perfdata}.old trap - EXIT TERM INT } trap_cleanup() { cleanup exit 1 } trap trap_cleanup EXIT TERM INT test_offcpu_priv() { echo "Checking off-cpu privilege" if [ "$(id -u)" != 0 ] then echo "off-cpu test [Skipped permission]" err=2 return fi if perf version --build-options 2>&1 | grep HAVE_BPF_SKEL | grep -q OFF then echo "off-cpu test [Skipped missing BPF support]" err=2 return fi } test_offcpu_basic() { echo "Basic off-cpu test" if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null then echo "Basic off-cpu test [Failed record]" err=1 return fi if ! perf evlist -i ${perfdata} | grep -q "offcpu-time" then echo "Basic off-cpu test [Failed no event]" err=1 return fi if ! perf report -i ${perfdata} -q --percent-limit=90 | grep -E -q sleep then echo "Basic off-cpu test [Failed missing output]" err=1 return fi echo "Basic off-cpu test [Success]" } test_offcpu_child() { echo "Child task off-cpu test" # perf bench sched messaging creates 400 processes if ! perf record --off-cpu -e dummy -o ${perfdata} -- \ perf bench sched messaging -g 10 > /dev/null 2>&1 then echo "Child task off-cpu test [Failed record]" err=1 return fi if ! perf evlist -i ${perfdata} | grep -q "offcpu-time" then echo "Child task off-cpu test [Failed no event]" err=1 return fi # each process waits at least for poll, so it should be more than 400 events if ! perf report -i ${perfdata} -s comm -q -n -t ';' --percent-limit=90 | \ awk -F ";" '{ if (NF > 3 && int($3) < 400) exit 1; }' then echo "Child task off-cpu test [Failed invalid output]" err=1 return fi echo "Child task off-cpu test [Success]" } test_offcpu_priv if [ $err = 0 ]; then test_offcpu_basic fi if [ $err = 0 ]; then test_offcpu_child fi cleanup exit $err