1#!/bin/sh 2# perf record offcpu profiling tests 3# SPDX-License-Identifier: GPL-2.0 4 5set -e 6 7err=0 8perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) 9 10cleanup() { 11 rm -f ${perfdata} 12 rm -f ${perfdata}.old 13 trap - exit term int 14} 15 16trap_cleanup() { 17 cleanup 18 exit 1 19} 20trap trap_cleanup exit term int 21 22test_offcpu_priv() { 23 echo "Checking off-cpu privilege" 24 25 if [ `id -u` != 0 ] 26 then 27 echo "off-cpu test [Skipped permission]" 28 err=2 29 return 30 fi 31 if perf record --off-cpu -o /dev/null --quiet true 2>&1 | grep BUILD_BPF_SKEL 32 then 33 echo "off-cpu test [Skipped missing BPF support]" 34 err=2 35 return 36 fi 37} 38 39test_offcpu_basic() { 40 echo "Basic off-cpu test" 41 42 if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null 43 then 44 echo "Basic off-cpu test [Failed record]" 45 err=1 46 return 47 fi 48 if ! perf evlist -i ${perfdata} | grep -q "offcpu-time" 49 then 50 echo "Basic off-cpu test [Failed no event]" 51 err=1 52 return 53 fi 54 if ! perf report -i ${perfdata} -q --percent-limit=90 | egrep -q sleep 55 then 56 echo "Basic off-cpu test [Failed missing output]" 57 err=1 58 return 59 fi 60 echo "Basic off-cpu test [Success]" 61} 62 63test_offcpu_child() { 64 echo "Child task off-cpu test" 65 66 # perf bench sched messaging creates 400 processes 67 if ! perf record --off-cpu -e dummy -o ${perfdata} -- \ 68 perf bench sched messaging -g 10 > /dev/null 2&>1 69 then 70 echo "Child task off-cpu test [Failed record]" 71 err=1 72 return 73 fi 74 if ! perf evlist -i ${perfdata} | grep -q "offcpu-time" 75 then 76 echo "Child task off-cpu test [Failed no event]" 77 err=1 78 return 79 fi 80 # each process waits for read and write, so it should be more than 800 events 81 if ! perf report -i ${perfdata} -s comm -q -n -t ';' --percent-limit=90 | \ 82 awk -F ";" '{ if (NF > 3 && int($3) < 800) exit 1; }' 83 then 84 echo "Child task off-cpu test [Failed invalid output]" 85 err=1 86 return 87 fi 88 echo "Child task off-cpu test [Success]" 89} 90 91 92test_offcpu_priv 93 94if [ $err = 0 ]; then 95 test_offcpu_basic 96fi 97 98if [ $err = 0 ]; then 99 test_offcpu_child 100fi 101 102cleanup 103exit $err 104