test_arm_spe_fork.sh (1876B)
1#!/bin/sh 2# Check Arm SPE doesn't hang when there are forks 3 4# SPDX-License-Identifier: GPL-2.0 5# German Gomez <german.gomez@arm.com>, 2022 6 7skip_if_no_arm_spe_event() { 8 perf list | egrep -q 'arm_spe_[0-9]+//' && return 0 9 return 2 10} 11 12skip_if_no_arm_spe_event || exit 2 13 14# skip if there's no compiler 15if ! [ -x "$(command -v cc)" ]; then 16 echo "failed: no compiler, install gcc" 17 exit 2 18fi 19 20TEST_PROGRAM_SOURCE=$(mktemp /tmp/__perf_test.program.XXXXX.c) 21TEST_PROGRAM=$(mktemp /tmp/__perf_test.program.XXXXX) 22PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX) 23PERF_RECORD_LOG=$(mktemp /tmp/__perf_test.log.XXXXX) 24 25cleanup_files() 26{ 27 echo "Cleaning up files..." 28 rm -f ${PERF_RECORD_LOG} 29 rm -f ${PERF_DATA} 30 rm -f ${TEST_PROGRAM_SOURCE} 31 rm -f ${TEST_PROGRAM} 32} 33 34trap cleanup_files exit term int 35 36# compile test program 37cat << EOF > $TEST_PROGRAM_SOURCE 38#include <math.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <unistd.h> 42#include <sys/wait.h> 43 44int workload() { 45 while (1) 46 sqrt(rand()); 47 return 0; 48} 49 50int main() { 51 switch (fork()) { 52 case 0: 53 return workload(); 54 case -1: 55 return 1; 56 default: 57 wait(NULL); 58 } 59 return 0; 60} 61EOF 62 63echo "Compiling test program..." 64CFLAGS="-lm" 65cc $TEST_PROGRAM_SOURCE $CFLAGS -o $TEST_PROGRAM || exit 1 66 67echo "Recording workload..." 68perf record -o ${PERF_DATA} -e arm_spe/period=65536/ -vvv -- $TEST_PROGRAM > ${PERF_RECORD_LOG} 2>&1 & 69PERFPID=$! 70 71# Check if perf hangs by checking the perf-record logs. 72sleep 1 73log0=$(wc -l $PERF_RECORD_LOG) 74echo Log lines = $log0 75sleep 1 76log1=$(wc -l $PERF_RECORD_LOG) 77echo Log lines after 1 second = $log1 78 79kill $PERFPID 80wait $PERFPID 81# test program may leave an orphan process running the workload 82killall $(basename $TEST_PROGRAM) 83 84if [ "$log0" = "$log1" ]; 85then 86 echo "SPE hang test: FAIL" 87 exit 1 88else 89 echo "SPE hang test: PASS" 90fi 91 92exit 0