#!/bin/sh# perf record offcpu profiling tests (exclusive)# SPDX-License-Identifier: GPL-2.0 set -e err=0perfdata=$(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_basicfi if [ $err = 0 ]; then  test_offcpu_childfi cleanupexit $err