#!/bin/bash# perf record tests (exclusive)# SPDX-License-Identifier: GPL-2.0 set -e shelldir=$(dirname "$0")# shellcheck source=lib/waiting.sh. "${shelldir}"/lib/waiting.sh # shellcheck source=lib/perf_has_symbol.sh. "${shelldir}"/lib/perf_has_symbol.sh testsym="test_loop" skip_test_missing_symbol ${testsym} err=0perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)script_output=$(mktemp /tmp/__perf_test.perf.data.XXXXX.script)testprog="perf test -w thloop"cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"br_cntr_file="/caps/branch_counter_nr"br_cntr_output="branch stack counters"br_cntr_script_output="br_cntr: A" default_fd_limit=$(ulimit -Sn)# With option --threads=cpu the number of open file descriptors should be# equal to sum of:    nmb_cpus * nmb_events (2+dummy),#                     nmb_threads for perf.data.n (equal to nmb_cpus) and#                     2*nmb_cpus of pipes = 4*nmb_cpus (each pipe has 2 ends)# All together it needs 8*nmb_cpus file descriptors plus some are also used# outside of testing, thus raising the limit to 16*nmb_cpusmin_fd_limit=$(($(getconf _NPROCESSORS_ONLN) * 16)) cleanup() {  rm -rf "${perfdata}"  rm -rf "${perfdata}".old   trap - EXIT TERM INT} trap_cleanup() {  cleanup  exit 1}trap trap_cleanup EXIT TERM INT test_per_thread() {  echo "Basic --per-thread mode test"  if ! perf record -o /dev/null --quiet ${testprog} 2> /dev/null  then    echo "Per-thread record [Skipped event not supported]"    return  fi  if ! perf record --per-thread -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "Per-thread record [Failed record]"    err=1    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "Per-thread record [Failed missing output]"    err=1    return  fi   # run the test program in background (for 30 seconds)  ${testprog} 30 &  TESTPID=$!   rm -f "${perfdata}"   wait_for_threads ${TESTPID} 2  perf record -p "${TESTPID}" --per-thread -o "${perfdata}" sleep 1 2> /dev/null  kill ${TESTPID}   if [ ! -e "${perfdata}" ]  then    echo "Per-thread record [Failed record -p]"    err=1    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "Per-thread record [Failed -p missing output]"    err=1    return  fi   echo "Basic --per-thread mode test [Success]"} test_register_capture() {  echo "Register capture test"  if ! perf list pmu | grep -q 'br_inst_retired.near_call'  then    echo "Register capture test [Skipped missing event]"    return  fi  if ! perf record --intr-regs=\? 2>&1 | grep -q 'available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15'  then    echo "Register capture test [Skipped missing registers]"    return  fi  if ! perf record -o - --intr-regs=di,r8,dx,cx -e br_inst_retired.near_call \    -c 1000 --per-thread ${testprog} 2> /dev/null \    | perf script -F ip,sym,iregs -i - 2> /dev/null \    | grep -q "DI:"  then    echo "Register capture test [Failed missing output]"    err=1    return  fi  echo "Register capture test [Success]"} test_system_wide() {  echo "Basic --system-wide mode test"  if ! perf record -aB --synth=no -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "System-wide record [Skipped not supported]"    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "System-wide record [Failed missing output]"    err=1    return  fi  if ! perf record -aB --synth=no -e cpu-clock,cs --threads=cpu \    -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "System-wide record [Failed record --threads option]"    err=1    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "System-wide record [Failed --threads missing output]"    err=1    return  fi  echo "Basic --system-wide mode test [Success]"} test_workload() {  echo "Basic target workload test"  if ! perf record -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "Workload record [Failed record]"    err=1    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "Workload record [Failed missing output]"    err=1    return  fi  if ! perf record -e cpu-clock,cs --threads=package \    -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "Workload record [Failed record --threads option]"    err=1    return  fi  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"  then    echo "Workload record [Failed --threads missing output]"    err=1    return  fi  echo "Basic target workload test [Success]"} test_branch_counter() {  echo "Branch counter test"  # Check if the branch counter feature is supported  for dir in $cpu_pmu_dir  do    if [ ! -e "$dir$br_cntr_file" ]    then      echo "branch counter feature not supported on all core PMUs ($dir) [Skipped]"      return    fi  done  if ! perf record -o "${perfdata}" -e "{branches:p,instructions}" -j any,counter ${testprog} 2> /dev/null  then    echo "Branch counter record test [Failed record]"    err=1    return  fi  if ! perf report -i "${perfdata}" -D -q | grep -q "$br_cntr_output"  then    echo "Branch counter report test [Failed missing output]"    err=1    return  fi  if ! perf script -i "${perfdata}" -F +brstackinsn,+brcntr | grep -q "$br_cntr_script_output"  then    echo " Branch counter script test [Failed missing output]"    err=1    return  fi  echo "Branch counter test [Success]"} test_cgroup() {  echo "Cgroup sampling test"  if ! perf record -aB --synth=cgroup --all-cgroups -o "${perfdata}" ${testprog} 2> /dev/null  then    echo "Cgroup sampling [Skipped not supported]"    return  fi  if ! perf report -i "${perfdata}" -D | grep -q "CGROUP"  then    echo "Cgroup sampling [Failed missing output]"    err=1    return  fi  if ! perf script -i "${perfdata}" -F cgroup | grep -q -v "unknown"  then    echo "Cgroup sampling [Failed cannot resolve cgroup names]"    err=1    return  fi  echo "Cgroup sampling test [Success]"} test_leader_sampling() {  echo "Basic leader sampling test"  if ! perf record -o "${perfdata}" -e "{instructions,instructions}:Su" -- \    perf test -w brstack 2> /dev/null  then    echo "Leader sampling [Failed record]"    err=1    return  fi  index=0  perf script -i "${perfdata}" > $script_output  while IFS= read -r line  do    # Check if the two instruction counts are equal in each record    instructions=$(echo $line | awk '{for(i=1;i<=NF;i++) if($i=="instructions:") print $(i-1)}')    if [ $(($index%2)) -ne 0 ] && [ ${instructions}x != ${prev_instructions}x ]    then      echo "Leader sampling [Failed inconsistent instructions count]"      err=1      return    fi    index=$(($index+1))    prev_instructions=$instructions  done < $script_output  echo "Basic leader sampling test [Success]"} test_topdown_leader_sampling() {  echo "Topdown leader sampling test"  if ! perf stat -e "{slots,topdown-retiring}" true 2> /dev/null  then    echo "Topdown leader sampling [Skipped event parsing failed]"    return  fi  if ! perf record -o "${perfdata}" -e "{instructions,slots,topdown-retiring}:S" true 2> /dev/null  then    echo "Topdown leader sampling [Failed topdown events not reordered correctly]"    err=1    return  fi  echo "Topdown leader sampling test [Success]"} test_precise_max() {  echo "precise_max attribute test"  if ! perf stat -e "cycles,instructions" true 2> /dev/null  then    echo "precise_max attribute [Skipped no hardware events]"    return  fi  # Just to make sure it doesn't fail  if ! perf record -o "${perfdata}" -e "cycles:P" true 2> /dev/null  then    echo "precise_max attribute [Failed cycles:P event]"    err=1    return  fi  # On AMD, cycles and instructions events are treated differently  if ! perf record -o "${perfdata}" -e "instructions:P" true 2> /dev/null  then    echo "precise_max attribute [Failed instructions:P event]"    err=1    return  fi  echo "precise_max attribute test [Success]"} # raise the limit of file descriptors to minimumif [[ $default_fd_limit -lt $min_fd_limit ]]; then       ulimit -Sn $min_fd_limitfi test_per_threadtest_register_capturetest_system_widetest_workloadtest_branch_countertest_cgrouptest_leader_samplingtest_topdown_leader_samplingtest_precise_max # restore the default valueulimit -Sn $default_fd_limit cleanupexit $err