| 1 | |
| 2 | |
| 3 | |
| 4 |
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| 5 | set -e
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| 6 |
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| 7 | shelldir=$(dirname "$0")
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| 8 | . "${shelldir}"/lib/perf_record.sh
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| 9 |
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| 10 | ParanoidAndNotRoot() {
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| 11 | [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
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| 12 | }
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| 13 |
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| 14 | if [ ! -f /sys/bus/event_source/devices/cpu/caps/branches ] &&
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| 15 | [ ! -f /sys/bus/event_source/devices/cpu_core/caps/branches ]
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| 16 | then
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| 17 | echo "Skip: only x86 CPUs support LBR"
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| 18 | exit 2
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| 19 | fi
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| 20 |
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| 21 | err=0
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| 22 | perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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| 23 |
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| 24 | cleanup() {
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| 25 | rm -rf "${perfdata}"
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| 26 | rm -rf "${perfdata}".old
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| 27 | rm -rf "${perfdata}".txt
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| 28 | perf_record_cleanup
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| 29 |
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| 30 | trap - EXIT TERM INT
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| 31 | }
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| 32 |
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| 33 | trap_cleanup() {
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| 34 | echo "Unexpected signal in ${FUNCNAME[1]}"
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| 35 | cleanup
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| 36 | exit 1
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| 37 | }
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| 38 | trap trap_cleanup EXIT TERM INT
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| 39 |
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| 40 |
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| 41 | check_lbr_callgraph() {
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| 42 | perf report --stitch-lbr -i "${perfdata}" > "${perfdata}".txt 2>&1
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| 43 | }
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| 44 |
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| 45 | lbr_callgraph_test() {
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| 46 | test="LBR callgraph"
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| 47 |
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| 48 | echo "$test"
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| 49 | set +e
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| 50 | perf_record_with_retry "${perfdata}" "check_lbr_callgraph" "perf test -w thloop" \
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| 51 | -e cycles --call-graph lbr
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| 52 | local ret=$?
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| 53 | set -e
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| 54 |
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| 55 | if [ $ret -eq 2 ]; then
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| 56 | echo "$test [Failed support missing]"
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| 57 | if [ $err -eq 0 ]
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| 58 | then
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| 59 | err=2
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| 60 | fi
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| 61 | return
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| 62 | elif [ $ret -eq 1 ]; then
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| 63 | cat "${perfdata}".txt
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| 64 | echo "$test [Failed in perf report]"
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| 65 | err=1
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| 66 | return
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| 67 | fi
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| 68 |
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| 69 | echo "$test [Success]"
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| 70 | }
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| 71 |
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| 72 | check_lbr_samples() {
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| 73 | local out
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| 74 | out=$(perf report -D -i "${perfdata}" 2> /dev/null | grep -A1 'PERF_RECORD_SAMPLE')
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| 75 | [ "$(echo "$out" | grep -c 'PERF_RECORD_SAMPLE' || true)" -gt 0 ]
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| 76 | }
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| 77 |
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| 78 | lbr_test() {
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| 79 | local branch_flags=$1
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| 80 | local test="LBR $2 test"
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| 81 | local threshold=$3
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| 82 | local out
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| 83 | local sam_nr
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| 84 | local bs_nr
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| 85 | local zero_nr
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| 86 | local r
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| 87 |
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| 88 | echo "$test"
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| 89 | set +e
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| 90 | perf_record_with_retry "${perfdata}" "check_lbr_samples" "perf test -w thloop" \
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| 91 | -e cycles $branch_flags
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| 92 | local ret=$?
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| 93 | set -e
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| 94 |
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| 95 | if [ $ret -eq 2 ]; then
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| 96 | echo "$test [Failed support missing]"
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| 97 | if [ $err -eq 0 ]
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| 98 | then
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| 99 | err=2
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| 100 | fi
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| 101 | return
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| 102 | elif [ $ret -eq 1 ]; then
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| 103 | echo "$test [Failed no samples captured]"
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| 104 | err=1
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| 105 | return
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| 106 | fi
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| 107 |
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| 108 | out=$(perf report -D -i "${perfdata}" 2> /dev/null | grep -A1 'PERF_RECORD_SAMPLE')
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| 109 | sam_nr=$(echo "$out" | grep -c 'PERF_RECORD_SAMPLE' || true)
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| 110 | echo "$test: $sam_nr samples"
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| 111 |
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| 112 | bs_nr=$(echo "$out" | grep -c 'branch stack: nr:' || true)
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| 113 | if [ $sam_nr -ne $bs_nr ]
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| 114 | then
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| 115 | echo "$test [Failed samples missing branch stacks]"
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| 116 | err=1
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| 117 | return
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| 118 | fi
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| 119 |
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| 120 | zero_nr=$(echo "$out" | grep -A3 'branch stack: nr:0' | grep thread | grep -cv swapper || true)
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| 121 | r=$(($zero_nr * 100 / $bs_nr))
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| 122 | if [ $r -gt $threshold ]; then
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| 123 | echo "$test [Failed empty br stack ratio exceed $threshold%: $r%]"
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| 124 | err=1
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| 125 | return
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| 126 | fi
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| 127 |
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| 128 | echo "$test [Success]"
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| 129 | }
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| 130 |
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| 131 | parallel_lbr_test() {
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| 132 | err=0
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| 133 | perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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| 134 | lbr_test "$1" "$2" "$3"
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| 135 | cleanup
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| 136 | exit $err
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| 137 | }
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| 138 |
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| 139 | lbr_callgraph_test
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| 140 |
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| 141 | |
| 142 | lbr_test "-b" "any branch" 2
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| 143 | lbr_test "-j any_call" "any call" 2
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| 144 | lbr_test "-j any_ret" "any ret" 2
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| 145 | lbr_test "-j ind_call" "any indirect call" 2
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| 146 | lbr_test "-j ind_jmp" "any indirect jump" 100
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| 147 | lbr_test "-j call" "direct calls" 2
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| 148 | lbr_test "-j ind_call,u" "any indirect user call" 100
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| 149 | if ! ParanoidAndNotRoot 1
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| 150 | then
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| 151 | lbr_test "-a -b" "system wide any branch" 2
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| 152 | lbr_test "-a -j any_call" "system wide any call" 2
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| 153 | fi
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| 154 |
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| 155 | |
| 156 | parallel_lbr_test "-b" "parallel any branch" 100 &
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| 157 | pid1=$!
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| 158 | parallel_lbr_test "-j any_call" "parallel any call" 100 &
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| 159 | pid2=$!
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| 160 | parallel_lbr_test "-j any_ret" "parallel any ret" 100 &
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| 161 | pid3=$!
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| 162 | parallel_lbr_test "-j ind_call" "parallel any indirect call" 100 &
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| 163 | pid4=$!
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| 164 | parallel_lbr_test "-j ind_jmp" "parallel any indirect jump" 100 &
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| 165 | pid5=$!
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| 166 | parallel_lbr_test "-j call" "parallel direct calls" 100 &
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| 167 | pid6=$!
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| 168 | parallel_lbr_test "-j ind_call,u" "parallel any indirect user call" 100 &
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| 169 | pid7=$!
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| 170 | if ParanoidAndNotRoot 1
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| 171 | then
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| 172 | pid8=
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| 173 | pid9=
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| 174 | else
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| 175 | parallel_lbr_test "-a -b" "parallel system wide any branch" 100 &
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| 176 | pid8=$!
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| 177 | parallel_lbr_test "-a -j any_call" "parallel system wide any call" 100 &
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| 178 | pid9=$!
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| 179 | fi
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| 180 |
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| 181 | for pid in $pid1 $pid2 $pid3 $pid4 $pid5 $pid6 $pid7 $pid8 $pid9
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| 182 | do
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| 183 | set +e
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| 184 | wait $pid
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| 185 | child_err=$?
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| 186 | set -e
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| 187 | if ([ $err -eq 2 ] && [ $child_err -eq 1 ]) || [ $err -eq 0 ]
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| 188 | then
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| 189 | err=$child_err
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| 190 | fi
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| 191 | done
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| 192 |
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| 193 | cleanup
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| 194 | exit $err
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