52 lines
1.2 KiB
Bash
52 lines
1.2 KiB
Bash
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#!/bin/sh
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# perf trace exit race
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# SPDX-License-Identifier: GPL-2.0
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# Check that the last events of a perf trace'd subprocess are not
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# lost. Specifically, trace the exiting syscall of "true" 10 times and ensure
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# the output contains 10 correct lines.
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# shellcheck source=lib/probe.sh
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. "$(dirname $0)"/lib/probe.sh
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skip_if_no_perf_trace || exit 2
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if [ "$1" = "-v" ]; then
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verbose="1"
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fi
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iter=10
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regexp=" +[0-9]+\.[0-9]+ [0-9]+ syscalls:sys_enter_exit_group\(\)$"
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trace_shutdown_race() {
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for _ in $(seq $iter); do
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perf trace --no-comm -e syscalls:sys_enter_exit_group true 2>>$file
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done
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result="$(grep -c -E "$regexp" $file)"
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[ $result = $iter ]
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}
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file=$(mktemp /tmp/temporary_file.XXXXX)
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# Do not use whatever ~/.perfconfig file, it may change the output
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# via trace.{show_timestamp,show_prefix,etc}
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export PERF_CONFIG=/dev/null
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trace_shutdown_race
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err=$?
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if [ $err != 0 ] && [ "${verbose}" = "1" ]; then
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lines_not_matching=$(mktemp /tmp/temporary_file.XXXXX)
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if grep -v -E "$regexp" $file > $lines_not_matching ; then
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echo "Lines not matching the expected regexp: '$regexp':"
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cat $lines_not_matching
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else
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echo "Missing output, expected $iter but only got $result"
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fi
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rm -f $lines_not_matching
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fi
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rm -f ${file}
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exit $err
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