# Use vfs_getname probe to get syscall args filenames
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# Uses the 'perf test shell' library to add probe:vfs_getname to the system
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# then use it with 'perf record' using 'touch' to write to a temp file, then
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# checks that that was captured by the vfs_getname probe in the generated
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# perf.data file, with the temp file name as the pathname argument.
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# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
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. $(dirname $0)/lib/probe.sh
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skip_if_no_perf_probe || exit 2
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. $(dirname $0)/lib/probe_vfs_getname.sh
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perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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file=$(mktemp /tmp/temporary_file.XXXXX)
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record_open_file() {
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echo "Recording open file:"
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perf record -o ${perfdata} -e probe:vfs_getname touch $file
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}
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perf_script_filenames() {
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echo "Looking at perf.data file for vfs_getname records for the file we touched:"
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perf script -i ${perfdata} | \
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egrep " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname: +\([[:xdigit:]]+\) +pathname=\"${file}\""
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}
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add_probe_vfs_getname || skip_if_no_debuginfo
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err=$?
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if [ $err -ne 0 ] ; then
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exit $err
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fi
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record_open_file && perf_script_filenames
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err=$?
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rm -f ${perfdata}
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rm -f ${file}
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cleanup_probe_vfs_getname
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exit $err
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