1#!/bin/sh 2# Use vfs_getname probe to get syscall args filenames 3 4# Uses the 'perf test shell' library to add probe:vfs_getname to the system 5# then use it with 'perf record' using 'touch' to write to a temp file, then 6# checks that that was captured by the vfs_getname probe in the generated 7# perf.data file, with the temp file name as the pathname argument. 8 9# SPDX-License-Identifier: GPL-2.0 10# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017 11 12# shellcheck source=lib/probe.sh 13. "$(dirname "$0")/lib/probe.sh" 14 15skip_if_no_perf_probe || exit 2 16 17# shellcheck source=lib/probe_vfs_getname.sh 18. "$(dirname "$0")/lib/probe_vfs_getname.sh" 19 20record_open_file() { 21 echo "Recording open file:" 22 # Check presence of libtraceevent support to run perf record 23 skip_no_probe_record_support "probe:vfs_getname*" 24 if [ $? -eq 2 ]; then 25 echo "WARN: Skipping test record_open_file. No libtraceevent support" 26 return 2 27 fi 28 perf record -o ${perfdata} -e probe:vfs_getname\* touch $file 29} 30 31perf_script_filenames() { 32 echo "Looking at perf.data file for vfs_getname records for the file we touched:" 33 perf script -i ${perfdata} | \ 34 grep -E " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname[_0-9]*: +\([[:xdigit:]]+\) +pathname=\"${file}\"" 35} 36 37add_probe_vfs_getname || skip_if_no_debuginfo 38err=$? 39if [ $err -ne 0 ] ; then 40 exit $err 41fi 42 43perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) 44file=$(mktemp /tmp/temporary_file.XXXXX) 45 46record_open_file && perf_script_filenames 47err=$? 48rm -f ${perfdata} 49rm -f ${file} 50cleanup_probe_vfs_getname 51exit $err 52