1 # Check open filename arg using perf trace + vfs_getname
3 # Uses the 'perf test shell' library to add probe:vfs_getname to the system
4 # then use it with 'perf trace' using 'touch' to write to a temp file, then
5 # checks that that was captured by the vfs_getname was used by 'perf trace',
6 # that already handles "probe:vfs_getname" if present, and used in the
7 # "open" syscall "filename" argument beautifier.
9 # Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
11 . $(dirname $0)/lib/probe.sh
13 skip_if_no_perf_probe || exit 2
15 . $(dirname $0)/lib/probe_vfs_getname.sh
17 file=$(mktemp /tmp/temporary_file.XXXXX)
19 trace_open_vfs_getname() {
20 test "$(uname -m)" = s390x && { svc="openat"; txt="dfd: +CWD, +"; }
22 perf trace -e ${svc:-open} touch $file 2>&1 | \
23 egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ ${svc:-open}\(${txt}filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
27 add_probe_vfs_getname || skip_if_no_debuginfo
29 if [ $err -ne 0 ] ; then
33 # Do not use whatever ~/.perfconfig file, it may change the output
34 # via trace.{show_timestamp,show_prefix,etc}
35 export PERF_CONFIG=/dev/null
37 trace_open_vfs_getname
40 cleanup_probe_vfs_getname