From: Arnaldo Carvalho de Melo <[email protected]>
This test uses the 'perf test shell' library to add probe:vfs_getname to the
system then use it with 'perf record' using 'touch' to write to a temp file,
then checks that that was captured by the vfs_getname probe in the generated
perf.data file, with the temp file name as the pathname argument.
Using it:
# perf test "Use vfs_getname"
60: Use vfs_getname probe to get syscall args filenames: Ok
# perf test -v "Use vfs_getname"
60: Use vfs_getname probe to get syscall args filenames:
--- start ---
test child forked, pid 16414
Added new event:
probe:vfs_getname (on getname_flags:72 with pathname=result->name:string)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_getname -aR sleep 1
Recording open file:
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.022 MB /tmp/vaca.perf.data.QZsn7 (13
samples) ]
Looking at perf.data file for vfs_getname records for the file we touched:
touch 16421 [002] 1255152.879561: probe:vfs_getname:
(ffffffffa626e608) pathname="/tmp/vaca.l10SL"
test child finished with 0
---- end ----
Use vfs_getname probe to get syscall args filenames: Ok
#
Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
.../tests/shell/record+script_probe_vfs_getname.sh | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100755 tools/perf/tests/shell/record+script_probe_vfs_getname.sh
diff --git a/tools/perf/tests/shell/record+script_probe_vfs_getname.sh
b/tools/perf/tests/shell/record+script_probe_vfs_getname.sh
new file mode 100755
index 000000000000..2725c5db699a
--- /dev/null
+++ b/tools/perf/tests/shell/record+script_probe_vfs_getname.sh
@@ -0,0 +1,37 @@
+# Use vfs_getname probe to get syscall args filenames
+
+# Uses the 'perf test shell' library to add probe:vfs_getname to the system
+# then use it with 'perf record' using 'touch' to write to a temp file, then
+# checks that that was captured by the vfs_getname probe in the generated
+# perf.data file, with the temp file name as the pathname argument.
+
+# Arnaldo Carvalho de Melo <[email protected]>, 2017
+
+. $(dirname $0)/lib/probe_vfs_getname.sh
+
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+file=$(mktemp /tmp/temporary_file.XXXXX)
+
+record_open_file() {
+ echo "Recording open file:"
+ perf record -o ${perfdata} -e probe:vfs_getname touch $file
+}
+
+perf_script_filenames() {
+ echo "Looking at perf.data file for vfs_getname records for the file we
touched:"
+ perf script -i ${perfdata} | \
+ egrep " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname:
+\([[:xdigit:]]+\) +pathname=\"${file}\""
+}
+
+add_probe_vfs_getname || skip_if_no_debuginfo
+err=$?
+if [ $err -ne 0 ] ; then
+ exit $err
+fi
+
+record_open_file && perf_script_filenames
+err=$?
+rm -f ${perfdata}
+rm -f ${file}
+cleanup_probe_vfs_getname
+exit $err
--
2.13.4
