From: Arnaldo Carvalho de Melo <[email protected]>
First perf shell test:
# perf test vfs_getname
60: Add vfs_getname probe to get syscall args filenames: Ok
#
In verbose mode:
# perf test -v vfs_getname
60: Add vfs_getname probe to get syscall args filenames:
--- start ---
test child forked, pid 19146
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
test child finished with 0
---- end ----
Add vfs_getname probe to get syscall args filenames: Ok
#
And if the vmlinux file is not found:
# mv ../build/v4.12.0-rc6+/vmlinux ../build/v4.12.0-rc6+/vmlinux.hidden
# perf test vfs_getname
60: Add vfs_getname probe to get syscall args filenames: Skip
#
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]>
---
tools/perf/tests/shell/probe_vfs_getname.sh | 30 +++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100755 tools/perf/tests/shell/probe_vfs_getname.sh
diff --git a/tools/perf/tests/shell/probe_vfs_getname.sh
b/tools/perf/tests/shell/probe_vfs_getname.sh
new file mode 100755
index 000000000000..d5f5248de927
--- /dev/null
+++ b/tools/perf/tests/shell/probe_vfs_getname.sh
@@ -0,0 +1,30 @@
+# Add vfs_getname probe to get syscall args filenames
+#
+# Arnaldo Carvalho de Melo <[email protected]>, 2017
+
+perf probe -l | grep -q probe:vfs_getname
+had_vfs_getname=$?
+
+cleanup_probe_vfs_getname() {
+ if [ $had_vfs_getname -eq 1 ] ; then
+ perf probe -q -d probe:vfs_getname
+ fi
+}
+
+add_probe_vfs_getname() {
+ local verbose=$1
+ if [ $had_vfs_getname -eq 1 ] ; then
+ line=$(perf probe -L getname_flags | egrep
'result.*=.*filename;' | sed -r
's/[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*/\1/')
+ perf probe $verbose "vfs_getname=getname_flags:${line}
pathname=result->name:string"
+ fi
+}
+
+skip_if_no_debuginfo() {
+ add_probe_vfs_getname -v 2>&1 | grep -q "^Failed to find the path for
kernel" && return 2
+ return 1
+}
+
+add_probe_vfs_getname || skip_if_no_debuginfo
+err=$?
+cleanup_probe_vfs_getname
+exit $err
--
2.13.4
