[tip:perf/core] perf test shell: Add 'probe_vfs_getname' shell test

tip-bot for Arnaldo Carvalho de Melo
2017-08-14T17:49:08Z

Commit-ID: a3534842ddd04675abc67e80432aacc01670cca8
Gitweb: http://git.kernel.org/tip/a3534842ddd04675abc67e80432aacc01670cca8
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Thu, 3 Aug 2017 16:54:53 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 11 Aug 2017 16:06:28 -0300

perf test shell: Add 'probe_vfs_getname' shell test

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 <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-8f3n22c1yn516ev30s603ow2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/shell/probe_vfs_getname.sh | 30 +++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

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 0000000..d5f5248
--- /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 <acme@kernel.org>, 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