[PATCH v3 26/27] selftests/ftrace: Add function_graph tracer to func-filter-pid test

Steven Rostedt
2024-06-03T19:07:14Z

From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

The function tracer is tested to see if pid filtering works. Add a test to
test function_graph tracer as well, but only if the function_graph tracer
is enabled for the top level or instance.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
.../ftrace/test.d/ftrace/func-filter-pid.tc | 27 +++++++++++++++----
1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
index 2f7211254529..c6fc9d31a496 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
@@ -14,6 +14,11 @@ if [ ! -f options/function-fork ]; then
echo "no option for function-fork found. Option will not be tested."
fi

+if [ ! -f options/funcgraph-proc ]; then
+ do_funcgraph_proc=0
+ echo "no option for function-fork found. Option will not be tested."
+fi
+
read PID _ < /proc/self/stat

if [ $do_function_fork -eq 1 ]; then
@@ -21,12 +26,18 @@ if [ $do_function_fork -eq 1 ]; then
orig_value=`grep function-fork trace_options`
fi

+if [ $do_funcgraph_proc -eq 1 ]; then
+ orig_value2=`cat options/funcgraph-proc`
+fi
+
do_reset() {
- if [ $do_function_fork -eq 0 ]; then
- return
+ if [ $do_function_fork -eq 1 ]; then
+ echo $orig_value > trace_options
fi

- echo $orig_value > trace_options
+ if [ $do_funcgraph_proc -eq 1 ]; then
+ echo $orig_value2 > options/funcgraph-proc
+ fi
}

fail() { # msg
@@ -36,13 +47,15 @@ fail() { # msg
}

do_test() {
+ TRACER=$1
+
disable_tracing

echo do_execve* > set_ftrace_filter
echo $FUNCTION_FORK >> set_ftrace_filter

echo $PID > set_ftrace_pid
- echo function > current_tracer
+ echo $TRACER > current_tracer

if [ $do_function_fork -eq 1 ]; then
# don't allow children to be traced
@@ -82,7 +95,11 @@ do_test() {
fi
}

-do_test
+do_test function
+if grep -s function_graph available_tracers; then
+ do_test function_graph
+fi
+
do_reset

exit 0
--
2.43.0