linux-kernel - [PATCH v2 26/27] selftests/ftrace: Add function

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Date: Sat, 01 Jun 2024 23:38:10 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Alexei Starovoitov <alexei.starovoitov@...il.com>,
 Florent Revest <revest@...omium.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>,
 bpf <bpf@...r.kernel.org>,
 Sven Schnelle <svens@...ux.ibm.com>,
 Alexei Starovoitov <ast@...nel.org>,
 Jiri Olsa <jolsa@...nel.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Alan Maguire <alan.maguire@...cle.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 Guo Ren <guoren@...nel.org>,
 linux-kselftest@...r.kernel.org
Subject: [PATCH v2 26/27] selftests/ftrace: Add function_graph tracer to func-filter-pid test

From: "Steven Rostedt (Google)" <rostedt@...dmis.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.

Cc: linux-kselftest@...r.kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.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