netdev - [PATCH bpf 3/3] selftests/bpf: test function_graph tracer and bpf trampoline together

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Message-ID: <20191209000114.1876138-4-ast@kernel.org>
Date:   Sun, 8 Dec 2019 16:01:14 -0800
From:   Alexei Starovoitov <ast@...nel.org>
To:     <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <rostedt@...dmis.org>, <x86@...nel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <kernel-team@...com>
Subject: [PATCH bpf 3/3] selftests/bpf: test function_graph tracer and bpf trampoline together

Add simple test script to execute funciton graph tracer while BPF trampoline
attaches and detaches from the functions being graph traced.

Signed-off-by: Alexei Starovoitov <ast@...nel.org>
---
 tools/testing/selftests/bpf/test_ftrace.sh | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 tools/testing/selftests/bpf/test_ftrace.sh

diff --git a/tools/testing/selftests/bpf/test_ftrace.sh b/tools/testing/selftests/bpf/test_ftrace.sh
new file mode 100755
index 000000000000..20de7bb873bc
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_ftrace.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+TR=/sys/kernel/debug/tracing/
+clear_trace() { # reset trace output
+    echo > $TR/trace
+}
+
+disable_tracing() { # stop trace recording
+    echo 0 > $TR/tracing_on
+}
+
+enable_tracing() { # start trace recording
+    echo 1 > $TR/tracing_on
+}
+
+reset_tracer() { # reset the current tracer
+    echo nop > $TR/current_tracer
+}
+
+disable_tracing
+clear_trace
+
+echo "" > $TR/set_ftrace_filter
+echo '*printk* *console* *wake* *serial* *lock*' > $TR/set_ftrace_notrace
+
+echo "bpf_prog_test*" > $TR/set_graph_function
+echo "" > $TR/set_graph_notrace
+
+echo function_graph > $TR/current_tracer
+
+enable_tracing
+./test_progs -t fentry
+./test_progs -t fexit
+disable_tracing
+clear_trace
+
+reset_tracer
+
+exit 0
-- 
2.23.0