[bpf,3/3] selftests/bpf: test function_graph tracer and bpf trampoline together
diff mbox series

Message ID 20191209000114.1876138-4-ast@kernel.org
State Accepted
Delegated to: BPF Maintainers
Headers show
Series
  • bpf: Make BPF trampoline friendly to ftrace
Related show

Commit Message

Alexei Starovoitov Dec. 9, 2019, 12:01 a.m. UTC
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@kernel.org>
---
 tools/testing/selftests/bpf/test_ftrace.sh | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 tools/testing/selftests/bpf/test_ftrace.sh

Patch
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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