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authorAlexei Starovoitov <ast@kernel.org>2019-12-08 16:01:14 -0800
committerAlexei Starovoitov <ast@kernel.org>2019-12-11 15:19:29 -0800
commit7f193c2519a3dcfd61cd5e676b2959370f4b15be (patch)
tree4791cb467f027a8f445513b02c738e67a9644740 /tools
parentb91e014f078e2e4f24778680e28dbbdecc7f0eb9 (diff)
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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@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191209000114.1876138-4-ast@kernel.org
Diffstat (limited to 'tools')
-rwxr-xr-xtools/testing/selftests/bpf/test_ftrace.sh39
1 files changed, 39 insertions, 0 deletions
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