[PATCH v4 6/8] selftests: tracing: Add a basic testcase for wprobe
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2025-09-14 14:10:47
Also in:
linux-doc, linux-perf-users, lkml
Subsystem:
kernel selftest framework, the rest, tracing · Maintainers:
Shuah Khan, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: Masami Hiramatsu (Google) <mhiramat@kernel.org> Add 'add_remove_wprobe.tc' testcase for testing wprobe event that tests adding and removing operations of the wprobe event. Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> --- .../ftrace/test.d/dynevent/add_remove_wprobe.tc | 68 ++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc
new file mode 100644
index 000000000000..20774c7f69f8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc@@ -0,0 +1,68 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Generic dynamic event - add/remove wprobe events +# requires: dynamic_events "w[:[<group>/][<event>]] [r|w|rw]@<addr>[:<len>]":README + +echo 0 > events/enable +echo > dynamic_events + +# Use jiffies as a variable that is frequently written to. +TARGET=jiffies + +echo "w:my_wprobe w@$TARGET" >> dynamic_events + +grep -q my_wprobe dynamic_events +if [ $? -ne 0 ]; then + echo "Failed to create wprobe event" + exit_fail +fi + +test -d events/wprobes/my_wprobe +if [ $? -ne 0 ]; then + echo "Failed to create wprobe event directory" + exit_fail +fi + +echo 1 > events/wprobes/my_wprobe/enable + +# Check if the event is enabled +cat events/wprobes/my_wprobe/enable | grep -q 1 +if [ $? -ne 0 ]; then + echo "Failed to enable wprobe event" + exit_fail +fi + +# Let some time pass to trigger the breakpoint +sleep 1 + +# Check if we got any trace output +if !grep -q my_wprobe trace; then + echo "wprobe event was not triggered" +fi + +echo 0 > events/wprobes/my_wprobe/enable + +# Check if the event is disabled +cat events/wprobes/my_wprobe/enable | grep -q 0 +if [ $? -ne 0 ]; then + echo "Failed to disable wprobe event" + exit_fail +fi + +echo "-:my_wprobe" >> dynamic_events + +! grep -q my_wprobe dynamic_events +if [ $? -ne 0 ]; then + echo "Failed to remove wprobe event" + exit_fail +fi + +! test -d events/wprobes/my_wprobe +if [ $? -ne 0 ]; then + echo "Failed to remove wprobe event directory" + exit_fail +fi + +clear_trace + +exit 0