[PATCH v4 8/8] selftests: ftrace: Add wprobe trigger testcase
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2025-09-14 14:11:08
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 a testcase for checking wprobe trigger. This sets set_wprobe and clear_wprobe triggers on fprobe events to watch dentry access. So this depends on both wprobe and fprobe. Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> --- Changes in v3: - Newly added. --- .../ftrace/test.d/trigger/trigger-wprobe.tc | 48 ++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc
new file mode 100644
index 000000000000..a012f7b92405
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc@@ -0,0 +1,48 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test wprobe trigger +# requires: dynamic_events "w[:[<group>/][<event>]] [r|w|rw]@<addr>[:<len>]":README events/sched/sched_process_fork/trigger + +echo 0 > tracing_on + +:;: "Add a wprobe event used by trigger" ;: +echo 'w:watch rw@0:8 address=$addr value=+0($addr)' > dynamic_events + +:;: "Add events for triggering wprobe" ;: +echo 'f:truncate do_truncate dentry=$arg2' >> dynamic_events +echo 'f:dentry_kill __dentry_kill dentry=$arg1' >> dynamic_events + +:;: "Add wprobe triggers" ;: +echo 'set_wprobe:watch:dentry' >> events/fprobes/truncate/trigger +echo 'clear_wprobe:watch:dentry' >> events/fprobes/dentry_kill/trigger +cat events/fprobes/truncate/trigger | grep ^set_wprobe +cat events/fprobes/dentry_kill/trigger | grep ^clear_wprobe + +:;: "Ensure wprobe is still disabled" ;: +cat events/wprobes/watch/enable | grep 0 + +:;: "Enable events for triggers" ;: +echo 1 >> events/fprobes/truncate/enable +echo 1 >> events/fprobes/dentry_kill/enable + +:;: "Start test workload" ;: +echo 1 >> tracing_on + +echo aaa > /tmp/hoge +echo bbb > /tmp/hoge +echo ccc > /tmp/hoge +rm /tmp/hoge + +:;: "Check trace results" ;: +cat trace | grep watch + +:;: "Ensure wprobe becomes disabled again" ;: +cat events/wprobes/watch/enable | grep 0 + +:;: "Remove wprobe triggers" ;: +echo '!set_wprobe:watch:dentry' >> events/fprobes/truncate/trigger +echo '!clear_wprobe:watch' >> events/fprobes/dentry_kill/trigger +! grep ^set_wprobe events/fprobes/truncate/trigger +! grep ^clear_wprobe events/fprobes/dentry_kill/trigger + +exit 0
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