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Commit 231e36f4 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Ingo Molnar
Browse files

tracing/kprobe: Update kprobe tracing self test for new syntax 



Update kprobe tracing self test for new syntax (it supports
deleting individual probes, and drops $argN support)
and behavior change (new probes are disabled in default).

This selftest includes the following checks:

 - Adding function-entry probe and return probe with arguments.
 - Enabling these probes.
 - Deleting it individually.

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100114051211.7814.29436.stgit@localhost6.localdomain6>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0eda7385

kernel/trace/trace_kprobe.c

+47 −8
Original line number Diff line number Diff line
@@ -1507,27 +1507,66 @@ static int kprobe_trace_selftest_target(int a1, int a2, int a3, 


static __init int kprobe_trace_self_tests_init(void)

{

	int ret;

	int ret, warn = 0;

	int (*target)(int, int, int, int, int, int);

	struct trace_probe *tp;



	target = kprobe_trace_selftest_target;



	pr_info("Testing kprobe tracing: ");



	ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "

				  "$arg1 $arg2 $arg3 $arg4 $stack $stack0");

	if (WARN_ON_ONCE(ret))

		pr_warning("error enabling function entry\n");

				  "$stack $stack0 +0($stack)");

	if (WARN_ON_ONCE(ret)) {

		pr_warning("error on probing function entry.\n");

		warn++;

	} else {

		/* Enable trace point */

		tp = find_probe_event("testprobe", KPROBE_EVENT_SYSTEM);

		if (WARN_ON_ONCE(tp == NULL)) {

			pr_warning("error on getting new probe.\n");

			warn++;

		} else

			probe_event_enable(&tp->call);

	}



	ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "

				  "$retval");

	if (WARN_ON_ONCE(ret))

		pr_warning("error enabling function return\n");

	if (WARN_ON_ONCE(ret)) {

		pr_warning("error on probing function return.\n");

		warn++;

	} else {

		/* Enable trace point */

		tp = find_probe_event("testprobe2", KPROBE_EVENT_SYSTEM);

		if (WARN_ON_ONCE(tp == NULL)) {

			pr_warning("error on getting new probe.\n");

			warn++;

		} else

			probe_event_enable(&tp->call);

	}



	if (warn)

		goto end;



	ret = target(1, 2, 3, 4, 5, 6);



	cleanup_all_probes();

	ret = command_trace_probe("-:testprobe");

	if (WARN_ON_ONCE(ret)) {

		pr_warning("error on deleting a probe.\n");

		warn++;

	}



	ret = command_trace_probe("-:testprobe2");

	if (WARN_ON_ONCE(ret)) {

		pr_warning("error on deleting a probe.\n");

		warn++;

	}



end:

	cleanup_all_probes();

	if (warn)

		pr_cont("NG: Some tests are failed. Please check them.\n");

	else

		pr_cont("OK\n");

	return 0;

}