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

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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: Masami 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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2010-01-14 00:12:12 -05:00 committed by Ingo Molnar
parent 0eda7385db
commit 231e36f4d2
1 changed files with 47 additions and 8 deletions
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55
kernel/trace/trace_kprobe.c
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@ -1507,28 +1507,67 @@ static int kprobe_trace_selftest_target(int a1, int a2, int a3,
static __init int kprobe_trace_self_tests_init(void) static __init int kprobe_trace_self_tests_init(void)
{ {
int ret; int ret, warn = 0;
int (*target)(int, int, int, int, int, int); int (*target)(int, int, int, int, int, int);
struct trace_probe *tp;
target = kprobe_trace_selftest_target; target = kprobe_trace_selftest_target;
pr_info("Testing kprobe tracing: "); pr_info("Testing kprobe tracing: ");
ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target " ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "
"$arg1 $arg2 $arg3 $arg4 $stack $stack0"); "$stack $stack0 +0($stack)");
if (WARN_ON_ONCE(ret)) if (WARN_ON_ONCE(ret)) {
pr_warning("error enabling function entry\n"); 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 " ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "
"$retval"); "$retval");
if (WARN_ON_ONCE(ret)) if (WARN_ON_ONCE(ret)) {
pr_warning("error enabling function return\n"); 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); 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++;
}
pr_cont("OK\n"); 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; return 0;
} }