ftrace: sysprof-plugin, add self-tests

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/trace/trace.h

@@ -280,6 +280,10 @@ extern int trace_selftest_startup_wakeup(struct tracer *trace,
 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 					       struct trace_array *tr);
 #endif
+#ifdef CONFIG_SYSPROF_TRACER
+extern int trace_selftest_startup_sysprof(struct tracer *trace,
+					       struct trace_array *tr);
+#endif
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);

kernel/trace/trace_selftest.c

@@ -537,3 +537,31 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
 	return ret;
 }
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
+
+#ifdef CONFIG_SYSPROF_TRACER
+int
+trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
+{
+	unsigned long count;
+	int ret;
+
+	/* start the tracing */
+	tr->ctrl = 1;
+	trace->init(tr);
+	/* Sleep for a 1/10 of a second */
+	msleep(100);
+	/* stop the tracing. */
+	tr->ctrl = 0;
+	trace->ctrl_update(tr);
+	/* check the trace buffer */
+	ret = trace_test_buffer(tr, &count);
+	trace->reset(tr);
+
+	if (!ret && !count) {
+		printk(KERN_CONT ".. no entries found ..");
+		ret = -1;
+	}
+
+	return ret;
+}
+#endif /* CONFIG_SYSPROF_TRACER */

kernel/trace/trace_sysprof.c

@@ -126,7 +126,7 @@ static void start_stack_timers(void)
 	for_each_online_cpu(cpu) {
 		set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 		start_stack_timer(cpu);
-		printk("started timer on cpu%d\n", cpu);
+		printk(KERN_INFO "started sysprof timer on cpu%d\n", cpu);
 	}
 	set_cpus_allowed_ptr(current, &saved_mask);
 }
@@ -136,7 +136,7 @@ static void stop_stack_timer(int cpu)
 	struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
 
 	hrtimer_cancel(hrtimer);
-	printk("cancelled timer on cpu%d\n", cpu);
+	printk(KERN_INFO "cancelled sysprof timer on cpu%d\n", cpu);
 }
 
 static void stop_stack_timers(void)
@@ -200,7 +200,7 @@ static struct tracer stack_trace __read_mostly =
 	.reset		= stack_trace_reset,
 	.ctrl_update	= stack_trace_ctrl_update,
 #ifdef CONFIG_FTRACE_SELFTEST
-	.selftest    = trace_selftest_startup_stack,
+	.selftest    = trace_selftest_startup_sysprof,
 #endif
 };