ftrace: sysprof-plugin, add self-tests

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

3 files changed, 35 insertions, 3 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c460e85e94ed..b2198bc830ae 100644
--- a/kernel/trace/trace.h
+++ b/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);
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 3877dd9102f1..033a6fb2e5ff 100644
--- a/kernel/trace/trace_selftest.c
+++ b/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 */
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index b1137c11ef8b..b78f12f77fca 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/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
 };