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authorSteven Rostedt <srostedt@redhat.com>2009-04-14 21:37:03 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-14 22:09:18 -0400
commit9cfe06f8cd5c8c3ad6ab323973e87dde670642b8 (patch)
tree94348ca2c013264e45d352d208c4a6dc9c221eef /samples/trace_events/trace-events-sample.c
parentad8d75fff811a6a230f7f43b05a6483099349533 (diff)
downloadlinux-9cfe06f8cd5c8c3ad6ab323973e87dde670642b8.tar.gz
tracing/events: add trace-events-sample
This patch adds a sample to the samples directory on how to create and use TRACE_EVENT trace points. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'samples/trace_events/trace-events-sample.c')
-rw-r--r--samples/trace_events/trace-events-sample.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
new file mode 100644
index 000000000000..f33b3ba744ac
--- /dev/null
+++ b/samples/trace_events/trace-events-sample.c
@@ -0,0 +1,56 @@
+#include <linux/module.h>
+#include <linux/kthread.h>
+
+/*
+ * Any file that uses trace points, must include the header.
+ * But only one file, must include the header by defining
+ * CREATE_TRACE_POINTS first. This will make the C code that
+ * creates the handles for the trace points.
+ */
+#define CREATE_TRACE_POINTS
+#include "trace-events-sample.h"
+
+
+static void simple_thread_func(int cnt)
+{
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(HZ);
+ trace_foo_bar("hello", cnt);
+
+ if (!(cnt % 10))
+ /* It is really important that I say "hi!" */
+ printk(KERN_EMERG "hi!\n");
+}
+
+static int simple_thread(void *arg)
+{
+ int cnt = 0;
+
+ while (!kthread_should_stop())
+ simple_thread_func(cnt++);
+
+ return 0;
+}
+
+static struct task_struct *simple_tsk;
+
+static int __init trace_event_init(void)
+{
+ simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
+ if (IS_ERR(simple_tsk))
+ return -1;
+
+ return 0;
+}
+
+static void __exit trace_event_exit(void)
+{
+ kthread_stop(simple_tsk);
+}
+
+module_init(trace_event_init);
+module_exit(trace_event_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("trace-events-sample");
+MODULE_LICENSE("GPL");