Root/samples/trace_events/trace-events-sample.c

1#include <linux/module.h>
2#include <linux/kthread.h>
3
4/*
5 * Any file that uses trace points, must include the header.
6 * But only one file, must include the header by defining
7 * CREATE_TRACE_POINTS first. This will make the C code that
8 * creates the handles for the trace points.
9 */
10#define CREATE_TRACE_POINTS
11#include "trace-events-sample.h"
12
13
14static void simple_thread_func(int cnt)
15{
16    set_current_state(TASK_INTERRUPTIBLE);
17    schedule_timeout(HZ);
18    trace_foo_bar("hello", cnt);
19}
20
21static int simple_thread(void *arg)
22{
23    int cnt = 0;
24
25    while (!kthread_should_stop())
26        simple_thread_func(cnt++);
27
28    return 0;
29}
30
31static struct task_struct *simple_tsk;
32
33static int __init trace_event_init(void)
34{
35    simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
36    if (IS_ERR(simple_tsk))
37        return -1;
38
39    return 0;
40}
41
42static void __exit trace_event_exit(void)
43{
44    kthread_stop(simple_tsk);
45}
46
47module_init(trace_event_init);
48module_exit(trace_event_exit);
49
50MODULE_AUTHOR("Steven Rostedt");
51MODULE_DESCRIPTION("trace-events-sample");
52MODULE_LICENSE("GPL");
53

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