Steven Rostedt | 9cfe06f | 2009-04-14 21:37:03 -0400 | [diff] [blame^] | 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 | |
| 14 | static 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 | if (!(cnt % 10)) |
| 21 | /* It is really important that I say "hi!" */ |
| 22 | printk(KERN_EMERG "hi!\n"); |
| 23 | } |
| 24 | |
| 25 | static int simple_thread(void *arg) |
| 26 | { |
| 27 | int cnt = 0; |
| 28 | |
| 29 | while (!kthread_should_stop()) |
| 30 | simple_thread_func(cnt++); |
| 31 | |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | static struct task_struct *simple_tsk; |
| 36 | |
| 37 | static int __init trace_event_init(void) |
| 38 | { |
| 39 | simple_tsk = kthread_run(simple_thread, NULL, "event-sample"); |
| 40 | if (IS_ERR(simple_tsk)) |
| 41 | return -1; |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static void __exit trace_event_exit(void) |
| 47 | { |
| 48 | kthread_stop(simple_tsk); |
| 49 | } |
| 50 | |
| 51 | module_init(trace_event_init); |
| 52 | module_exit(trace_event_exit); |
| 53 | |
| 54 | MODULE_AUTHOR("Steven Rostedt"); |
| 55 | MODULE_DESCRIPTION("trace-events-sample"); |
| 56 | MODULE_LICENSE("GPL"); |