LXR linux/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