trace-events-sample.c

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#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);
}

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");