linux內核驅動 獲取精確時間 計時

程序代碼：
    struct timespec ts;
    ts = current_kernel_time();
    printk(KERN_ALERT "%ld %ld\n", ts.tv_sec, ts.tv_nsec);
    
    struct timeval tv;
    /*獲取時間*/
    do_gettimeofday(&tv);
    printk(KERN_ALERT "now: %ld %ld\n", tv.tv_sec, tv.tv_usec);
    /*設置時間， 時鐘調後5小時*/
    ts.tv_sec = tv.tv_sec + 3600*5;
    do_settimeofday(&ts);
    printk(KERN_ALERT "after 5 hours: %ld %ld\n", tv.tv_sec, tv.tv_usec);

輸出日誌：

Jun 30 23:17:29 localhost kernel: now: 1309447049 608761
Jun 30 23:17:29 localhost kernel: after 5 hours: 1309447049 608761
Jun 30 23:18:13 localhost kernel: Goodbye, cruel world
Jul  1 04:18:22 localhost kernel: Hello, world
Jul  1 04:18:22 localhost kernel: 1309447102 738475231
Jul  1 04:18:22 localhost kernel: now: 1309447102 739073
Jul  1 04:18:22 localhost kernel: after 5 hours: 1309447102 739073