diff --git a/source/module/monitor_kernel.c b/source/module/monitor_kernel.c
index 77ac231..79d8103 100644
--- a/source/module/monitor_kernel.c
+++ b/source/module/monitor_kernel.c
@@ -21,8 +21,7 @@ struct my_device_data {
 
 static int device_open(struct inode *inode, struct file *file) {
   struct my_device_data *data;
-  printk(KERN_INFO "variable_monitor fun: %s with pid %d\n", __FUNCTION__,
-         current->pid);
+  printk(KERN_INFO "variable_monitor open device with pid %d\n", current->pid);
   // save pid
   data = kmalloc(sizeof(*data), GFP_KERNEL);
   if (!data)
@@ -35,8 +34,7 @@ static int device_open(struct inode *inode, struct file *file) {
 static int device_release(struct inode *inode, struct file *file) {
   // load pid
   struct my_device_data *data = file->private_data;
-  printk(KERN_INFO "variable_monitor fun: %s with pid %d\n", __FUNCTION__,
-         data->pid);
+  printk(KERN_INFO "variable_monitor release device with pid %d\n", data->pid);
   // clear watch with pid
   clear_watch(data->pid);
   kfree(data); // free data memory
diff --git a/source/module/monitor_kernel_lib.c b/source/module/monitor_kernel_lib.c
index 09f3a13..0b18e4d 100644
--- a/source/module/monitor_kernel_lib.c
+++ b/source/module/monitor_kernel_lib.c
@@ -315,17 +315,15 @@ int start_watch_variable(watch_arg warg) {
   timer = get_timer(warg.time_ns); // get a valuable timer
 
   if (timer == NULL) {
-    printk(KERN_ERR "Timer is full\n");
+    printk(KERN_ERR "No timer available, ALL timer is full\n");
     return -1;
   }
 
   INIT_WORK(&timer->wk, diag_task_info_work);
 
-  printk(KERN_INFO "ptr transform kptr: %p\n", kptr);
-  printk(KERN_INFO "timer: %p\n", timer);
-  printk(KERN_INFO "timer->sentinel: %d, timer->time_ns: %lld\n",
-         timer->sentinel, timer->time_ns);
-  printk(KERN_INFO "timer->hr_timer: %p\n", &timer->hr_timer);
+  printk(KERN_INFO "Convert ptr to kptr: %p\n", kptr);
+  printk(KERN_INFO "Associated timer: %p , there are already %d variables, timer period %lld.\n", timer, timer->sentinel, timer->time_ns);
+  // printk(KERN_INFO "timer->hr_timer: %p\n", &timer->hr_timer);
 
   TIMER_CANCEL(timer); // just in case
   timer_add_watch(timer, k_watch_arg);
diff --git a/source/module/monitor_timer.c b/source/module/monitor_timer.c
index d669b76..f23e330 100644
--- a/source/module/monitor_timer.c
+++ b/source/module/monitor_timer.c
@@ -67,7 +67,6 @@ kernel_watch_timer *get_timer(unsigned long long time_ns) {
   }
   // if all timer is full
   if (i >= MAX_TIMER_NUM) {
-    printk(KERN_ERR "No timer available\n");
     return NULL;
   }
   // if a new timer, init it
@@ -97,7 +96,7 @@ kernel_watch_timer *get_timer(unsigned long long time_ns) {
 unsigned char timer_add_watch(kernel_watch_timer *timer,
                               kernel_watch_arg k_watch_arg) {
   if (TIMER_FILLED(timer)) {
-    printk(KERN_ERR "Timer is full\n");
+    printk(KERN_ERR "ALL Timer is full\n");
     return -1;
   }
   memcpy(&timer->k_watch_args[timer->sentinel], &k_watch_arg,