diff --git a/study/kernel/01-process/01-task/print_thread_info/Makefile b/study/kernel/01-process/01-task/print_thread_info/Makefile
index 7e5233b..0eaf9d8 100644
--- a/study/kernel/01-process/01-task/print_thread_info/Makefile
+++ b/study/kernel/01-process/01-task/print_thread_info/Makefile
@@ -1,6 +1,6 @@
 ifneq ($(KERNELRELEASE),)
 
-obj-m := print_vmarea.o
+obj-m := print_thread_info.o
 
 else
 
@@ -14,5 +14,15 @@ all:
 clean:
 	make -C $(KERNELDIR) M=$(PWD) clean
 
+insmod:
+	sudo insmod ./print_thread_info.ko
+
+rmmod:
+	sudo rmmod print_thread_info
+
+reinsmod:
+	make rmmod
+	make insmod
+
 
 endif
diff --git a/study/kernel/01-process/01-task/print_thread_info/print_thread_info.c b/study/kernel/01-process/01-task/print_thread_info/print_thread_info.c
index 799b1aa..21c5a58 100644
--- a/study/kernel/01-process/01-task/print_thread_info/print_thread_info.c
+++ b/study/kernel/01-process/01-task/print_thread_info/print_thread_info.c
@@ -18,49 +18,83 @@
 #endif
 
 
-static int pid = 1;
+static int PID = 1;
 
-module_param(pid,int,0644);
+module_param(PID, int, 0644);
 
-static void print_thread_info_list(void)
-{
-	struct task_struct *ptask;
-	struct pid *k;
-	struct vm_area_struct *tmp;
-
-    /* find tak by pid */
-	k = find_vpid(pid);
-	ptask = pid_task(k, PIDTYPE_PID);
-
-	printk("process:%s,pid:%d\n",p->comm,p->pid);
-
-}
-
-
-struct thread_info* get_threaf_info_by_task(struct task_struct *ptask)
+
+struct thread_info* get_thread_info(struct task_struct *ptask)
 {
+    printk(KERN_INFO "THREAD_SIZE : %dKB", THREAD_SIZE / 1024);
     struct thread_info   *threadinfo = NULL;
 
     /* for the struct task_struct *task is the member of the struct thread_info
      * we can find the threadinfo by task use container_of  */
     threadinfo = container_of(ptask, struct thread_info, task);
-
-    /* for the struct task_struct *task is the member of the struct thread_info
-     * we can find the threadinfo or stack by
-     */
-    threadinfo = (struct thread_info *)ptask;
+    printk(KERN_INFO "thread_info : %p", threadinfo);
 
 
     return threadinfo;
 }
 
-
-void print_thread_info(struct thread_info *pthreadinfo)
+union thread_union* get_thread_union(struct thread_info *threadinfo)
 {
-    printk(KERN_INFO "THREAD_SIZE : %d\n", THREAD_SZIE)
+    union thread_union *threadunion = NULL;
+    /* for the struct thread_info is the first member of the struct thread_info
+     * we can find the threadinfo or stack by thread_info
+     */
+    threadunion = (union thread_union *)threadinfo;
+    printk(KERN_INFO "thread_union address : %p\n", threadunion);
+    threadunion = NULL;
+    threadunion = container_of(threadinfo, union thread_union, thread_info);
+    printk(KERN_INFO "thread_union address : %p\n", threadunion);
+
+    return threadunion;
 }
 
 
+unsigned long show_kstack(union thread_union *thread_union)
+{
+    unsigned long *kstack = (unsigned long *)thread_union->stack;
+    unsigned length = THREAD_SIZE / sizeof(unsigned long) - 1;
+    unsigned long ksatck_start = kstack + sizeof(struct thread_info);
+    unsigned long kstack_end = kstack + length;
+    printk(KERN_INFO "sizeof(struct thread_info) : %d\n", sizeof(struct thread_info));
+    printk(KERN_INFO "kstack start   : %p\n", kstack + sizeof(struct thread_info));
+    printk(KERN_INFO "kstack end : %p\n", kstack + length);
+
+
+}
+
+static void print_thread_info(int pid)
+{
+	struct task_struct *ptask;
+	struct pid *k;
+	struct vm_area_struct *tmp;
+    struct thread_info *threadinfo = NULL;
+    union thread_union *threadunion = NULL;
+    /* find tak by pid */
+	k = find_vpid(pid);
+	ptask = pid_task(k, PIDTYPE_PID);
+
+	printk(KERN_INFO "process : %s, pid : %d\n", ptask->comm, ptask->pid);
+	printk(KERN_INFO "stack : %p\n", ptask->stack);
+
+    threadinfo = get_thread_info(ptask);
+    threadunion = get_thread_union(threadinfo);
+    show_kstack(threadunion);
+}
+
+
+
+
+static int __init print_thread_info_init(void)
+{
+    print_thread_info(PID);
+
+    return 0;
+}
+
 static void __exit print_thread_info_exit(void)
 {
    printk(KERN_INFO "exit ---------------------!\n");