diff --git a/study/kernel/01-process/01-task/print_thread_info/1 b/study/kernel/01-process/01-task/print_thread_info/1
new file mode 100755
index 0000000..a3e7156
Binary files /dev/null and b/study/kernel/01-process/01-task/print_thread_info/1 differ
diff --git a/study/kernel/01-process/01-task/print_thread_info/1.c b/study/kernel/01-process/01-task/print_thread_info/1.c
new file mode 100644
index 0000000..3279f36
--- /dev/null
+++ b/study/kernel/01-process/01-task/print_thread_info/1.c
@@ -0,0 +1,19 @@
+/*************************************************************************
+    > File Name: 1.c
+    > Author: gatieme
+    > Created Time: Thu 02 Jun 2016 01:09:41 PM CST
+ ************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+ int main(void)
+{
+
+    long a = 10;
+    long *pa = &a;
+    printf("0x%x, 0x%x\n", ++a, a);
+    printf("%p\n", pa);
+    printf("%p\n", ++pa);
+}
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 400bf79..e9c5364 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
@@ -25,13 +25,12 @@ module_param(PID, int, 0644);
 
 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);
-    printk(KERN_INFO "thread_info : %p", threadinfo);
+    printk(KERN_INFO "thread_info           : %p", threadinfo);
 
 
     return threadinfo;
@@ -44,26 +43,23 @@ union thread_union* get_thread_union(struct thread_info *threadinfo)
      * we can find the threadinfo or stack by thread_info
      */
     threadunion = (union thread_union *)threadinfo;
-    printk(KERN_INFO "thread_union address : %p\n", threadunion);
+    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);
+    printk(KERN_INFO "thread_union address  : %p\n", threadunion);
 
     return threadunion;
 }
 
 
-unsigned long show_kstack(union thread_union *thread_union)
+unsigned long show_kstack(union thread_union *threadunion)
 {
-    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 + THREAD_SIZE);
-
-
+    unsigned long kstack = (unsigned long)threadunion->stack;
+    printk(KERN_INFO "THREAD_SIZE           : %d == %dKB", THREAD_SIZE, THREAD_SIZE / 1024);
+    printk(KERN_INFO "union_stack           : %p\n", (unsigned long)kstack);
+    printk(KERN_INFO "union_stack align     : %p\n", ((unsigned long)kstack & ~(THREAD_SIZE - 1)));
+    printk(KERN_INFO "kstack start          : %p\n", (void *)(((unsigned long) kstack & ~(THREAD_SIZE - 1)) + THREAD_SIZE - 1));
+    printk(KERN_INFO "kstack end            : %p\n", (void *)(((unsigned long) kstack & ~(THREAD_SIZE - 1)) + sizeof(struct thread_info)));
 }
 
 static void print_thread_info(int pid)
@@ -77,12 +73,15 @@ static void print_thread_info(int 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);
+	printk(KERN_INFO "process   : %s, pid   : %d\n", ptask->comm, ptask->pid);
 
     threadinfo = get_thread_info(ptask);
+
     threadunion = get_thread_union(threadinfo);
+
     show_kstack(threadunion);
+
+    printk(KERN_INFO "task stack            : %p\n", ptask->stack);
 }