diff --git a/study/kernel/tools/ftrace_demo/Makefile b/study/debug/trace/ftrace_demo/Makefile
similarity index 100%
rename from study/kernel/tools/ftrace_demo/Makefile
rename to study/debug/trace/ftrace_demo/Makefile
diff --git a/study/debug/trace/ftrace_demo/ftrace_demo.c b/study/debug/trace/ftrace_demo/ftrace_demo.c
new file mode 100644
index 0000000..aefcec5
--- /dev/null
+++ b/study/debug/trace/ftrace_demo/ftrace_demo.c
@@ -0,0 +1,24 @@
+ /*
+ * ftrace_demo.c
+ * http://www.ibm.com/developerworks/cn/linux/l-cn-ftrace3/
+ * http://lxr.free-electrons.com/source/include/trace/events/context_tracking.h 貌似没实现
+ */
+ #include <linux/init.h>
+ #include <linux/module.h>
+ #include <linux/kernel.h>
+
+ MODULE_LICENSE("GPL");
+
+ static int ftrace_demo_init(void)
+ {
+     trace_printk("Can not see this in trace unless loaded for the second time\n");
+     return 0;
+ }
+
+ static void ftrace_demo_exit(void)
+ {
+     trace_printk("Module unloading\n");
+ }
+
+ module_init(ftrace_demo_init);
+ module_exit(ftrace_demo_exit);
diff --git a/study/kernel/tools/ftrace_demo/ftrace_demo.c b/study/kernel/tools/ftrace_demo/ftrace_demo.c
deleted file mode 100644
index 0c34fe5..0000000
--- a/study/kernel/tools/ftrace_demo/ftrace_demo.c
+++ /dev/null
@@ -1,24 +0,0 @@
- /*                                                     
- * ftrace_demo.c 
- * http://www.ibm.com/developerworks/cn/linux/l-cn-ftrace3/
- * http://lxr.free-electrons.com/source/include/trace/events/context_tracking.h 貌似没实现
- */                                                    
- #include <linux/init.h> 
- #include <linux/module.h> 
- #include <linux/kernel.h> 
-
- MODULE_LICENSE("GPL"); 
-
- static int ftrace_demo_init(void) 
- { 
-     trace_printk("Can not see this in trace unless loaded for the second time\n"); 
-     return 0; 
- } 
-
- static void ftrace_demo_exit(void) 
- { 
-     trace_printk("Module unloading\n"); 
- } 
-
- module_init(ftrace_demo_init); 
- module_exit(ftrace_demo_exit);
\ No newline at end of file