diff --git a/tests/cpu/index.md b/tests/cpu/index.md
index d7a1699..5f8d988 100644
--- a/tests/cpu/index.md
+++ b/tests/cpu/index.md
@@ -1,4 +1,5 @@
 - [likely 和 unlikely 汇编结果对比](tests/cpu/test01)
 - [物理机 cpu 系统利用率的计算过程](tests/cpu/test06)
 - [容器 cpu 系统利用率的计算过程](tests/cpu/test07)
-- [直接使用perf_event_open获取硬件计数](tests/cpu/test08)
\ No newline at end of file
+- [直接使用perf_event_open获取硬件计数](tests/cpu/test08)
+- [火焰图专用测试代码](tests/cpu/test09)
\ No newline at end of file
diff --git a/tests/cpu/test08/main.c b/tests/cpu/test08/main.c
index 8e57e94..b604831 100644
--- a/tests/cpu/test08/main.c
+++ b/tests/cpu/test08/main.c
@@ -6,9 +6,9 @@
 #include <linux/perf_event.h>
  
 // 封装perf_event_open系统调用
-int perf_event_open(struct perf_event_attr *attr,pid_t pid,int  ,int group_fd,unsigned long flags)
+int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags)
 {
-    return syscall(__NR_perf_event_open,attr,pid,cpu,group_fd,flags);
+    return syscall(__NR_perf_event_open, attr,pid, cpu, group_fd, flags);
 }
  
 int main()
diff --git a/tests/cpu/test09/main.c b/tests/cpu/test09/main.c
new file mode 100644
index 0000000..23b9c57
--- /dev/null
+++ b/tests/cpu/test09/main.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+void caculate(){
+    for (i = 0; i < 10000000; i++) {
+    }
+}
+
+void funcE(){
+    caculate();
+}
+
+void funcD(){
+    funcE();
+}
+
+void funcA(){
+    funcD();
+}
+
+void funcB(){
+    caculate();
+}
+
+void funcC(){
+    caculate();
+}
+
+int main() {
+    int i;
+    for (i = 0; i < 100; i++) {
+        if (i < 10) {
+            funcA();
+        } else if (i < 16) {
+            funcB();
+        } else {
+            funcC();
+        }
+    }
+
+    return 0;
+}