diff --git a/common/tool_cmd.py b/common/tool_cmd.py
index 4bbd2022245e745e757f8885812a8a175632ef00..835bce794d614264e0d93e373f2f9feda1133f3b 100644
--- a/common/tool_cmd.py
+++ b/common/tool_cmd.py
@@ -34,6 +34,14 @@ class ToolCmd:
             raise argparse.ArgumentTypeError("should set to -1 or existed process id")
         return val
 
+    def __check_offcpu_pid(self, val):
+        try:
+            ival = int(val)
+        except ValueError:
+            raise argparse.ArgumentTypeError("must be an integer")
+
+        return ival
+
     def args_help(self):
         #共享可选参数wpath ipath opath
         parent_parser = argparse.ArgumentParser(add_help=False)