--- old/src/hotspot/os/linux/os_linux.hpp	2019-10-31 15:27:46.841657823 +0100
+++ new/src/hotspot/os/linux/os_linux.hpp	2019-10-31 15:27:46.527657358 +0100
@@ -32,6 +32,7 @@
 
 class Linux {
   friend class os;
+  friend class CgroupSubsystem;
   friend class OSContainer;
   friend class TestReserveMemorySpecial;