--- old/src/hotspot/os/bsd/gc/z/zBackingFile_bsd.hpp	2020-01-15 13:47:32.308340182 +0100
+++ new/src/hotspot/os/bsd/gc/z/zBackingFile_bsd.hpp	2020-01-15 13:47:31.967333243 +0100
@@ -47,6 +47,8 @@
 
   bool is_initialized() const;
 
+  void warn_commit_limits(size_t max) const;
+
   size_t size() const;
 
   size_t commit(size_t offset, size_t length);