src/share/vm/memory/filemap.hpp

@@ -250,15 +250,26 @@
   // Return true if given address is in the mapped shared space.
   bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
   bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
   void print_shared_spaces() NOT_CDS_RETURN;
 
-  static size_t shared_spaces_size() {
-    return align_size_up(SharedReadOnlySize + SharedReadWriteSize +
-                         SharedMiscDataSize + SharedMiscCodeSize,
+  // The ro+rw+md+mc spaces size
+  static size_t core_spaces_size() {
+    return align_size_up((SharedReadOnlySize + SharedReadWriteSize +
+                          SharedMiscDataSize + SharedMiscCodeSize),
                          os::vm_allocation_granularity());
   }
+  // The estimated optional space size. Only the portion containning data is 
+  // written out to the archive and mapped at runtime. There is no memory waste
+  // due to unused portion in optional space.
+  static size_t optional_space_size() {
+    return core_spaces_size(); 
+  }
+  // Total shared_spaces size includes the ro, rw, md, mc and od spaces
+  static size_t shared_spaces_size() {
+    return core_spaces_size() + optional_space_size();
+  }
 
   // Stop CDS sharing and unmap CDS regions.
   static void stop_sharing_and_unmap(const char* msg);
 
   static void allocate_classpath_entry_table();