src/share/vm/runtime/arguments.hpp

*** 219,228 ****
--- 219,239 ----
      arg_too_big    = -1,
      arg_in_range   = 0
    };
  
   private:
+   // should ergenomics be applied to the ClassMetaspaceSize?
+   static bool apply_ergonomics_on_classmetaspacesize();
+ 
+   // Value of the ergonomically determined ClassMetaspaceSize
+   // 100,000 classes seems like a good size, so 100M assumes around 1K
+   // per klass.   The vtable and oopMap is embedded so we don't have a fixed
+   // size per klass.   Eventually, this will be parameterized because it
+   // would also be useful to determine the optimal size of the
+   // systemDictionary.
+   // Round up to a power of two to avoid losses due to alignment.
+   static const size_t ErgoClassMetaspaceSize = 128 * M;
  
    // an array containing all flags specified in the .hotspotrc file
    static char** _jvm_flags_array;
    static int    _num_jvm_flags;
    // an array containing all jvm arguments specified in the command line
*** 262,271 ****
--- 273,285 ----
  
    // Option flags
    static bool   _has_profile;
    static bool   _has_alloc_profile;
    static const char*  _gc_log_filename;
+   // computed value for the maximum heap alignment
+   static size_t  _max_heap_alignment;
+ 
    static uintx  _min_heap_size;
  
    // -Xrun arguments
    static AgentLibraryList _libraryList;
    static void add_init_library(const char* name, char* options)
*** 307,316 ****
--- 321,331 ----
    // UseParallel[Old]GC
    static void set_parallel_gc_flags();
    // Garbage-First (UseG1GC)
    static void set_g1_gc_flags();
    // GC ergonomics
+   static void set_max_heap_alignment();
    static void set_use_compressed_oops();
    static void set_ergonomics_flags();
    static void set_shared_spaces_flags();
    // limits the given memory size by the maximum amount of memory this process is
    // currently allowed to allocate or reserve.
*** 424,433 ****
--- 439,452 ----
    // Check stack pages settings
    static bool check_stack_pages();
    // Used by os_solaris
    static bool process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized);
  
+   static size_t max_heap_alignment()       { return _max_heap_alignment; }
+   // return the maximum size a heap with compressed oops can take
+   static size_t max_heap_for_compressed_oops();
+ 
    // return a char* array containing all options
    static char** jvm_flags_array()          { return _jvm_flags_array; }
    static char** jvm_args_array()           { return _jvm_args_array; }
    static int num_jvm_flags()               { return _num_jvm_flags; }
    static int num_jvm_args()                { return _num_jvm_args; }