src/share/vm/code/nmethod.hpp

*** 200,214 ****
    // event processing needs to be done.
    jint  _lock_count;
  
    // not_entrant method removal. Each mark_sweep pass will update
    // this mark to current sweep invocation count if it is seen on the
!   // stack.  An not_entrant method can be removed when there is no
    // more activations, i.e., when the _stack_traversal_mark is less than
    // current sweep traversal index.
    long _stack_traversal_mark;
  
    ExceptionCache *_exception_cache;
    PcDescCache     _pc_desc_cache;
  
    // These are used for compiled synchronized native methods to
    // locate the owner and stack slot for the BasicLock so that we can
--- 200,221 ----
    // event processing needs to be done.
    jint  _lock_count;
  
    // not_entrant method removal. Each mark_sweep pass will update
    // this mark to current sweep invocation count if it is seen on the
!   // stack.  An not_entrant method can be removed when there are no
    // more activations, i.e., when the _stack_traversal_mark is less than
    // current sweep traversal index.
    long _stack_traversal_mark;
  
+   // The _hotness_counter indicates the hotness of a method. The higher
+   // the value the hotter the method. The hotness counter of a nmethod is
+   // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
+   // is active while stack scanning (mark_active_nmethods()). The hotness
+   // counter is decreased (by 1) while sweeping.
+   int _hotness_counter;
+ 
    ExceptionCache *_exception_cache;
    PcDescCache     _pc_desc_cache;
  
    // These are used for compiled synchronized native methods to
    // locate the owner and stack slot for the BasicLock so that we can
*** 380,389 ****
--- 387,401 ----
    int handler_table_size() const                  { return            handler_table_end() -            handler_table_begin(); }
    int nul_chk_table_size() const                  { return            nul_chk_table_end() -            nul_chk_table_begin(); }
  
    int total_size        () const;
  
+   // Hotness counter accessor methods
+   void dec_hotness_counter(int val) { _hotness_counter-= val;  }
+   void set_hotness_counter(int val) { _hotness_counter = val;  }
+   int  get_hotness_counter() const  { return _hotness_counter; }
+ 
    // Containment
    bool consts_contains       (address addr) const { return consts_begin       () <= addr && addr < consts_end       (); }
    bool insts_contains        (address addr) const { return insts_begin        () <= addr && addr < insts_end        (); }
    bool stub_contains         (address addr) const { return stub_begin         () <= addr && addr < stub_end         (); }
    bool oops_contains         (oop*    addr) const { return oops_begin         () <= addr && addr < oops_end         (); }