1 /*
   2  * Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // A GenerationCounter is a holder class for performance counters
  26 // that track a generation
  27 
  28 class GenerationCounters: public CHeapObj {
  29   friend class VMStructs;
  30 
  31  protected:
  32   PerfVariable*      _current_size;
  33   VirtualSpace*      _virtual_space;
  34 
  35   // Constant PerfData types don't need to retain a reference.
  36   // However, it's a good idea to document them here.
  37   // PerfStringConstant*     _name;
  38   // PerfConstant*           _min_size;
  39   // PerfConstant*           _max_size;
  40   // PerfConstant*           _spaces;
  41 
  42   char*              _name_space;
  43 
  44   // This constructor is only meant for use with the PSGenerationCounters
  45   // constructor.  The need for such an constructor should be eliminated
  46   // when VirtualSpace and PSVirtualSpace are unified.
  47   GenerationCounters() : _name_space(NULL), _current_size(NULL), _virtual_space(NULL) {}
  48  public:
  49 
  50   GenerationCounters(const char* name, int ordinal, int spaces,
  51                      VirtualSpace* v);
  52 
  53   ~GenerationCounters() {
  54     if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
  55   }
  56 
  57   virtual void update_all() {
  58     _current_size->set_value(_virtual_space->committed_size());
  59   }
  60 
  61   const char* name_space() const        { return _name_space; }
  62 };