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 CSpaceCounters is a holder class for performance counters
  26 // that track a space;
  27 
  28 class CSpaceCounters: public CHeapObj {
  29   friend class VMStructs;
  30 
  31  private:
  32   PerfVariable*      _capacity;
  33   PerfVariable*      _used;
  34 
  35   // Constant PerfData types don't need to retain a reference.
  36   // However, it's a good idea to document them here.
  37   // PerfConstant*     _size;
  38 
  39   ContiguousSpace*     _space;
  40   char*                _name_space;
  41 
  42  public:
  43 
  44   CSpaceCounters(const char* name, int ordinal, size_t max_size,
  45                  ContiguousSpace* s, GenerationCounters* gc);
  46 
  47   ~CSpaceCounters() {
  48       if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
  49   }
  50 
  51   inline void update_capacity() {
  52     _capacity->set_value(_space->capacity());
  53   }
  54 
  55   inline void update_used() {
  56     _used->set_value(_space->used());
  57   }
  58 
  59   inline void update_all() {
  60     update_used();
  61     update_capacity();
  62   }
  63 
  64   const char* name_space() const        { return _name_space; }
  65 };
  66 
  67 class ContiguousSpaceUsedHelper : public PerfLongSampleHelper {
  68   private:
  69     ContiguousSpace* _space;
  70 
  71   public:
  72     ContiguousSpaceUsedHelper(ContiguousSpace* space) : _space(space) { }
  73 
  74     inline jlong take_sample() {
  75       return _space->used();
  76     }
  77 };