1 /*
   2  * Copyright (c) 2017, 2020, 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 #ifndef SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP
  25 #define SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP
  26 
  27 #include "gc/z/zArray.hpp"
  28 #include "memory/allocation.hpp"
  29 
  30 class ZPage;
  31 class ZRelocationSet;
  32 
  33 class ZRelocationSetSelectorGroupStats {
  34   friend class ZRelocationSetSelectorGroup;
  35 
  36 private:
  37   size_t _npages;
  38   size_t _total;
  39   size_t _live;
  40   size_t _garbage;
  41   size_t _empty;
  42   size_t _compacting_from;
  43   size_t _compacting_to;
  44 
  45 public:
  46   ZRelocationSetSelectorGroupStats();
  47 
  48   size_t npages() const;
  49   size_t total() const;
  50   size_t live() const;
  51   size_t garbage() const;
  52   size_t empty() const;
  53   size_t compacting_from() const;
  54   size_t compacting_to() const;
  55 };
  56 
  57 class ZRelocationSetSelectorStats {
  58   friend class ZRelocationSetSelector;
  59 
  60 private:
  61   ZRelocationSetSelectorGroupStats _small;
  62   ZRelocationSetSelectorGroupStats _medium;
  63   ZRelocationSetSelectorGroupStats _large;
  64 
  65 public:
  66   const ZRelocationSetSelectorGroupStats& small() const;
  67   const ZRelocationSetSelectorGroupStats& medium() const;
  68   const ZRelocationSetSelectorGroupStats& large() const;
  69 };
  70 
  71 class ZRelocationSetSelectorGroup {
  72 private:
  73   const char* const                _name;
  74   const size_t                     _page_size;
  75   const size_t                     _object_size_limit;
  76   const size_t                     _fragmentation_limit;
  77 
  78   ZArray<ZPage*>                   _registered_pages;
  79   ZPage**                          _sorted_pages;
  80   size_t                           _nselected;
  81   ZRelocationSetSelectorGroupStats _stats;
  82 
  83   void semi_sort();
  84 
  85 public:
  86   ZRelocationSetSelectorGroup(const char* name,
  87                               size_t page_size,
  88                               size_t object_size_limit);
  89   ~ZRelocationSetSelectorGroup();
  90 
  91   void register_live_page(ZPage* page);
  92   void register_garbage_page(ZPage* page);
  93   void select();
  94 
  95   ZPage* const* selected() const;
  96   size_t nselected() const;
  97 
  98   const ZRelocationSetSelectorGroupStats& stats() const;
  99 };
 100 
 101 class ZRelocationSetSelector : public StackObj {
 102 private:
 103   ZRelocationSetSelectorGroup _small;
 104   ZRelocationSetSelectorGroup _medium;
 105   ZRelocationSetSelectorGroup _large;
 106 
 107 public:
 108   ZRelocationSetSelector();
 109 
 110   void register_live_page(ZPage* page);
 111   void register_garbage_page(ZPage* page);
 112   void select(ZRelocationSet* relocation_set);
 113 
 114   ZRelocationSetSelectorStats stats() const;
 115 };
 116 
 117 #endif // SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP