1 /*
   2  * Copyright (c) 2017, 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 ZRelocationSetSelectorGroup {
  34 private:
  35   const char* const    _name;
  36   const size_t         _page_size;
  37   const size_t         _object_size_limit;
  38   const size_t         _fragmentation_limit;
  39 
  40   ZArray<const ZPage*> _registered_pages;
  41   const ZPage**        _sorted_pages;
  42   size_t               _nselected;
  43   size_t               _relocating;
  44   size_t               _fragmentation;
  45 
  46   void semi_sort();
  47 
  48 public:
  49   ZRelocationSetSelectorGroup(const char* name,
  50                               size_t page_size,
  51                               size_t object_size_limit);
  52   ~ZRelocationSetSelectorGroup();
  53 
  54   void register_live_page(const ZPage* page, size_t garbage);
  55   void select();
  56 
  57   const ZPage* const* selected() const;
  58   size_t nselected() const;
  59   size_t relocating() const;
  60   size_t fragmentation() const;
  61 };
  62 
  63 class ZRelocationSetSelector : public StackObj {
  64 private:
  65   ZRelocationSetSelectorGroup _small;
  66   ZRelocationSetSelectorGroup _medium;
  67   size_t                      _live;
  68   size_t                      _garbage;
  69   size_t                      _fragmentation;
  70 
  71 public:
  72   ZRelocationSetSelector();
  73 
  74   void register_live_page(const ZPage* page);
  75   void register_garbage_page(const ZPage* page);
  76   void select(ZRelocationSet* relocation_set);
  77 
  78   size_t live() const;
  79   size_t garbage() const;
  80   size_t relocating() const;
  81   size_t fragmentation() const;
  82 };
  83 
  84 #endif // SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP