/*

 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#ifndef SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP

#define SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP

#include "gc/z/zArray.hpp"

#include "memory/allocation.hpp"

class ZPage;

class ZRelocationSet;

class ZRelocationSetSelectorGroup {

private:

  const char* const _name;

  const size_t      _page_size;

  const size_t      _object_size_limit;

  const size_t      _fragmentation_limit;

  ZArray<ZPage*>    _registered_pages;

  ZPage**           _sorted_pages;

  size_t            _nselected;

  size_t            _relocating;

  size_t            _fragmentation;

  void semi_sort();

public:

  ZRelocationSetSelectorGroup(const char* name,

                              size_t page_size,

                              size_t object_size_limit);

  ~ZRelocationSetSelectorGroup();

  void register_live_page(ZPage* page, size_t garbage);

  void select();

  ZPage* const* selected() const;

  size_t nselected() const;

  size_t relocating() const;

  size_t fragmentation() const;

};

class ZRelocationSetSelector : public StackObj {

private:

  ZRelocationSetSelectorGroup _small;

  ZRelocationSetSelectorGroup _medium;

  size_t                      _live;

  size_t                      _garbage;

  size_t                      _fragmentation;

public:

  ZRelocationSetSelector();

  void register_live_page(ZPage* page);

  void register_garbage_page(ZPage* page);

  void select(ZRelocationSet* relocation_set);

  size_t live() const;

  size_t garbage() const;

  size_t relocating() const;

  size_t fragmentation() const;

};

#endif // SHARE_GC_Z_ZRELOCATIONSETSELECTOR_HPP