/*

 * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.

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

 *

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 * 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.

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#ifndef SHARE_GC_G1_HEAPREGIONBOUNDS_HPP

#define SHARE_GC_G1_HEAPREGIONBOUNDS_HPP

#include "memory/allocation.hpp"

class HeapRegionBounds : public AllStatic {

private:

  // Minimum region size; we won't go lower than that.

  // We might want to decrease this in the future, to deal with small

  // heaps a bit more efficiently.

  static const size_t MIN_REGION_SIZE = 1024 * 1024;

  // Maximum region size; we don't go higher than that. There's a good

  // reason for having an upper bound. We don't want regions to get too

  // large, otherwise cleanup's effectiveness would decrease as there

  // will be fewer opportunities to find totally empty regions after

  // marking.

  static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024;

  // The automatic region size calculation will try to have around this

  // many regions in the heap (based on the min heap size).

  static const size_t TARGET_REGION_NUMBER = 2048;

public:

  static inline size_t min_size();

  static inline size_t max_size();

  static inline size_t target_number();

};

#endif // SHARE_GC_G1_HEAPREGIONBOUNDS_HPP