| /* |
| * Copyright (c) 2014, 2015, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_G1_HEAPREGIONBOUNDS_HPP |
| #define SHARE_VM_GC_G1_HEAPREGIONBOUNDS_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_VM_GC_G1_HEAPREGIONBOUNDS_HPP |