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1 /* |
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2 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_GC_G1_HEAPREGIONBOUNDS_HPP |
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26 #define SHARE_VM_GC_G1_HEAPREGIONBOUNDS_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 |
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30 class HeapRegionBounds : public AllStatic { |
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31 private: |
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32 // Minimum region size; we won't go lower than that. |
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33 // We might want to decrease this in the future, to deal with small |
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34 // heaps a bit more efficiently. |
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35 static const size_t MIN_REGION_SIZE = 1024 * 1024; |
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36 |
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37 // Maximum region size; we don't go higher than that. There's a good |
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38 // reason for having an upper bound. We don't want regions to get too |
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39 // large, otherwise cleanup's effectiveness would decrease as there |
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40 // will be fewer opportunities to find totally empty regions after |
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41 // marking. |
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42 static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024; |
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43 |
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44 // The automatic region size calculation will try to have around this |
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45 // many regions in the heap (based on the min heap size). |
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46 static const size_t TARGET_REGION_NUMBER = 2048; |
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47 |
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48 public: |
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49 static inline size_t min_size(); |
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50 static inline size_t max_size(); |
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51 static inline size_t target_number(); |
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52 }; |
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53 |
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54 #endif // SHARE_VM_GC_G1_HEAPREGIONBOUNDS_HPP |