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20423
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1 /*
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2 * Copyright (c) 2014, 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_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
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27
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28 class HeapRegionBounds : public AllStatic {
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29 private:
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30 // Minimum region size; we won't go lower than that.
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31 // We might want to decrease this in the future, to deal with small
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32 // heaps a bit more efficiently.
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33 static const size_t MIN_REGION_SIZE = 1024 * 1024;
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34
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35 // Maximum region size; we don't go higher than that. There's a good
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36 // reason for having an upper bound. We don't want regions to get too
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37 // large, otherwise cleanup's effectiveness would decrease as there
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38 // will be fewer opportunities to find totally empty regions after
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39 // marking.
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40 static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024;
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41
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42 // The automatic region size calculation will try to have around this
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43 // many regions in the heap (based on the min heap size).
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44 static const size_t TARGET_REGION_NUMBER = 2048;
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45
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46 public:
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47 static inline size_t min_size();
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48 static inline size_t max_size();
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49 static inline size_t target_number();
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50 };
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51
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52 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
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