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annotate src/share/vm/services/g1MemoryPool.hpp @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
children
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1 /*
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Gilles Duboscq <duboscq@ssw.jku.at>
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2 * Copyright (c) 2007, 2013, 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_SERVICES_G1MEMORYPOOL_HPP
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26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
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27
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28 #include "utilities/macros.hpp"
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29 #if INCLUDE_ALL_GCS
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30 #include "gc_implementation/g1/g1MonitoringSupport.hpp"
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31 #include "services/memoryPool.hpp"
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32 #include "services/memoryUsage.hpp"
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33 #endif // INCLUDE_ALL_GCS
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34
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35 // This file contains the three classes that represent the memory
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36 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and
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37 // G1OldGenPool. In G1, unlike our other GCs, we do not have a
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38 // physical space for each of those spaces. Instead, we allocate
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39 // regions for all three spaces out of a single pool of regions (that
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40 // pool basically covers the entire heap). As a result, the eden,
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41 // survivor, and old gen are considered logical spaces in G1, as each
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42 // is a set of non-contiguous regions. This is also reflected in the
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43 // way we map them to memory pools here. The easiest way to have done
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44 // this would have been to map the entire G1 heap to a single memory
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45 // pool. However, it's helpful to show how large the eden and survivor
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46 // get, as this does affect the performance and behavior of G1. Which
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47 // is why we introduce the three memory pools implemented here.
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48 //
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49 // See comments in g1MonitoringSupport.hpp for additional details
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50 // on this model.
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51 //
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52
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53 // This class is shared by the three G1 memory pool classes
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54 // (G1EdenPool, G1SurvivorPool, G1OldGenPool).
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55 class G1MemoryPoolSuper : public CollectedMemoryPool {
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56 protected:
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57 const static size_t _undefined_max = (size_t) -1;
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58 G1MonitoringSupport* _g1mm;
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59
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60 // Would only be called from subclasses.
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61 G1MemoryPoolSuper(G1CollectedHeap* g1h,
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62 const char* name,
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63 size_t init_size,
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64 size_t max_size,
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65 bool support_usage_threshold);
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66 };
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67
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68 // Memory pool that represents the G1 eden.
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69 class G1EdenPool : public G1MemoryPoolSuper {
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70 public:
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71 G1EdenPool(G1CollectedHeap* g1h);
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72
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73 size_t used_in_bytes() {
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74 return _g1mm->eden_space_used();
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75 }
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76 size_t max_size() const {
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77 return _undefined_max;
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78 }
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79 MemoryUsage get_memory_usage();
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80 };
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81
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82 // Memory pool that represents the G1 survivor.
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83 class G1SurvivorPool : public G1MemoryPoolSuper {
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84 public:
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85 G1SurvivorPool(G1CollectedHeap* g1h);
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86
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87 size_t used_in_bytes() {
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88 return _g1mm->survivor_space_used();
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89 }
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90 size_t max_size() const {
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91 return _undefined_max;
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92 }
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93 MemoryUsage get_memory_usage();
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94 };
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95
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96 // Memory pool that represents the G1 old gen.
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97 class G1OldGenPool : public G1MemoryPoolSuper {
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98 public:
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99 G1OldGenPool(G1CollectedHeap* g1h);
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100
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101 size_t used_in_bytes() {
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102 return _g1mm->old_space_used();
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103 }
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104 size_t max_size() const {
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105 return _g1mm->old_gen_max();
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106 }
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107 MemoryUsage get_memory_usage();
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108 };
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109
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110 #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP