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annotate src/share/vm/services/g1MemoryPool.hpp @ 3289:b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
Summary: Added counters for jstat
Reviewed-by: tonyp, jwilhelm, stefank, ysr, johnc
| author | jmasa |
|---|---|
| date | Thu, 21 Apr 2011 10:23:44 -0700 |
| parents | f95d63e2154a |
| children | 8229bd737950 |
| rev | line source |
|---|---|
| 1089 | 1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
| 1089 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 1089 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP |
| 26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP | |
| 27 | |
| 28 #ifndef SERIALGC | |
| 29 #include "services/memoryPool.hpp" | |
| 30 #include "services/memoryUsage.hpp" | |
| 31 #endif | |
| 32 | |
| 1089 | 33 class G1CollectedHeap; |
| 34 | |
| 35 // This file contains the three classes that represent the memory | |
| 36 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and | |
| 37 // G1OldGenPool. In G1, unlike our other GCs, we do not have a | |
| 38 // physical space for each of those spaces. Instead, we allocate | |
| 39 // regions for all three spaces out of a single pool of regions (that | |
| 40 // pool basically covers the entire heap). As a result, the eden, | |
| 41 // survivor, and old gen are considered logical spaces in G1, as each | |
| 42 // is a set of non-contiguous regions. This is also reflected in the | |
| 43 // way we map them to memory pools here. The easiest way to have done | |
| 44 // this would have been to map the entire G1 heap to a single memory | |
| 45 // pool. However, it's helpful to show how large the eden and survivor | |
| 46 // get, as this does affect the performance and behavior of G1. Which | |
| 47 // is why we introduce the three memory pools implemented here. | |
| 48 // | |
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49 // See comments in g1MonitoringSupport.hpp for additional details |
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50 // on this model. |
| 1089 | 51 // |
| 52 | |
| 53 | |
| 54 // This class is shared by the three G1 memory pool classes | |
| 55 // (G1EdenPool, G1SurvivorPool, G1OldGenPool). Given that the way we | |
| 56 // calculate used / committed bytes for these three pools is related | |
| 57 // (see comment above), we put the calculations in this class so that | |
| 58 // we can easily share them among the subclasses. | |
| 59 class G1MemoryPoolSuper : public CollectedMemoryPool { | |
| 60 protected: | |
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61 G1CollectedHeap* _g1h; |
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62 |
| 1089 | 63 // Would only be called from subclasses. |
| 64 G1MemoryPoolSuper(G1CollectedHeap* g1h, | |
| 65 const char* name, | |
| 66 size_t init_size, | |
| 67 bool support_usage_threshold); | |
| 68 | |
| 69 // The reason why all the code is in static methods is so that it | |
| 70 // can be safely called from the constructors of the subclasses. | |
| 71 | |
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72 static size_t undefined_max() { |
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73 return (size_t) -1; |
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74 } |
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75 |
| 1089 | 76 static size_t eden_space_committed(G1CollectedHeap* g1h); |
| 77 static size_t eden_space_used(G1CollectedHeap* g1h); | |
| 78 | |
| 79 static size_t survivor_space_committed(G1CollectedHeap* g1h); | |
| 80 static size_t survivor_space_used(G1CollectedHeap* g1h); | |
| 81 | |
| 82 static size_t old_space_committed(G1CollectedHeap* g1h); | |
| 83 static size_t old_space_used(G1CollectedHeap* g1h); | |
| 84 }; | |
| 85 | |
| 86 // Memory pool that represents the G1 eden. | |
| 87 class G1EdenPool : public G1MemoryPoolSuper { | |
| 88 public: | |
| 89 G1EdenPool(G1CollectedHeap* g1h); | |
| 90 | |
| 91 size_t used_in_bytes() { | |
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92 return eden_space_used(_g1h); |
| 1089 | 93 } |
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94 size_t max_size() const { |
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95 return undefined_max(); |
| 1089 | 96 } |
| 97 MemoryUsage get_memory_usage(); | |
| 98 }; | |
| 99 | |
| 100 // Memory pool that represents the G1 survivor. | |
| 101 class G1SurvivorPool : public G1MemoryPoolSuper { | |
| 102 public: | |
| 103 G1SurvivorPool(G1CollectedHeap* g1h); | |
| 104 | |
| 105 size_t used_in_bytes() { | |
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106 return survivor_space_used(_g1h); |
| 1089 | 107 } |
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108 size_t max_size() const { |
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109 return undefined_max(); |
| 1089 | 110 } |
| 111 MemoryUsage get_memory_usage(); | |
| 112 }; | |
| 113 | |
| 114 // Memory pool that represents the G1 old gen. | |
| 115 class G1OldGenPool : public G1MemoryPoolSuper { | |
| 116 public: | |
| 117 G1OldGenPool(G1CollectedHeap* g1h); | |
| 118 | |
| 119 size_t used_in_bytes() { | |
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120 return old_space_used(_g1h); |
| 1089 | 121 } |
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122 size_t max_size() const { |
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123 return undefined_max(); |
| 1089 | 124 } |
| 125 MemoryUsage get_memory_usage(); | |
| 126 }; | |
| 1972 | 127 |
| 128 #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP |