Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MonitoringSupport.hpp @ 20211:82693fb204a5
8038930: G1CodeRootSet::test fails with assert(_num_chunks_handed_out == 0) failed: No elements must have been handed out yet
Summary: The test incorrectly assumed that it had been started with no other previous compilation activity. Fix this by allowing multiple code root free chunk lists, and use one separate from the global one to perform the test.
Reviewed-by: brutisso
author | tschatzl |
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date | Wed, 16 Apr 2014 10:14:50 +0200 |
parents | f2110083203d |
children | 63a4eb8bcd23 |
rev | line source |
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3289 | 1 /* |
10405 | 2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
3289 | 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 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP | |
27 | |
28 #include "gc_implementation/shared/hSpaceCounters.hpp" | |
29 | |
30 class G1CollectedHeap; | |
31 | |
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32 // Class for monitoring logical spaces in G1. It provides data for |
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33 // both G1's jstat counters as well as G1's memory pools. |
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34 // |
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35 // G1 splits the heap into heap regions and each heap region belongs |
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36 // to one of the following categories: |
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37 // |
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38 // * eden : regions that have been allocated since the last GC |
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39 // * survivors : regions with objects that survived the last few GCs |
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40 // * old : long-lived non-humongous regions |
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41 // * humongous : humongous regions |
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42 // * free : free regions |
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43 // |
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44 // The combination of eden and survivor regions form the equivalent of |
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45 // the young generation in the other GCs. The combination of old and |
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46 // humongous regions form the equivalent of the old generation in the |
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47 // other GCs. Free regions do not have a good equivalent in the other |
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48 // GCs given that they can be allocated as any of the other region types. |
3289 | 49 // |
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50 // The monitoring tools expect the heap to contain a number of |
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51 // generations (young, old, perm) and each generation to contain a |
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52 // number of spaces (young: eden, survivors, old). Given that G1 does |
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53 // not maintain those spaces physically (e.g., the set of |
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54 // non-contiguous eden regions can be considered as a "logical" |
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55 // space), we'll provide the illusion that those generations and |
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56 // spaces exist. In reality, each generation and space refers to a set |
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57 // of heap regions that are potentially non-contiguous. |
3289 | 58 // |
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59 // This class provides interfaces to access the min, current, and max |
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60 // capacity and current occupancy for each of G1's logical spaces and |
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61 // generations we expose to the monitoring tools. Also provided are |
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62 // counters for G1 concurrent collections and stop-the-world full heap |
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63 // collections. |
3289 | 64 // |
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65 // Below is a description of how the various sizes are calculated. |
3289 | 66 // |
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67 // * Current Capacity |
3289 | 68 // |
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69 // - heap_capacity = current heap capacity (e.g., current committed size) |
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70 // - young_gen_capacity = current max young gen target capacity |
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71 // (i.e., young gen target capacity + max allowed expansion capacity) |
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72 // - survivor_capacity = current survivor region capacity |
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73 // - eden_capacity = young_gen_capacity - survivor_capacity |
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74 // - old_capacity = heap_capacity - young_gen_capacity |
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75 // |
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76 // What we do in the above is to distribute the free regions among |
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77 // eden_capacity and old_capacity. |
3289 | 78 // |
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79 // * Occupancy |
3289 | 80 // |
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81 // - young_gen_used = current young region capacity |
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82 // - survivor_used = survivor_capacity |
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83 // - eden_used = young_gen_used - survivor_used |
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84 // - old_used = overall_used - young_gen_used |
3289 | 85 // |
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86 // Unfortunately, we currently only keep track of the number of |
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87 // currently allocated young and survivor regions + the overall used |
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88 // bytes in the heap, so the above can be a little inaccurate. |
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89 // |
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90 // * Min Capacity |
3289 | 91 // |
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92 // We set this to 0 for all spaces. |
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93 // |
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94 // * Max Capacity |
3289 | 95 // |
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96 // For jstat, we set the max capacity of all spaces to heap_capacity, |
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97 // given that we don't always have a reasonable upper bound on how big |
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98 // each space can grow. For the memory pools, we make the max |
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99 // capacity undefined with the exception of the old memory pool for |
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100 // which we make the max capacity same as the max heap capacity. |
3289 | 101 // |
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102 // If we had more accurate occupancy / capacity information per |
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103 // region set the above calculations would be greatly simplified and |
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104 // be made more accurate. |
3289 | 105 // |
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106 // We update all the above synchronously and we store the results in |
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107 // fields so that we just read said fields when needed. A subtle point |
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108 // is that all the above sizes need to be recalculated when the old |
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109 // gen changes capacity (after a GC or after a humongous allocation) |
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110 // but only the eden occupancy changes when a new eden region is |
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111 // allocated. So, in the latter case we have minimal recalcuation to |
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112 // do which is important as we want to keep the eden region allocation |
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113 // path as low-overhead as possible. |
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6197 | 115 class G1MonitoringSupport : public CHeapObj<mtGC> { |
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116 friend class VMStructs; |
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117 |
3289 | 118 G1CollectedHeap* _g1h; |
119 | |
120 // jstat performance counters | |
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3289 | 122 CollectorCounters* _incremental_collection_counters; |
123 // full stop-the-world collections | |
124 CollectorCounters* _full_collection_counters; | |
125 // young collection set counters. The _eden_counters, | |
126 // _from_counters, and _to_counters are associated with | |
127 // this "generational" counter. | |
128 GenerationCounters* _young_collection_counters; | |
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129 // old collection set counters. The _old_space_counters |
3289 | 130 // below are associated with this "generational" counter. |
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131 GenerationCounters* _old_collection_counters; |
3289 | 132 // Counters for the capacity and used for |
133 // the whole heap | |
134 HSpaceCounters* _old_space_counters; | |
135 // the young collection | |
136 HSpaceCounters* _eden_counters; | |
137 // the survivor collection (only one, _to_counters, is actively used) | |
138 HSpaceCounters* _from_counters; | |
139 HSpaceCounters* _to_counters; | |
140 | |
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141 // When it's appropriate to recalculate the various sizes (at the |
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142 // end of a GC, when a new eden region is allocated, etc.) we store |
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143 // them here so that we can easily report them when needed and not |
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144 // have to recalculate them every time. |
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145 |
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146 size_t _overall_reserved; |
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147 size_t _overall_committed; |
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148 size_t _overall_used; |
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149 |
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150 uint _young_region_num; |
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151 size_t _young_gen_committed; |
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152 size_t _eden_committed; |
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153 size_t _eden_used; |
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154 size_t _survivor_committed; |
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155 size_t _survivor_used; |
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156 |
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157 size_t _old_committed; |
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158 size_t _old_used; |
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159 |
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160 G1CollectedHeap* g1h() { return _g1h; } |
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161 |
3289 | 162 // It returns x - y if x > y, 0 otherwise. |
163 // As described in the comment above, some of the inputs to the | |
164 // calculations we have to do are obtained concurrently and hence | |
165 // may be inconsistent with each other. So, this provides a | |
166 // defensive way of performing the subtraction and avoids the value | |
167 // going negative (which would mean a very large result, given that | |
168 // the parameter are size_t). | |
169 static size_t subtract_up_to_zero(size_t x, size_t y) { | |
170 if (x > y) { | |
171 return x - y; | |
172 } else { | |
173 return 0; | |
174 } | |
175 } | |
176 | |
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177 // Recalculate all the sizes. |
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178 void recalculate_sizes(); |
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179 // Recalculate only what's necessary when a new eden region is allocated. |
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180 void recalculate_eden_size(); |
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181 |
3289 | 182 public: |
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183 G1MonitoringSupport(G1CollectedHeap* g1h); |
3289 | 184 |
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185 // Unfortunately, the jstat tool assumes that no space has 0 |
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186 // capacity. In our case, given that each space is logical, it's |
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187 // possible that no regions will be allocated to it, hence to have 0 |
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188 // capacity (e.g., if there are no survivor regions, the survivor |
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189 // space has 0 capacity). The way we deal with this is to always pad |
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190 // each capacity value we report to jstat by a very small amount to |
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191 // make sure that it's never zero. Given that we sometimes have to |
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192 // report a capacity of a generation that contains several spaces |
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193 // (e.g., young gen includes one eden, two survivor spaces), the |
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194 // mult parameter is provided in order to adding the appropriate |
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195 // padding multiple times so that the capacities add up correctly. |
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196 static size_t pad_capacity(size_t size_bytes, size_t mult = 1) { |
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197 return size_bytes + MinObjAlignmentInBytes * mult; |
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198 } |
3289 | 199 |
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200 // Recalculate all the sizes from scratch and update all the jstat |
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201 // counters accordingly. |
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202 void update_sizes(); |
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203 // Recalculate only what's necessary when a new eden region is |
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204 // allocated and update any jstat counters that need to be updated. |
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205 void update_eden_size(); |
3289 | 206 |
207 CollectorCounters* incremental_collection_counters() { | |
208 return _incremental_collection_counters; | |
209 } | |
210 CollectorCounters* full_collection_counters() { | |
211 return _full_collection_counters; | |
212 } | |
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213 GenerationCounters* young_collection_counters() { |
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214 return _young_collection_counters; |
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215 } |
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216 GenerationCounters* old_collection_counters() { |
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217 return _old_collection_counters; |
3289 | 218 } |
219 HSpaceCounters* old_space_counters() { return _old_space_counters; } | |
220 HSpaceCounters* eden_counters() { return _eden_counters; } | |
221 HSpaceCounters* from_counters() { return _from_counters; } | |
222 HSpaceCounters* to_counters() { return _to_counters; } | |
223 | |
224 // Monitoring support used by | |
225 // MemoryService | |
226 // jstat counters | |
10405 | 227 // Tracing |
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228 |
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229 size_t overall_reserved() { return _overall_reserved; } |
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230 size_t overall_committed() { return _overall_committed; } |
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231 size_t overall_used() { return _overall_used; } |
3289 | 232 |
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233 size_t young_gen_committed() { return _young_gen_committed; } |
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234 size_t young_gen_max() { return overall_reserved(); } |
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235 size_t eden_space_committed() { return _eden_committed; } |
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236 size_t eden_space_used() { return _eden_used; } |
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237 size_t survivor_space_committed() { return _survivor_committed; } |
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238 size_t survivor_space_used() { return _survivor_used; } |
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239 |
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240 size_t old_gen_committed() { return old_space_committed(); } |
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241 size_t old_gen_max() { return overall_reserved(); } |
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242 size_t old_space_committed() { return _old_committed; } |
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243 size_t old_space_used() { return _old_used; } |
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244 }; |
3289 | 245 |
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246 class G1GenerationCounters: public GenerationCounters { |
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247 protected: |
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248 G1MonitoringSupport* _g1mm; |
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249 |
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250 public: |
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251 G1GenerationCounters(G1MonitoringSupport* g1mm, |
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252 const char* name, int ordinal, int spaces, |
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253 size_t min_capacity, size_t max_capacity, |
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254 size_t curr_capacity); |
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255 }; |
3289 | 256 |
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257 class G1YoungGenerationCounters: public G1GenerationCounters { |
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258 public: |
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259 G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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260 virtual void update_all(); |
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261 }; |
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262 |
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263 class G1OldGenerationCounters: public G1GenerationCounters { |
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264 public: |
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265 G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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266 virtual void update_all(); |
3289 | 267 }; |
268 | |
269 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP |