Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MonitoringSupport.hpp @ 8090:2af22eb04623
Merge
author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | d2a62e0f25eb |
children | f2110083203d |
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2 * Copyright (c) 2011, 2012, 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 | |
4710 | 121 // incremental collections both young and mixed |
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 | |
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227 |
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228 size_t overall_reserved() { return _overall_reserved; } |
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229 size_t overall_committed() { return _overall_committed; } |
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230 size_t overall_used() { return _overall_used; } |
3289 | 231 |
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232 size_t young_gen_committed() { return _young_gen_committed; } |
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233 size_t young_gen_max() { return overall_reserved(); } |
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234 size_t eden_space_committed() { return _eden_committed; } |
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235 size_t eden_space_used() { return _eden_used; } |
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236 size_t survivor_space_committed() { return _survivor_committed; } |
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237 size_t survivor_space_used() { return _survivor_used; } |
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238 |
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239 size_t old_gen_committed() { return old_space_committed(); } |
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240 size_t old_gen_max() { return overall_reserved(); } |
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241 size_t old_space_committed() { return _old_committed; } |
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242 size_t old_space_used() { return _old_used; } |
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243 }; |
3289 | 244 |
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245 class G1GenerationCounters: public GenerationCounters { |
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246 protected: |
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247 G1MonitoringSupport* _g1mm; |
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248 |
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249 public: |
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250 G1GenerationCounters(G1MonitoringSupport* g1mm, |
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251 const char* name, int ordinal, int spaces, |
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252 size_t min_capacity, size_t max_capacity, |
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253 size_t curr_capacity); |
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254 }; |
3289 | 255 |
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256 class G1YoungGenerationCounters: public G1GenerationCounters { |
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257 public: |
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258 G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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259 virtual void update_all(); |
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260 }; |
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261 |
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262 class G1OldGenerationCounters: public G1GenerationCounters { |
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263 public: |
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264 G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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265 virtual void update_all(); |
3289 | 266 }; |
267 | |
268 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP |