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annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
29 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
30 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" | |
31 #include "gc_implementation/shared/collectorCounters.hpp" | |
32 #include "gc_implementation/shared/markSweep.hpp" | |
33 #include "gc_implementation/shared/mutableSpace.hpp" | |
34 #include "memory/sharedHeap.hpp" | |
35 #include "oops/oop.hpp" | |
36 | |
0 | 37 class ParallelScavengeHeap; |
38 class PSAdaptiveSizePolicy; | |
39 class PSYoungGen; | |
40 class PSOldGen; | |
41 class ParCompactionManager; | |
42 class ParallelTaskTerminator; | |
43 class PSParallelCompact; | |
44 class GCTaskManager; | |
45 class GCTaskQueue; | |
46 class PreGCValues; | |
47 class MoveAndUpdateClosure; | |
48 class RefProcTaskExecutor; | |
49 | |
482
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50 // The SplitInfo class holds the information needed to 'split' a source region |
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51 // so that the live data can be copied to two destination *spaces*. Normally, |
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52 // all the live data in a region is copied to a single destination space (e.g., |
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53 // everything live in a region in eden is copied entirely into the old gen). |
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54 // However, when the heap is nearly full, all the live data in eden may not fit |
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55 // into the old gen. Copying only some of the regions from eden to old gen |
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56 // requires finding a region that does not contain a partial object (i.e., no |
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57 // live object crosses the region boundary) somewhere near the last object that |
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58 // does fit into the old gen. Since it's not always possible to find such a |
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59 // region, splitting is necessary for predictable behavior. |
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60 // |
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61 // A region is always split at the end of the partial object. This avoids |
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62 // additional tests when calculating the new location of a pointer, which is a |
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63 // very hot code path. The partial object and everything to its left will be |
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64 // copied to another space (call it dest_space_1). The live data to the right |
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65 // of the partial object will be copied either within the space itself, or to a |
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66 // different destination space (distinct from dest_space_1). |
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67 // |
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68 // Split points are identified during the summary phase, when region |
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69 // destinations are computed: data about the split, including the |
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70 // partial_object_size, is recorded in a SplitInfo record and the |
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71 // partial_object_size field in the summary data is set to zero. The zeroing is |
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72 // possible (and necessary) since the partial object will move to a different |
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73 // destination space than anything to its right, thus the partial object should |
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74 // not affect the locations of any objects to its right. |
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75 // |
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76 // The recorded data is used during the compaction phase, but only rarely: when |
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77 // the partial object on the split region will be copied across a destination |
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78 // region boundary. This test is made once each time a region is filled, and is |
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79 // a simple address comparison, so the overhead is negligible (see |
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80 // PSParallelCompact::first_src_addr()). |
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81 // |
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82 // Notes: |
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83 // |
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84 // Only regions with partial objects are split; a region without a partial |
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85 // object does not need any extra bookkeeping. |
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86 // |
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87 // At most one region is split per space, so the amount of data required is |
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88 // constant. |
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89 // |
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90 // A region is split only when the destination space would overflow. Once that |
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91 // happens, the destination space is abandoned and no other data (even from |
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92 // other source spaces) is targeted to that destination space. Abandoning the |
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93 // destination space may leave a somewhat large unused area at the end, if a |
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94 // large object caused the overflow. |
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95 // |
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96 // Future work: |
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97 // |
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98 // More bookkeeping would be required to continue to use the destination space. |
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99 // The most general solution would allow data from regions in two different |
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100 // source spaces to be "joined" in a single destination region. At the very |
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101 // least, additional code would be required in next_src_region() to detect the |
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102 // join and skip to an out-of-order source region. If the join region was also |
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103 // the last destination region to which a split region was copied (the most |
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104 // likely case), then additional work would be needed to get fill_region() to |
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105 // stop iteration and switch to a new source region at the right point. Basic |
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106 // idea would be to use a fake value for the top of the source space. It is |
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107 // doable, if a bit tricky. |
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108 // |
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109 // A simpler (but less general) solution would fill the remainder of the |
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110 // destination region with a dummy object and continue filling the next |
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111 // destination region. |
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112 |
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113 class SplitInfo |
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114 { |
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115 public: |
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116 // Return true if this split info is valid (i.e., if a split has been |
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117 // recorded). The very first region cannot have a partial object and thus is |
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118 // never split, so 0 is the 'invalid' value. |
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119 bool is_valid() const { return _src_region_idx > 0; } |
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120 |
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121 // Return true if this split holds data for the specified source region. |
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122 inline bool is_split(size_t source_region) const; |
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123 |
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124 // The index of the split region, the size of the partial object on that |
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125 // region and the destination of the partial object. |
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126 size_t src_region_idx() const { return _src_region_idx; } |
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127 size_t partial_obj_size() const { return _partial_obj_size; } |
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128 HeapWord* destination() const { return _destination; } |
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129 |
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130 // The destination count of the partial object referenced by this split |
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131 // (either 1 or 2). This must be added to the destination count of the |
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132 // remainder of the source region. |
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133 unsigned int destination_count() const { return _destination_count; } |
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134 |
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135 // If a word within the partial object will be written to the first word of a |
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136 // destination region, this is the address of the destination region; |
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137 // otherwise this is NULL. |
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138 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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139 |
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140 // If a word within the partial object will be written to the first word of a |
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141 // destination region, this is the address of that word within the partial |
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142 // object; otherwise this is NULL. |
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143 HeapWord* first_src_addr() const { return _first_src_addr; } |
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144 |
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145 // Record the data necessary to split the region src_region_idx. |
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146 void record(size_t src_region_idx, size_t partial_obj_size, |
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147 HeapWord* destination); |
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148 |
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149 void clear(); |
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150 |
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151 DEBUG_ONLY(void verify_clear();) |
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152 |
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153 private: |
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154 size_t _src_region_idx; |
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155 size_t _partial_obj_size; |
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156 HeapWord* _destination; |
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157 unsigned int _destination_count; |
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158 HeapWord* _dest_region_addr; |
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159 HeapWord* _first_src_addr; |
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160 }; |
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161 |
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162 inline bool SplitInfo::is_split(size_t region_idx) const |
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163 { |
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164 return _src_region_idx == region_idx && is_valid(); |
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165 } |
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166 |
0 | 167 class SpaceInfo |
168 { | |
169 public: | |
170 MutableSpace* space() const { return _space; } | |
171 | |
172 // Where the free space will start after the collection. Valid only after the | |
173 // summary phase completes. | |
174 HeapWord* new_top() const { return _new_top; } | |
175 | |
176 // Allows new_top to be set. | |
177 HeapWord** new_top_addr() { return &_new_top; } | |
178 | |
179 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
180 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
181 | |
182 // Where the dense prefix ends, or the compacted region begins. | |
183 HeapWord* dense_prefix() const { return _dense_prefix; } | |
184 | |
185 // The start array for the (generation containing the) space, or NULL if there | |
186 // is no start array. | |
187 ObjectStartArray* start_array() const { return _start_array; } | |
188 | |
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189 SplitInfo& split_info() { return _split_info; } |
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190 |
0 | 191 void set_space(MutableSpace* s) { _space = s; } |
192 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
193 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
194 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
195 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
196 | |
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197 void publish_new_top() const { _space->set_top(_new_top); } |
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198 |
0 | 199 private: |
200 MutableSpace* _space; | |
201 HeapWord* _new_top; | |
202 HeapWord* _min_dense_prefix; | |
203 HeapWord* _dense_prefix; | |
204 ObjectStartArray* _start_array; | |
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205 SplitInfo _split_info; |
0 | 206 }; |
207 | |
208 class ParallelCompactData | |
209 { | |
210 public: | |
211 // Sizes are in HeapWords, unless indicated otherwise. | |
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212 static const size_t Log2RegionSize; |
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213 static const size_t RegionSize; |
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214 static const size_t RegionSizeBytes; |
0 | 215 |
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216 // Mask for the bits in a size_t to get an offset within a region. |
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217 static const size_t RegionSizeOffsetMask; |
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218 // Mask for the bits in a pointer to get an offset within a region. |
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219 static const size_t RegionAddrOffsetMask; |
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220 // Mask for the bits in a pointer to get the address of the start of a region. |
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221 static const size_t RegionAddrMask; |
0 | 222 |
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223 class RegionData |
0 | 224 { |
225 public: | |
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226 // Destination address of the region. |
0 | 227 HeapWord* destination() const { return _destination; } |
228 | |
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229 // The first region containing data destined for this region. |
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230 size_t source_region() const { return _source_region; } |
0 | 231 |
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232 // The object (if any) starting in this region and ending in a different |
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233 // region that could not be updated during the main (parallel) compaction |
0 | 234 // phase. This is different from _partial_obj_addr, which is an object that |
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235 // extends onto a source region. However, the two uses do not overlap in |
0 | 236 // time, so the same field is used to save space. |
237 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
238 | |
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239 // The starting address of the partial object extending onto the region. |
0 | 240 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
241 | |
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242 // Size of the partial object extending onto the region (words). |
0 | 243 size_t partial_obj_size() const { return _partial_obj_size; } |
244 | |
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245 // Size of live data that lies within this region due to objects that start |
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246 // in this region (words). This does not include the partial object |
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247 // extending onto the region (if any), or the part of an object that extends |
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248 // onto the next region (if any). |
0 | 249 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
250 | |
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251 // Total live data that lies within the region (words). |
0 | 252 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
253 | |
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254 // The destination_count is the number of other regions to which data from |
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255 // this region will be copied. At the end of the summary phase, the valid |
0 | 256 // values of destination_count are |
257 // | |
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258 // 0 - data from the region will be compacted completely into itself, or the |
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259 // region is empty. The region can be claimed and then filled. |
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260 // 1 - data from the region will be compacted into 1 other region; some |
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261 // data from the region may also be compacted into the region itself. |
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262 // 2 - data from the region will be copied to 2 other regions. |
0 | 263 // |
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264 // During compaction as regions are emptied, the destination_count is |
0 | 265 // decremented (atomically) and when it reaches 0, it can be claimed and |
266 // then filled. | |
267 // | |
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268 // A region is claimed for processing by atomically changing the |
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269 // destination_count to the claimed value (dc_claimed). After a region has |
0 | 270 // been filled, the destination_count should be set to the completed value |
271 // (dc_completed). | |
272 inline uint destination_count() const; | |
273 inline uint destination_count_raw() const; | |
274 | |
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275 // The location of the java heap data that corresponds to this region. |
0 | 276 inline HeapWord* data_location() const; |
277 | |
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278 // The highest address referenced by objects in this region. |
0 | 279 inline HeapWord* highest_ref() const; |
280 | |
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281 // Whether this region is available to be claimed, has been claimed, or has |
0 | 282 // been completed. |
283 // | |
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284 // Minor subtlety: claimed() returns true if the region is marked |
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285 // completed(), which is desirable since a region must be claimed before it |
0 | 286 // can be completed. |
287 bool available() const { return _dc_and_los < dc_one; } | |
288 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
289 bool completed() const { return _dc_and_los >= dc_completed; } | |
290 | |
291 // These are not atomic. | |
292 void set_destination(HeapWord* addr) { _destination = addr; } | |
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293 void set_source_region(size_t region) { _source_region = region; } |
0 | 294 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
295 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
296 void set_partial_obj_size(size_t words) { | |
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297 _partial_obj_size = (region_sz_t) words; |
0 | 298 } |
299 | |
300 inline void set_destination_count(uint count); | |
301 inline void set_live_obj_size(size_t words); | |
302 inline void set_data_location(HeapWord* addr); | |
303 inline void set_completed(); | |
304 inline bool claim_unsafe(); | |
305 | |
306 // These are atomic. | |
307 inline void add_live_obj(size_t words); | |
308 inline void set_highest_ref(HeapWord* addr); | |
309 inline void decrement_destination_count(); | |
310 inline bool claim(); | |
311 | |
312 private: | |
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313 // The type used to represent object sizes within a region. |
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314 typedef uint region_sz_t; |
0 | 315 |
316 // Constants for manipulating the _dc_and_los field, which holds both the | |
317 // destination count and live obj size. The live obj size lives at the | |
318 // least significant end so no masking is necessary when adding. | |
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319 static const region_sz_t dc_shift; // Shift amount. |
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320 static const region_sz_t dc_mask; // Mask for destination count. |
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321 static const region_sz_t dc_one; // 1, shifted appropriately. |
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322 static const region_sz_t dc_claimed; // Region has been claimed. |
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323 static const region_sz_t dc_completed; // Region has been completed. |
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324 static const region_sz_t los_mask; // Mask for live obj size. |
0 | 325 |
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326 HeapWord* _destination; |
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327 size_t _source_region; |
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328 HeapWord* _partial_obj_addr; |
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329 region_sz_t _partial_obj_size; |
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330 region_sz_t volatile _dc_and_los; |
0 | 331 #ifdef ASSERT |
332 // These enable optimizations that are only partially implemented. Use | |
333 // debug builds to prevent the code fragments from breaking. | |
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334 HeapWord* _data_location; |
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335 HeapWord* _highest_ref; |
0 | 336 #endif // #ifdef ASSERT |
337 | |
338 #ifdef ASSERT | |
339 public: | |
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340 uint _pushed; // 0 until region is pushed onto a worker's stack |
0 | 341 private: |
342 #endif | |
343 }; | |
344 | |
345 public: | |
346 ParallelCompactData(); | |
347 bool initialize(MemRegion covered_region); | |
348 | |
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349 size_t region_count() const { return _region_count; } |
0 | 350 |
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351 // Convert region indices to/from RegionData pointers. |
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352 inline RegionData* region(size_t region_idx) const; |
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353 inline size_t region(const RegionData* const region_ptr) const; |
0 | 354 |
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355 // Returns true if the given address is contained within the region |
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356 bool region_contains(size_t region_index, HeapWord* addr); |
0 | 357 |
358 void add_obj(HeapWord* addr, size_t len); | |
359 void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } | |
360 | |
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361 // Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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362 // destination of region n is simply the start of region n. The argument beg |
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363 // must be region-aligned; end need not be. |
0 | 364 void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
365 | |
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366 HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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367 HeapWord* destination, HeapWord* target_end, |
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368 HeapWord** target_next); |
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369 bool summarize(SplitInfo& split_info, |
0 | 370 HeapWord* source_beg, HeapWord* source_end, |
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371 HeapWord** source_next, |
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372 HeapWord* target_beg, HeapWord* target_end, |
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373 HeapWord** target_next); |
0 | 374 |
375 void clear(); | |
375
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376 void clear_range(size_t beg_region, size_t end_region); |
0 | 377 void clear_range(HeapWord* beg, HeapWord* end) { |
375
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378 clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
0 | 379 } |
380 | |
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381 // Return the number of words between addr and the start of the region |
0 | 382 // containing addr. |
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383 inline size_t region_offset(const HeapWord* addr) const; |
0 | 384 |
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385 // Convert addresses to/from a region index or region pointer. |
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386 inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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387 inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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388 inline HeapWord* region_to_addr(size_t region) const; |
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389 inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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390 inline HeapWord* region_to_addr(const RegionData* region) const; |
0 | 391 |
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392 inline HeapWord* region_align_down(HeapWord* addr) const; |
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393 inline HeapWord* region_align_up(HeapWord* addr) const; |
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394 inline bool is_region_aligned(HeapWord* addr) const; |
0 | 395 |
396 // Return the address one past the end of the partial object. | |
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397 HeapWord* partial_obj_end(size_t region_idx) const; |
0 | 398 |
399 // Return the new location of the object p after the | |
400 // the compaction. | |
401 HeapWord* calc_new_pointer(HeapWord* addr); | |
402 | |
403 HeapWord* calc_new_pointer(oop p) { | |
404 return calc_new_pointer((HeapWord*) p); | |
405 } | |
406 | |
407 #ifdef ASSERT | |
408 void verify_clear(const PSVirtualSpace* vspace); | |
409 void verify_clear(); | |
410 #endif // #ifdef ASSERT | |
411 | |
412 private: | |
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413 bool initialize_region_data(size_t region_size); |
0 | 414 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
415 | |
416 private: | |
417 HeapWord* _region_start; | |
418 #ifdef ASSERT | |
419 HeapWord* _region_end; | |
420 #endif // #ifdef ASSERT | |
421 | |
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422 PSVirtualSpace* _region_vspace; |
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423 RegionData* _region_data; |
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424 size_t _region_count; |
0 | 425 }; |
426 | |
427 inline uint | |
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428 ParallelCompactData::RegionData::destination_count_raw() const |
0 | 429 { |
430 return _dc_and_los & dc_mask; | |
431 } | |
432 | |
433 inline uint | |
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434 ParallelCompactData::RegionData::destination_count() const |
0 | 435 { |
436 return destination_count_raw() >> dc_shift; | |
437 } | |
438 | |
439 inline void | |
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440 ParallelCompactData::RegionData::set_destination_count(uint count) |
0 | 441 { |
442 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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443 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
0 | 444 _dc_and_los = (count << dc_shift) | live_sz; |
445 } | |
446 | |
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447 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
0 | 448 { |
449 assert(words <= los_mask, "would overflow"); | |
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450 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
0 | 451 } |
452 | |
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453 inline void ParallelCompactData::RegionData::decrement_destination_count() |
0 | 454 { |
455 assert(_dc_and_los < dc_claimed, "already claimed"); | |
456 assert(_dc_and_los >= dc_one, "count would go negative"); | |
457 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
458 } | |
459 | |
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460 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
0 | 461 { |
462 DEBUG_ONLY(return _data_location;) | |
463 NOT_DEBUG(return NULL;) | |
464 } | |
465 | |
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466 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
0 | 467 { |
468 DEBUG_ONLY(return _highest_ref;) | |
469 NOT_DEBUG(return NULL;) | |
470 } | |
471 | |
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472 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
0 | 473 { |
474 DEBUG_ONLY(_data_location = addr;) | |
475 } | |
476 | |
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477 inline void ParallelCompactData::RegionData::set_completed() |
0 | 478 { |
479 assert(claimed(), "must be claimed first"); | |
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480 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
0 | 481 } |
482 | |
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483 // MT-unsafe claiming of a region. Should only be used during single threaded |
0 | 484 // execution. |
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485 inline bool ParallelCompactData::RegionData::claim_unsafe() |
0 | 486 { |
487 if (available()) { | |
488 _dc_and_los |= dc_claimed; | |
489 return true; | |
490 } | |
491 return false; | |
492 } | |
493 | |
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494 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
0 | 495 { |
496 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
497 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
498 } | |
499 | |
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500 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
0 | 501 { |
502 #ifdef ASSERT | |
503 HeapWord* tmp = _highest_ref; | |
504 while (addr > tmp) { | |
505 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
506 } | |
507 #endif // #ifdef ASSERT | |
508 } | |
509 | |
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510 inline bool ParallelCompactData::RegionData::claim() |
0 | 511 { |
512 const int los = (int) live_obj_size(); | |
513 const int old = Atomic::cmpxchg(dc_claimed | los, | |
514 (volatile int*) &_dc_and_los, los); | |
515 return old == los; | |
516 } | |
517 | |
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518 inline ParallelCompactData::RegionData* |
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519 ParallelCompactData::region(size_t region_idx) const |
0 | 520 { |
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521 assert(region_idx <= region_count(), "bad arg"); |
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522 return _region_data + region_idx; |
0 | 523 } |
524 | |
525 inline size_t | |
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526 ParallelCompactData::region(const RegionData* const region_ptr) const |
0 | 527 { |
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528 assert(region_ptr >= _region_data, "bad arg"); |
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529 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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530 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
0 | 531 } |
532 | |
533 inline size_t | |
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534 ParallelCompactData::region_offset(const HeapWord* addr) const |
0 | 535 { |
536 assert(addr >= _region_start, "bad addr"); | |
537 assert(addr <= _region_end, "bad addr"); | |
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538 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
0 | 539 } |
540 | |
541 inline size_t | |
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542 ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
0 | 543 { |
544 assert(addr >= _region_start, "bad addr"); | |
545 assert(addr <= _region_end, "bad addr"); | |
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546 return pointer_delta(addr, _region_start) >> Log2RegionSize; |
0 | 547 } |
548 | |
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549 inline ParallelCompactData::RegionData* |
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550 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
0 | 551 { |
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552 return region(addr_to_region_idx(addr)); |
0 | 553 } |
554 | |
555 inline HeapWord* | |
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556 ParallelCompactData::region_to_addr(size_t region) const |
0 | 557 { |
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558 assert(region <= _region_count, "region out of range"); |
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559 return _region_start + (region << Log2RegionSize); |
0 | 560 } |
561 | |
562 inline HeapWord* | |
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563 ParallelCompactData::region_to_addr(const RegionData* region) const |
0 | 564 { |
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565 return region_to_addr(pointer_delta(region, _region_data, |
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566 sizeof(RegionData))); |
0 | 567 } |
568 | |
569 inline HeapWord* | |
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570 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
0 | 571 { |
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572 assert(region <= _region_count, "region out of range"); |
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573 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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574 return region_to_addr(region) + offset; |
0 | 575 } |
576 | |
577 inline HeapWord* | |
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578 ParallelCompactData::region_align_down(HeapWord* addr) const |
0 | 579 { |
580 assert(addr >= _region_start, "bad addr"); | |
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581 assert(addr < _region_end + RegionSize, "bad addr"); |
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582 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
0 | 583 } |
584 | |
585 inline HeapWord* | |
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586 ParallelCompactData::region_align_up(HeapWord* addr) const |
0 | 587 { |
588 assert(addr >= _region_start, "bad addr"); | |
589 assert(addr <= _region_end, "bad addr"); | |
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590 return region_align_down(addr + RegionSizeOffsetMask); |
0 | 591 } |
592 | |
593 inline bool | |
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594 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
0 | 595 { |
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596 return region_offset(addr) == 0; |
0 | 597 } |
598 | |
599 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the | |
600 // do_addr() method. | |
601 // | |
602 // The closure is initialized with the number of heap words to process | |
603 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
604 // methods in subclasses should update the total as words are processed. Since | |
605 // only one subclass actually uses this mechanism to terminate iteration, the | |
606 // default initial value is > 0. The implementation is here and not in the | |
607 // single subclass that uses it to avoid making is_full() virtual, and thus | |
608 // adding a virtual call per live object. | |
609 | |
610 class ParMarkBitMapClosure: public StackObj { | |
611 public: | |
612 typedef ParMarkBitMap::idx_t idx_t; | |
613 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
614 | |
615 public: | |
616 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
617 size_t words = max_uintx); | |
618 | |
619 inline ParCompactionManager* compaction_manager() const; | |
620 inline ParMarkBitMap* bitmap() const; | |
621 inline size_t words_remaining() const; | |
622 inline bool is_full() const; | |
623 inline HeapWord* source() const; | |
624 | |
625 inline void set_source(HeapWord* addr); | |
626 | |
627 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
628 | |
629 protected: | |
630 inline void decrement_words_remaining(size_t words); | |
631 | |
632 private: | |
633 ParMarkBitMap* const _bitmap; | |
634 ParCompactionManager* const _compaction_manager; | |
635 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
636 size_t _words_remaining; // Words left to copy. | |
637 | |
638 protected: | |
639 HeapWord* _source; // Next addr that would be read. | |
640 }; | |
641 | |
642 inline | |
643 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
644 ParCompactionManager* cm, | |
645 size_t words): | |
646 _bitmap(bitmap), _compaction_manager(cm) | |
647 #ifdef ASSERT | |
648 , _initial_words_remaining(words) | |
649 #endif | |
650 { | |
651 _words_remaining = words; | |
652 _source = NULL; | |
653 } | |
654 | |
655 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
656 return _compaction_manager; | |
657 } | |
658 | |
659 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
660 return _bitmap; | |
661 } | |
662 | |
663 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
664 return _words_remaining; | |
665 } | |
666 | |
667 inline bool ParMarkBitMapClosure::is_full() const { | |
668 return words_remaining() == 0; | |
669 } | |
670 | |
671 inline HeapWord* ParMarkBitMapClosure::source() const { | |
672 return _source; | |
673 } | |
674 | |
675 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
676 _source = addr; | |
677 } | |
678 | |
679 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
680 assert(_words_remaining >= words, "processed too many words"); | |
681 _words_remaining -= words; | |
682 } | |
683 | |
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684 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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685 // does parts of the collection using parallel threads. The collection includes |
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686 // the tenured generation and the young generation. The permanent generation is |
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687 // collected at the same time as the other two generations but the permanent |
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688 // generation is collect by a single GC thread. The permanent generation is |
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689 // collected serially because of the requirement that during the processing of a |
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690 // klass AAA, any objects reference by AAA must already have been processed. |
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691 // This requirement is enforced by a left (lower address) to right (higher |
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692 // address) sliding compaction. |
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693 // |
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694 // There are four phases of the collection. |
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695 // |
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696 // - marking phase |
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697 // - summary phase |
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698 // - compacting phase |
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699 // - clean up phase |
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700 // |
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701 // Roughly speaking these phases correspond, respectively, to |
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702 // - mark all the live objects |
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703 // - calculate the destination of each object at the end of the collection |
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704 // - move the objects to their destination |
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705 // - update some references and reinitialize some variables |
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706 // |
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707 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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708 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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709 // complete marking of the heap. The summary phase is implemented in |
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710 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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711 // in PSParallelCompact::compact(). |
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712 // |
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713 // A space that is being collected is divided into regions and with each region |
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714 // is associated an object of type ParallelCompactData. Each region is of a |
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715 // fixed size and typically will contain more than 1 object and may have parts |
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716 // of objects at the front and back of the region. |
263
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717 // |
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718 // region -----+---------------------+---------- |
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719 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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720 // |
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721 // The marking phase does a complete marking of all live objects in the heap. |
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722 // The marking also compiles the size of the data for all live objects covered |
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723 // by the region. This size includes the part of any live object spanning onto |
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724 // the region (part of AAA if it is live) from the front, all live objects |
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725 // contained in the region (BBB and/or CCC if they are live), and the part of |
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726 // any live objects covered by the region that extends off the region (part of |
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727 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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728 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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729 // done atomically as is the accumulation of the size of the live objects |
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730 // covered by a region. |
263
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731 // |
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732 // The summary phase calculates the total live data to the left of each region |
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733 // XXX. Based on that total and the bottom of the space, it can calculate the |
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734 // starting location of the live data in XXX. The summary phase calculates for |
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735 // each region XXX quantites such as |
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736 // |
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737 // - the amount of live data at the beginning of a region from an object |
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738 // entering the region. |
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739 // - the location of the first live data on the region |
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740 // - a count of the number of regions receiving live data from XXX. |
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741 // |
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742 // See ParallelCompactData for precise details. The summary phase also |
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743 // calculates the dense prefix for the compaction. The dense prefix is a |
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744 // portion at the beginning of the space that is not moved. The objects in the |
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745 // dense prefix do need to have their object references updated. See method |
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746 // summarize_dense_prefix(). |
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747 // |
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748 // The summary phase is done using 1 GC thread. |
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749 // |
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750 // The compaction phase moves objects to their new location and updates all |
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751 // references in the object. |
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752 // |
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753 // A current exception is that objects that cross a region boundary are moved |
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754 // but do not have their references updated. References are not updated because |
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755 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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756 // has been updated. KKK likely resides in a region to the left of the region |
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757 // containing AAA. These AAA's have there references updated at the end in a |
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758 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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759 // An alternate strategy is being investigated for this deferral of updating. |
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760 // |
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761 // Compaction is done on a region basis. A region that is ready to be filled is |
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762 // put on a ready list and GC threads take region off the list and fill them. A |
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763 // region is ready to be filled if it empty of live objects. Such a region may |
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764 // have been initially empty (only contained dead objects) or may have had all |
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765 // its live objects copied out already. A region that compacts into itself is |
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766 // also ready for filling. The ready list is initially filled with empty |
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767 // regions and regions compacting into themselves. There is always at least 1 |
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768 // region that can be put on the ready list. The regions are atomically added |
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769 // and removed from the ready list. |
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770 |
0 | 771 class PSParallelCompact : AllStatic { |
772 public: | |
773 // Convenient access to type names. | |
774 typedef ParMarkBitMap::idx_t idx_t; | |
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775 typedef ParallelCompactData::RegionData RegionData; |
0 | 776 |
777 typedef enum { | |
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778 old_space_id, eden_space_id, |
0 | 779 from_space_id, to_space_id, last_space_id |
780 } SpaceId; | |
781 | |
782 public: | |
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783 // Inline closure decls |
0 | 784 // |
785 class IsAliveClosure: public BoolObjectClosure { | |
786 public: | |
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787 virtual void do_object(oop p); |
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788 virtual bool do_object_b(oop p); |
0 | 789 }; |
790 | |
791 class KeepAliveClosure: public OopClosure { | |
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792 private: |
0 | 793 ParCompactionManager* _compaction_manager; |
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794 protected: |
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795 template <class T> inline void do_oop_work(T* p); |
0 | 796 public: |
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797 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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798 virtual void do_oop(oop* p); |
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799 virtual void do_oop(narrowOop* p); |
0 | 800 }; |
801 | |
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802 // Current unused |
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803 class FollowRootClosure: public OopsInGenClosure { |
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804 private: |
0 | 805 ParCompactionManager* _compaction_manager; |
806 public: | |
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807 FollowRootClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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808 virtual void do_oop(oop* p); |
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809 virtual void do_oop(narrowOop* p); |
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810 }; |
0 | 811 |
812 class FollowStackClosure: public VoidClosure { | |
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813 private: |
0 | 814 ParCompactionManager* _compaction_manager; |
815 public: | |
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816 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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817 virtual void do_void(); |
0 | 818 }; |
819 | |
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820 class AdjustPointerClosure: public OopClosure { |
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821 private: |
0 | 822 bool _is_root; |
823 public: | |
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824 AdjustPointerClosure(bool is_root) : _is_root(is_root) { } |
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825 virtual void do_oop(oop* p); |
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826 virtual void do_oop(narrowOop* p); |
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827 // do not walk from thread stacks to the code cache on this phase |
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828 virtual void do_code_blob(CodeBlob* cb) const { } |
0 | 829 }; |
830 | |
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831 class AdjustKlassClosure : public KlassClosure { |
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832 public: |
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833 void do_klass(Klass* klass); |
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834 }; |
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835 |
0 | 836 friend class KeepAliveClosure; |
837 friend class FollowStackClosure; | |
838 friend class AdjustPointerClosure; | |
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839 friend class AdjustKlassClosure; |
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840 friend class FollowKlassClosure; |
0 | 841 friend class FollowRootClosure; |
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842 friend class InstanceClassLoaderKlass; |
0 | 843 friend class RefProcTaskProxy; |
844 | |
845 private: | |
846 static elapsedTimer _accumulated_time; | |
847 static unsigned int _total_invocations; | |
848 static unsigned int _maximum_compaction_gc_num; | |
849 static jlong _time_of_last_gc; // ms | |
850 static CollectorCounters* _counters; | |
851 static ParMarkBitMap _mark_bitmap; | |
852 static ParallelCompactData _summary_data; | |
853 static IsAliveClosure _is_alive_closure; | |
854 static SpaceInfo _space_info[last_space_id]; | |
855 static bool _print_phases; | |
856 static AdjustPointerClosure _adjust_root_pointer_closure; | |
857 static AdjustPointerClosure _adjust_pointer_closure; | |
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858 static AdjustKlassClosure _adjust_klass_closure; |
0 | 859 |
860 // Reference processing (used in ...follow_contents) | |
861 static ReferenceProcessor* _ref_processor; | |
862 | |
863 // Updated location of intArrayKlassObj. | |
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864 static Klass* _updated_int_array_klass_obj; |
0 | 865 |
866 // Values computed at initialization and used by dead_wood_limiter(). | |
867 static double _dwl_mean; | |
868 static double _dwl_std_dev; | |
869 static double _dwl_first_term; | |
870 static double _dwl_adjustment; | |
871 #ifdef ASSERT | |
872 static bool _dwl_initialized; | |
873 #endif // #ifdef ASSERT | |
874 | |
875 private: | |
876 | |
877 static void initialize_space_info(); | |
878 | |
879 // Return true if details about individual phases should be printed. | |
880 static inline bool print_phases(); | |
881 | |
882 // Clear the marking bitmap and summary data that cover the specified space. | |
883 static void clear_data_covering_space(SpaceId id); | |
884 | |
885 static void pre_compact(PreGCValues* pre_gc_values); | |
886 static void post_compact(); | |
887 | |
888 // Mark live objects | |
889 static void marking_phase(ParCompactionManager* cm, | |
890 bool maximum_heap_compaction); | |
891 | |
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892 template <class T> static inline void adjust_pointer(T* p, bool is_root); |
0 | 893 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
894 | |
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895 template <class T> |
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896 static inline void follow_root(ParCompactionManager* cm, T* p); |
0 | 897 |
898 // Compute the dense prefix for the designated space. This is an experimental | |
899 // implementation currently not used in production. | |
900 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
901 bool maximum_compaction); | |
902 | |
903 // Methods used to compute the dense prefix. | |
904 | |
905 // Compute the value of the normal distribution at x = density. The mean and | |
906 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
907 static inline double normal_distribution(double density); | |
908 | |
909 // Initialize the static vars used by dead_wood_limiter(). | |
910 static void initialize_dead_wood_limiter(); | |
911 | |
912 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
913 // not reclaimed). | |
914 static double dead_wood_limiter(double density, size_t min_percent); | |
915 | |
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916 // Find the first (left-most) region in the range [beg, end) that has at least |
0 | 917 // dead_words of dead space to the left. The argument beg must be the first |
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918 // region in the space that is not completely live. |
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919 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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920 const RegionData* end, |
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921 size_t dead_words); |
0 | 922 |
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923 // Return a pointer to the first region in the range [beg, end) that is not |
0 | 924 // completely full. |
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925 static RegionData* first_dead_space_region(const RegionData* beg, |
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926 const RegionData* end); |
0 | 927 |
928 // Return a value indicating the benefit or 'yield' if the compacted region | |
929 // were to start (or equivalently if the dense prefix were to end) at the | |
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930 // candidate region. Higher values are better. |
0 | 931 // |
932 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
933 // updating references in the dense prefix plus (b) copying objects and | |
934 // updating references in the compacted region. | |
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935 static inline double reclaimed_ratio(const RegionData* const candidate, |
0 | 936 HeapWord* const bottom, |
937 HeapWord* const top, | |
938 HeapWord* const new_top); | |
939 | |
940 // Compute the dense prefix for the designated space. | |
941 static HeapWord* compute_dense_prefix(const SpaceId id, | |
942 bool maximum_compaction); | |
943 | |
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944 // Return true if dead space crosses onto the specified Region; bit must be |
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945 // the bit index corresponding to the first word of the Region. |
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946 static inline bool dead_space_crosses_boundary(const RegionData* region, |
0 | 947 idx_t bit); |
948 | |
949 // Summary phase utility routine to fill dead space (if any) at the dense | |
950 // prefix boundary. Should only be called if the the dense prefix is | |
951 // non-empty. | |
952 static void fill_dense_prefix_end(SpaceId id); | |
953 | |
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954 // Clear the summary data source_region field for the specified addresses. |
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955 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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956 |
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957 #ifndef PRODUCT |
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958 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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959 |
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960 // Fill the region [start, start + words) with live object(s). Only usable |
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961 // for the old and permanent generations. |
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962 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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963 size_t words); |
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964 // Include the new objects in the summary data. |
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965 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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966 |
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967 // Add live objects to a survivor space since it's rare that both survivors |
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968 // are non-empty. |
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969 static void provoke_split_fill_survivor(SpaceId id); |
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970 |
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971 // Add live objects and/or choose the dense prefix to provoke splitting. |
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972 static void provoke_split(bool & maximum_compaction); |
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973 #endif |
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974 |
0 | 975 static void summarize_spaces_quick(); |
976 static void summarize_space(SpaceId id, bool maximum_compaction); | |
977 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
978 | |
979 // Adjust addresses in roots. Does not adjust addresses in heap. | |
980 static void adjust_roots(); | |
981 | |
982 // Move objects to new locations. | |
983 static void compact_perm(ParCompactionManager* cm); | |
984 static void compact(); | |
985 | |
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986 // Add available regions to the stack and draining tasks to the task queue. |
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987 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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988 uint parallel_gc_threads); |
0 | 989 |
990 // Add dense prefix update tasks to the task queue. | |
991 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
992 uint parallel_gc_threads); | |
993 | |
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994 // Add region stealing tasks to the task queue. |
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995 static void enqueue_region_stealing_tasks( |
0 | 996 GCTaskQueue* q, |
997 ParallelTaskTerminator* terminator_ptr, | |
998 uint parallel_gc_threads); | |
999 | |
1000 // If objects are left in eden after a collection, try to move the boundary | |
1001 // and absorb them into the old gen. Returns true if eden was emptied. | |
1002 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
1003 PSYoungGen* young_gen, | |
1004 PSOldGen* old_gen); | |
1005 | |
1006 // Reset time since last full gc | |
1007 static void reset_millis_since_last_gc(); | |
1008 | |
1009 public: | |
1010 class MarkAndPushClosure: public OopClosure { | |
113
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1011 private: |
0 | 1012 ParCompactionManager* _compaction_manager; |
1013 public: | |
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1014 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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1015 virtual void do_oop(oop* p); |
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1016 virtual void do_oop(narrowOop* p); |
0 | 1017 }; |
1018 | |
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1019 // The one and only place to start following the classes. |
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1020 // Should only be applied to the ClassLoaderData klasses list. |
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1021 class FollowKlassClosure : public KlassClosure { |
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1022 private: |
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1023 MarkAndPushClosure* _mark_and_push_closure; |
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1024 public: |
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1025 FollowKlassClosure(MarkAndPushClosure* mark_and_push_closure) : |
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1026 _mark_and_push_closure(mark_and_push_closure) { } |
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1027 void do_klass(Klass* klass); |
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1028 }; |
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1029 |
0 | 1030 PSParallelCompact(); |
1031 | |
1032 // Convenient accessor for Universe::heap(). | |
1033 static ParallelScavengeHeap* gc_heap() { | |
1034 return (ParallelScavengeHeap*)Universe::heap(); | |
1035 } | |
1036 | |
1037 static void invoke(bool maximum_heap_compaction); | |
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1038 static bool invoke_no_policy(bool maximum_heap_compaction); |
0 | 1039 |
1040 static void post_initialize(); | |
1041 // Perform initialization for PSParallelCompact that requires | |
1042 // allocations. This should be called during the VM initialization | |
1043 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
1044 // in the event of a failure. | |
1045 static bool initialize(); | |
1046 | |
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1047 // Closure accessors |
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1048 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
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1049 static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&_adjust_root_pointer_closure; } |
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1050 static KlassClosure* adjust_klass_closure() { return (KlassClosure*)&_adjust_klass_closure; } |
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1051 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
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1052 |
0 | 1053 // Public accessors |
1054 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
1055 static unsigned int total_invocations() { return _total_invocations; } | |
1056 static CollectorCounters* counters() { return _counters; } | |
1057 | |
1058 // Used to add tasks | |
1059 static GCTaskManager* const gc_task_manager(); | |
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1060 static Klass* updated_int_array_klass_obj() { |
0 | 1061 return _updated_int_array_klass_obj; |
1062 } | |
1063 | |
1064 // Marking support | |
1065 static inline bool mark_obj(oop obj); | |
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1066 static inline bool is_marked(oop obj); |
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1067 // Check mark and maybe push on marking stack |
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1068 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1069 T* p); |
0 | 1070 |
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1071 static void follow_klass(ParCompactionManager* cm, Klass* klass); |
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1072 static void adjust_klass(ParCompactionManager* cm, Klass* klass); |
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1073 |
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1074 static void follow_class_loader(ParCompactionManager* cm, |
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1075 ClassLoaderData* klass); |
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1076 static void adjust_class_loader(ParCompactionManager* cm, |
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1077 ClassLoaderData* klass); |
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1078 |
0 | 1079 // Compaction support. |
1080 // Return true if p is in the range [beg_addr, end_addr). | |
1081 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1082 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1083 | |
1084 // Convenience wrappers for per-space data kept in _space_info. | |
1085 static inline MutableSpace* space(SpaceId space_id); | |
1086 static inline HeapWord* new_top(SpaceId space_id); | |
1087 static inline HeapWord* dense_prefix(SpaceId space_id); | |
1088 static inline ObjectStartArray* start_array(SpaceId space_id); | |
1089 | |
1090 // Move and update the live objects in the specified space. | |
1091 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
1092 | |
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1093 // Process the end of the given region range in the dense prefix. |
0 | 1094 // This includes saving any object not updated. |
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1095 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1096 size_t region_start_index, |
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1097 size_t region_end_index, |
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1098 idx_t exiting_object_offset, |
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1099 idx_t region_offset_start, |
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1100 idx_t region_offset_end); |
0 | 1101 |
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1102 // Update a region in the dense prefix. For each live object |
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1103 // in the region, update it's interior references. For each |
0 | 1104 // dead object, fill it with deadwood. Dead space at the end |
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1105 // of a region range will be filled to the start of the next |
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1106 // live object regardless of the region_index_end. None of the |
0 | 1107 // objects in the dense prefix move and dead space is dead |
1108 // (holds only dead objects that don't need any processing), so | |
1109 // dead space can be filled in any order. | |
1110 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
1111 SpaceId space_id, | |
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1112 size_t region_index_start, |
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1113 size_t region_index_end); |
0 | 1114 |
1115 // Return the address of the count + 1st live word in the range [beg, end). | |
1116 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
1117 | |
1118 // Return the address of the word to be copied to dest_addr, which must be | |
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1119 // aligned to a region boundary. |
0 | 1120 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
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1121 SpaceId src_space_id, |
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1122 size_t src_region_idx); |
0 | 1123 |
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1124 // Determine the next source region, set closure.source() to the start of the |
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1125 // new region return the region index. Parameter end_addr is the address one |
0 | 1126 // beyond the end of source range just processed. If necessary, switch to a |
1127 // new source space and set src_space_id (in-out parameter) and src_space_top | |
1128 // (out parameter) accordingly. | |
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1129 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1130 SpaceId& src_space_id, |
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1131 HeapWord*& src_space_top, |
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1132 HeapWord* end_addr); |
0 | 1133 |
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1134 // Decrement the destination count for each non-empty source region in the |
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1135 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1136 // count for a region goes to 0 and it needs to be filled, enqueue it. |
0 | 1137 static void decrement_destination_counts(ParCompactionManager* cm, |
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1138 SpaceId src_space_id, |
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1139 size_t beg_region, |
0 | 1140 HeapWord* end_addr); |
1141 | |
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1142 // Fill a region, copying objects from one or more source regions. |
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1143 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1144 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1145 fill_region(cm, region); |
0 | 1146 } |
1147 | |
1148 // Update the deferred objects in the space. | |
1149 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
1150 | |
1151 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
1152 static ParallelCompactData& summary_data() { return _summary_data; } | |
1153 | |
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1154 static inline void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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1155 static inline void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
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1156 |
0 | 1157 // Reference Processing |
1158 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
1159 | |
1160 // Return the SpaceId for the given address. | |
1161 static SpaceId space_id(HeapWord* addr); | |
1162 | |
1163 // Time since last full gc (in milliseconds). | |
1164 static jlong millis_since_last_gc(); | |
1165 | |
1166 #ifndef PRODUCT | |
1167 // Debugging support. | |
1168 static const char* space_names[last_space_id]; | |
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1169 static void print_region_ranges(); |
0 | 1170 static void print_dense_prefix_stats(const char* const algorithm, |
1171 const SpaceId id, | |
1172 const bool maximum_compaction, | |
1173 HeapWord* const addr); | |
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1174 static void summary_phase_msg(SpaceId dst_space_id, |
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1175 HeapWord* dst_beg, HeapWord* dst_end, |
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1176 SpaceId src_space_id, |
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1177 HeapWord* src_beg, HeapWord* src_end); |
0 | 1178 #endif // #ifndef PRODUCT |
1179 | |
1180 #ifdef ASSERT | |
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1181 // Sanity check the new location of a word in the heap. |
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1182 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1183 // Verify that all the regions have been emptied. |
0 | 1184 static void verify_complete(SpaceId space_id); |
1185 #endif // #ifdef ASSERT | |
1186 }; | |
1187 | |
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1188 inline bool PSParallelCompact::mark_obj(oop obj) { |
0 | 1189 const int obj_size = obj->size(); |
1190 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
1191 _summary_data.add_obj(obj, obj_size); | |
1192 return true; | |
1193 } else { | |
1194 return false; | |
1195 } | |
1196 } | |
1197 | |
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1198 inline bool PSParallelCompact::is_marked(oop obj) { |
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1199 return mark_bitmap()->is_marked(obj); |
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1200 } |
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1201 |
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1202 template <class T> |
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1203 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1204 assert(!Universe::heap()->is_in_reserved(p), |
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1205 "roots shouldn't be things within the heap"); |
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1206 |
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1207 T heap_oop = oopDesc::load_heap_oop(p); |
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1208 if (!oopDesc::is_null(heap_oop)) { |
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1209 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1210 if (mark_bitmap()->is_unmarked(obj)) { |
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1211 if (mark_obj(obj)) { |
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1212 obj->follow_contents(cm); |
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1213 } |
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1214 } |
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1215 } |
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1216 cm->follow_marking_stacks(); |
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1217 } |
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1218 |
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1219 template <class T> |
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1220 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1221 T heap_oop = oopDesc::load_heap_oop(p); |
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1222 if (!oopDesc::is_null(heap_oop)) { |
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1223 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
1638 | 1224 if (mark_bitmap()->is_unmarked(obj) && mark_obj(obj)) { |
1225 cm->push(obj); | |
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1226 } |
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1227 } |
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1228 } |
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1229 |
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1230 template <class T> |
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1231 inline void PSParallelCompact::adjust_pointer(T* p, bool isroot) { |
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1232 T heap_oop = oopDesc::load_heap_oop(p); |
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1233 if (!oopDesc::is_null(heap_oop)) { |
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1234 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1235 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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1236 assert(new_obj != NULL, // is forwarding ptr? |
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1237 "should be forwarded"); |
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1238 // Just always do the update unconditionally? |
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1239 if (new_obj != NULL) { |
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1240 assert(Universe::heap()->is_in_reserved(new_obj), |
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1241 "should be in object space"); |
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1242 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1243 } |
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1244 } |
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1245 } |
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1246 |
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1247 template <class T> |
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1248 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1249 mark_and_push(_compaction_manager, p); |
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1250 } |
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1251 |
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1252 inline bool PSParallelCompact::print_phases() { |
0 | 1253 return _print_phases; |
1254 } | |
1255 | |
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1256 inline double PSParallelCompact::normal_distribution(double density) { |
0 | 1257 assert(_dwl_initialized, "uninitialized"); |
1258 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
1259 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
1260 } | |
1261 | |
1262 inline bool | |
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1263 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
0 | 1264 idx_t bit) |
1265 { | |
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1266 assert(bit > 0, "cannot call this for the first bit/region"); |
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1267 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
0 | 1268 "sanity check"); |
1269 | |
1270 // Dead space crosses the boundary if (1) a partial object does not extend | |
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1271 // onto the region, (2) an object does not start at the beginning of the |
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1272 // region, and (3) an object does not end at the end of the prior region. |
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1273 return region->partial_obj_size() == 0 && |
0 | 1274 !_mark_bitmap.is_obj_beg(bit) && |
1275 !_mark_bitmap.is_obj_end(bit - 1); | |
1276 } | |
1277 | |
1278 inline bool | |
1279 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1280 return p >= beg_addr && p < end_addr; | |
1281 } | |
1282 | |
1283 inline bool | |
1284 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1285 return is_in((HeapWord*)p, beg_addr, end_addr); | |
1286 } | |
1287 | |
1288 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
1289 assert(id < last_space_id, "id out of range"); | |
1290 return _space_info[id].space(); | |
1291 } | |
1292 | |
1293 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
1294 assert(id < last_space_id, "id out of range"); | |
1295 return _space_info[id].new_top(); | |
1296 } | |
1297 | |
1298 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
1299 assert(id < last_space_id, "id out of range"); | |
1300 return _space_info[id].dense_prefix(); | |
1301 } | |
1302 | |
1303 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
1304 assert(id < last_space_id, "id out of range"); | |
1305 return _space_info[id].start_array(); | |
1306 } | |
1307 | |
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1308 #ifdef ASSERT |
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1309 inline void |
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1310 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1311 { |
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1312 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1313 "must move left or to a different space"); |
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1314 assert(is_object_aligned((intptr_t)old_addr) && is_object_aligned((intptr_t)new_addr), |
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1315 "checking alignment"); |
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1316 } |
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1317 #endif // ASSERT |
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1318 |
0 | 1319 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
1320 public: | |
1321 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
1322 ObjectStartArray* start_array, | |
1323 HeapWord* destination, size_t words); | |
1324 | |
1325 // Accessors. | |
1326 HeapWord* destination() const { return _destination; } | |
1327 | |
1328 // If the object will fit (size <= words_remaining()), copy it to the current | |
1329 // destination, update the interior oops and the start array and return either | |
1330 // full (if the closure is full) or incomplete. If the object will not fit, | |
1331 // return would_overflow. | |
1332 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
1333 | |
1334 // Copy enough words to fill this closure, starting at source(). Interior | |
1335 // oops and the start array are not updated. Return full. | |
1336 IterationStatus copy_until_full(); | |
1337 | |
1338 // Copy enough words to fill this closure or to the end of an object, | |
1339 // whichever is smaller, starting at source(). Interior oops and the start | |
1340 // array are not updated. | |
1341 void copy_partial_obj(); | |
1342 | |
1343 protected: | |
1344 // Update variables to indicate that word_count words were processed. | |
1345 inline void update_state(size_t word_count); | |
1346 | |
1347 protected: | |
1348 ObjectStartArray* const _start_array; | |
1349 HeapWord* _destination; // Next addr to be written. | |
1350 }; | |
1351 | |
1352 inline | |
1353 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
1354 ParCompactionManager* cm, | |
1355 ObjectStartArray* start_array, | |
1356 HeapWord* destination, | |
1357 size_t words) : | |
1358 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
1359 { | |
1360 _destination = destination; | |
1361 } | |
1362 | |
1363 inline void MoveAndUpdateClosure::update_state(size_t words) | |
1364 { | |
1365 decrement_words_remaining(words); | |
1366 _source += words; | |
1367 _destination += words; | |
1368 } | |
1369 | |
1370 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
1371 private: | |
1372 const PSParallelCompact::SpaceId _space_id; | |
1373 ObjectStartArray* const _start_array; | |
1374 | |
1375 public: | |
1376 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
1377 ParCompactionManager* cm, | |
1378 PSParallelCompact::SpaceId space_id); | |
1379 | |
1380 // Update the object. | |
1381 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
1382 | |
1383 inline void do_addr(HeapWord* addr); | |
1384 }; | |
1385 | |
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1386 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1387 { |
0 | 1388 _start_array->allocate_block(addr); |
1389 oop(addr)->update_contents(compaction_manager()); | |
1390 } | |
1391 | |
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1392 class FillClosure: public ParMarkBitMapClosure |
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1393 { |
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1394 public: |
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1395 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
0 | 1396 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
481
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1397 _start_array(PSParallelCompact::start_array(space_id)) |
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1398 { |
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1399 assert(space_id == PSParallelCompact::old_space_id, |
0 | 1400 "cannot use FillClosure in the young gen"); |
1401 } | |
1402 | |
1403 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
481
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1404 CollectedHeap::fill_with_objects(addr, size); |
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1405 HeapWord* const end = addr + size; |
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1406 do { |
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1407 _start_array->allocate_block(addr); |
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1408 addr += oop(addr)->size(); |
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1409 } while (addr < end); |
0 | 1410 return ParMarkBitMap::incomplete; |
1411 } | |
1412 | |
1413 private: | |
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1414 ObjectStartArray* const _start_array; |
0 | 1415 }; |
1972 | 1416 |
1417 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |