Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 1286:ab75c83d7c37
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author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | 54b3b351d6f9 |
children | 2a1472c30599 |
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0 | 1 /* |
579 | 2 * Copyright 2005-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class ParallelScavengeHeap; | |
26 class PSAdaptiveSizePolicy; | |
27 class PSYoungGen; | |
28 class PSOldGen; | |
29 class PSPermGen; | |
30 class ParCompactionManager; | |
31 class ParallelTaskTerminator; | |
32 class PSParallelCompact; | |
33 class GCTaskManager; | |
34 class GCTaskQueue; | |
35 class PreGCValues; | |
36 class MoveAndUpdateClosure; | |
37 class RefProcTaskExecutor; | |
38 | |
482
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39 // The SplitInfo class holds the information needed to 'split' a source region |
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40 // so that the live data can be copied to two destination *spaces*. Normally, |
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41 // all the live data in a region is copied to a single destination space (e.g., |
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42 // everything live in a region in eden is copied entirely into the old gen). |
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43 // However, when the heap is nearly full, all the live data in eden may not fit |
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44 // into the old gen. Copying only some of the regions from eden to old gen |
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45 // requires finding a region that does not contain a partial object (i.e., no |
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46 // live object crosses the region boundary) somewhere near the last object that |
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47 // does fit into the old gen. Since it's not always possible to find such a |
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48 // region, splitting is necessary for predictable behavior. |
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49 // |
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50 // A region is always split at the end of the partial object. This avoids |
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51 // additional tests when calculating the new location of a pointer, which is a |
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52 // very hot code path. The partial object and everything to its left will be |
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53 // copied to another space (call it dest_space_1). The live data to the right |
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54 // of the partial object will be copied either within the space itself, or to a |
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55 // different destination space (distinct from dest_space_1). |
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56 // |
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57 // Split points are identified during the summary phase, when region |
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58 // destinations are computed: data about the split, including the |
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59 // partial_object_size, is recorded in a SplitInfo record and the |
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60 // partial_object_size field in the summary data is set to zero. The zeroing is |
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61 // possible (and necessary) since the partial object will move to a different |
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62 // destination space than anything to its right, thus the partial object should |
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63 // not affect the locations of any objects to its right. |
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64 // |
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65 // The recorded data is used during the compaction phase, but only rarely: when |
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66 // the partial object on the split region will be copied across a destination |
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67 // region boundary. This test is made once each time a region is filled, and is |
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68 // a simple address comparison, so the overhead is negligible (see |
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69 // PSParallelCompact::first_src_addr()). |
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70 // |
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71 // Notes: |
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72 // |
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73 // Only regions with partial objects are split; a region without a partial |
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74 // object does not need any extra bookkeeping. |
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75 // |
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76 // At most one region is split per space, so the amount of data required is |
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77 // constant. |
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78 // |
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79 // A region is split only when the destination space would overflow. Once that |
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80 // happens, the destination space is abandoned and no other data (even from |
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81 // other source spaces) is targeted to that destination space. Abandoning the |
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82 // destination space may leave a somewhat large unused area at the end, if a |
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83 // large object caused the overflow. |
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84 // |
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85 // Future work: |
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86 // |
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87 // More bookkeeping would be required to continue to use the destination space. |
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88 // The most general solution would allow data from regions in two different |
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89 // source spaces to be "joined" in a single destination region. At the very |
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90 // least, additional code would be required in next_src_region() to detect the |
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91 // join and skip to an out-of-order source region. If the join region was also |
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92 // the last destination region to which a split region was copied (the most |
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93 // likely case), then additional work would be needed to get fill_region() to |
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94 // stop iteration and switch to a new source region at the right point. Basic |
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95 // idea would be to use a fake value for the top of the source space. It is |
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96 // doable, if a bit tricky. |
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97 // |
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98 // A simpler (but less general) solution would fill the remainder of the |
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99 // destination region with a dummy object and continue filling the next |
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100 // destination region. |
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101 |
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102 class SplitInfo |
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103 { |
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104 public: |
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105 // Return true if this split info is valid (i.e., if a split has been |
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106 // recorded). The very first region cannot have a partial object and thus is |
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107 // never split, so 0 is the 'invalid' value. |
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108 bool is_valid() const { return _src_region_idx > 0; } |
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109 |
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110 // Return true if this split holds data for the specified source region. |
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111 inline bool is_split(size_t source_region) const; |
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112 |
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113 // The index of the split region, the size of the partial object on that |
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114 // region and the destination of the partial object. |
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115 size_t src_region_idx() const { return _src_region_idx; } |
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116 size_t partial_obj_size() const { return _partial_obj_size; } |
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117 HeapWord* destination() const { return _destination; } |
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118 |
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119 // The destination count of the partial object referenced by this split |
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120 // (either 1 or 2). This must be added to the destination count of the |
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121 // remainder of the source region. |
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122 unsigned int destination_count() const { return _destination_count; } |
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123 |
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124 // If a word within the partial object will be written to the first word of a |
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125 // destination region, this is the address of the destination region; |
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126 // otherwise this is NULL. |
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127 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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128 |
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129 // If a word within the partial object will be written to the first word of a |
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130 // destination region, this is the address of that word within the partial |
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131 // object; otherwise this is NULL. |
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132 HeapWord* first_src_addr() const { return _first_src_addr; } |
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133 |
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134 // Record the data necessary to split the region src_region_idx. |
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135 void record(size_t src_region_idx, size_t partial_obj_size, |
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136 HeapWord* destination); |
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137 |
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138 void clear(); |
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139 |
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140 DEBUG_ONLY(void verify_clear();) |
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141 |
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142 private: |
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143 size_t _src_region_idx; |
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144 size_t _partial_obj_size; |
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145 HeapWord* _destination; |
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146 unsigned int _destination_count; |
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147 HeapWord* _dest_region_addr; |
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148 HeapWord* _first_src_addr; |
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149 }; |
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150 |
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151 inline bool SplitInfo::is_split(size_t region_idx) const |
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152 { |
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153 return _src_region_idx == region_idx && is_valid(); |
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154 } |
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155 |
0 | 156 class SpaceInfo |
157 { | |
158 public: | |
159 MutableSpace* space() const { return _space; } | |
160 | |
161 // Where the free space will start after the collection. Valid only after the | |
162 // summary phase completes. | |
163 HeapWord* new_top() const { return _new_top; } | |
164 | |
165 // Allows new_top to be set. | |
166 HeapWord** new_top_addr() { return &_new_top; } | |
167 | |
168 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
169 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
170 | |
171 // Where the dense prefix ends, or the compacted region begins. | |
172 HeapWord* dense_prefix() const { return _dense_prefix; } | |
173 | |
174 // The start array for the (generation containing the) space, or NULL if there | |
175 // is no start array. | |
176 ObjectStartArray* start_array() const { return _start_array; } | |
177 | |
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178 SplitInfo& split_info() { return _split_info; } |
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179 |
0 | 180 void set_space(MutableSpace* s) { _space = s; } |
181 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
182 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
183 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
184 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
185 | |
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186 void publish_new_top() const { _space->set_top(_new_top); } |
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187 |
0 | 188 private: |
189 MutableSpace* _space; | |
190 HeapWord* _new_top; | |
191 HeapWord* _min_dense_prefix; | |
192 HeapWord* _dense_prefix; | |
193 ObjectStartArray* _start_array; | |
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194 SplitInfo _split_info; |
0 | 195 }; |
196 | |
197 class ParallelCompactData | |
198 { | |
199 public: | |
200 // Sizes are in HeapWords, unless indicated otherwise. | |
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201 static const size_t Log2RegionSize; |
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202 static const size_t RegionSize; |
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203 static const size_t RegionSizeBytes; |
0 | 204 |
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205 // Mask for the bits in a size_t to get an offset within a region. |
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206 static const size_t RegionSizeOffsetMask; |
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207 // Mask for the bits in a pointer to get an offset within a region. |
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208 static const size_t RegionAddrOffsetMask; |
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209 // Mask for the bits in a pointer to get the address of the start of a region. |
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210 static const size_t RegionAddrMask; |
0 | 211 |
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212 class RegionData |
0 | 213 { |
214 public: | |
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215 // Destination address of the region. |
0 | 216 HeapWord* destination() const { return _destination; } |
217 | |
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218 // The first region containing data destined for this region. |
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219 size_t source_region() const { return _source_region; } |
0 | 220 |
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221 // The object (if any) starting in this region and ending in a different |
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222 // region that could not be updated during the main (parallel) compaction |
0 | 223 // phase. This is different from _partial_obj_addr, which is an object that |
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224 // extends onto a source region. However, the two uses do not overlap in |
0 | 225 // time, so the same field is used to save space. |
226 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
227 | |
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228 // The starting address of the partial object extending onto the region. |
0 | 229 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
230 | |
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231 // Size of the partial object extending onto the region (words). |
0 | 232 size_t partial_obj_size() const { return _partial_obj_size; } |
233 | |
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234 // Size of live data that lies within this region due to objects that start |
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235 // in this region (words). This does not include the partial object |
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236 // extending onto the region (if any), or the part of an object that extends |
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237 // onto the next region (if any). |
0 | 238 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
239 | |
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240 // Total live data that lies within the region (words). |
0 | 241 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
242 | |
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243 // The destination_count is the number of other regions to which data from |
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244 // this region will be copied. At the end of the summary phase, the valid |
0 | 245 // values of destination_count are |
246 // | |
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247 // 0 - data from the region will be compacted completely into itself, or the |
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248 // region is empty. The region can be claimed and then filled. |
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249 // 1 - data from the region will be compacted into 1 other region; some |
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250 // data from the region may also be compacted into the region itself. |
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251 // 2 - data from the region will be copied to 2 other regions. |
0 | 252 // |
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253 // During compaction as regions are emptied, the destination_count is |
0 | 254 // decremented (atomically) and when it reaches 0, it can be claimed and |
255 // then filled. | |
256 // | |
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257 // A region is claimed for processing by atomically changing the |
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258 // destination_count to the claimed value (dc_claimed). After a region has |
0 | 259 // been filled, the destination_count should be set to the completed value |
260 // (dc_completed). | |
261 inline uint destination_count() const; | |
262 inline uint destination_count_raw() const; | |
263 | |
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264 // The location of the java heap data that corresponds to this region. |
0 | 265 inline HeapWord* data_location() const; |
266 | |
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267 // The highest address referenced by objects in this region. |
0 | 268 inline HeapWord* highest_ref() const; |
269 | |
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270 // Whether this region is available to be claimed, has been claimed, or has |
0 | 271 // been completed. |
272 // | |
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273 // Minor subtlety: claimed() returns true if the region is marked |
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274 // completed(), which is desirable since a region must be claimed before it |
0 | 275 // can be completed. |
276 bool available() const { return _dc_and_los < dc_one; } | |
277 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
278 bool completed() const { return _dc_and_los >= dc_completed; } | |
279 | |
280 // These are not atomic. | |
281 void set_destination(HeapWord* addr) { _destination = addr; } | |
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282 void set_source_region(size_t region) { _source_region = region; } |
0 | 283 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
284 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
285 void set_partial_obj_size(size_t words) { | |
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286 _partial_obj_size = (region_sz_t) words; |
0 | 287 } |
288 | |
289 inline void set_destination_count(uint count); | |
290 inline void set_live_obj_size(size_t words); | |
291 inline void set_data_location(HeapWord* addr); | |
292 inline void set_completed(); | |
293 inline bool claim_unsafe(); | |
294 | |
295 // These are atomic. | |
296 inline void add_live_obj(size_t words); | |
297 inline void set_highest_ref(HeapWord* addr); | |
298 inline void decrement_destination_count(); | |
299 inline bool claim(); | |
300 | |
301 private: | |
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302 // The type used to represent object sizes within a region. |
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303 typedef uint region_sz_t; |
0 | 304 |
305 // Constants for manipulating the _dc_and_los field, which holds both the | |
306 // destination count and live obj size. The live obj size lives at the | |
307 // least significant end so no masking is necessary when adding. | |
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308 static const region_sz_t dc_shift; // Shift amount. |
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309 static const region_sz_t dc_mask; // Mask for destination count. |
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310 static const region_sz_t dc_one; // 1, shifted appropriately. |
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311 static const region_sz_t dc_claimed; // Region has been claimed. |
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312 static const region_sz_t dc_completed; // Region has been completed. |
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313 static const region_sz_t los_mask; // Mask for live obj size. |
0 | 314 |
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315 HeapWord* _destination; |
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316 size_t _source_region; |
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317 HeapWord* _partial_obj_addr; |
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318 region_sz_t _partial_obj_size; |
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319 region_sz_t volatile _dc_and_los; |
0 | 320 #ifdef ASSERT |
321 // These enable optimizations that are only partially implemented. Use | |
322 // debug builds to prevent the code fragments from breaking. | |
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323 HeapWord* _data_location; |
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324 HeapWord* _highest_ref; |
0 | 325 #endif // #ifdef ASSERT |
326 | |
327 #ifdef ASSERT | |
328 public: | |
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329 uint _pushed; // 0 until region is pushed onto a worker's stack |
0 | 330 private: |
331 #endif | |
332 }; | |
333 | |
334 public: | |
335 ParallelCompactData(); | |
336 bool initialize(MemRegion covered_region); | |
337 | |
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338 size_t region_count() const { return _region_count; } |
0 | 339 |
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340 // Convert region indices to/from RegionData pointers. |
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341 inline RegionData* region(size_t region_idx) const; |
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342 inline size_t region(const RegionData* const region_ptr) const; |
0 | 343 |
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344 // Returns true if the given address is contained within the region |
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345 bool region_contains(size_t region_index, HeapWord* addr); |
0 | 346 |
347 void add_obj(HeapWord* addr, size_t len); | |
348 void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } | |
349 | |
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350 // Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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351 // destination of region n is simply the start of region n. The argument beg |
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352 // must be region-aligned; end need not be. |
0 | 353 void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
354 | |
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355 HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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356 HeapWord* destination, HeapWord* target_end, |
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357 HeapWord** target_next); |
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358 bool summarize(SplitInfo& split_info, |
0 | 359 HeapWord* source_beg, HeapWord* source_end, |
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360 HeapWord** source_next, |
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361 HeapWord* target_beg, HeapWord* target_end, |
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362 HeapWord** target_next); |
0 | 363 |
364 void clear(); | |
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365 void clear_range(size_t beg_region, size_t end_region); |
0 | 366 void clear_range(HeapWord* beg, HeapWord* end) { |
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367 clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
0 | 368 } |
369 | |
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370 // Return the number of words between addr and the start of the region |
0 | 371 // containing addr. |
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372 inline size_t region_offset(const HeapWord* addr) const; |
0 | 373 |
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374 // Convert addresses to/from a region index or region pointer. |
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375 inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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376 inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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377 inline HeapWord* region_to_addr(size_t region) const; |
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378 inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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379 inline HeapWord* region_to_addr(const RegionData* region) const; |
0 | 380 |
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381 inline HeapWord* region_align_down(HeapWord* addr) const; |
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382 inline HeapWord* region_align_up(HeapWord* addr) const; |
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383 inline bool is_region_aligned(HeapWord* addr) const; |
0 | 384 |
385 // Return the address one past the end of the partial object. | |
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386 HeapWord* partial_obj_end(size_t region_idx) const; |
0 | 387 |
388 // Return the new location of the object p after the | |
389 // the compaction. | |
390 HeapWord* calc_new_pointer(HeapWord* addr); | |
391 | |
392 HeapWord* calc_new_pointer(oop p) { | |
393 return calc_new_pointer((HeapWord*) p); | |
394 } | |
395 | |
396 // Return the updated address for the given klass | |
397 klassOop calc_new_klass(klassOop); | |
398 | |
399 #ifdef ASSERT | |
400 void verify_clear(const PSVirtualSpace* vspace); | |
401 void verify_clear(); | |
402 #endif // #ifdef ASSERT | |
403 | |
404 private: | |
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405 bool initialize_region_data(size_t region_size); |
0 | 406 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
407 | |
408 private: | |
409 HeapWord* _region_start; | |
410 #ifdef ASSERT | |
411 HeapWord* _region_end; | |
412 #endif // #ifdef ASSERT | |
413 | |
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414 PSVirtualSpace* _region_vspace; |
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415 RegionData* _region_data; |
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416 size_t _region_count; |
0 | 417 }; |
418 | |
419 inline uint | |
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420 ParallelCompactData::RegionData::destination_count_raw() const |
0 | 421 { |
422 return _dc_and_los & dc_mask; | |
423 } | |
424 | |
425 inline uint | |
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426 ParallelCompactData::RegionData::destination_count() const |
0 | 427 { |
428 return destination_count_raw() >> dc_shift; | |
429 } | |
430 | |
431 inline void | |
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432 ParallelCompactData::RegionData::set_destination_count(uint count) |
0 | 433 { |
434 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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435 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
0 | 436 _dc_and_los = (count << dc_shift) | live_sz; |
437 } | |
438 | |
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439 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
0 | 440 { |
441 assert(words <= los_mask, "would overflow"); | |
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442 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
0 | 443 } |
444 | |
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445 inline void ParallelCompactData::RegionData::decrement_destination_count() |
0 | 446 { |
447 assert(_dc_and_los < dc_claimed, "already claimed"); | |
448 assert(_dc_and_los >= dc_one, "count would go negative"); | |
449 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
450 } | |
451 | |
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452 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
0 | 453 { |
454 DEBUG_ONLY(return _data_location;) | |
455 NOT_DEBUG(return NULL;) | |
456 } | |
457 | |
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458 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
0 | 459 { |
460 DEBUG_ONLY(return _highest_ref;) | |
461 NOT_DEBUG(return NULL;) | |
462 } | |
463 | |
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464 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
0 | 465 { |
466 DEBUG_ONLY(_data_location = addr;) | |
467 } | |
468 | |
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469 inline void ParallelCompactData::RegionData::set_completed() |
0 | 470 { |
471 assert(claimed(), "must be claimed first"); | |
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472 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
0 | 473 } |
474 | |
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475 // MT-unsafe claiming of a region. Should only be used during single threaded |
0 | 476 // execution. |
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477 inline bool ParallelCompactData::RegionData::claim_unsafe() |
0 | 478 { |
479 if (available()) { | |
480 _dc_and_los |= dc_claimed; | |
481 return true; | |
482 } | |
483 return false; | |
484 } | |
485 | |
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486 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
0 | 487 { |
488 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
489 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
490 } | |
491 | |
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492 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
0 | 493 { |
494 #ifdef ASSERT | |
495 HeapWord* tmp = _highest_ref; | |
496 while (addr > tmp) { | |
497 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
498 } | |
499 #endif // #ifdef ASSERT | |
500 } | |
501 | |
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502 inline bool ParallelCompactData::RegionData::claim() |
0 | 503 { |
504 const int los = (int) live_obj_size(); | |
505 const int old = Atomic::cmpxchg(dc_claimed | los, | |
506 (volatile int*) &_dc_and_los, los); | |
507 return old == los; | |
508 } | |
509 | |
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510 inline ParallelCompactData::RegionData* |
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511 ParallelCompactData::region(size_t region_idx) const |
0 | 512 { |
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513 assert(region_idx <= region_count(), "bad arg"); |
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514 return _region_data + region_idx; |
0 | 515 } |
516 | |
517 inline size_t | |
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518 ParallelCompactData::region(const RegionData* const region_ptr) const |
0 | 519 { |
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520 assert(region_ptr >= _region_data, "bad arg"); |
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521 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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522 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
0 | 523 } |
524 | |
525 inline size_t | |
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526 ParallelCompactData::region_offset(const HeapWord* addr) const |
0 | 527 { |
528 assert(addr >= _region_start, "bad addr"); | |
529 assert(addr <= _region_end, "bad addr"); | |
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530 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
0 | 531 } |
532 | |
533 inline size_t | |
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534 ParallelCompactData::addr_to_region_idx(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 pointer_delta(addr, _region_start) >> Log2RegionSize; |
0 | 539 } |
540 | |
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541 inline ParallelCompactData::RegionData* |
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542 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
0 | 543 { |
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544 return region(addr_to_region_idx(addr)); |
0 | 545 } |
546 | |
547 inline HeapWord* | |
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548 ParallelCompactData::region_to_addr(size_t region) const |
0 | 549 { |
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550 assert(region <= _region_count, "region out of range"); |
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551 return _region_start + (region << Log2RegionSize); |
0 | 552 } |
553 | |
554 inline HeapWord* | |
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555 ParallelCompactData::region_to_addr(const RegionData* region) const |
0 | 556 { |
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557 return region_to_addr(pointer_delta(region, _region_data, |
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558 sizeof(RegionData))); |
0 | 559 } |
560 | |
561 inline HeapWord* | |
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562 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
0 | 563 { |
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564 assert(region <= _region_count, "region out of range"); |
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565 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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566 return region_to_addr(region) + offset; |
0 | 567 } |
568 | |
569 inline HeapWord* | |
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570 ParallelCompactData::region_align_down(HeapWord* addr) const |
0 | 571 { |
572 assert(addr >= _region_start, "bad addr"); | |
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573 assert(addr < _region_end + RegionSize, "bad addr"); |
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574 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
0 | 575 } |
576 | |
577 inline HeapWord* | |
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578 ParallelCompactData::region_align_up(HeapWord* addr) const |
0 | 579 { |
580 assert(addr >= _region_start, "bad addr"); | |
581 assert(addr <= _region_end, "bad addr"); | |
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582 return region_align_down(addr + RegionSizeOffsetMask); |
0 | 583 } |
584 | |
585 inline bool | |
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586 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
0 | 587 { |
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588 return region_offset(addr) == 0; |
0 | 589 } |
590 | |
591 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the | |
592 // do_addr() method. | |
593 // | |
594 // The closure is initialized with the number of heap words to process | |
595 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
596 // methods in subclasses should update the total as words are processed. Since | |
597 // only one subclass actually uses this mechanism to terminate iteration, the | |
598 // default initial value is > 0. The implementation is here and not in the | |
599 // single subclass that uses it to avoid making is_full() virtual, and thus | |
600 // adding a virtual call per live object. | |
601 | |
602 class ParMarkBitMapClosure: public StackObj { | |
603 public: | |
604 typedef ParMarkBitMap::idx_t idx_t; | |
605 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
606 | |
607 public: | |
608 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
609 size_t words = max_uintx); | |
610 | |
611 inline ParCompactionManager* compaction_manager() const; | |
612 inline ParMarkBitMap* bitmap() const; | |
613 inline size_t words_remaining() const; | |
614 inline bool is_full() const; | |
615 inline HeapWord* source() const; | |
616 | |
617 inline void set_source(HeapWord* addr); | |
618 | |
619 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
620 | |
621 protected: | |
622 inline void decrement_words_remaining(size_t words); | |
623 | |
624 private: | |
625 ParMarkBitMap* const _bitmap; | |
626 ParCompactionManager* const _compaction_manager; | |
627 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
628 size_t _words_remaining; // Words left to copy. | |
629 | |
630 protected: | |
631 HeapWord* _source; // Next addr that would be read. | |
632 }; | |
633 | |
634 inline | |
635 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
636 ParCompactionManager* cm, | |
637 size_t words): | |
638 _bitmap(bitmap), _compaction_manager(cm) | |
639 #ifdef ASSERT | |
640 , _initial_words_remaining(words) | |
641 #endif | |
642 { | |
643 _words_remaining = words; | |
644 _source = NULL; | |
645 } | |
646 | |
647 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
648 return _compaction_manager; | |
649 } | |
650 | |
651 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
652 return _bitmap; | |
653 } | |
654 | |
655 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
656 return _words_remaining; | |
657 } | |
658 | |
659 inline bool ParMarkBitMapClosure::is_full() const { | |
660 return words_remaining() == 0; | |
661 } | |
662 | |
663 inline HeapWord* ParMarkBitMapClosure::source() const { | |
664 return _source; | |
665 } | |
666 | |
667 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
668 _source = addr; | |
669 } | |
670 | |
671 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
672 assert(_words_remaining >= words, "processed too many words"); | |
673 _words_remaining -= words; | |
674 } | |
675 | |
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676 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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677 // does parts of the collection using parallel threads. The collection includes |
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678 // the tenured generation and the young generation. The permanent generation is |
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679 // collected at the same time as the other two generations but the permanent |
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680 // generation is collect by a single GC thread. The permanent generation is |
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681 // collected serially because of the requirement that during the processing of a |
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682 // klass AAA, any objects reference by AAA must already have been processed. |
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683 // This requirement is enforced by a left (lower address) to right (higher |
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684 // address) sliding compaction. |
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685 // |
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686 // There are four phases of the collection. |
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687 // |
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688 // - marking phase |
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689 // - summary phase |
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690 // - compacting phase |
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691 // - clean up phase |
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692 // |
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693 // Roughly speaking these phases correspond, respectively, to |
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694 // - mark all the live objects |
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695 // - calculate the destination of each object at the end of the collection |
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696 // - move the objects to their destination |
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697 // - update some references and reinitialize some variables |
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698 // |
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699 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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700 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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701 // complete marking of the heap. The summary phase is implemented in |
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702 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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703 // in PSParallelCompact::compact(). |
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704 // |
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705 // A space that is being collected is divided into regions and with each region |
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706 // is associated an object of type ParallelCompactData. Each region is of a |
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707 // fixed size and typically will contain more than 1 object and may have parts |
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708 // of objects at the front and back of the region. |
263
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709 // |
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710 // region -----+---------------------+---------- |
263
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711 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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712 // |
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713 // The marking phase does a complete marking of all live objects in the heap. |
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714 // The marking also compiles the size of the data for all live objects covered |
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715 // by the region. This size includes the part of any live object spanning onto |
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716 // the region (part of AAA if it is live) from the front, all live objects |
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717 // contained in the region (BBB and/or CCC if they are live), and the part of |
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718 // any live objects covered by the region that extends off the region (part of |
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719 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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720 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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721 // done atomically as is the accumulation of the size of the live objects |
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722 // covered by a region. |
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723 // |
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724 // The summary phase calculates the total live data to the left of each region |
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725 // XXX. Based on that total and the bottom of the space, it can calculate the |
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726 // starting location of the live data in XXX. The summary phase calculates for |
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727 // each region XXX quantites such as |
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728 // |
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729 // - the amount of live data at the beginning of a region from an object |
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730 // entering the region. |
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731 // - the location of the first live data on the region |
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732 // - a count of the number of regions receiving live data from XXX. |
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733 // |
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734 // See ParallelCompactData for precise details. The summary phase also |
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735 // calculates the dense prefix for the compaction. The dense prefix is a |
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736 // portion at the beginning of the space that is not moved. The objects in the |
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737 // dense prefix do need to have their object references updated. See method |
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738 // summarize_dense_prefix(). |
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739 // |
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740 // The summary phase is done using 1 GC thread. |
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741 // |
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742 // The compaction phase moves objects to their new location and updates all |
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743 // references in the object. |
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744 // |
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745 // A current exception is that objects that cross a region boundary are moved |
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746 // but do not have their references updated. References are not updated because |
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747 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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748 // has been updated. KKK likely resides in a region to the left of the region |
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749 // containing AAA. These AAA's have there references updated at the end in a |
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750 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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751 // An alternate strategy is being investigated for this deferral of updating. |
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752 // |
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753 // Compaction is done on a region basis. A region that is ready to be filled is |
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754 // put on a ready list and GC threads take region off the list and fill them. A |
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755 // region is ready to be filled if it empty of live objects. Such a region may |
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756 // have been initially empty (only contained dead objects) or may have had all |
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757 // its live objects copied out already. A region that compacts into itself is |
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758 // also ready for filling. The ready list is initially filled with empty |
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759 // regions and regions compacting into themselves. There is always at least 1 |
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760 // region that can be put on the ready list. The regions are atomically added |
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761 // and removed from the ready list. |
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762 |
0 | 763 class PSParallelCompact : AllStatic { |
764 public: | |
765 // Convenient access to type names. | |
766 typedef ParMarkBitMap::idx_t idx_t; | |
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767 typedef ParallelCompactData::RegionData RegionData; |
0 | 768 |
769 typedef enum { | |
770 perm_space_id, old_space_id, eden_space_id, | |
771 from_space_id, to_space_id, last_space_id | |
772 } SpaceId; | |
773 | |
774 public: | |
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775 // Inline closure decls |
0 | 776 // |
777 class IsAliveClosure: public BoolObjectClosure { | |
778 public: | |
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779 virtual void do_object(oop p); |
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780 virtual bool do_object_b(oop p); |
0 | 781 }; |
782 | |
783 class KeepAliveClosure: public OopClosure { | |
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784 private: |
0 | 785 ParCompactionManager* _compaction_manager; |
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786 protected: |
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787 template <class T> inline void do_oop_work(T* p); |
0 | 788 public: |
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789 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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790 virtual void do_oop(oop* p); |
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791 virtual void do_oop(narrowOop* p); |
0 | 792 }; |
793 | |
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794 // Current unused |
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795 class FollowRootClosure: public OopsInGenClosure { |
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796 private: |
0 | 797 ParCompactionManager* _compaction_manager; |
798 public: | |
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799 FollowRootClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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800 virtual void do_oop(oop* p); |
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801 virtual void do_oop(narrowOop* p); |
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802 }; |
0 | 803 |
804 class FollowStackClosure: public VoidClosure { | |
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805 private: |
0 | 806 ParCompactionManager* _compaction_manager; |
807 public: | |
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808 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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809 virtual void do_void(); |
0 | 810 }; |
811 | |
812 class AdjustPointerClosure: public OopsInGenClosure { | |
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813 private: |
0 | 814 bool _is_root; |
815 public: | |
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816 AdjustPointerClosure(bool is_root) : _is_root(is_root) { } |
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817 virtual void do_oop(oop* p); |
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818 virtual void do_oop(narrowOop* p); |
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819 // do not walk from thread stacks to the code cache on this phase |
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820 virtual void do_code_blob(CodeBlob* cb) const { } |
0 | 821 }; |
822 | |
823 // Closure for verifying update of pointers. Does not | |
824 // have any side effects. | |
825 class VerifyUpdateClosure: public ParMarkBitMapClosure { | |
826 const MutableSpace* _space; // Is this ever used? | |
827 | |
828 public: | |
829 VerifyUpdateClosure(ParCompactionManager* cm, const MutableSpace* sp) : | |
830 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), _space(sp) | |
831 { } | |
832 | |
833 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
834 | |
835 const MutableSpace* space() { return _space; } | |
836 }; | |
837 | |
838 // Closure for updating objects altered for debug checking | |
839 class ResetObjectsClosure: public ParMarkBitMapClosure { | |
840 public: | |
841 ResetObjectsClosure(ParCompactionManager* cm): | |
842 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm) | |
843 { } | |
844 | |
845 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
846 }; | |
847 | |
848 friend class KeepAliveClosure; | |
849 friend class FollowStackClosure; | |
850 friend class AdjustPointerClosure; | |
851 friend class FollowRootClosure; | |
852 friend class instanceKlassKlass; | |
853 friend class RefProcTaskProxy; | |
854 | |
855 private: | |
856 static elapsedTimer _accumulated_time; | |
857 static unsigned int _total_invocations; | |
858 static unsigned int _maximum_compaction_gc_num; | |
859 static jlong _time_of_last_gc; // ms | |
860 static CollectorCounters* _counters; | |
861 static ParMarkBitMap _mark_bitmap; | |
862 static ParallelCompactData _summary_data; | |
863 static IsAliveClosure _is_alive_closure; | |
864 static SpaceInfo _space_info[last_space_id]; | |
865 static bool _print_phases; | |
866 static AdjustPointerClosure _adjust_root_pointer_closure; | |
867 static AdjustPointerClosure _adjust_pointer_closure; | |
868 | |
869 // Reference processing (used in ...follow_contents) | |
870 static ReferenceProcessor* _ref_processor; | |
871 | |
872 // Updated location of intArrayKlassObj. | |
873 static klassOop _updated_int_array_klass_obj; | |
874 | |
875 // Values computed at initialization and used by dead_wood_limiter(). | |
876 static double _dwl_mean; | |
877 static double _dwl_std_dev; | |
878 static double _dwl_first_term; | |
879 static double _dwl_adjustment; | |
880 #ifdef ASSERT | |
881 static bool _dwl_initialized; | |
882 #endif // #ifdef ASSERT | |
883 | |
884 private: | |
885 // Closure accessors | |
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886 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
0 | 887 static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&_adjust_root_pointer_closure; } |
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888 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
0 | 889 |
890 static void initialize_space_info(); | |
891 | |
892 // Return true if details about individual phases should be printed. | |
893 static inline bool print_phases(); | |
894 | |
895 // Clear the marking bitmap and summary data that cover the specified space. | |
896 static void clear_data_covering_space(SpaceId id); | |
897 | |
898 static void pre_compact(PreGCValues* pre_gc_values); | |
899 static void post_compact(); | |
900 | |
901 // Mark live objects | |
902 static void marking_phase(ParCompactionManager* cm, | |
903 bool maximum_heap_compaction); | |
904 static void follow_stack(ParCompactionManager* cm); | |
941 | 905 static void follow_weak_klass_links(); |
906 static void follow_mdo_weak_refs(); | |
0 | 907 |
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908 template <class T> static inline void adjust_pointer(T* p, bool is_root); |
0 | 909 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
910 | |
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911 template <class T> |
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912 static inline void follow_root(ParCompactionManager* cm, T* p); |
0 | 913 |
914 // Compute the dense prefix for the designated space. This is an experimental | |
915 // implementation currently not used in production. | |
916 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
917 bool maximum_compaction); | |
918 | |
919 // Methods used to compute the dense prefix. | |
920 | |
921 // Compute the value of the normal distribution at x = density. The mean and | |
922 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
923 static inline double normal_distribution(double density); | |
924 | |
925 // Initialize the static vars used by dead_wood_limiter(). | |
926 static void initialize_dead_wood_limiter(); | |
927 | |
928 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
929 // not reclaimed). | |
930 static double dead_wood_limiter(double density, size_t min_percent); | |
931 | |
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932 // Find the first (left-most) region in the range [beg, end) that has at least |
0 | 933 // dead_words of dead space to the left. The argument beg must be the first |
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934 // region in the space that is not completely live. |
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935 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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936 const RegionData* end, |
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937 size_t dead_words); |
0 | 938 |
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939 // Return a pointer to the first region in the range [beg, end) that is not |
0 | 940 // completely full. |
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941 static RegionData* first_dead_space_region(const RegionData* beg, |
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942 const RegionData* end); |
0 | 943 |
944 // Return a value indicating the benefit or 'yield' if the compacted region | |
945 // were to start (or equivalently if the dense prefix were to end) at the | |
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946 // candidate region. Higher values are better. |
0 | 947 // |
948 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
949 // updating references in the dense prefix plus (b) copying objects and | |
950 // updating references in the compacted region. | |
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951 static inline double reclaimed_ratio(const RegionData* const candidate, |
0 | 952 HeapWord* const bottom, |
953 HeapWord* const top, | |
954 HeapWord* const new_top); | |
955 | |
956 // Compute the dense prefix for the designated space. | |
957 static HeapWord* compute_dense_prefix(const SpaceId id, | |
958 bool maximum_compaction); | |
959 | |
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960 // Return true if dead space crosses onto the specified Region; bit must be |
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961 // the bit index corresponding to the first word of the Region. |
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962 static inline bool dead_space_crosses_boundary(const RegionData* region, |
0 | 963 idx_t bit); |
964 | |
965 // Summary phase utility routine to fill dead space (if any) at the dense | |
966 // prefix boundary. Should only be called if the the dense prefix is | |
967 // non-empty. | |
968 static void fill_dense_prefix_end(SpaceId id); | |
969 | |
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970 // Clear the summary data source_region field for the specified addresses. |
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971 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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972 |
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973 #ifndef PRODUCT |
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974 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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975 |
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976 // Fill the region [start, start + words) with live object(s). Only usable |
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977 // for the old and permanent generations. |
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978 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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979 size_t words); |
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980 // Include the new objects in the summary data. |
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981 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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982 |
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983 // Add live objects to a survivor space since it's rare that both survivors |
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984 // are non-empty. |
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985 static void provoke_split_fill_survivor(SpaceId id); |
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986 |
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987 // Add live objects and/or choose the dense prefix to provoke splitting. |
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988 static void provoke_split(bool & maximum_compaction); |
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989 #endif |
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990 |
0 | 991 static void summarize_spaces_quick(); |
992 static void summarize_space(SpaceId id, bool maximum_compaction); | |
993 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
994 | |
995 // Adjust addresses in roots. Does not adjust addresses in heap. | |
996 static void adjust_roots(); | |
997 | |
998 // Serial code executed in preparation for the compaction phase. | |
999 static void compact_prologue(); | |
1000 | |
1001 // Move objects to new locations. | |
1002 static void compact_perm(ParCompactionManager* cm); | |
1003 static void compact(); | |
1004 | |
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1005 // Add available regions to the stack and draining tasks to the task queue. |
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1006 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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1007 uint parallel_gc_threads); |
0 | 1008 |
1009 // Add dense prefix update tasks to the task queue. | |
1010 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
1011 uint parallel_gc_threads); | |
1012 | |
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1013 // Add region stealing tasks to the task queue. |
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1014 static void enqueue_region_stealing_tasks( |
0 | 1015 GCTaskQueue* q, |
1016 ParallelTaskTerminator* terminator_ptr, | |
1017 uint parallel_gc_threads); | |
1018 | |
1019 // For debugging only - compacts the old gen serially | |
1020 static void compact_serial(ParCompactionManager* cm); | |
1021 | |
1022 // If objects are left in eden after a collection, try to move the boundary | |
1023 // and absorb them into the old gen. Returns true if eden was emptied. | |
1024 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
1025 PSYoungGen* young_gen, | |
1026 PSOldGen* old_gen); | |
1027 | |
1028 // Reset time since last full gc | |
1029 static void reset_millis_since_last_gc(); | |
1030 | |
1031 protected: | |
1032 #ifdef VALIDATE_MARK_SWEEP | |
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1033 static GrowableArray<void*>* _root_refs_stack; |
0 | 1034 static GrowableArray<oop> * _live_oops; |
1035 static GrowableArray<oop> * _live_oops_moved_to; | |
1036 static GrowableArray<size_t>* _live_oops_size; | |
1037 static size_t _live_oops_index; | |
1038 static size_t _live_oops_index_at_perm; | |
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1039 static GrowableArray<void*>* _other_refs_stack; |
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1040 static GrowableArray<void*>* _adjusted_pointers; |
0 | 1041 static bool _pointer_tracking; |
1042 static bool _root_tracking; | |
1043 | |
1044 // The following arrays are saved since the time of the last GC and | |
1045 // assist in tracking down problems where someone has done an errant | |
1046 // store into the heap, usually to an oop that wasn't properly | |
1047 // handleized across a GC. If we crash or otherwise fail before the | |
1048 // next GC, we can query these arrays to find out the object we had | |
1049 // intended to do the store to (assuming it is still alive) and the | |
1050 // offset within that object. Covered under RecordMarkSweepCompaction. | |
1051 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
1052 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
1053 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
1054 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
1055 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
1056 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
1057 #endif | |
1058 | |
1059 public: | |
1060 class MarkAndPushClosure: public OopClosure { | |
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1061 private: |
0 | 1062 ParCompactionManager* _compaction_manager; |
1063 public: | |
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1064 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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1065 virtual void do_oop(oop* p); |
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1066 virtual void do_oop(narrowOop* p); |
0 | 1067 }; |
1068 | |
1069 PSParallelCompact(); | |
1070 | |
1071 // Convenient accessor for Universe::heap(). | |
1072 static ParallelScavengeHeap* gc_heap() { | |
1073 return (ParallelScavengeHeap*)Universe::heap(); | |
1074 } | |
1075 | |
1076 static void invoke(bool maximum_heap_compaction); | |
1077 static void invoke_no_policy(bool maximum_heap_compaction); | |
1078 | |
1079 static void post_initialize(); | |
1080 // Perform initialization for PSParallelCompact that requires | |
1081 // allocations. This should be called during the VM initialization | |
1082 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
1083 // in the event of a failure. | |
1084 static bool initialize(); | |
1085 | |
1086 // Public accessors | |
1087 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
1088 static unsigned int total_invocations() { return _total_invocations; } | |
1089 static CollectorCounters* counters() { return _counters; } | |
1090 | |
1091 // Used to add tasks | |
1092 static GCTaskManager* const gc_task_manager(); | |
1093 static klassOop updated_int_array_klass_obj() { | |
1094 return _updated_int_array_klass_obj; | |
1095 } | |
1096 | |
1097 // Marking support | |
1098 static inline bool mark_obj(oop obj); | |
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1099 // Check mark and maybe push on marking stack |
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1100 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1101 T* p); |
0 | 1102 |
1103 // Compaction support. | |
1104 // Return true if p is in the range [beg_addr, end_addr). | |
1105 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1106 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1107 | |
1108 // Convenience wrappers for per-space data kept in _space_info. | |
1109 static inline MutableSpace* space(SpaceId space_id); | |
1110 static inline HeapWord* new_top(SpaceId space_id); | |
1111 static inline HeapWord* dense_prefix(SpaceId space_id); | |
1112 static inline ObjectStartArray* start_array(SpaceId space_id); | |
1113 | |
1114 // Return true if the klass should be updated. | |
1115 static inline bool should_update_klass(klassOop k); | |
1116 | |
1117 // Move and update the live objects in the specified space. | |
1118 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
1119 | |
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1120 // Process the end of the given region range in the dense prefix. |
0 | 1121 // This includes saving any object not updated. |
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1122 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1123 size_t region_start_index, |
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1124 size_t region_end_index, |
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1125 idx_t exiting_object_offset, |
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1126 idx_t region_offset_start, |
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1127 idx_t region_offset_end); |
0 | 1128 |
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1129 // Update a region in the dense prefix. For each live object |
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1130 // in the region, update it's interior references. For each |
0 | 1131 // dead object, fill it with deadwood. Dead space at the end |
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1132 // of a region range will be filled to the start of the next |
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1133 // live object regardless of the region_index_end. None of the |
0 | 1134 // objects in the dense prefix move and dead space is dead |
1135 // (holds only dead objects that don't need any processing), so | |
1136 // dead space can be filled in any order. | |
1137 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
1138 SpaceId space_id, | |
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1139 size_t region_index_start, |
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1140 size_t region_index_end); |
0 | 1141 |
1142 // Return the address of the count + 1st live word in the range [beg, end). | |
1143 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
1144 | |
1145 // Return the address of the word to be copied to dest_addr, which must be | |
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1146 // aligned to a region boundary. |
0 | 1147 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
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1148 SpaceId src_space_id, |
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1149 size_t src_region_idx); |
0 | 1150 |
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1151 // Determine the next source region, set closure.source() to the start of the |
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1152 // new region return the region index. Parameter end_addr is the address one |
0 | 1153 // beyond the end of source range just processed. If necessary, switch to a |
1154 // new source space and set src_space_id (in-out parameter) and src_space_top | |
1155 // (out parameter) accordingly. | |
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1156 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1157 SpaceId& src_space_id, |
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1158 HeapWord*& src_space_top, |
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1159 HeapWord* end_addr); |
0 | 1160 |
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1161 // Decrement the destination count for each non-empty source region in the |
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1162 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1163 // count for a region goes to 0 and it needs to be filled, enqueue it. |
0 | 1164 static void decrement_destination_counts(ParCompactionManager* cm, |
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1165 SpaceId src_space_id, |
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1166 size_t beg_region, |
0 | 1167 HeapWord* end_addr); |
1168 | |
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1169 // Fill a region, copying objects from one or more source regions. |
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1170 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1171 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1172 fill_region(cm, region); |
0 | 1173 } |
1174 | |
1175 // Update the deferred objects in the space. | |
1176 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
1177 | |
1178 // Mark pointer and follow contents. | |
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1179 template <class T> |
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1180 static inline void mark_and_follow(ParCompactionManager* cm, T* p); |
0 | 1181 |
1182 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
1183 static ParallelCompactData& summary_data() { return _summary_data; } | |
1184 | |
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1185 static inline void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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1186 static inline void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
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1187 |
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1188 template <class T> |
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1189 static inline void adjust_pointer(T* p, |
0 | 1190 HeapWord* beg_addr, |
1191 HeapWord* end_addr); | |
1192 | |
1193 // Reference Processing | |
1194 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
1195 | |
1196 // Return the SpaceId for the given address. | |
1197 static SpaceId space_id(HeapWord* addr); | |
1198 | |
1199 // Time since last full gc (in milliseconds). | |
1200 static jlong millis_since_last_gc(); | |
1201 | |
1202 #ifdef VALIDATE_MARK_SWEEP | |
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1203 static void track_adjusted_pointer(void* p, bool isroot); |
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1204 static void check_adjust_pointer(void* p); |
0 | 1205 static void track_interior_pointers(oop obj); |
1206 static void check_interior_pointers(); | |
1207 | |
1208 static void reset_live_oop_tracking(bool at_perm); | |
1209 static void register_live_oop(oop p, size_t size); | |
1210 static void validate_live_oop(oop p, size_t size); | |
1211 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
1212 static void compaction_complete(); | |
1213 | |
1214 // Querying operation of RecordMarkSweepCompaction results. | |
1215 // Finds and prints the current base oop and offset for a word | |
1216 // within an oop that was live during the last GC. Helpful for | |
1217 // tracking down heap stomps. | |
1218 static void print_new_location_of_heap_address(HeapWord* q); | |
1219 #endif // #ifdef VALIDATE_MARK_SWEEP | |
1220 | |
1221 // Call backs for class unloading | |
1222 // Update subklass/sibling/implementor links at end of marking. | |
1223 static void revisit_weak_klass_link(ParCompactionManager* cm, Klass* k); | |
1224 | |
941 | 1225 // Clear unmarked oops in MDOs at the end of marking. |
1226 static void revisit_mdo(ParCompactionManager* cm, DataLayout* p); | |
1227 | |
0 | 1228 #ifndef PRODUCT |
1229 // Debugging support. | |
1230 static const char* space_names[last_space_id]; | |
375
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1231 static void print_region_ranges(); |
0 | 1232 static void print_dense_prefix_stats(const char* const algorithm, |
1233 const SpaceId id, | |
1234 const bool maximum_compaction, | |
1235 HeapWord* const addr); | |
482
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1236 static void summary_phase_msg(SpaceId dst_space_id, |
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1237 HeapWord* dst_beg, HeapWord* dst_end, |
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1238 SpaceId src_space_id, |
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1239 HeapWord* src_beg, HeapWord* src_end); |
0 | 1240 #endif // #ifndef PRODUCT |
1241 | |
1242 #ifdef ASSERT | |
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1243 // Sanity check the new location of a word in the heap. |
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1244 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1245 // Verify that all the regions have been emptied. |
0 | 1246 static void verify_complete(SpaceId space_id); |
1247 #endif // #ifdef ASSERT | |
1248 }; | |
1249 | |
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1250 inline bool PSParallelCompact::mark_obj(oop obj) { |
0 | 1251 const int obj_size = obj->size(); |
1252 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
1253 _summary_data.add_obj(obj, obj_size); | |
1254 return true; | |
1255 } else { | |
1256 return false; | |
1257 } | |
1258 } | |
1259 | |
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1260 template <class T> |
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1261 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1262 assert(!Universe::heap()->is_in_reserved(p), |
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1263 "roots shouldn't be things within the heap"); |
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1264 #ifdef VALIDATE_MARK_SWEEP |
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1265 if (ValidateMarkSweep) { |
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1266 guarantee(!_root_refs_stack->contains(p), "should only be in here once"); |
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1267 _root_refs_stack->push(p); |
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1268 } |
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1269 #endif |
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1270 T heap_oop = oopDesc::load_heap_oop(p); |
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1271 if (!oopDesc::is_null(heap_oop)) { |
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1272 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1273 if (mark_bitmap()->is_unmarked(obj)) { |
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1274 if (mark_obj(obj)) { |
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1275 obj->follow_contents(cm); |
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1276 } |
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1277 } |
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1278 } |
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1279 follow_stack(cm); |
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1280 } |
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1281 |
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1282 template <class T> |
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1283 inline void PSParallelCompact::mark_and_follow(ParCompactionManager* cm, |
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1284 T* p) { |
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1285 T heap_oop = oopDesc::load_heap_oop(p); |
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1286 if (!oopDesc::is_null(heap_oop)) { |
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1287 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1288 if (mark_bitmap()->is_unmarked(obj)) { |
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1289 if (mark_obj(obj)) { |
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1290 obj->follow_contents(cm); |
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1291 } |
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1292 } |
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1293 } |
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1294 } |
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1295 |
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1296 template <class T> |
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1297 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1298 T heap_oop = oopDesc::load_heap_oop(p); |
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1299 if (!oopDesc::is_null(heap_oop)) { |
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1300 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1301 if (mark_bitmap()->is_unmarked(obj)) { |
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1302 if (mark_obj(obj)) { |
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1303 // This thread marked the object and owns the subsequent processing of it. |
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1304 cm->save_for_scanning(obj); |
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1305 } |
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1306 } |
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1307 } |
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1308 } |
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1309 |
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1310 template <class T> |
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1311 inline void PSParallelCompact::adjust_pointer(T* p, bool isroot) { |
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1312 T heap_oop = oopDesc::load_heap_oop(p); |
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1313 if (!oopDesc::is_null(heap_oop)) { |
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1314 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1315 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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1316 assert(new_obj != NULL || // is forwarding ptr? |
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1317 obj->is_shared(), // never forwarded? |
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1318 "should be forwarded"); |
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1319 // Just always do the update unconditionally? |
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1320 if (new_obj != NULL) { |
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1321 assert(Universe::heap()->is_in_reserved(new_obj), |
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1322 "should be in object space"); |
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1323 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1324 } |
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1325 } |
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1326 VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot)); |
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1327 } |
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1328 |
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1329 template <class T> |
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1330 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1331 #ifdef VALIDATE_MARK_SWEEP |
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1332 if (ValidateMarkSweep) { |
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1333 if (!Universe::heap()->is_in_reserved(p)) { |
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1334 _root_refs_stack->push(p); |
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1335 } else { |
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1336 _other_refs_stack->push(p); |
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1337 } |
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1338 } |
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1339 #endif |
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1340 mark_and_push(_compaction_manager, p); |
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1341 } |
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1342 |
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1343 inline bool PSParallelCompact::print_phases() { |
0 | 1344 return _print_phases; |
1345 } | |
1346 | |
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1347 inline double PSParallelCompact::normal_distribution(double density) { |
0 | 1348 assert(_dwl_initialized, "uninitialized"); |
1349 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
1350 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
1351 } | |
1352 | |
1353 inline bool | |
375
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1354 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
0 | 1355 idx_t bit) |
1356 { | |
375
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1357 assert(bit > 0, "cannot call this for the first bit/region"); |
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1358 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
0 | 1359 "sanity check"); |
1360 | |
1361 // Dead space crosses the boundary if (1) a partial object does not extend | |
375
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1362 // onto the region, (2) an object does not start at the beginning of the |
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1363 // region, and (3) an object does not end at the end of the prior region. |
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1364 return region->partial_obj_size() == 0 && |
0 | 1365 !_mark_bitmap.is_obj_beg(bit) && |
1366 !_mark_bitmap.is_obj_end(bit - 1); | |
1367 } | |
1368 | |
1369 inline bool | |
1370 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1371 return p >= beg_addr && p < end_addr; | |
1372 } | |
1373 | |
1374 inline bool | |
1375 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1376 return is_in((HeapWord*)p, beg_addr, end_addr); | |
1377 } | |
1378 | |
1379 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
1380 assert(id < last_space_id, "id out of range"); | |
1381 return _space_info[id].space(); | |
1382 } | |
1383 | |
1384 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
1385 assert(id < last_space_id, "id out of range"); | |
1386 return _space_info[id].new_top(); | |
1387 } | |
1388 | |
1389 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
1390 assert(id < last_space_id, "id out of range"); | |
1391 return _space_info[id].dense_prefix(); | |
1392 } | |
1393 | |
1394 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
1395 assert(id < last_space_id, "id out of range"); | |
1396 return _space_info[id].start_array(); | |
1397 } | |
1398 | |
1399 inline bool PSParallelCompact::should_update_klass(klassOop k) { | |
1400 return ((HeapWord*) k) >= dense_prefix(perm_space_id); | |
1401 } | |
1402 | |
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1403 template <class T> |
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1404 inline void PSParallelCompact::adjust_pointer(T* p, |
0 | 1405 HeapWord* beg_addr, |
1406 HeapWord* end_addr) { | |
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1407 if (is_in((HeapWord*)p, beg_addr, end_addr)) { |
0 | 1408 adjust_pointer(p); |
1409 } | |
1410 } | |
1411 | |
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1412 #ifdef ASSERT |
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1413 inline void |
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1414 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1415 { |
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1416 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1417 "must move left or to a different space"); |
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1418 } |
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1419 #endif // ASSERT |
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1420 |
0 | 1421 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
1422 public: | |
1423 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
1424 ObjectStartArray* start_array, | |
1425 HeapWord* destination, size_t words); | |
1426 | |
1427 // Accessors. | |
1428 HeapWord* destination() const { return _destination; } | |
1429 | |
1430 // If the object will fit (size <= words_remaining()), copy it to the current | |
1431 // destination, update the interior oops and the start array and return either | |
1432 // full (if the closure is full) or incomplete. If the object will not fit, | |
1433 // return would_overflow. | |
1434 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
1435 | |
1436 // Copy enough words to fill this closure, starting at source(). Interior | |
1437 // oops and the start array are not updated. Return full. | |
1438 IterationStatus copy_until_full(); | |
1439 | |
1440 // Copy enough words to fill this closure or to the end of an object, | |
1441 // whichever is smaller, starting at source(). Interior oops and the start | |
1442 // array are not updated. | |
1443 void copy_partial_obj(); | |
1444 | |
1445 protected: | |
1446 // Update variables to indicate that word_count words were processed. | |
1447 inline void update_state(size_t word_count); | |
1448 | |
1449 protected: | |
1450 ObjectStartArray* const _start_array; | |
1451 HeapWord* _destination; // Next addr to be written. | |
1452 }; | |
1453 | |
1454 inline | |
1455 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
1456 ParCompactionManager* cm, | |
1457 ObjectStartArray* start_array, | |
1458 HeapWord* destination, | |
1459 size_t words) : | |
1460 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
1461 { | |
1462 _destination = destination; | |
1463 } | |
1464 | |
1465 inline void MoveAndUpdateClosure::update_state(size_t words) | |
1466 { | |
1467 decrement_words_remaining(words); | |
1468 _source += words; | |
1469 _destination += words; | |
1470 } | |
1471 | |
1472 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
1473 private: | |
1474 const PSParallelCompact::SpaceId _space_id; | |
1475 ObjectStartArray* const _start_array; | |
1476 | |
1477 public: | |
1478 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
1479 ParCompactionManager* cm, | |
1480 PSParallelCompact::SpaceId space_id); | |
1481 | |
1482 // Update the object. | |
1483 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
1484 | |
1485 inline void do_addr(HeapWord* addr); | |
1486 }; | |
1487 | |
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1488 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1489 { |
0 | 1490 _start_array->allocate_block(addr); |
1491 oop(addr)->update_contents(compaction_manager()); | |
1492 } | |
1493 | |
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1494 class FillClosure: public ParMarkBitMapClosure |
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1495 { |
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1496 public: |
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1497 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
0 | 1498 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
481
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1499 _start_array(PSParallelCompact::start_array(space_id)) |
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1500 { |
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1501 assert(space_id == PSParallelCompact::perm_space_id || |
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1502 space_id == PSParallelCompact::old_space_id, |
0 | 1503 "cannot use FillClosure in the young gen"); |
1504 } | |
1505 | |
1506 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
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1507 CollectedHeap::fill_with_objects(addr, size); |
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1508 HeapWord* const end = addr + size; |
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1509 do { |
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1510 _start_array->allocate_block(addr); |
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1511 addr += oop(addr)->size(); |
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1512 } while (addr < end); |
0 | 1513 return ParMarkBitMap::incomplete; |
1514 } | |
1515 | |
1516 private: | |
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1517 ObjectStartArray* const _start_array; |
0 | 1518 }; |