Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 4ca6dc0799b6 |
children | 7848fc12602b |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
29 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
30 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" | |
31 #include "gc_implementation/shared/collectorCounters.hpp" | |
32 #include "gc_implementation/shared/markSweep.hpp" | |
33 #include "gc_implementation/shared/mutableSpace.hpp" | |
34 #include "memory/sharedHeap.hpp" | |
35 #include "oops/oop.hpp" | |
36 | |
0 | 37 class ParallelScavengeHeap; |
38 class PSAdaptiveSizePolicy; | |
39 class PSYoungGen; | |
40 class PSOldGen; | |
41 class ParCompactionManager; | |
42 class ParallelTaskTerminator; | |
43 class PSParallelCompact; | |
44 class GCTaskManager; | |
45 class GCTaskQueue; | |
46 class PreGCValues; | |
47 class MoveAndUpdateClosure; | |
48 class RefProcTaskExecutor; | |
10405 | 49 class ParallelOldTracer; |
50 class STWGCTimer; | |
0 | 51 |
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52 // The SplitInfo class holds the information needed to 'split' a source region |
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53 // so that the live data can be copied to two destination *spaces*. Normally, |
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54 // all the live data in a region is copied to a single destination space (e.g., |
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55 // everything live in a region in eden is copied entirely into the old gen). |
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56 // However, when the heap is nearly full, all the live data in eden may not fit |
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57 // into the old gen. Copying only some of the regions from eden to old gen |
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58 // requires finding a region that does not contain a partial object (i.e., no |
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59 // live object crosses the region boundary) somewhere near the last object that |
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60 // does fit into the old gen. Since it's not always possible to find such a |
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61 // region, splitting is necessary for predictable behavior. |
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62 // |
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63 // A region is always split at the end of the partial object. This avoids |
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64 // additional tests when calculating the new location of a pointer, which is a |
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65 // very hot code path. The partial object and everything to its left will be |
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66 // copied to another space (call it dest_space_1). The live data to the right |
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67 // of the partial object will be copied either within the space itself, or to a |
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68 // different destination space (distinct from dest_space_1). |
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69 // |
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70 // Split points are identified during the summary phase, when region |
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71 // destinations are computed: data about the split, including the |
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72 // partial_object_size, is recorded in a SplitInfo record and the |
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73 // partial_object_size field in the summary data is set to zero. The zeroing is |
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74 // possible (and necessary) since the partial object will move to a different |
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75 // destination space than anything to its right, thus the partial object should |
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76 // not affect the locations of any objects to its right. |
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77 // |
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78 // The recorded data is used during the compaction phase, but only rarely: when |
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79 // the partial object on the split region will be copied across a destination |
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80 // region boundary. This test is made once each time a region is filled, and is |
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81 // a simple address comparison, so the overhead is negligible (see |
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82 // PSParallelCompact::first_src_addr()). |
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83 // |
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84 // Notes: |
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85 // |
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86 // Only regions with partial objects are split; a region without a partial |
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87 // object does not need any extra bookkeeping. |
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88 // |
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89 // At most one region is split per space, so the amount of data required is |
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90 // constant. |
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91 // |
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92 // A region is split only when the destination space would overflow. Once that |
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93 // happens, the destination space is abandoned and no other data (even from |
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94 // other source spaces) is targeted to that destination space. Abandoning the |
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95 // destination space may leave a somewhat large unused area at the end, if a |
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96 // large object caused the overflow. |
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97 // |
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98 // Future work: |
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99 // |
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100 // More bookkeeping would be required to continue to use the destination space. |
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101 // The most general solution would allow data from regions in two different |
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102 // source spaces to be "joined" in a single destination region. At the very |
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103 // least, additional code would be required in next_src_region() to detect the |
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104 // join and skip to an out-of-order source region. If the join region was also |
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105 // the last destination region to which a split region was copied (the most |
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106 // likely case), then additional work would be needed to get fill_region() to |
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107 // stop iteration and switch to a new source region at the right point. Basic |
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108 // idea would be to use a fake value for the top of the source space. It is |
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109 // doable, if a bit tricky. |
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110 // |
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111 // A simpler (but less general) solution would fill the remainder of the |
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112 // destination region with a dummy object and continue filling the next |
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113 // destination region. |
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114 |
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115 class SplitInfo |
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116 { |
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117 public: |
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118 // Return true if this split info is valid (i.e., if a split has been |
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119 // recorded). The very first region cannot have a partial object and thus is |
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120 // never split, so 0 is the 'invalid' value. |
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121 bool is_valid() const { return _src_region_idx > 0; } |
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122 |
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123 // Return true if this split holds data for the specified source region. |
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124 inline bool is_split(size_t source_region) const; |
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125 |
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126 // The index of the split region, the size of the partial object on that |
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127 // region and the destination of the partial object. |
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128 size_t src_region_idx() const { return _src_region_idx; } |
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129 size_t partial_obj_size() const { return _partial_obj_size; } |
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130 HeapWord* destination() const { return _destination; } |
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131 |
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132 // The destination count of the partial object referenced by this split |
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133 // (either 1 or 2). This must be added to the destination count of the |
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134 // remainder of the source region. |
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135 unsigned int destination_count() const { return _destination_count; } |
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136 |
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137 // If a word within the partial object will be written to the first word of a |
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138 // destination region, this is the address of the destination region; |
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139 // otherwise this is NULL. |
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140 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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141 |
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142 // If a word within the partial object will be written to the first word of a |
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143 // destination region, this is the address of that word within the partial |
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144 // object; otherwise this is NULL. |
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145 HeapWord* first_src_addr() const { return _first_src_addr; } |
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146 |
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147 // Record the data necessary to split the region src_region_idx. |
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148 void record(size_t src_region_idx, size_t partial_obj_size, |
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149 HeapWord* destination); |
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150 |
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151 void clear(); |
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152 |
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153 DEBUG_ONLY(void verify_clear();) |
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154 |
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155 private: |
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156 size_t _src_region_idx; |
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157 size_t _partial_obj_size; |
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158 HeapWord* _destination; |
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159 unsigned int _destination_count; |
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160 HeapWord* _dest_region_addr; |
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161 HeapWord* _first_src_addr; |
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162 }; |
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163 |
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164 inline bool SplitInfo::is_split(size_t region_idx) const |
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165 { |
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166 return _src_region_idx == region_idx && is_valid(); |
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167 } |
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168 |
0 | 169 class SpaceInfo |
170 { | |
171 public: | |
172 MutableSpace* space() const { return _space; } | |
173 | |
174 // Where the free space will start after the collection. Valid only after the | |
175 // summary phase completes. | |
176 HeapWord* new_top() const { return _new_top; } | |
177 | |
178 // Allows new_top to be set. | |
179 HeapWord** new_top_addr() { return &_new_top; } | |
180 | |
181 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
182 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
183 | |
184 // Where the dense prefix ends, or the compacted region begins. | |
185 HeapWord* dense_prefix() const { return _dense_prefix; } | |
186 | |
187 // The start array for the (generation containing the) space, or NULL if there | |
188 // is no start array. | |
189 ObjectStartArray* start_array() const { return _start_array; } | |
190 | |
482
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191 SplitInfo& split_info() { return _split_info; } |
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192 |
0 | 193 void set_space(MutableSpace* s) { _space = s; } |
194 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
195 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
196 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
197 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
198 | |
482
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199 void publish_new_top() const { _space->set_top(_new_top); } |
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200 |
0 | 201 private: |
202 MutableSpace* _space; | |
203 HeapWord* _new_top; | |
204 HeapWord* _min_dense_prefix; | |
205 HeapWord* _dense_prefix; | |
206 ObjectStartArray* _start_array; | |
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207 SplitInfo _split_info; |
0 | 208 }; |
209 | |
210 class ParallelCompactData | |
211 { | |
212 public: | |
213 // Sizes are in HeapWords, unless indicated otherwise. | |
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214 static const size_t Log2RegionSize; |
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215 static const size_t RegionSize; |
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216 static const size_t RegionSizeBytes; |
0 | 217 |
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218 // Mask for the bits in a size_t to get an offset within a region. |
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219 static const size_t RegionSizeOffsetMask; |
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220 // Mask for the bits in a pointer to get an offset within a region. |
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221 static const size_t RegionAddrOffsetMask; |
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222 // Mask for the bits in a pointer to get the address of the start of a region. |
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223 static const size_t RegionAddrMask; |
0 | 224 |
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225 static const size_t Log2BlockSize; |
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226 static const size_t BlockSize; |
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227 static const size_t BlockSizeBytes; |
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228 |
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229 static const size_t BlockSizeOffsetMask; |
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230 static const size_t BlockAddrOffsetMask; |
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231 static const size_t BlockAddrMask; |
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232 |
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233 static const size_t BlocksPerRegion; |
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234 static const size_t Log2BlocksPerRegion; |
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235 |
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236 class RegionData |
0 | 237 { |
238 public: | |
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239 // Destination address of the region. |
0 | 240 HeapWord* destination() const { return _destination; } |
241 | |
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242 // The first region containing data destined for this region. |
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243 size_t source_region() const { return _source_region; } |
0 | 244 |
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245 // The object (if any) starting in this region and ending in a different |
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246 // region that could not be updated during the main (parallel) compaction |
0 | 247 // phase. This is different from _partial_obj_addr, which is an object that |
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248 // extends onto a source region. However, the two uses do not overlap in |
0 | 249 // time, so the same field is used to save space. |
250 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
251 | |
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252 // The starting address of the partial object extending onto the region. |
0 | 253 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
254 | |
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255 // Size of the partial object extending onto the region (words). |
0 | 256 size_t partial_obj_size() const { return _partial_obj_size; } |
257 | |
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258 // Size of live data that lies within this region due to objects that start |
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259 // in this region (words). This does not include the partial object |
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260 // extending onto the region (if any), or the part of an object that extends |
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261 // onto the next region (if any). |
0 | 262 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
263 | |
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264 // Total live data that lies within the region (words). |
0 | 265 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
266 | |
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267 // The destination_count is the number of other regions to which data from |
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268 // this region will be copied. At the end of the summary phase, the valid |
0 | 269 // values of destination_count are |
270 // | |
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271 // 0 - data from the region will be compacted completely into itself, or the |
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272 // region is empty. The region can be claimed and then filled. |
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273 // 1 - data from the region will be compacted into 1 other region; some |
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274 // data from the region may also be compacted into the region itself. |
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275 // 2 - data from the region will be copied to 2 other regions. |
0 | 276 // |
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277 // During compaction as regions are emptied, the destination_count is |
0 | 278 // decremented (atomically) and when it reaches 0, it can be claimed and |
279 // then filled. | |
280 // | |
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281 // A region is claimed for processing by atomically changing the |
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282 // destination_count to the claimed value (dc_claimed). After a region has |
0 | 283 // been filled, the destination_count should be set to the completed value |
284 // (dc_completed). | |
285 inline uint destination_count() const; | |
286 inline uint destination_count_raw() const; | |
287 | |
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288 // Whether the block table for this region has been filled. |
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289 inline bool blocks_filled() const; |
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290 |
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291 // Number of times the block table was filled. |
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292 DEBUG_ONLY(inline size_t blocks_filled_count() const;) |
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293 |
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294 // The location of the java heap data that corresponds to this region. |
0 | 295 inline HeapWord* data_location() const; |
296 | |
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297 // The highest address referenced by objects in this region. |
0 | 298 inline HeapWord* highest_ref() const; |
299 | |
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300 // Whether this region is available to be claimed, has been claimed, or has |
0 | 301 // been completed. |
302 // | |
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303 // Minor subtlety: claimed() returns true if the region is marked |
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304 // completed(), which is desirable since a region must be claimed before it |
0 | 305 // can be completed. |
306 bool available() const { return _dc_and_los < dc_one; } | |
307 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
308 bool completed() const { return _dc_and_los >= dc_completed; } | |
309 | |
310 // These are not atomic. | |
311 void set_destination(HeapWord* addr) { _destination = addr; } | |
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312 void set_source_region(size_t region) { _source_region = region; } |
0 | 313 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
314 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
315 void set_partial_obj_size(size_t words) { | |
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316 _partial_obj_size = (region_sz_t) words; |
0 | 317 } |
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318 inline void set_blocks_filled(); |
0 | 319 |
320 inline void set_destination_count(uint count); | |
321 inline void set_live_obj_size(size_t words); | |
322 inline void set_data_location(HeapWord* addr); | |
323 inline void set_completed(); | |
324 inline bool claim_unsafe(); | |
325 | |
326 // These are atomic. | |
327 inline void add_live_obj(size_t words); | |
328 inline void set_highest_ref(HeapWord* addr); | |
329 inline void decrement_destination_count(); | |
330 inline bool claim(); | |
331 | |
332 private: | |
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333 // The type used to represent object sizes within a region. |
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334 typedef uint region_sz_t; |
0 | 335 |
336 // Constants for manipulating the _dc_and_los field, which holds both the | |
337 // destination count and live obj size. The live obj size lives at the | |
338 // least significant end so no masking is necessary when adding. | |
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339 static const region_sz_t dc_shift; // Shift amount. |
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340 static const region_sz_t dc_mask; // Mask for destination count. |
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341 static const region_sz_t dc_one; // 1, shifted appropriately. |
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342 static const region_sz_t dc_claimed; // Region has been claimed. |
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343 static const region_sz_t dc_completed; // Region has been completed. |
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344 static const region_sz_t los_mask; // Mask for live obj size. |
0 | 345 |
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346 HeapWord* _destination; |
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347 size_t _source_region; |
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348 HeapWord* _partial_obj_addr; |
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349 region_sz_t _partial_obj_size; |
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350 region_sz_t volatile _dc_and_los; |
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351 bool _blocks_filled; |
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352 |
0 | 353 #ifdef ASSERT |
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354 size_t _blocks_filled_count; // Number of block table fills. |
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355 |
0 | 356 // These enable optimizations that are only partially implemented. Use |
357 // debug builds to prevent the code fragments from breaking. | |
375
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358 HeapWord* _data_location; |
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359 HeapWord* _highest_ref; |
0 | 360 #endif // #ifdef ASSERT |
361 | |
362 #ifdef ASSERT | |
363 public: | |
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364 uint _pushed; // 0 until region is pushed onto a stack |
0 | 365 private: |
366 #endif | |
367 }; | |
368 | |
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369 // "Blocks" allow shorter sections of the bitmap to be searched. Each Block |
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370 // holds an offset, which is the amount of live data in the Region to the left |
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371 // of the first live object that starts in the Block. |
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372 class BlockData |
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373 { |
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374 public: |
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375 typedef unsigned short int blk_ofs_t; |
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376 |
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377 blk_ofs_t offset() const { return _offset; } |
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378 void set_offset(size_t val) { _offset = (blk_ofs_t)val; } |
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379 |
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380 private: |
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381 blk_ofs_t _offset; |
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382 }; |
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383 |
0 | 384 public: |
385 ParallelCompactData(); | |
386 bool initialize(MemRegion covered_region); | |
387 | |
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388 size_t region_count() const { return _region_count; } |
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389 size_t reserved_byte_size() const { return _reserved_byte_size; } |
0 | 390 |
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391 // Convert region indices to/from RegionData pointers. |
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392 inline RegionData* region(size_t region_idx) const; |
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393 inline size_t region(const RegionData* const region_ptr) const; |
0 | 394 |
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395 size_t block_count() const { return _block_count; } |
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396 inline BlockData* block(size_t block_idx) const; |
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397 inline size_t block(const BlockData* block_ptr) const; |
0 | 398 |
399 void add_obj(HeapWord* addr, size_t len); | |
400 void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } | |
401 | |
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402 // Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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403 // destination of region n is simply the start of region n. The argument beg |
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404 // must be region-aligned; end need not be. |
0 | 405 void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
406 | |
482
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407 HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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408 HeapWord* destination, HeapWord* target_end, |
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409 HeapWord** target_next); |
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410 bool summarize(SplitInfo& split_info, |
0 | 411 HeapWord* source_beg, HeapWord* source_end, |
482
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412 HeapWord** source_next, |
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413 HeapWord* target_beg, HeapWord* target_end, |
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414 HeapWord** target_next); |
0 | 415 |
416 void clear(); | |
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417 void clear_range(size_t beg_region, size_t end_region); |
0 | 418 void clear_range(HeapWord* beg, HeapWord* end) { |
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419 clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
0 | 420 } |
421 | |
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422 // Return the number of words between addr and the start of the region |
0 | 423 // containing addr. |
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424 inline size_t region_offset(const HeapWord* addr) const; |
0 | 425 |
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426 // Convert addresses to/from a region index or region pointer. |
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427 inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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428 inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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429 inline HeapWord* region_to_addr(size_t region) const; |
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430 inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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431 inline HeapWord* region_to_addr(const RegionData* region) const; |
0 | 432 |
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433 inline HeapWord* region_align_down(HeapWord* addr) const; |
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434 inline HeapWord* region_align_up(HeapWord* addr) const; |
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435 inline bool is_region_aligned(HeapWord* addr) const; |
0 | 436 |
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437 // Analogous to region_offset() for blocks. |
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438 size_t block_offset(const HeapWord* addr) const; |
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439 size_t addr_to_block_idx(const HeapWord* addr) const; |
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440 size_t addr_to_block_idx(const oop obj) const { |
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441 return addr_to_block_idx((HeapWord*) obj); |
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442 } |
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443 inline BlockData* addr_to_block_ptr(const HeapWord* addr) const; |
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444 inline HeapWord* block_to_addr(size_t block) const; |
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445 inline size_t region_to_block_idx(size_t region) const; |
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446 |
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447 inline HeapWord* block_align_down(HeapWord* addr) const; |
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448 inline HeapWord* block_align_up(HeapWord* addr) const; |
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449 inline bool is_block_aligned(HeapWord* addr) const; |
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450 |
0 | 451 // Return the address one past the end of the partial object. |
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452 HeapWord* partial_obj_end(size_t region_idx) const; |
0 | 453 |
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454 // Return the location of the object after compaction. |
0 | 455 HeapWord* calc_new_pointer(HeapWord* addr); |
456 | |
457 HeapWord* calc_new_pointer(oop p) { | |
458 return calc_new_pointer((HeapWord*) p); | |
459 } | |
460 | |
461 #ifdef ASSERT | |
462 void verify_clear(const PSVirtualSpace* vspace); | |
463 void verify_clear(); | |
464 #endif // #ifdef ASSERT | |
465 | |
466 private: | |
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467 bool initialize_block_data(); |
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468 bool initialize_region_data(size_t region_size); |
0 | 469 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
470 | |
471 private: | |
472 HeapWord* _region_start; | |
473 #ifdef ASSERT | |
474 HeapWord* _region_end; | |
475 #endif // #ifdef ASSERT | |
476 | |
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477 PSVirtualSpace* _region_vspace; |
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478 size_t _reserved_byte_size; |
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479 RegionData* _region_data; |
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480 size_t _region_count; |
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481 |
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482 PSVirtualSpace* _block_vspace; |
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483 BlockData* _block_data; |
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484 size_t _block_count; |
0 | 485 }; |
486 | |
487 inline uint | |
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488 ParallelCompactData::RegionData::destination_count_raw() const |
0 | 489 { |
490 return _dc_and_los & dc_mask; | |
491 } | |
492 | |
493 inline uint | |
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494 ParallelCompactData::RegionData::destination_count() const |
0 | 495 { |
496 return destination_count_raw() >> dc_shift; | |
497 } | |
498 | |
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499 inline bool |
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500 ParallelCompactData::RegionData::blocks_filled() const |
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501 { |
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502 return _blocks_filled; |
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503 } |
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504 |
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505 #ifdef ASSERT |
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506 inline size_t |
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507 ParallelCompactData::RegionData::blocks_filled_count() const |
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508 { |
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509 return _blocks_filled_count; |
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510 } |
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511 #endif // #ifdef ASSERT |
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512 |
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513 inline void |
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514 ParallelCompactData::RegionData::set_blocks_filled() |
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515 { |
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516 _blocks_filled = true; |
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517 // Debug builds count the number of times the table was filled. |
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518 DEBUG_ONLY(Atomic::inc_ptr(&_blocks_filled_count)); |
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519 } |
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520 |
0 | 521 inline void |
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522 ParallelCompactData::RegionData::set_destination_count(uint count) |
0 | 523 { |
524 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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525 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
0 | 526 _dc_and_los = (count << dc_shift) | live_sz; |
527 } | |
528 | |
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529 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
0 | 530 { |
531 assert(words <= los_mask, "would overflow"); | |
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532 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
0 | 533 } |
534 | |
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535 inline void ParallelCompactData::RegionData::decrement_destination_count() |
0 | 536 { |
537 assert(_dc_and_los < dc_claimed, "already claimed"); | |
538 assert(_dc_and_los >= dc_one, "count would go negative"); | |
539 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
540 } | |
541 | |
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542 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
0 | 543 { |
544 DEBUG_ONLY(return _data_location;) | |
545 NOT_DEBUG(return NULL;) | |
546 } | |
547 | |
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548 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
0 | 549 { |
550 DEBUG_ONLY(return _highest_ref;) | |
551 NOT_DEBUG(return NULL;) | |
552 } | |
553 | |
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554 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
0 | 555 { |
556 DEBUG_ONLY(_data_location = addr;) | |
557 } | |
558 | |
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559 inline void ParallelCompactData::RegionData::set_completed() |
0 | 560 { |
561 assert(claimed(), "must be claimed first"); | |
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562 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
0 | 563 } |
564 | |
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565 // MT-unsafe claiming of a region. Should only be used during single threaded |
0 | 566 // execution. |
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567 inline bool ParallelCompactData::RegionData::claim_unsafe() |
0 | 568 { |
569 if (available()) { | |
570 _dc_and_los |= dc_claimed; | |
571 return true; | |
572 } | |
573 return false; | |
574 } | |
575 | |
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576 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
0 | 577 { |
578 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
579 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
580 } | |
581 | |
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582 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
0 | 583 { |
584 #ifdef ASSERT | |
585 HeapWord* tmp = _highest_ref; | |
586 while (addr > tmp) { | |
587 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
588 } | |
589 #endif // #ifdef ASSERT | |
590 } | |
591 | |
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592 inline bool ParallelCompactData::RegionData::claim() |
0 | 593 { |
594 const int los = (int) live_obj_size(); | |
595 const int old = Atomic::cmpxchg(dc_claimed | los, | |
596 (volatile int*) &_dc_and_los, los); | |
597 return old == los; | |
598 } | |
599 | |
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600 inline ParallelCompactData::RegionData* |
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601 ParallelCompactData::region(size_t region_idx) const |
0 | 602 { |
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603 assert(region_idx <= region_count(), "bad arg"); |
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604 return _region_data + region_idx; |
0 | 605 } |
606 | |
607 inline size_t | |
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608 ParallelCompactData::region(const RegionData* const region_ptr) const |
0 | 609 { |
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610 assert(region_ptr >= _region_data, "bad arg"); |
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611 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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612 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
0 | 613 } |
614 | |
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615 inline ParallelCompactData::BlockData* |
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616 ParallelCompactData::block(size_t n) const { |
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617 assert(n < block_count(), "bad arg"); |
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618 return _block_data + n; |
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619 } |
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620 |
0 | 621 inline size_t |
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622 ParallelCompactData::region_offset(const HeapWord* addr) const |
0 | 623 { |
624 assert(addr >= _region_start, "bad addr"); | |
625 assert(addr <= _region_end, "bad addr"); | |
375
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626 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
0 | 627 } |
628 | |
629 inline size_t | |
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630 ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
0 | 631 { |
632 assert(addr >= _region_start, "bad addr"); | |
633 assert(addr <= _region_end, "bad addr"); | |
375
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634 return pointer_delta(addr, _region_start) >> Log2RegionSize; |
0 | 635 } |
636 | |
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637 inline ParallelCompactData::RegionData* |
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638 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
0 | 639 { |
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640 return region(addr_to_region_idx(addr)); |
0 | 641 } |
642 | |
643 inline HeapWord* | |
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644 ParallelCompactData::region_to_addr(size_t region) const |
0 | 645 { |
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646 assert(region <= _region_count, "region out of range"); |
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647 return _region_start + (region << Log2RegionSize); |
0 | 648 } |
649 | |
650 inline HeapWord* | |
375
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651 ParallelCompactData::region_to_addr(const RegionData* region) const |
0 | 652 { |
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653 return region_to_addr(pointer_delta(region, _region_data, |
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654 sizeof(RegionData))); |
0 | 655 } |
656 | |
657 inline HeapWord* | |
375
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658 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
0 | 659 { |
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660 assert(region <= _region_count, "region out of range"); |
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661 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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662 return region_to_addr(region) + offset; |
0 | 663 } |
664 | |
665 inline HeapWord* | |
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666 ParallelCompactData::region_align_down(HeapWord* addr) const |
0 | 667 { |
668 assert(addr >= _region_start, "bad addr"); | |
375
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669 assert(addr < _region_end + RegionSize, "bad addr"); |
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670 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
0 | 671 } |
672 | |
673 inline HeapWord* | |
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674 ParallelCompactData::region_align_up(HeapWord* addr) const |
0 | 675 { |
676 assert(addr >= _region_start, "bad addr"); | |
677 assert(addr <= _region_end, "bad addr"); | |
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678 return region_align_down(addr + RegionSizeOffsetMask); |
0 | 679 } |
680 | |
681 inline bool | |
375
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682 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
0 | 683 { |
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684 return region_offset(addr) == 0; |
0 | 685 } |
686 | |
10369
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687 inline size_t |
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688 ParallelCompactData::block_offset(const HeapWord* addr) const |
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689 { |
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690 assert(addr >= _region_start, "bad addr"); |
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691 assert(addr <= _region_end, "bad addr"); |
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692 return (size_t(addr) & BlockAddrOffsetMask) >> LogHeapWordSize; |
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693 } |
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694 |
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695 inline size_t |
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696 ParallelCompactData::addr_to_block_idx(const HeapWord* addr) const |
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697 { |
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698 assert(addr >= _region_start, "bad addr"); |
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699 assert(addr <= _region_end, "bad addr"); |
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700 return pointer_delta(addr, _region_start) >> Log2BlockSize; |
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701 } |
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702 |
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703 inline ParallelCompactData::BlockData* |
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704 ParallelCompactData::addr_to_block_ptr(const HeapWord* addr) const |
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705 { |
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706 return block(addr_to_block_idx(addr)); |
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707 } |
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708 |
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709 inline HeapWord* |
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710 ParallelCompactData::block_to_addr(size_t block) const |
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711 { |
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712 assert(block < _block_count, "block out of range"); |
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713 return _region_start + (block << Log2BlockSize); |
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714 } |
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715 |
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716 inline size_t |
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717 ParallelCompactData::region_to_block_idx(size_t region) const |
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718 { |
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719 return region << Log2BlocksPerRegion; |
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720 } |
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721 |
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722 inline HeapWord* |
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723 ParallelCompactData::block_align_down(HeapWord* addr) const |
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724 { |
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725 assert(addr >= _region_start, "bad addr"); |
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726 assert(addr < _region_end + RegionSize, "bad addr"); |
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727 return (HeapWord*)(size_t(addr) & BlockAddrMask); |
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728 } |
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729 |
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730 inline HeapWord* |
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731 ParallelCompactData::block_align_up(HeapWord* addr) const |
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732 { |
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733 assert(addr >= _region_start, "bad addr"); |
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734 assert(addr <= _region_end, "bad addr"); |
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735 return block_align_down(addr + BlockSizeOffsetMask); |
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736 } |
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737 |
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738 inline bool |
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739 ParallelCompactData::is_block_aligned(HeapWord* addr) const |
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740 { |
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741 return block_offset(addr) == 0; |
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742 } |
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743 |
0 | 744 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the |
745 // do_addr() method. | |
746 // | |
747 // The closure is initialized with the number of heap words to process | |
748 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
749 // methods in subclasses should update the total as words are processed. Since | |
750 // only one subclass actually uses this mechanism to terminate iteration, the | |
751 // default initial value is > 0. The implementation is here and not in the | |
752 // single subclass that uses it to avoid making is_full() virtual, and thus | |
753 // adding a virtual call per live object. | |
754 | |
755 class ParMarkBitMapClosure: public StackObj { | |
756 public: | |
757 typedef ParMarkBitMap::idx_t idx_t; | |
758 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
759 | |
760 public: | |
761 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
762 size_t words = max_uintx); | |
763 | |
764 inline ParCompactionManager* compaction_manager() const; | |
765 inline ParMarkBitMap* bitmap() const; | |
766 inline size_t words_remaining() const; | |
767 inline bool is_full() const; | |
768 inline HeapWord* source() const; | |
769 | |
770 inline void set_source(HeapWord* addr); | |
771 | |
772 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
773 | |
774 protected: | |
775 inline void decrement_words_remaining(size_t words); | |
776 | |
777 private: | |
778 ParMarkBitMap* const _bitmap; | |
779 ParCompactionManager* const _compaction_manager; | |
780 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
781 size_t _words_remaining; // Words left to copy. | |
782 | |
783 protected: | |
784 HeapWord* _source; // Next addr that would be read. | |
785 }; | |
786 | |
787 inline | |
788 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
789 ParCompactionManager* cm, | |
790 size_t words): | |
791 _bitmap(bitmap), _compaction_manager(cm) | |
792 #ifdef ASSERT | |
793 , _initial_words_remaining(words) | |
794 #endif | |
795 { | |
796 _words_remaining = words; | |
797 _source = NULL; | |
798 } | |
799 | |
800 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
801 return _compaction_manager; | |
802 } | |
803 | |
804 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
805 return _bitmap; | |
806 } | |
807 | |
808 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
809 return _words_remaining; | |
810 } | |
811 | |
812 inline bool ParMarkBitMapClosure::is_full() const { | |
813 return words_remaining() == 0; | |
814 } | |
815 | |
816 inline HeapWord* ParMarkBitMapClosure::source() const { | |
817 return _source; | |
818 } | |
819 | |
820 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
821 _source = addr; | |
822 } | |
823 | |
824 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
825 assert(_words_remaining >= words, "processed too many words"); | |
826 _words_remaining -= words; | |
827 } | |
828 | |
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829 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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830 // does parts of the collection using parallel threads. The collection includes |
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831 // the tenured generation and the young generation. The permanent generation is |
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832 // collected at the same time as the other two generations but the permanent |
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833 // generation is collect by a single GC thread. The permanent generation is |
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834 // collected serially because of the requirement that during the processing of a |
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835 // klass AAA, any objects reference by AAA must already have been processed. |
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836 // This requirement is enforced by a left (lower address) to right (higher |
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837 // address) sliding compaction. |
263
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838 // |
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839 // There are four phases of the collection. |
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840 // |
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841 // - marking phase |
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842 // - summary phase |
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843 // - compacting phase |
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844 // - clean up phase |
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845 // |
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846 // Roughly speaking these phases correspond, respectively, to |
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847 // - mark all the live objects |
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848 // - calculate the destination of each object at the end of the collection |
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849 // - move the objects to their destination |
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850 // - update some references and reinitialize some variables |
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851 // |
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852 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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853 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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854 // complete marking of the heap. The summary phase is implemented in |
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855 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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856 // in PSParallelCompact::compact(). |
263
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857 // |
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858 // A space that is being collected is divided into regions and with each region |
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859 // is associated an object of type ParallelCompactData. Each region is of a |
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860 // fixed size and typically will contain more than 1 object and may have parts |
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861 // of objects at the front and back of the region. |
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862 // |
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863 // region -----+---------------------+---------- |
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864 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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865 // |
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866 // The marking phase does a complete marking of all live objects in the heap. |
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867 // The marking also compiles the size of the data for all live objects covered |
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868 // by the region. This size includes the part of any live object spanning onto |
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869 // the region (part of AAA if it is live) from the front, all live objects |
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870 // contained in the region (BBB and/or CCC if they are live), and the part of |
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871 // any live objects covered by the region that extends off the region (part of |
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872 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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873 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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874 // done atomically as is the accumulation of the size of the live objects |
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875 // covered by a region. |
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876 // |
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877 // The summary phase calculates the total live data to the left of each region |
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878 // XXX. Based on that total and the bottom of the space, it can calculate the |
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879 // starting location of the live data in XXX. The summary phase calculates for |
14909 | 880 // each region XXX quantites such as |
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881 // |
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882 // - the amount of live data at the beginning of a region from an object |
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883 // entering the region. |
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884 // - the location of the first live data on the region |
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885 // - a count of the number of regions receiving live data from XXX. |
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886 // |
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887 // See ParallelCompactData for precise details. The summary phase also |
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888 // calculates the dense prefix for the compaction. The dense prefix is a |
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889 // portion at the beginning of the space that is not moved. The objects in the |
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890 // dense prefix do need to have their object references updated. See method |
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891 // summarize_dense_prefix(). |
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892 // |
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893 // The summary phase is done using 1 GC thread. |
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894 // |
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895 // The compaction phase moves objects to their new location and updates all |
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896 // references in the object. |
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897 // |
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898 // A current exception is that objects that cross a region boundary are moved |
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899 // but do not have their references updated. References are not updated because |
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900 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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901 // has been updated. KKK likely resides in a region to the left of the region |
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902 // containing AAA. These AAA's have there references updated at the end in a |
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903 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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904 // An alternate strategy is being investigated for this deferral of updating. |
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905 // |
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906 // Compaction is done on a region basis. A region that is ready to be filled is |
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907 // put on a ready list and GC threads take region off the list and fill them. A |
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908 // region is ready to be filled if it empty of live objects. Such a region may |
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909 // have been initially empty (only contained dead objects) or may have had all |
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910 // its live objects copied out already. A region that compacts into itself is |
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911 // also ready for filling. The ready list is initially filled with empty |
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912 // regions and regions compacting into themselves. There is always at least 1 |
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913 // region that can be put on the ready list. The regions are atomically added |
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914 // and removed from the ready list. |
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915 |
0 | 916 class PSParallelCompact : AllStatic { |
917 public: | |
918 // Convenient access to type names. | |
919 typedef ParMarkBitMap::idx_t idx_t; | |
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920 typedef ParallelCompactData::RegionData RegionData; |
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921 typedef ParallelCompactData::BlockData BlockData; |
0 | 922 |
923 typedef enum { | |
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924 old_space_id, eden_space_id, |
0 | 925 from_space_id, to_space_id, last_space_id |
926 } SpaceId; | |
927 | |
928 public: | |
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929 // Inline closure decls |
0 | 930 // |
931 class IsAliveClosure: public BoolObjectClosure { | |
932 public: | |
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933 virtual bool do_object_b(oop p); |
0 | 934 }; |
935 | |
936 class KeepAliveClosure: public OopClosure { | |
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937 private: |
0 | 938 ParCompactionManager* _compaction_manager; |
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939 protected: |
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940 template <class T> inline void do_oop_work(T* p); |
0 | 941 public: |
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942 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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943 virtual void do_oop(oop* p); |
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944 virtual void do_oop(narrowOop* p); |
0 | 945 }; |
946 | |
947 class FollowStackClosure: public VoidClosure { | |
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948 private: |
0 | 949 ParCompactionManager* _compaction_manager; |
950 public: | |
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951 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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952 virtual void do_void(); |
0 | 953 }; |
954 | |
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955 class AdjustPointerClosure: public OopClosure { |
0 | 956 public: |
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957 virtual void do_oop(oop* p); |
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958 virtual void do_oop(narrowOop* p); |
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959 // do not walk from thread stacks to the code cache on this phase |
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960 virtual void do_code_blob(CodeBlob* cb) const { } |
0 | 961 }; |
962 | |
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963 class AdjustKlassClosure : public KlassClosure { |
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964 public: |
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965 void do_klass(Klass* klass); |
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966 }; |
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967 |
0 | 968 friend class KeepAliveClosure; |
969 friend class FollowStackClosure; | |
970 friend class AdjustPointerClosure; | |
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971 friend class AdjustKlassClosure; |
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972 friend class FollowKlassClosure; |
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973 friend class InstanceClassLoaderKlass; |
0 | 974 friend class RefProcTaskProxy; |
975 | |
976 private: | |
10405 | 977 static STWGCTimer _gc_timer; |
978 static ParallelOldTracer _gc_tracer; | |
0 | 979 static elapsedTimer _accumulated_time; |
980 static unsigned int _total_invocations; | |
981 static unsigned int _maximum_compaction_gc_num; | |
982 static jlong _time_of_last_gc; // ms | |
983 static CollectorCounters* _counters; | |
984 static ParMarkBitMap _mark_bitmap; | |
985 static ParallelCompactData _summary_data; | |
986 static IsAliveClosure _is_alive_closure; | |
987 static SpaceInfo _space_info[last_space_id]; | |
988 static bool _print_phases; | |
989 static AdjustPointerClosure _adjust_pointer_closure; | |
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990 static AdjustKlassClosure _adjust_klass_closure; |
0 | 991 |
992 // Reference processing (used in ...follow_contents) | |
993 static ReferenceProcessor* _ref_processor; | |
994 | |
995 // Updated location of intArrayKlassObj. | |
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996 static Klass* _updated_int_array_klass_obj; |
0 | 997 |
998 // Values computed at initialization and used by dead_wood_limiter(). | |
999 static double _dwl_mean; | |
1000 static double _dwl_std_dev; | |
1001 static double _dwl_first_term; | |
1002 static double _dwl_adjustment; | |
1003 #ifdef ASSERT | |
1004 static bool _dwl_initialized; | |
1005 #endif // #ifdef ASSERT | |
1006 | |
1007 private: | |
1008 | |
1009 static void initialize_space_info(); | |
1010 | |
1011 // Return true if details about individual phases should be printed. | |
1012 static inline bool print_phases(); | |
1013 | |
1014 // Clear the marking bitmap and summary data that cover the specified space. | |
1015 static void clear_data_covering_space(SpaceId id); | |
1016 | |
1017 static void pre_compact(PreGCValues* pre_gc_values); | |
1018 static void post_compact(); | |
1019 | |
1020 // Mark live objects | |
1021 static void marking_phase(ParCompactionManager* cm, | |
10405 | 1022 bool maximum_heap_compaction, |
1023 ParallelOldTracer *gc_tracer); | |
0 | 1024 |
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1025 template <class T> |
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1026 static inline void follow_root(ParCompactionManager* cm, T* p); |
0 | 1027 |
1028 // Compute the dense prefix for the designated space. This is an experimental | |
1029 // implementation currently not used in production. | |
1030 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
1031 bool maximum_compaction); | |
1032 | |
1033 // Methods used to compute the dense prefix. | |
1034 | |
1035 // Compute the value of the normal distribution at x = density. The mean and | |
1036 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
1037 static inline double normal_distribution(double density); | |
1038 | |
1039 // Initialize the static vars used by dead_wood_limiter(). | |
1040 static void initialize_dead_wood_limiter(); | |
1041 | |
1042 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
1043 // not reclaimed). | |
1044 static double dead_wood_limiter(double density, size_t min_percent); | |
1045 | |
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1046 // Find the first (left-most) region in the range [beg, end) that has at least |
0 | 1047 // dead_words of dead space to the left. The argument beg must be the first |
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1048 // region in the space that is not completely live. |
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1049 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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1050 const RegionData* end, |
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1051 size_t dead_words); |
0 | 1052 |
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1053 // Return a pointer to the first region in the range [beg, end) that is not |
0 | 1054 // completely full. |
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1055 static RegionData* first_dead_space_region(const RegionData* beg, |
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1056 const RegionData* end); |
0 | 1057 |
1058 // Return a value indicating the benefit or 'yield' if the compacted region | |
1059 // were to start (or equivalently if the dense prefix were to end) at the | |
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1060 // candidate region. Higher values are better. |
0 | 1061 // |
1062 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
1063 // updating references in the dense prefix plus (b) copying objects and | |
1064 // updating references in the compacted region. | |
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1065 static inline double reclaimed_ratio(const RegionData* const candidate, |
0 | 1066 HeapWord* const bottom, |
1067 HeapWord* const top, | |
1068 HeapWord* const new_top); | |
1069 | |
1070 // Compute the dense prefix for the designated space. | |
1071 static HeapWord* compute_dense_prefix(const SpaceId id, | |
1072 bool maximum_compaction); | |
1073 | |
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1074 // Return true if dead space crosses onto the specified Region; bit must be |
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1075 // the bit index corresponding to the first word of the Region. |
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1076 static inline bool dead_space_crosses_boundary(const RegionData* region, |
0 | 1077 idx_t bit); |
1078 | |
1079 // Summary phase utility routine to fill dead space (if any) at the dense | |
1080 // prefix boundary. Should only be called if the the dense prefix is | |
1081 // non-empty. | |
1082 static void fill_dense_prefix_end(SpaceId id); | |
1083 | |
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1084 // Clear the summary data source_region field for the specified addresses. |
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1085 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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1086 |
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1087 #ifndef PRODUCT |
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1088 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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1089 |
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1090 // Fill the region [start, start + words) with live object(s). Only usable |
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1091 // for the old and permanent generations. |
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1092 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1093 size_t words); |
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1094 // Include the new objects in the summary data. |
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1095 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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1096 |
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1097 // Add live objects to a survivor space since it's rare that both survivors |
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1098 // are non-empty. |
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1099 static void provoke_split_fill_survivor(SpaceId id); |
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1100 |
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1101 // Add live objects and/or choose the dense prefix to provoke splitting. |
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1102 static void provoke_split(bool & maximum_compaction); |
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1103 #endif |
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1104 |
0 | 1105 static void summarize_spaces_quick(); |
1106 static void summarize_space(SpaceId id, bool maximum_compaction); | |
1107 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
1108 | |
1109 // Adjust addresses in roots. Does not adjust addresses in heap. | |
1110 static void adjust_roots(); | |
1111 | |
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1112 DEBUG_ONLY(static void write_block_fill_histogram(outputStream* const out);) |
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1113 |
0 | 1114 // Move objects to new locations. |
1115 static void compact_perm(ParCompactionManager* cm); | |
1116 static void compact(); | |
1117 | |
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1118 // Add available regions to the stack and draining tasks to the task queue. |
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1119 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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1120 uint parallel_gc_threads); |
0 | 1121 |
1122 // Add dense prefix update tasks to the task queue. | |
1123 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
1124 uint parallel_gc_threads); | |
1125 | |
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1126 // Add region stealing tasks to the task queue. |
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1127 static void enqueue_region_stealing_tasks( |
0 | 1128 GCTaskQueue* q, |
1129 ParallelTaskTerminator* terminator_ptr, | |
1130 uint parallel_gc_threads); | |
1131 | |
1132 // If objects are left in eden after a collection, try to move the boundary | |
1133 // and absorb them into the old gen. Returns true if eden was emptied. | |
1134 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
1135 PSYoungGen* young_gen, | |
1136 PSOldGen* old_gen); | |
1137 | |
1138 // Reset time since last full gc | |
1139 static void reset_millis_since_last_gc(); | |
1140 | |
1141 public: | |
1142 class MarkAndPushClosure: public OopClosure { | |
113
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1143 private: |
0 | 1144 ParCompactionManager* _compaction_manager; |
1145 public: | |
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1146 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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1147 virtual void do_oop(oop* p); |
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1148 virtual void do_oop(narrowOop* p); |
0 | 1149 }; |
1150 | |
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1151 // The one and only place to start following the classes. |
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1152 // Should only be applied to the ClassLoaderData klasses list. |
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1153 class FollowKlassClosure : public KlassClosure { |
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1154 private: |
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1155 MarkAndPushClosure* _mark_and_push_closure; |
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1156 public: |
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1157 FollowKlassClosure(MarkAndPushClosure* mark_and_push_closure) : |
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1158 _mark_and_push_closure(mark_and_push_closure) { } |
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1159 void do_klass(Klass* klass); |
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1160 }; |
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1161 |
0 | 1162 PSParallelCompact(); |
1163 | |
1164 // Convenient accessor for Universe::heap(). | |
1165 static ParallelScavengeHeap* gc_heap() { | |
1166 return (ParallelScavengeHeap*)Universe::heap(); | |
1167 } | |
1168 | |
1169 static void invoke(bool maximum_heap_compaction); | |
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1170 static bool invoke_no_policy(bool maximum_heap_compaction); |
0 | 1171 |
1172 static void post_initialize(); | |
1173 // Perform initialization for PSParallelCompact that requires | |
1174 // allocations. This should be called during the VM initialization | |
1175 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
1176 // in the event of a failure. | |
1177 static bool initialize(); | |
1178 | |
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1179 // Closure accessors |
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1180 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
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1181 static KlassClosure* adjust_klass_closure() { return (KlassClosure*)&_adjust_klass_closure; } |
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1182 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
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1183 |
0 | 1184 // Public accessors |
1185 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
1186 static unsigned int total_invocations() { return _total_invocations; } | |
1187 static CollectorCounters* counters() { return _counters; } | |
1188 | |
1189 // Used to add tasks | |
1190 static GCTaskManager* const gc_task_manager(); | |
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1191 static Klass* updated_int_array_klass_obj() { |
0 | 1192 return _updated_int_array_klass_obj; |
1193 } | |
1194 | |
1195 // Marking support | |
1196 static inline bool mark_obj(oop obj); | |
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1197 static inline bool is_marked(oop obj); |
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1198 // Check mark and maybe push on marking stack |
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1199 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1200 T* p); |
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1201 template <class T> static inline void adjust_pointer(T* p); |
0 | 1202 |
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1203 static inline void follow_klass(ParCompactionManager* cm, Klass* klass); |
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1204 |
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1205 static void follow_class_loader(ParCompactionManager* cm, |
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1206 ClassLoaderData* klass); |
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1207 |
0 | 1208 // Compaction support. |
1209 // Return true if p is in the range [beg_addr, end_addr). | |
1210 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1211 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1212 | |
1213 // Convenience wrappers for per-space data kept in _space_info. | |
1214 static inline MutableSpace* space(SpaceId space_id); | |
1215 static inline HeapWord* new_top(SpaceId space_id); | |
1216 static inline HeapWord* dense_prefix(SpaceId space_id); | |
1217 static inline ObjectStartArray* start_array(SpaceId space_id); | |
1218 | |
1219 // Move and update the live objects in the specified space. | |
1220 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
1221 | |
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1222 // Process the end of the given region range in the dense prefix. |
0 | 1223 // This includes saving any object not updated. |
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1224 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1225 size_t region_start_index, |
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1226 size_t region_end_index, |
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1227 idx_t exiting_object_offset, |
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1228 idx_t region_offset_start, |
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1229 idx_t region_offset_end); |
0 | 1230 |
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1231 // Update a region in the dense prefix. For each live object |
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1232 // in the region, update it's interior references. For each |
0 | 1233 // dead object, fill it with deadwood. Dead space at the end |
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1234 // of a region range will be filled to the start of the next |
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1235 // live object regardless of the region_index_end. None of the |
0 | 1236 // objects in the dense prefix move and dead space is dead |
1237 // (holds only dead objects that don't need any processing), so | |
1238 // dead space can be filled in any order. | |
1239 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
1240 SpaceId space_id, | |
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1241 size_t region_index_start, |
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1242 size_t region_index_end); |
0 | 1243 |
1244 // Return the address of the count + 1st live word in the range [beg, end). | |
1245 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
1246 | |
1247 // Return the address of the word to be copied to dest_addr, which must be | |
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1248 // aligned to a region boundary. |
0 | 1249 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
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1250 SpaceId src_space_id, |
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1251 size_t src_region_idx); |
0 | 1252 |
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1253 // Determine the next source region, set closure.source() to the start of the |
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1254 // new region return the region index. Parameter end_addr is the address one |
0 | 1255 // beyond the end of source range just processed. If necessary, switch to a |
1256 // new source space and set src_space_id (in-out parameter) and src_space_top | |
1257 // (out parameter) accordingly. | |
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1258 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1259 SpaceId& src_space_id, |
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1260 HeapWord*& src_space_top, |
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1261 HeapWord* end_addr); |
0 | 1262 |
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1263 // Decrement the destination count for each non-empty source region in the |
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1264 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1265 // count for a region goes to 0 and it needs to be filled, enqueue it. |
0 | 1266 static void decrement_destination_counts(ParCompactionManager* cm, |
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1267 SpaceId src_space_id, |
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1268 size_t beg_region, |
0 | 1269 HeapWord* end_addr); |
1270 | |
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1271 // Fill a region, copying objects from one or more source regions. |
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1272 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1273 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1274 fill_region(cm, region); |
0 | 1275 } |
1276 | |
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1277 // Fill in the block table for the specified region. |
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1278 static void fill_blocks(size_t region_idx); |
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1279 |
0 | 1280 // Update the deferred objects in the space. |
1281 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
1282 | |
1283 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
1284 static ParallelCompactData& summary_data() { return _summary_data; } | |
1285 | |
1286 // Reference Processing | |
1287 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
1288 | |
10405 | 1289 static STWGCTimer* gc_timer() { return &_gc_timer; } |
1290 | |
0 | 1291 // Return the SpaceId for the given address. |
1292 static SpaceId space_id(HeapWord* addr); | |
1293 | |
1294 // Time since last full gc (in milliseconds). | |
1295 static jlong millis_since_last_gc(); | |
1296 | |
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1297 static void print_on_error(outputStream* st); |
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1298 |
0 | 1299 #ifndef PRODUCT |
1300 // Debugging support. | |
1301 static const char* space_names[last_space_id]; | |
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1302 static void print_region_ranges(); |
0 | 1303 static void print_dense_prefix_stats(const char* const algorithm, |
1304 const SpaceId id, | |
1305 const bool maximum_compaction, | |
1306 HeapWord* const addr); | |
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1307 static void summary_phase_msg(SpaceId dst_space_id, |
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1308 HeapWord* dst_beg, HeapWord* dst_end, |
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1309 SpaceId src_space_id, |
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1310 HeapWord* src_beg, HeapWord* src_end); |
0 | 1311 #endif // #ifndef PRODUCT |
1312 | |
1313 #ifdef ASSERT | |
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1314 // Sanity check the new location of a word in the heap. |
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1315 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1316 // Verify that all the regions have been emptied. |
0 | 1317 static void verify_complete(SpaceId space_id); |
1318 #endif // #ifdef ASSERT | |
1319 }; | |
1320 | |
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1321 inline bool PSParallelCompact::mark_obj(oop obj) { |
0 | 1322 const int obj_size = obj->size(); |
1323 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
1324 _summary_data.add_obj(obj, obj_size); | |
1325 return true; | |
1326 } else { | |
1327 return false; | |
1328 } | |
1329 } | |
1330 | |
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1331 inline bool PSParallelCompact::is_marked(oop obj) { |
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1332 return mark_bitmap()->is_marked(obj); |
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1333 } |
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1334 |
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1335 template <class T> |
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1336 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1337 assert(!Universe::heap()->is_in_reserved(p), |
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1338 "roots shouldn't be things within the heap"); |
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1339 |
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1340 T heap_oop = oopDesc::load_heap_oop(p); |
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1341 if (!oopDesc::is_null(heap_oop)) { |
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1342 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1343 if (mark_bitmap()->is_unmarked(obj)) { |
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1344 if (mark_obj(obj)) { |
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1345 obj->follow_contents(cm); |
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1346 } |
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1347 } |
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1348 } |
1311
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1349 cm->follow_marking_stacks(); |
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1350 } |
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1351 |
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1352 template <class T> |
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1353 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1354 T heap_oop = oopDesc::load_heap_oop(p); |
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1355 if (!oopDesc::is_null(heap_oop)) { |
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1356 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
1638 | 1357 if (mark_bitmap()->is_unmarked(obj) && mark_obj(obj)) { |
1358 cm->push(obj); | |
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1359 } |
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1360 } |
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1361 } |
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1362 |
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1363 template <class T> |
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1364 inline void PSParallelCompact::adjust_pointer(T* p) { |
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1365 T heap_oop = oopDesc::load_heap_oop(p); |
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1366 if (!oopDesc::is_null(heap_oop)) { |
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1367 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1368 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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1369 assert(new_obj != NULL, // is forwarding ptr? |
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1370 "should be forwarded"); |
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1371 // Just always do the update unconditionally? |
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1372 if (new_obj != NULL) { |
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1373 assert(Universe::heap()->is_in_reserved(new_obj), |
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1374 "should be in object space"); |
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1375 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1376 } |
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1377 } |
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1378 } |
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1379 |
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1380 inline void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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1381 oop holder = klass->klass_holder(); |
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1382 PSParallelCompact::mark_and_push(cm, &holder); |
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1383 } |
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1384 |
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1385 template <class T> |
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1386 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1387 mark_and_push(_compaction_manager, p); |
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1388 } |
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1389 |
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1390 inline bool PSParallelCompact::print_phases() { |
0 | 1391 return _print_phases; |
1392 } | |
1393 | |
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1394 inline double PSParallelCompact::normal_distribution(double density) { |
0 | 1395 assert(_dwl_initialized, "uninitialized"); |
1396 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
1397 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
1398 } | |
1399 | |
1400 inline bool | |
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1401 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
0 | 1402 idx_t bit) |
1403 { | |
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1404 assert(bit > 0, "cannot call this for the first bit/region"); |
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1405 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
0 | 1406 "sanity check"); |
1407 | |
1408 // Dead space crosses the boundary if (1) a partial object does not extend | |
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1409 // onto the region, (2) an object does not start at the beginning of the |
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1410 // region, and (3) an object does not end at the end of the prior region. |
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1411 return region->partial_obj_size() == 0 && |
0 | 1412 !_mark_bitmap.is_obj_beg(bit) && |
1413 !_mark_bitmap.is_obj_end(bit - 1); | |
1414 } | |
1415 | |
1416 inline bool | |
1417 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1418 return p >= beg_addr && p < end_addr; | |
1419 } | |
1420 | |
1421 inline bool | |
1422 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1423 return is_in((HeapWord*)p, beg_addr, end_addr); | |
1424 } | |
1425 | |
1426 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
1427 assert(id < last_space_id, "id out of range"); | |
1428 return _space_info[id].space(); | |
1429 } | |
1430 | |
1431 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
1432 assert(id < last_space_id, "id out of range"); | |
1433 return _space_info[id].new_top(); | |
1434 } | |
1435 | |
1436 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
1437 assert(id < last_space_id, "id out of range"); | |
1438 return _space_info[id].dense_prefix(); | |
1439 } | |
1440 | |
1441 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
1442 assert(id < last_space_id, "id out of range"); | |
1443 return _space_info[id].start_array(); | |
1444 } | |
1445 | |
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1446 #ifdef ASSERT |
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1447 inline void |
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1448 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1449 { |
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1450 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1451 "must move left or to a different space"); |
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1452 assert(is_object_aligned((intptr_t)old_addr) && is_object_aligned((intptr_t)new_addr), |
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1453 "checking alignment"); |
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1454 } |
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1455 #endif // ASSERT |
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1456 |
0 | 1457 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
1458 public: | |
1459 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
1460 ObjectStartArray* start_array, | |
1461 HeapWord* destination, size_t words); | |
1462 | |
1463 // Accessors. | |
1464 HeapWord* destination() const { return _destination; } | |
1465 | |
1466 // If the object will fit (size <= words_remaining()), copy it to the current | |
1467 // destination, update the interior oops and the start array and return either | |
1468 // full (if the closure is full) or incomplete. If the object will not fit, | |
1469 // return would_overflow. | |
1470 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
1471 | |
1472 // Copy enough words to fill this closure, starting at source(). Interior | |
1473 // oops and the start array are not updated. Return full. | |
1474 IterationStatus copy_until_full(); | |
1475 | |
1476 // Copy enough words to fill this closure or to the end of an object, | |
1477 // whichever is smaller, starting at source(). Interior oops and the start | |
1478 // array are not updated. | |
1479 void copy_partial_obj(); | |
1480 | |
1481 protected: | |
1482 // Update variables to indicate that word_count words were processed. | |
1483 inline void update_state(size_t word_count); | |
1484 | |
1485 protected: | |
1486 ObjectStartArray* const _start_array; | |
1487 HeapWord* _destination; // Next addr to be written. | |
1488 }; | |
1489 | |
1490 inline | |
1491 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
1492 ParCompactionManager* cm, | |
1493 ObjectStartArray* start_array, | |
1494 HeapWord* destination, | |
1495 size_t words) : | |
1496 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
1497 { | |
1498 _destination = destination; | |
1499 } | |
1500 | |
1501 inline void MoveAndUpdateClosure::update_state(size_t words) | |
1502 { | |
1503 decrement_words_remaining(words); | |
1504 _source += words; | |
1505 _destination += words; | |
1506 } | |
1507 | |
1508 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
1509 private: | |
1510 const PSParallelCompact::SpaceId _space_id; | |
1511 ObjectStartArray* const _start_array; | |
1512 | |
1513 public: | |
1514 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
1515 ParCompactionManager* cm, | |
1516 PSParallelCompact::SpaceId space_id); | |
1517 | |
1518 // Update the object. | |
1519 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
1520 | |
1521 inline void do_addr(HeapWord* addr); | |
1522 }; | |
1523 | |
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1524 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1525 { |
0 | 1526 _start_array->allocate_block(addr); |
1527 oop(addr)->update_contents(compaction_manager()); | |
1528 } | |
1529 | |
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1530 class FillClosure: public ParMarkBitMapClosure |
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1531 { |
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1532 public: |
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1533 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
0 | 1534 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
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1535 _start_array(PSParallelCompact::start_array(space_id)) |
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1536 { |
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1537 assert(space_id == PSParallelCompact::old_space_id, |
0 | 1538 "cannot use FillClosure in the young gen"); |
1539 } | |
1540 | |
1541 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
481
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1542 CollectedHeap::fill_with_objects(addr, size); |
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1543 HeapWord* const end = addr + size; |
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1544 do { |
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1545 _start_array->allocate_block(addr); |
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1546 addr += oop(addr)->size(); |
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1547 } while (addr < end); |
0 | 1548 return ParMarkBitMap::incomplete; |
1549 } | |
1550 | |
1551 private: | |
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1552 ObjectStartArray* const _start_array; |
0 | 1553 }; |
1972 | 1554 |
1555 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |