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annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | b2a00dd3117c |
| children | e5383553fd4e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1638 | 2 * Copyright (c) 2005, 2010, 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 PSPermGen; | |
| 42 class ParCompactionManager; | |
| 43 class ParallelTaskTerminator; | |
| 44 class PSParallelCompact; | |
| 45 class GCTaskManager; | |
| 46 class GCTaskQueue; | |
| 47 class PreGCValues; | |
| 48 class MoveAndUpdateClosure; | |
| 49 class RefProcTaskExecutor; | |
| 50 | |
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51 // The SplitInfo class holds the information needed to 'split' a source region |
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52 // so that the live data can be copied to two destination *spaces*. Normally, |
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53 // all the live data in a region is copied to a single destination space (e.g., |
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54 // everything live in a region in eden is copied entirely into the old gen). |
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55 // However, when the heap is nearly full, all the live data in eden may not fit |
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56 // into the old gen. Copying only some of the regions from eden to old gen |
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57 // requires finding a region that does not contain a partial object (i.e., no |
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58 // live object crosses the region boundary) somewhere near the last object that |
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59 // does fit into the old gen. Since it's not always possible to find such a |
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60 // region, splitting is necessary for predictable behavior. |
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61 // |
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62 // A region is always split at the end of the partial object. This avoids |
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63 // additional tests when calculating the new location of a pointer, which is a |
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64 // very hot code path. The partial object and everything to its left will be |
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65 // copied to another space (call it dest_space_1). The live data to the right |
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66 // of the partial object will be copied either within the space itself, or to a |
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67 // different destination space (distinct from dest_space_1). |
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68 // |
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69 // Split points are identified during the summary phase, when region |
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70 // destinations are computed: data about the split, including the |
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71 // partial_object_size, is recorded in a SplitInfo record and the |
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72 // partial_object_size field in the summary data is set to zero. The zeroing is |
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73 // possible (and necessary) since the partial object will move to a different |
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74 // destination space than anything to its right, thus the partial object should |
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75 // not affect the locations of any objects to its right. |
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76 // |
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77 // The recorded data is used during the compaction phase, but only rarely: when |
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78 // the partial object on the split region will be copied across a destination |
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79 // region boundary. This test is made once each time a region is filled, and is |
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80 // a simple address comparison, so the overhead is negligible (see |
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81 // PSParallelCompact::first_src_addr()). |
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82 // |
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83 // Notes: |
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84 // |
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85 // Only regions with partial objects are split; a region without a partial |
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86 // object does not need any extra bookkeeping. |
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87 // |
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88 // At most one region is split per space, so the amount of data required is |
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89 // constant. |
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90 // |
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91 // A region is split only when the destination space would overflow. Once that |
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92 // happens, the destination space is abandoned and no other data (even from |
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93 // other source spaces) is targeted to that destination space. Abandoning the |
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94 // destination space may leave a somewhat large unused area at the end, if a |
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95 // large object caused the overflow. |
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96 // |
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97 // Future work: |
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98 // |
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99 // More bookkeeping would be required to continue to use the destination space. |
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100 // The most general solution would allow data from regions in two different |
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101 // source spaces to be "joined" in a single destination region. At the very |
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102 // least, additional code would be required in next_src_region() to detect the |
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103 // join and skip to an out-of-order source region. If the join region was also |
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104 // the last destination region to which a split region was copied (the most |
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105 // likely case), then additional work would be needed to get fill_region() to |
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106 // stop iteration and switch to a new source region at the right point. Basic |
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107 // idea would be to use a fake value for the top of the source space. It is |
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108 // doable, if a bit tricky. |
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109 // |
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110 // A simpler (but less general) solution would fill the remainder of the |
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111 // destination region with a dummy object and continue filling the next |
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112 // destination region. |
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113 |
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114 class SplitInfo |
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115 { |
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116 public: |
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117 // Return true if this split info is valid (i.e., if a split has been |
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118 // recorded). The very first region cannot have a partial object and thus is |
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119 // never split, so 0 is the 'invalid' value. |
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120 bool is_valid() const { return _src_region_idx > 0; } |
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121 |
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122 // Return true if this split holds data for the specified source region. |
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123 inline bool is_split(size_t source_region) const; |
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124 |
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125 // The index of the split region, the size of the partial object on that |
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126 // region and the destination of the partial object. |
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127 size_t src_region_idx() const { return _src_region_idx; } |
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128 size_t partial_obj_size() const { return _partial_obj_size; } |
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129 HeapWord* destination() const { return _destination; } |
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130 |
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131 // The destination count of the partial object referenced by this split |
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132 // (either 1 or 2). This must be added to the destination count of the |
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133 // remainder of the source region. |
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134 unsigned int destination_count() const { return _destination_count; } |
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135 |
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136 // If a word within the partial object will be written to the first word of a |
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137 // destination region, this is the address of the destination region; |
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138 // otherwise this is NULL. |
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139 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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140 |
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141 // If a word within the partial object will be written to the first word of a |
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142 // destination region, this is the address of that word within the partial |
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143 // object; otherwise this is NULL. |
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144 HeapWord* first_src_addr() const { return _first_src_addr; } |
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145 |
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146 // Record the data necessary to split the region src_region_idx. |
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147 void record(size_t src_region_idx, size_t partial_obj_size, |
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148 HeapWord* destination); |
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149 |
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150 void clear(); |
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151 |
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152 DEBUG_ONLY(void verify_clear();) |
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153 |
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154 private: |
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155 size_t _src_region_idx; |
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156 size_t _partial_obj_size; |
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157 HeapWord* _destination; |
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158 unsigned int _destination_count; |
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159 HeapWord* _dest_region_addr; |
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160 HeapWord* _first_src_addr; |
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161 }; |
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162 |
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163 inline bool SplitInfo::is_split(size_t region_idx) const |
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164 { |
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165 return _src_region_idx == region_idx && is_valid(); |
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166 } |
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167 |
| 0 | 168 class SpaceInfo |
| 169 { | |
| 170 public: | |
| 171 MutableSpace* space() const { return _space; } | |
| 172 | |
| 173 // Where the free space will start after the collection. Valid only after the | |
| 174 // summary phase completes. | |
| 175 HeapWord* new_top() const { return _new_top; } | |
| 176 | |
| 177 // Allows new_top to be set. | |
| 178 HeapWord** new_top_addr() { return &_new_top; } | |
| 179 | |
| 180 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
| 181 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
| 182 | |
| 183 // Where the dense prefix ends, or the compacted region begins. | |
| 184 HeapWord* dense_prefix() const { return _dense_prefix; } | |
| 185 | |
| 186 // The start array for the (generation containing the) space, or NULL if there | |
| 187 // is no start array. | |
| 188 ObjectStartArray* start_array() const { return _start_array; } | |
| 189 | |
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190 SplitInfo& split_info() { return _split_info; } |
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191 |
| 0 | 192 void set_space(MutableSpace* s) { _space = s; } |
| 193 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
| 194 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
| 195 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
| 196 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
| 197 | |
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198 void publish_new_top() const { _space->set_top(_new_top); } |
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199 |
| 0 | 200 private: |
| 201 MutableSpace* _space; | |
| 202 HeapWord* _new_top; | |
| 203 HeapWord* _min_dense_prefix; | |
| 204 HeapWord* _dense_prefix; | |
| 205 ObjectStartArray* _start_array; | |
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206 SplitInfo _split_info; |
| 0 | 207 }; |
| 208 | |
| 209 class ParallelCompactData | |
| 210 { | |
| 211 public: | |
| 212 // Sizes are in HeapWords, unless indicated otherwise. | |
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213 static const size_t Log2RegionSize; |
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214 static const size_t RegionSize; |
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215 static const size_t RegionSizeBytes; |
| 0 | 216 |
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217 // Mask for the bits in a size_t to get an offset within a region. |
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218 static const size_t RegionSizeOffsetMask; |
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219 // Mask for the bits in a pointer to get an offset within a region. |
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220 static const size_t RegionAddrOffsetMask; |
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221 // Mask for the bits in a pointer to get the address of the start of a region. |
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222 static const size_t RegionAddrMask; |
| 0 | 223 |
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224 class RegionData |
| 0 | 225 { |
| 226 public: | |
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227 // Destination address of the region. |
| 0 | 228 HeapWord* destination() const { return _destination; } |
| 229 | |
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230 // The first region containing data destined for this region. |
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231 size_t source_region() const { return _source_region; } |
| 0 | 232 |
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233 // The object (if any) starting in this region and ending in a different |
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234 // region that could not be updated during the main (parallel) compaction |
| 0 | 235 // phase. This is different from _partial_obj_addr, which is an object that |
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236 // extends onto a source region. However, the two uses do not overlap in |
| 0 | 237 // time, so the same field is used to save space. |
| 238 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
| 239 | |
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240 // The starting address of the partial object extending onto the region. |
| 0 | 241 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
| 242 | |
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243 // Size of the partial object extending onto the region (words). |
| 0 | 244 size_t partial_obj_size() const { return _partial_obj_size; } |
| 245 | |
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246 // Size of live data that lies within this region due to objects that start |
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247 // in this region (words). This does not include the partial object |
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248 // extending onto the region (if any), or the part of an object that extends |
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249 // onto the next region (if any). |
| 0 | 250 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
| 251 | |
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252 // Total live data that lies within the region (words). |
| 0 | 253 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
| 254 | |
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255 // The destination_count is the number of other regions to which data from |
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256 // this region will be copied. At the end of the summary phase, the valid |
| 0 | 257 // values of destination_count are |
| 258 // | |
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259 // 0 - data from the region will be compacted completely into itself, or the |
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260 // region is empty. The region can be claimed and then filled. |
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261 // 1 - data from the region will be compacted into 1 other region; some |
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262 // data from the region may also be compacted into the region itself. |
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263 // 2 - data from the region will be copied to 2 other regions. |
| 0 | 264 // |
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265 // During compaction as regions are emptied, the destination_count is |
| 0 | 266 // decremented (atomically) and when it reaches 0, it can be claimed and |
| 267 // then filled. | |
| 268 // | |
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269 // A region is claimed for processing by atomically changing the |
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270 // destination_count to the claimed value (dc_claimed). After a region has |
| 0 | 271 // been filled, the destination_count should be set to the completed value |
| 272 // (dc_completed). | |
| 273 inline uint destination_count() const; | |
| 274 inline uint destination_count_raw() const; | |
| 275 | |
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276 // The location of the java heap data that corresponds to this region. |
| 0 | 277 inline HeapWord* data_location() const; |
| 278 | |
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279 // The highest address referenced by objects in this region. |
| 0 | 280 inline HeapWord* highest_ref() const; |
| 281 | |
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282 // Whether this region is available to be claimed, has been claimed, or has |
| 0 | 283 // been completed. |
| 284 // | |
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285 // Minor subtlety: claimed() returns true if the region is marked |
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286 // completed(), which is desirable since a region must be claimed before it |
| 0 | 287 // can be completed. |
| 288 bool available() const { return _dc_and_los < dc_one; } | |
| 289 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
| 290 bool completed() const { return _dc_and_los >= dc_completed; } | |
| 291 | |
| 292 // These are not atomic. | |
| 293 void set_destination(HeapWord* addr) { _destination = addr; } | |
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294 void set_source_region(size_t region) { _source_region = region; } |
| 0 | 295 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
| 296 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
| 297 void set_partial_obj_size(size_t words) { | |
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298 _partial_obj_size = (region_sz_t) words; |
| 0 | 299 } |
| 300 | |
| 301 inline void set_destination_count(uint count); | |
| 302 inline void set_live_obj_size(size_t words); | |
| 303 inline void set_data_location(HeapWord* addr); | |
| 304 inline void set_completed(); | |
| 305 inline bool claim_unsafe(); | |
| 306 | |
| 307 // These are atomic. | |
| 308 inline void add_live_obj(size_t words); | |
| 309 inline void set_highest_ref(HeapWord* addr); | |
| 310 inline void decrement_destination_count(); | |
| 311 inline bool claim(); | |
| 312 | |
| 313 private: | |
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314 // The type used to represent object sizes within a region. |
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315 typedef uint region_sz_t; |
| 0 | 316 |
| 317 // Constants for manipulating the _dc_and_los field, which holds both the | |
| 318 // destination count and live obj size. The live obj size lives at the | |
| 319 // least significant end so no masking is necessary when adding. | |
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320 static const region_sz_t dc_shift; // Shift amount. |
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321 static const region_sz_t dc_mask; // Mask for destination count. |
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322 static const region_sz_t dc_one; // 1, shifted appropriately. |
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323 static const region_sz_t dc_claimed; // Region has been claimed. |
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324 static const region_sz_t dc_completed; // Region has been completed. |
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325 static const region_sz_t los_mask; // Mask for live obj size. |
| 0 | 326 |
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327 HeapWord* _destination; |
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328 size_t _source_region; |
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329 HeapWord* _partial_obj_addr; |
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330 region_sz_t _partial_obj_size; |
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331 region_sz_t volatile _dc_and_los; |
| 0 | 332 #ifdef ASSERT |
| 333 // These enable optimizations that are only partially implemented. Use | |
| 334 // debug builds to prevent the code fragments from breaking. | |
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335 HeapWord* _data_location; |
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336 HeapWord* _highest_ref; |
| 0 | 337 #endif // #ifdef ASSERT |
| 338 | |
| 339 #ifdef ASSERT | |
| 340 public: | |
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341 uint _pushed; // 0 until region is pushed onto a worker's stack |
| 0 | 342 private: |
| 343 #endif | |
| 344 }; | |
| 345 | |
| 346 public: | |
| 347 ParallelCompactData(); | |
| 348 bool initialize(MemRegion covered_region); | |
| 349 | |
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350 size_t region_count() const { return _region_count; } |
| 0 | 351 |
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352 // Convert region indices to/from RegionData pointers. |
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353 inline RegionData* region(size_t region_idx) const; |
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354 inline size_t region(const RegionData* const region_ptr) const; |
| 0 | 355 |
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356 // Returns true if the given address is contained within the region |
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357 bool region_contains(size_t region_index, HeapWord* addr); |
| 0 | 358 |
| 359 void add_obj(HeapWord* addr, size_t len); | |
| 360 void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } | |
| 361 | |
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362 // Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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363 // destination of region n is simply the start of region n. The argument beg |
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364 // must be region-aligned; end need not be. |
| 0 | 365 void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
| 366 | |
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367 HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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368 HeapWord* destination, HeapWord* target_end, |
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369 HeapWord** target_next); |
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370 bool summarize(SplitInfo& split_info, |
| 0 | 371 HeapWord* source_beg, HeapWord* source_end, |
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372 HeapWord** source_next, |
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373 HeapWord* target_beg, HeapWord* target_end, |
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374 HeapWord** target_next); |
| 0 | 375 |
| 376 void clear(); | |
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377 void clear_range(size_t beg_region, size_t end_region); |
| 0 | 378 void clear_range(HeapWord* beg, HeapWord* end) { |
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379 clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
| 0 | 380 } |
| 381 | |
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382 // Return the number of words between addr and the start of the region |
| 0 | 383 // containing addr. |
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384 inline size_t region_offset(const HeapWord* addr) const; |
| 0 | 385 |
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386 // Convert addresses to/from a region index or region pointer. |
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387 inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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388 inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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389 inline HeapWord* region_to_addr(size_t region) const; |
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390 inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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391 inline HeapWord* region_to_addr(const RegionData* region) const; |
| 0 | 392 |
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393 inline HeapWord* region_align_down(HeapWord* addr) const; |
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394 inline HeapWord* region_align_up(HeapWord* addr) const; |
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395 inline bool is_region_aligned(HeapWord* addr) const; |
| 0 | 396 |
| 397 // Return the address one past the end of the partial object. | |
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398 HeapWord* partial_obj_end(size_t region_idx) const; |
| 0 | 399 |
| 400 // Return the new location of the object p after the | |
| 401 // the compaction. | |
| 402 HeapWord* calc_new_pointer(HeapWord* addr); | |
| 403 | |
| 404 HeapWord* calc_new_pointer(oop p) { | |
| 405 return calc_new_pointer((HeapWord*) p); | |
| 406 } | |
| 407 | |
| 408 // Return the updated address for the given klass | |
| 409 klassOop calc_new_klass(klassOop); | |
| 410 | |
| 411 #ifdef ASSERT | |
| 412 void verify_clear(const PSVirtualSpace* vspace); | |
| 413 void verify_clear(); | |
| 414 #endif // #ifdef ASSERT | |
| 415 | |
| 416 private: | |
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417 bool initialize_region_data(size_t region_size); |
| 0 | 418 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
| 419 | |
| 420 private: | |
| 421 HeapWord* _region_start; | |
| 422 #ifdef ASSERT | |
| 423 HeapWord* _region_end; | |
| 424 #endif // #ifdef ASSERT | |
| 425 | |
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426 PSVirtualSpace* _region_vspace; |
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427 RegionData* _region_data; |
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428 size_t _region_count; |
| 0 | 429 }; |
| 430 | |
| 431 inline uint | |
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432 ParallelCompactData::RegionData::destination_count_raw() const |
| 0 | 433 { |
| 434 return _dc_and_los & dc_mask; | |
| 435 } | |
| 436 | |
| 437 inline uint | |
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438 ParallelCompactData::RegionData::destination_count() const |
| 0 | 439 { |
| 440 return destination_count_raw() >> dc_shift; | |
| 441 } | |
| 442 | |
| 443 inline void | |
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444 ParallelCompactData::RegionData::set_destination_count(uint count) |
| 0 | 445 { |
| 446 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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447 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
| 0 | 448 _dc_and_los = (count << dc_shift) | live_sz; |
| 449 } | |
| 450 | |
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451 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
| 0 | 452 { |
| 453 assert(words <= los_mask, "would overflow"); | |
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454 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
| 0 | 455 } |
| 456 | |
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457 inline void ParallelCompactData::RegionData::decrement_destination_count() |
| 0 | 458 { |
| 459 assert(_dc_and_los < dc_claimed, "already claimed"); | |
| 460 assert(_dc_and_los >= dc_one, "count would go negative"); | |
| 461 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
| 462 } | |
| 463 | |
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464 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
| 0 | 465 { |
| 466 DEBUG_ONLY(return _data_location;) | |
| 467 NOT_DEBUG(return NULL;) | |
| 468 } | |
| 469 | |
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470 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
| 0 | 471 { |
| 472 DEBUG_ONLY(return _highest_ref;) | |
| 473 NOT_DEBUG(return NULL;) | |
| 474 } | |
| 475 | |
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476 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
| 0 | 477 { |
| 478 DEBUG_ONLY(_data_location = addr;) | |
| 479 } | |
| 480 | |
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481 inline void ParallelCompactData::RegionData::set_completed() |
| 0 | 482 { |
| 483 assert(claimed(), "must be claimed first"); | |
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484 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
| 0 | 485 } |
| 486 | |
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487 // MT-unsafe claiming of a region. Should only be used during single threaded |
| 0 | 488 // execution. |
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489 inline bool ParallelCompactData::RegionData::claim_unsafe() |
| 0 | 490 { |
| 491 if (available()) { | |
| 492 _dc_and_los |= dc_claimed; | |
| 493 return true; | |
| 494 } | |
| 495 return false; | |
| 496 } | |
| 497 | |
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498 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
| 0 | 499 { |
| 500 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
| 501 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
| 502 } | |
| 503 | |
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504 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
| 0 | 505 { |
| 506 #ifdef ASSERT | |
| 507 HeapWord* tmp = _highest_ref; | |
| 508 while (addr > tmp) { | |
| 509 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
| 510 } | |
| 511 #endif // #ifdef ASSERT | |
| 512 } | |
| 513 | |
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514 inline bool ParallelCompactData::RegionData::claim() |
| 0 | 515 { |
| 516 const int los = (int) live_obj_size(); | |
| 517 const int old = Atomic::cmpxchg(dc_claimed | los, | |
| 518 (volatile int*) &_dc_and_los, los); | |
| 519 return old == los; | |
| 520 } | |
| 521 | |
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522 inline ParallelCompactData::RegionData* |
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523 ParallelCompactData::region(size_t region_idx) const |
| 0 | 524 { |
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525 assert(region_idx <= region_count(), "bad arg"); |
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526 return _region_data + region_idx; |
| 0 | 527 } |
| 528 | |
| 529 inline size_t | |
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530 ParallelCompactData::region(const RegionData* const region_ptr) const |
| 0 | 531 { |
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532 assert(region_ptr >= _region_data, "bad arg"); |
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533 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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534 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
| 0 | 535 } |
| 536 | |
| 537 inline size_t | |
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538 ParallelCompactData::region_offset(const HeapWord* addr) const |
| 0 | 539 { |
| 540 assert(addr >= _region_start, "bad addr"); | |
| 541 assert(addr <= _region_end, "bad addr"); | |
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542 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
| 0 | 543 } |
| 544 | |
| 545 inline size_t | |
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546 ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
| 0 | 547 { |
| 548 assert(addr >= _region_start, "bad addr"); | |
| 549 assert(addr <= _region_end, "bad addr"); | |
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550 return pointer_delta(addr, _region_start) >> Log2RegionSize; |
| 0 | 551 } |
| 552 | |
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553 inline ParallelCompactData::RegionData* |
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554 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
| 0 | 555 { |
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556 return region(addr_to_region_idx(addr)); |
| 0 | 557 } |
| 558 | |
| 559 inline HeapWord* | |
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560 ParallelCompactData::region_to_addr(size_t region) const |
| 0 | 561 { |
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562 assert(region <= _region_count, "region out of range"); |
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563 return _region_start + (region << Log2RegionSize); |
| 0 | 564 } |
| 565 | |
| 566 inline HeapWord* | |
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567 ParallelCompactData::region_to_addr(const RegionData* region) const |
| 0 | 568 { |
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569 return region_to_addr(pointer_delta(region, _region_data, |
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570 sizeof(RegionData))); |
| 0 | 571 } |
| 572 | |
| 573 inline HeapWord* | |
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574 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
| 0 | 575 { |
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576 assert(region <= _region_count, "region out of range"); |
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577 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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578 return region_to_addr(region) + offset; |
| 0 | 579 } |
| 580 | |
| 581 inline HeapWord* | |
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582 ParallelCompactData::region_align_down(HeapWord* addr) const |
| 0 | 583 { |
| 584 assert(addr >= _region_start, "bad addr"); | |
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585 assert(addr < _region_end + RegionSize, "bad addr"); |
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586 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
| 0 | 587 } |
| 588 | |
| 589 inline HeapWord* | |
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590 ParallelCompactData::region_align_up(HeapWord* addr) const |
| 0 | 591 { |
| 592 assert(addr >= _region_start, "bad addr"); | |
| 593 assert(addr <= _region_end, "bad addr"); | |
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594 return region_align_down(addr + RegionSizeOffsetMask); |
| 0 | 595 } |
| 596 | |
| 597 inline bool | |
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598 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
| 0 | 599 { |
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600 return region_offset(addr) == 0; |
| 0 | 601 } |
| 602 | |
| 603 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the | |
| 604 // do_addr() method. | |
| 605 // | |
| 606 // The closure is initialized with the number of heap words to process | |
| 607 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
| 608 // methods in subclasses should update the total as words are processed. Since | |
| 609 // only one subclass actually uses this mechanism to terminate iteration, the | |
| 610 // default initial value is > 0. The implementation is here and not in the | |
| 611 // single subclass that uses it to avoid making is_full() virtual, and thus | |
| 612 // adding a virtual call per live object. | |
| 613 | |
| 614 class ParMarkBitMapClosure: public StackObj { | |
| 615 public: | |
| 616 typedef ParMarkBitMap::idx_t idx_t; | |
| 617 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
| 618 | |
| 619 public: | |
| 620 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
| 621 size_t words = max_uintx); | |
| 622 | |
| 623 inline ParCompactionManager* compaction_manager() const; | |
| 624 inline ParMarkBitMap* bitmap() const; | |
| 625 inline size_t words_remaining() const; | |
| 626 inline bool is_full() const; | |
| 627 inline HeapWord* source() const; | |
| 628 | |
| 629 inline void set_source(HeapWord* addr); | |
| 630 | |
| 631 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
| 632 | |
| 633 protected: | |
| 634 inline void decrement_words_remaining(size_t words); | |
| 635 | |
| 636 private: | |
| 637 ParMarkBitMap* const _bitmap; | |
| 638 ParCompactionManager* const _compaction_manager; | |
| 639 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
| 640 size_t _words_remaining; // Words left to copy. | |
| 641 | |
| 642 protected: | |
| 643 HeapWord* _source; // Next addr that would be read. | |
| 644 }; | |
| 645 | |
| 646 inline | |
| 647 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
| 648 ParCompactionManager* cm, | |
| 649 size_t words): | |
| 650 _bitmap(bitmap), _compaction_manager(cm) | |
| 651 #ifdef ASSERT | |
| 652 , _initial_words_remaining(words) | |
| 653 #endif | |
| 654 { | |
| 655 _words_remaining = words; | |
| 656 _source = NULL; | |
| 657 } | |
| 658 | |
| 659 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
| 660 return _compaction_manager; | |
| 661 } | |
| 662 | |
| 663 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
| 664 return _bitmap; | |
| 665 } | |
| 666 | |
| 667 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
| 668 return _words_remaining; | |
| 669 } | |
| 670 | |
| 671 inline bool ParMarkBitMapClosure::is_full() const { | |
| 672 return words_remaining() == 0; | |
| 673 } | |
| 674 | |
| 675 inline HeapWord* ParMarkBitMapClosure::source() const { | |
| 676 return _source; | |
| 677 } | |
| 678 | |
| 679 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
| 680 _source = addr; | |
| 681 } | |
| 682 | |
| 683 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
| 684 assert(_words_remaining >= words, "processed too many words"); | |
| 685 _words_remaining -= words; | |
| 686 } | |
| 687 | |
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688 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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689 // does parts of the collection using parallel threads. The collection includes |
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690 // the tenured generation and the young generation. The permanent generation is |
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691 // collected at the same time as the other two generations but the permanent |
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692 // generation is collect by a single GC thread. The permanent generation is |
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693 // collected serially because of the requirement that during the processing of a |
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694 // klass AAA, any objects reference by AAA must already have been processed. |
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695 // This requirement is enforced by a left (lower address) to right (higher |
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696 // address) sliding compaction. |
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697 // |
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698 // There are four phases of the collection. |
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699 // |
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700 // - marking phase |
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701 // - summary phase |
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702 // - compacting phase |
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703 // - clean up phase |
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704 // |
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705 // Roughly speaking these phases correspond, respectively, to |
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706 // - mark all the live objects |
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707 // - calculate the destination of each object at the end of the collection |
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708 // - move the objects to their destination |
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709 // - update some references and reinitialize some variables |
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710 // |
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711 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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712 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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713 // complete marking of the heap. The summary phase is implemented in |
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714 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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715 // in PSParallelCompact::compact(). |
|
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716 // |
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717 // A space that is being collected is divided into regions and with each region |
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718 // is associated an object of type ParallelCompactData. Each region is of a |
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719 // fixed size and typically will contain more than 1 object and may have parts |
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720 // of objects at the front and back of the region. |
|
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721 // |
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722 // region -----+---------------------+---------- |
|
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723 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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724 // |
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725 // The marking phase does a complete marking of all live objects in the heap. |
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726 // The marking also compiles the size of the data for all live objects covered |
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727 // by the region. This size includes the part of any live object spanning onto |
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728 // the region (part of AAA if it is live) from the front, all live objects |
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729 // contained in the region (BBB and/or CCC if they are live), and the part of |
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730 // any live objects covered by the region that extends off the region (part of |
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731 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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732 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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733 // done atomically as is the accumulation of the size of the live objects |
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734 // covered by a region. |
|
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735 // |
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736 // The summary phase calculates the total live data to the left of each region |
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737 // XXX. Based on that total and the bottom of the space, it can calculate the |
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738 // starting location of the live data in XXX. The summary phase calculates for |
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739 // each region XXX quantites such as |
|
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740 // |
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741 // - the amount of live data at the beginning of a region from an object |
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742 // entering the region. |
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743 // - the location of the first live data on the region |
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744 // - a count of the number of regions receiving live data from XXX. |
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745 // |
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746 // See ParallelCompactData for precise details. The summary phase also |
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747 // calculates the dense prefix for the compaction. The dense prefix is a |
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748 // portion at the beginning of the space that is not moved. The objects in the |
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749 // dense prefix do need to have their object references updated. See method |
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750 // summarize_dense_prefix(). |
|
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751 // |
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752 // The summary phase is done using 1 GC thread. |
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753 // |
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754 // The compaction phase moves objects to their new location and updates all |
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755 // references in the object. |
|
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756 // |
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757 // A current exception is that objects that cross a region boundary are moved |
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758 // but do not have their references updated. References are not updated because |
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759 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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760 // has been updated. KKK likely resides in a region to the left of the region |
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761 // containing AAA. These AAA's have there references updated at the end in a |
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762 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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763 // An alternate strategy is being investigated for this deferral of updating. |
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764 // |
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765 // Compaction is done on a region basis. A region that is ready to be filled is |
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766 // put on a ready list and GC threads take region off the list and fill them. A |
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767 // region is ready to be filled if it empty of live objects. Such a region may |
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768 // have been initially empty (only contained dead objects) or may have had all |
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769 // its live objects copied out already. A region that compacts into itself is |
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770 // also ready for filling. The ready list is initially filled with empty |
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771 // regions and regions compacting into themselves. There is always at least 1 |
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772 // region that can be put on the ready list. The regions are atomically added |
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773 // and removed from the ready list. |
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774 |
| 0 | 775 class PSParallelCompact : AllStatic { |
| 776 public: | |
| 777 // Convenient access to type names. | |
| 778 typedef ParMarkBitMap::idx_t idx_t; | |
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779 typedef ParallelCompactData::RegionData RegionData; |
| 0 | 780 |
| 781 typedef enum { | |
| 782 perm_space_id, old_space_id, eden_space_id, | |
| 783 from_space_id, to_space_id, last_space_id | |
| 784 } SpaceId; | |
| 785 | |
| 786 public: | |
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787 // Inline closure decls |
| 0 | 788 // |
| 789 class IsAliveClosure: public BoolObjectClosure { | |
| 790 public: | |
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791 virtual void do_object(oop p); |
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792 virtual bool do_object_b(oop p); |
| 0 | 793 }; |
| 794 | |
| 795 class KeepAliveClosure: public OopClosure { | |
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796 private: |
| 0 | 797 ParCompactionManager* _compaction_manager; |
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798 protected: |
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799 template <class T> inline void do_oop_work(T* p); |
| 0 | 800 public: |
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801 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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802 virtual void do_oop(oop* p); |
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803 virtual void do_oop(narrowOop* p); |
| 0 | 804 }; |
| 805 | |
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806 // Current unused |
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807 class FollowRootClosure: public OopsInGenClosure { |
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808 private: |
| 0 | 809 ParCompactionManager* _compaction_manager; |
| 810 public: | |
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811 FollowRootClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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812 virtual void do_oop(oop* p); |
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813 virtual void do_oop(narrowOop* p); |
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814 }; |
| 0 | 815 |
| 816 class FollowStackClosure: public VoidClosure { | |
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817 private: |
| 0 | 818 ParCompactionManager* _compaction_manager; |
| 819 public: | |
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820 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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821 virtual void do_void(); |
| 0 | 822 }; |
| 823 | |
| 824 class AdjustPointerClosure: public OopsInGenClosure { | |
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825 private: |
| 0 | 826 bool _is_root; |
| 827 public: | |
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828 AdjustPointerClosure(bool is_root) : _is_root(is_root) { } |
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829 virtual void do_oop(oop* p); |
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830 virtual void do_oop(narrowOop* p); |
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831 // do not walk from thread stacks to the code cache on this phase |
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832 virtual void do_code_blob(CodeBlob* cb) const { } |
| 0 | 833 }; |
| 834 | |
| 835 // Closure for verifying update of pointers. Does not | |
| 836 // have any side effects. | |
| 837 class VerifyUpdateClosure: public ParMarkBitMapClosure { | |
| 838 const MutableSpace* _space; // Is this ever used? | |
| 839 | |
| 840 public: | |
| 841 VerifyUpdateClosure(ParCompactionManager* cm, const MutableSpace* sp) : | |
| 842 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), _space(sp) | |
| 843 { } | |
| 844 | |
| 845 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
| 846 | |
| 847 const MutableSpace* space() { return _space; } | |
| 848 }; | |
| 849 | |
| 850 // Closure for updating objects altered for debug checking | |
| 851 class ResetObjectsClosure: public ParMarkBitMapClosure { | |
| 852 public: | |
| 853 ResetObjectsClosure(ParCompactionManager* cm): | |
| 854 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm) | |
| 855 { } | |
| 856 | |
| 857 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
| 858 }; | |
| 859 | |
| 860 friend class KeepAliveClosure; | |
| 861 friend class FollowStackClosure; | |
| 862 friend class AdjustPointerClosure; | |
| 863 friend class FollowRootClosure; | |
| 864 friend class instanceKlassKlass; | |
| 865 friend class RefProcTaskProxy; | |
| 866 | |
| 867 private: | |
| 868 static elapsedTimer _accumulated_time; | |
| 869 static unsigned int _total_invocations; | |
| 870 static unsigned int _maximum_compaction_gc_num; | |
| 871 static jlong _time_of_last_gc; // ms | |
| 872 static CollectorCounters* _counters; | |
| 873 static ParMarkBitMap _mark_bitmap; | |
| 874 static ParallelCompactData _summary_data; | |
| 875 static IsAliveClosure _is_alive_closure; | |
| 876 static SpaceInfo _space_info[last_space_id]; | |
| 877 static bool _print_phases; | |
| 878 static AdjustPointerClosure _adjust_root_pointer_closure; | |
| 879 static AdjustPointerClosure _adjust_pointer_closure; | |
| 880 | |
| 881 // Reference processing (used in ...follow_contents) | |
| 882 static ReferenceProcessor* _ref_processor; | |
| 883 | |
| 884 // Updated location of intArrayKlassObj. | |
| 885 static klassOop _updated_int_array_klass_obj; | |
| 886 | |
| 887 // Values computed at initialization and used by dead_wood_limiter(). | |
| 888 static double _dwl_mean; | |
| 889 static double _dwl_std_dev; | |
| 890 static double _dwl_first_term; | |
| 891 static double _dwl_adjustment; | |
| 892 #ifdef ASSERT | |
| 893 static bool _dwl_initialized; | |
| 894 #endif // #ifdef ASSERT | |
| 895 | |
| 896 private: | |
| 897 // Closure accessors | |
|
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898 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
| 0 | 899 static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&_adjust_root_pointer_closure; } |
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900 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
| 0 | 901 |
| 902 static void initialize_space_info(); | |
| 903 | |
| 904 // Return true if details about individual phases should be printed. | |
| 905 static inline bool print_phases(); | |
| 906 | |
| 907 // Clear the marking bitmap and summary data that cover the specified space. | |
| 908 static void clear_data_covering_space(SpaceId id); | |
| 909 | |
| 910 static void pre_compact(PreGCValues* pre_gc_values); | |
| 911 static void post_compact(); | |
| 912 | |
| 913 // Mark live objects | |
| 914 static void marking_phase(ParCompactionManager* cm, | |
| 915 bool maximum_heap_compaction); | |
| 941 | 916 static void follow_weak_klass_links(); |
| 917 static void follow_mdo_weak_refs(); | |
| 0 | 918 |
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919 template <class T> static inline void adjust_pointer(T* p, bool is_root); |
| 0 | 920 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
| 921 | |
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922 template <class T> |
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923 static inline void follow_root(ParCompactionManager* cm, T* p); |
| 0 | 924 |
| 925 // Compute the dense prefix for the designated space. This is an experimental | |
| 926 // implementation currently not used in production. | |
| 927 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
| 928 bool maximum_compaction); | |
| 929 | |
| 930 // Methods used to compute the dense prefix. | |
| 931 | |
| 932 // Compute the value of the normal distribution at x = density. The mean and | |
| 933 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
| 934 static inline double normal_distribution(double density); | |
| 935 | |
| 936 // Initialize the static vars used by dead_wood_limiter(). | |
| 937 static void initialize_dead_wood_limiter(); | |
| 938 | |
| 939 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
| 940 // not reclaimed). | |
| 941 static double dead_wood_limiter(double density, size_t min_percent); | |
| 942 | |
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943 // Find the first (left-most) region in the range [beg, end) that has at least |
| 0 | 944 // dead_words of dead space to the left. The argument beg must be the first |
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945 // region in the space that is not completely live. |
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946 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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947 const RegionData* end, |
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948 size_t dead_words); |
| 0 | 949 |
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950 // Return a pointer to the first region in the range [beg, end) that is not |
| 0 | 951 // completely full. |
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952 static RegionData* first_dead_space_region(const RegionData* beg, |
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953 const RegionData* end); |
| 0 | 954 |
| 955 // Return a value indicating the benefit or 'yield' if the compacted region | |
| 956 // were to start (or equivalently if the dense prefix were to end) at the | |
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957 // candidate region. Higher values are better. |
| 0 | 958 // |
| 959 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
| 960 // updating references in the dense prefix plus (b) copying objects and | |
| 961 // updating references in the compacted region. | |
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962 static inline double reclaimed_ratio(const RegionData* const candidate, |
| 0 | 963 HeapWord* const bottom, |
| 964 HeapWord* const top, | |
| 965 HeapWord* const new_top); | |
| 966 | |
| 967 // Compute the dense prefix for the designated space. | |
| 968 static HeapWord* compute_dense_prefix(const SpaceId id, | |
| 969 bool maximum_compaction); | |
| 970 | |
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971 // Return true if dead space crosses onto the specified Region; bit must be |
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972 // the bit index corresponding to the first word of the Region. |
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973 static inline bool dead_space_crosses_boundary(const RegionData* region, |
| 0 | 974 idx_t bit); |
| 975 | |
| 976 // Summary phase utility routine to fill dead space (if any) at the dense | |
| 977 // prefix boundary. Should only be called if the the dense prefix is | |
| 978 // non-empty. | |
| 979 static void fill_dense_prefix_end(SpaceId id); | |
| 980 | |
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981 // Clear the summary data source_region field for the specified addresses. |
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982 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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983 |
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984 #ifndef PRODUCT |
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985 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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986 |
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987 // Fill the region [start, start + words) with live object(s). Only usable |
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988 // for the old and permanent generations. |
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989 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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990 size_t words); |
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991 // Include the new objects in the summary data. |
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992 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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993 |
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994 // Add live objects to a survivor space since it's rare that both survivors |
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995 // are non-empty. |
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996 static void provoke_split_fill_survivor(SpaceId id); |
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997 |
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998 // Add live objects and/or choose the dense prefix to provoke splitting. |
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999 static void provoke_split(bool & maximum_compaction); |
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1000 #endif |
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1001 |
| 0 | 1002 static void summarize_spaces_quick(); |
| 1003 static void summarize_space(SpaceId id, bool maximum_compaction); | |
| 1004 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
| 1005 | |
| 1006 // Adjust addresses in roots. Does not adjust addresses in heap. | |
| 1007 static void adjust_roots(); | |
| 1008 | |
| 1009 // Serial code executed in preparation for the compaction phase. | |
| 1010 static void compact_prologue(); | |
| 1011 | |
| 1012 // Move objects to new locations. | |
| 1013 static void compact_perm(ParCompactionManager* cm); | |
| 1014 static void compact(); | |
| 1015 | |
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1016 // Add available regions to the stack and draining tasks to the task queue. |
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1017 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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1018 uint parallel_gc_threads); |
| 0 | 1019 |
| 1020 // Add dense prefix update tasks to the task queue. | |
| 1021 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
| 1022 uint parallel_gc_threads); | |
| 1023 | |
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1024 // Add region stealing tasks to the task queue. |
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1025 static void enqueue_region_stealing_tasks( |
| 0 | 1026 GCTaskQueue* q, |
| 1027 ParallelTaskTerminator* terminator_ptr, | |
| 1028 uint parallel_gc_threads); | |
| 1029 | |
| 1030 // For debugging only - compacts the old gen serially | |
| 1031 static void compact_serial(ParCompactionManager* cm); | |
| 1032 | |
| 1033 // If objects are left in eden after a collection, try to move the boundary | |
| 1034 // and absorb them into the old gen. Returns true if eden was emptied. | |
| 1035 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 1036 PSYoungGen* young_gen, | |
| 1037 PSOldGen* old_gen); | |
| 1038 | |
| 1039 // Reset time since last full gc | |
| 1040 static void reset_millis_since_last_gc(); | |
| 1041 | |
| 1042 protected: | |
| 1043 #ifdef VALIDATE_MARK_SWEEP | |
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1044 static GrowableArray<void*>* _root_refs_stack; |
| 0 | 1045 static GrowableArray<oop> * _live_oops; |
| 1046 static GrowableArray<oop> * _live_oops_moved_to; | |
| 1047 static GrowableArray<size_t>* _live_oops_size; | |
| 1048 static size_t _live_oops_index; | |
| 1049 static size_t _live_oops_index_at_perm; | |
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1050 static GrowableArray<void*>* _other_refs_stack; |
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1051 static GrowableArray<void*>* _adjusted_pointers; |
| 0 | 1052 static bool _pointer_tracking; |
| 1053 static bool _root_tracking; | |
| 1054 | |
| 1055 // The following arrays are saved since the time of the last GC and | |
| 1056 // assist in tracking down problems where someone has done an errant | |
| 1057 // store into the heap, usually to an oop that wasn't properly | |
| 1058 // handleized across a GC. If we crash or otherwise fail before the | |
| 1059 // next GC, we can query these arrays to find out the object we had | |
| 1060 // intended to do the store to (assuming it is still alive) and the | |
| 1061 // offset within that object. Covered under RecordMarkSweepCompaction. | |
| 1062 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
| 1063 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
| 1064 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
| 1065 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
| 1066 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
| 1067 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
| 1068 #endif | |
| 1069 | |
| 1070 public: | |
| 1071 class MarkAndPushClosure: public OopClosure { | |
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1072 private: |
| 0 | 1073 ParCompactionManager* _compaction_manager; |
| 1074 public: | |
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1075 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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1076 virtual void do_oop(oop* p); |
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1077 virtual void do_oop(narrowOop* p); |
| 0 | 1078 }; |
| 1079 | |
| 1080 PSParallelCompact(); | |
| 1081 | |
| 1082 // Convenient accessor for Universe::heap(). | |
| 1083 static ParallelScavengeHeap* gc_heap() { | |
| 1084 return (ParallelScavengeHeap*)Universe::heap(); | |
| 1085 } | |
| 1086 | |
| 1087 static void invoke(bool maximum_heap_compaction); | |
| 1088 static void invoke_no_policy(bool maximum_heap_compaction); | |
| 1089 | |
| 1090 static void post_initialize(); | |
| 1091 // Perform initialization for PSParallelCompact that requires | |
| 1092 // allocations. This should be called during the VM initialization | |
| 1093 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
| 1094 // in the event of a failure. | |
| 1095 static bool initialize(); | |
| 1096 | |
| 1097 // Public accessors | |
| 1098 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
| 1099 static unsigned int total_invocations() { return _total_invocations; } | |
| 1100 static CollectorCounters* counters() { return _counters; } | |
| 1101 | |
| 1102 // Used to add tasks | |
| 1103 static GCTaskManager* const gc_task_manager(); | |
| 1104 static klassOop updated_int_array_klass_obj() { | |
| 1105 return _updated_int_array_klass_obj; | |
| 1106 } | |
| 1107 | |
| 1108 // Marking support | |
| 1109 static inline bool mark_obj(oop obj); | |
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1110 // Check mark and maybe push on marking stack |
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1111 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1112 T* p); |
| 0 | 1113 |
| 1114 // Compaction support. | |
| 1115 // Return true if p is in the range [beg_addr, end_addr). | |
| 1116 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
| 1117 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
| 1118 | |
| 1119 // Convenience wrappers for per-space data kept in _space_info. | |
| 1120 static inline MutableSpace* space(SpaceId space_id); | |
| 1121 static inline HeapWord* new_top(SpaceId space_id); | |
| 1122 static inline HeapWord* dense_prefix(SpaceId space_id); | |
| 1123 static inline ObjectStartArray* start_array(SpaceId space_id); | |
| 1124 | |
| 1125 // Return true if the klass should be updated. | |
| 1126 static inline bool should_update_klass(klassOop k); | |
| 1127 | |
| 1128 // Move and update the live objects in the specified space. | |
| 1129 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
| 1130 | |
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1131 // Process the end of the given region range in the dense prefix. |
| 0 | 1132 // This includes saving any object not updated. |
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1133 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1134 size_t region_start_index, |
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1135 size_t region_end_index, |
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1136 idx_t exiting_object_offset, |
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1137 idx_t region_offset_start, |
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1138 idx_t region_offset_end); |
| 0 | 1139 |
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1140 // Update a region in the dense prefix. For each live object |
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1141 // in the region, update it's interior references. For each |
| 0 | 1142 // dead object, fill it with deadwood. Dead space at the end |
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1143 // of a region range will be filled to the start of the next |
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1144 // live object regardless of the region_index_end. None of the |
| 0 | 1145 // objects in the dense prefix move and dead space is dead |
| 1146 // (holds only dead objects that don't need any processing), so | |
| 1147 // dead space can be filled in any order. | |
| 1148 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
| 1149 SpaceId space_id, | |
|
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1150 size_t region_index_start, |
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1151 size_t region_index_end); |
| 0 | 1152 |
| 1153 // Return the address of the count + 1st live word in the range [beg, end). | |
| 1154 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
| 1155 | |
| 1156 // Return the address of the word to be copied to dest_addr, which must be | |
|
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1157 // aligned to a region boundary. |
| 0 | 1158 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
|
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1159 SpaceId src_space_id, |
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1160 size_t src_region_idx); |
| 0 | 1161 |
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1162 // Determine the next source region, set closure.source() to the start of the |
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1163 // new region return the region index. Parameter end_addr is the address one |
| 0 | 1164 // beyond the end of source range just processed. If necessary, switch to a |
| 1165 // new source space and set src_space_id (in-out parameter) and src_space_top | |
| 1166 // (out parameter) accordingly. | |
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1167 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1168 SpaceId& src_space_id, |
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1169 HeapWord*& src_space_top, |
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1170 HeapWord* end_addr); |
| 0 | 1171 |
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1172 // Decrement the destination count for each non-empty source region in the |
|
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1173 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1174 // count for a region goes to 0 and it needs to be filled, enqueue it. |
| 0 | 1175 static void decrement_destination_counts(ParCompactionManager* cm, |
|
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1176 SpaceId src_space_id, |
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1177 size_t beg_region, |
| 0 | 1178 HeapWord* end_addr); |
| 1179 | |
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1180 // Fill a region, copying objects from one or more source regions. |
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1181 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1182 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1183 fill_region(cm, region); |
| 0 | 1184 } |
| 1185 | |
| 1186 // Update the deferred objects in the space. | |
| 1187 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
| 1188 | |
| 1189 // Mark pointer and follow contents. | |
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1190 template <class T> |
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1191 static inline void mark_and_follow(ParCompactionManager* cm, T* p); |
| 0 | 1192 |
| 1193 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
| 1194 static ParallelCompactData& summary_data() { return _summary_data; } | |
| 1195 | |
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1196 static inline void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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1197 static inline void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
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1198 |
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1199 template <class T> |
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1200 static inline void adjust_pointer(T* p, |
| 0 | 1201 HeapWord* beg_addr, |
| 1202 HeapWord* end_addr); | |
| 1203 | |
| 1204 // Reference Processing | |
| 1205 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
| 1206 | |
| 1207 // Return the SpaceId for the given address. | |
| 1208 static SpaceId space_id(HeapWord* addr); | |
| 1209 | |
| 1210 // Time since last full gc (in milliseconds). | |
| 1211 static jlong millis_since_last_gc(); | |
| 1212 | |
| 1213 #ifdef VALIDATE_MARK_SWEEP | |
|
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1214 static void track_adjusted_pointer(void* p, bool isroot); |
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1215 static void check_adjust_pointer(void* p); |
| 0 | 1216 static void track_interior_pointers(oop obj); |
| 1217 static void check_interior_pointers(); | |
| 1218 | |
| 1219 static void reset_live_oop_tracking(bool at_perm); | |
| 1220 static void register_live_oop(oop p, size_t size); | |
| 1221 static void validate_live_oop(oop p, size_t size); | |
| 1222 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
| 1223 static void compaction_complete(); | |
| 1224 | |
| 1225 // Querying operation of RecordMarkSweepCompaction results. | |
| 1226 // Finds and prints the current base oop and offset for a word | |
| 1227 // within an oop that was live during the last GC. Helpful for | |
| 1228 // tracking down heap stomps. | |
| 1229 static void print_new_location_of_heap_address(HeapWord* q); | |
| 1230 #endif // #ifdef VALIDATE_MARK_SWEEP | |
| 1231 | |
| 1232 // Call backs for class unloading | |
| 1233 // Update subklass/sibling/implementor links at end of marking. | |
| 1234 static void revisit_weak_klass_link(ParCompactionManager* cm, Klass* k); | |
| 1235 | |
| 941 | 1236 // Clear unmarked oops in MDOs at the end of marking. |
| 1237 static void revisit_mdo(ParCompactionManager* cm, DataLayout* p); | |
| 1238 | |
| 0 | 1239 #ifndef PRODUCT |
| 1240 // Debugging support. | |
| 1241 static const char* space_names[last_space_id]; | |
|
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1242 static void print_region_ranges(); |
| 0 | 1243 static void print_dense_prefix_stats(const char* const algorithm, |
| 1244 const SpaceId id, | |
| 1245 const bool maximum_compaction, | |
| 1246 HeapWord* const addr); | |
|
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1247 static void summary_phase_msg(SpaceId dst_space_id, |
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1248 HeapWord* dst_beg, HeapWord* dst_end, |
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1249 SpaceId src_space_id, |
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1250 HeapWord* src_beg, HeapWord* src_end); |
| 0 | 1251 #endif // #ifndef PRODUCT |
| 1252 | |
| 1253 #ifdef ASSERT | |
|
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1254 // Sanity check the new location of a word in the heap. |
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1255 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1256 // Verify that all the regions have been emptied. |
| 0 | 1257 static void verify_complete(SpaceId space_id); |
| 1258 #endif // #ifdef ASSERT | |
| 1259 }; | |
| 1260 | |
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1261 inline bool PSParallelCompact::mark_obj(oop obj) { |
| 0 | 1262 const int obj_size = obj->size(); |
| 1263 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
| 1264 _summary_data.add_obj(obj, obj_size); | |
| 1265 return true; | |
| 1266 } else { | |
| 1267 return false; | |
| 1268 } | |
| 1269 } | |
| 1270 | |
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1271 template <class T> |
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1272 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1273 assert(!Universe::heap()->is_in_reserved(p), |
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1274 "roots shouldn't be things within the heap"); |
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1275 #ifdef VALIDATE_MARK_SWEEP |
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1276 if (ValidateMarkSweep) { |
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1277 guarantee(!_root_refs_stack->contains(p), "should only be in here once"); |
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1278 _root_refs_stack->push(p); |
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1279 } |
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1280 #endif |
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1281 T heap_oop = oopDesc::load_heap_oop(p); |
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1282 if (!oopDesc::is_null(heap_oop)) { |
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1283 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1284 if (mark_bitmap()->is_unmarked(obj)) { |
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1285 if (mark_obj(obj)) { |
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1286 obj->follow_contents(cm); |
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1287 } |
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1288 } |
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1289 } |
|
1311
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1290 cm->follow_marking_stacks(); |
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1291 } |
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1292 |
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1293 template <class T> |
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1294 inline void PSParallelCompact::mark_and_follow(ParCompactionManager* cm, |
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1295 T* p) { |
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1296 T heap_oop = oopDesc::load_heap_oop(p); |
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1297 if (!oopDesc::is_null(heap_oop)) { |
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1298 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1299 if (mark_bitmap()->is_unmarked(obj)) { |
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1300 if (mark_obj(obj)) { |
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1301 obj->follow_contents(cm); |
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1302 } |
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1303 } |
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1304 } |
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1305 } |
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1306 |
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1307 template <class T> |
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1308 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1309 T heap_oop = oopDesc::load_heap_oop(p); |
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1310 if (!oopDesc::is_null(heap_oop)) { |
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1311 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 1638 | 1312 if (mark_bitmap()->is_unmarked(obj) && mark_obj(obj)) { |
| 1313 cm->push(obj); | |
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1314 } |
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1315 } |
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1316 } |
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1317 |
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1318 template <class T> |
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1319 inline void PSParallelCompact::adjust_pointer(T* p, bool isroot) { |
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1320 T heap_oop = oopDesc::load_heap_oop(p); |
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1321 if (!oopDesc::is_null(heap_oop)) { |
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1322 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1323 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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1324 assert(new_obj != NULL || // is forwarding ptr? |
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1325 obj->is_shared(), // never forwarded? |
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1326 "should be forwarded"); |
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1327 // Just always do the update unconditionally? |
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1328 if (new_obj != NULL) { |
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1329 assert(Universe::heap()->is_in_reserved(new_obj), |
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1330 "should be in object space"); |
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1331 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1332 } |
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1333 } |
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1334 VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot)); |
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1335 } |
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1336 |
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1337 template <class T> |
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1338 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1339 #ifdef VALIDATE_MARK_SWEEP |
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1340 if (ValidateMarkSweep) { |
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1341 if (!Universe::heap()->is_in_reserved(p)) { |
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1342 _root_refs_stack->push(p); |
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1343 } else { |
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1344 _other_refs_stack->push(p); |
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1345 } |
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1346 } |
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1347 #endif |
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1348 mark_and_push(_compaction_manager, p); |
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1349 } |
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1350 |
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1351 inline bool PSParallelCompact::print_phases() { |
| 0 | 1352 return _print_phases; |
| 1353 } | |
| 1354 | |
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1355 inline double PSParallelCompact::normal_distribution(double density) { |
| 0 | 1356 assert(_dwl_initialized, "uninitialized"); |
| 1357 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
| 1358 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
| 1359 } | |
| 1360 | |
| 1361 inline bool | |
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1362 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
| 0 | 1363 idx_t bit) |
| 1364 { | |
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1365 assert(bit > 0, "cannot call this for the first bit/region"); |
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1366 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
| 0 | 1367 "sanity check"); |
| 1368 | |
| 1369 // Dead space crosses the boundary if (1) a partial object does not extend | |
|
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1370 // onto the region, (2) an object does not start at the beginning of the |
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1371 // region, and (3) an object does not end at the end of the prior region. |
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1372 return region->partial_obj_size() == 0 && |
| 0 | 1373 !_mark_bitmap.is_obj_beg(bit) && |
| 1374 !_mark_bitmap.is_obj_end(bit - 1); | |
| 1375 } | |
| 1376 | |
| 1377 inline bool | |
| 1378 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
| 1379 return p >= beg_addr && p < end_addr; | |
| 1380 } | |
| 1381 | |
| 1382 inline bool | |
| 1383 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
| 1384 return is_in((HeapWord*)p, beg_addr, end_addr); | |
| 1385 } | |
| 1386 | |
| 1387 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
| 1388 assert(id < last_space_id, "id out of range"); | |
| 1389 return _space_info[id].space(); | |
| 1390 } | |
| 1391 | |
| 1392 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
| 1393 assert(id < last_space_id, "id out of range"); | |
| 1394 return _space_info[id].new_top(); | |
| 1395 } | |
| 1396 | |
| 1397 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
| 1398 assert(id < last_space_id, "id out of range"); | |
| 1399 return _space_info[id].dense_prefix(); | |
| 1400 } | |
| 1401 | |
| 1402 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
| 1403 assert(id < last_space_id, "id out of range"); | |
| 1404 return _space_info[id].start_array(); | |
| 1405 } | |
| 1406 | |
| 1407 inline bool PSParallelCompact::should_update_klass(klassOop k) { | |
| 1408 return ((HeapWord*) k) >= dense_prefix(perm_space_id); | |
| 1409 } | |
| 1410 | |
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1411 template <class T> |
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1412 inline void PSParallelCompact::adjust_pointer(T* p, |
| 0 | 1413 HeapWord* beg_addr, |
| 1414 HeapWord* end_addr) { | |
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1415 if (is_in((HeapWord*)p, beg_addr, end_addr)) { |
| 0 | 1416 adjust_pointer(p); |
| 1417 } | |
| 1418 } | |
| 1419 | |
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1420 #ifdef ASSERT |
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1421 inline void |
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1422 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1423 { |
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1424 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1425 "must move left or to a different space"); |
|
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1426 assert(is_object_aligned((intptr_t)old_addr) && is_object_aligned((intptr_t)new_addr), |
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1427 "checking alignment"); |
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1428 } |
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1429 #endif // ASSERT |
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1430 |
| 0 | 1431 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
| 1432 public: | |
| 1433 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
| 1434 ObjectStartArray* start_array, | |
| 1435 HeapWord* destination, size_t words); | |
| 1436 | |
| 1437 // Accessors. | |
| 1438 HeapWord* destination() const { return _destination; } | |
| 1439 | |
| 1440 // If the object will fit (size <= words_remaining()), copy it to the current | |
| 1441 // destination, update the interior oops and the start array and return either | |
| 1442 // full (if the closure is full) or incomplete. If the object will not fit, | |
| 1443 // return would_overflow. | |
| 1444 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
| 1445 | |
| 1446 // Copy enough words to fill this closure, starting at source(). Interior | |
| 1447 // oops and the start array are not updated. Return full. | |
| 1448 IterationStatus copy_until_full(); | |
| 1449 | |
| 1450 // Copy enough words to fill this closure or to the end of an object, | |
| 1451 // whichever is smaller, starting at source(). Interior oops and the start | |
| 1452 // array are not updated. | |
| 1453 void copy_partial_obj(); | |
| 1454 | |
| 1455 protected: | |
| 1456 // Update variables to indicate that word_count words were processed. | |
| 1457 inline void update_state(size_t word_count); | |
| 1458 | |
| 1459 protected: | |
| 1460 ObjectStartArray* const _start_array; | |
| 1461 HeapWord* _destination; // Next addr to be written. | |
| 1462 }; | |
| 1463 | |
| 1464 inline | |
| 1465 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
| 1466 ParCompactionManager* cm, | |
| 1467 ObjectStartArray* start_array, | |
| 1468 HeapWord* destination, | |
| 1469 size_t words) : | |
| 1470 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
| 1471 { | |
| 1472 _destination = destination; | |
| 1473 } | |
| 1474 | |
| 1475 inline void MoveAndUpdateClosure::update_state(size_t words) | |
| 1476 { | |
| 1477 decrement_words_remaining(words); | |
| 1478 _source += words; | |
| 1479 _destination += words; | |
| 1480 } | |
| 1481 | |
| 1482 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
| 1483 private: | |
| 1484 const PSParallelCompact::SpaceId _space_id; | |
| 1485 ObjectStartArray* const _start_array; | |
| 1486 | |
| 1487 public: | |
| 1488 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
| 1489 ParCompactionManager* cm, | |
| 1490 PSParallelCompact::SpaceId space_id); | |
| 1491 | |
| 1492 // Update the object. | |
| 1493 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
| 1494 | |
| 1495 inline void do_addr(HeapWord* addr); | |
| 1496 }; | |
| 1497 | |
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1498 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1499 { |
| 0 | 1500 _start_array->allocate_block(addr); |
| 1501 oop(addr)->update_contents(compaction_manager()); | |
| 1502 } | |
| 1503 | |
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1504 class FillClosure: public ParMarkBitMapClosure |
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1505 { |
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1506 public: |
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1507 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
| 0 | 1508 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
|
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1509 _start_array(PSParallelCompact::start_array(space_id)) |
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1510 { |
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1511 assert(space_id == PSParallelCompact::perm_space_id || |
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1512 space_id == PSParallelCompact::old_space_id, |
| 0 | 1513 "cannot use FillClosure in the young gen"); |
| 1514 } | |
| 1515 | |
| 1516 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
|
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1517 CollectedHeap::fill_with_objects(addr, size); |
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1518 HeapWord* const end = addr + size; |
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1519 do { |
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1520 _start_array->allocate_block(addr); |
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1521 addr += oop(addr)->size(); |
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1522 } while (addr < end); |
| 0 | 1523 return ParMarkBitMap::incomplete; |
| 1524 } | |
| 1525 | |
| 1526 private: | |
|
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1527 ObjectStartArray* const _start_array; |
| 0 | 1528 }; |
| 1972 | 1529 |
| 1530 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |