Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 10329:10f759898d40
7186737: Unable to allocate bit maps or card tables for parallel gc for the requested heap
Summary: Print helpful error message when VM aborts due to inability of allocating bit maps or card tables
Reviewed-by: jmasa, stefank
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Mon, 20 May 2013 10:44:33 -0700 |
| parents | 001ec9515f84 |
| children | 5534bd30c151 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" | |
| 31 #include "gc_implementation/shared/collectorCounters.hpp" | |
| 32 #include "gc_implementation/shared/markSweep.hpp" | |
| 33 #include "gc_implementation/shared/mutableSpace.hpp" | |
| 34 #include "memory/sharedHeap.hpp" | |
| 35 #include "oops/oop.hpp" | |
| 36 | |
| 0 | 37 class ParallelScavengeHeap; |
| 38 class PSAdaptiveSizePolicy; | |
| 39 class PSYoungGen; | |
| 40 class PSOldGen; | |
| 41 class ParCompactionManager; | |
| 42 class ParallelTaskTerminator; | |
| 43 class PSParallelCompact; | |
| 44 class GCTaskManager; | |
| 45 class GCTaskQueue; | |
| 46 class PreGCValues; | |
| 47 class MoveAndUpdateClosure; | |
| 48 class RefProcTaskExecutor; | |
| 49 | |
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50 // The SplitInfo class holds the information needed to 'split' a source region |
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51 // so that the live data can be copied to two destination *spaces*. Normally, |
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52 // all the live data in a region is copied to a single destination space (e.g., |
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53 // everything live in a region in eden is copied entirely into the old gen). |
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54 // However, when the heap is nearly full, all the live data in eden may not fit |
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55 // into the old gen. Copying only some of the regions from eden to old gen |
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56 // requires finding a region that does not contain a partial object (i.e., no |
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57 // live object crosses the region boundary) somewhere near the last object that |
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58 // does fit into the old gen. Since it's not always possible to find such a |
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59 // region, splitting is necessary for predictable behavior. |
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60 // |
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61 // A region is always split at the end of the partial object. This avoids |
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62 // additional tests when calculating the new location of a pointer, which is a |
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63 // very hot code path. The partial object and everything to its left will be |
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64 // copied to another space (call it dest_space_1). The live data to the right |
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65 // of the partial object will be copied either within the space itself, or to a |
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66 // different destination space (distinct from dest_space_1). |
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67 // |
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68 // Split points are identified during the summary phase, when region |
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69 // destinations are computed: data about the split, including the |
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70 // partial_object_size, is recorded in a SplitInfo record and the |
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71 // partial_object_size field in the summary data is set to zero. The zeroing is |
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72 // possible (and necessary) since the partial object will move to a different |
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73 // destination space than anything to its right, thus the partial object should |
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74 // not affect the locations of any objects to its right. |
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75 // |
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76 // The recorded data is used during the compaction phase, but only rarely: when |
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77 // the partial object on the split region will be copied across a destination |
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78 // region boundary. This test is made once each time a region is filled, and is |
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79 // a simple address comparison, so the overhead is negligible (see |
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80 // PSParallelCompact::first_src_addr()). |
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81 // |
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82 // Notes: |
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83 // |
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84 // Only regions with partial objects are split; a region without a partial |
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85 // object does not need any extra bookkeeping. |
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86 // |
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87 // At most one region is split per space, so the amount of data required is |
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88 // constant. |
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89 // |
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90 // A region is split only when the destination space would overflow. Once that |
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91 // happens, the destination space is abandoned and no other data (even from |
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92 // other source spaces) is targeted to that destination space. Abandoning the |
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93 // destination space may leave a somewhat large unused area at the end, if a |
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94 // large object caused the overflow. |
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95 // |
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96 // Future work: |
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97 // |
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98 // More bookkeeping would be required to continue to use the destination space. |
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99 // The most general solution would allow data from regions in two different |
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100 // source spaces to be "joined" in a single destination region. At the very |
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101 // least, additional code would be required in next_src_region() to detect the |
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102 // join and skip to an out-of-order source region. If the join region was also |
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103 // the last destination region to which a split region was copied (the most |
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104 // likely case), then additional work would be needed to get fill_region() to |
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105 // stop iteration and switch to a new source region at the right point. Basic |
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106 // idea would be to use a fake value for the top of the source space. It is |
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107 // doable, if a bit tricky. |
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108 // |
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109 // A simpler (but less general) solution would fill the remainder of the |
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110 // destination region with a dummy object and continue filling the next |
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111 // destination region. |
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112 |
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113 class SplitInfo |
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114 { |
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115 public: |
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116 // Return true if this split info is valid (i.e., if a split has been |
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117 // recorded). The very first region cannot have a partial object and thus is |
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118 // never split, so 0 is the 'invalid' value. |
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119 bool is_valid() const { return _src_region_idx > 0; } |
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120 |
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121 // Return true if this split holds data for the specified source region. |
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122 inline bool is_split(size_t source_region) const; |
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123 |
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124 // The index of the split region, the size of the partial object on that |
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125 // region and the destination of the partial object. |
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126 size_t src_region_idx() const { return _src_region_idx; } |
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127 size_t partial_obj_size() const { return _partial_obj_size; } |
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128 HeapWord* destination() const { return _destination; } |
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129 |
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130 // The destination count of the partial object referenced by this split |
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131 // (either 1 or 2). This must be added to the destination count of the |
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132 // remainder of the source region. |
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133 unsigned int destination_count() const { return _destination_count; } |
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134 |
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135 // If a word within the partial object will be written to the first word of a |
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136 // destination region, this is the address of the destination region; |
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137 // otherwise this is NULL. |
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138 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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139 |
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140 // If a word within the partial object will be written to the first word of a |
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141 // destination region, this is the address of that word within the partial |
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142 // object; otherwise this is NULL. |
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143 HeapWord* first_src_addr() const { return _first_src_addr; } |
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144 |
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145 // Record the data necessary to split the region src_region_idx. |
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146 void record(size_t src_region_idx, size_t partial_obj_size, |
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147 HeapWord* destination); |
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148 |
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149 void clear(); |
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150 |
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151 DEBUG_ONLY(void verify_clear();) |
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152 |
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153 private: |
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154 size_t _src_region_idx; |
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155 size_t _partial_obj_size; |
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156 HeapWord* _destination; |
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157 unsigned int _destination_count; |
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158 HeapWord* _dest_region_addr; |
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159 HeapWord* _first_src_addr; |
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160 }; |
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161 |
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162 inline bool SplitInfo::is_split(size_t region_idx) const |
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163 { |
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164 return _src_region_idx == region_idx && is_valid(); |
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165 } |
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166 |
| 0 | 167 class SpaceInfo |
| 168 { | |
| 169 public: | |
| 170 MutableSpace* space() const { return _space; } | |
| 171 | |
| 172 // Where the free space will start after the collection. Valid only after the | |
| 173 // summary phase completes. | |
| 174 HeapWord* new_top() const { return _new_top; } | |
| 175 | |
| 176 // Allows new_top to be set. | |
| 177 HeapWord** new_top_addr() { return &_new_top; } | |
| 178 | |
| 179 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
| 180 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
| 181 | |
| 182 // Where the dense prefix ends, or the compacted region begins. | |
| 183 HeapWord* dense_prefix() const { return _dense_prefix; } | |
| 184 | |
| 185 // The start array for the (generation containing the) space, or NULL if there | |
| 186 // is no start array. | |
| 187 ObjectStartArray* start_array() const { return _start_array; } | |
| 188 | |
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189 SplitInfo& split_info() { return _split_info; } |
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190 |
| 0 | 191 void set_space(MutableSpace* s) { _space = s; } |
| 192 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
| 193 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
| 194 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
| 195 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
| 196 | |
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197 void publish_new_top() const { _space->set_top(_new_top); } |
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198 |
| 0 | 199 private: |
| 200 MutableSpace* _space; | |
| 201 HeapWord* _new_top; | |
| 202 HeapWord* _min_dense_prefix; | |
| 203 HeapWord* _dense_prefix; | |
| 204 ObjectStartArray* _start_array; | |
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205 SplitInfo _split_info; |
| 0 | 206 }; |
| 207 | |
| 208 class ParallelCompactData | |
| 209 { | |
| 210 public: | |
| 211 // Sizes are in HeapWords, unless indicated otherwise. | |
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212 static const size_t Log2RegionSize; |
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213 static const size_t RegionSize; |
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214 static const size_t RegionSizeBytes; |
| 0 | 215 |
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216 // Mask for the bits in a size_t to get an offset within a region. |
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217 static const size_t RegionSizeOffsetMask; |
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218 // Mask for the bits in a pointer to get an offset within a region. |
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219 static const size_t RegionAddrOffsetMask; |
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220 // Mask for the bits in a pointer to get the address of the start of a region. |
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221 static const size_t RegionAddrMask; |
| 0 | 222 |
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223 class RegionData |
| 0 | 224 { |
| 225 public: | |
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226 // Destination address of the region. |
| 0 | 227 HeapWord* destination() const { return _destination; } |
| 228 | |
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229 // The first region containing data destined for this region. |
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230 size_t source_region() const { return _source_region; } |
| 0 | 231 |
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232 // The object (if any) starting in this region and ending in a different |
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233 // region that could not be updated during the main (parallel) compaction |
| 0 | 234 // phase. This is different from _partial_obj_addr, which is an object that |
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235 // extends onto a source region. However, the two uses do not overlap in |
| 0 | 236 // time, so the same field is used to save space. |
| 237 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
| 238 | |
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239 // The starting address of the partial object extending onto the region. |
| 0 | 240 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
| 241 | |
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242 // Size of the partial object extending onto the region (words). |
| 0 | 243 size_t partial_obj_size() const { return _partial_obj_size; } |
| 244 | |
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245 // Size of live data that lies within this region due to objects that start |
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246 // in this region (words). This does not include the partial object |
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247 // extending onto the region (if any), or the part of an object that extends |
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248 // onto the next region (if any). |
| 0 | 249 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
| 250 | |
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251 // Total live data that lies within the region (words). |
| 0 | 252 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
| 253 | |
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254 // The destination_count is the number of other regions to which data from |
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255 // this region will be copied. At the end of the summary phase, the valid |
| 0 | 256 // values of destination_count are |
| 257 // | |
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258 // 0 - data from the region will be compacted completely into itself, or the |
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259 // region is empty. The region can be claimed and then filled. |
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260 // 1 - data from the region will be compacted into 1 other region; some |
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261 // data from the region may also be compacted into the region itself. |
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262 // 2 - data from the region will be copied to 2 other regions. |
| 0 | 263 // |
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264 // During compaction as regions are emptied, the destination_count is |
| 0 | 265 // decremented (atomically) and when it reaches 0, it can be claimed and |
| 266 // then filled. | |
| 267 // | |
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268 // A region is claimed for processing by atomically changing the |
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269 // destination_count to the claimed value (dc_claimed). After a region has |
| 0 | 270 // been filled, the destination_count should be set to the completed value |
| 271 // (dc_completed). | |
| 272 inline uint destination_count() const; | |
| 273 inline uint destination_count_raw() const; | |
| 274 | |
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275 // The location of the java heap data that corresponds to this region. |
| 0 | 276 inline HeapWord* data_location() const; |
| 277 | |
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278 // The highest address referenced by objects in this region. |
| 0 | 279 inline HeapWord* highest_ref() const; |
| 280 | |
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281 // Whether this region is available to be claimed, has been claimed, or has |
| 0 | 282 // been completed. |
| 283 // | |
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284 // Minor subtlety: claimed() returns true if the region is marked |
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285 // completed(), which is desirable since a region must be claimed before it |
| 0 | 286 // can be completed. |
| 287 bool available() const { return _dc_and_los < dc_one; } | |
| 288 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
| 289 bool completed() const { return _dc_and_los >= dc_completed; } | |
| 290 | |
| 291 // These are not atomic. | |
| 292 void set_destination(HeapWord* addr) { _destination = addr; } | |
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293 void set_source_region(size_t region) { _source_region = region; } |
| 0 | 294 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
| 295 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
| 296 void set_partial_obj_size(size_t words) { | |
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297 _partial_obj_size = (region_sz_t) words; |
| 0 | 298 } |
| 299 | |
| 300 inline void set_destination_count(uint count); | |
| 301 inline void set_live_obj_size(size_t words); | |
| 302 inline void set_data_location(HeapWord* addr); | |
| 303 inline void set_completed(); | |
| 304 inline bool claim_unsafe(); | |
| 305 | |
| 306 // These are atomic. | |
| 307 inline void add_live_obj(size_t words); | |
| 308 inline void set_highest_ref(HeapWord* addr); | |
| 309 inline void decrement_destination_count(); | |
| 310 inline bool claim(); | |
| 311 | |
| 312 private: | |
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313 // The type used to represent object sizes within a region. |
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314 typedef uint region_sz_t; |
| 0 | 315 |
| 316 // Constants for manipulating the _dc_and_los field, which holds both the | |
| 317 // destination count and live obj size. The live obj size lives at the | |
| 318 // least significant end so no masking is necessary when adding. | |
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319 static const region_sz_t dc_shift; // Shift amount. |
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320 static const region_sz_t dc_mask; // Mask for destination count. |
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321 static const region_sz_t dc_one; // 1, shifted appropriately. |
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322 static const region_sz_t dc_claimed; // Region has been claimed. |
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323 static const region_sz_t dc_completed; // Region has been completed. |
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324 static const region_sz_t los_mask; // Mask for live obj size. |
| 0 | 325 |
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326 HeapWord* _destination; |
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327 size_t _source_region; |
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328 HeapWord* _partial_obj_addr; |
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329 region_sz_t _partial_obj_size; |
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330 region_sz_t volatile _dc_and_los; |
| 0 | 331 #ifdef ASSERT |
| 332 // These enable optimizations that are only partially implemented. Use | |
| 333 // debug builds to prevent the code fragments from breaking. | |
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334 HeapWord* _data_location; |
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335 HeapWord* _highest_ref; |
| 0 | 336 #endif // #ifdef ASSERT |
| 337 | |
| 338 #ifdef ASSERT | |
| 339 public: | |
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340 uint _pushed; // 0 until region is pushed onto a worker's stack |
| 0 | 341 private: |
| 342 #endif | |
| 343 }; | |
| 344 | |
| 345 public: | |
| 346 ParallelCompactData(); | |
| 347 bool initialize(MemRegion covered_region); | |
| 348 | |
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349 size_t region_count() const { return _region_count; } |
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350 size_t reserved_byte_size() const { return _reserved_byte_size; } |
| 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 #ifdef ASSERT | |
| 409 void verify_clear(const PSVirtualSpace* vspace); | |
| 410 void verify_clear(); | |
| 411 #endif // #ifdef ASSERT | |
| 412 | |
| 413 private: | |
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414 bool initialize_region_data(size_t region_size); |
| 0 | 415 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
| 416 | |
| 417 private: | |
| 418 HeapWord* _region_start; | |
| 419 #ifdef ASSERT | |
| 420 HeapWord* _region_end; | |
| 421 #endif // #ifdef ASSERT | |
| 422 | |
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423 PSVirtualSpace* _region_vspace; |
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424 size_t _reserved_byte_size; |
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425 RegionData* _region_data; |
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426 size_t _region_count; |
| 0 | 427 }; |
| 428 | |
| 429 inline uint | |
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430 ParallelCompactData::RegionData::destination_count_raw() const |
| 0 | 431 { |
| 432 return _dc_and_los & dc_mask; | |
| 433 } | |
| 434 | |
| 435 inline uint | |
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436 ParallelCompactData::RegionData::destination_count() const |
| 0 | 437 { |
| 438 return destination_count_raw() >> dc_shift; | |
| 439 } | |
| 440 | |
| 441 inline void | |
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442 ParallelCompactData::RegionData::set_destination_count(uint count) |
| 0 | 443 { |
| 444 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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445 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
| 0 | 446 _dc_and_los = (count << dc_shift) | live_sz; |
| 447 } | |
| 448 | |
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449 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
| 0 | 450 { |
| 451 assert(words <= los_mask, "would overflow"); | |
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452 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
| 0 | 453 } |
| 454 | |
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455 inline void ParallelCompactData::RegionData::decrement_destination_count() |
| 0 | 456 { |
| 457 assert(_dc_and_los < dc_claimed, "already claimed"); | |
| 458 assert(_dc_and_los >= dc_one, "count would go negative"); | |
| 459 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
| 460 } | |
| 461 | |
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462 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
| 0 | 463 { |
| 464 DEBUG_ONLY(return _data_location;) | |
| 465 NOT_DEBUG(return NULL;) | |
| 466 } | |
| 467 | |
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468 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
| 0 | 469 { |
| 470 DEBUG_ONLY(return _highest_ref;) | |
| 471 NOT_DEBUG(return NULL;) | |
| 472 } | |
| 473 | |
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474 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
| 0 | 475 { |
| 476 DEBUG_ONLY(_data_location = addr;) | |
| 477 } | |
| 478 | |
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479 inline void ParallelCompactData::RegionData::set_completed() |
| 0 | 480 { |
| 481 assert(claimed(), "must be claimed first"); | |
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482 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
| 0 | 483 } |
| 484 | |
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485 // MT-unsafe claiming of a region. Should only be used during single threaded |
| 0 | 486 // execution. |
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487 inline bool ParallelCompactData::RegionData::claim_unsafe() |
| 0 | 488 { |
| 489 if (available()) { | |
| 490 _dc_and_los |= dc_claimed; | |
| 491 return true; | |
| 492 } | |
| 493 return false; | |
| 494 } | |
| 495 | |
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496 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
| 0 | 497 { |
| 498 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
| 499 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
| 500 } | |
| 501 | |
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502 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
| 0 | 503 { |
| 504 #ifdef ASSERT | |
| 505 HeapWord* tmp = _highest_ref; | |
| 506 while (addr > tmp) { | |
| 507 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
| 508 } | |
| 509 #endif // #ifdef ASSERT | |
| 510 } | |
| 511 | |
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512 inline bool ParallelCompactData::RegionData::claim() |
| 0 | 513 { |
| 514 const int los = (int) live_obj_size(); | |
| 515 const int old = Atomic::cmpxchg(dc_claimed | los, | |
| 516 (volatile int*) &_dc_and_los, los); | |
| 517 return old == los; | |
| 518 } | |
| 519 | |
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520 inline ParallelCompactData::RegionData* |
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521 ParallelCompactData::region(size_t region_idx) const |
| 0 | 522 { |
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523 assert(region_idx <= region_count(), "bad arg"); |
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524 return _region_data + region_idx; |
| 0 | 525 } |
| 526 | |
| 527 inline size_t | |
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528 ParallelCompactData::region(const RegionData* const region_ptr) const |
| 0 | 529 { |
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530 assert(region_ptr >= _region_data, "bad arg"); |
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531 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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532 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
| 0 | 533 } |
| 534 | |
| 535 inline size_t | |
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536 ParallelCompactData::region_offset(const HeapWord* addr) const |
| 0 | 537 { |
| 538 assert(addr >= _region_start, "bad addr"); | |
| 539 assert(addr <= _region_end, "bad addr"); | |
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540 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
| 0 | 541 } |
| 542 | |
| 543 inline size_t | |
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544 ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
| 0 | 545 { |
| 546 assert(addr >= _region_start, "bad addr"); | |
| 547 assert(addr <= _region_end, "bad addr"); | |
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548 return pointer_delta(addr, _region_start) >> Log2RegionSize; |
| 0 | 549 } |
| 550 | |
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551 inline ParallelCompactData::RegionData* |
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552 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
| 0 | 553 { |
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554 return region(addr_to_region_idx(addr)); |
| 0 | 555 } |
| 556 | |
| 557 inline HeapWord* | |
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558 ParallelCompactData::region_to_addr(size_t region) const |
| 0 | 559 { |
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560 assert(region <= _region_count, "region out of range"); |
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561 return _region_start + (region << Log2RegionSize); |
| 0 | 562 } |
| 563 | |
| 564 inline HeapWord* | |
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565 ParallelCompactData::region_to_addr(const RegionData* region) const |
| 0 | 566 { |
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567 return region_to_addr(pointer_delta(region, _region_data, |
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568 sizeof(RegionData))); |
| 0 | 569 } |
| 570 | |
| 571 inline HeapWord* | |
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572 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
| 0 | 573 { |
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574 assert(region <= _region_count, "region out of range"); |
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575 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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576 return region_to_addr(region) + offset; |
| 0 | 577 } |
| 578 | |
| 579 inline HeapWord* | |
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580 ParallelCompactData::region_align_down(HeapWord* addr) const |
| 0 | 581 { |
| 582 assert(addr >= _region_start, "bad addr"); | |
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583 assert(addr < _region_end + RegionSize, "bad addr"); |
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584 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
| 0 | 585 } |
| 586 | |
| 587 inline HeapWord* | |
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588 ParallelCompactData::region_align_up(HeapWord* addr) const |
| 0 | 589 { |
| 590 assert(addr >= _region_start, "bad addr"); | |
| 591 assert(addr <= _region_end, "bad addr"); | |
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592 return region_align_down(addr + RegionSizeOffsetMask); |
| 0 | 593 } |
| 594 | |
| 595 inline bool | |
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596 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
| 0 | 597 { |
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598 return region_offset(addr) == 0; |
| 0 | 599 } |
| 600 | |
| 601 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the | |
| 602 // do_addr() method. | |
| 603 // | |
| 604 // The closure is initialized with the number of heap words to process | |
| 605 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
| 606 // methods in subclasses should update the total as words are processed. Since | |
| 607 // only one subclass actually uses this mechanism to terminate iteration, the | |
| 608 // default initial value is > 0. The implementation is here and not in the | |
| 609 // single subclass that uses it to avoid making is_full() virtual, and thus | |
| 610 // adding a virtual call per live object. | |
| 611 | |
| 612 class ParMarkBitMapClosure: public StackObj { | |
| 613 public: | |
| 614 typedef ParMarkBitMap::idx_t idx_t; | |
| 615 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
| 616 | |
| 617 public: | |
| 618 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
| 619 size_t words = max_uintx); | |
| 620 | |
| 621 inline ParCompactionManager* compaction_manager() const; | |
| 622 inline ParMarkBitMap* bitmap() const; | |
| 623 inline size_t words_remaining() const; | |
| 624 inline bool is_full() const; | |
| 625 inline HeapWord* source() const; | |
| 626 | |
| 627 inline void set_source(HeapWord* addr); | |
| 628 | |
| 629 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
| 630 | |
| 631 protected: | |
| 632 inline void decrement_words_remaining(size_t words); | |
| 633 | |
| 634 private: | |
| 635 ParMarkBitMap* const _bitmap; | |
| 636 ParCompactionManager* const _compaction_manager; | |
| 637 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
| 638 size_t _words_remaining; // Words left to copy. | |
| 639 | |
| 640 protected: | |
| 641 HeapWord* _source; // Next addr that would be read. | |
| 642 }; | |
| 643 | |
| 644 inline | |
| 645 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
| 646 ParCompactionManager* cm, | |
| 647 size_t words): | |
| 648 _bitmap(bitmap), _compaction_manager(cm) | |
| 649 #ifdef ASSERT | |
| 650 , _initial_words_remaining(words) | |
| 651 #endif | |
| 652 { | |
| 653 _words_remaining = words; | |
| 654 _source = NULL; | |
| 655 } | |
| 656 | |
| 657 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
| 658 return _compaction_manager; | |
| 659 } | |
| 660 | |
| 661 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
| 662 return _bitmap; | |
| 663 } | |
| 664 | |
| 665 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
| 666 return _words_remaining; | |
| 667 } | |
| 668 | |
| 669 inline bool ParMarkBitMapClosure::is_full() const { | |
| 670 return words_remaining() == 0; | |
| 671 } | |
| 672 | |
| 673 inline HeapWord* ParMarkBitMapClosure::source() const { | |
| 674 return _source; | |
| 675 } | |
| 676 | |
| 677 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
| 678 _source = addr; | |
| 679 } | |
| 680 | |
| 681 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
| 682 assert(_words_remaining >= words, "processed too many words"); | |
| 683 _words_remaining -= words; | |
| 684 } | |
| 685 | |
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686 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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687 // does parts of the collection using parallel threads. The collection includes |
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688 // the tenured generation and the young generation. The permanent generation is |
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689 // collected at the same time as the other two generations but the permanent |
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690 // generation is collect by a single GC thread. The permanent generation is |
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691 // collected serially because of the requirement that during the processing of a |
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692 // klass AAA, any objects reference by AAA must already have been processed. |
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693 // This requirement is enforced by a left (lower address) to right (higher |
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694 // address) sliding compaction. |
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695 // |
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696 // There are four phases of the collection. |
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697 // |
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698 // - marking phase |
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699 // - summary phase |
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700 // - compacting phase |
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701 // - clean up phase |
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702 // |
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703 // Roughly speaking these phases correspond, respectively, to |
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704 // - mark all the live objects |
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705 // - calculate the destination of each object at the end of the collection |
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706 // - move the objects to their destination |
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707 // - update some references and reinitialize some variables |
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708 // |
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709 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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710 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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711 // complete marking of the heap. The summary phase is implemented in |
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712 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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713 // in PSParallelCompact::compact(). |
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714 // |
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715 // A space that is being collected is divided into regions and with each region |
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716 // is associated an object of type ParallelCompactData. Each region is of a |
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717 // fixed size and typically will contain more than 1 object and may have parts |
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718 // of objects at the front and back of the region. |
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719 // |
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720 // region -----+---------------------+---------- |
|
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721 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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722 // |
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723 // The marking phase does a complete marking of all live objects in the heap. |
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724 // The marking also compiles the size of the data for all live objects covered |
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725 // by the region. This size includes the part of any live object spanning onto |
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726 // the region (part of AAA if it is live) from the front, all live objects |
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727 // contained in the region (BBB and/or CCC if they are live), and the part of |
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728 // any live objects covered by the region that extends off the region (part of |
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729 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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730 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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731 // done atomically as is the accumulation of the size of the live objects |
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732 // covered by a region. |
|
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733 // |
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734 // The summary phase calculates the total live data to the left of each region |
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735 // XXX. Based on that total and the bottom of the space, it can calculate the |
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736 // starting location of the live data in XXX. The summary phase calculates for |
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737 // each region XXX quantites such as |
|
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738 // |
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739 // - the amount of live data at the beginning of a region from an object |
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740 // entering the region. |
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741 // - the location of the first live data on the region |
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742 // - a count of the number of regions receiving live data from XXX. |
|
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743 // |
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744 // See ParallelCompactData for precise details. The summary phase also |
|
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745 // calculates the dense prefix for the compaction. The dense prefix is a |
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746 // portion at the beginning of the space that is not moved. The objects in the |
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747 // dense prefix do need to have their object references updated. See method |
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748 // summarize_dense_prefix(). |
|
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749 // |
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750 // The summary phase is done using 1 GC thread. |
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751 // |
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752 // The compaction phase moves objects to their new location and updates all |
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753 // references in the object. |
|
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754 // |
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755 // A current exception is that objects that cross a region boundary are moved |
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756 // but do not have their references updated. References are not updated because |
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757 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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758 // has been updated. KKK likely resides in a region to the left of the region |
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759 // containing AAA. These AAA's have there references updated at the end in a |
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760 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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761 // An alternate strategy is being investigated for this deferral of updating. |
|
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762 // |
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763 // Compaction is done on a region basis. A region that is ready to be filled is |
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764 // put on a ready list and GC threads take region off the list and fill them. A |
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765 // region is ready to be filled if it empty of live objects. Such a region may |
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766 // have been initially empty (only contained dead objects) or may have had all |
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767 // its live objects copied out already. A region that compacts into itself is |
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768 // also ready for filling. The ready list is initially filled with empty |
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769 // regions and regions compacting into themselves. There is always at least 1 |
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770 // region that can be put on the ready list. The regions are atomically added |
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771 // and removed from the ready list. |
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772 |
| 0 | 773 class PSParallelCompact : AllStatic { |
| 774 public: | |
| 775 // Convenient access to type names. | |
| 776 typedef ParMarkBitMap::idx_t idx_t; | |
|
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777 typedef ParallelCompactData::RegionData RegionData; |
| 0 | 778 |
| 779 typedef enum { | |
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780 old_space_id, eden_space_id, |
| 0 | 781 from_space_id, to_space_id, last_space_id |
| 782 } SpaceId; | |
| 783 | |
| 784 public: | |
|
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785 // Inline closure decls |
| 0 | 786 // |
| 787 class IsAliveClosure: public BoolObjectClosure { | |
| 788 public: | |
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789 virtual bool do_object_b(oop p); |
| 0 | 790 }; |
| 791 | |
| 792 class KeepAliveClosure: public OopClosure { | |
|
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793 private: |
| 0 | 794 ParCompactionManager* _compaction_manager; |
|
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795 protected: |
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796 template <class T> inline void do_oop_work(T* p); |
| 0 | 797 public: |
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798 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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799 virtual void do_oop(oop* p); |
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800 virtual void do_oop(narrowOop* p); |
| 0 | 801 }; |
| 802 | |
| 803 class FollowStackClosure: public VoidClosure { | |
|
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804 private: |
| 0 | 805 ParCompactionManager* _compaction_manager; |
| 806 public: | |
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807 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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808 virtual void do_void(); |
| 0 | 809 }; |
| 810 | |
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811 class AdjustPointerClosure: public OopClosure { |
| 0 | 812 public: |
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813 virtual void do_oop(oop* p); |
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814 virtual void do_oop(narrowOop* p); |
|
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815 // do not walk from thread stacks to the code cache on this phase |
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816 virtual void do_code_blob(CodeBlob* cb) const { } |
| 0 | 817 }; |
| 818 | |
|
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819 class AdjustKlassClosure : public KlassClosure { |
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820 public: |
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821 void do_klass(Klass* klass); |
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822 }; |
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823 |
| 0 | 824 friend class KeepAliveClosure; |
| 825 friend class FollowStackClosure; | |
| 826 friend class AdjustPointerClosure; | |
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827 friend class AdjustKlassClosure; |
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828 friend class FollowKlassClosure; |
|
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829 friend class InstanceClassLoaderKlass; |
| 0 | 830 friend class RefProcTaskProxy; |
| 831 | |
| 832 private: | |
| 833 static elapsedTimer _accumulated_time; | |
| 834 static unsigned int _total_invocations; | |
| 835 static unsigned int _maximum_compaction_gc_num; | |
| 836 static jlong _time_of_last_gc; // ms | |
| 837 static CollectorCounters* _counters; | |
| 838 static ParMarkBitMap _mark_bitmap; | |
| 839 static ParallelCompactData _summary_data; | |
| 840 static IsAliveClosure _is_alive_closure; | |
| 841 static SpaceInfo _space_info[last_space_id]; | |
| 842 static bool _print_phases; | |
| 843 static AdjustPointerClosure _adjust_pointer_closure; | |
|
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844 static AdjustKlassClosure _adjust_klass_closure; |
| 0 | 845 |
| 846 // Reference processing (used in ...follow_contents) | |
| 847 static ReferenceProcessor* _ref_processor; | |
| 848 | |
| 849 // Updated location of intArrayKlassObj. | |
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850 static Klass* _updated_int_array_klass_obj; |
| 0 | 851 |
| 852 // Values computed at initialization and used by dead_wood_limiter(). | |
| 853 static double _dwl_mean; | |
| 854 static double _dwl_std_dev; | |
| 855 static double _dwl_first_term; | |
| 856 static double _dwl_adjustment; | |
| 857 #ifdef ASSERT | |
| 858 static bool _dwl_initialized; | |
| 859 #endif // #ifdef ASSERT | |
| 860 | |
| 861 private: | |
| 862 | |
| 863 static void initialize_space_info(); | |
| 864 | |
| 865 // Return true if details about individual phases should be printed. | |
| 866 static inline bool print_phases(); | |
| 867 | |
| 868 // Clear the marking bitmap and summary data that cover the specified space. | |
| 869 static void clear_data_covering_space(SpaceId id); | |
| 870 | |
| 871 static void pre_compact(PreGCValues* pre_gc_values); | |
| 872 static void post_compact(); | |
| 873 | |
| 874 // Mark live objects | |
| 875 static void marking_phase(ParCompactionManager* cm, | |
| 876 bool maximum_heap_compaction); | |
| 877 | |
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878 template <class T> |
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879 static inline void follow_root(ParCompactionManager* cm, T* p); |
| 0 | 880 |
| 881 // Compute the dense prefix for the designated space. This is an experimental | |
| 882 // implementation currently not used in production. | |
| 883 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
| 884 bool maximum_compaction); | |
| 885 | |
| 886 // Methods used to compute the dense prefix. | |
| 887 | |
| 888 // Compute the value of the normal distribution at x = density. The mean and | |
| 889 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
| 890 static inline double normal_distribution(double density); | |
| 891 | |
| 892 // Initialize the static vars used by dead_wood_limiter(). | |
| 893 static void initialize_dead_wood_limiter(); | |
| 894 | |
| 895 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
| 896 // not reclaimed). | |
| 897 static double dead_wood_limiter(double density, size_t min_percent); | |
| 898 | |
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899 // Find the first (left-most) region in the range [beg, end) that has at least |
| 0 | 900 // dead_words of dead space to the left. The argument beg must be the first |
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901 // region in the space that is not completely live. |
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902 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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903 const RegionData* end, |
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904 size_t dead_words); |
| 0 | 905 |
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906 // Return a pointer to the first region in the range [beg, end) that is not |
| 0 | 907 // completely full. |
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908 static RegionData* first_dead_space_region(const RegionData* beg, |
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909 const RegionData* end); |
| 0 | 910 |
| 911 // Return a value indicating the benefit or 'yield' if the compacted region | |
| 912 // were to start (or equivalently if the dense prefix were to end) at the | |
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913 // candidate region. Higher values are better. |
| 0 | 914 // |
| 915 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
| 916 // updating references in the dense prefix plus (b) copying objects and | |
| 917 // updating references in the compacted region. | |
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918 static inline double reclaimed_ratio(const RegionData* const candidate, |
| 0 | 919 HeapWord* const bottom, |
| 920 HeapWord* const top, | |
| 921 HeapWord* const new_top); | |
| 922 | |
| 923 // Compute the dense prefix for the designated space. | |
| 924 static HeapWord* compute_dense_prefix(const SpaceId id, | |
| 925 bool maximum_compaction); | |
| 926 | |
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927 // Return true if dead space crosses onto the specified Region; bit must be |
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928 // the bit index corresponding to the first word of the Region. |
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929 static inline bool dead_space_crosses_boundary(const RegionData* region, |
| 0 | 930 idx_t bit); |
| 931 | |
| 932 // Summary phase utility routine to fill dead space (if any) at the dense | |
| 933 // prefix boundary. Should only be called if the the dense prefix is | |
| 934 // non-empty. | |
| 935 static void fill_dense_prefix_end(SpaceId id); | |
| 936 | |
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937 // Clear the summary data source_region field for the specified addresses. |
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938 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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939 |
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940 #ifndef PRODUCT |
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941 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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942 |
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943 // Fill the region [start, start + words) with live object(s). Only usable |
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944 // for the old and permanent generations. |
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945 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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946 size_t words); |
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947 // Include the new objects in the summary data. |
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948 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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949 |
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950 // Add live objects to a survivor space since it's rare that both survivors |
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951 // are non-empty. |
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952 static void provoke_split_fill_survivor(SpaceId id); |
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953 |
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954 // Add live objects and/or choose the dense prefix to provoke splitting. |
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955 static void provoke_split(bool & maximum_compaction); |
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956 #endif |
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957 |
| 0 | 958 static void summarize_spaces_quick(); |
| 959 static void summarize_space(SpaceId id, bool maximum_compaction); | |
| 960 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
| 961 | |
| 962 // Adjust addresses in roots. Does not adjust addresses in heap. | |
| 963 static void adjust_roots(); | |
| 964 | |
| 965 // Move objects to new locations. | |
| 966 static void compact_perm(ParCompactionManager* cm); | |
| 967 static void compact(); | |
| 968 | |
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969 // Add available regions to the stack and draining tasks to the task queue. |
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970 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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971 uint parallel_gc_threads); |
| 0 | 972 |
| 973 // Add dense prefix update tasks to the task queue. | |
| 974 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
| 975 uint parallel_gc_threads); | |
| 976 | |
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977 // Add region stealing tasks to the task queue. |
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978 static void enqueue_region_stealing_tasks( |
| 0 | 979 GCTaskQueue* q, |
| 980 ParallelTaskTerminator* terminator_ptr, | |
| 981 uint parallel_gc_threads); | |
| 982 | |
| 983 // If objects are left in eden after a collection, try to move the boundary | |
| 984 // and absorb them into the old gen. Returns true if eden was emptied. | |
| 985 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 986 PSYoungGen* young_gen, | |
| 987 PSOldGen* old_gen); | |
| 988 | |
| 989 // Reset time since last full gc | |
| 990 static void reset_millis_since_last_gc(); | |
| 991 | |
| 992 public: | |
| 993 class MarkAndPushClosure: public OopClosure { | |
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994 private: |
| 0 | 995 ParCompactionManager* _compaction_manager; |
| 996 public: | |
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997 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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998 virtual void do_oop(oop* p); |
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999 virtual void do_oop(narrowOop* p); |
| 0 | 1000 }; |
| 1001 | |
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1002 // The one and only place to start following the classes. |
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1003 // Should only be applied to the ClassLoaderData klasses list. |
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1004 class FollowKlassClosure : public KlassClosure { |
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1005 private: |
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1006 MarkAndPushClosure* _mark_and_push_closure; |
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1007 public: |
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1008 FollowKlassClosure(MarkAndPushClosure* mark_and_push_closure) : |
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1009 _mark_and_push_closure(mark_and_push_closure) { } |
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1010 void do_klass(Klass* klass); |
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1011 }; |
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1012 |
| 0 | 1013 PSParallelCompact(); |
| 1014 | |
| 1015 // Convenient accessor for Universe::heap(). | |
| 1016 static ParallelScavengeHeap* gc_heap() { | |
| 1017 return (ParallelScavengeHeap*)Universe::heap(); | |
| 1018 } | |
| 1019 | |
| 1020 static void invoke(bool maximum_heap_compaction); | |
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1021 static bool invoke_no_policy(bool maximum_heap_compaction); |
| 0 | 1022 |
| 1023 static void post_initialize(); | |
| 1024 // Perform initialization for PSParallelCompact that requires | |
| 1025 // allocations. This should be called during the VM initialization | |
| 1026 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
| 1027 // in the event of a failure. | |
| 1028 static bool initialize(); | |
| 1029 | |
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1030 // Closure accessors |
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1031 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
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1032 static KlassClosure* adjust_klass_closure() { return (KlassClosure*)&_adjust_klass_closure; } |
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1033 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
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1034 |
| 0 | 1035 // Public accessors |
| 1036 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
| 1037 static unsigned int total_invocations() { return _total_invocations; } | |
| 1038 static CollectorCounters* counters() { return _counters; } | |
| 1039 | |
| 1040 // Used to add tasks | |
| 1041 static GCTaskManager* const gc_task_manager(); | |
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1042 static Klass* updated_int_array_klass_obj() { |
| 0 | 1043 return _updated_int_array_klass_obj; |
| 1044 } | |
| 1045 | |
| 1046 // Marking support | |
| 1047 static inline bool mark_obj(oop obj); | |
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1048 static inline bool is_marked(oop obj); |
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1049 // Check mark and maybe push on marking stack |
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1050 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1051 T* p); |
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1052 template <class T> static inline void adjust_pointer(T* p); |
| 0 | 1053 |
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1054 static void follow_klass(ParCompactionManager* cm, Klass* klass); |
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1055 static void adjust_klass(ParCompactionManager* cm, Klass* klass); |
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1056 |
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1057 static void follow_class_loader(ParCompactionManager* cm, |
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1058 ClassLoaderData* klass); |
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1059 static void adjust_class_loader(ParCompactionManager* cm, |
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1060 ClassLoaderData* klass); |
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1061 |
| 0 | 1062 // Compaction support. |
| 1063 // Return true if p is in the range [beg_addr, end_addr). | |
| 1064 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
| 1065 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
| 1066 | |
| 1067 // Convenience wrappers for per-space data kept in _space_info. | |
| 1068 static inline MutableSpace* space(SpaceId space_id); | |
| 1069 static inline HeapWord* new_top(SpaceId space_id); | |
| 1070 static inline HeapWord* dense_prefix(SpaceId space_id); | |
| 1071 static inline ObjectStartArray* start_array(SpaceId space_id); | |
| 1072 | |
| 1073 // Move and update the live objects in the specified space. | |
| 1074 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
| 1075 | |
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1076 // Process the end of the given region range in the dense prefix. |
| 0 | 1077 // This includes saving any object not updated. |
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1078 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1079 size_t region_start_index, |
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1080 size_t region_end_index, |
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1081 idx_t exiting_object_offset, |
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1082 idx_t region_offset_start, |
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1083 idx_t region_offset_end); |
| 0 | 1084 |
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1085 // Update a region in the dense prefix. For each live object |
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1086 // in the region, update it's interior references. For each |
| 0 | 1087 // dead object, fill it with deadwood. Dead space at the end |
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1088 // of a region range will be filled to the start of the next |
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1089 // live object regardless of the region_index_end. None of the |
| 0 | 1090 // objects in the dense prefix move and dead space is dead |
| 1091 // (holds only dead objects that don't need any processing), so | |
| 1092 // dead space can be filled in any order. | |
| 1093 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
| 1094 SpaceId space_id, | |
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1095 size_t region_index_start, |
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1096 size_t region_index_end); |
| 0 | 1097 |
| 1098 // Return the address of the count + 1st live word in the range [beg, end). | |
| 1099 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
| 1100 | |
| 1101 // Return the address of the word to be copied to dest_addr, which must be | |
|
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1102 // aligned to a region boundary. |
| 0 | 1103 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
|
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1104 SpaceId src_space_id, |
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1105 size_t src_region_idx); |
| 0 | 1106 |
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1107 // Determine the next source region, set closure.source() to the start of the |
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1108 // new region return the region index. Parameter end_addr is the address one |
| 0 | 1109 // beyond the end of source range just processed. If necessary, switch to a |
| 1110 // new source space and set src_space_id (in-out parameter) and src_space_top | |
| 1111 // (out parameter) accordingly. | |
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1112 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1113 SpaceId& src_space_id, |
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1114 HeapWord*& src_space_top, |
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1115 HeapWord* end_addr); |
| 0 | 1116 |
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1117 // Decrement the destination count for each non-empty source region in the |
|
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1118 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1119 // count for a region goes to 0 and it needs to be filled, enqueue it. |
| 0 | 1120 static void decrement_destination_counts(ParCompactionManager* cm, |
|
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1121 SpaceId src_space_id, |
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1122 size_t beg_region, |
| 0 | 1123 HeapWord* end_addr); |
| 1124 | |
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1125 // Fill a region, copying objects from one or more source regions. |
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1126 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1127 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1128 fill_region(cm, region); |
| 0 | 1129 } |
| 1130 | |
| 1131 // Update the deferred objects in the space. | |
| 1132 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
| 1133 | |
| 1134 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
| 1135 static ParallelCompactData& summary_data() { return _summary_data; } | |
| 1136 | |
| 1137 // Reference Processing | |
| 1138 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
| 1139 | |
| 1140 // Return the SpaceId for the given address. | |
| 1141 static SpaceId space_id(HeapWord* addr); | |
| 1142 | |
| 1143 // Time since last full gc (in milliseconds). | |
| 1144 static jlong millis_since_last_gc(); | |
| 1145 | |
|
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1146 static void print_on_error(outputStream* st); |
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1147 |
| 0 | 1148 #ifndef PRODUCT |
| 1149 // Debugging support. | |
| 1150 static const char* space_names[last_space_id]; | |
|
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1151 static void print_region_ranges(); |
| 0 | 1152 static void print_dense_prefix_stats(const char* const algorithm, |
| 1153 const SpaceId id, | |
| 1154 const bool maximum_compaction, | |
| 1155 HeapWord* const addr); | |
|
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1156 static void summary_phase_msg(SpaceId dst_space_id, |
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1157 HeapWord* dst_beg, HeapWord* dst_end, |
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1158 SpaceId src_space_id, |
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1159 HeapWord* src_beg, HeapWord* src_end); |
| 0 | 1160 #endif // #ifndef PRODUCT |
| 1161 | |
| 1162 #ifdef ASSERT | |
|
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1163 // Sanity check the new location of a word in the heap. |
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1164 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1165 // Verify that all the regions have been emptied. |
| 0 | 1166 static void verify_complete(SpaceId space_id); |
| 1167 #endif // #ifdef ASSERT | |
| 1168 }; | |
| 1169 | |
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1170 inline bool PSParallelCompact::mark_obj(oop obj) { |
| 0 | 1171 const int obj_size = obj->size(); |
| 1172 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
| 1173 _summary_data.add_obj(obj, obj_size); | |
| 1174 return true; | |
| 1175 } else { | |
| 1176 return false; | |
| 1177 } | |
| 1178 } | |
| 1179 | |
|
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1180 inline bool PSParallelCompact::is_marked(oop obj) { |
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1181 return mark_bitmap()->is_marked(obj); |
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1182 } |
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1183 |
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1184 template <class T> |
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1185 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1186 assert(!Universe::heap()->is_in_reserved(p), |
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1187 "roots shouldn't be things within the heap"); |
|
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1188 |
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1189 T heap_oop = oopDesc::load_heap_oop(p); |
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1190 if (!oopDesc::is_null(heap_oop)) { |
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1191 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1192 if (mark_bitmap()->is_unmarked(obj)) { |
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1193 if (mark_obj(obj)) { |
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1194 obj->follow_contents(cm); |
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1195 } |
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1196 } |
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1197 } |
|
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1198 cm->follow_marking_stacks(); |
|
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1199 } |
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1200 |
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1201 template <class T> |
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1202 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1203 T heap_oop = oopDesc::load_heap_oop(p); |
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1204 if (!oopDesc::is_null(heap_oop)) { |
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1205 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 1638 | 1206 if (mark_bitmap()->is_unmarked(obj) && mark_obj(obj)) { |
| 1207 cm->push(obj); | |
|
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1208 } |
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1209 } |
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1210 } |
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1211 |
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1212 template <class T> |
|
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1213 inline void PSParallelCompact::adjust_pointer(T* p) { |
|
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1214 T heap_oop = oopDesc::load_heap_oop(p); |
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1215 if (!oopDesc::is_null(heap_oop)) { |
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1216 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1217 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
|
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1218 assert(new_obj != NULL, // is forwarding ptr? |
|
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1219 "should be forwarded"); |
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1220 // Just always do the update unconditionally? |
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1221 if (new_obj != NULL) { |
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1222 assert(Universe::heap()->is_in_reserved(new_obj), |
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1223 "should be in object space"); |
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1224 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1225 } |
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1226 } |
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1227 } |
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1228 |
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1229 template <class T> |
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1230 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1231 mark_and_push(_compaction_manager, p); |
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1232 } |
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1233 |
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1234 inline bool PSParallelCompact::print_phases() { |
| 0 | 1235 return _print_phases; |
| 1236 } | |
| 1237 | |
|
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1238 inline double PSParallelCompact::normal_distribution(double density) { |
| 0 | 1239 assert(_dwl_initialized, "uninitialized"); |
| 1240 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
| 1241 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
| 1242 } | |
| 1243 | |
| 1244 inline bool | |
|
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1245 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
| 0 | 1246 idx_t bit) |
| 1247 { | |
|
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1248 assert(bit > 0, "cannot call this for the first bit/region"); |
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1249 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
| 0 | 1250 "sanity check"); |
| 1251 | |
| 1252 // Dead space crosses the boundary if (1) a partial object does not extend | |
|
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1253 // onto the region, (2) an object does not start at the beginning of the |
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1254 // region, and (3) an object does not end at the end of the prior region. |
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1255 return region->partial_obj_size() == 0 && |
| 0 | 1256 !_mark_bitmap.is_obj_beg(bit) && |
| 1257 !_mark_bitmap.is_obj_end(bit - 1); | |
| 1258 } | |
| 1259 | |
| 1260 inline bool | |
| 1261 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
| 1262 return p >= beg_addr && p < end_addr; | |
| 1263 } | |
| 1264 | |
| 1265 inline bool | |
| 1266 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
| 1267 return is_in((HeapWord*)p, beg_addr, end_addr); | |
| 1268 } | |
| 1269 | |
| 1270 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
| 1271 assert(id < last_space_id, "id out of range"); | |
| 1272 return _space_info[id].space(); | |
| 1273 } | |
| 1274 | |
| 1275 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
| 1276 assert(id < last_space_id, "id out of range"); | |
| 1277 return _space_info[id].new_top(); | |
| 1278 } | |
| 1279 | |
| 1280 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
| 1281 assert(id < last_space_id, "id out of range"); | |
| 1282 return _space_info[id].dense_prefix(); | |
| 1283 } | |
| 1284 | |
| 1285 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
| 1286 assert(id < last_space_id, "id out of range"); | |
| 1287 return _space_info[id].start_array(); | |
| 1288 } | |
| 1289 | |
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1290 #ifdef ASSERT |
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1291 inline void |
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1292 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1293 { |
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1294 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1295 "must move left or to a different space"); |
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1296 assert(is_object_aligned((intptr_t)old_addr) && is_object_aligned((intptr_t)new_addr), |
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1297 "checking alignment"); |
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1298 } |
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1299 #endif // ASSERT |
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1300 |
| 0 | 1301 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
| 1302 public: | |
| 1303 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
| 1304 ObjectStartArray* start_array, | |
| 1305 HeapWord* destination, size_t words); | |
| 1306 | |
| 1307 // Accessors. | |
| 1308 HeapWord* destination() const { return _destination; } | |
| 1309 | |
| 1310 // If the object will fit (size <= words_remaining()), copy it to the current | |
| 1311 // destination, update the interior oops and the start array and return either | |
| 1312 // full (if the closure is full) or incomplete. If the object will not fit, | |
| 1313 // return would_overflow. | |
| 1314 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
| 1315 | |
| 1316 // Copy enough words to fill this closure, starting at source(). Interior | |
| 1317 // oops and the start array are not updated. Return full. | |
| 1318 IterationStatus copy_until_full(); | |
| 1319 | |
| 1320 // Copy enough words to fill this closure or to the end of an object, | |
| 1321 // whichever is smaller, starting at source(). Interior oops and the start | |
| 1322 // array are not updated. | |
| 1323 void copy_partial_obj(); | |
| 1324 | |
| 1325 protected: | |
| 1326 // Update variables to indicate that word_count words were processed. | |
| 1327 inline void update_state(size_t word_count); | |
| 1328 | |
| 1329 protected: | |
| 1330 ObjectStartArray* const _start_array; | |
| 1331 HeapWord* _destination; // Next addr to be written. | |
| 1332 }; | |
| 1333 | |
| 1334 inline | |
| 1335 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
| 1336 ParCompactionManager* cm, | |
| 1337 ObjectStartArray* start_array, | |
| 1338 HeapWord* destination, | |
| 1339 size_t words) : | |
| 1340 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
| 1341 { | |
| 1342 _destination = destination; | |
| 1343 } | |
| 1344 | |
| 1345 inline void MoveAndUpdateClosure::update_state(size_t words) | |
| 1346 { | |
| 1347 decrement_words_remaining(words); | |
| 1348 _source += words; | |
| 1349 _destination += words; | |
| 1350 } | |
| 1351 | |
| 1352 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
| 1353 private: | |
| 1354 const PSParallelCompact::SpaceId _space_id; | |
| 1355 ObjectStartArray* const _start_array; | |
| 1356 | |
| 1357 public: | |
| 1358 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
| 1359 ParCompactionManager* cm, | |
| 1360 PSParallelCompact::SpaceId space_id); | |
| 1361 | |
| 1362 // Update the object. | |
| 1363 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
| 1364 | |
| 1365 inline void do_addr(HeapWord* addr); | |
| 1366 }; | |
| 1367 | |
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1368 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1369 { |
| 0 | 1370 _start_array->allocate_block(addr); |
| 1371 oop(addr)->update_contents(compaction_manager()); | |
| 1372 } | |
| 1373 | |
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1374 class FillClosure: public ParMarkBitMapClosure |
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1375 { |
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1376 public: |
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1377 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
| 0 | 1378 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
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1379 _start_array(PSParallelCompact::start_array(space_id)) |
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1380 { |
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1381 assert(space_id == PSParallelCompact::old_space_id, |
| 0 | 1382 "cannot use FillClosure in the young gen"); |
| 1383 } | |
| 1384 | |
| 1385 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
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1386 CollectedHeap::fill_with_objects(addr, size); |
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1387 HeapWord* const end = addr + size; |
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1388 do { |
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1389 _start_array->allocate_block(addr); |
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1390 addr += oop(addr)->size(); |
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1391 } while (addr < end); |
| 0 | 1392 return ParMarkBitMap::incomplete; |
| 1393 } | |
| 1394 | |
| 1395 private: | |
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1396 ObjectStartArray* const _start_array; |
| 0 | 1397 }; |
| 1972 | 1398 |
| 1399 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |