Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
29 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
30 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" | |
31 #include "gc_implementation/shared/collectorCounters.hpp" | |
32 #include "gc_implementation/shared/markSweep.hpp" | |
33 #include "gc_implementation/shared/mutableSpace.hpp" | |
34 #include "memory/sharedHeap.hpp" | |
35 #include "oops/oop.hpp" | |
36 | |
0 | 37 class ParallelScavengeHeap; |
38 class PSAdaptiveSizePolicy; | |
39 class PSYoungGen; | |
40 class PSOldGen; | |
41 class ParCompactionManager; | |
42 class ParallelTaskTerminator; | |
43 class PSParallelCompact; | |
44 class GCTaskManager; | |
45 class GCTaskQueue; | |
46 class PreGCValues; | |
47 class MoveAndUpdateClosure; | |
48 class RefProcTaskExecutor; | |
10405 | 49 class ParallelOldTracer; |
50 class STWGCTimer; | |
0 | 51 |
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52 // The SplitInfo class holds the information needed to 'split' a source region |
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53 // so that the live data can be copied to two destination *spaces*. Normally, |
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54 // all the live data in a region is copied to a single destination space (e.g., |
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55 // everything live in a region in eden is copied entirely into the old gen). |
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56 // However, when the heap is nearly full, all the live data in eden may not fit |
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57 // into the old gen. Copying only some of the regions from eden to old gen |
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58 // requires finding a region that does not contain a partial object (i.e., no |
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59 // live object crosses the region boundary) somewhere near the last object that |
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60 // does fit into the old gen. Since it's not always possible to find such a |
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61 // region, splitting is necessary for predictable behavior. |
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62 // |
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63 // A region is always split at the end of the partial object. This avoids |
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64 // additional tests when calculating the new location of a pointer, which is a |
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65 // very hot code path. The partial object and everything to its left will be |
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66 // copied to another space (call it dest_space_1). The live data to the right |
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67 // of the partial object will be copied either within the space itself, or to a |
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68 // different destination space (distinct from dest_space_1). |
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69 // |
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70 // Split points are identified during the summary phase, when region |
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71 // destinations are computed: data about the split, including the |
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72 // partial_object_size, is recorded in a SplitInfo record and the |
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73 // partial_object_size field in the summary data is set to zero. The zeroing is |
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74 // possible (and necessary) since the partial object will move to a different |
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75 // destination space than anything to its right, thus the partial object should |
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76 // not affect the locations of any objects to its right. |
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77 // |
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78 // The recorded data is used during the compaction phase, but only rarely: when |
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79 // the partial object on the split region will be copied across a destination |
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80 // region boundary. This test is made once each time a region is filled, and is |
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81 // a simple address comparison, so the overhead is negligible (see |
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82 // PSParallelCompact::first_src_addr()). |
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83 // |
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84 // Notes: |
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85 // |
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86 // Only regions with partial objects are split; a region without a partial |
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87 // object does not need any extra bookkeeping. |
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88 // |
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89 // At most one region is split per space, so the amount of data required is |
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90 // constant. |
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91 // |
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92 // A region is split only when the destination space would overflow. Once that |
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93 // happens, the destination space is abandoned and no other data (even from |
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94 // other source spaces) is targeted to that destination space. Abandoning the |
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95 // destination space may leave a somewhat large unused area at the end, if a |
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96 // large object caused the overflow. |
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97 // |
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98 // Future work: |
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99 // |
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100 // More bookkeeping would be required to continue to use the destination space. |
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101 // The most general solution would allow data from regions in two different |
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102 // source spaces to be "joined" in a single destination region. At the very |
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103 // least, additional code would be required in next_src_region() to detect the |
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104 // join and skip to an out-of-order source region. If the join region was also |
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105 // the last destination region to which a split region was copied (the most |
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106 // likely case), then additional work would be needed to get fill_region() to |
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107 // stop iteration and switch to a new source region at the right point. Basic |
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108 // idea would be to use a fake value for the top of the source space. It is |
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109 // doable, if a bit tricky. |
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110 // |
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111 // A simpler (but less general) solution would fill the remainder of the |
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112 // destination region with a dummy object and continue filling the next |
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113 // destination region. |
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114 |
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115 class SplitInfo |
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116 { |
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117 public: |
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118 // Return true if this split info is valid (i.e., if a split has been |
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119 // recorded). The very first region cannot have a partial object and thus is |
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120 // never split, so 0 is the 'invalid' value. |
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121 bool is_valid() const { return _src_region_idx > 0; } |
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122 |
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123 // Return true if this split holds data for the specified source region. |
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124 inline bool is_split(size_t source_region) const; |
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125 |
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126 // The index of the split region, the size of the partial object on that |
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127 // region and the destination of the partial object. |
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128 size_t src_region_idx() const { return _src_region_idx; } |
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129 size_t partial_obj_size() const { return _partial_obj_size; } |
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130 HeapWord* destination() const { return _destination; } |
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131 |
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132 // The destination count of the partial object referenced by this split |
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133 // (either 1 or 2). This must be added to the destination count of the |
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134 // remainder of the source region. |
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135 unsigned int destination_count() const { return _destination_count; } |
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136 |
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137 // If a word within the partial object will be written to the first word of a |
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138 // destination region, this is the address of the destination region; |
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139 // otherwise this is NULL. |
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140 HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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141 |
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142 // If a word within the partial object will be written to the first word of a |
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143 // destination region, this is the address of that word within the partial |
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144 // object; otherwise this is NULL. |
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145 HeapWord* first_src_addr() const { return _first_src_addr; } |
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146 |
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147 // Record the data necessary to split the region src_region_idx. |
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148 void record(size_t src_region_idx, size_t partial_obj_size, |
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149 HeapWord* destination); |
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150 |
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151 void clear(); |
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152 |
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153 DEBUG_ONLY(void verify_clear();) |
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154 |
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155 private: |
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156 size_t _src_region_idx; |
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157 size_t _partial_obj_size; |
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158 HeapWord* _destination; |
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159 unsigned int _destination_count; |
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160 HeapWord* _dest_region_addr; |
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161 HeapWord* _first_src_addr; |
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162 }; |
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163 |
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164 inline bool SplitInfo::is_split(size_t region_idx) const |
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165 { |
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166 return _src_region_idx == region_idx && is_valid(); |
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167 } |
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168 |
0 | 169 class SpaceInfo |
170 { | |
171 public: | |
172 MutableSpace* space() const { return _space; } | |
173 | |
174 // Where the free space will start after the collection. Valid only after the | |
175 // summary phase completes. | |
176 HeapWord* new_top() const { return _new_top; } | |
177 | |
178 // Allows new_top to be set. | |
179 HeapWord** new_top_addr() { return &_new_top; } | |
180 | |
181 // Where the smallest allowable dense prefix ends (used only for perm gen). | |
182 HeapWord* min_dense_prefix() const { return _min_dense_prefix; } | |
183 | |
184 // Where the dense prefix ends, or the compacted region begins. | |
185 HeapWord* dense_prefix() const { return _dense_prefix; } | |
186 | |
187 // The start array for the (generation containing the) space, or NULL if there | |
188 // is no start array. | |
189 ObjectStartArray* start_array() const { return _start_array; } | |
190 | |
482
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191 SplitInfo& split_info() { return _split_info; } |
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192 |
0 | 193 void set_space(MutableSpace* s) { _space = s; } |
194 void set_new_top(HeapWord* addr) { _new_top = addr; } | |
195 void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } | |
196 void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } | |
197 void set_start_array(ObjectStartArray* s) { _start_array = s; } | |
198 | |
482
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199 void publish_new_top() const { _space->set_top(_new_top); } |
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200 |
0 | 201 private: |
202 MutableSpace* _space; | |
203 HeapWord* _new_top; | |
204 HeapWord* _min_dense_prefix; | |
205 HeapWord* _dense_prefix; | |
206 ObjectStartArray* _start_array; | |
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207 SplitInfo _split_info; |
0 | 208 }; |
209 | |
210 class ParallelCompactData | |
211 { | |
212 public: | |
213 // Sizes are in HeapWords, unless indicated otherwise. | |
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214 static const size_t Log2RegionSize; |
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215 static const size_t RegionSize; |
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216 static const size_t RegionSizeBytes; |
0 | 217 |
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218 // Mask for the bits in a size_t to get an offset within a region. |
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219 static const size_t RegionSizeOffsetMask; |
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220 // Mask for the bits in a pointer to get an offset within a region. |
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221 static const size_t RegionAddrOffsetMask; |
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222 // Mask for the bits in a pointer to get the address of the start of a region. |
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223 static const size_t RegionAddrMask; |
0 | 224 |
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225 static const size_t Log2BlockSize; |
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226 static const size_t BlockSize; |
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227 static const size_t BlockSizeBytes; |
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228 |
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229 static const size_t BlockSizeOffsetMask; |
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230 static const size_t BlockAddrOffsetMask; |
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231 static const size_t BlockAddrMask; |
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232 |
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233 static const size_t BlocksPerRegion; |
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234 static const size_t Log2BlocksPerRegion; |
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235 |
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236 class RegionData |
0 | 237 { |
238 public: | |
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239 // Destination address of the region. |
0 | 240 HeapWord* destination() const { return _destination; } |
241 | |
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242 // The first region containing data destined for this region. |
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243 size_t source_region() const { return _source_region; } |
0 | 244 |
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245 // The object (if any) starting in this region and ending in a different |
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246 // region that could not be updated during the main (parallel) compaction |
0 | 247 // phase. This is different from _partial_obj_addr, which is an object that |
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248 // extends onto a source region. However, the two uses do not overlap in |
0 | 249 // time, so the same field is used to save space. |
250 HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } | |
251 | |
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252 // The starting address of the partial object extending onto the region. |
0 | 253 HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
254 | |
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255 // Size of the partial object extending onto the region (words). |
0 | 256 size_t partial_obj_size() const { return _partial_obj_size; } |
257 | |
375
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258 // Size of live data that lies within this region due to objects that start |
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259 // in this region (words). This does not include the partial object |
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260 // extending onto the region (if any), or the part of an object that extends |
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261 // onto the next region (if any). |
0 | 262 size_t live_obj_size() const { return _dc_and_los & los_mask; } |
263 | |
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264 // Total live data that lies within the region (words). |
0 | 265 size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
266 | |
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267 // The destination_count is the number of other regions to which data from |
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268 // this region will be copied. At the end of the summary phase, the valid |
0 | 269 // values of destination_count are |
270 // | |
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271 // 0 - data from the region will be compacted completely into itself, or the |
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272 // region is empty. The region can be claimed and then filled. |
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273 // 1 - data from the region will be compacted into 1 other region; some |
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274 // data from the region may also be compacted into the region itself. |
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275 // 2 - data from the region will be copied to 2 other regions. |
0 | 276 // |
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277 // During compaction as regions are emptied, the destination_count is |
0 | 278 // decremented (atomically) and when it reaches 0, it can be claimed and |
279 // then filled. | |
280 // | |
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281 // A region is claimed for processing by atomically changing the |
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282 // destination_count to the claimed value (dc_claimed). After a region has |
0 | 283 // been filled, the destination_count should be set to the completed value |
284 // (dc_completed). | |
285 inline uint destination_count() const; | |
286 inline uint destination_count_raw() const; | |
287 | |
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288 // Whether the block table for this region has been filled. |
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289 inline bool blocks_filled() const; |
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290 |
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291 // Number of times the block table was filled. |
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292 DEBUG_ONLY(inline size_t blocks_filled_count() const;) |
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293 |
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294 // The location of the java heap data that corresponds to this region. |
0 | 295 inline HeapWord* data_location() const; |
296 | |
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297 // The highest address referenced by objects in this region. |
0 | 298 inline HeapWord* highest_ref() const; |
299 | |
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300 // Whether this region is available to be claimed, has been claimed, or has |
0 | 301 // been completed. |
302 // | |
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303 // Minor subtlety: claimed() returns true if the region is marked |
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304 // completed(), which is desirable since a region must be claimed before it |
0 | 305 // can be completed. |
306 bool available() const { return _dc_and_los < dc_one; } | |
307 bool claimed() const { return _dc_and_los >= dc_claimed; } | |
308 bool completed() const { return _dc_and_los >= dc_completed; } | |
309 | |
310 // These are not atomic. | |
311 void set_destination(HeapWord* addr) { _destination = addr; } | |
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312 void set_source_region(size_t region) { _source_region = region; } |
0 | 313 void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
314 void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } | |
315 void set_partial_obj_size(size_t words) { | |
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316 _partial_obj_size = (region_sz_t) words; |
0 | 317 } |
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318 inline void set_blocks_filled(); |
0 | 319 |
320 inline void set_destination_count(uint count); | |
321 inline void set_live_obj_size(size_t words); | |
322 inline void set_data_location(HeapWord* addr); | |
323 inline void set_completed(); | |
324 inline bool claim_unsafe(); | |
325 | |
326 // These are atomic. | |
327 inline void add_live_obj(size_t words); | |
328 inline void set_highest_ref(HeapWord* addr); | |
329 inline void decrement_destination_count(); | |
330 inline bool claim(); | |
331 | |
332 private: | |
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333 // The type used to represent object sizes within a region. |
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334 typedef uint region_sz_t; |
0 | 335 |
336 // Constants for manipulating the _dc_and_los field, which holds both the | |
337 // destination count and live obj size. The live obj size lives at the | |
338 // least significant end so no masking is necessary when adding. | |
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339 static const region_sz_t dc_shift; // Shift amount. |
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340 static const region_sz_t dc_mask; // Mask for destination count. |
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341 static const region_sz_t dc_one; // 1, shifted appropriately. |
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342 static const region_sz_t dc_claimed; // Region has been claimed. |
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343 static const region_sz_t dc_completed; // Region has been completed. |
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344 static const region_sz_t los_mask; // Mask for live obj size. |
0 | 345 |
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346 HeapWord* _destination; |
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347 size_t _source_region; |
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348 HeapWord* _partial_obj_addr; |
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349 region_sz_t _partial_obj_size; |
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350 region_sz_t volatile _dc_and_los; |
23457 | 351 bool volatile _blocks_filled; |
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352 |
0 | 353 #ifdef ASSERT |
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354 size_t _blocks_filled_count; // Number of block table fills. |
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355 |
0 | 356 // These enable optimizations that are only partially implemented. Use |
357 // debug builds to prevent the code fragments from breaking. | |
375
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358 HeapWord* _data_location; |
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359 HeapWord* _highest_ref; |
0 | 360 #endif // #ifdef ASSERT |
361 | |
362 #ifdef ASSERT | |
363 public: | |
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364 uint _pushed; // 0 until region is pushed onto a stack |
0 | 365 private: |
366 #endif | |
367 }; | |
368 | |
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369 // "Blocks" allow shorter sections of the bitmap to be searched. Each Block |
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370 // holds an offset, which is the amount of live data in the Region to the left |
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371 // of the first live object that starts in the Block. |
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372 class BlockData |
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373 { |
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374 public: |
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375 typedef unsigned short int blk_ofs_t; |
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376 |
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377 blk_ofs_t offset() const { return _offset; } |
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378 void set_offset(size_t val) { _offset = (blk_ofs_t)val; } |
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379 |
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380 private: |
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381 blk_ofs_t _offset; |
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382 }; |
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383 |
0 | 384 public: |
385 ParallelCompactData(); | |
386 bool initialize(MemRegion covered_region); | |
387 | |
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388 size_t region_count() const { return _region_count; } |
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389 size_t reserved_byte_size() const { return _reserved_byte_size; } |
0 | 390 |
375
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391 // Convert region indices to/from RegionData pointers. |
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392 inline RegionData* region(size_t region_idx) const; |
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393 inline size_t region(const RegionData* const region_ptr) const; |
0 | 394 |
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395 size_t block_count() const { return _block_count; } |
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396 inline BlockData* block(size_t block_idx) const; |
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397 inline size_t block(const BlockData* block_ptr) const; |
0 | 398 |
399 void add_obj(HeapWord* addr, size_t len); | |
400 void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } | |
401 | |
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402 // Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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403 // destination of region n is simply the start of region n. The argument beg |
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404 // must be region-aligned; end need not be. |
0 | 405 void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
406 | |
482
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407 HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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408 HeapWord* destination, HeapWord* target_end, |
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409 HeapWord** target_next); |
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410 bool summarize(SplitInfo& split_info, |
0 | 411 HeapWord* source_beg, HeapWord* source_end, |
482
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412 HeapWord** source_next, |
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413 HeapWord* target_beg, HeapWord* target_end, |
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414 HeapWord** target_next); |
0 | 415 |
416 void clear(); | |
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417 void clear_range(size_t beg_region, size_t end_region); |
0 | 418 void clear_range(HeapWord* beg, HeapWord* end) { |
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419 clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
0 | 420 } |
421 | |
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422 // Return the number of words between addr and the start of the region |
0 | 423 // containing addr. |
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424 inline size_t region_offset(const HeapWord* addr) const; |
0 | 425 |
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426 // Convert addresses to/from a region index or region pointer. |
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427 inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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428 inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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429 inline HeapWord* region_to_addr(size_t region) const; |
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430 inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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431 inline HeapWord* region_to_addr(const RegionData* region) const; |
0 | 432 |
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433 inline HeapWord* region_align_down(HeapWord* addr) const; |
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434 inline HeapWord* region_align_up(HeapWord* addr) const; |
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435 inline bool is_region_aligned(HeapWord* addr) const; |
0 | 436 |
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437 // Analogous to region_offset() for blocks. |
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438 size_t block_offset(const HeapWord* addr) const; |
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439 size_t addr_to_block_idx(const HeapWord* addr) const; |
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440 size_t addr_to_block_idx(const oop obj) const { |
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441 return addr_to_block_idx((HeapWord*) obj); |
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442 } |
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443 inline BlockData* addr_to_block_ptr(const HeapWord* addr) const; |
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444 inline HeapWord* block_to_addr(size_t block) const; |
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445 inline size_t region_to_block_idx(size_t region) const; |
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446 |
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447 inline HeapWord* block_align_down(HeapWord* addr) const; |
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448 inline HeapWord* block_align_up(HeapWord* addr) const; |
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449 inline bool is_block_aligned(HeapWord* addr) const; |
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450 |
0 | 451 // Return the address one past the end of the partial object. |
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452 HeapWord* partial_obj_end(size_t region_idx) const; |
0 | 453 |
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454 // Return the location of the object after compaction. |
0 | 455 HeapWord* calc_new_pointer(HeapWord* addr); |
456 | |
457 HeapWord* calc_new_pointer(oop p) { | |
458 return calc_new_pointer((HeapWord*) p); | |
459 } | |
460 | |
461 #ifdef ASSERT | |
462 void verify_clear(const PSVirtualSpace* vspace); | |
463 void verify_clear(); | |
464 #endif // #ifdef ASSERT | |
465 | |
466 private: | |
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467 bool initialize_block_data(); |
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468 bool initialize_region_data(size_t region_size); |
0 | 469 PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
470 | |
471 private: | |
472 HeapWord* _region_start; | |
473 #ifdef ASSERT | |
474 HeapWord* _region_end; | |
475 #endif // #ifdef ASSERT | |
476 | |
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477 PSVirtualSpace* _region_vspace; |
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478 size_t _reserved_byte_size; |
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479 RegionData* _region_data; |
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480 size_t _region_count; |
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481 |
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482 PSVirtualSpace* _block_vspace; |
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483 BlockData* _block_data; |
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484 size_t _block_count; |
0 | 485 }; |
486 | |
487 inline uint | |
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488 ParallelCompactData::RegionData::destination_count_raw() const |
0 | 489 { |
490 return _dc_and_los & dc_mask; | |
491 } | |
492 | |
493 inline uint | |
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494 ParallelCompactData::RegionData::destination_count() const |
0 | 495 { |
496 return destination_count_raw() >> dc_shift; | |
497 } | |
498 | |
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499 inline bool |
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500 ParallelCompactData::RegionData::blocks_filled() const |
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501 { |
23457 | 502 bool result = _blocks_filled; |
503 OrderAccess::acquire(); | |
504 return result; | |
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505 } |
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506 |
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507 #ifdef ASSERT |
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508 inline size_t |
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509 ParallelCompactData::RegionData::blocks_filled_count() const |
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510 { |
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511 return _blocks_filled_count; |
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512 } |
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513 #endif // #ifdef ASSERT |
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514 |
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515 inline void |
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516 ParallelCompactData::RegionData::set_blocks_filled() |
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517 { |
23457 | 518 OrderAccess::release(); |
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519 _blocks_filled = true; |
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520 // Debug builds count the number of times the table was filled. |
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521 DEBUG_ONLY(Atomic::inc_ptr(&_blocks_filled_count)); |
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522 } |
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523 |
0 | 524 inline void |
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525 ParallelCompactData::RegionData::set_destination_count(uint count) |
0 | 526 { |
527 assert(count <= (dc_completed >> dc_shift), "count too large"); | |
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528 const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
0 | 529 _dc_and_los = (count << dc_shift) | live_sz; |
530 } | |
531 | |
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532 inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
0 | 533 { |
534 assert(words <= los_mask, "would overflow"); | |
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535 _dc_and_los = destination_count_raw() | (region_sz_t)words; |
0 | 536 } |
537 | |
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538 inline void ParallelCompactData::RegionData::decrement_destination_count() |
0 | 539 { |
540 assert(_dc_and_los < dc_claimed, "already claimed"); | |
541 assert(_dc_and_los >= dc_one, "count would go negative"); | |
542 Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); | |
543 } | |
544 | |
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545 inline HeapWord* ParallelCompactData::RegionData::data_location() const |
0 | 546 { |
547 DEBUG_ONLY(return _data_location;) | |
548 NOT_DEBUG(return NULL;) | |
549 } | |
550 | |
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551 inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
0 | 552 { |
553 DEBUG_ONLY(return _highest_ref;) | |
554 NOT_DEBUG(return NULL;) | |
555 } | |
556 | |
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557 inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
0 | 558 { |
559 DEBUG_ONLY(_data_location = addr;) | |
560 } | |
561 | |
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562 inline void ParallelCompactData::RegionData::set_completed() |
0 | 563 { |
564 assert(claimed(), "must be claimed first"); | |
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565 _dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
0 | 566 } |
567 | |
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568 // MT-unsafe claiming of a region. Should only be used during single threaded |
0 | 569 // execution. |
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570 inline bool ParallelCompactData::RegionData::claim_unsafe() |
0 | 571 { |
572 if (available()) { | |
573 _dc_and_los |= dc_claimed; | |
574 return true; | |
575 } | |
576 return false; | |
577 } | |
578 | |
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579 inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
0 | 580 { |
581 assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); | |
582 Atomic::add((int) words, (volatile int*) &_dc_and_los); | |
583 } | |
584 | |
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585 inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
0 | 586 { |
587 #ifdef ASSERT | |
588 HeapWord* tmp = _highest_ref; | |
589 while (addr > tmp) { | |
590 tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); | |
591 } | |
592 #endif // #ifdef ASSERT | |
593 } | |
594 | |
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595 inline bool ParallelCompactData::RegionData::claim() |
0 | 596 { |
597 const int los = (int) live_obj_size(); | |
598 const int old = Atomic::cmpxchg(dc_claimed | los, | |
599 (volatile int*) &_dc_and_los, los); | |
600 return old == los; | |
601 } | |
602 | |
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603 inline ParallelCompactData::RegionData* |
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604 ParallelCompactData::region(size_t region_idx) const |
0 | 605 { |
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606 assert(region_idx <= region_count(), "bad arg"); |
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607 return _region_data + region_idx; |
0 | 608 } |
609 | |
610 inline size_t | |
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611 ParallelCompactData::region(const RegionData* const region_ptr) const |
0 | 612 { |
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613 assert(region_ptr >= _region_data, "bad arg"); |
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614 assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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615 return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
0 | 616 } |
617 | |
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618 inline ParallelCompactData::BlockData* |
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619 ParallelCompactData::block(size_t n) const { |
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620 assert(n < block_count(), "bad arg"); |
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621 return _block_data + n; |
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622 } |
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623 |
0 | 624 inline size_t |
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625 ParallelCompactData::region_offset(const HeapWord* addr) const |
0 | 626 { |
627 assert(addr >= _region_start, "bad addr"); | |
628 assert(addr <= _region_end, "bad addr"); | |
375
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629 return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
0 | 630 } |
631 | |
632 inline size_t | |
375
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633 ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
0 | 634 { |
635 assert(addr >= _region_start, "bad addr"); | |
636 assert(addr <= _region_end, "bad addr"); | |
375
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637 return pointer_delta(addr, _region_start) >> Log2RegionSize; |
0 | 638 } |
639 | |
375
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640 inline ParallelCompactData::RegionData* |
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641 ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
0 | 642 { |
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643 return region(addr_to_region_idx(addr)); |
0 | 644 } |
645 | |
646 inline HeapWord* | |
375
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647 ParallelCompactData::region_to_addr(size_t region) const |
0 | 648 { |
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649 assert(region <= _region_count, "region out of range"); |
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650 return _region_start + (region << Log2RegionSize); |
0 | 651 } |
652 | |
653 inline HeapWord* | |
375
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654 ParallelCompactData::region_to_addr(const RegionData* region) const |
0 | 655 { |
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656 return region_to_addr(pointer_delta(region, _region_data, |
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657 sizeof(RegionData))); |
0 | 658 } |
659 | |
660 inline HeapWord* | |
375
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661 ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
0 | 662 { |
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663 assert(region <= _region_count, "region out of range"); |
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664 assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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665 return region_to_addr(region) + offset; |
0 | 666 } |
667 | |
668 inline HeapWord* | |
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669 ParallelCompactData::region_align_down(HeapWord* addr) const |
0 | 670 { |
671 assert(addr >= _region_start, "bad addr"); | |
375
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672 assert(addr < _region_end + RegionSize, "bad addr"); |
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673 return (HeapWord*)(size_t(addr) & RegionAddrMask); |
0 | 674 } |
675 | |
676 inline HeapWord* | |
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677 ParallelCompactData::region_align_up(HeapWord* addr) const |
0 | 678 { |
679 assert(addr >= _region_start, "bad addr"); | |
680 assert(addr <= _region_end, "bad addr"); | |
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681 return region_align_down(addr + RegionSizeOffsetMask); |
0 | 682 } |
683 | |
684 inline bool | |
375
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685 ParallelCompactData::is_region_aligned(HeapWord* addr) const |
0 | 686 { |
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687 return region_offset(addr) == 0; |
0 | 688 } |
689 | |
10369
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690 inline size_t |
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691 ParallelCompactData::block_offset(const HeapWord* addr) const |
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692 { |
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693 assert(addr >= _region_start, "bad addr"); |
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694 assert(addr <= _region_end, "bad addr"); |
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695 return (size_t(addr) & BlockAddrOffsetMask) >> LogHeapWordSize; |
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696 } |
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697 |
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698 inline size_t |
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699 ParallelCompactData::addr_to_block_idx(const HeapWord* addr) const |
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700 { |
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701 assert(addr >= _region_start, "bad addr"); |
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702 assert(addr <= _region_end, "bad addr"); |
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703 return pointer_delta(addr, _region_start) >> Log2BlockSize; |
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704 } |
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705 |
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706 inline ParallelCompactData::BlockData* |
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707 ParallelCompactData::addr_to_block_ptr(const HeapWord* addr) const |
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708 { |
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709 return block(addr_to_block_idx(addr)); |
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710 } |
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711 |
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712 inline HeapWord* |
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713 ParallelCompactData::block_to_addr(size_t block) const |
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714 { |
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715 assert(block < _block_count, "block out of range"); |
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716 return _region_start + (block << Log2BlockSize); |
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717 } |
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718 |
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719 inline size_t |
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720 ParallelCompactData::region_to_block_idx(size_t region) const |
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721 { |
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722 return region << Log2BlocksPerRegion; |
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723 } |
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724 |
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725 inline HeapWord* |
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726 ParallelCompactData::block_align_down(HeapWord* addr) const |
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727 { |
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728 assert(addr >= _region_start, "bad addr"); |
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729 assert(addr < _region_end + RegionSize, "bad addr"); |
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730 return (HeapWord*)(size_t(addr) & BlockAddrMask); |
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731 } |
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732 |
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733 inline HeapWord* |
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734 ParallelCompactData::block_align_up(HeapWord* addr) const |
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735 { |
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736 assert(addr >= _region_start, "bad addr"); |
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737 assert(addr <= _region_end, "bad addr"); |
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738 return block_align_down(addr + BlockSizeOffsetMask); |
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739 } |
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740 |
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741 inline bool |
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742 ParallelCompactData::is_block_aligned(HeapWord* addr) const |
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743 { |
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744 return block_offset(addr) == 0; |
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745 } |
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746 |
0 | 747 // Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the |
748 // do_addr() method. | |
749 // | |
750 // The closure is initialized with the number of heap words to process | |
751 // (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() | |
752 // methods in subclasses should update the total as words are processed. Since | |
753 // only one subclass actually uses this mechanism to terminate iteration, the | |
754 // default initial value is > 0. The implementation is here and not in the | |
755 // single subclass that uses it to avoid making is_full() virtual, and thus | |
756 // adding a virtual call per live object. | |
757 | |
758 class ParMarkBitMapClosure: public StackObj { | |
759 public: | |
760 typedef ParMarkBitMap::idx_t idx_t; | |
761 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
762 | |
763 public: | |
764 inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, | |
765 size_t words = max_uintx); | |
766 | |
767 inline ParCompactionManager* compaction_manager() const; | |
768 inline ParMarkBitMap* bitmap() const; | |
769 inline size_t words_remaining() const; | |
770 inline bool is_full() const; | |
771 inline HeapWord* source() const; | |
772 | |
773 inline void set_source(HeapWord* addr); | |
774 | |
775 virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; | |
776 | |
777 protected: | |
778 inline void decrement_words_remaining(size_t words); | |
779 | |
780 private: | |
781 ParMarkBitMap* const _bitmap; | |
782 ParCompactionManager* const _compaction_manager; | |
783 DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. | |
784 size_t _words_remaining; // Words left to copy. | |
785 | |
786 protected: | |
787 HeapWord* _source; // Next addr that would be read. | |
788 }; | |
789 | |
790 inline | |
791 ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, | |
792 ParCompactionManager* cm, | |
793 size_t words): | |
794 _bitmap(bitmap), _compaction_manager(cm) | |
795 #ifdef ASSERT | |
796 , _initial_words_remaining(words) | |
797 #endif | |
798 { | |
799 _words_remaining = words; | |
800 _source = NULL; | |
801 } | |
802 | |
803 inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { | |
804 return _compaction_manager; | |
805 } | |
806 | |
807 inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { | |
808 return _bitmap; | |
809 } | |
810 | |
811 inline size_t ParMarkBitMapClosure::words_remaining() const { | |
812 return _words_remaining; | |
813 } | |
814 | |
815 inline bool ParMarkBitMapClosure::is_full() const { | |
816 return words_remaining() == 0; | |
817 } | |
818 | |
819 inline HeapWord* ParMarkBitMapClosure::source() const { | |
820 return _source; | |
821 } | |
822 | |
823 inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { | |
824 _source = addr; | |
825 } | |
826 | |
827 inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { | |
828 assert(_words_remaining >= words, "processed too many words"); | |
829 _words_remaining -= words; | |
830 } | |
831 | |
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832 // The UseParallelOldGC collector is a stop-the-world garbage collector that |
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833 // does parts of the collection using parallel threads. The collection includes |
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834 // the tenured generation and the young generation. The permanent generation is |
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835 // collected at the same time as the other two generations but the permanent |
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836 // generation is collect by a single GC thread. The permanent generation is |
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837 // collected serially because of the requirement that during the processing of a |
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838 // klass AAA, any objects reference by AAA must already have been processed. |
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839 // This requirement is enforced by a left (lower address) to right (higher |
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840 // address) sliding compaction. |
263
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841 // |
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842 // There are four phases of the collection. |
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843 // |
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844 // - marking phase |
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845 // - summary phase |
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846 // - compacting phase |
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847 // - clean up phase |
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848 // |
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849 // Roughly speaking these phases correspond, respectively, to |
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850 // - mark all the live objects |
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851 // - calculate the destination of each object at the end of the collection |
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852 // - move the objects to their destination |
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853 // - update some references and reinitialize some variables |
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854 // |
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855 // These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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856 // marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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857 // complete marking of the heap. The summary phase is implemented in |
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858 // PSParallelCompact::summary_phase(). The move and update phase is implemented |
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859 // in PSParallelCompact::compact(). |
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860 // |
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861 // A space that is being collected is divided into regions and with each region |
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862 // is associated an object of type ParallelCompactData. Each region is of a |
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863 // fixed size and typically will contain more than 1 object and may have parts |
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864 // of objects at the front and back of the region. |
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865 // |
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866 // region -----+---------------------+---------- |
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867 // objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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868 // |
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869 // The marking phase does a complete marking of all live objects in the heap. |
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870 // The marking also compiles the size of the data for all live objects covered |
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871 // by the region. This size includes the part of any live object spanning onto |
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872 // the region (part of AAA if it is live) from the front, all live objects |
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873 // contained in the region (BBB and/or CCC if they are live), and the part of |
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874 // any live objects covered by the region that extends off the region (part of |
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875 // DDD if it is live). The marking phase uses multiple GC threads and marking |
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876 // is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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877 // done atomically as is the accumulation of the size of the live objects |
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878 // covered by a region. |
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879 // |
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880 // The summary phase calculates the total live data to the left of each region |
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881 // XXX. Based on that total and the bottom of the space, it can calculate the |
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882 // starting location of the live data in XXX. The summary phase calculates for |
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883 // each region XXX quantites such as |
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884 // |
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885 // - the amount of live data at the beginning of a region from an object |
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886 // entering the region. |
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887 // - the location of the first live data on the region |
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888 // - a count of the number of regions receiving live data from XXX. |
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889 // |
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890 // See ParallelCompactData for precise details. The summary phase also |
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891 // calculates the dense prefix for the compaction. The dense prefix is a |
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892 // portion at the beginning of the space that is not moved. The objects in the |
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893 // dense prefix do need to have their object references updated. See method |
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894 // summarize_dense_prefix(). |
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895 // |
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896 // The summary phase is done using 1 GC thread. |
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897 // |
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898 // The compaction phase moves objects to their new location and updates all |
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899 // references in the object. |
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900 // |
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901 // A current exception is that objects that cross a region boundary are moved |
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902 // but do not have their references updated. References are not updated because |
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903 // it cannot easily be determined if the klass pointer KKK for the object AAA |
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904 // has been updated. KKK likely resides in a region to the left of the region |
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905 // containing AAA. These AAA's have there references updated at the end in a |
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906 // clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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907 // An alternate strategy is being investigated for this deferral of updating. |
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908 // |
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909 // Compaction is done on a region basis. A region that is ready to be filled is |
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910 // put on a ready list and GC threads take region off the list and fill them. A |
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911 // region is ready to be filled if it empty of live objects. Such a region may |
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912 // have been initially empty (only contained dead objects) or may have had all |
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913 // its live objects copied out already. A region that compacts into itself is |
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914 // also ready for filling. The ready list is initially filled with empty |
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915 // regions and regions compacting into themselves. There is always at least 1 |
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916 // region that can be put on the ready list. The regions are atomically added |
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917 // and removed from the ready list. |
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918 |
0 | 919 class PSParallelCompact : AllStatic { |
920 public: | |
921 // Convenient access to type names. | |
922 typedef ParMarkBitMap::idx_t idx_t; | |
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923 typedef ParallelCompactData::RegionData RegionData; |
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924 typedef ParallelCompactData::BlockData BlockData; |
0 | 925 |
926 typedef enum { | |
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927 old_space_id, eden_space_id, |
0 | 928 from_space_id, to_space_id, last_space_id |
929 } SpaceId; | |
930 | |
931 public: | |
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932 // Inline closure decls |
0 | 933 // |
934 class IsAliveClosure: public BoolObjectClosure { | |
935 public: | |
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936 virtual bool do_object_b(oop p); |
0 | 937 }; |
938 | |
939 class KeepAliveClosure: public OopClosure { | |
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940 private: |
0 | 941 ParCompactionManager* _compaction_manager; |
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942 protected: |
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943 template <class T> inline void do_oop_work(T* p); |
0 | 944 public: |
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945 KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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946 virtual void do_oop(oop* p); |
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947 virtual void do_oop(narrowOop* p); |
0 | 948 }; |
949 | |
950 class FollowStackClosure: public VoidClosure { | |
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951 private: |
0 | 952 ParCompactionManager* _compaction_manager; |
953 public: | |
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954 FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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955 virtual void do_void(); |
0 | 956 }; |
957 | |
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958 class AdjustPointerClosure: public OopClosure { |
0 | 959 public: |
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960 virtual void do_oop(oop* p); |
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961 virtual void do_oop(narrowOop* p); |
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962 // do not walk from thread stacks to the code cache on this phase |
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963 virtual void do_code_blob(CodeBlob* cb) const { } |
0 | 964 }; |
965 | |
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966 class AdjustKlassClosure : public KlassClosure { |
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967 public: |
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968 void do_klass(Klass* klass); |
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969 }; |
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970 |
0 | 971 friend class KeepAliveClosure; |
972 friend class FollowStackClosure; | |
973 friend class AdjustPointerClosure; | |
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974 friend class AdjustKlassClosure; |
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975 friend class FollowKlassClosure; |
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976 friend class InstanceClassLoaderKlass; |
0 | 977 friend class RefProcTaskProxy; |
978 | |
979 private: | |
10405 | 980 static STWGCTimer _gc_timer; |
981 static ParallelOldTracer _gc_tracer; | |
0 | 982 static elapsedTimer _accumulated_time; |
983 static unsigned int _total_invocations; | |
984 static unsigned int _maximum_compaction_gc_num; | |
985 static jlong _time_of_last_gc; // ms | |
986 static CollectorCounters* _counters; | |
987 static ParMarkBitMap _mark_bitmap; | |
988 static ParallelCompactData _summary_data; | |
989 static IsAliveClosure _is_alive_closure; | |
990 static SpaceInfo _space_info[last_space_id]; | |
991 static bool _print_phases; | |
992 static AdjustPointerClosure _adjust_pointer_closure; | |
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993 static AdjustKlassClosure _adjust_klass_closure; |
0 | 994 |
995 // Reference processing (used in ...follow_contents) | |
996 static ReferenceProcessor* _ref_processor; | |
997 | |
998 // Updated location of intArrayKlassObj. | |
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999 static Klass* _updated_int_array_klass_obj; |
0 | 1000 |
1001 // Values computed at initialization and used by dead_wood_limiter(). | |
1002 static double _dwl_mean; | |
1003 static double _dwl_std_dev; | |
1004 static double _dwl_first_term; | |
1005 static double _dwl_adjustment; | |
1006 #ifdef ASSERT | |
1007 static bool _dwl_initialized; | |
1008 #endif // #ifdef ASSERT | |
1009 | |
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1010 |
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1011 public: |
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1012 static ParallelOldTracer* gc_tracer() { return &_gc_tracer; } |
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1013 |
0 | 1014 private: |
1015 | |
1016 static void initialize_space_info(); | |
1017 | |
1018 // Return true if details about individual phases should be printed. | |
1019 static inline bool print_phases(); | |
1020 | |
1021 // Clear the marking bitmap and summary data that cover the specified space. | |
1022 static void clear_data_covering_space(SpaceId id); | |
1023 | |
1024 static void pre_compact(PreGCValues* pre_gc_values); | |
1025 static void post_compact(); | |
1026 | |
1027 // Mark live objects | |
1028 static void marking_phase(ParCompactionManager* cm, | |
10405 | 1029 bool maximum_heap_compaction, |
1030 ParallelOldTracer *gc_tracer); | |
0 | 1031 |
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1032 template <class T> |
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1033 static inline void follow_root(ParCompactionManager* cm, T* p); |
0 | 1034 |
1035 // Compute the dense prefix for the designated space. This is an experimental | |
1036 // implementation currently not used in production. | |
1037 static HeapWord* compute_dense_prefix_via_density(const SpaceId id, | |
1038 bool maximum_compaction); | |
1039 | |
1040 // Methods used to compute the dense prefix. | |
1041 | |
1042 // Compute the value of the normal distribution at x = density. The mean and | |
1043 // standard deviation are values saved by initialize_dead_wood_limiter(). | |
1044 static inline double normal_distribution(double density); | |
1045 | |
1046 // Initialize the static vars used by dead_wood_limiter(). | |
1047 static void initialize_dead_wood_limiter(); | |
1048 | |
1049 // Return the percentage of space that can be treated as "dead wood" (i.e., | |
1050 // not reclaimed). | |
1051 static double dead_wood_limiter(double density, size_t min_percent); | |
1052 | |
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1053 // Find the first (left-most) region in the range [beg, end) that has at least |
0 | 1054 // dead_words of dead space to the left. The argument beg must be the first |
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1055 // region in the space that is not completely live. |
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1056 static RegionData* dead_wood_limit_region(const RegionData* beg, |
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1057 const RegionData* end, |
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1058 size_t dead_words); |
0 | 1059 |
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1060 // Return a pointer to the first region in the range [beg, end) that is not |
0 | 1061 // completely full. |
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1062 static RegionData* first_dead_space_region(const RegionData* beg, |
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1063 const RegionData* end); |
0 | 1064 |
1065 // Return a value indicating the benefit or 'yield' if the compacted region | |
1066 // were to start (or equivalently if the dense prefix were to end) at the | |
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1067 // candidate region. Higher values are better. |
0 | 1068 // |
1069 // The value is based on the amount of space reclaimed vs. the costs of (a) | |
1070 // updating references in the dense prefix plus (b) copying objects and | |
1071 // updating references in the compacted region. | |
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1072 static inline double reclaimed_ratio(const RegionData* const candidate, |
0 | 1073 HeapWord* const bottom, |
1074 HeapWord* const top, | |
1075 HeapWord* const new_top); | |
1076 | |
1077 // Compute the dense prefix for the designated space. | |
1078 static HeapWord* compute_dense_prefix(const SpaceId id, | |
1079 bool maximum_compaction); | |
1080 | |
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1081 // Return true if dead space crosses onto the specified Region; bit must be |
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1082 // the bit index corresponding to the first word of the Region. |
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1083 static inline bool dead_space_crosses_boundary(const RegionData* region, |
0 | 1084 idx_t bit); |
1085 | |
1086 // Summary phase utility routine to fill dead space (if any) at the dense | |
1087 // prefix boundary. Should only be called if the the dense prefix is | |
1088 // non-empty. | |
1089 static void fill_dense_prefix_end(SpaceId id); | |
1090 | |
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1091 // Clear the summary data source_region field for the specified addresses. |
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1092 static void clear_source_region(HeapWord* beg_addr, HeapWord* end_addr); |
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1093 |
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1094 #ifndef PRODUCT |
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1095 // Routines to provoke splitting a young gen space (ParallelOldGCSplitALot). |
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1096 |
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1097 // Fill the region [start, start + words) with live object(s). Only usable |
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1098 // for the old and permanent generations. |
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1099 static void fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1100 size_t words); |
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1101 // Include the new objects in the summary data. |
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1102 static void summarize_new_objects(SpaceId id, HeapWord* start); |
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1103 |
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1104 // Add live objects to a survivor space since it's rare that both survivors |
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1105 // are non-empty. |
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1106 static void provoke_split_fill_survivor(SpaceId id); |
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1107 |
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1108 // Add live objects and/or choose the dense prefix to provoke splitting. |
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1109 static void provoke_split(bool & maximum_compaction); |
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1110 #endif |
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1111 |
0 | 1112 static void summarize_spaces_quick(); |
1113 static void summarize_space(SpaceId id, bool maximum_compaction); | |
1114 static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); | |
1115 | |
1116 // Adjust addresses in roots. Does not adjust addresses in heap. | |
1117 static void adjust_roots(); | |
1118 | |
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1119 DEBUG_ONLY(static void write_block_fill_histogram(outputStream* const out);) |
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1120 |
0 | 1121 // Move objects to new locations. |
1122 static void compact_perm(ParCompactionManager* cm); | |
1123 static void compact(); | |
1124 | |
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1125 // Add available regions to the stack and draining tasks to the task queue. |
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1126 static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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1127 uint parallel_gc_threads); |
0 | 1128 |
1129 // Add dense prefix update tasks to the task queue. | |
1130 static void enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
1131 uint parallel_gc_threads); | |
1132 | |
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1133 // Add region stealing tasks to the task queue. |
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1134 static void enqueue_region_stealing_tasks( |
0 | 1135 GCTaskQueue* q, |
1136 ParallelTaskTerminator* terminator_ptr, | |
1137 uint parallel_gc_threads); | |
1138 | |
1139 // If objects are left in eden after a collection, try to move the boundary | |
1140 // and absorb them into the old gen. Returns true if eden was emptied. | |
1141 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
1142 PSYoungGen* young_gen, | |
1143 PSOldGen* old_gen); | |
1144 | |
1145 // Reset time since last full gc | |
1146 static void reset_millis_since_last_gc(); | |
1147 | |
1148 public: | |
1149 class MarkAndPushClosure: public OopClosure { | |
113
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1150 private: |
0 | 1151 ParCompactionManager* _compaction_manager; |
1152 public: | |
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1153 MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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1154 virtual void do_oop(oop* p); |
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1155 virtual void do_oop(narrowOop* p); |
0 | 1156 }; |
1157 | |
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1158 // The one and only place to start following the classes. |
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1159 // Should only be applied to the ClassLoaderData klasses list. |
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1160 class FollowKlassClosure : public KlassClosure { |
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1161 private: |
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1162 MarkAndPushClosure* _mark_and_push_closure; |
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1163 public: |
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1164 FollowKlassClosure(MarkAndPushClosure* mark_and_push_closure) : |
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1165 _mark_and_push_closure(mark_and_push_closure) { } |
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1166 void do_klass(Klass* klass); |
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1167 }; |
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1168 |
0 | 1169 PSParallelCompact(); |
1170 | |
1171 // Convenient accessor for Universe::heap(). | |
1172 static ParallelScavengeHeap* gc_heap() { | |
1173 return (ParallelScavengeHeap*)Universe::heap(); | |
1174 } | |
1175 | |
1176 static void invoke(bool maximum_heap_compaction); | |
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1177 static bool invoke_no_policy(bool maximum_heap_compaction); |
0 | 1178 |
1179 static void post_initialize(); | |
1180 // Perform initialization for PSParallelCompact that requires | |
1181 // allocations. This should be called during the VM initialization | |
1182 // at a pointer where it would be appropriate to return a JNI_ENOMEM | |
1183 // in the event of a failure. | |
1184 static bool initialize(); | |
1185 | |
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1186 // Closure accessors |
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1187 static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
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1188 static KlassClosure* adjust_klass_closure() { return (KlassClosure*)&_adjust_klass_closure; } |
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1189 static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
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1190 |
0 | 1191 // Public accessors |
1192 static elapsedTimer* accumulated_time() { return &_accumulated_time; } | |
1193 static unsigned int total_invocations() { return _total_invocations; } | |
1194 static CollectorCounters* counters() { return _counters; } | |
1195 | |
1196 // Used to add tasks | |
1197 static GCTaskManager* const gc_task_manager(); | |
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1198 static Klass* updated_int_array_klass_obj() { |
0 | 1199 return _updated_int_array_klass_obj; |
1200 } | |
1201 | |
1202 // Marking support | |
1203 static inline bool mark_obj(oop obj); | |
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1204 static inline bool is_marked(oop obj); |
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1205 // Check mark and maybe push on marking stack |
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1206 template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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1207 T* p); |
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1208 template <class T> static inline void adjust_pointer(T* p); |
0 | 1209 |
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1210 static inline void follow_klass(ParCompactionManager* cm, Klass* klass); |
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1211 |
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1212 static void follow_class_loader(ParCompactionManager* cm, |
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1213 ClassLoaderData* klass); |
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1214 |
0 | 1215 // Compaction support. |
1216 // Return true if p is in the range [beg_addr, end_addr). | |
1217 static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1218 static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); | |
1219 | |
1220 // Convenience wrappers for per-space data kept in _space_info. | |
1221 static inline MutableSpace* space(SpaceId space_id); | |
1222 static inline HeapWord* new_top(SpaceId space_id); | |
1223 static inline HeapWord* dense_prefix(SpaceId space_id); | |
1224 static inline ObjectStartArray* start_array(SpaceId space_id); | |
1225 | |
1226 // Move and update the live objects in the specified space. | |
1227 static void move_and_update(ParCompactionManager* cm, SpaceId space_id); | |
1228 | |
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1229 // Process the end of the given region range in the dense prefix. |
0 | 1230 // This includes saving any object not updated. |
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1231 static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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1232 size_t region_start_index, |
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1233 size_t region_end_index, |
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1234 idx_t exiting_object_offset, |
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1235 idx_t region_offset_start, |
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1236 idx_t region_offset_end); |
0 | 1237 |
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1238 // Update a region in the dense prefix. For each live object |
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1239 // in the region, update it's interior references. For each |
0 | 1240 // dead object, fill it with deadwood. Dead space at the end |
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1241 // of a region range will be filled to the start of the next |
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1242 // live object regardless of the region_index_end. None of the |
0 | 1243 // objects in the dense prefix move and dead space is dead |
1244 // (holds only dead objects that don't need any processing), so | |
1245 // dead space can be filled in any order. | |
1246 static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
1247 SpaceId space_id, | |
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1248 size_t region_index_start, |
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1249 size_t region_index_end); |
0 | 1250 |
1251 // Return the address of the count + 1st live word in the range [beg, end). | |
1252 static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); | |
1253 | |
1254 // Return the address of the word to be copied to dest_addr, which must be | |
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1255 // aligned to a region boundary. |
0 | 1256 static HeapWord* first_src_addr(HeapWord* const dest_addr, |
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1257 SpaceId src_space_id, |
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1258 size_t src_region_idx); |
0 | 1259 |
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1260 // Determine the next source region, set closure.source() to the start of the |
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1261 // new region return the region index. Parameter end_addr is the address one |
0 | 1262 // beyond the end of source range just processed. If necessary, switch to a |
1263 // new source space and set src_space_id (in-out parameter) and src_space_top | |
1264 // (out parameter) accordingly. | |
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1265 static size_t next_src_region(MoveAndUpdateClosure& closure, |
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1266 SpaceId& src_space_id, |
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1267 HeapWord*& src_space_top, |
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1268 HeapWord* end_addr); |
0 | 1269 |
375
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1270 // Decrement the destination count for each non-empty source region in the |
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1271 // range [beg_region, region(region_align_up(end_addr))). If the destination |
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1272 // count for a region goes to 0 and it needs to be filled, enqueue it. |
0 | 1273 static void decrement_destination_counts(ParCompactionManager* cm, |
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1274 SpaceId src_space_id, |
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1275 size_t beg_region, |
0 | 1276 HeapWord* end_addr); |
1277 | |
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1278 // Fill a region, copying objects from one or more source regions. |
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1279 static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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1280 static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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1281 fill_region(cm, region); |
0 | 1282 } |
1283 | |
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1284 // Fill in the block table for the specified region. |
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1285 static void fill_blocks(size_t region_idx); |
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1286 |
0 | 1287 // Update the deferred objects in the space. |
1288 static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); | |
1289 | |
1290 static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } | |
1291 static ParallelCompactData& summary_data() { return _summary_data; } | |
1292 | |
1293 // Reference Processing | |
1294 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
1295 | |
10405 | 1296 static STWGCTimer* gc_timer() { return &_gc_timer; } |
1297 | |
0 | 1298 // Return the SpaceId for the given address. |
1299 static SpaceId space_id(HeapWord* addr); | |
1300 | |
1301 // Time since last full gc (in milliseconds). | |
1302 static jlong millis_since_last_gc(); | |
1303 | |
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1304 static void print_on_error(outputStream* st); |
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1305 |
0 | 1306 #ifndef PRODUCT |
1307 // Debugging support. | |
1308 static const char* space_names[last_space_id]; | |
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1309 static void print_region_ranges(); |
0 | 1310 static void print_dense_prefix_stats(const char* const algorithm, |
1311 const SpaceId id, | |
1312 const bool maximum_compaction, | |
1313 HeapWord* const addr); | |
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1314 static void summary_phase_msg(SpaceId dst_space_id, |
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1315 HeapWord* dst_beg, HeapWord* dst_end, |
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1316 SpaceId src_space_id, |
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1317 HeapWord* src_beg, HeapWord* src_end); |
0 | 1318 #endif // #ifndef PRODUCT |
1319 | |
1320 #ifdef ASSERT | |
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1321 // Sanity check the new location of a word in the heap. |
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1322 static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
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1323 // Verify that all the regions have been emptied. |
0 | 1324 static void verify_complete(SpaceId space_id); |
1325 #endif // #ifdef ASSERT | |
1326 }; | |
1327 | |
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1328 inline bool PSParallelCompact::mark_obj(oop obj) { |
0 | 1329 const int obj_size = obj->size(); |
1330 if (mark_bitmap()->mark_obj(obj, obj_size)) { | |
1331 _summary_data.add_obj(obj, obj_size); | |
1332 return true; | |
1333 } else { | |
1334 return false; | |
1335 } | |
1336 } | |
1337 | |
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1338 inline bool PSParallelCompact::is_marked(oop obj) { |
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1339 return mark_bitmap()->is_marked(obj); |
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1340 } |
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1341 |
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1342 template <class T> |
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1343 inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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1344 assert(!Universe::heap()->is_in_reserved(p), |
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1345 "roots shouldn't be things within the heap"); |
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1346 |
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1347 T heap_oop = oopDesc::load_heap_oop(p); |
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1348 if (!oopDesc::is_null(heap_oop)) { |
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1349 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1350 if (mark_bitmap()->is_unmarked(obj)) { |
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1351 if (mark_obj(obj)) { |
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1352 obj->follow_contents(cm); |
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1353 } |
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1354 } |
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1355 } |
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1356 cm->follow_marking_stacks(); |
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1357 } |
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1358 |
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1359 template <class T> |
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1360 inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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1361 T heap_oop = oopDesc::load_heap_oop(p); |
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1362 if (!oopDesc::is_null(heap_oop)) { |
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1363 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
1638 | 1364 if (mark_bitmap()->is_unmarked(obj) && mark_obj(obj)) { |
1365 cm->push(obj); | |
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1366 } |
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1367 } |
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1368 } |
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1369 |
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1370 template <class T> |
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1371 inline void PSParallelCompact::adjust_pointer(T* p) { |
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1372 T heap_oop = oopDesc::load_heap_oop(p); |
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1373 if (!oopDesc::is_null(heap_oop)) { |
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1374 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1375 oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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1376 assert(new_obj != NULL, // is forwarding ptr? |
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1377 "should be forwarded"); |
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1378 // Just always do the update unconditionally? |
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1379 if (new_obj != NULL) { |
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1380 assert(Universe::heap()->is_in_reserved(new_obj), |
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1381 "should be in object space"); |
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1382 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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1383 } |
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1384 } |
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1385 } |
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1386 |
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1387 inline void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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1388 oop holder = klass->klass_holder(); |
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1389 PSParallelCompact::mark_and_push(cm, &holder); |
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1390 } |
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1391 |
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1392 template <class T> |
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1393 inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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1394 mark_and_push(_compaction_manager, p); |
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1395 } |
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1396 |
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1397 inline bool PSParallelCompact::print_phases() { |
0 | 1398 return _print_phases; |
1399 } | |
1400 | |
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1401 inline double PSParallelCompact::normal_distribution(double density) { |
0 | 1402 assert(_dwl_initialized, "uninitialized"); |
1403 const double squared_term = (density - _dwl_mean) / _dwl_std_dev; | |
1404 return _dwl_first_term * exp(-0.5 * squared_term * squared_term); | |
1405 } | |
1406 | |
1407 inline bool | |
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1408 PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
0 | 1409 idx_t bit) |
1410 { | |
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1411 assert(bit > 0, "cannot call this for the first bit/region"); |
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1412 assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
0 | 1413 "sanity check"); |
1414 | |
1415 // Dead space crosses the boundary if (1) a partial object does not extend | |
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1416 // onto the region, (2) an object does not start at the beginning of the |
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1417 // region, and (3) an object does not end at the end of the prior region. |
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1418 return region->partial_obj_size() == 0 && |
0 | 1419 !_mark_bitmap.is_obj_beg(bit) && |
1420 !_mark_bitmap.is_obj_end(bit - 1); | |
1421 } | |
1422 | |
1423 inline bool | |
1424 PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1425 return p >= beg_addr && p < end_addr; | |
1426 } | |
1427 | |
1428 inline bool | |
1429 PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { | |
1430 return is_in((HeapWord*)p, beg_addr, end_addr); | |
1431 } | |
1432 | |
1433 inline MutableSpace* PSParallelCompact::space(SpaceId id) { | |
1434 assert(id < last_space_id, "id out of range"); | |
1435 return _space_info[id].space(); | |
1436 } | |
1437 | |
1438 inline HeapWord* PSParallelCompact::new_top(SpaceId id) { | |
1439 assert(id < last_space_id, "id out of range"); | |
1440 return _space_info[id].new_top(); | |
1441 } | |
1442 | |
1443 inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { | |
1444 assert(id < last_space_id, "id out of range"); | |
1445 return _space_info[id].dense_prefix(); | |
1446 } | |
1447 | |
1448 inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { | |
1449 assert(id < last_space_id, "id out of range"); | |
1450 return _space_info[id].start_array(); | |
1451 } | |
1452 | |
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1453 #ifdef ASSERT |
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1454 inline void |
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1455 PSParallelCompact::check_new_location(HeapWord* old_addr, HeapWord* new_addr) |
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1456 { |
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1457 assert(old_addr >= new_addr || space_id(old_addr) != space_id(new_addr), |
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1458 "must move left or to a different space"); |
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1459 assert(is_object_aligned((intptr_t)old_addr) && is_object_aligned((intptr_t)new_addr), |
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1460 "checking alignment"); |
495
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1461 } |
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1462 #endif // ASSERT |
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1463 |
0 | 1464 class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
1465 public: | |
1466 inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, | |
1467 ObjectStartArray* start_array, | |
1468 HeapWord* destination, size_t words); | |
1469 | |
1470 // Accessors. | |
1471 HeapWord* destination() const { return _destination; } | |
1472 | |
1473 // If the object will fit (size <= words_remaining()), copy it to the current | |
1474 // destination, update the interior oops and the start array and return either | |
1475 // full (if the closure is full) or incomplete. If the object will not fit, | |
1476 // return would_overflow. | |
1477 virtual IterationStatus do_addr(HeapWord* addr, size_t size); | |
1478 | |
1479 // Copy enough words to fill this closure, starting at source(). Interior | |
1480 // oops and the start array are not updated. Return full. | |
1481 IterationStatus copy_until_full(); | |
1482 | |
1483 // Copy enough words to fill this closure or to the end of an object, | |
1484 // whichever is smaller, starting at source(). Interior oops and the start | |
1485 // array are not updated. | |
1486 void copy_partial_obj(); | |
1487 | |
1488 protected: | |
1489 // Update variables to indicate that word_count words were processed. | |
1490 inline void update_state(size_t word_count); | |
1491 | |
1492 protected: | |
1493 ObjectStartArray* const _start_array; | |
1494 HeapWord* _destination; // Next addr to be written. | |
1495 }; | |
1496 | |
1497 inline | |
1498 MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, | |
1499 ParCompactionManager* cm, | |
1500 ObjectStartArray* start_array, | |
1501 HeapWord* destination, | |
1502 size_t words) : | |
1503 ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) | |
1504 { | |
1505 _destination = destination; | |
1506 } | |
1507 | |
1508 inline void MoveAndUpdateClosure::update_state(size_t words) | |
1509 { | |
1510 decrement_words_remaining(words); | |
1511 _source += words; | |
1512 _destination += words; | |
1513 } | |
1514 | |
1515 class UpdateOnlyClosure: public ParMarkBitMapClosure { | |
1516 private: | |
1517 const PSParallelCompact::SpaceId _space_id; | |
1518 ObjectStartArray* const _start_array; | |
1519 | |
1520 public: | |
1521 UpdateOnlyClosure(ParMarkBitMap* mbm, | |
1522 ParCompactionManager* cm, | |
1523 PSParallelCompact::SpaceId space_id); | |
1524 | |
1525 // Update the object. | |
1526 virtual IterationStatus do_addr(HeapWord* addr, size_t words); | |
1527 | |
1528 inline void do_addr(HeapWord* addr); | |
1529 }; | |
1530 | |
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1531 inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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1532 { |
0 | 1533 _start_array->allocate_block(addr); |
1534 oop(addr)->update_contents(compaction_manager()); | |
1535 } | |
1536 | |
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1537 class FillClosure: public ParMarkBitMapClosure |
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1538 { |
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1539 public: |
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1540 FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
0 | 1541 ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
481
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1542 _start_array(PSParallelCompact::start_array(space_id)) |
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1543 { |
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1544 assert(space_id == PSParallelCompact::old_space_id, |
0 | 1545 "cannot use FillClosure in the young gen"); |
1546 } | |
1547 | |
1548 virtual IterationStatus do_addr(HeapWord* addr, size_t size) { | |
481
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1549 CollectedHeap::fill_with_objects(addr, size); |
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1550 HeapWord* const end = addr + size; |
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1551 do { |
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1552 _start_array->allocate_block(addr); |
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1553 addr += oop(addr)->size(); |
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1554 } while (addr < end); |
0 | 1555 return ParMarkBitMap::incomplete; |
1556 } | |
1557 | |
1558 private: | |
481
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1559 ObjectStartArray* const _start_array; |
0 | 1560 }; |
1972 | 1561 |
1562 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPARALLELCOMPACT_HPP |