Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 8090:2af22eb04623
Merge
author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | b735136e0d82 |
children | 7b835924c31c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, 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 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
32 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
33 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
34 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" | |
35 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
36 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
37 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
38 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
39 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
40 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
41 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
42 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
43 #include "gc_interface/gcCause.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/referenceProcessor.hpp" | |
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47 #include "oops/methodData.hpp" |
1972 | 48 #include "oops/oop.inline.hpp" |
49 #include "oops/oop.pcgc.inline.hpp" | |
50 #include "runtime/fprofiler.hpp" | |
51 #include "runtime/safepoint.hpp" | |
52 #include "runtime/vmThread.hpp" | |
53 #include "services/management.hpp" | |
54 #include "services/memoryService.hpp" | |
6197 | 55 #include "services/memTracker.hpp" |
1972 | 56 #include "utilities/events.hpp" |
57 #include "utilities/stack.inline.hpp" | |
0 | 58 |
59 #include <math.h> | |
60 | |
61 // All sizes are in HeapWords. | |
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62 const size_t ParallelCompactData::Log2RegionSize = 9; // 512 words |
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63 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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64 const size_t ParallelCompactData::RegionSizeBytes = |
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65 RegionSize << LogHeapWordSize; |
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66 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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67 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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68 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
0 | 69 |
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70 const ParallelCompactData::RegionData::region_sz_t |
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71 ParallelCompactData::RegionData::dc_shift = 27; |
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72 |
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73 const ParallelCompactData::RegionData::region_sz_t |
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74 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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75 |
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76 const ParallelCompactData::RegionData::region_sz_t |
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77 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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78 |
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79 const ParallelCompactData::RegionData::region_sz_t |
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80 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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81 |
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82 const ParallelCompactData::RegionData::region_sz_t |
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83 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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84 |
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85 const ParallelCompactData::RegionData::region_sz_t |
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86 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 87 |
88 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
89 bool PSParallelCompact::_print_phases = false; | |
90 | |
91 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
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92 Klass* PSParallelCompact::_updated_int_array_klass_obj = NULL; |
0 | 93 |
94 double PSParallelCompact::_dwl_mean; | |
95 double PSParallelCompact::_dwl_std_dev; | |
96 double PSParallelCompact::_dwl_first_term; | |
97 double PSParallelCompact::_dwl_adjustment; | |
98 #ifdef ASSERT | |
99 bool PSParallelCompact::_dwl_initialized = false; | |
100 #endif // #ifdef ASSERT | |
101 | |
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102 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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103 HeapWord* destination) |
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104 { |
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105 assert(src_region_idx != 0, "invalid src_region_idx"); |
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106 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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107 assert(destination != NULL, "invalid destination argument"); |
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108 |
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109 _src_region_idx = src_region_idx; |
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110 _partial_obj_size = partial_obj_size; |
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111 _destination = destination; |
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112 |
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113 // These fields may not be updated below, so make sure they're clear. |
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114 assert(_dest_region_addr == NULL, "should have been cleared"); |
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115 assert(_first_src_addr == NULL, "should have been cleared"); |
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116 |
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117 // Determine the number of destination regions for the partial object. |
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118 HeapWord* const last_word = destination + partial_obj_size - 1; |
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119 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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120 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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121 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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122 |
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123 if (beg_region_addr == end_region_addr) { |
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124 // One destination region. |
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125 _destination_count = 1; |
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126 if (end_region_addr == destination) { |
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127 // The destination falls on a region boundary, thus the first word of the |
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128 // partial object will be the first word copied to the destination region. |
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129 _dest_region_addr = end_region_addr; |
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130 _first_src_addr = sd.region_to_addr(src_region_idx); |
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131 } |
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132 } else { |
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133 // Two destination regions. When copied, the partial object will cross a |
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134 // destination region boundary, so a word somewhere within the partial |
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135 // object will be the first word copied to the second destination region. |
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136 _destination_count = 2; |
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137 _dest_region_addr = end_region_addr; |
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138 const size_t ofs = pointer_delta(end_region_addr, destination); |
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139 assert(ofs < _partial_obj_size, "sanity"); |
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140 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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141 } |
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142 } |
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143 |
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144 void SplitInfo::clear() |
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145 { |
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146 _src_region_idx = 0; |
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147 _partial_obj_size = 0; |
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148 _destination = NULL; |
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149 _destination_count = 0; |
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150 _dest_region_addr = NULL; |
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151 _first_src_addr = NULL; |
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152 assert(!is_valid(), "sanity"); |
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153 } |
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154 |
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155 #ifdef ASSERT |
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156 void SplitInfo::verify_clear() |
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157 { |
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158 assert(_src_region_idx == 0, "not clear"); |
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159 assert(_partial_obj_size == 0, "not clear"); |
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160 assert(_destination == NULL, "not clear"); |
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161 assert(_destination_count == 0, "not clear"); |
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162 assert(_dest_region_addr == NULL, "not clear"); |
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163 assert(_first_src_addr == NULL, "not clear"); |
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164 } |
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165 #endif // #ifdef ASSERT |
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166 |
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167 |
0 | 168 #ifndef PRODUCT |
169 const char* PSParallelCompact::space_names[] = { | |
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170 "old ", "eden", "from", "to " |
0 | 171 }; |
172 | |
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173 void PSParallelCompact::print_region_ranges() |
0 | 174 { |
175 tty->print_cr("space bottom top end new_top"); | |
176 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
177 | |
178 for (unsigned int id = 0; id < last_space_id; ++id) { | |
179 const MutableSpace* space = _space_info[id].space(); | |
180 tty->print_cr("%u %s " | |
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181 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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182 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 183 id, space_names[id], |
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184 summary_data().addr_to_region_idx(space->bottom()), |
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185 summary_data().addr_to_region_idx(space->top()), |
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186 summary_data().addr_to_region_idx(space->end()), |
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187 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 188 } |
189 } | |
190 | |
191 void | |
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192 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 193 { |
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194 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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195 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 196 |
197 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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198 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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199 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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200 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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201 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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202 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 203 i, c->data_location(), dci, c->destination(), |
204 c->partial_obj_size(), c->live_obj_size(), | |
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205 c->data_size(), c->source_region(), c->destination_count()); |
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206 |
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207 #undef REGION_IDX_FORMAT |
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208 #undef REGION_DATA_FORMAT |
0 | 209 } |
210 | |
211 void | |
212 print_generic_summary_data(ParallelCompactData& summary_data, | |
213 HeapWord* const beg_addr, | |
214 HeapWord* const end_addr) | |
215 { | |
216 size_t total_words = 0; | |
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217 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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218 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 219 HeapWord* pdest = 0; |
220 | |
221 while (i <= last) { | |
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222 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 223 if (c->data_size() != 0 || c->destination() != pdest) { |
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224 print_generic_summary_region(i, c); |
0 | 225 total_words += c->data_size(); |
226 pdest = c->destination(); | |
227 } | |
228 ++i; | |
229 } | |
230 | |
231 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
232 } | |
233 | |
234 void | |
235 print_generic_summary_data(ParallelCompactData& summary_data, | |
236 SpaceInfo* space_info) | |
237 { | |
238 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
239 const MutableSpace* space = space_info[id].space(); | |
240 print_generic_summary_data(summary_data, space->bottom(), | |
241 MAX2(space->top(), space_info[id].new_top())); | |
242 } | |
243 } | |
244 | |
245 void | |
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246 print_initial_summary_region(size_t i, |
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247 const ParallelCompactData::RegionData* c, |
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248 bool newline = true) |
0 | 249 { |
264
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250 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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251 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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252 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 253 i, c->destination(), |
254 c->partial_obj_size(), c->live_obj_size(), | |
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255 c->data_size(), c->source_region(), c->destination_count()); |
0 | 256 if (newline) tty->cr(); |
257 } | |
258 | |
259 void | |
260 print_initial_summary_data(ParallelCompactData& summary_data, | |
261 const MutableSpace* space) { | |
262 if (space->top() == space->bottom()) { | |
263 return; | |
264 } | |
265 | |
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266 const size_t region_size = ParallelCompactData::RegionSize; |
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267 typedef ParallelCompactData::RegionData RegionData; |
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268 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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269 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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270 const RegionData* c = summary_data.region(end_region - 1); |
0 | 271 HeapWord* end_addr = c->destination() + c->data_size(); |
272 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
273 | |
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274 // Print (and count) the full regions at the beginning of the space. |
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275 size_t full_region_count = 0; |
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276 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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277 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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278 print_initial_summary_region(i, summary_data.region(i)); |
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279 ++full_region_count; |
0 | 280 ++i; |
281 } | |
282 | |
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283 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 284 |
285 double max_reclaimed_ratio = 0.0; | |
375
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286 size_t max_reclaimed_ratio_region = 0; |
0 | 287 size_t max_dead_to_right = 0; |
288 size_t max_live_to_right = 0; | |
289 | |
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290 // Print the 'reclaimed ratio' for regions while there is something live in |
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291 // the region or to the right of it. The remaining regions are empty (and |
0 | 292 // uninteresting), and computing the ratio will result in division by 0. |
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293 while (i < end_region && live_to_right > 0) { |
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294 c = summary_data.region(i); |
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295 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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296 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 297 const size_t dead_to_right = used_to_right - live_to_right; |
298 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
299 | |
300 if (reclaimed_ratio > max_reclaimed_ratio) { | |
301 max_reclaimed_ratio = reclaimed_ratio; | |
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302 max_reclaimed_ratio_region = i; |
0 | 303 max_dead_to_right = dead_to_right; |
304 max_live_to_right = live_to_right; | |
305 } | |
306 | |
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307 print_initial_summary_region(i, c, false); |
264
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308 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 309 reclaimed_ratio, dead_to_right, live_to_right); |
310 | |
311 live_to_right -= c->data_size(); | |
312 ++i; | |
313 } | |
314 | |
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315 // Any remaining regions are empty. Print one more if there is one. |
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316 if (i < end_region) { |
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317 print_initial_summary_region(i, summary_data.region(i)); |
0 | 318 } |
319 | |
264
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320 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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321 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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322 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 323 max_live_to_right, max_reclaimed_ratio); |
324 } | |
325 | |
326 void | |
327 print_initial_summary_data(ParallelCompactData& summary_data, | |
328 SpaceInfo* space_info) { | |
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329 unsigned int id = PSParallelCompact::old_space_id; |
0 | 330 const MutableSpace* space; |
331 do { | |
332 space = space_info[id].space(); | |
333 print_initial_summary_data(summary_data, space); | |
334 } while (++id < PSParallelCompact::eden_space_id); | |
335 | |
336 do { | |
337 space = space_info[id].space(); | |
338 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
339 } while (++id < PSParallelCompact::last_space_id); | |
340 } | |
341 #endif // #ifndef PRODUCT | |
342 | |
343 #ifdef ASSERT | |
344 size_t add_obj_count; | |
345 size_t add_obj_size; | |
346 size_t mark_bitmap_count; | |
347 size_t mark_bitmap_size; | |
348 #endif // #ifdef ASSERT | |
349 | |
350 ParallelCompactData::ParallelCompactData() | |
351 { | |
352 _region_start = 0; | |
353 | |
375
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354 _region_vspace = 0; |
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355 _region_data = 0; |
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356 _region_count = 0; |
0 | 357 } |
358 | |
359 bool ParallelCompactData::initialize(MemRegion covered_region) | |
360 { | |
361 _region_start = covered_region.start(); | |
362 const size_t region_size = covered_region.word_size(); | |
363 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
364 | |
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365 assert(region_align_down(_region_start) == _region_start, |
0 | 366 "region start not aligned"); |
375
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367 assert((region_size & RegionSizeOffsetMask) == 0, |
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368 "region size not a multiple of RegionSize"); |
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369 |
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370 bool result = initialize_region_data(region_size); |
0 | 371 |
372 return result; | |
373 } | |
374 | |
375 PSVirtualSpace* | |
376 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
377 { | |
378 const size_t raw_bytes = count * element_size; | |
379 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
380 const size_t granularity = os::vm_allocation_granularity(); | |
381 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
382 | |
383 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
384 MAX2(page_sz, granularity); | |
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385 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 386 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
387 rs.size()); | |
6197 | 388 |
389 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
390 | |
0 | 391 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
392 if (vspace != 0) { | |
393 if (vspace->expand_by(bytes)) { | |
394 return vspace; | |
395 } | |
396 delete vspace; | |
237
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397 // Release memory reserved in the space. |
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398 rs.release(); |
0 | 399 } |
400 | |
401 return 0; | |
402 } | |
403 | |
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404 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 405 { |
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406 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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407 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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408 if (_region_vspace != 0) { |
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409 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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410 _region_count = count; |
0 | 411 return true; |
412 } | |
413 return false; | |
414 } | |
415 | |
416 void ParallelCompactData::clear() | |
417 { | |
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418 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 419 } |
420 | |
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421 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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422 assert(beg_region <= _region_count, "beg_region out of range"); |
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423 assert(end_region <= _region_count, "end_region out of range"); |
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424 |
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425 const size_t region_cnt = end_region - beg_region; |
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426 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 427 } |
428 | |
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429 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 430 { |
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431 const RegionData* cur_cp = region(region_idx); |
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432 const RegionData* const end_cp = region(region_count() - 1); |
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433 |
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434 HeapWord* result = region_to_addr(region_idx); |
0 | 435 if (cur_cp < end_cp) { |
436 do { | |
437 result += cur_cp->partial_obj_size(); | |
375
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438 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 439 } |
440 return result; | |
441 } | |
442 | |
443 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
444 { | |
445 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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446 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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447 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 448 |
449 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
450 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
451 | |
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452 if (beg_region == end_region) { |
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453 // All in one region. |
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454 _region_data[beg_region].add_live_obj(len); |
0 | 455 return; |
456 } | |
457 | |
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458 // First region. |
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459 const size_t beg_ofs = region_offset(addr); |
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460 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 461 |
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462 Klass* klass = ((oop)addr)->klass(); |
375
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463 // Middle regions--completely spanned by this object. |
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464 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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465 _region_data[region].set_partial_obj_size(RegionSize); |
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466 _region_data[region].set_partial_obj_addr(addr); |
0 | 467 } |
468 | |
375
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469 // Last region. |
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470 const size_t end_ofs = region_offset(addr + len - 1); |
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471 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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472 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 473 } |
474 | |
475 void | |
476 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
477 { | |
375
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478 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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479 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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480 |
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481 size_t cur_region = addr_to_region_idx(beg); |
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482 const size_t end_region = addr_to_region_idx(end); |
0 | 483 HeapWord* addr = beg; |
375
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484 while (cur_region < end_region) { |
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485 _region_data[cur_region].set_destination(addr); |
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486 _region_data[cur_region].set_destination_count(0); |
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487 _region_data[cur_region].set_source_region(cur_region); |
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488 _region_data[cur_region].set_data_location(addr); |
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489 |
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490 // Update live_obj_size so the region appears completely full. |
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491 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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492 _region_data[cur_region].set_live_obj_size(live_size); |
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493 |
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494 ++cur_region; |
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495 addr += RegionSize; |
0 | 496 } |
497 } | |
498 | |
482
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499 // Find the point at which a space can be split and, if necessary, record the |
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500 // split point. |
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501 // |
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502 // If the current src region (which overflowed the destination space) doesn't |
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503 // have a partial object, the split point is at the beginning of the current src |
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504 // region (an "easy" split, no extra bookkeeping required). |
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505 // |
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506 // If the current src region has a partial object, the split point is in the |
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507 // region where that partial object starts (call it the split_region). If |
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508 // split_region has a partial object, then the split point is just after that |
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509 // partial object (a "hard" split where we have to record the split data and |
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510 // zero the partial_obj_size field). With a "hard" split, we know that the |
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511 // partial_obj ends within split_region because the partial object that caused |
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512 // the overflow starts in split_region. If split_region doesn't have a partial |
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513 // obj, then the split is at the beginning of split_region (another "easy" |
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514 // split). |
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515 HeapWord* |
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516 ParallelCompactData::summarize_split_space(size_t src_region, |
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517 SplitInfo& split_info, |
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518 HeapWord* destination, |
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519 HeapWord* target_end, |
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520 HeapWord** target_next) |
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521 { |
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522 assert(destination <= target_end, "sanity"); |
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523 assert(destination + _region_data[src_region].data_size() > target_end, |
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524 "region should not fit into target space"); |
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525 assert(is_region_aligned(target_end), "sanity"); |
482
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526 |
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527 size_t split_region = src_region; |
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528 HeapWord* split_destination = destination; |
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529 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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530 |
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531 if (destination + partial_obj_size > target_end) { |
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532 // The split point is just after the partial object (if any) in the |
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533 // src_region that contains the start of the object that overflowed the |
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534 // destination space. |
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535 // |
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536 // Find the start of the "overflow" object and set split_region to the |
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537 // region containing it. |
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538 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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539 split_region = addr_to_region_idx(overflow_obj); |
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540 |
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541 // Clear the source_region field of all destination regions whose first word |
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542 // came from data after the split point (a non-null source_region field |
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543 // implies a region must be filled). |
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544 // |
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545 // An alternative to the simple loop below: clear during post_compact(), |
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546 // which uses memcpy instead of individual stores, and is easy to |
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547 // parallelize. (The downside is that it clears the entire RegionData |
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548 // object as opposed to just one field.) |
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549 // |
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550 // post_compact() would have to clear the summary data up to the highest |
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551 // address that was written during the summary phase, which would be |
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552 // |
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553 // max(top, max(new_top, clear_top)) |
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554 // |
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555 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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556 // to target_end. |
482
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557 const RegionData* const sr = region(split_region); |
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558 const size_t beg_idx = |
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559 addr_to_region_idx(region_align_up(sr->destination() + |
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560 sr->partial_obj_size())); |
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561 const size_t end_idx = addr_to_region_idx(target_end); |
482
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562 |
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563 if (TraceParallelOldGCSummaryPhase) { |
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564 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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565 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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566 beg_idx, end_idx); |
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567 } |
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568 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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569 _region_data[idx].set_source_region(0); |
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570 } |
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571 |
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572 // Set split_destination and partial_obj_size to reflect the split region. |
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573 split_destination = sr->destination(); |
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574 partial_obj_size = sr->partial_obj_size(); |
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575 } |
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576 |
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577 // The split is recorded only if a partial object extends onto the region. |
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578 if (partial_obj_size != 0) { |
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579 _region_data[split_region].set_partial_obj_size(0); |
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580 split_info.record(split_region, partial_obj_size, split_destination); |
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581 } |
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582 |
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583 // Setup the continuation addresses. |
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584 *target_next = split_destination + partial_obj_size; |
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585 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 586 |
587 if (TraceParallelOldGCSummaryPhase) { | |
482
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588 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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589 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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590 " pos=" SIZE_FORMAT, |
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591 split_type, source_next, split_region, |
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592 partial_obj_size); |
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593 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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594 " tn=" PTR_FORMAT, |
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595 split_type, split_destination, |
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|
596 addr_to_region_idx(split_destination), |
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diff
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|
597 *target_next); |
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diff
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|
598 |
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|
599 if (partial_obj_size != 0) { |
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600 HeapWord* const po_beg = split_info.destination(); |
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601 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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602 gclog_or_tty->print_cr("%s split: " |
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603 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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604 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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605 split_type, |
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606 po_beg, addr_to_region_idx(po_beg), |
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607 po_end, addr_to_region_idx(po_end)); |
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608 } |
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609 } |
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610 |
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611 return source_next; |
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612 } |
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613 |
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614 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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615 HeapWord* source_beg, HeapWord* source_end, |
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616 HeapWord** source_next, |
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617 HeapWord* target_beg, HeapWord* target_end, |
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618 HeapWord** target_next) |
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619 { |
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620 if (TraceParallelOldGCSummaryPhase) { |
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621 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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622 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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623 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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624 source_beg, source_end, source_next_val, |
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625 target_beg, target_end, *target_next); |
0 | 626 } |
627 | |
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628 size_t cur_region = addr_to_region_idx(source_beg); |
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629 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 630 |
631 HeapWord *dest_addr = target_beg; | |
375
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632 while (cur_region < end_region) { |
482
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633 // The destination must be set even if the region has no data. |
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634 _region_data[cur_region].set_destination(dest_addr); |
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635 |
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636 size_t words = _region_data[cur_region].data_size(); |
0 | 637 if (words > 0) { |
482
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638 // If cur_region does not fit entirely into the target space, find a point |
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639 // at which the source space can be 'split' so that part is copied to the |
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640 // target space and the rest is copied elsewhere. |
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641 if (dest_addr + words > target_end) { |
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642 assert(source_next != NULL, "source_next is NULL when splitting"); |
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643 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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644 target_end, target_next); |
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645 return false; |
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646 } |
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647 |
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648 // Compute the destination_count for cur_region, and if necessary, update |
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649 // source_region for a destination region. The source_region field is |
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650 // updated if cur_region is the first (left-most) region to be copied to a |
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651 // destination region. |
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652 // |
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653 // The destination_count calculation is a bit subtle. A region that has |
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654 // data that compacts into itself does not count itself as a destination. |
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655 // This maintains the invariant that a zero count means the region is |
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656 // available and can be claimed and then filled. |
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657 uint destination_count = 0; |
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658 if (split_info.is_split(cur_region)) { |
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659 // The current region has been split: the partial object will be copied |
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660 // to one destination space and the remaining data will be copied to |
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661 // another destination space. Adjust the initial destination_count and, |
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662 // if necessary, set the source_region field if the partial object will |
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663 // cross a destination region boundary. |
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664 destination_count = split_info.destination_count(); |
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665 if (destination_count == 2) { |
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666 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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667 _region_data[dest_idx].set_source_region(cur_region); |
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668 } |
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669 } |
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670 |
0 | 671 HeapWord* const last_addr = dest_addr + words - 1; |
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672 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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673 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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674 |
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675 // Initially assume that the destination regions will be the same and |
0 | 676 // adjust the value below if necessary. Under this assumption, if |
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677 // cur_region == dest_region_2, then cur_region will be compacted |
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678 // completely into itself. |
482
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679 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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680 if (dest_region_1 != dest_region_2) { |
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681 // Destination regions differ; adjust destination_count. |
0 | 682 destination_count += 1; |
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683 // Data from cur_region will be copied to the start of dest_region_2. |
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684 _region_data[dest_region_2].set_source_region(cur_region); |
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685 } else if (region_offset(dest_addr) == 0) { |
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686 // Data from cur_region will be copied to the start of the destination |
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687 // region. |
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688 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 689 } |
690 | |
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691 _region_data[cur_region].set_destination_count(destination_count); |
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692 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 693 dest_addr += words; |
694 } | |
695 | |
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696 ++cur_region; |
0 | 697 } |
698 | |
699 *target_next = dest_addr; | |
700 return true; | |
701 } | |
702 | |
703 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
704 assert(addr != NULL, "Should detect NULL oop earlier"); | |
705 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
706 #ifdef ASSERT | |
707 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
708 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
709 } | |
710 #endif | |
711 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
712 | |
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713 // Region covering the object. |
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714 size_t region_index = addr_to_region_idx(addr); |
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715 const RegionData* const region_ptr = region(region_index); |
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716 HeapWord* const region_addr = region_align_down(addr); |
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717 |
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718 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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719 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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720 |
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721 HeapWord* result = region_ptr->destination(); |
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722 |
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723 // If all the data in the region is live, then the new location of the object |
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724 // can be calculated from the destination of the region plus the offset of the |
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725 // object in the region. |
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726 if (region_ptr->data_size() == RegionSize) { |
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727 result += pointer_delta(addr, region_addr); |
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728 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 729 return result; |
730 } | |
731 | |
732 // The new location of the object is | |
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733 // region destination + |
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734 // size of the partial object extending onto the region + |
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735 // sizes of the live objects in the Region that are to the left of addr |
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736 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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737 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 738 |
739 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
740 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
741 | |
742 result += partial_obj_size + live_to_left; | |
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743 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 744 return result; |
745 } | |
746 | |
747 #ifdef ASSERT | |
748 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
749 { | |
750 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
751 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
752 for (const size_t* p = beg; p < end; ++p) { | |
753 assert(*p == 0, "not zero"); | |
754 } | |
755 } | |
756 | |
757 void ParallelCompactData::verify_clear() | |
758 { | |
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759 verify_clear(_region_vspace); |
0 | 760 } |
761 #endif // #ifdef ASSERT | |
762 | |
763 #ifdef NOT_PRODUCT | |
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764 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 765 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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766 return sd.region(region_index); |
0 | 767 } |
768 #endif | |
769 | |
770 elapsedTimer PSParallelCompact::_accumulated_time; | |
771 unsigned int PSParallelCompact::_total_invocations = 0; | |
772 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
773 jlong PSParallelCompact::_time_of_last_gc = 0; | |
774 CollectorCounters* PSParallelCompact::_counters = NULL; | |
775 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
776 ParallelCompactData PSParallelCompact::_summary_data; | |
777 | |
778 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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779 |
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780 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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781 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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782 |
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783 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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784 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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785 |
0 | 786 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_root_pointer_closure(true); |
787 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure(false); | |
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788 PSParallelCompact::AdjustKlassClosure PSParallelCompact::_adjust_klass_closure; |
0 | 789 |
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790 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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791 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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792 |
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793 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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794 |
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795 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { |
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796 mark_and_push(_compaction_manager, p); |
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797 } |
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798 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 799 |
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800 void PSParallelCompact::FollowKlassClosure::do_klass(Klass* klass) { |
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801 klass->oops_do(_mark_and_push_closure); |
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802 } |
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803 void PSParallelCompact::AdjustKlassClosure::do_klass(Klass* klass) { |
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804 klass->oops_do(&PSParallelCompact::_adjust_root_pointer_closure); |
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805 } |
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806 |
0 | 807 void PSParallelCompact::post_initialize() { |
808 ParallelScavengeHeap* heap = gc_heap(); | |
809 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
810 | |
811 MemRegion mr = heap->reserved_region(); | |
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812 _ref_processor = |
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813 new ReferenceProcessor(mr, // span |
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814 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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815 (int) ParallelGCThreads, // mt processing degree |
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816 true, // mt discovery |
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817 (int) ParallelGCThreads, // mt discovery degree |
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818 true, // atomic_discovery |
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819 &_is_alive_closure, // non-header is alive closure |
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820 false); // write barrier for next field updates |
0 | 821 _counters = new CollectorCounters("PSParallelCompact", 1); |
822 | |
823 // Initialize static fields in ParCompactionManager. | |
824 ParCompactionManager::initialize(mark_bitmap()); | |
825 } | |
826 | |
827 bool PSParallelCompact::initialize() { | |
828 ParallelScavengeHeap* heap = gc_heap(); | |
829 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
830 MemRegion mr = heap->reserved_region(); | |
831 | |
832 // Was the old gen get allocated successfully? | |
833 if (!heap->old_gen()->is_allocated()) { | |
834 return false; | |
835 } | |
836 | |
837 initialize_space_info(); | |
838 initialize_dead_wood_limiter(); | |
839 | |
840 if (!_mark_bitmap.initialize(mr)) { | |
841 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
842 "parallel garbage collection for the requested heap size."); | |
843 return false; | |
844 } | |
845 | |
846 if (!_summary_data.initialize(mr)) { | |
847 vm_shutdown_during_initialization("Unable to allocate tables for " | |
848 "parallel garbage collection for the requested heap size."); | |
849 return false; | |
850 } | |
851 | |
852 return true; | |
853 } | |
854 | |
855 void PSParallelCompact::initialize_space_info() | |
856 { | |
857 memset(&_space_info, 0, sizeof(_space_info)); | |
858 | |
859 ParallelScavengeHeap* heap = gc_heap(); | |
860 PSYoungGen* young_gen = heap->young_gen(); | |
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861 |
0 | 862 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
863 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
864 _space_info[from_space_id].set_space(young_gen->from_space()); | |
865 _space_info[to_space_id].set_space(young_gen->to_space()); | |
866 | |
867 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
868 } | |
869 | |
870 void PSParallelCompact::initialize_dead_wood_limiter() | |
871 { | |
872 const size_t max = 100; | |
873 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
874 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
875 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
876 DEBUG_ONLY(_dwl_initialized = true;) | |
877 _dwl_adjustment = normal_distribution(1.0); | |
878 } | |
879 | |
880 // Simple class for storing info about the heap at the start of GC, to be used | |
881 // after GC for comparison/printing. | |
882 class PreGCValues { | |
883 public: | |
884 PreGCValues() { } | |
885 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
886 | |
887 void fill(ParallelScavengeHeap* heap) { | |
888 _heap_used = heap->used(); | |
889 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
890 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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891 _metadata_used = MetaspaceAux::used_in_bytes(); |
0 | 892 }; |
893 | |
894 size_t heap_used() const { return _heap_used; } | |
895 size_t young_gen_used() const { return _young_gen_used; } | |
896 size_t old_gen_used() const { return _old_gen_used; } | |
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897 size_t metadata_used() const { return _metadata_used; } |
0 | 898 |
899 private: | |
900 size_t _heap_used; | |
901 size_t _young_gen_used; | |
902 size_t _old_gen_used; | |
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903 size_t _metadata_used; |
0 | 904 }; |
905 | |
906 void | |
907 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
908 { | |
909 // At this point, top is the value before GC, new_top() is the value that will | |
910 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
911 // should be marked above top. The summary data is cleared to the larger of | |
912 // top & new_top. | |
913 MutableSpace* const space = _space_info[id].space(); | |
914 HeapWord* const bot = space->bottom(); | |
915 HeapWord* const top = space->top(); | |
916 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
917 | |
918 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
919 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
920 _mark_bitmap.clear_range(beg_bit, end_bit); | |
921 | |
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922 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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923 const size_t end_region = |
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924 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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925 _summary_data.clear_range(beg_region, end_region); |
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926 |
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927 // Clear the data used to 'split' regions. |
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928 SplitInfo& split_info = _space_info[id].split_info(); |
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929 if (split_info.is_valid()) { |
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930 split_info.clear(); |
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931 } |
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932 DEBUG_ONLY(split_info.verify_clear();) |
0 | 933 } |
934 | |
935 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
936 { | |
937 // Update the from & to space pointers in space_info, since they are swapped | |
938 // at each young gen gc. Do the update unconditionally (even though a | |
939 // promotion failure does not swap spaces) because an unknown number of minor | |
940 // collections will have swapped the spaces an unknown number of times. | |
941 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
942 ParallelScavengeHeap* heap = gc_heap(); | |
943 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
944 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
945 | |
946 pre_gc_values->fill(heap); | |
947 | |
948 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
949 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
950 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
951 | |
952 // Increment the invocation count | |
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953 heap->increment_total_collections(true); |
0 | 954 |
955 // We need to track unique mark sweep invocations as well. | |
956 _total_invocations++; | |
957 | |
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958 heap->print_heap_before_gc(); |
0 | 959 |
960 // Fill in TLABs | |
961 heap->accumulate_statistics_all_tlabs(); | |
962 heap->ensure_parsability(true); // retire TLABs | |
963 | |
964 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
965 HandleMark hm; // Discard invalid handles created during verification | |
966 gclog_or_tty->print(" VerifyBeforeGC:"); | |
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967 Universe::verify(); |
0 | 968 } |
969 | |
970 // Verify object start arrays | |
971 if (VerifyObjectStartArray && | |
972 VerifyBeforeGC) { | |
973 heap->old_gen()->verify_object_start_array(); | |
974 } | |
975 | |
976 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
977 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 978 |
979 // Have worker threads release resources the next time they run a task. | |
980 gc_task_manager()->release_all_resources(); | |
0 | 981 } |
982 | |
983 void PSParallelCompact::post_compact() | |
984 { | |
985 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
986 | |
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987 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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988 // Clear the marking bitmap, summary data and split info. |
0 | 989 clear_data_covering_space(SpaceId(id)); |
482
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990 // Update top(). Must be done after clearing the bitmap and summary data. |
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991 _space_info[id].publish_new_top(); |
0 | 992 } |
993 | |
994 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
995 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
996 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
997 | |
998 ParallelScavengeHeap* heap = gc_heap(); | |
999 bool eden_empty = eden_space->is_empty(); | |
1000 if (!eden_empty) { | |
1001 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1002 heap->young_gen(), heap->old_gen()); | |
1003 } | |
1004 | |
1005 // Update heap occupancy information which is used as input to the soft ref | |
1006 // clearing policy at the next gc. | |
1007 Universe::update_heap_info_at_gc(); | |
1008 | |
1009 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1010 to_space->is_empty(); | |
1011 | |
1012 BarrierSet* bs = heap->barrier_set(); | |
1013 if (bs->is_a(BarrierSet::ModRef)) { | |
1014 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1015 MemRegion old_mr = heap->old_gen()->reserved(); | |
1016 | |
1017 if (young_gen_empty) { | |
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1018 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1019 } else { |
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1020 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1021 } |
1022 } | |
1023 | |
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1024 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1025 ClassLoaderDataGraph::purge(); |
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1026 |
0 | 1027 Threads::gc_epilogue(); |
1028 CodeCache::gc_epilogue(); | |
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1029 JvmtiExport::gc_epilogue(); |
0 | 1030 |
1031 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1032 | |
1033 ref_processor()->enqueue_discovered_references(NULL); | |
1034 | |
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1035 if (ZapUnusedHeapArea) { |
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1036 heap->gen_mangle_unused_area(); |
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1037 } |
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1038 |
0 | 1039 // Update time of last GC |
1040 reset_millis_since_last_gc(); | |
1041 } | |
1042 | |
1043 HeapWord* | |
1044 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1045 bool maximum_compaction) | |
1046 { | |
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1047 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1048 const ParallelCompactData& sd = summary_data(); |
1049 | |
1050 const MutableSpace* const space = _space_info[id].space(); | |
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1051 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1052 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1053 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1054 |
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1055 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1056 // of the dense prefix. |
1057 size_t full_count = 0; | |
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1058 const RegionData* cp; |
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1059 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1060 ++full_count; |
1061 } | |
1062 | |
1063 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1064 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1065 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1066 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1067 _maximum_compaction_gc_num = total_invocations(); | |
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1068 return sd.region_to_addr(cp); |
0 | 1069 } |
1070 | |
1071 HeapWord* const new_top = _space_info[id].new_top(); | |
1072 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1073 const size_t space_used = space->used_in_words(); | |
1074 const size_t space_capacity = space->capacity_in_words(); | |
1075 | |
1076 const double cur_density = double(space_live) / space_capacity; | |
1077 const double deadwood_density = | |
1078 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1079 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1080 | |
1081 if (TraceParallelOldGCDensePrefix) { | |
1082 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1083 cur_density, deadwood_density, deadwood_goal); | |
1084 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1085 "space_cap=" SIZE_FORMAT, | |
1086 space_live, space_used, | |
1087 space_capacity); | |
1088 } | |
1089 | |
1090 // XXX - Use binary search? | |
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1091 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1092 const RegionData* full_cp = cp; |
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1093 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1094 while (cp < end_cp) { |
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1095 HeapWord* region_destination = cp->destination(); |
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1096 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1097 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1098 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1099 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1100 sd.region(cp), region_destination, |
0 | 1101 dense_prefix, cur_deadwood); |
1102 } | |
1103 | |
1104 if (cur_deadwood >= deadwood_goal) { | |
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1105 // Found the region that has the correct amount of deadwood to the left. |
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1106 // This typically occurs after crossing a fairly sparse set of regions, so |
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1107 // iterate backwards over those sparse regions, looking for the region |
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1108 // that has the lowest density of live objects 'to the right.' |
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1109 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1110 size_t live_to_left = space_to_left - cur_deadwood; |
1111 size_t space_to_right = space_capacity - space_to_left; | |
1112 size_t live_to_right = space_live - live_to_left; | |
1113 double density_to_right = double(live_to_right) / space_to_right; | |
1114 while (cp > full_cp) { | |
1115 --cp; | |
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1116 const size_t prev_region_live_to_right = live_to_right - |
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1117 cp->data_size(); |
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1118 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1119 double prev_region_density_to_right = |
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1120 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1121 if (density_to_right <= prev_region_density_to_right) { |
0 | 1122 return dense_prefix; |
1123 } | |
1124 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1125 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1126 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1127 prev_region_density_to_right); |
0 | 1128 } |
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1129 dense_prefix -= region_size; |
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1130 live_to_right = prev_region_live_to_right; |
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1131 space_to_right = prev_region_space_to_right; |
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1132 density_to_right = prev_region_density_to_right; |
0 | 1133 } |
1134 return dense_prefix; | |
1135 } | |
1136 | |
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1137 dense_prefix += region_size; |
0 | 1138 ++cp; |
1139 } | |
1140 | |
1141 return dense_prefix; | |
1142 } | |
1143 | |
1144 #ifndef PRODUCT | |
1145 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1146 const SpaceId id, | |
1147 const bool maximum_compaction, | |
1148 HeapWord* const addr) | |
1149 { | |
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1150 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1151 RegionData* const cp = summary_data().region(region_idx); |
0 | 1152 const MutableSpace* const space = _space_info[id].space(); |
1153 HeapWord* const new_top = _space_info[id].new_top(); | |
1154 | |
1155 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1156 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1157 const size_t space_cap = space->capacity_in_words(); | |
1158 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1159 const size_t live_to_right = new_top - cp->destination(); | |
1160 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1161 | |
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1162 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1163 "spl=" SIZE_FORMAT " " |
1164 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1165 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1166 " ratio=%10.8f", | |
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1167 algorithm, addr, region_idx, |
0 | 1168 space_live, |
1169 dead_to_left, dead_to_left_pct, | |
1170 dead_to_right, live_to_right, | |
1171 double(dead_to_right) / live_to_right); | |
1172 } | |
1173 #endif // #ifndef PRODUCT | |
1174 | |
1175 // Return a fraction indicating how much of the generation can be treated as | |
1176 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1177 // based on the density of live objects in the generation to determine a limit, | |
1178 // which is then adjusted so the return value is min_percent when the density is | |
1179 // 1. | |
1180 // | |
1181 // The following table shows some return values for a different values of the | |
1182 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1183 // min_percent is 1. | |
1184 // | |
1185 // fraction allowed as dead wood | |
1186 // ----------------------------------------------------------------- | |
1187 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1188 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1189 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1190 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1191 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1192 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1193 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1194 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1195 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1196 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1197 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1198 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1199 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1200 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1201 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1202 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1203 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1204 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1205 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1206 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1207 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1208 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1209 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1210 | |
1211 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1212 { | |
1213 assert(_dwl_initialized, "uninitialized"); | |
1214 | |
1215 // The raw limit is the value of the normal distribution at x = density. | |
1216 const double raw_limit = normal_distribution(density); | |
1217 | |
1218 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1219 // | |
1220 // First subtract the adjustment value (which is simply the precomputed value | |
1221 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1222 // Then add the minimum value, so the minimum is returned when the density is | |
1223 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1224 const double min = double(min_percent) / 100.0; | |
1225 const double limit = raw_limit - _dwl_adjustment + min; | |
1226 return MAX2(limit, 0.0); | |
1227 } | |
1228 | |
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1229 ParallelCompactData::RegionData* |
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1230 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1231 const RegionData* end) |
0 | 1232 { |
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1233 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1234 ParallelCompactData& sd = summary_data(); |
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1235 size_t left = sd.region(beg); |
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1236 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1237 |
1238 // Binary search. | |
1239 while (left < right) { | |
1240 // Equivalent to (left + right) / 2, but does not overflow. | |
1241 const size_t middle = left + (right - left) / 2; | |
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1242 RegionData* const middle_ptr = sd.region(middle); |
0 | 1243 HeapWord* const dest = middle_ptr->destination(); |
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1244 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1245 assert(dest != NULL, "sanity"); |
1246 assert(dest <= addr, "must move left"); | |
1247 | |
1248 if (middle > left && dest < addr) { | |
1249 right = middle - 1; | |
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1250 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1251 left = middle + 1; |
1252 } else { | |
1253 return middle_ptr; | |
1254 } | |
1255 } | |
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1256 return sd.region(left); |
0 | 1257 } |
1258 | |
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1259 ParallelCompactData::RegionData* |
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1260 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1261 const RegionData* end, |
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1262 size_t dead_words) |
0 | 1263 { |
1264 ParallelCompactData& sd = summary_data(); | |
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1265 size_t left = sd.region(beg); |
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1266 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1267 |
1268 // Binary search. | |
1269 while (left < right) { | |
1270 // Equivalent to (left + right) / 2, but does not overflow. | |
1271 const size_t middle = left + (right - left) / 2; | |
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1272 RegionData* const middle_ptr = sd.region(middle); |
0 | 1273 HeapWord* const dest = middle_ptr->destination(); |
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1274 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1275 assert(dest != NULL, "sanity"); |
1276 assert(dest <= addr, "must move left"); | |
1277 | |
1278 const size_t dead_to_left = pointer_delta(addr, dest); | |
1279 if (middle > left && dead_to_left > dead_words) { | |
1280 right = middle - 1; | |
1281 } else if (middle < right && dead_to_left < dead_words) { | |
1282 left = middle + 1; | |
1283 } else { | |
1284 return middle_ptr; | |
1285 } | |
1286 } | |
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1287 return sd.region(left); |
0 | 1288 } |
1289 | |
1290 // The result is valid during the summary phase, after the initial summarization | |
1291 // of each space into itself, and before final summarization. | |
1292 inline double | |
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1293 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1294 HeapWord* const bottom, |
1295 HeapWord* const top, | |
1296 HeapWord* const new_top) | |
1297 { | |
1298 ParallelCompactData& sd = summary_data(); | |
1299 | |
1300 assert(cp != NULL, "sanity"); | |
1301 assert(bottom != NULL, "sanity"); | |
1302 assert(top != NULL, "sanity"); | |
1303 assert(new_top != NULL, "sanity"); | |
1304 assert(top >= new_top, "summary data problem?"); | |
1305 assert(new_top > bottom, "space is empty; should not be here"); | |
1306 assert(new_top >= cp->destination(), "sanity"); | |
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1307 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1308 |
1309 HeapWord* const destination = cp->destination(); | |
1310 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1311 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1312 const size_t compacted_region_used = pointer_delta(top, |
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1313 sd.region_to_addr(cp)); |
0 | 1314 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1315 | |
1316 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1317 return double(reclaimable) / divisor; | |
1318 } | |
1319 | |
1320 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1321 // compacted region. The address is always on a region boundary. |
0 | 1322 // |
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1323 // Completely full regions at the left are skipped, since no compaction can |
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1324 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1325 // computed, based on the density (amount live / capacity) of the generation; |
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1326 // the region with approximately that amount of dead space to the left is |
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1327 // identified as the limit region. Regions between the last completely full |
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1328 // region and the limit region are scanned and the one that has the best |
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1329 // (maximum) reclaimed_ratio() is selected. |
0 | 1330 HeapWord* |
1331 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1332 bool maximum_compaction) | |
1333 { | |
483
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1334 if (ParallelOldGCSplitALot) { |
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1335 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1336 // The value was chosen to provoke splitting a young gen space; use it. |
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1337 return _space_info[id].dense_prefix(); |
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1338 } |
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1339 } |
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1340 |
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1341 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1342 const ParallelCompactData& sd = summary_data(); |
1343 | |
1344 const MutableSpace* const space = _space_info[id].space(); | |
1345 HeapWord* const top = space->top(); | |
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1346 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1347 HeapWord* const new_top = _space_info[id].new_top(); |
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1348 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1349 HeapWord* const bottom = space->bottom(); |
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1350 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1351 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1352 const RegionData* const new_top_cp = |
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1353 sd.addr_to_region_ptr(new_top_aligned_up); |
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1354 |
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1355 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1356 // of the dense prefix. |
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1357 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1358 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1359 space->is_empty(), "no dead space allowed to the left"); |
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1360 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1361 "region must have dead space"); |
0 | 1362 |
1363 // The gc number is saved whenever a maximum compaction is done, and used to | |
1364 // determine when the maximum compaction interval has expired. This avoids | |
1365 // successive max compactions for different reasons. | |
1366 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1367 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1368 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1369 total_invocations() == HeapFirstMaximumCompactionCount; | |
1370 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1371 _maximum_compaction_gc_num = total_invocations(); | |
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1372 return sd.region_to_addr(full_cp); |
0 | 1373 } |
1374 | |
1375 const size_t space_live = pointer_delta(new_top, bottom); | |
1376 const size_t space_used = space->used_in_words(); | |
1377 const size_t space_capacity = space->capacity_in_words(); | |
1378 | |
1379 const double density = double(space_live) / double(space_capacity); | |
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1380 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1381 const double limiter = dead_wood_limiter(density, min_percent_free); |
1382 const size_t dead_wood_max = space_used - space_live; | |
1383 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1384 dead_wood_max); | |
1385 | |
1386 if (TraceParallelOldGCDensePrefix) { | |
1387 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1388 "space_cap=" SIZE_FORMAT, | |
1389 space_live, space_used, | |
1390 space_capacity); | |
1391 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1392 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1393 density, min_percent_free, limiter, | |
1394 dead_wood_max, dead_wood_limit); | |
1395 } | |
1396 | |
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1397 // Locate the region with the desired amount of dead space to the left. |
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1398 const RegionData* const limit_cp = |
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1399 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1400 |
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1401 // Scan from the first region with dead space to the limit region and find the |
0 | 1402 // one with the best (largest) reclaimed ratio. |
1403 double best_ratio = 0.0; | |
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1404 const RegionData* best_cp = full_cp; |
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1405 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1406 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1407 if (tmp_ratio > best_ratio) { | |
1408 best_cp = cp; | |
1409 best_ratio = tmp_ratio; | |
1410 } | |
1411 } | |
1412 | |
1413 #if 0 | |
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1414 // Something to consider: if the region with the best ratio is 'close to' the |
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1415 // first region w/free space, choose the first region with free space |
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1416 // ("first-free"). The first-free region is usually near the start of the |
0 | 1417 // heap, which means we are copying most of the heap already, so copy a bit |
1418 // more to get complete compaction. | |
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1419 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1420 _maximum_compaction_gc_num = total_invocations(); |
1421 best_cp = full_cp; | |
1422 } | |
1423 #endif // #if 0 | |
1424 | |
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1425 return sd.region_to_addr(best_cp); |
0 | 1426 } |
1427 | |
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1428 #ifndef PRODUCT |
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1429 void |
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1430 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1431 size_t words) |
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1432 { |
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1433 if (TraceParallelOldGCSummaryPhase) { |
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1434 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1435 SIZE_FORMAT, start, start + words, words); |
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1436 } |
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1437 |
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1438 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1439 CollectedHeap::fill_with_objects(start, words); |
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1440 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1441 _mark_bitmap.mark_obj(p, words); |
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1442 _summary_data.add_obj(p, words); |
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1443 start_array->allocate_block(p); |
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1444 } |
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1445 } |
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1446 |
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1447 void |
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1448 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1449 { |
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1450 ParallelCompactData& sd = summary_data(); |
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1451 MutableSpace* space = _space_info[id].space(); |
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1452 |
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1453 // Find the source and destination start addresses. |
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1454 HeapWord* const src_addr = sd.region_align_down(start); |
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1455 HeapWord* dst_addr; |
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1456 if (src_addr < start) { |
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1457 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1458 } else if (src_addr > space->bottom()) { |
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1459 // The start (the original top() value) is aligned to a region boundary so |
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1460 // the associated region does not have a destination. Compute the |
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1461 // destination from the previous region. |
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1462 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1463 dst_addr = cp->destination() + cp->data_size(); |
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1464 } else { |
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1465 // Filling the entire space. |
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1466 dst_addr = space->bottom(); |
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1467 } |
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1468 assert(dst_addr != NULL, "sanity"); |
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1469 |
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1470 // Update the summary data. |
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1471 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1472 src_addr, space->top(), NULL, |
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1473 dst_addr, space->end(), |
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1474 _space_info[id].new_top_addr()); |
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1475 assert(result, "should not fail: bad filler object size"); |
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1476 } |
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1477 |
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1478 void |
496
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1479 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1480 { |
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1481 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1482 return; |
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1483 } |
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1484 |
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1485 MutableSpace* const space = _space_info[id].space(); |
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1486 if (space->is_empty()) { |
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1487 HeapWord* b = space->bottom(); |
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1488 HeapWord* t = b + space->capacity_in_words() / 2; |
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1489 space->set_top(t); |
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1490 if (ZapUnusedHeapArea) { |
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1491 space->set_top_for_allocations(); |
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1492 } |
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1493 |
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1494 size_t min_size = CollectedHeap::min_fill_size(); |
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1495 size_t obj_len = min_size; |
496
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1496 while (b + obj_len <= t) { |
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1497 CollectedHeap::fill_with_object(b, obj_len); |
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1498 mark_bitmap()->mark_obj(b, obj_len); |
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1499 summary_data().add_obj(b, obj_len); |
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1500 b += obj_len; |
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1501 obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ... |
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1502 } |
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1503 if (b < t) { |
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1504 // The loop didn't completely fill to t (top); adjust top downward. |
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1505 space->set_top(b); |
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1506 if (ZapUnusedHeapArea) { |
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1507 space->set_top_for_allocations(); |
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1508 } |
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1509 } |
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1510 |
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1511 HeapWord** nta = _space_info[id].new_top_addr(); |
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1512 bool result = summary_data().summarize(_space_info[id].split_info(), |
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1513 space->bottom(), space->top(), NULL, |
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1514 space->bottom(), space->end(), nta); |
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1515 assert(result, "space must fit into itself"); |
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1516 } |
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1517 } |
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1518 |
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1519 void |
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1520 PSParallelCompact::provoke_split(bool & max_compaction) |
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1521 { |
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1522 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
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1523 return; |
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1524 } |
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1525 |
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1526 const size_t region_size = ParallelCompactData::RegionSize; |
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1527 ParallelCompactData& sd = summary_data(); |
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1528 |
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1529 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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1530 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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1531 const size_t eden_live = pointer_delta(eden_space->top(), |
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1532 _space_info[eden_space_id].new_top()); |
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1533 const size_t from_live = pointer_delta(from_space->top(), |
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1534 _space_info[from_space_id].new_top()); |
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1535 |
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1536 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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1537 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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1538 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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1539 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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1540 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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1541 |
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1542 // Choose the space to split; need at least 2 regions live (or fillable). |
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1543 SpaceId id; |
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1544 MutableSpace* space; |
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1545 size_t live_words; |
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1546 size_t fill_words; |
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1547 if (eden_live + eden_fillable >= region_size * 2) { |
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1548 id = eden_space_id; |
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1549 space = eden_space; |
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1550 live_words = eden_live; |
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1551 fill_words = eden_fillable; |
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1552 } else if (from_live + from_fillable >= region_size * 2) { |
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1553 id = from_space_id; |
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1554 space = from_space; |
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1555 live_words = from_live; |
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1556 fill_words = from_fillable; |
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1557 } else { |
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1558 return; // Give up. |
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1559 } |
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1560 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
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1561 |
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1562 if (live_words < region_size * 2) { |
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1563 // Fill from top() to end() w/live objects of mixed sizes. |
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1564 HeapWord* const fill_start = space->top(); |
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1565 live_words += fill_words; |
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1566 |
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1567 space->set_top(fill_start + fill_words); |
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1568 if (ZapUnusedHeapArea) { |
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1569 space->set_top_for_allocations(); |
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1570 } |
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1571 |
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1572 HeapWord* cur_addr = fill_start; |
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1573 while (fill_words > 0) { |
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1574 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1575 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1576 if (fill_words - cur_size < min_fill_size) { |
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1577 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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1578 } |
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1579 |
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1580 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1581 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1582 sd.add_obj(cur_addr, cur_size); |
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1583 |
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1584 cur_addr += cur_size; |
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1585 fill_words -= cur_size; |
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1586 } |
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1587 |
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1588 summarize_new_objects(id, fill_start); |
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1589 } |
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1590 |
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1591 max_compaction = false; |
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1592 |
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1593 // Manipulate the old gen so that it has room for about half of the live data |
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1594 // in the target young gen space (live_words / 2). |
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1595 id = old_space_id; |
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1596 space = _space_info[id].space(); |
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1597 const size_t free_at_end = space->free_in_words(); |
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1598 const size_t free_target = align_object_size(live_words / 2); |
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1599 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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1600 |
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1601 if (free_at_end >= free_target + min_fill_size) { |
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1602 // Fill space above top() and set the dense prefix so everything survives. |
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1603 HeapWord* const fill_start = space->top(); |
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1604 const size_t fill_size = free_at_end - free_target; |
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1605 space->set_top(space->top() + fill_size); |
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1606 if (ZapUnusedHeapArea) { |
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1607 space->set_top_for_allocations(); |
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1608 } |
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1609 fill_with_live_objects(id, fill_start, fill_size); |
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1610 summarize_new_objects(id, fill_start); |
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1611 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1612 } else if (dead + free_at_end > free_target) { |
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1613 // Find a dense prefix that makes the right amount of space available. |
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1614 HeapWord* cur = sd.region_align_down(space->top()); |
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1615 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1616 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1617 while (dead_to_right < free_target) { |
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1618 cur -= region_size; |
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1619 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1620 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1621 } |
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1622 _space_info[id].set_dense_prefix(cur); |
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1623 } |
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1624 } |
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1625 #endif // #ifndef PRODUCT |
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1626 |
0 | 1627 void PSParallelCompact::summarize_spaces_quick() |
1628 { | |
1629 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1630 const MutableSpace* space = _space_info[i].space(); | |
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1631 HeapWord** nta = _space_info[i].new_top_addr(); |
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1632 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1633 space->bottom(), space->top(), NULL, |
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1634 space->bottom(), space->end(), nta); |
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1635 assert(result, "space must fit into itself"); |
0 | 1636 _space_info[i].set_dense_prefix(space->bottom()); |
1637 } | |
496
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1638 |
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1639 #ifndef PRODUCT |
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1640 if (ParallelOldGCSplitALot) { |
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1641 provoke_split_fill_survivor(to_space_id); |
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1642 } |
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1643 #endif // #ifndef PRODUCT |
0 | 1644 } |
1645 | |
1646 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1647 { | |
1648 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1649 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1650 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
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1651 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1652 // Only enough dead space is filled so that any remaining dead space to the |
1653 // left is larger than the minimum filler object. (The remainder is filled | |
1654 // during the copy/update phase.) | |
1655 // | |
1656 // The size of the dead space to the right of the boundary is not a | |
1657 // concern, since compaction will be able to use whatever space is | |
1658 // available. | |
1659 // | |
1660 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1661 // surrounds the space to be filled with an object. | |
1662 // | |
1663 // In the 32-bit VM, each bit represents two 32-bit words: | |
1664 // +---+ | |
1665 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1666 // end_bits: ... x x x | 0 | || 0 x x ... | |
1667 // +---+ | |
1668 // | |
1669 // In the 64-bit VM, each bit represents one 64-bit word: | |
1670 // +------------+ | |
1671 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1672 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1673 // +------------+ | |
1674 // +-------+ | |
1675 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1676 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1677 // +-------+ | |
1678 // +-----------+ | |
1679 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1680 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1681 // +-----------+ | |
1682 // +-------+ | |
1683 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1684 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1685 // +-------+ | |
1686 | |
1687 // Initially assume case a, c or e will apply. | |
1571
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1688 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1689 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1690 | |
1691 #ifdef _LP64 | |
1571
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1692 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1693 // Cases a, c or e. |
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1694 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1695 // Case b above. |
1696 obj_beg = dense_prefix_end - 1; | |
1697 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1698 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1699 // Case d above. | |
1700 obj_beg = dense_prefix_end - 3; | |
1701 obj_len = 3; | |
1702 } | |
1703 #endif // #ifdef _LP64 | |
1704 | |
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1705 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1706 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1707 _summary_data.add_obj(obj_beg, obj_len); | |
1708 assert(start_array(id) != NULL, "sanity"); | |
1709 start_array(id)->allocate_block(obj_beg); | |
1710 } | |
1711 } | |
1712 | |
1713 void | |
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1714 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1715 { |
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1716 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1717 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1718 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1719 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1720 cur->set_source_region(0); |
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1721 } |
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1722 } |
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1723 |
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1724 void |
0 | 1725 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1726 { | |
1727 assert(id < last_space_id, "id out of range"); | |
483
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1728 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1729 ParallelOldGCSplitALot && id == old_space_id, |
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1730 "should have been reset in summarize_spaces_quick()"); |
0 | 1731 |
1732 const MutableSpace* space = _space_info[id].space(); | |
265
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1733 if (_space_info[id].new_top() != space->bottom()) { |
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1734 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1735 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1736 |
1737 #ifndef PRODUCT | |
265
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1738 if (TraceParallelOldGCDensePrefix) { |
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1739 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1740 dense_prefix_end); |
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1741 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1742 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1743 } |
0 | 1744 #endif // #ifndef PRODUCT |
1745 | |
483
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1746 // Recompute the summary data, taking into account the dense prefix. If |
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1747 // every last byte will be reclaimed, then the existing summary data which |
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1748 // compacts everything can be left in place. |
265
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1749 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1750 // If dead space crosses the dense prefix boundary, it is (at least |
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1751 // partially) filled with a dummy object, marked live and added to the |
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1752 // summary data. This simplifies the copy/update phase and must be done |
483
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1753 // before the final locations of objects are determined, to prevent |
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1754 // leaving a fragment of dead space that is too small to fill. |
265
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1755 fill_dense_prefix_end(id); |
482
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1756 |
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1757 // Compute the destination of each Region, and thus each object. |
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1758 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1759 _summary_data.summarize(_space_info[id].split_info(), |
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1760 dense_prefix_end, space->top(), NULL, |
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1761 dense_prefix_end, space->end(), |
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1762 _space_info[id].new_top_addr()); |
265
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1763 } |
0 | 1764 } |
1765 | |
1766 if (TraceParallelOldGCSummaryPhase) { | |
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1767 const size_t region_size = ParallelCompactData::RegionSize; |
265
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1768 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
375
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1769 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1770 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1771 HeapWord* const new_top = _space_info[id].new_top(); |
375
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1772 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1773 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1774 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
375
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1775 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1776 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1777 id, space->capacity_in_words(), dense_prefix_end, | |
375
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1778 dp_region, dp_words / region_size, |
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1779 cr_words / region_size, new_top); |
0 | 1780 } |
1781 } | |
1782 | |
482
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1783 #ifndef PRODUCT |
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1784 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1785 HeapWord* dst_beg, HeapWord* dst_end, |
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1786 SpaceId src_space_id, |
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1787 HeapWord* src_beg, HeapWord* src_end) |
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1788 { |
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1789 if (TraceParallelOldGCSummaryPhase) { |
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1790 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1791 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1792 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1793 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1794 SIZE_FORMAT "-" SIZE_FORMAT, |
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1795 src_space_id, space_names[src_space_id], |
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1796 dst_space_id, space_names[dst_space_id], |
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1797 src_beg, src_end, |
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1798 _summary_data.addr_to_region_idx(src_beg), |
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1799 _summary_data.addr_to_region_idx(src_end), |
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1800 dst_beg, dst_end, |
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1801 _summary_data.addr_to_region_idx(dst_beg), |
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1802 _summary_data.addr_to_region_idx(dst_end)); |
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1803 } |
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1804 } |
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1805 #endif // #ifndef PRODUCT |
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1806 |
0 | 1807 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1808 bool maximum_compaction) | |
1809 { | |
1810 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1811 // trace("2"); | |
1812 | |
1813 #ifdef ASSERT | |
1814 if (TraceParallelOldGCMarkingPhase) { | |
1815 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1816 "add_obj_bytes=" SIZE_FORMAT, | |
1817 add_obj_count, add_obj_size * HeapWordSize); | |
1818 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1819 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1820 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1821 } | |
1822 #endif // #ifdef ASSERT | |
1823 | |
1824 // Quick summarization of each space into itself, to see how much is live. | |
1825 summarize_spaces_quick(); | |
1826 | |
1827 if (TraceParallelOldGCSummaryPhase) { | |
1828 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1829 Universe::print(); | |
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1830 NOT_PRODUCT(print_region_ranges()); |
0 | 1831 if (Verbose) { |
1832 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1833 } | |
1834 } | |
1835 | |
1836 // The amount of live data that will end up in old space (assuming it fits). | |
1837 size_t old_space_total_live = 0; | |
482
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1838 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1839 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1840 _space_info[id].space()->bottom()); | |
1841 } | |
1842 | |
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1843 MutableSpace* const old_space = _space_info[old_space_id].space(); |
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1844 const size_t old_capacity = old_space->capacity_in_words(); |
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1845 if (old_space_total_live > old_capacity) { |
0 | 1846 // XXX - should also try to expand |
1847 maximum_compaction = true; | |
1848 } | |
483
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1849 #ifndef PRODUCT |
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1850 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1851 provoke_split(maximum_compaction); |
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1852 } |
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1853 #endif // #ifndef PRODUCT |
0 | 1854 |
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1855 // Old generations. |
0 | 1856 summarize_space(old_space_id, maximum_compaction); |
1857 | |
482
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1858 // Summarize the remaining spaces in the young gen. The initial target space |
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1859 // is the old gen. If a space does not fit entirely into the target, then the |
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1860 // remainder is compacted into the space itself and that space becomes the new |
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1861 // target. |
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1862 SpaceId dst_space_id = old_space_id; |
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1863 HeapWord* dst_space_end = old_space->end(); |
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1864 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1865 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1866 const MutableSpace* space = _space_info[id].space(); |
1867 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1868 space->bottom()); | |
482
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1869 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1870 |
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1871 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1872 SpaceId(id), space->bottom(), space->top());) |
266
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1873 if (live > 0 && live <= available) { |
0 | 1874 // All the live data will fit. |
482
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1875 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1876 space->bottom(), space->top(), |
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1877 NULL, |
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1878 *new_top_addr, dst_space_end, |
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1879 new_top_addr); |
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1880 assert(done, "space must fit into old gen"); |
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1881 |
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1882 // Reset the new_top value for the space. |
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1883 _space_info[id].set_new_top(space->bottom()); |
482
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1884 } else if (live > 0) { |
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1885 // Attempt to fit part of the source space into the target space. |
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1886 HeapWord* next_src_addr = NULL; |
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1887 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1888 space->bottom(), space->top(), |
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1889 &next_src_addr, |
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1890 *new_top_addr, dst_space_end, |
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1891 new_top_addr); |
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1892 assert(!done, "space should not fit into old gen"); |
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1893 assert(next_src_addr != NULL, "sanity"); |
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1894 |
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1895 // The source space becomes the new target, so the remainder is compacted |
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1896 // within the space itself. |
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1897 dst_space_id = SpaceId(id); |
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1898 dst_space_end = space->end(); |
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1899 new_top_addr = _space_info[id].new_top_addr(); |
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1900 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1901 space->bottom(), dst_space_end, |
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1902 SpaceId(id), next_src_addr, space->top());) |
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1903 done = _summary_data.summarize(_space_info[id].split_info(), |
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1904 next_src_addr, space->top(), |
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1905 NULL, |
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1906 space->bottom(), dst_space_end, |
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1907 new_top_addr); |
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1908 assert(done, "space must fit when compacted into itself"); |
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1909 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1910 } |
1911 } | |
1912 | |
1913 if (TraceParallelOldGCSummaryPhase) { | |
1914 tty->print_cr("summary_phase: after final summarization"); | |
1915 Universe::print(); | |
375
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1916 NOT_PRODUCT(print_region_ranges()); |
0 | 1917 if (Verbose) { |
1918 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1919 } | |
1920 } | |
1921 } | |
1922 | |
1923 // This method should contain all heap-specific policy for invoking a full | |
1924 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1925 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1926 // before full gc, or any other specialized behavior, it needs to be added here. | |
1927 // | |
1928 // Note that this method should only be called from the vm_thread while at a | |
1929 // safepoint. | |
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1930 // |
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1931 // Note that the all_soft_refs_clear flag in the collector policy |
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1932 // may be true because this method can be called without intervening |
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1933 // activity. For example when the heap space is tight and full measure |
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1934 // are being taken to free space. |
0 | 1935 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1936 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1937 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1938 "should be in vm thread"); | |
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1939 |
0 | 1940 ParallelScavengeHeap* heap = gc_heap(); |
1941 GCCause::Cause gc_cause = heap->gc_cause(); | |
1942 assert(!heap->is_gc_active(), "not reentrant"); | |
1943 | |
1944 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1945 IsGCActiveMark mark; |
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1946 |
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1947 if (ScavengeBeforeFullGC) { |
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1948 PSScavenge::invoke_no_policy(); |
0 | 1949 } |
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1950 |
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1951 const bool clear_all_soft_refs = |
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1952 heap->collector_policy()->should_clear_all_soft_refs(); |
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1953 |
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1954 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1955 maximum_heap_compaction); |
0 | 1956 } |
1957 | |
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1958 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1959 size_t addr_region_index = addr_to_region_idx(addr); |
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1960 return region_index == addr_region_index; |
0 | 1961 } |
1962 | |
1963 // This method contains no policy. You should probably | |
1964 // be calling invoke() instead. | |
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1965 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 1966 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
1967 assert(ref_processor() != NULL, "Sanity"); | |
1968 | |
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1969 if (GC_locker::check_active_before_gc()) { |
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1970 return false; |
0 | 1971 } |
1972 | |
1973 TimeStamp marking_start; | |
1974 TimeStamp compaction_start; | |
1975 TimeStamp collection_exit; | |
1976 | |
1977 ParallelScavengeHeap* heap = gc_heap(); | |
1978 GCCause::Cause gc_cause = heap->gc_cause(); | |
1979 PSYoungGen* young_gen = heap->young_gen(); | |
1980 PSOldGen* old_gen = heap->old_gen(); | |
1981 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
1982 | |
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1983 // The scope of casr should end after code that can change |
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1984 // CollectorPolicy::_should_clear_all_soft_refs. |
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1985 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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1986 heap->collector_policy()); |
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1987 |
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1988 if (ZapUnusedHeapArea) { |
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1989 // Save information needed to minimize mangling |
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1990 heap->record_gen_tops_before_GC(); |
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1991 } |
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1992 |
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1993 heap->pre_full_gc_dump(); |
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1994 |
0 | 1995 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
1996 | |
1997 // Make sure data structures are sane, make the heap parsable, and do other | |
1998 // miscellaneous bookkeeping. | |
1999 PreGCValues pre_gc_values; | |
2000 pre_compact(&pre_gc_values); | |
2001 | |
210 | 2002 // Get the compaction manager reserved for the VM thread. |
2003 ParCompactionManager* const vmthread_cm = | |
2004 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2005 | |
0 | 2006 // Place after pre_compact() where the number of invocations is incremented. |
2007 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2008 | |
2009 { | |
2010 ResourceMark rm; | |
2011 HandleMark hm; | |
2012 | |
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2013 // Set the number of GC threads to be used in this collection |
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2014 gc_task_manager()->set_active_gang(); |
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2015 gc_task_manager()->task_idle_workers(); |
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2016 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2017 |
0 | 2018 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2019 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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2020 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 2021 TraceCollectorStats tcs(counters()); |
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2022 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2023 |
2024 if (TraceGen1Time) accumulated_time()->start(); | |
2025 | |
2026 // Let the size policy know we're starting | |
2027 size_policy->major_collection_begin(); | |
2028 | |
2029 CodeCache::gc_prologue(); | |
2030 Threads::gc_prologue(); | |
2031 | |
2032 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2033 | |
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2034 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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2035 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2036 |
2037 bool marked_for_unloading = false; | |
2038 | |
2039 marking_start.update(); | |
210 | 2040 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2041 |
2042 #ifndef PRODUCT | |
2043 if (TraceParallelOldGCMarkingPhase) { | |
2044 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
2045 "cas_by_another %d", | |
2046 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
2047 mark_bitmap()->cas_by_another()); | |
2048 } | |
2049 #endif // #ifndef PRODUCT | |
2050 | |
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2051 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2052 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2053 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2054 |
2055 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2056 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2057 | |
2058 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2059 // needed by the compaction for filling holes in the dense prefix. | |
2060 adjust_roots(); | |
2061 | |
2062 compaction_start.update(); | |
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2063 compact(); |
0 | 2064 |
2065 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2066 // done before resizing. | |
2067 post_compact(); | |
2068 | |
2069 // Let the size policy know we're done | |
2070 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2071 | |
2072 if (UseAdaptiveSizePolicy) { | |
2073 if (PrintAdaptiveSizePolicy) { | |
2074 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2075 gclog_or_tty->stamp(); | |
2076 gclog_or_tty->print_cr(" collection: %d ", | |
2077 heap->total_collections()); | |
2078 if (Verbose) { | |
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2079 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2080 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2081 } |
2082 } | |
2083 | |
2084 // Don't check if the size_policy is ready here. Let | |
2085 // the size_policy check that internally. | |
2086 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2087 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2088 UseAdaptiveSizePolicyWithSystemGC)) { | |
2089 // Calculate optimal free space amounts | |
2090 assert(young_gen->max_size() > | |
2091 young_gen->from_space()->capacity_in_bytes() + | |
2092 young_gen->to_space()->capacity_in_bytes(), | |
2093 "Sizes of space in young gen are out-of-bounds"); | |
2094 size_t max_eden_size = young_gen->max_size() - | |
2095 young_gen->from_space()->capacity_in_bytes() - | |
2096 young_gen->to_space()->capacity_in_bytes(); | |
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2097 size_policy->compute_generation_free_space( |
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2098 young_gen->used_in_bytes(), |
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2099 young_gen->eden_space()->used_in_bytes(), |
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2100 old_gen->used_in_bytes(), |
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2101 young_gen->eden_space()->capacity_in_bytes(), |
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2102 old_gen->max_gen_size(), |
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2103 max_eden_size, |
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2104 true /* full gc*/, |
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2105 gc_cause, |
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2106 heap->collector_policy()); |
263
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2107 |
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2108 heap->resize_old_gen( |
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2109 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2110 |
2111 // Don't resize the young generation at an major collection. A | |
2112 // desired young generation size may have been calculated but | |
2113 // resizing the young generation complicates the code because the | |
2114 // resizing of the old generation may have moved the boundary | |
2115 // between the young generation and the old generation. Let the | |
2116 // young generation resizing happen at the minor collections. | |
2117 } | |
2118 if (PrintAdaptiveSizePolicy) { | |
2119 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2120 heap->total_collections()); | |
2121 } | |
2122 } | |
2123 | |
2124 if (UsePerfData) { | |
2125 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2126 counters->update_counters(); | |
2127 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2128 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2129 } | |
2130 | |
2131 heap->resize_all_tlabs(); | |
2132 | |
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2133 // Resize the metaspace capactiy after a collection |
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2134 MetaspaceGC::compute_new_size(); |
0 | 2135 |
2136 if (TraceGen1Time) accumulated_time()->stop(); | |
2137 | |
2138 if (PrintGC) { | |
2139 if (PrintGCDetails) { | |
2140 // No GC timestamp here. This is after GC so it would be confusing. | |
2141 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2142 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2143 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2144 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2145 } else { |
2146 heap->print_heap_change(pre_gc_values.heap_used()); | |
2147 } | |
2148 } | |
2149 | |
2150 // Track memory usage and detect low memory | |
2151 MemoryService::track_memory_usage(); | |
2152 heap->update_counters(); | |
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2153 gc_task_manager()->release_idle_workers(); |
0 | 2154 } |
2155 | |
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2156 #ifdef ASSERT |
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2157 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2158 ParCompactionManager* const cm = |
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2159 ParCompactionManager::manager_array(int(i)); |
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2160 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2161 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
1836
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2162 } |
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2163 #endif // ASSERT |
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2164 |
0 | 2165 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2166 HandleMark hm; // Discard invalid handles created during verification | |
2167 gclog_or_tty->print(" VerifyAfterGC:"); | |
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2168 Universe::verify(); |
0 | 2169 } |
2170 | |
2171 // Re-verify object start arrays | |
2172 if (VerifyObjectStartArray && | |
2173 VerifyAfterGC) { | |
2174 old_gen->verify_object_start_array(); | |
2175 } | |
2176 | |
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2177 if (ZapUnusedHeapArea) { |
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2178 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2179 } |
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2180 |
0 | 2181 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2182 | |
2183 collection_exit.update(); | |
2184 | |
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2185 heap->print_heap_after_gc(); |
0 | 2186 if (PrintGCTaskTimeStamps) { |
2187 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2188 INT64_FORMAT, | |
2189 marking_start.ticks(), compaction_start.ticks(), | |
2190 collection_exit.ticks()); | |
2191 gc_task_manager()->print_task_time_stamps(); | |
2192 } | |
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2193 |
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2194 heap->post_full_gc_dump(); |
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2195 |
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2196 #ifdef TRACESPINNING |
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2197 ParallelTaskTerminator::print_termination_counts(); |
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2198 #endif |
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2199 |
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2200 return true; |
0 | 2201 } |
2202 | |
2203 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2204 PSYoungGen* young_gen, | |
2205 PSOldGen* old_gen) { | |
2206 MutableSpace* const eden_space = young_gen->eden_space(); | |
2207 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2208 assert(young_gen->virtual_space()->alignment() == | |
2209 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2210 | |
2211 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2212 return false; | |
2213 } | |
2214 | |
2215 // Both generations must be completely committed. | |
2216 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2217 return false; | |
2218 } | |
2219 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2220 return false; | |
2221 } | |
2222 | |
2223 // Figure out how much to take from eden. Include the average amount promoted | |
2224 // in the total; otherwise the next young gen GC will simply bail out to a | |
2225 // full GC. | |
2226 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2227 const size_t eden_used = eden_space->used_in_bytes(); | |
2228 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2229 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2230 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2231 | |
2232 if (absorb_size >= eden_capacity) { | |
2233 return false; // Must leave some space in eden. | |
2234 } | |
2235 | |
2236 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2237 if (new_young_size < young_gen->min_gen_size()) { | |
2238 return false; // Respect young gen minimum size. | |
2239 } | |
2240 | |
2241 if (TraceAdaptiveGCBoundary && Verbose) { | |
2242 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2243 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2244 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2245 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2246 absorb_size / K, | |
2247 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2248 young_gen->from_space()->used_in_bytes() / K, | |
2249 young_gen->to_space()->used_in_bytes() / K, | |
2250 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2251 } | |
2252 | |
2253 // Fill the unused part of the old gen. | |
2254 MutableSpace* const old_space = old_gen->object_space(); | |
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2255 HeapWord* const unused_start = old_space->top(); |
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2256 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2257 |
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2258 if (unused_words > 0) { |
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2259 if (unused_words < CollectedHeap::min_fill_size()) { |
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2260 return false; // If the old gen cannot be filled, must give up. |
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2261 } |
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2262 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2263 } |
2264 | |
2265 // Take the live data from eden and set both top and end in the old gen to | |
2266 // eden top. (Need to set end because reset_after_change() mangles the region | |
2267 // from end to virtual_space->high() in debug builds). | |
2268 HeapWord* const new_top = eden_space->top(); | |
2269 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2270 absorb_size); | |
2271 young_gen->reset_after_change(); | |
2272 old_space->set_top(new_top); | |
2273 old_space->set_end(new_top); | |
2274 old_gen->reset_after_change(); | |
2275 | |
2276 // Update the object start array for the filler object and the data from eden. | |
2277 ObjectStartArray* const start_array = old_gen->start_array(); | |
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2278 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2279 start_array->allocate_block(p); |
0 | 2280 } |
2281 | |
2282 // Could update the promoted average here, but it is not typically updated at | |
2283 // full GCs and the value to use is unclear. Something like | |
2284 // | |
2285 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2286 | |
2287 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2288 return true; | |
2289 } | |
2290 | |
2291 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2292 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2293 "shouldn't return NULL"); | |
2294 return ParallelScavengeHeap::gc_task_manager(); | |
2295 } | |
2296 | |
2297 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2298 bool maximum_heap_compaction) { | |
2299 // Recursively traverse all live objects and mark them | |
2300 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2301 | |
2302 ParallelScavengeHeap* heap = gc_heap(); | |
2303 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2304 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2305 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2306 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2307 |
2308 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2309 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2310 | |
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2311 // Need new claim bits before marking starts. |
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2312 ClassLoaderDataGraph::clear_claimed_marks(); |
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2313 |
0 | 2314 { |
2315 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
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2316 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2317 |
2318 GCTaskQueue* q = GCTaskQueue::create(); | |
2319 | |
2320 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2321 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2322 // We scan the thread roots in parallel | |
2323 Threads::create_thread_roots_marking_tasks(q); | |
2324 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2325 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2326 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2327 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2328 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2329 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2330 |
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2331 if (active_gc_threads > 1) { |
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2332 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2333 q->enqueue(new StealMarkingTask(&terminator)); |
2334 } | |
2335 } | |
2336 | |
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2337 gc_task_manager()->execute_and_wait(q); |
0 | 2338 } |
2339 | |
2340 // Process reference objects found during marking | |
2341 { | |
2342 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2343 if (ref_processor()->processing_is_mt()) { | |
2344 RefProcTaskExecutor task_executor; | |
2345 ref_processor()->process_discovered_references( | |
453
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2346 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2347 &task_executor); |
0 | 2348 } else { |
2349 ref_processor()->process_discovered_references( | |
453
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2350 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2351 } |
2352 } | |
2353 | |
2354 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2355 // Follow system dictionary roots and unload classes. | |
2356 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2357 | |
2358 // Follow code cache roots. | |
6787
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2359 CodeCache::do_unloading(is_alive_closure(), purged_class); |
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2360 cm->follow_marking_stacks(); // Flush marking stack. |
0 | 2361 |
2362 // Update subklass/sibling/implementor links of live klasses | |
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2363 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2364 |
2177
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2365 // Visit interned string tables and delete unmarked oops |
0 | 2366 StringTable::unlink(is_alive_closure()); |
2177
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2367 // Clean up unreferenced symbols in symbol table. |
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2368 SymbolTable::unlink(); |
0 | 2369 |
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2370 assert(cm->marking_stacks_empty(), "marking stacks should be empty"); |
0 | 2371 } |
2372 | |
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2373 void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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2374 ClassLoaderData* cld = klass->class_loader_data(); |
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2375 // The actual processing of the klass is done when we |
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2376 // traverse the list of Klasses in the class loader data. |
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2377 PSParallelCompact::follow_class_loader(cm, cld); |
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2378 } |
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2379 |
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2380 void PSParallelCompact::adjust_klass(ParCompactionManager* cm, Klass* klass) { |
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2381 ClassLoaderData* cld = klass->class_loader_data(); |
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2382 // The actual processing of the klass is done when we |
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2383 // traverse the list of Klasses in the class loader data. |
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2384 PSParallelCompact::adjust_class_loader(cm, cld); |
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2385 } |
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2386 |
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2387 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2388 ClassLoaderData* cld) { |
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2389 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2390 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2391 |
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2392 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2393 } |
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2394 |
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2395 void PSParallelCompact::adjust_class_loader(ParCompactionManager* cm, |
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2396 ClassLoaderData* cld) { |
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2397 cld->oops_do(PSParallelCompact::adjust_root_pointer_closure(), |
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2398 PSParallelCompact::adjust_klass_closure(), |
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2399 true); |
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2400 } |
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2401 |
0 | 2402 // This should be moved to the shared markSweep code! |
2403 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2404 public: | |
2405 void do_object(oop p) { ShouldNotReachHere(); } | |
2406 bool do_object_b(oop p) { return true; } | |
2407 }; | |
2408 static PSAlwaysTrueClosure always_true; | |
2409 | |
2410 void PSParallelCompact::adjust_roots() { | |
2411 // Adjust the pointers to reflect the new locations | |
2412 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2413 | |
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2414 // Need new claim bits when tracing through and adjusting pointers. |
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2415 ClassLoaderDataGraph::clear_claimed_marks(); |
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2416 |
0 | 2417 // General strong roots. |
2418 Universe::oops_do(adjust_root_pointer_closure()); | |
2419 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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2420 CLDToOopClosure adjust_from_cld(adjust_root_pointer_closure()); |
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2421 Threads::oops_do(adjust_root_pointer_closure(), &adjust_from_cld, NULL); |
0 | 2422 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
2423 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
2424 Management::oops_do(adjust_root_pointer_closure()); | |
2425 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
2426 // SO_AllClasses | |
2427 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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2428 ClassLoaderDataGraph::oops_do(adjust_root_pointer_closure(), adjust_klass_closure(), true); |
0 | 2429 |
2430 // Now adjust pointers in remaining weak roots. (All of which should | |
2431 // have been cleared if they pointed to non-surviving objects.) | |
2432 // Global (weak) JNI handles | |
2433 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
2434 | |
2435 CodeCache::oops_do(adjust_pointer_closure()); | |
2436 StringTable::oops_do(adjust_root_pointer_closure()); | |
2437 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
2438 // Roots were visited so references into the young gen in roots | |
2439 // may have been scanned. Process them also. | |
2440 // Should the reference processor have a span that excludes | |
2441 // young gen objects? | |
2442 PSScavenge::reference_processor()->weak_oops_do( | |
2443 adjust_root_pointer_closure()); | |
2444 } | |
2445 | |
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2446 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2447 uint parallel_gc_threads) |
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2448 { |
0 | 2449 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2450 | |
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2451 // Find the threads that are active |
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2452 unsigned int which = 0; |
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2453 |
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2454 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2455 for (uint j = 0; j < task_count; j++) { |
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2456 q->enqueue(new DrainStacksCompactionTask(j)); |
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2457 ParCompactionManager::verify_region_list_empty(j); |
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2458 // Set the region stacks variables to "no" region stack values |
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2459 // so that they will be recognized and needing a region stack |
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2460 // in the stealing tasks if they do not get one by executing |
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2461 // a draining stack. |
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2462 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2463 cm->set_region_stack(NULL); |
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2464 cm->set_region_stack_index((uint)max_uintx); |
0 | 2465 } |
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2466 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2467 |
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2468 // Find all regions that are available (can be filled immediately) and |
0 | 2469 // distribute them to the thread stacks. The iteration is done in reverse |
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2470 // order (high to low) so the regions will be removed in ascending order. |
0 | 2471 |
2472 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2473 | |
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2474 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2475 // A region index which corresponds to the tasks created above. |
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2476 // "which" must be 0 <= which < task_count |
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2477 |
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2478 which = 0; |
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2479 // id + 1 is used to test termination so unsigned can |
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2480 // be used with an old_space_id == 0. |
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2481 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2482 SpaceInfo* const space_info = _space_info + id; |
2483 MutableSpace* const space = space_info->space(); | |
2484 HeapWord* const new_top = space_info->new_top(); | |
2485 | |
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2486 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2487 const size_t end_region = |
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2488 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2489 |
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2490 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
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2491 if (sd.region(cur)->claim_unsafe()) { |
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2492 ParCompactionManager::region_list_push(which, cur); |
0 | 2493 |
2494 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2495 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2496 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
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2497 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2498 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2499 } | |
2500 | |
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2501 NOT_PRODUCT(++fillable_regions;) |
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2502 |
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2503 // Assign regions to tasks in round-robin fashion. |
0 | 2504 if (++which == task_count) { |
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2505 assert(which <= parallel_gc_threads, |
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2506 "Inconsistent number of workers"); |
0 | 2507 which = 0; |
2508 } | |
2509 } | |
2510 } | |
2511 } | |
2512 | |
2513 if (TraceParallelOldGCCompactionPhase) { | |
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2514 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2515 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2516 } |
2517 } | |
2518 | |
2519 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2520 | |
2521 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2522 uint parallel_gc_threads) { | |
2523 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2524 | |
2525 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2526 | |
2527 // Iterate over all the spaces adding tasks for updating | |
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2528 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2529 // will work on opening the gaps and the remaining gc threads |
2530 // will work on the dense prefix. | |
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2531 unsigned int space_id; |
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2532 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2533 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2534 const MutableSpace* const space = _space_info[space_id].space(); | |
2535 | |
2536 if (dense_prefix_end == space->bottom()) { | |
2537 // There is no dense prefix for this space. | |
2538 continue; | |
2539 } | |
2540 | |
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2541 // The dense prefix is before this region. |
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2542 size_t region_index_end_dense_prefix = |
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2543 sd.addr_to_region_idx(dense_prefix_end); |
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2544 RegionData* const dense_prefix_cp = |
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2545 sd.region(region_index_end_dense_prefix); |
0 | 2546 assert(dense_prefix_end == space->end() || |
2547 dense_prefix_cp->available() || | |
2548 dense_prefix_cp->claimed(), | |
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2549 "The region after the dense prefix should always be ready to fill"); |
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2550 |
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2551 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2552 |
2553 // Is there dense prefix work? | |
375
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2554 size_t total_dense_prefix_regions = |
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2555 region_index_end_dense_prefix - region_index_start; |
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2556 // How many regions of the dense prefix should be given to |
0 | 2557 // each thread? |
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2558 if (total_dense_prefix_regions > 0) { |
0 | 2559 uint tasks_for_dense_prefix = 1; |
3251
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2560 if (total_dense_prefix_regions <= |
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2561 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2562 // Don't over partition. This assumes that |
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2563 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2564 // so there are not many regions to process. |
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2565 tasks_for_dense_prefix = parallel_gc_threads; |
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2566 } else { |
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2567 // Over partition |
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2568 tasks_for_dense_prefix = parallel_gc_threads * |
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2569 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2570 } |
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2571 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2572 tasks_for_dense_prefix; |
375
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2573 // Give each thread at least 1 region. |
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2574 if (regions_per_thread == 0) { |
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2575 regions_per_thread = 1; |
0 | 2576 } |
2577 | |
2578 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2579 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2580 break; |
2581 } | |
375
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2582 // region_index_end is not processed |
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2583 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2584 region_index_end_dense_prefix); |
482
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2585 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2586 region_index_start, |
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2587 region_index_end)); |
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2588 region_index_start = region_index_end; |
0 | 2589 } |
2590 } | |
2591 // This gets any part of the dense prefix that did not | |
2592 // fit evenly. | |
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2593 if (region_index_start < region_index_end_dense_prefix) { |
482
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2594 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2595 region_index_start, |
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2596 region_index_end_dense_prefix)); |
0 | 2597 } |
482
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2598 } |
0 | 2599 } |
2600 | |
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2601 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2602 GCTaskQueue* q, |
2603 ParallelTaskTerminator* terminator_ptr, | |
2604 uint parallel_gc_threads) { | |
2605 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2606 | |
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2607 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2608 // other threads. |
2609 if (parallel_gc_threads > 1) { | |
2610 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2611 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2612 } |
2613 } | |
2614 } | |
2615 | |
2616 void PSParallelCompact::compact() { | |
2617 // trace("5"); | |
2618 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2619 | |
2620 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2621 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2622 PSOldGen* old_gen = heap->old_gen(); | |
2623 old_gen->start_array()->reset(); | |
2624 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2625 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2626 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2627 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2628 |
2629 GCTaskQueue* q = GCTaskQueue::create(); | |
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2630 enqueue_region_draining_tasks(q, active_gc_threads); |
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2631 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2632 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2633 |
2634 { | |
2635 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2636 | |
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2637 gc_task_manager()->execute_and_wait(q); |
0 | 2638 |
2639 #ifdef ASSERT | |
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2640 // Verify that all regions have been processed before the deferred updates. |
0 | 2641 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2642 verify_complete(SpaceId(id)); | |
2643 } | |
2644 #endif | |
2645 } | |
2646 | |
2647 { | |
2648 // Update the deferred objects, if any. Any compaction manager can be used. | |
2649 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2650 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2651 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2652 update_deferred_objects(cm, SpaceId(id)); | |
2653 } | |
2654 } | |
2655 } | |
2656 | |
2657 #ifdef ASSERT | |
2658 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2659 // All Regions between space bottom() to new_top() should be marked as filled |
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2660 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2661 // should have been emptied). |
2662 ParallelCompactData& sd = summary_data(); | |
2663 SpaceInfo si = _space_info[space_id]; | |
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2664 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2665 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2666 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2667 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2668 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2669 |
2670 bool issued_a_warning = false; | |
2671 | |
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2672 size_t cur_region; |
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2673 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2674 const RegionData* const c = sd.region(cur_region); |
0 | 2675 if (!c->completed()) { |
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2676 warning("region " SIZE_FORMAT " not filled: " |
0 | 2677 "destination_count=" SIZE_FORMAT, |
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2678 cur_region, c->destination_count()); |
0 | 2679 issued_a_warning = true; |
2680 } | |
2681 } | |
2682 | |
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2683 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2684 const RegionData* const c = sd.region(cur_region); |
0 | 2685 if (!c->available()) { |
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2686 warning("region " SIZE_FORMAT " not empty: " |
0 | 2687 "destination_count=" SIZE_FORMAT, |
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2688 cur_region, c->destination_count()); |
0 | 2689 issued_a_warning = true; |
2690 } | |
2691 } | |
2692 | |
2693 if (issued_a_warning) { | |
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2694 print_region_ranges(); |
0 | 2695 } |
2696 } | |
2697 #endif // #ifdef ASSERT | |
2698 | |
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2699 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2700 void |
2701 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2702 SpaceId space_id, | |
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2703 size_t beg_region, |
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2704 size_t end_region) { |
0 | 2705 ParallelCompactData& sd = summary_data(); |
2706 ParMarkBitMap* const mbm = mark_bitmap(); | |
2707 | |
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2708 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2709 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2710 assert(beg_region <= end_region, "bad region range"); |
0 | 2711 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2712 | |
2713 #ifdef ASSERT | |
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2714 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2715 // filled. |
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2716 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2717 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2718 } |
2719 #endif // #ifdef ASSERT | |
2720 | |
2721 if (beg_addr != space(space_id)->bottom()) { | |
2722 // Find the first live object or block of dead space that *starts* in this | |
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2723 // range of regions. If a partial object crosses onto the region, skip it; |
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2724 // it will be marked for 'deferred update' when the object head is |
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2725 // processed. If dead space crosses onto the region, it is also skipped; it |
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2726 // will be filled when the prior region is processed. If neither of those |
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2727 // apply, the first word in the region is the start of a live object or dead |
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2728 // space. |
0 | 2729 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
375
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2730 const RegionData* const cp = sd.region(beg_region); |
0 | 2731 if (cp->partial_obj_size() != 0) { |
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2732 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2733 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2734 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2735 } | |
2736 } | |
2737 | |
2738 if (beg_addr < end_addr) { | |
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2739 // A live object or block of dead space starts in this range of Regions. |
0 | 2740 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2741 | |
2742 // Create closures and iterate. | |
2743 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2744 FillClosure fill_closure(cm, space_id); | |
2745 ParMarkBitMap::IterationStatus status; | |
2746 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2747 dense_prefix_end); | |
2748 if (status == ParMarkBitMap::incomplete) { | |
2749 update_closure.do_addr(update_closure.source()); | |
2750 } | |
2751 } | |
2752 | |
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2753 // Mark the regions as filled. |
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2754 RegionData* const beg_cp = sd.region(beg_region); |
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2755 RegionData* const end_cp = sd.region(end_region); |
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2756 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2757 cp->set_completed(); |
2758 } | |
2759 } | |
2760 | |
2761 // Return the SpaceId for the space containing addr. If addr is not in the | |
2762 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2763 // in the heap and asserts such. | |
2764 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2765 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2766 | |
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2767 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2768 if (_space_info[id].space()->contains(addr)) { |
2769 return SpaceId(id); | |
2770 } | |
2771 } | |
2772 | |
2773 assert(false, "no space contains the addr"); | |
2774 return last_space_id; | |
2775 } | |
2776 | |
2777 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2778 SpaceId id) { | |
2779 assert(id < last_space_id, "bad space id"); | |
2780 | |
2781 ParallelCompactData& sd = summary_data(); | |
2782 const SpaceInfo* const space_info = _space_info + id; | |
2783 ObjectStartArray* const start_array = space_info->start_array(); | |
2784 | |
2785 const MutableSpace* const space = space_info->space(); | |
2786 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2787 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2788 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2789 |
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2790 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2791 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2792 const RegionData* cur_region; |
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2793 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2794 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2795 if (addr != NULL) { |
2796 if (start_array != NULL) { | |
2797 start_array->allocate_block(addr); | |
2798 } | |
2799 oop(addr)->update_contents(cm); | |
2800 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2801 } | |
2802 } | |
2803 } | |
2804 | |
2805 // Skip over count live words starting from beg, and return the address of the | |
2806 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2807 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2808 // an object, or account for those live words in some other way. Callers must | |
2809 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2810 HeapWord* | |
2811 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2812 { | |
2813 assert(count > 0, "sanity"); | |
2814 | |
2815 ParMarkBitMap* m = mark_bitmap(); | |
2816 idx_t bits_to_skip = m->words_to_bits(count); | |
2817 idx_t cur_beg = m->addr_to_bit(beg); | |
2818 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2819 | |
2820 do { | |
2821 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2822 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2823 const size_t obj_bits = cur_end - cur_beg + 1; | |
2824 if (obj_bits > bits_to_skip) { | |
2825 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2826 } | |
2827 bits_to_skip -= obj_bits; | |
2828 cur_beg = cur_end + 1; | |
2829 } while (bits_to_skip > 0); | |
2830 | |
2831 // Skipping the desired number of words landed just past the end of an object. | |
2832 // Find the start of the next object. | |
2833 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2834 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2835 return m->bit_to_addr(cur_beg); | |
2836 } | |
2837 | |
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2838 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2839 SpaceId src_space_id, |
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2840 size_t src_region_idx) |
0 | 2841 { |
482
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2842 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2843 |
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2844 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2845 if (split_info.dest_region_addr() == dest_addr) { |
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2846 // The partial object ending at the split point contains the first word to |
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2847 // be copied to dest_addr. |
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2848 return split_info.first_src_addr(); |
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2849 } |
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2850 |
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2851 const ParallelCompactData& sd = summary_data(); |
0 | 2852 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2853 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2854 |
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2855 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2856 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2857 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2858 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2859 |
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2860 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2861 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2862 |
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2863 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2864 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2865 |
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2866 HeapWord* addr = src_region_beg; |
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2867 if (dest_addr == src_region_destination) { |
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2868 // Return the first live word in the source region. |
0 | 2869 if (partial_obj_size == 0) { |
375
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2870 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2871 assert(addr < src_region_end, "no objects start in src region"); |
0 | 2872 } |
2873 return addr; | |
2874 } | |
2875 | |
2876 // Must skip some live data. | |
375
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2877 size_t words_to_skip = dest_addr - src_region_destination; |
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2878 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 2879 |
2880 if (partial_obj_size >= words_to_skip) { | |
2881 // All the live words to skip are part of the partial object. | |
2882 addr += words_to_skip; | |
2883 if (partial_obj_size == words_to_skip) { | |
2884 // Find the first live word past the partial object. | |
375
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2885 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2886 assert(addr < src_region_end, "wrong src region"); |
0 | 2887 } |
2888 return addr; | |
2889 } | |
2890 | |
2891 // Skip over the partial object (if any). | |
2892 if (partial_obj_size != 0) { | |
2893 words_to_skip -= partial_obj_size; | |
2894 addr += partial_obj_size; | |
2895 } | |
2896 | |
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2897 // Skip over live words due to objects that start in the region. |
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2898 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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2899 assert(addr < src_region_end, "wrong src region"); |
0 | 2900 return addr; |
2901 } | |
2902 | |
2903 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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2904 SpaceId src_space_id, |
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2905 size_t beg_region, |
0 | 2906 HeapWord* end_addr) |
2907 { | |
2908 ParallelCompactData& sd = summary_data(); | |
495
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2909 |
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2910 #ifdef ASSERT |
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2911 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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2912 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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2913 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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2914 "src_space_id does not match beg_addr"); |
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2915 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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2916 "src_space_id does not match end_addr"); |
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2917 #endif // #ifdef ASSERT |
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2918 |
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2919 RegionData* const beg = sd.region(beg_region); |
495
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2920 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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2921 |
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2922 // Regions up to new_top() are enqueued if they become available. |
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2923 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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2924 RegionData* const enqueue_end = |
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2925 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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2926 |
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2927 for (RegionData* cur = beg; cur < end; ++cur) { |
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2928 assert(cur->data_size() > 0, "region must have live data"); |
0 | 2929 cur->decrement_destination_count(); |
495
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2930 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 2931 cm->push_region(sd.region(cur)); |
0 | 2932 } |
2933 } | |
2934 } | |
2935 | |
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2936 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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2937 SpaceId& src_space_id, |
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2938 HeapWord*& src_space_top, |
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2939 HeapWord* end_addr) |
0 | 2940 { |
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2941 typedef ParallelCompactData::RegionData RegionData; |
0 | 2942 |
2943 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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2944 const size_t region_size = ParallelCompactData::RegionSize; |
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2945 |
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2946 size_t src_region_idx = 0; |
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2947 |
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2948 // Skip empty regions (if any) up to the top of the space. |
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2949 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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2950 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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2951 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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2952 const RegionData* const top_region_ptr = |
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2953 sd.addr_to_region_ptr(top_aligned_up); |
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2954 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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2955 ++src_region_ptr; |
0 | 2956 } |
2957 | |
375
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2958 if (src_region_ptr < top_region_ptr) { |
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2959 // The next source region is in the current space. Update src_region_idx |
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2960 // and the source address to match src_region_ptr. |
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2961 src_region_idx = sd.region(src_region_ptr); |
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2962 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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2963 if (src_region_addr > closure.source()) { |
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2964 closure.set_source(src_region_addr); |
0 | 2965 } |
375
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2966 return src_region_idx; |
0 | 2967 } |
2968 | |
375
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2969 // Switch to a new source space and find the first non-empty region. |
0 | 2970 unsigned int space_id = src_space_id + 1; |
2971 assert(space_id < last_space_id, "not enough spaces"); | |
2972 | |
2973 HeapWord* const destination = closure.destination(); | |
2974 | |
2975 do { | |
2976 MutableSpace* space = _space_info[space_id].space(); | |
2977 HeapWord* const bottom = space->bottom(); | |
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2978 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 2979 |
2980 // Iterate over the spaces that do not compact into themselves. | |
2981 if (bottom_cp->destination() != bottom) { | |
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2982 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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2983 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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2984 |
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2985 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 2986 if (src_cp->live_obj_size() > 0) { |
2987 // Found it. | |
2988 assert(src_cp->destination() == destination, | |
2989 "first live obj in the space must match the destination"); | |
2990 assert(src_cp->partial_obj_size() == 0, | |
2991 "a space cannot begin with a partial obj"); | |
2992 | |
2993 src_space_id = SpaceId(space_id); | |
2994 src_space_top = space->top(); | |
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2995 const size_t src_region_idx = sd.region(src_cp); |
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2996 closure.set_source(sd.region_to_addr(src_region_idx)); |
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2997 return src_region_idx; |
0 | 2998 } else { |
2999 assert(src_cp->data_size() == 0, "sanity"); | |
3000 } | |
3001 } | |
3002 } | |
3003 } while (++space_id < last_space_id); | |
3004 | |
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3005 assert(false, "no source region was found"); |
0 | 3006 return 0; |
3007 } | |
3008 | |
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3009 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3010 { |
3011 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
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3012 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3013 ParMarkBitMap* const bitmap = mark_bitmap(); |
3014 ParallelCompactData& sd = summary_data(); | |
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3015 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3016 |
3017 // Get the items needed to construct the closure. | |
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3018 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3019 SpaceId dest_space_id = space_id(dest_addr); |
3020 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3021 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3022 assert(dest_addr < new_top, "sanity"); | |
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3023 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3024 |
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3025 // Get the source region and related info. |
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3026 size_t src_region_idx = region_ptr->source_region(); |
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3027 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3028 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3029 | |
3030 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3031 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
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3032 |
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3033 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3034 // destination count is not decremented when a region is copied to itself). |
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3035 if (src_region_idx == region_idx) { |
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3036 src_region_idx += 1; |
0 | 3037 } |
3038 | |
3039 if (bitmap->is_unmarked(closure.source())) { | |
3040 // The first source word is in the middle of an object; copy the remainder | |
3041 // of the object or as much as will fit. The fact that pointer updates were | |
3042 // deferred will be noted when the object header is processed. | |
3043 HeapWord* const old_src_addr = closure.source(); | |
3044 closure.copy_partial_obj(); | |
3045 if (closure.is_full()) { | |
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3046 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3047 closure.source()); |
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3048 region_ptr->set_deferred_obj_addr(NULL); |
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3049 region_ptr->set_completed(); |
0 | 3050 return; |
3051 } | |
3052 | |
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3053 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3054 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3055 // The partial object was copied from more than one source region. |
495
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3056 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3057 |
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3058 // Move to the next source region, possibly switching spaces as well. All |
0 | 3059 // args except end_addr may be modified. |
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3060 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3061 end_addr); |
0 | 3062 } |
3063 } | |
3064 | |
3065 do { | |
3066 HeapWord* const cur_addr = closure.source(); | |
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3067 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3068 src_space_top); |
3069 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3070 | |
3071 if (status == ParMarkBitMap::incomplete) { | |
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3072 // The last obj that starts in the source region does not end in the |
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3073 // region. |
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3074 assert(closure.source() < end_addr, "sanity"); |
0 | 3075 HeapWord* const obj_beg = closure.source(); |
3076 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3077 src_space_top); | |
3078 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3079 if (obj_end < range_end) { | |
3080 // The end was found; the entire object will fit. | |
3081 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3082 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3083 } else { | |
3084 // The end was not found; the object will not fit. | |
3085 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3086 status = ParMarkBitMap::would_overflow; | |
3087 } | |
3088 } | |
3089 | |
3090 if (status == ParMarkBitMap::would_overflow) { | |
3091 // The last object did not fit. Note that interior oop updates were | |
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3092 // deferred, then copy enough of the object to fill the region. |
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3093 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3094 status = closure.copy_until_full(); // copies from closure.source() |
3095 | |
495
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3096 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3097 closure.source()); |
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3098 region_ptr->set_completed(); |
0 | 3099 return; |
3100 } | |
3101 | |
3102 if (status == ParMarkBitMap::full) { | |
495
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3103 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3104 closure.source()); |
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3105 region_ptr->set_deferred_obj_addr(NULL); |
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3106 region_ptr->set_completed(); |
0 | 3107 return; |
3108 } | |
3109 | |
495
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3110 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3111 |
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3112 // Move to the next source region, possibly switching spaces as well. All |
0 | 3113 // args except end_addr may be modified. |
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3114 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3115 end_addr); |
0 | 3116 } while (true); |
3117 } | |
3118 | |
3119 void | |
3120 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3121 const MutableSpace* sp = space(space_id); | |
3122 if (sp->is_empty()) { | |
3123 return; | |
3124 } | |
3125 | |
3126 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3127 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3128 HeapWord* const dp_addr = dense_prefix(space_id); | |
3129 HeapWord* beg_addr = sp->bottom(); | |
3130 HeapWord* end_addr = sp->top(); | |
3131 | |
3132 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3133 | |
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3134 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3135 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3136 if (beg_region < dp_region) { |
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3137 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3138 } |
3139 | |
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3140 // The destination of the first live object that starts in the region is one |
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3141 // past the end of the partial object entering the region (if any). |
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3142 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3143 HeapWord* const new_top = _space_info[space_id].new_top(); |
3144 assert(new_top >= dest_addr, "bad new_top value"); | |
3145 const size_t words = pointer_delta(new_top, dest_addr); | |
3146 | |
3147 if (words > 0) { | |
3148 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3149 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3150 | |
3151 ParMarkBitMap::IterationStatus status; | |
3152 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3153 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3154 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3155 "live objects skipped because closure is full"); | |
3156 } | |
3157 } | |
3158 | |
3159 jlong PSParallelCompact::millis_since_last_gc() { | |
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3160 // We need a monotonically non-deccreasing time in ms but |
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3161 // os::javaTimeMillis() does not guarantee monotonicity. |
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3162 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3163 jlong ret_val = now - _time_of_last_gc; |
0 | 3164 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3165 if (ret_val < 0) { | |
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3166 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3167 return 0; |
3168 } | |
3169 return ret_val; | |
3170 } | |
3171 | |
3172 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3173 // We need a monotonically non-deccreasing time in ms but |
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3174 // os::javaTimeMillis() does not guarantee monotonicity. |
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3175 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3176 } |
3177 | |
3178 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3179 { | |
3180 if (source() != destination()) { | |
495
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3181 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3182 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3183 } | |
3184 update_state(words_remaining()); | |
3185 assert(is_full(), "sanity"); | |
3186 return ParMarkBitMap::full; | |
3187 } | |
3188 | |
3189 void MoveAndUpdateClosure::copy_partial_obj() | |
3190 { | |
3191 size_t words = words_remaining(); | |
3192 | |
3193 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3194 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3195 if (end_addr < range_end) { | |
3196 words = bitmap()->obj_size(source(), end_addr); | |
3197 } | |
3198 | |
3199 // This test is necessary; if omitted, the pointer updates to a partial object | |
3200 // that crosses the dense prefix boundary could be overwritten. | |
3201 if (source() != destination()) { | |
495
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3202 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3203 Copy::aligned_conjoint_words(source(), destination(), words); |
3204 } | |
3205 update_state(words); | |
3206 } | |
3207 | |
3208 ParMarkBitMapClosure::IterationStatus | |
3209 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3210 assert(destination() != NULL, "sanity"); | |
3211 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3212 | |
3213 _source = addr; | |
3214 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3215 destination(), "wrong destination"); | |
3216 | |
3217 if (words > words_remaining()) { | |
3218 return ParMarkBitMap::would_overflow; | |
3219 } | |
3220 | |
3221 // The start_array must be updated even if the object is not moving. | |
3222 if (_start_array != NULL) { | |
3223 _start_array->allocate_block(destination()); | |
3224 } | |
3225 | |
3226 if (destination() != source()) { | |
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3227 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3228 Copy::aligned_conjoint_words(source(), destination(), words); |
3229 } | |
3230 | |
3231 oop moved_oop = (oop) destination(); | |
3232 moved_oop->update_contents(compaction_manager()); | |
3233 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3234 | |
3235 update_state(words); | |
3236 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3237 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3238 } | |
3239 | |
3240 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3241 ParCompactionManager* cm, | |
3242 PSParallelCompact::SpaceId space_id) : | |
3243 ParMarkBitMapClosure(mbm, cm), | |
3244 _space_id(space_id), | |
3245 _start_array(PSParallelCompact::start_array(space_id)) | |
3246 { | |
3247 } | |
3248 | |
3249 // Updates the references in the object to their new values. | |
3250 ParMarkBitMapClosure::IterationStatus | |
3251 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3252 do_addr(addr); | |
3253 return ParMarkBitMap::incomplete; | |
3254 } |