Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 10183:868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
Reviewed-by: mgerdin, coleenp
author | jmasa |
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date | Tue, 12 Feb 2013 14:15:45 -0800 |
parents | a08c80e9e1e5 |
children | b06ac540229e |
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 |
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168 void PSParallelCompact::print_on_error(outputStream* st) { |
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169 _mark_bitmap.print_on_error(st); |
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170 } |
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171 |
0 | 172 #ifndef PRODUCT |
173 const char* PSParallelCompact::space_names[] = { | |
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174 "old ", "eden", "from", "to " |
0 | 175 }; |
176 | |
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177 void PSParallelCompact::print_region_ranges() |
0 | 178 { |
179 tty->print_cr("space bottom top end new_top"); | |
180 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
181 | |
182 for (unsigned int id = 0; id < last_space_id; ++id) { | |
183 const MutableSpace* space = _space_info[id].space(); | |
184 tty->print_cr("%u %s " | |
264
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185 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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186 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 187 id, space_names[id], |
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188 summary_data().addr_to_region_idx(space->bottom()), |
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189 summary_data().addr_to_region_idx(space->top()), |
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190 summary_data().addr_to_region_idx(space->end()), |
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191 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 192 } |
193 } | |
194 | |
195 void | |
375
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196 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 197 { |
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198 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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199 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 200 |
201 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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202 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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203 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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204 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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205 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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206 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 207 i, c->data_location(), dci, c->destination(), |
208 c->partial_obj_size(), c->live_obj_size(), | |
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209 c->data_size(), c->source_region(), c->destination_count()); |
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210 |
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211 #undef REGION_IDX_FORMAT |
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212 #undef REGION_DATA_FORMAT |
0 | 213 } |
214 | |
215 void | |
216 print_generic_summary_data(ParallelCompactData& summary_data, | |
217 HeapWord* const beg_addr, | |
218 HeapWord* const end_addr) | |
219 { | |
220 size_t total_words = 0; | |
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221 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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222 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 223 HeapWord* pdest = 0; |
224 | |
225 while (i <= last) { | |
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226 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 227 if (c->data_size() != 0 || c->destination() != pdest) { |
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228 print_generic_summary_region(i, c); |
0 | 229 total_words += c->data_size(); |
230 pdest = c->destination(); | |
231 } | |
232 ++i; | |
233 } | |
234 | |
235 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
236 } | |
237 | |
238 void | |
239 print_generic_summary_data(ParallelCompactData& summary_data, | |
240 SpaceInfo* space_info) | |
241 { | |
242 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
243 const MutableSpace* space = space_info[id].space(); | |
244 print_generic_summary_data(summary_data, space->bottom(), | |
245 MAX2(space->top(), space_info[id].new_top())); | |
246 } | |
247 } | |
248 | |
249 void | |
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250 print_initial_summary_region(size_t i, |
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251 const ParallelCompactData::RegionData* c, |
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252 bool newline = true) |
0 | 253 { |
264
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254 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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255 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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256 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 257 i, c->destination(), |
258 c->partial_obj_size(), c->live_obj_size(), | |
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259 c->data_size(), c->source_region(), c->destination_count()); |
0 | 260 if (newline) tty->cr(); |
261 } | |
262 | |
263 void | |
264 print_initial_summary_data(ParallelCompactData& summary_data, | |
265 const MutableSpace* space) { | |
266 if (space->top() == space->bottom()) { | |
267 return; | |
268 } | |
269 | |
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270 const size_t region_size = ParallelCompactData::RegionSize; |
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271 typedef ParallelCompactData::RegionData RegionData; |
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272 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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273 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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274 const RegionData* c = summary_data.region(end_region - 1); |
0 | 275 HeapWord* end_addr = c->destination() + c->data_size(); |
276 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
277 | |
375
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278 // Print (and count) the full regions at the beginning of the space. |
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279 size_t full_region_count = 0; |
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280 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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281 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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282 print_initial_summary_region(i, summary_data.region(i)); |
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283 ++full_region_count; |
0 | 284 ++i; |
285 } | |
286 | |
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287 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 288 |
289 double max_reclaimed_ratio = 0.0; | |
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290 size_t max_reclaimed_ratio_region = 0; |
0 | 291 size_t max_dead_to_right = 0; |
292 size_t max_live_to_right = 0; | |
293 | |
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294 // Print the 'reclaimed ratio' for regions while there is something live in |
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295 // the region or to the right of it. The remaining regions are empty (and |
0 | 296 // uninteresting), and computing the ratio will result in division by 0. |
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297 while (i < end_region && live_to_right > 0) { |
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298 c = summary_data.region(i); |
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299 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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300 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 301 const size_t dead_to_right = used_to_right - live_to_right; |
302 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
303 | |
304 if (reclaimed_ratio > max_reclaimed_ratio) { | |
305 max_reclaimed_ratio = reclaimed_ratio; | |
375
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306 max_reclaimed_ratio_region = i; |
0 | 307 max_dead_to_right = dead_to_right; |
308 max_live_to_right = live_to_right; | |
309 } | |
310 | |
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311 print_initial_summary_region(i, c, false); |
264
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312 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 313 reclaimed_ratio, dead_to_right, live_to_right); |
314 | |
315 live_to_right -= c->data_size(); | |
316 ++i; | |
317 } | |
318 | |
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319 // Any remaining regions are empty. Print one more if there is one. |
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320 if (i < end_region) { |
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321 print_initial_summary_region(i, summary_data.region(i)); |
0 | 322 } |
323 | |
264
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324 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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325 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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326 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 327 max_live_to_right, max_reclaimed_ratio); |
328 } | |
329 | |
330 void | |
331 print_initial_summary_data(ParallelCompactData& summary_data, | |
332 SpaceInfo* space_info) { | |
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333 unsigned int id = PSParallelCompact::old_space_id; |
0 | 334 const MutableSpace* space; |
335 do { | |
336 space = space_info[id].space(); | |
337 print_initial_summary_data(summary_data, space); | |
338 } while (++id < PSParallelCompact::eden_space_id); | |
339 | |
340 do { | |
341 space = space_info[id].space(); | |
342 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
343 } while (++id < PSParallelCompact::last_space_id); | |
344 } | |
345 #endif // #ifndef PRODUCT | |
346 | |
347 #ifdef ASSERT | |
348 size_t add_obj_count; | |
349 size_t add_obj_size; | |
350 size_t mark_bitmap_count; | |
351 size_t mark_bitmap_size; | |
352 #endif // #ifdef ASSERT | |
353 | |
354 ParallelCompactData::ParallelCompactData() | |
355 { | |
356 _region_start = 0; | |
357 | |
375
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358 _region_vspace = 0; |
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359 _region_data = 0; |
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360 _region_count = 0; |
0 | 361 } |
362 | |
363 bool ParallelCompactData::initialize(MemRegion covered_region) | |
364 { | |
365 _region_start = covered_region.start(); | |
366 const size_t region_size = covered_region.word_size(); | |
367 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
368 | |
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369 assert(region_align_down(_region_start) == _region_start, |
0 | 370 "region start not aligned"); |
375
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371 assert((region_size & RegionSizeOffsetMask) == 0, |
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372 "region size not a multiple of RegionSize"); |
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373 |
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374 bool result = initialize_region_data(region_size); |
0 | 375 |
376 return result; | |
377 } | |
378 | |
379 PSVirtualSpace* | |
380 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
381 { | |
382 const size_t raw_bytes = count * element_size; | |
383 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
384 const size_t granularity = os::vm_allocation_granularity(); | |
385 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
386 | |
387 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
388 MAX2(page_sz, granularity); | |
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389 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 390 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
391 rs.size()); | |
6197 | 392 |
393 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
394 | |
0 | 395 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
396 if (vspace != 0) { | |
397 if (vspace->expand_by(bytes)) { | |
398 return vspace; | |
399 } | |
400 delete vspace; | |
237
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401 // Release memory reserved in the space. |
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402 rs.release(); |
0 | 403 } |
404 | |
405 return 0; | |
406 } | |
407 | |
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408 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 409 { |
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410 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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411 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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412 if (_region_vspace != 0) { |
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413 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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414 _region_count = count; |
0 | 415 return true; |
416 } | |
417 return false; | |
418 } | |
419 | |
420 void ParallelCompactData::clear() | |
421 { | |
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422 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 423 } |
424 | |
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425 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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426 assert(beg_region <= _region_count, "beg_region out of range"); |
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427 assert(end_region <= _region_count, "end_region out of range"); |
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428 |
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429 const size_t region_cnt = end_region - beg_region; |
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430 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 431 } |
432 | |
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433 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 434 { |
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435 const RegionData* cur_cp = region(region_idx); |
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436 const RegionData* const end_cp = region(region_count() - 1); |
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437 |
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438 HeapWord* result = region_to_addr(region_idx); |
0 | 439 if (cur_cp < end_cp) { |
440 do { | |
441 result += cur_cp->partial_obj_size(); | |
375
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442 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 443 } |
444 return result; | |
445 } | |
446 | |
447 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
448 { | |
449 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
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450 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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451 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 452 |
453 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
454 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
455 | |
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456 if (beg_region == end_region) { |
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457 // All in one region. |
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458 _region_data[beg_region].add_live_obj(len); |
0 | 459 return; |
460 } | |
461 | |
375
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462 // First region. |
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463 const size_t beg_ofs = region_offset(addr); |
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464 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 465 |
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466 Klass* klass = ((oop)addr)->klass(); |
375
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467 // Middle regions--completely spanned by this object. |
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468 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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469 _region_data[region].set_partial_obj_size(RegionSize); |
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470 _region_data[region].set_partial_obj_addr(addr); |
0 | 471 } |
472 | |
375
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473 // Last region. |
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474 const size_t end_ofs = region_offset(addr + len - 1); |
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475 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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476 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 477 } |
478 | |
479 void | |
480 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
481 { | |
375
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482 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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483 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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484 |
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485 size_t cur_region = addr_to_region_idx(beg); |
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486 const size_t end_region = addr_to_region_idx(end); |
0 | 487 HeapWord* addr = beg; |
375
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488 while (cur_region < end_region) { |
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489 _region_data[cur_region].set_destination(addr); |
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490 _region_data[cur_region].set_destination_count(0); |
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491 _region_data[cur_region].set_source_region(cur_region); |
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492 _region_data[cur_region].set_data_location(addr); |
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493 |
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494 // Update live_obj_size so the region appears completely full. |
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495 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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496 _region_data[cur_region].set_live_obj_size(live_size); |
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497 |
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498 ++cur_region; |
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499 addr += RegionSize; |
0 | 500 } |
501 } | |
502 | |
482
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503 // Find the point at which a space can be split and, if necessary, record the |
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504 // split point. |
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505 // |
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506 // If the current src region (which overflowed the destination space) doesn't |
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507 // have a partial object, the split point is at the beginning of the current src |
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508 // region (an "easy" split, no extra bookkeeping required). |
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509 // |
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510 // If the current src region has a partial object, the split point is in the |
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511 // region where that partial object starts (call it the split_region). If |
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512 // split_region has a partial object, then the split point is just after that |
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513 // partial object (a "hard" split where we have to record the split data and |
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514 // zero the partial_obj_size field). With a "hard" split, we know that the |
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515 // partial_obj ends within split_region because the partial object that caused |
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516 // the overflow starts in split_region. If split_region doesn't have a partial |
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517 // obj, then the split is at the beginning of split_region (another "easy" |
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518 // split). |
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519 HeapWord* |
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520 ParallelCompactData::summarize_split_space(size_t src_region, |
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521 SplitInfo& split_info, |
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522 HeapWord* destination, |
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523 HeapWord* target_end, |
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524 HeapWord** target_next) |
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525 { |
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526 assert(destination <= target_end, "sanity"); |
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527 assert(destination + _region_data[src_region].data_size() > target_end, |
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528 "region should not fit into target space"); |
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529 assert(is_region_aligned(target_end), "sanity"); |
482
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530 |
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531 size_t split_region = src_region; |
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532 HeapWord* split_destination = destination; |
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533 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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534 |
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535 if (destination + partial_obj_size > target_end) { |
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536 // The split point is just after the partial object (if any) in the |
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537 // src_region that contains the start of the object that overflowed the |
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538 // destination space. |
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539 // |
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540 // Find the start of the "overflow" object and set split_region to the |
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541 // region containing it. |
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542 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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543 split_region = addr_to_region_idx(overflow_obj); |
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544 |
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545 // Clear the source_region field of all destination regions whose first word |
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546 // came from data after the split point (a non-null source_region field |
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547 // implies a region must be filled). |
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548 // |
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549 // An alternative to the simple loop below: clear during post_compact(), |
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550 // which uses memcpy instead of individual stores, and is easy to |
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551 // parallelize. (The downside is that it clears the entire RegionData |
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552 // object as opposed to just one field.) |
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553 // |
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554 // post_compact() would have to clear the summary data up to the highest |
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555 // address that was written during the summary phase, which would be |
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556 // |
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557 // max(top, max(new_top, clear_top)) |
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558 // |
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559 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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560 // to target_end. |
482
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561 const RegionData* const sr = region(split_region); |
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562 const size_t beg_idx = |
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563 addr_to_region_idx(region_align_up(sr->destination() + |
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564 sr->partial_obj_size())); |
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565 const size_t end_idx = addr_to_region_idx(target_end); |
482
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566 |
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567 if (TraceParallelOldGCSummaryPhase) { |
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568 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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569 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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570 beg_idx, end_idx); |
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571 } |
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572 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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573 _region_data[idx].set_source_region(0); |
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574 } |
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575 |
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576 // Set split_destination and partial_obj_size to reflect the split region. |
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577 split_destination = sr->destination(); |
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578 partial_obj_size = sr->partial_obj_size(); |
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579 } |
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580 |
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581 // The split is recorded only if a partial object extends onto the region. |
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582 if (partial_obj_size != 0) { |
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583 _region_data[split_region].set_partial_obj_size(0); |
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584 split_info.record(split_region, partial_obj_size, split_destination); |
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585 } |
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586 |
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587 // Setup the continuation addresses. |
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588 *target_next = split_destination + partial_obj_size; |
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589 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 590 |
591 if (TraceParallelOldGCSummaryPhase) { | |
482
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592 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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593 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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594 " pos=" SIZE_FORMAT, |
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595 split_type, source_next, split_region, |
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|
596 partial_obj_size); |
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597 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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598 " tn=" PTR_FORMAT, |
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599 split_type, split_destination, |
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600 addr_to_region_idx(split_destination), |
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601 *target_next); |
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602 |
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603 if (partial_obj_size != 0) { |
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604 HeapWord* const po_beg = split_info.destination(); |
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605 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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606 gclog_or_tty->print_cr("%s split: " |
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607 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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608 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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609 split_type, |
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610 po_beg, addr_to_region_idx(po_beg), |
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611 po_end, addr_to_region_idx(po_end)); |
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612 } |
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613 } |
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614 |
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615 return source_next; |
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616 } |
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617 |
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618 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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619 HeapWord* source_beg, HeapWord* source_end, |
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620 HeapWord** source_next, |
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621 HeapWord* target_beg, HeapWord* target_end, |
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622 HeapWord** target_next) |
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623 { |
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624 if (TraceParallelOldGCSummaryPhase) { |
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625 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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626 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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627 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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628 source_beg, source_end, source_next_val, |
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629 target_beg, target_end, *target_next); |
0 | 630 } |
631 | |
375
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632 size_t cur_region = addr_to_region_idx(source_beg); |
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633 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 634 |
635 HeapWord *dest_addr = target_beg; | |
375
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636 while (cur_region < end_region) { |
482
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637 // The destination must be set even if the region has no data. |
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638 _region_data[cur_region].set_destination(dest_addr); |
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639 |
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640 size_t words = _region_data[cur_region].data_size(); |
0 | 641 if (words > 0) { |
482
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642 // If cur_region does not fit entirely into the target space, find a point |
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643 // at which the source space can be 'split' so that part is copied to the |
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644 // target space and the rest is copied elsewhere. |
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645 if (dest_addr + words > target_end) { |
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646 assert(source_next != NULL, "source_next is NULL when splitting"); |
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647 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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648 target_end, target_next); |
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649 return false; |
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650 } |
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651 |
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652 // Compute the destination_count for cur_region, and if necessary, update |
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653 // source_region for a destination region. The source_region field is |
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654 // updated if cur_region is the first (left-most) region to be copied to a |
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655 // destination region. |
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656 // |
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657 // The destination_count calculation is a bit subtle. A region that has |
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658 // data that compacts into itself does not count itself as a destination. |
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659 // This maintains the invariant that a zero count means the region is |
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660 // available and can be claimed and then filled. |
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661 uint destination_count = 0; |
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662 if (split_info.is_split(cur_region)) { |
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663 // The current region has been split: the partial object will be copied |
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664 // to one destination space and the remaining data will be copied to |
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665 // another destination space. Adjust the initial destination_count and, |
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666 // if necessary, set the source_region field if the partial object will |
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667 // cross a destination region boundary. |
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668 destination_count = split_info.destination_count(); |
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669 if (destination_count == 2) { |
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670 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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671 _region_data[dest_idx].set_source_region(cur_region); |
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672 } |
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673 } |
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674 |
0 | 675 HeapWord* const last_addr = dest_addr + words - 1; |
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676 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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677 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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678 |
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679 // Initially assume that the destination regions will be the same and |
0 | 680 // adjust the value below if necessary. Under this assumption, if |
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681 // cur_region == dest_region_2, then cur_region will be compacted |
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682 // completely into itself. |
482
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683 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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684 if (dest_region_1 != dest_region_2) { |
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685 // Destination regions differ; adjust destination_count. |
0 | 686 destination_count += 1; |
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687 // Data from cur_region will be copied to the start of dest_region_2. |
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688 _region_data[dest_region_2].set_source_region(cur_region); |
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689 } else if (region_offset(dest_addr) == 0) { |
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690 // Data from cur_region will be copied to the start of the destination |
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691 // region. |
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692 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 693 } |
694 | |
375
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695 _region_data[cur_region].set_destination_count(destination_count); |
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696 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 697 dest_addr += words; |
698 } | |
699 | |
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700 ++cur_region; |
0 | 701 } |
702 | |
703 *target_next = dest_addr; | |
704 return true; | |
705 } | |
706 | |
707 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
708 assert(addr != NULL, "Should detect NULL oop earlier"); | |
709 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
710 #ifdef ASSERT | |
711 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
712 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
713 } | |
714 #endif | |
715 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
716 | |
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717 // Region covering the object. |
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718 size_t region_index = addr_to_region_idx(addr); |
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719 const RegionData* const region_ptr = region(region_index); |
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720 HeapWord* const region_addr = region_align_down(addr); |
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721 |
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722 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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723 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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724 |
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725 HeapWord* result = region_ptr->destination(); |
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726 |
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727 // If all the data in the region is live, then the new location of the object |
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728 // can be calculated from the destination of the region plus the offset of the |
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729 // object in the region. |
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730 if (region_ptr->data_size() == RegionSize) { |
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731 result += pointer_delta(addr, region_addr); |
1571
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732 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 733 return result; |
734 } | |
735 | |
736 // The new location of the object is | |
375
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737 // region destination + |
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738 // size of the partial object extending onto the region + |
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739 // sizes of the live objects in the Region that are to the left of addr |
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740 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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741 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 742 |
743 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
744 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
745 | |
746 result += partial_obj_size + live_to_left; | |
495
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747 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 748 return result; |
749 } | |
750 | |
751 #ifdef ASSERT | |
752 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
753 { | |
754 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
755 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
756 for (const size_t* p = beg; p < end; ++p) { | |
757 assert(*p == 0, "not zero"); | |
758 } | |
759 } | |
760 | |
761 void ParallelCompactData::verify_clear() | |
762 { | |
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763 verify_clear(_region_vspace); |
0 | 764 } |
765 #endif // #ifdef ASSERT | |
766 | |
767 #ifdef NOT_PRODUCT | |
375
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768 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 769 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
375
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770 return sd.region(region_index); |
0 | 771 } |
772 #endif | |
773 | |
774 elapsedTimer PSParallelCompact::_accumulated_time; | |
775 unsigned int PSParallelCompact::_total_invocations = 0; | |
776 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
777 jlong PSParallelCompact::_time_of_last_gc = 0; | |
778 CollectorCounters* PSParallelCompact::_counters = NULL; | |
779 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
780 ParallelCompactData PSParallelCompact::_summary_data; | |
781 | |
782 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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783 |
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784 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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785 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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786 |
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787 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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788 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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789 |
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790 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure; |
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791 PSParallelCompact::AdjustKlassClosure PSParallelCompact::_adjust_klass_closure; |
0 | 792 |
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793 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); } |
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794 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); } |
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795 |
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796 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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797 |
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798 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { |
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799 mark_and_push(_compaction_manager, p); |
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800 } |
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801 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 802 |
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803 void PSParallelCompact::FollowKlassClosure::do_klass(Klass* klass) { |
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804 klass->oops_do(_mark_and_push_closure); |
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805 } |
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806 void PSParallelCompact::AdjustKlassClosure::do_klass(Klass* klass) { |
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807 klass->oops_do(&PSParallelCompact::_adjust_pointer_closure); |
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808 } |
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809 |
0 | 810 void PSParallelCompact::post_initialize() { |
811 ParallelScavengeHeap* heap = gc_heap(); | |
812 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
813 | |
814 MemRegion mr = heap->reserved_region(); | |
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815 _ref_processor = |
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816 new ReferenceProcessor(mr, // span |
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817 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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818 (int) ParallelGCThreads, // mt processing degree |
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819 true, // mt discovery |
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820 (int) ParallelGCThreads, // mt discovery degree |
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821 true, // atomic_discovery |
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822 &_is_alive_closure, // non-header is alive closure |
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823 false); // write barrier for next field updates |
0 | 824 _counters = new CollectorCounters("PSParallelCompact", 1); |
825 | |
826 // Initialize static fields in ParCompactionManager. | |
827 ParCompactionManager::initialize(mark_bitmap()); | |
828 } | |
829 | |
830 bool PSParallelCompact::initialize() { | |
831 ParallelScavengeHeap* heap = gc_heap(); | |
832 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
833 MemRegion mr = heap->reserved_region(); | |
834 | |
835 // Was the old gen get allocated successfully? | |
836 if (!heap->old_gen()->is_allocated()) { | |
837 return false; | |
838 } | |
839 | |
840 initialize_space_info(); | |
841 initialize_dead_wood_limiter(); | |
842 | |
843 if (!_mark_bitmap.initialize(mr)) { | |
844 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
845 "parallel garbage collection for the requested heap size."); | |
846 return false; | |
847 } | |
848 | |
849 if (!_summary_data.initialize(mr)) { | |
850 vm_shutdown_during_initialization("Unable to allocate tables for " | |
851 "parallel garbage collection for the requested heap size."); | |
852 return false; | |
853 } | |
854 | |
855 return true; | |
856 } | |
857 | |
858 void PSParallelCompact::initialize_space_info() | |
859 { | |
860 memset(&_space_info, 0, sizeof(_space_info)); | |
861 | |
862 ParallelScavengeHeap* heap = gc_heap(); | |
863 PSYoungGen* young_gen = heap->young_gen(); | |
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864 |
0 | 865 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
866 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
867 _space_info[from_space_id].set_space(young_gen->from_space()); | |
868 _space_info[to_space_id].set_space(young_gen->to_space()); | |
869 | |
870 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
871 } | |
872 | |
873 void PSParallelCompact::initialize_dead_wood_limiter() | |
874 { | |
875 const size_t max = 100; | |
876 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
877 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
878 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
879 DEBUG_ONLY(_dwl_initialized = true;) | |
880 _dwl_adjustment = normal_distribution(1.0); | |
881 } | |
882 | |
883 // Simple class for storing info about the heap at the start of GC, to be used | |
884 // after GC for comparison/printing. | |
885 class PreGCValues { | |
886 public: | |
887 PreGCValues() { } | |
888 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
889 | |
890 void fill(ParallelScavengeHeap* heap) { | |
891 _heap_used = heap->used(); | |
892 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
893 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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894 _metadata_used = MetaspaceAux::allocated_used_bytes(); |
0 | 895 }; |
896 | |
897 size_t heap_used() const { return _heap_used; } | |
898 size_t young_gen_used() const { return _young_gen_used; } | |
899 size_t old_gen_used() const { return _old_gen_used; } | |
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900 size_t metadata_used() const { return _metadata_used; } |
0 | 901 |
902 private: | |
903 size_t _heap_used; | |
904 size_t _young_gen_used; | |
905 size_t _old_gen_used; | |
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906 size_t _metadata_used; |
0 | 907 }; |
908 | |
909 void | |
910 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
911 { | |
912 // At this point, top is the value before GC, new_top() is the value that will | |
913 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
914 // should be marked above top. The summary data is cleared to the larger of | |
915 // top & new_top. | |
916 MutableSpace* const space = _space_info[id].space(); | |
917 HeapWord* const bot = space->bottom(); | |
918 HeapWord* const top = space->top(); | |
919 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
920 | |
921 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
922 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
923 _mark_bitmap.clear_range(beg_bit, end_bit); | |
924 | |
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925 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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926 const size_t end_region = |
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927 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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928 _summary_data.clear_range(beg_region, end_region); |
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929 |
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930 // Clear the data used to 'split' regions. |
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931 SplitInfo& split_info = _space_info[id].split_info(); |
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932 if (split_info.is_valid()) { |
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933 split_info.clear(); |
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934 } |
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935 DEBUG_ONLY(split_info.verify_clear();) |
0 | 936 } |
937 | |
938 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
939 { | |
940 // Update the from & to space pointers in space_info, since they are swapped | |
941 // at each young gen gc. Do the update unconditionally (even though a | |
942 // promotion failure does not swap spaces) because an unknown number of minor | |
943 // collections will have swapped the spaces an unknown number of times. | |
944 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
945 ParallelScavengeHeap* heap = gc_heap(); | |
946 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
947 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
948 | |
949 pre_gc_values->fill(heap); | |
950 | |
951 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
952 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
953 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
954 | |
955 // Increment the invocation count | |
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956 heap->increment_total_collections(true); |
0 | 957 |
958 // We need to track unique mark sweep invocations as well. | |
959 _total_invocations++; | |
960 | |
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961 heap->print_heap_before_gc(); |
0 | 962 |
963 // Fill in TLABs | |
964 heap->accumulate_statistics_all_tlabs(); | |
965 heap->ensure_parsability(true); // retire TLABs | |
966 | |
967 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
968 HandleMark hm; // Discard invalid handles created during verification | |
969 gclog_or_tty->print(" VerifyBeforeGC:"); | |
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970 Universe::verify(); |
0 | 971 } |
972 | |
973 // Verify object start arrays | |
974 if (VerifyObjectStartArray && | |
975 VerifyBeforeGC) { | |
976 heap->old_gen()->verify_object_start_array(); | |
977 } | |
978 | |
979 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
980 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 981 |
982 // Have worker threads release resources the next time they run a task. | |
983 gc_task_manager()->release_all_resources(); | |
0 | 984 } |
985 | |
986 void PSParallelCompact::post_compact() | |
987 { | |
988 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
989 | |
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990 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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991 // Clear the marking bitmap, summary data and split info. |
0 | 992 clear_data_covering_space(SpaceId(id)); |
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993 // Update top(). Must be done after clearing the bitmap and summary data. |
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994 _space_info[id].publish_new_top(); |
0 | 995 } |
996 | |
997 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
998 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
999 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1000 | |
1001 ParallelScavengeHeap* heap = gc_heap(); | |
1002 bool eden_empty = eden_space->is_empty(); | |
1003 if (!eden_empty) { | |
1004 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1005 heap->young_gen(), heap->old_gen()); | |
1006 } | |
1007 | |
1008 // Update heap occupancy information which is used as input to the soft ref | |
1009 // clearing policy at the next gc. | |
1010 Universe::update_heap_info_at_gc(); | |
1011 | |
1012 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1013 to_space->is_empty(); | |
1014 | |
1015 BarrierSet* bs = heap->barrier_set(); | |
1016 if (bs->is_a(BarrierSet::ModRef)) { | |
1017 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1018 MemRegion old_mr = heap->old_gen()->reserved(); | |
1019 | |
1020 if (young_gen_empty) { | |
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1021 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1022 } else { |
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1023 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1024 } |
1025 } | |
1026 | |
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1027 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1028 ClassLoaderDataGraph::purge(); |
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1029 MetaspaceAux::verify_metrics(); |
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1030 |
0 | 1031 Threads::gc_epilogue(); |
1032 CodeCache::gc_epilogue(); | |
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1033 JvmtiExport::gc_epilogue(); |
0 | 1034 |
1035 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1036 | |
1037 ref_processor()->enqueue_discovered_references(NULL); | |
1038 | |
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1039 if (ZapUnusedHeapArea) { |
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1040 heap->gen_mangle_unused_area(); |
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1041 } |
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1042 |
0 | 1043 // Update time of last GC |
1044 reset_millis_since_last_gc(); | |
1045 } | |
1046 | |
1047 HeapWord* | |
1048 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1049 bool maximum_compaction) | |
1050 { | |
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1051 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1052 const ParallelCompactData& sd = summary_data(); |
1053 | |
1054 const MutableSpace* const space = _space_info[id].space(); | |
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1055 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1056 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1057 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1058 |
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1059 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1060 // of the dense prefix. |
1061 size_t full_count = 0; | |
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1062 const RegionData* cp; |
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1063 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1064 ++full_count; |
1065 } | |
1066 | |
1067 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1068 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1069 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1070 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1071 _maximum_compaction_gc_num = total_invocations(); | |
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1072 return sd.region_to_addr(cp); |
0 | 1073 } |
1074 | |
1075 HeapWord* const new_top = _space_info[id].new_top(); | |
1076 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1077 const size_t space_used = space->used_in_words(); | |
1078 const size_t space_capacity = space->capacity_in_words(); | |
1079 | |
1080 const double cur_density = double(space_live) / space_capacity; | |
1081 const double deadwood_density = | |
1082 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1083 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1084 | |
1085 if (TraceParallelOldGCDensePrefix) { | |
1086 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1087 cur_density, deadwood_density, deadwood_goal); | |
1088 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1089 "space_cap=" SIZE_FORMAT, | |
1090 space_live, space_used, | |
1091 space_capacity); | |
1092 } | |
1093 | |
1094 // XXX - Use binary search? | |
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1095 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1096 const RegionData* full_cp = cp; |
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1097 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1098 while (cp < end_cp) { |
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1099 HeapWord* region_destination = cp->destination(); |
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1100 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1101 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1102 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1103 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1104 sd.region(cp), region_destination, |
0 | 1105 dense_prefix, cur_deadwood); |
1106 } | |
1107 | |
1108 if (cur_deadwood >= deadwood_goal) { | |
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1109 // Found the region that has the correct amount of deadwood to the left. |
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1110 // This typically occurs after crossing a fairly sparse set of regions, so |
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1111 // iterate backwards over those sparse regions, looking for the region |
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1112 // that has the lowest density of live objects 'to the right.' |
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1113 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1114 size_t live_to_left = space_to_left - cur_deadwood; |
1115 size_t space_to_right = space_capacity - space_to_left; | |
1116 size_t live_to_right = space_live - live_to_left; | |
1117 double density_to_right = double(live_to_right) / space_to_right; | |
1118 while (cp > full_cp) { | |
1119 --cp; | |
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1120 const size_t prev_region_live_to_right = live_to_right - |
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1121 cp->data_size(); |
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1122 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1123 double prev_region_density_to_right = |
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1124 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1125 if (density_to_right <= prev_region_density_to_right) { |
0 | 1126 return dense_prefix; |
1127 } | |
1128 if (TraceParallelOldGCDensePrefix && Verbose) { | |
264
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1129 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1130 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1131 prev_region_density_to_right); |
0 | 1132 } |
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1133 dense_prefix -= region_size; |
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1134 live_to_right = prev_region_live_to_right; |
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1135 space_to_right = prev_region_space_to_right; |
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1136 density_to_right = prev_region_density_to_right; |
0 | 1137 } |
1138 return dense_prefix; | |
1139 } | |
1140 | |
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1141 dense_prefix += region_size; |
0 | 1142 ++cp; |
1143 } | |
1144 | |
1145 return dense_prefix; | |
1146 } | |
1147 | |
1148 #ifndef PRODUCT | |
1149 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1150 const SpaceId id, | |
1151 const bool maximum_compaction, | |
1152 HeapWord* const addr) | |
1153 { | |
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1154 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1155 RegionData* const cp = summary_data().region(region_idx); |
0 | 1156 const MutableSpace* const space = _space_info[id].space(); |
1157 HeapWord* const new_top = _space_info[id].new_top(); | |
1158 | |
1159 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1160 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1161 const size_t space_cap = space->capacity_in_words(); | |
1162 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1163 const size_t live_to_right = new_top - cp->destination(); | |
1164 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1165 | |
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1166 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1167 "spl=" SIZE_FORMAT " " |
1168 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1169 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1170 " ratio=%10.8f", | |
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1171 algorithm, addr, region_idx, |
0 | 1172 space_live, |
1173 dead_to_left, dead_to_left_pct, | |
1174 dead_to_right, live_to_right, | |
1175 double(dead_to_right) / live_to_right); | |
1176 } | |
1177 #endif // #ifndef PRODUCT | |
1178 | |
1179 // Return a fraction indicating how much of the generation can be treated as | |
1180 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1181 // based on the density of live objects in the generation to determine a limit, | |
1182 // which is then adjusted so the return value is min_percent when the density is | |
1183 // 1. | |
1184 // | |
1185 // The following table shows some return values for a different values of the | |
1186 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1187 // min_percent is 1. | |
1188 // | |
1189 // fraction allowed as dead wood | |
1190 // ----------------------------------------------------------------- | |
1191 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1192 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1193 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1194 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1195 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1196 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1197 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1198 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1199 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1200 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1201 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1202 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1203 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1204 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1205 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1206 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1207 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1208 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1209 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1210 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1211 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1212 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1213 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1214 | |
1215 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1216 { | |
1217 assert(_dwl_initialized, "uninitialized"); | |
1218 | |
1219 // The raw limit is the value of the normal distribution at x = density. | |
1220 const double raw_limit = normal_distribution(density); | |
1221 | |
1222 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1223 // | |
1224 // First subtract the adjustment value (which is simply the precomputed value | |
1225 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1226 // Then add the minimum value, so the minimum is returned when the density is | |
1227 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1228 const double min = double(min_percent) / 100.0; | |
1229 const double limit = raw_limit - _dwl_adjustment + min; | |
1230 return MAX2(limit, 0.0); | |
1231 } | |
1232 | |
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1233 ParallelCompactData::RegionData* |
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1234 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1235 const RegionData* end) |
0 | 1236 { |
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1237 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1238 ParallelCompactData& sd = summary_data(); |
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1239 size_t left = sd.region(beg); |
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1240 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1241 |
1242 // Binary search. | |
1243 while (left < right) { | |
1244 // Equivalent to (left + right) / 2, but does not overflow. | |
1245 const size_t middle = left + (right - left) / 2; | |
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1246 RegionData* const middle_ptr = sd.region(middle); |
0 | 1247 HeapWord* const dest = middle_ptr->destination(); |
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1248 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1249 assert(dest != NULL, "sanity"); |
1250 assert(dest <= addr, "must move left"); | |
1251 | |
1252 if (middle > left && dest < addr) { | |
1253 right = middle - 1; | |
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1254 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1255 left = middle + 1; |
1256 } else { | |
1257 return middle_ptr; | |
1258 } | |
1259 } | |
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1260 return sd.region(left); |
0 | 1261 } |
1262 | |
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1263 ParallelCompactData::RegionData* |
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1264 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1265 const RegionData* end, |
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1266 size_t dead_words) |
0 | 1267 { |
1268 ParallelCompactData& sd = summary_data(); | |
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1269 size_t left = sd.region(beg); |
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1270 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1271 |
1272 // Binary search. | |
1273 while (left < right) { | |
1274 // Equivalent to (left + right) / 2, but does not overflow. | |
1275 const size_t middle = left + (right - left) / 2; | |
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1276 RegionData* const middle_ptr = sd.region(middle); |
0 | 1277 HeapWord* const dest = middle_ptr->destination(); |
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1278 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1279 assert(dest != NULL, "sanity"); |
1280 assert(dest <= addr, "must move left"); | |
1281 | |
1282 const size_t dead_to_left = pointer_delta(addr, dest); | |
1283 if (middle > left && dead_to_left > dead_words) { | |
1284 right = middle - 1; | |
1285 } else if (middle < right && dead_to_left < dead_words) { | |
1286 left = middle + 1; | |
1287 } else { | |
1288 return middle_ptr; | |
1289 } | |
1290 } | |
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1291 return sd.region(left); |
0 | 1292 } |
1293 | |
1294 // The result is valid during the summary phase, after the initial summarization | |
1295 // of each space into itself, and before final summarization. | |
1296 inline double | |
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1297 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1298 HeapWord* const bottom, |
1299 HeapWord* const top, | |
1300 HeapWord* const new_top) | |
1301 { | |
1302 ParallelCompactData& sd = summary_data(); | |
1303 | |
1304 assert(cp != NULL, "sanity"); | |
1305 assert(bottom != NULL, "sanity"); | |
1306 assert(top != NULL, "sanity"); | |
1307 assert(new_top != NULL, "sanity"); | |
1308 assert(top >= new_top, "summary data problem?"); | |
1309 assert(new_top > bottom, "space is empty; should not be here"); | |
1310 assert(new_top >= cp->destination(), "sanity"); | |
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1311 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1312 |
1313 HeapWord* const destination = cp->destination(); | |
1314 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1315 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1316 const size_t compacted_region_used = pointer_delta(top, |
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1317 sd.region_to_addr(cp)); |
0 | 1318 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1319 | |
1320 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1321 return double(reclaimable) / divisor; | |
1322 } | |
1323 | |
1324 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1325 // compacted region. The address is always on a region boundary. |
0 | 1326 // |
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1327 // Completely full regions at the left are skipped, since no compaction can |
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1328 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1329 // computed, based on the density (amount live / capacity) of the generation; |
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1330 // the region with approximately that amount of dead space to the left is |
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1331 // identified as the limit region. Regions between the last completely full |
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1332 // region and the limit region are scanned and the one that has the best |
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1333 // (maximum) reclaimed_ratio() is selected. |
0 | 1334 HeapWord* |
1335 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1336 bool maximum_compaction) | |
1337 { | |
483
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1338 if (ParallelOldGCSplitALot) { |
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1339 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1340 // The value was chosen to provoke splitting a young gen space; use it. |
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1341 return _space_info[id].dense_prefix(); |
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1342 } |
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1343 } |
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1344 |
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1345 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1346 const ParallelCompactData& sd = summary_data(); |
1347 | |
1348 const MutableSpace* const space = _space_info[id].space(); | |
1349 HeapWord* const top = space->top(); | |
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1350 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1351 HeapWord* const new_top = _space_info[id].new_top(); |
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1352 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1353 HeapWord* const bottom = space->bottom(); |
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1354 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1355 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1356 const RegionData* const new_top_cp = |
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1357 sd.addr_to_region_ptr(new_top_aligned_up); |
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1358 |
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1359 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1360 // of the dense prefix. |
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1361 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1362 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1363 space->is_empty(), "no dead space allowed to the left"); |
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1364 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1365 "region must have dead space"); |
0 | 1366 |
1367 // The gc number is saved whenever a maximum compaction is done, and used to | |
1368 // determine when the maximum compaction interval has expired. This avoids | |
1369 // successive max compactions for different reasons. | |
1370 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1371 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1372 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1373 total_invocations() == HeapFirstMaximumCompactionCount; | |
1374 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1375 _maximum_compaction_gc_num = total_invocations(); | |
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1376 return sd.region_to_addr(full_cp); |
0 | 1377 } |
1378 | |
1379 const size_t space_live = pointer_delta(new_top, bottom); | |
1380 const size_t space_used = space->used_in_words(); | |
1381 const size_t space_capacity = space->capacity_in_words(); | |
1382 | |
1383 const double density = double(space_live) / double(space_capacity); | |
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1384 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1385 const double limiter = dead_wood_limiter(density, min_percent_free); |
1386 const size_t dead_wood_max = space_used - space_live; | |
1387 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1388 dead_wood_max); | |
1389 | |
1390 if (TraceParallelOldGCDensePrefix) { | |
1391 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1392 "space_cap=" SIZE_FORMAT, | |
1393 space_live, space_used, | |
1394 space_capacity); | |
1395 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1396 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1397 density, min_percent_free, limiter, | |
1398 dead_wood_max, dead_wood_limit); | |
1399 } | |
1400 | |
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1401 // Locate the region with the desired amount of dead space to the left. |
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1402 const RegionData* const limit_cp = |
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1403 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1404 |
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1405 // Scan from the first region with dead space to the limit region and find the |
0 | 1406 // one with the best (largest) reclaimed ratio. |
1407 double best_ratio = 0.0; | |
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1408 const RegionData* best_cp = full_cp; |
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1409 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1410 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1411 if (tmp_ratio > best_ratio) { | |
1412 best_cp = cp; | |
1413 best_ratio = tmp_ratio; | |
1414 } | |
1415 } | |
1416 | |
1417 #if 0 | |
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1418 // Something to consider: if the region with the best ratio is 'close to' the |
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1419 // first region w/free space, choose the first region with free space |
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1420 // ("first-free"). The first-free region is usually near the start of the |
0 | 1421 // heap, which means we are copying most of the heap already, so copy a bit |
1422 // more to get complete compaction. | |
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1423 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1424 _maximum_compaction_gc_num = total_invocations(); |
1425 best_cp = full_cp; | |
1426 } | |
1427 #endif // #if 0 | |
1428 | |
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1429 return sd.region_to_addr(best_cp); |
0 | 1430 } |
1431 | |
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1432 #ifndef PRODUCT |
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1433 void |
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1434 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1435 size_t words) |
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1436 { |
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1437 if (TraceParallelOldGCSummaryPhase) { |
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1438 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1439 SIZE_FORMAT, start, start + words, words); |
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1440 } |
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1441 |
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1442 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1443 CollectedHeap::fill_with_objects(start, words); |
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1444 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1445 _mark_bitmap.mark_obj(p, words); |
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1446 _summary_data.add_obj(p, words); |
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1447 start_array->allocate_block(p); |
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1448 } |
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1449 } |
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1450 |
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1451 void |
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1452 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1453 { |
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1454 ParallelCompactData& sd = summary_data(); |
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1455 MutableSpace* space = _space_info[id].space(); |
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1456 |
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1457 // Find the source and destination start addresses. |
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1458 HeapWord* const src_addr = sd.region_align_down(start); |
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1459 HeapWord* dst_addr; |
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1460 if (src_addr < start) { |
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1461 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1462 } else if (src_addr > space->bottom()) { |
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1463 // The start (the original top() value) is aligned to a region boundary so |
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1464 // the associated region does not have a destination. Compute the |
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1465 // destination from the previous region. |
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1466 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1467 dst_addr = cp->destination() + cp->data_size(); |
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1468 } else { |
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1469 // Filling the entire space. |
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1470 dst_addr = space->bottom(); |
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1471 } |
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1472 assert(dst_addr != NULL, "sanity"); |
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1473 |
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1474 // Update the summary data. |
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1475 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1476 src_addr, space->top(), NULL, |
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1477 dst_addr, space->end(), |
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1478 _space_info[id].new_top_addr()); |
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1479 assert(result, "should not fail: bad filler object size"); |
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1480 } |
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1481 |
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1482 void |
496
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1483 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1484 { |
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1485 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1486 return; |
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1487 } |
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1488 |
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1489 MutableSpace* const space = _space_info[id].space(); |
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1490 if (space->is_empty()) { |
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1491 HeapWord* b = space->bottom(); |
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1492 HeapWord* t = b + space->capacity_in_words() / 2; |
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1493 space->set_top(t); |
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1494 if (ZapUnusedHeapArea) { |
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1495 space->set_top_for_allocations(); |
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1496 } |
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1497 |
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1498 size_t min_size = CollectedHeap::min_fill_size(); |
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1499 size_t obj_len = min_size; |
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1500 while (b + obj_len <= t) { |
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1501 CollectedHeap::fill_with_object(b, obj_len); |
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1502 mark_bitmap()->mark_obj(b, obj_len); |
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1503 summary_data().add_obj(b, obj_len); |
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1504 b += obj_len; |
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1505 obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ... |
496
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1506 } |
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1507 if (b < t) { |
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1508 // The loop didn't completely fill to t (top); adjust top downward. |
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1509 space->set_top(b); |
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1510 if (ZapUnusedHeapArea) { |
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1511 space->set_top_for_allocations(); |
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1512 } |
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1513 } |
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1514 |
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1515 HeapWord** nta = _space_info[id].new_top_addr(); |
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1516 bool result = summary_data().summarize(_space_info[id].split_info(), |
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1517 space->bottom(), space->top(), NULL, |
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1518 space->bottom(), space->end(), nta); |
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1519 assert(result, "space must fit into itself"); |
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1520 } |
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1521 } |
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1522 |
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1523 void |
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1524 PSParallelCompact::provoke_split(bool & max_compaction) |
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1525 { |
496
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1526 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
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1527 return; |
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1528 } |
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1529 |
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1530 const size_t region_size = ParallelCompactData::RegionSize; |
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1531 ParallelCompactData& sd = summary_data(); |
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1532 |
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1533 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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1534 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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1535 const size_t eden_live = pointer_delta(eden_space->top(), |
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1536 _space_info[eden_space_id].new_top()); |
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1537 const size_t from_live = pointer_delta(from_space->top(), |
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1538 _space_info[from_space_id].new_top()); |
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1539 |
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1540 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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1541 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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1542 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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1543 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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1544 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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1545 |
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1546 // Choose the space to split; need at least 2 regions live (or fillable). |
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1547 SpaceId id; |
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1548 MutableSpace* space; |
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1549 size_t live_words; |
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1550 size_t fill_words; |
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1551 if (eden_live + eden_fillable >= region_size * 2) { |
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1552 id = eden_space_id; |
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1553 space = eden_space; |
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1554 live_words = eden_live; |
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1555 fill_words = eden_fillable; |
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1556 } else if (from_live + from_fillable >= region_size * 2) { |
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1557 id = from_space_id; |
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1558 space = from_space; |
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1559 live_words = from_live; |
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1560 fill_words = from_fillable; |
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1561 } else { |
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1562 return; // Give up. |
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1563 } |
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1564 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
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1565 |
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1566 if (live_words < region_size * 2) { |
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1567 // Fill from top() to end() w/live objects of mixed sizes. |
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1568 HeapWord* const fill_start = space->top(); |
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1569 live_words += fill_words; |
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1570 |
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1571 space->set_top(fill_start + fill_words); |
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1572 if (ZapUnusedHeapArea) { |
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1573 space->set_top_for_allocations(); |
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1574 } |
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1575 |
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1576 HeapWord* cur_addr = fill_start; |
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1577 while (fill_words > 0) { |
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1578 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1579 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1580 if (fill_words - cur_size < min_fill_size) { |
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1581 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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1582 } |
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1583 |
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1584 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1585 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1586 sd.add_obj(cur_addr, cur_size); |
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1587 |
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1588 cur_addr += cur_size; |
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1589 fill_words -= cur_size; |
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1590 } |
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1591 |
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1592 summarize_new_objects(id, fill_start); |
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1593 } |
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1594 |
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1595 max_compaction = false; |
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1596 |
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1597 // Manipulate the old gen so that it has room for about half of the live data |
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1598 // in the target young gen space (live_words / 2). |
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1599 id = old_space_id; |
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1600 space = _space_info[id].space(); |
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1601 const size_t free_at_end = space->free_in_words(); |
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1602 const size_t free_target = align_object_size(live_words / 2); |
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1603 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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1604 |
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1605 if (free_at_end >= free_target + min_fill_size) { |
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1606 // Fill space above top() and set the dense prefix so everything survives. |
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1607 HeapWord* const fill_start = space->top(); |
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1608 const size_t fill_size = free_at_end - free_target; |
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1609 space->set_top(space->top() + fill_size); |
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1610 if (ZapUnusedHeapArea) { |
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1611 space->set_top_for_allocations(); |
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1612 } |
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1613 fill_with_live_objects(id, fill_start, fill_size); |
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1614 summarize_new_objects(id, fill_start); |
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1615 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1616 } else if (dead + free_at_end > free_target) { |
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1617 // Find a dense prefix that makes the right amount of space available. |
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1618 HeapWord* cur = sd.region_align_down(space->top()); |
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1619 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1620 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1621 while (dead_to_right < free_target) { |
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1622 cur -= region_size; |
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1623 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1624 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1625 } |
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1626 _space_info[id].set_dense_prefix(cur); |
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1627 } |
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1628 } |
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1629 #endif // #ifndef PRODUCT |
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1630 |
0 | 1631 void PSParallelCompact::summarize_spaces_quick() |
1632 { | |
1633 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1634 const MutableSpace* space = _space_info[i].space(); | |
482
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1635 HeapWord** nta = _space_info[i].new_top_addr(); |
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1636 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1637 space->bottom(), space->top(), NULL, |
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1638 space->bottom(), space->end(), nta); |
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1639 assert(result, "space must fit into itself"); |
0 | 1640 _space_info[i].set_dense_prefix(space->bottom()); |
1641 } | |
496
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1642 |
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1643 #ifndef PRODUCT |
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1644 if (ParallelOldGCSplitALot) { |
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1645 provoke_split_fill_survivor(to_space_id); |
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1646 } |
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1647 #endif // #ifndef PRODUCT |
0 | 1648 } |
1649 | |
1650 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1651 { | |
1652 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1653 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1654 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
375
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1655 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1656 // Only enough dead space is filled so that any remaining dead space to the |
1657 // left is larger than the minimum filler object. (The remainder is filled | |
1658 // during the copy/update phase.) | |
1659 // | |
1660 // The size of the dead space to the right of the boundary is not a | |
1661 // concern, since compaction will be able to use whatever space is | |
1662 // available. | |
1663 // | |
1664 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1665 // surrounds the space to be filled with an object. | |
1666 // | |
1667 // In the 32-bit VM, each bit represents two 32-bit words: | |
1668 // +---+ | |
1669 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1670 // end_bits: ... x x x | 0 | || 0 x x ... | |
1671 // +---+ | |
1672 // | |
1673 // In the 64-bit VM, each bit represents one 64-bit word: | |
1674 // +------------+ | |
1675 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1676 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1677 // +------------+ | |
1678 // +-------+ | |
1679 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1680 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1681 // +-------+ | |
1682 // +-----------+ | |
1683 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1684 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1685 // +-----------+ | |
1686 // +-------+ | |
1687 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1688 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1689 // +-------+ | |
1690 | |
1691 // Initially assume case a, c or e will apply. | |
1571
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1692 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1693 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1694 | |
1695 #ifdef _LP64 | |
1571
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1696 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1697 // Cases a, c or e. |
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1698 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1699 // Case b above. |
1700 obj_beg = dense_prefix_end - 1; | |
1701 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1702 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1703 // Case d above. | |
1704 obj_beg = dense_prefix_end - 3; | |
1705 obj_len = 3; | |
1706 } | |
1707 #endif // #ifdef _LP64 | |
1708 | |
482
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1709 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1710 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1711 _summary_data.add_obj(obj_beg, obj_len); | |
1712 assert(start_array(id) != NULL, "sanity"); | |
1713 start_array(id)->allocate_block(obj_beg); | |
1714 } | |
1715 } | |
1716 | |
1717 void | |
482
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1718 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1719 { |
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1720 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1721 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1722 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1723 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1724 cur->set_source_region(0); |
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1725 } |
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1726 } |
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1727 |
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1728 void |
0 | 1729 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1730 { | |
1731 assert(id < last_space_id, "id out of range"); | |
483
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1732 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1733 ParallelOldGCSplitALot && id == old_space_id, |
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1734 "should have been reset in summarize_spaces_quick()"); |
0 | 1735 |
1736 const MutableSpace* space = _space_info[id].space(); | |
265
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1737 if (_space_info[id].new_top() != space->bottom()) { |
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1738 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1739 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1740 |
1741 #ifndef PRODUCT | |
265
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1742 if (TraceParallelOldGCDensePrefix) { |
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1743 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1744 dense_prefix_end); |
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1745 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1746 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1747 } |
0 | 1748 #endif // #ifndef PRODUCT |
1749 | |
483
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1750 // Recompute the summary data, taking into account the dense prefix. If |
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1751 // every last byte will be reclaimed, then the existing summary data which |
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1752 // compacts everything can be left in place. |
265
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1753 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1754 // If dead space crosses the dense prefix boundary, it is (at least |
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1755 // partially) filled with a dummy object, marked live and added to the |
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1756 // summary data. This simplifies the copy/update phase and must be done |
483
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1757 // before the final locations of objects are determined, to prevent |
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1758 // leaving a fragment of dead space that is too small to fill. |
265
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1759 fill_dense_prefix_end(id); |
482
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1760 |
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1761 // Compute the destination of each Region, and thus each object. |
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1762 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1763 _summary_data.summarize(_space_info[id].split_info(), |
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1764 dense_prefix_end, space->top(), NULL, |
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1765 dense_prefix_end, space->end(), |
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1766 _space_info[id].new_top_addr()); |
265
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1767 } |
0 | 1768 } |
1769 | |
1770 if (TraceParallelOldGCSummaryPhase) { | |
375
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1771 const size_t region_size = ParallelCompactData::RegionSize; |
265
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1772 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
375
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1773 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1774 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1775 HeapWord* const new_top = _space_info[id].new_top(); |
375
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1776 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1777 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1778 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
375
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1779 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1780 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1781 id, space->capacity_in_words(), dense_prefix_end, | |
375
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1782 dp_region, dp_words / region_size, |
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1783 cr_words / region_size, new_top); |
0 | 1784 } |
1785 } | |
1786 | |
482
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1787 #ifndef PRODUCT |
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1788 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1789 HeapWord* dst_beg, HeapWord* dst_end, |
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1790 SpaceId src_space_id, |
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1791 HeapWord* src_beg, HeapWord* src_end) |
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1792 { |
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1793 if (TraceParallelOldGCSummaryPhase) { |
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1794 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1795 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1796 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1797 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1798 SIZE_FORMAT "-" SIZE_FORMAT, |
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1799 src_space_id, space_names[src_space_id], |
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1800 dst_space_id, space_names[dst_space_id], |
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1801 src_beg, src_end, |
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1802 _summary_data.addr_to_region_idx(src_beg), |
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1803 _summary_data.addr_to_region_idx(src_end), |
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1804 dst_beg, dst_end, |
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1805 _summary_data.addr_to_region_idx(dst_beg), |
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1806 _summary_data.addr_to_region_idx(dst_end)); |
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1807 } |
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1808 } |
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1809 #endif // #ifndef PRODUCT |
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1810 |
0 | 1811 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1812 bool maximum_compaction) | |
1813 { | |
1814 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1815 // trace("2"); | |
1816 | |
1817 #ifdef ASSERT | |
1818 if (TraceParallelOldGCMarkingPhase) { | |
1819 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1820 "add_obj_bytes=" SIZE_FORMAT, | |
1821 add_obj_count, add_obj_size * HeapWordSize); | |
1822 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1823 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1824 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1825 } | |
1826 #endif // #ifdef ASSERT | |
1827 | |
1828 // Quick summarization of each space into itself, to see how much is live. | |
1829 summarize_spaces_quick(); | |
1830 | |
1831 if (TraceParallelOldGCSummaryPhase) { | |
1832 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1833 Universe::print(); | |
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1834 NOT_PRODUCT(print_region_ranges()); |
0 | 1835 if (Verbose) { |
1836 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1837 } | |
1838 } | |
1839 | |
1840 // The amount of live data that will end up in old space (assuming it fits). | |
1841 size_t old_space_total_live = 0; | |
482
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1842 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1843 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1844 _space_info[id].space()->bottom()); | |
1845 } | |
1846 | |
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1847 MutableSpace* const old_space = _space_info[old_space_id].space(); |
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1848 const size_t old_capacity = old_space->capacity_in_words(); |
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1849 if (old_space_total_live > old_capacity) { |
0 | 1850 // XXX - should also try to expand |
1851 maximum_compaction = true; | |
1852 } | |
483
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1853 #ifndef PRODUCT |
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1854 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1855 provoke_split(maximum_compaction); |
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1856 } |
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1857 #endif // #ifndef PRODUCT |
0 | 1858 |
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1859 // Old generations. |
0 | 1860 summarize_space(old_space_id, maximum_compaction); |
1861 | |
482
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1862 // Summarize the remaining spaces in the young gen. The initial target space |
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1863 // is the old gen. If a space does not fit entirely into the target, then the |
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1864 // remainder is compacted into the space itself and that space becomes the new |
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1865 // target. |
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1866 SpaceId dst_space_id = old_space_id; |
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1867 HeapWord* dst_space_end = old_space->end(); |
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1868 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1869 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1870 const MutableSpace* space = _space_info[id].space(); |
1871 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1872 space->bottom()); | |
482
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1873 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1874 |
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1875 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1876 SpaceId(id), space->bottom(), space->top());) |
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1877 if (live > 0 && live <= available) { |
0 | 1878 // All the live data will fit. |
482
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1879 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1880 space->bottom(), space->top(), |
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1881 NULL, |
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1882 *new_top_addr, dst_space_end, |
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1883 new_top_addr); |
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1884 assert(done, "space must fit into old gen"); |
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1885 |
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1886 // Reset the new_top value for the space. |
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1887 _space_info[id].set_new_top(space->bottom()); |
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1888 } else if (live > 0) { |
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1889 // Attempt to fit part of the source space into the target space. |
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1890 HeapWord* next_src_addr = NULL; |
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1891 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1892 space->bottom(), space->top(), |
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1893 &next_src_addr, |
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1894 *new_top_addr, dst_space_end, |
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1895 new_top_addr); |
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1896 assert(!done, "space should not fit into old gen"); |
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1897 assert(next_src_addr != NULL, "sanity"); |
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1898 |
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1899 // The source space becomes the new target, so the remainder is compacted |
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1900 // within the space itself. |
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1901 dst_space_id = SpaceId(id); |
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1902 dst_space_end = space->end(); |
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1903 new_top_addr = _space_info[id].new_top_addr(); |
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1904 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1905 space->bottom(), dst_space_end, |
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1906 SpaceId(id), next_src_addr, space->top());) |
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1907 done = _summary_data.summarize(_space_info[id].split_info(), |
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1908 next_src_addr, space->top(), |
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1909 NULL, |
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1910 space->bottom(), dst_space_end, |
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1911 new_top_addr); |
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1912 assert(done, "space must fit when compacted into itself"); |
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1913 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1914 } |
1915 } | |
1916 | |
1917 if (TraceParallelOldGCSummaryPhase) { | |
1918 tty->print_cr("summary_phase: after final summarization"); | |
1919 Universe::print(); | |
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1920 NOT_PRODUCT(print_region_ranges()); |
0 | 1921 if (Verbose) { |
1922 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1923 } | |
1924 } | |
1925 } | |
1926 | |
1927 // This method should contain all heap-specific policy for invoking a full | |
1928 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1929 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1930 // before full gc, or any other specialized behavior, it needs to be added here. | |
1931 // | |
1932 // Note that this method should only be called from the vm_thread while at a | |
1933 // safepoint. | |
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1934 // |
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1935 // Note that the all_soft_refs_clear flag in the collector policy |
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1936 // may be true because this method can be called without intervening |
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1937 // activity. For example when the heap space is tight and full measure |
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1938 // are being taken to free space. |
0 | 1939 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1940 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1941 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1942 "should be in vm thread"); | |
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1943 |
0 | 1944 ParallelScavengeHeap* heap = gc_heap(); |
1945 GCCause::Cause gc_cause = heap->gc_cause(); | |
1946 assert(!heap->is_gc_active(), "not reentrant"); | |
1947 | |
1948 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1949 IsGCActiveMark mark; |
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1950 |
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1951 if (ScavengeBeforeFullGC) { |
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1952 PSScavenge::invoke_no_policy(); |
0 | 1953 } |
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1954 |
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1955 const bool clear_all_soft_refs = |
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1956 heap->collector_policy()->should_clear_all_soft_refs(); |
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1957 |
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1958 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1959 maximum_heap_compaction); |
0 | 1960 } |
1961 | |
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1962 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1963 size_t addr_region_index = addr_to_region_idx(addr); |
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1964 return region_index == addr_region_index; |
0 | 1965 } |
1966 | |
1967 // This method contains no policy. You should probably | |
1968 // be calling invoke() instead. | |
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1969 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 1970 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
1971 assert(ref_processor() != NULL, "Sanity"); | |
1972 | |
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1973 if (GC_locker::check_active_before_gc()) { |
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1974 return false; |
0 | 1975 } |
1976 | |
1977 TimeStamp marking_start; | |
1978 TimeStamp compaction_start; | |
1979 TimeStamp collection_exit; | |
1980 | |
1981 ParallelScavengeHeap* heap = gc_heap(); | |
1982 GCCause::Cause gc_cause = heap->gc_cause(); | |
1983 PSYoungGen* young_gen = heap->young_gen(); | |
1984 PSOldGen* old_gen = heap->old_gen(); | |
1985 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
1986 | |
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1987 // The scope of casr should end after code that can change |
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1988 // CollectorPolicy::_should_clear_all_soft_refs. |
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1989 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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1990 heap->collector_policy()); |
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1991 |
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1992 if (ZapUnusedHeapArea) { |
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1993 // Save information needed to minimize mangling |
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1994 heap->record_gen_tops_before_GC(); |
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1995 } |
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1996 |
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1997 heap->pre_full_gc_dump(); |
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1998 |
0 | 1999 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2000 | |
2001 // Make sure data structures are sane, make the heap parsable, and do other | |
2002 // miscellaneous bookkeeping. | |
2003 PreGCValues pre_gc_values; | |
2004 pre_compact(&pre_gc_values); | |
2005 | |
210 | 2006 // Get the compaction manager reserved for the VM thread. |
2007 ParCompactionManager* const vmthread_cm = | |
2008 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2009 | |
0 | 2010 // Place after pre_compact() where the number of invocations is incremented. |
2011 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2012 | |
2013 { | |
2014 ResourceMark rm; | |
2015 HandleMark hm; | |
2016 | |
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2017 // Set the number of GC threads to be used in this collection |
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2018 gc_task_manager()->set_active_gang(); |
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2019 gc_task_manager()->task_idle_workers(); |
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2020 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2021 |
0 | 2022 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2023 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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2024 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 2025 TraceCollectorStats tcs(counters()); |
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2026 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2027 |
2028 if (TraceGen1Time) accumulated_time()->start(); | |
2029 | |
2030 // Let the size policy know we're starting | |
2031 size_policy->major_collection_begin(); | |
2032 | |
2033 CodeCache::gc_prologue(); | |
2034 Threads::gc_prologue(); | |
2035 | |
2036 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2037 | |
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2038 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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2039 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2040 |
2041 bool marked_for_unloading = false; | |
2042 | |
2043 marking_start.update(); | |
210 | 2044 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2045 |
2046 #ifndef PRODUCT | |
2047 if (TraceParallelOldGCMarkingPhase) { | |
2048 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
2049 "cas_by_another %d", | |
2050 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
2051 mark_bitmap()->cas_by_another()); | |
2052 } | |
2053 #endif // #ifndef PRODUCT | |
2054 | |
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2055 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2056 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2057 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2058 |
2059 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2060 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2061 | |
2062 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2063 // needed by the compaction for filling holes in the dense prefix. | |
2064 adjust_roots(); | |
2065 | |
2066 compaction_start.update(); | |
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2067 compact(); |
0 | 2068 |
2069 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2070 // done before resizing. | |
2071 post_compact(); | |
2072 | |
2073 // Let the size policy know we're done | |
2074 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2075 | |
2076 if (UseAdaptiveSizePolicy) { | |
2077 if (PrintAdaptiveSizePolicy) { | |
2078 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2079 gclog_or_tty->stamp(); | |
2080 gclog_or_tty->print_cr(" collection: %d ", | |
2081 heap->total_collections()); | |
2082 if (Verbose) { | |
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2083 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2084 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2085 } |
2086 } | |
2087 | |
2088 // Don't check if the size_policy is ready here. Let | |
2089 // the size_policy check that internally. | |
2090 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2091 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2092 UseAdaptiveSizePolicyWithSystemGC)) { | |
2093 // Calculate optimal free space amounts | |
2094 assert(young_gen->max_size() > | |
2095 young_gen->from_space()->capacity_in_bytes() + | |
2096 young_gen->to_space()->capacity_in_bytes(), | |
2097 "Sizes of space in young gen are out-of-bounds"); | |
2098 size_t max_eden_size = young_gen->max_size() - | |
2099 young_gen->from_space()->capacity_in_bytes() - | |
2100 young_gen->to_space()->capacity_in_bytes(); | |
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2101 size_policy->compute_generation_free_space( |
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2102 young_gen->used_in_bytes(), |
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2103 young_gen->eden_space()->used_in_bytes(), |
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2104 old_gen->used_in_bytes(), |
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2105 young_gen->eden_space()->capacity_in_bytes(), |
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2106 old_gen->max_gen_size(), |
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2107 max_eden_size, |
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2108 true /* full gc*/, |
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2109 gc_cause, |
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2110 heap->collector_policy()); |
263
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2111 |
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2112 heap->resize_old_gen( |
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2113 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2114 |
2115 // Don't resize the young generation at an major collection. A | |
2116 // desired young generation size may have been calculated but | |
2117 // resizing the young generation complicates the code because the | |
2118 // resizing of the old generation may have moved the boundary | |
2119 // between the young generation and the old generation. Let the | |
2120 // young generation resizing happen at the minor collections. | |
2121 } | |
2122 if (PrintAdaptiveSizePolicy) { | |
2123 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2124 heap->total_collections()); | |
2125 } | |
2126 } | |
2127 | |
2128 if (UsePerfData) { | |
2129 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2130 counters->update_counters(); | |
2131 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2132 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2133 } | |
2134 | |
2135 heap->resize_all_tlabs(); | |
2136 | |
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2137 // Resize the metaspace capactiy after a collection |
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2138 MetaspaceGC::compute_new_size(); |
0 | 2139 |
2140 if (TraceGen1Time) accumulated_time()->stop(); | |
2141 | |
2142 if (PrintGC) { | |
2143 if (PrintGCDetails) { | |
2144 // No GC timestamp here. This is after GC so it would be confusing. | |
2145 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2146 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2147 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2148 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2149 } else { |
2150 heap->print_heap_change(pre_gc_values.heap_used()); | |
2151 } | |
2152 } | |
2153 | |
2154 // Track memory usage and detect low memory | |
2155 MemoryService::track_memory_usage(); | |
2156 heap->update_counters(); | |
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2157 gc_task_manager()->release_idle_workers(); |
0 | 2158 } |
2159 | |
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2160 #ifdef ASSERT |
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2161 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2162 ParCompactionManager* const cm = |
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2163 ParCompactionManager::manager_array(int(i)); |
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2164 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2165 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
1836
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2166 } |
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|
2167 #endif // ASSERT |
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2168 |
0 | 2169 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2170 HandleMark hm; // Discard invalid handles created during verification | |
2171 gclog_or_tty->print(" VerifyAfterGC:"); | |
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2172 Universe::verify(); |
0 | 2173 } |
2174 | |
2175 // Re-verify object start arrays | |
2176 if (VerifyObjectStartArray && | |
2177 VerifyAfterGC) { | |
2178 old_gen->verify_object_start_array(); | |
2179 } | |
2180 | |
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2181 if (ZapUnusedHeapArea) { |
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2182 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2183 } |
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2184 |
0 | 2185 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2186 | |
2187 collection_exit.update(); | |
2188 | |
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2189 heap->print_heap_after_gc(); |
0 | 2190 if (PrintGCTaskTimeStamps) { |
2191 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2192 INT64_FORMAT, | |
2193 marking_start.ticks(), compaction_start.ticks(), | |
2194 collection_exit.ticks()); | |
2195 gc_task_manager()->print_task_time_stamps(); | |
2196 } | |
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2197 |
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2198 heap->post_full_gc_dump(); |
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2199 |
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2200 #ifdef TRACESPINNING |
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2201 ParallelTaskTerminator::print_termination_counts(); |
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2202 #endif |
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2203 |
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2204 return true; |
0 | 2205 } |
2206 | |
2207 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2208 PSYoungGen* young_gen, | |
2209 PSOldGen* old_gen) { | |
2210 MutableSpace* const eden_space = young_gen->eden_space(); | |
2211 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2212 assert(young_gen->virtual_space()->alignment() == | |
2213 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2214 | |
2215 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2216 return false; | |
2217 } | |
2218 | |
2219 // Both generations must be completely committed. | |
2220 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2221 return false; | |
2222 } | |
2223 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2224 return false; | |
2225 } | |
2226 | |
2227 // Figure out how much to take from eden. Include the average amount promoted | |
2228 // in the total; otherwise the next young gen GC will simply bail out to a | |
2229 // full GC. | |
2230 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2231 const size_t eden_used = eden_space->used_in_bytes(); | |
2232 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2233 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2234 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2235 | |
2236 if (absorb_size >= eden_capacity) { | |
2237 return false; // Must leave some space in eden. | |
2238 } | |
2239 | |
2240 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2241 if (new_young_size < young_gen->min_gen_size()) { | |
2242 return false; // Respect young gen minimum size. | |
2243 } | |
2244 | |
2245 if (TraceAdaptiveGCBoundary && Verbose) { | |
2246 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2247 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2248 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2249 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2250 absorb_size / K, | |
2251 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2252 young_gen->from_space()->used_in_bytes() / K, | |
2253 young_gen->to_space()->used_in_bytes() / K, | |
2254 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2255 } | |
2256 | |
2257 // Fill the unused part of the old gen. | |
2258 MutableSpace* const old_space = old_gen->object_space(); | |
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2259 HeapWord* const unused_start = old_space->top(); |
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2260 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2261 |
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2262 if (unused_words > 0) { |
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2263 if (unused_words < CollectedHeap::min_fill_size()) { |
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2264 return false; // If the old gen cannot be filled, must give up. |
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2265 } |
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2266 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2267 } |
2268 | |
2269 // Take the live data from eden and set both top and end in the old gen to | |
2270 // eden top. (Need to set end because reset_after_change() mangles the region | |
2271 // from end to virtual_space->high() in debug builds). | |
2272 HeapWord* const new_top = eden_space->top(); | |
2273 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2274 absorb_size); | |
2275 young_gen->reset_after_change(); | |
2276 old_space->set_top(new_top); | |
2277 old_space->set_end(new_top); | |
2278 old_gen->reset_after_change(); | |
2279 | |
2280 // Update the object start array for the filler object and the data from eden. | |
2281 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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2282 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2283 start_array->allocate_block(p); |
0 | 2284 } |
2285 | |
2286 // Could update the promoted average here, but it is not typically updated at | |
2287 // full GCs and the value to use is unclear. Something like | |
2288 // | |
2289 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2290 | |
2291 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2292 return true; | |
2293 } | |
2294 | |
2295 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2296 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2297 "shouldn't return NULL"); | |
2298 return ParallelScavengeHeap::gc_task_manager(); | |
2299 } | |
2300 | |
2301 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2302 bool maximum_heap_compaction) { | |
2303 // Recursively traverse all live objects and mark them | |
2304 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2305 | |
2306 ParallelScavengeHeap* heap = gc_heap(); | |
2307 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2308 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2309 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2310 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2311 |
2312 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2313 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2314 | |
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2315 // Need new claim bits before marking starts. |
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2316 ClassLoaderDataGraph::clear_claimed_marks(); |
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2317 |
0 | 2318 { |
2319 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
989
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2320 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2321 |
2322 GCTaskQueue* q = GCTaskQueue::create(); | |
2323 | |
2324 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2325 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2326 // We scan the thread roots in parallel | |
2327 Threads::create_thread_roots_marking_tasks(q); | |
2328 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2329 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2330 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2331 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2332 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2333 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2334 |
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2335 if (active_gc_threads > 1) { |
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2336 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2337 q->enqueue(new StealMarkingTask(&terminator)); |
2338 } | |
2339 } | |
2340 | |
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2341 gc_task_manager()->execute_and_wait(q); |
0 | 2342 } |
2343 | |
2344 // Process reference objects found during marking | |
2345 { | |
2346 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2347 if (ref_processor()->processing_is_mt()) { | |
2348 RefProcTaskExecutor task_executor; | |
2349 ref_processor()->process_discovered_references( | |
453
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2350 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2351 &task_executor); |
0 | 2352 } else { |
2353 ref_processor()->process_discovered_references( | |
453
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2354 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2355 } |
2356 } | |
2357 | |
2358 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2359 // Follow system dictionary roots and unload classes. | |
2360 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2361 | |
2362 // Follow code cache roots. | |
6787
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2363 CodeCache::do_unloading(is_alive_closure(), purged_class); |
1311
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2364 cm->follow_marking_stacks(); // Flush marking stack. |
0 | 2365 |
2366 // Update subklass/sibling/implementor links of live klasses | |
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2367 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2368 |
2177
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2369 // Visit interned string tables and delete unmarked oops |
0 | 2370 StringTable::unlink(is_alive_closure()); |
2177
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2371 // Clean up unreferenced symbols in symbol table. |
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2372 SymbolTable::unlink(); |
0 | 2373 |
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2374 assert(cm->marking_stacks_empty(), "marking stacks should be empty"); |
0 | 2375 } |
2376 | |
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2377 void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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2378 ClassLoaderData* cld = klass->class_loader_data(); |
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2379 // The actual processing of the klass is done when we |
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2380 // traverse the list of Klasses in the class loader data. |
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2381 PSParallelCompact::follow_class_loader(cm, cld); |
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2382 } |
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2383 |
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2384 void PSParallelCompact::adjust_klass(ParCompactionManager* cm, Klass* klass) { |
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2385 ClassLoaderData* cld = klass->class_loader_data(); |
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2386 // The actual processing of the klass is done when we |
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2387 // traverse the list of Klasses in the class loader data. |
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2388 PSParallelCompact::adjust_class_loader(cm, cld); |
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2389 } |
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2390 |
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2391 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2392 ClassLoaderData* cld) { |
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2393 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2394 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2395 |
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2396 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2397 } |
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2398 |
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2399 void PSParallelCompact::adjust_class_loader(ParCompactionManager* cm, |
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2400 ClassLoaderData* cld) { |
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2401 cld->oops_do(PSParallelCompact::adjust_pointer_closure(), |
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2402 PSParallelCompact::adjust_klass_closure(), |
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2403 true); |
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2404 } |
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2405 |
0 | 2406 // This should be moved to the shared markSweep code! |
2407 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2408 public: | |
2409 void do_object(oop p) { ShouldNotReachHere(); } | |
2410 bool do_object_b(oop p) { return true; } | |
2411 }; | |
2412 static PSAlwaysTrueClosure always_true; | |
2413 | |
2414 void PSParallelCompact::adjust_roots() { | |
2415 // Adjust the pointers to reflect the new locations | |
2416 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2417 | |
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2418 // Need new claim bits when tracing through and adjusting pointers. |
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2419 ClassLoaderDataGraph::clear_claimed_marks(); |
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2420 |
0 | 2421 // General strong roots. |
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2422 Universe::oops_do(adjust_pointer_closure()); |
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2423 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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2424 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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2425 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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2426 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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2427 FlatProfiler::oops_do(adjust_pointer_closure()); |
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2428 Management::oops_do(adjust_pointer_closure()); |
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2429 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 2430 // SO_AllClasses |
10179
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2431 SystemDictionary::oops_do(adjust_pointer_closure()); |
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2432 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 2433 |
2434 // Now adjust pointers in remaining weak roots. (All of which should | |
2435 // have been cleared if they pointed to non-surviving objects.) | |
2436 // Global (weak) JNI handles | |
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2437 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 2438 |
2439 CodeCache::oops_do(adjust_pointer_closure()); | |
10179
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2440 StringTable::oops_do(adjust_pointer_closure()); |
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2441 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2442 // Roots were visited so references into the young gen in roots |
2443 // may have been scanned. Process them also. | |
2444 // Should the reference processor have a span that excludes | |
2445 // young gen objects? | |
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2446 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2447 } |
2448 | |
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2449 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2450 uint parallel_gc_threads) |
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2451 { |
0 | 2452 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2453 | |
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2454 // Find the threads that are active |
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2455 unsigned int which = 0; |
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2456 |
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2457 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2458 for (uint j = 0; j < task_count; j++) { |
1833
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2459 q->enqueue(new DrainStacksCompactionTask(j)); |
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2460 ParCompactionManager::verify_region_list_empty(j); |
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2461 // Set the region stacks variables to "no" region stack values |
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2462 // so that they will be recognized and needing a region stack |
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2463 // in the stealing tasks if they do not get one by executing |
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2464 // a draining stack. |
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2465 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2466 cm->set_region_stack(NULL); |
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2467 cm->set_region_stack_index((uint)max_uintx); |
0 | 2468 } |
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2469 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2470 |
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2471 // Find all regions that are available (can be filled immediately) and |
0 | 2472 // distribute them to the thread stacks. The iteration is done in reverse |
375
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2473 // order (high to low) so the regions will be removed in ascending order. |
0 | 2474 |
2475 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2476 | |
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2477 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2478 // A region index which corresponds to the tasks created above. |
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2479 // "which" must be 0 <= which < task_count |
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2480 |
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2481 which = 0; |
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2482 // id + 1 is used to test termination so unsigned can |
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2483 // be used with an old_space_id == 0. |
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2484 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2485 SpaceInfo* const space_info = _space_info + id; |
2486 MutableSpace* const space = space_info->space(); | |
2487 HeapWord* const new_top = space_info->new_top(); | |
2488 | |
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2489 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2490 const size_t end_region = |
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2491 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2492 |
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2493 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
375
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2494 if (sd.region(cur)->claim_unsafe()) { |
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2495 ParCompactionManager::region_list_push(which, cur); |
0 | 2496 |
2497 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
375
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2498 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2499 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
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2500 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2501 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2502 } | |
2503 | |
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2504 NOT_PRODUCT(++fillable_regions;) |
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2505 |
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2506 // Assign regions to tasks in round-robin fashion. |
0 | 2507 if (++which == task_count) { |
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2508 assert(which <= parallel_gc_threads, |
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2509 "Inconsistent number of workers"); |
0 | 2510 which = 0; |
2511 } | |
2512 } | |
2513 } | |
2514 } | |
2515 | |
2516 if (TraceParallelOldGCCompactionPhase) { | |
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2517 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2518 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2519 } |
2520 } | |
2521 | |
2522 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2523 | |
2524 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2525 uint parallel_gc_threads) { | |
2526 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2527 | |
2528 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2529 | |
2530 // Iterate over all the spaces adding tasks for updating | |
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2531 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2532 // will work on opening the gaps and the remaining gc threads |
2533 // will work on the dense prefix. | |
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2534 unsigned int space_id; |
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2535 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2536 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2537 const MutableSpace* const space = _space_info[space_id].space(); | |
2538 | |
2539 if (dense_prefix_end == space->bottom()) { | |
2540 // There is no dense prefix for this space. | |
2541 continue; | |
2542 } | |
2543 | |
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2544 // The dense prefix is before this region. |
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2545 size_t region_index_end_dense_prefix = |
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2546 sd.addr_to_region_idx(dense_prefix_end); |
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2547 RegionData* const dense_prefix_cp = |
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2548 sd.region(region_index_end_dense_prefix); |
0 | 2549 assert(dense_prefix_end == space->end() || |
2550 dense_prefix_cp->available() || | |
2551 dense_prefix_cp->claimed(), | |
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2552 "The region after the dense prefix should always be ready to fill"); |
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2553 |
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2554 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2555 |
2556 // Is there dense prefix work? | |
375
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2557 size_t total_dense_prefix_regions = |
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2558 region_index_end_dense_prefix - region_index_start; |
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2559 // How many regions of the dense prefix should be given to |
0 | 2560 // each thread? |
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2561 if (total_dense_prefix_regions > 0) { |
0 | 2562 uint tasks_for_dense_prefix = 1; |
3251
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2563 if (total_dense_prefix_regions <= |
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2564 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2565 // Don't over partition. This assumes that |
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2566 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2567 // so there are not many regions to process. |
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2568 tasks_for_dense_prefix = parallel_gc_threads; |
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2569 } else { |
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2570 // Over partition |
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2571 tasks_for_dense_prefix = parallel_gc_threads * |
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2572 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2573 } |
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2574 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2575 tasks_for_dense_prefix; |
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2576 // Give each thread at least 1 region. |
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2577 if (regions_per_thread == 0) { |
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2578 regions_per_thread = 1; |
0 | 2579 } |
2580 | |
2581 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
375
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2582 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2583 break; |
2584 } | |
375
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2585 // region_index_end is not processed |
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2586 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2587 region_index_end_dense_prefix); |
482
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2588 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2589 region_index_start, |
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2590 region_index_end)); |
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2591 region_index_start = region_index_end; |
0 | 2592 } |
2593 } | |
2594 // This gets any part of the dense prefix that did not | |
2595 // fit evenly. | |
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2596 if (region_index_start < region_index_end_dense_prefix) { |
482
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2597 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2598 region_index_start, |
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2599 region_index_end_dense_prefix)); |
0 | 2600 } |
482
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2601 } |
0 | 2602 } |
2603 | |
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2604 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2605 GCTaskQueue* q, |
2606 ParallelTaskTerminator* terminator_ptr, | |
2607 uint parallel_gc_threads) { | |
2608 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2609 | |
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2610 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2611 // other threads. |
2612 if (parallel_gc_threads > 1) { | |
2613 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2614 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2615 } |
2616 } | |
2617 } | |
2618 | |
2619 void PSParallelCompact::compact() { | |
2620 // trace("5"); | |
2621 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2622 | |
2623 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2624 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2625 PSOldGen* old_gen = heap->old_gen(); | |
2626 old_gen->start_array()->reset(); | |
2627 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2628 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2629 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2630 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2631 |
2632 GCTaskQueue* q = GCTaskQueue::create(); | |
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2633 enqueue_region_draining_tasks(q, active_gc_threads); |
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2634 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2635 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2636 |
2637 { | |
2638 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2639 | |
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2640 gc_task_manager()->execute_and_wait(q); |
0 | 2641 |
2642 #ifdef ASSERT | |
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2643 // Verify that all regions have been processed before the deferred updates. |
0 | 2644 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2645 verify_complete(SpaceId(id)); | |
2646 } | |
2647 #endif | |
2648 } | |
2649 | |
2650 { | |
2651 // Update the deferred objects, if any. Any compaction manager can be used. | |
2652 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2653 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2654 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2655 update_deferred_objects(cm, SpaceId(id)); | |
2656 } | |
2657 } | |
2658 } | |
2659 | |
2660 #ifdef ASSERT | |
2661 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2662 // All Regions between space bottom() to new_top() should be marked as filled |
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2663 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2664 // should have been emptied). |
2665 ParallelCompactData& sd = summary_data(); | |
2666 SpaceInfo si = _space_info[space_id]; | |
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2667 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2668 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2669 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2670 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2671 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2672 |
2673 bool issued_a_warning = false; | |
2674 | |
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2675 size_t cur_region; |
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2676 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2677 const RegionData* const c = sd.region(cur_region); |
0 | 2678 if (!c->completed()) { |
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2679 warning("region " SIZE_FORMAT " not filled: " |
0 | 2680 "destination_count=" SIZE_FORMAT, |
375
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2681 cur_region, c->destination_count()); |
0 | 2682 issued_a_warning = true; |
2683 } | |
2684 } | |
2685 | |
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2686 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2687 const RegionData* const c = sd.region(cur_region); |
0 | 2688 if (!c->available()) { |
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2689 warning("region " SIZE_FORMAT " not empty: " |
0 | 2690 "destination_count=" SIZE_FORMAT, |
375
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2691 cur_region, c->destination_count()); |
0 | 2692 issued_a_warning = true; |
2693 } | |
2694 } | |
2695 | |
2696 if (issued_a_warning) { | |
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2697 print_region_ranges(); |
0 | 2698 } |
2699 } | |
2700 #endif // #ifdef ASSERT | |
2701 | |
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2702 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2703 void |
2704 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2705 SpaceId space_id, | |
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2706 size_t beg_region, |
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2707 size_t end_region) { |
0 | 2708 ParallelCompactData& sd = summary_data(); |
2709 ParMarkBitMap* const mbm = mark_bitmap(); | |
2710 | |
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2711 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2712 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2713 assert(beg_region <= end_region, "bad region range"); |
0 | 2714 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2715 | |
2716 #ifdef ASSERT | |
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2717 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2718 // filled. |
375
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2719 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2720 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2721 } |
2722 #endif // #ifdef ASSERT | |
2723 | |
2724 if (beg_addr != space(space_id)->bottom()) { | |
2725 // Find the first live object or block of dead space that *starts* in this | |
375
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2726 // range of regions. If a partial object crosses onto the region, skip it; |
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2727 // it will be marked for 'deferred update' when the object head is |
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2728 // processed. If dead space crosses onto the region, it is also skipped; it |
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2729 // will be filled when the prior region is processed. If neither of those |
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2730 // apply, the first word in the region is the start of a live object or dead |
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2731 // space. |
0 | 2732 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2733 const RegionData* const cp = sd.region(beg_region); |
0 | 2734 if (cp->partial_obj_size() != 0) { |
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2735 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2736 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2737 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2738 } | |
2739 } | |
2740 | |
2741 if (beg_addr < end_addr) { | |
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2742 // A live object or block of dead space starts in this range of Regions. |
0 | 2743 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2744 | |
2745 // Create closures and iterate. | |
2746 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2747 FillClosure fill_closure(cm, space_id); | |
2748 ParMarkBitMap::IterationStatus status; | |
2749 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2750 dense_prefix_end); | |
2751 if (status == ParMarkBitMap::incomplete) { | |
2752 update_closure.do_addr(update_closure.source()); | |
2753 } | |
2754 } | |
2755 | |
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2756 // Mark the regions as filled. |
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2757 RegionData* const beg_cp = sd.region(beg_region); |
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2758 RegionData* const end_cp = sd.region(end_region); |
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2759 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2760 cp->set_completed(); |
2761 } | |
2762 } | |
2763 | |
2764 // Return the SpaceId for the space containing addr. If addr is not in the | |
2765 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2766 // in the heap and asserts such. | |
2767 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2768 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2769 | |
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2770 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2771 if (_space_info[id].space()->contains(addr)) { |
2772 return SpaceId(id); | |
2773 } | |
2774 } | |
2775 | |
2776 assert(false, "no space contains the addr"); | |
2777 return last_space_id; | |
2778 } | |
2779 | |
2780 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2781 SpaceId id) { | |
2782 assert(id < last_space_id, "bad space id"); | |
2783 | |
2784 ParallelCompactData& sd = summary_data(); | |
2785 const SpaceInfo* const space_info = _space_info + id; | |
2786 ObjectStartArray* const start_array = space_info->start_array(); | |
2787 | |
2788 const MutableSpace* const space = space_info->space(); | |
2789 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2790 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2791 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2792 |
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2793 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2794 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2795 const RegionData* cur_region; |
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2796 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2797 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2798 if (addr != NULL) { |
2799 if (start_array != NULL) { | |
2800 start_array->allocate_block(addr); | |
2801 } | |
2802 oop(addr)->update_contents(cm); | |
2803 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2804 } | |
2805 } | |
2806 } | |
2807 | |
2808 // Skip over count live words starting from beg, and return the address of the | |
2809 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2810 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2811 // an object, or account for those live words in some other way. Callers must | |
2812 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2813 HeapWord* | |
2814 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2815 { | |
2816 assert(count > 0, "sanity"); | |
2817 | |
2818 ParMarkBitMap* m = mark_bitmap(); | |
2819 idx_t bits_to_skip = m->words_to_bits(count); | |
2820 idx_t cur_beg = m->addr_to_bit(beg); | |
2821 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2822 | |
2823 do { | |
2824 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2825 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2826 const size_t obj_bits = cur_end - cur_beg + 1; | |
2827 if (obj_bits > bits_to_skip) { | |
2828 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2829 } | |
2830 bits_to_skip -= obj_bits; | |
2831 cur_beg = cur_end + 1; | |
2832 } while (bits_to_skip > 0); | |
2833 | |
2834 // Skipping the desired number of words landed just past the end of an object. | |
2835 // Find the start of the next object. | |
2836 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2837 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2838 return m->bit_to_addr(cur_beg); | |
2839 } | |
2840 | |
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2841 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2842 SpaceId src_space_id, |
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2843 size_t src_region_idx) |
0 | 2844 { |
482
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2845 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2846 |
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2847 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2848 if (split_info.dest_region_addr() == dest_addr) { |
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2849 // The partial object ending at the split point contains the first word to |
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2850 // be copied to dest_addr. |
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2851 return split_info.first_src_addr(); |
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2852 } |
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2853 |
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2854 const ParallelCompactData& sd = summary_data(); |
0 | 2855 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2856 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2857 |
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2858 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2859 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2860 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2861 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2862 |
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2863 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2864 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2865 |
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2866 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2867 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2868 |
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2869 HeapWord* addr = src_region_beg; |
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2870 if (dest_addr == src_region_destination) { |
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2871 // Return the first live word in the source region. |
0 | 2872 if (partial_obj_size == 0) { |
375
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2873 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2874 assert(addr < src_region_end, "no objects start in src region"); |
0 | 2875 } |
2876 return addr; | |
2877 } | |
2878 | |
2879 // Must skip some live data. | |
375
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2880 size_t words_to_skip = dest_addr - src_region_destination; |
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2881 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 2882 |
2883 if (partial_obj_size >= words_to_skip) { | |
2884 // All the live words to skip are part of the partial object. | |
2885 addr += words_to_skip; | |
2886 if (partial_obj_size == words_to_skip) { | |
2887 // Find the first live word past the partial object. | |
375
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2888 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2889 assert(addr < src_region_end, "wrong src region"); |
0 | 2890 } |
2891 return addr; | |
2892 } | |
2893 | |
2894 // Skip over the partial object (if any). | |
2895 if (partial_obj_size != 0) { | |
2896 words_to_skip -= partial_obj_size; | |
2897 addr += partial_obj_size; | |
2898 } | |
2899 | |
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2900 // Skip over live words due to objects that start in the region. |
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2901 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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2902 assert(addr < src_region_end, "wrong src region"); |
0 | 2903 return addr; |
2904 } | |
2905 | |
2906 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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2907 SpaceId src_space_id, |
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2908 size_t beg_region, |
0 | 2909 HeapWord* end_addr) |
2910 { | |
2911 ParallelCompactData& sd = summary_data(); | |
495
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2912 |
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2913 #ifdef ASSERT |
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2914 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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2915 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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2916 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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2917 "src_space_id does not match beg_addr"); |
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2918 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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2919 "src_space_id does not match end_addr"); |
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2920 #endif // #ifdef ASSERT |
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2921 |
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2922 RegionData* const beg = sd.region(beg_region); |
495
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2923 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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2924 |
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2925 // Regions up to new_top() are enqueued if they become available. |
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2926 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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2927 RegionData* const enqueue_end = |
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2928 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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2929 |
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2930 for (RegionData* cur = beg; cur < end; ++cur) { |
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2931 assert(cur->data_size() > 0, "region must have live data"); |
0 | 2932 cur->decrement_destination_count(); |
495
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2933 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 2934 cm->push_region(sd.region(cur)); |
0 | 2935 } |
2936 } | |
2937 } | |
2938 | |
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2939 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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2940 SpaceId& src_space_id, |
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2941 HeapWord*& src_space_top, |
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2942 HeapWord* end_addr) |
0 | 2943 { |
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2944 typedef ParallelCompactData::RegionData RegionData; |
0 | 2945 |
2946 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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2947 const size_t region_size = ParallelCompactData::RegionSize; |
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2948 |
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2949 size_t src_region_idx = 0; |
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2950 |
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2951 // Skip empty regions (if any) up to the top of the space. |
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2952 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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2953 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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2954 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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2955 const RegionData* const top_region_ptr = |
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2956 sd.addr_to_region_ptr(top_aligned_up); |
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2957 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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2958 ++src_region_ptr; |
0 | 2959 } |
2960 | |
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2961 if (src_region_ptr < top_region_ptr) { |
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2962 // The next source region is in the current space. Update src_region_idx |
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2963 // and the source address to match src_region_ptr. |
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2964 src_region_idx = sd.region(src_region_ptr); |
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2965 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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2966 if (src_region_addr > closure.source()) { |
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2967 closure.set_source(src_region_addr); |
0 | 2968 } |
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2969 return src_region_idx; |
0 | 2970 } |
2971 | |
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2972 // Switch to a new source space and find the first non-empty region. |
0 | 2973 unsigned int space_id = src_space_id + 1; |
2974 assert(space_id < last_space_id, "not enough spaces"); | |
2975 | |
2976 HeapWord* const destination = closure.destination(); | |
2977 | |
2978 do { | |
2979 MutableSpace* space = _space_info[space_id].space(); | |
2980 HeapWord* const bottom = space->bottom(); | |
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2981 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 2982 |
2983 // Iterate over the spaces that do not compact into themselves. | |
2984 if (bottom_cp->destination() != bottom) { | |
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2985 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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2986 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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2987 |
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2988 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 2989 if (src_cp->live_obj_size() > 0) { |
2990 // Found it. | |
2991 assert(src_cp->destination() == destination, | |
2992 "first live obj in the space must match the destination"); | |
2993 assert(src_cp->partial_obj_size() == 0, | |
2994 "a space cannot begin with a partial obj"); | |
2995 | |
2996 src_space_id = SpaceId(space_id); | |
2997 src_space_top = space->top(); | |
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2998 const size_t src_region_idx = sd.region(src_cp); |
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2999 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3000 return src_region_idx; |
0 | 3001 } else { |
3002 assert(src_cp->data_size() == 0, "sanity"); | |
3003 } | |
3004 } | |
3005 } | |
3006 } while (++space_id < last_space_id); | |
3007 | |
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3008 assert(false, "no source region was found"); |
0 | 3009 return 0; |
3010 } | |
3011 | |
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3012 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3013 { |
3014 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
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3015 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3016 ParMarkBitMap* const bitmap = mark_bitmap(); |
3017 ParallelCompactData& sd = summary_data(); | |
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3018 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3019 |
3020 // Get the items needed to construct the closure. | |
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3021 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3022 SpaceId dest_space_id = space_id(dest_addr); |
3023 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3024 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3025 assert(dest_addr < new_top, "sanity"); | |
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3026 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3027 |
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3028 // Get the source region and related info. |
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3029 size_t src_region_idx = region_ptr->source_region(); |
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3030 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3031 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3032 | |
3033 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3034 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
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3035 |
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3036 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3037 // destination count is not decremented when a region is copied to itself). |
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3038 if (src_region_idx == region_idx) { |
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3039 src_region_idx += 1; |
0 | 3040 } |
3041 | |
3042 if (bitmap->is_unmarked(closure.source())) { | |
3043 // The first source word is in the middle of an object; copy the remainder | |
3044 // of the object or as much as will fit. The fact that pointer updates were | |
3045 // deferred will be noted when the object header is processed. | |
3046 HeapWord* const old_src_addr = closure.source(); | |
3047 closure.copy_partial_obj(); | |
3048 if (closure.is_full()) { | |
495
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3049 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3050 closure.source()); |
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3051 region_ptr->set_deferred_obj_addr(NULL); |
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3052 region_ptr->set_completed(); |
0 | 3053 return; |
3054 } | |
3055 | |
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3056 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3057 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3058 // The partial object was copied from more than one source region. |
495
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3059 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3060 |
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3061 // Move to the next source region, possibly switching spaces as well. All |
0 | 3062 // args except end_addr may be modified. |
375
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3063 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3064 end_addr); |
0 | 3065 } |
3066 } | |
3067 | |
3068 do { | |
3069 HeapWord* const cur_addr = closure.source(); | |
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3070 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3071 src_space_top); |
3072 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3073 | |
3074 if (status == ParMarkBitMap::incomplete) { | |
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3075 // The last obj that starts in the source region does not end in the |
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3076 // region. |
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3077 assert(closure.source() < end_addr, "sanity"); |
0 | 3078 HeapWord* const obj_beg = closure.source(); |
3079 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3080 src_space_top); | |
3081 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3082 if (obj_end < range_end) { | |
3083 // The end was found; the entire object will fit. | |
3084 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3085 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3086 } else { | |
3087 // The end was not found; the object will not fit. | |
3088 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3089 status = ParMarkBitMap::would_overflow; | |
3090 } | |
3091 } | |
3092 | |
3093 if (status == ParMarkBitMap::would_overflow) { | |
3094 // The last object did not fit. Note that interior oop updates were | |
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3095 // deferred, then copy enough of the object to fill the region. |
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3096 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3097 status = closure.copy_until_full(); // copies from closure.source() |
3098 | |
495
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3099 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3100 closure.source()); |
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3101 region_ptr->set_completed(); |
0 | 3102 return; |
3103 } | |
3104 | |
3105 if (status == ParMarkBitMap::full) { | |
495
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3106 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3107 closure.source()); |
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3108 region_ptr->set_deferred_obj_addr(NULL); |
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3109 region_ptr->set_completed(); |
0 | 3110 return; |
3111 } | |
3112 | |
495
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3113 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3114 |
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3115 // Move to the next source region, possibly switching spaces as well. All |
0 | 3116 // args except end_addr may be modified. |
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3117 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3118 end_addr); |
0 | 3119 } while (true); |
3120 } | |
3121 | |
3122 void | |
3123 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3124 const MutableSpace* sp = space(space_id); | |
3125 if (sp->is_empty()) { | |
3126 return; | |
3127 } | |
3128 | |
3129 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3130 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3131 HeapWord* const dp_addr = dense_prefix(space_id); | |
3132 HeapWord* beg_addr = sp->bottom(); | |
3133 HeapWord* end_addr = sp->top(); | |
3134 | |
3135 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3136 | |
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3137 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3138 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3139 if (beg_region < dp_region) { |
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3140 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3141 } |
3142 | |
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3143 // The destination of the first live object that starts in the region is one |
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3144 // past the end of the partial object entering the region (if any). |
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3145 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3146 HeapWord* const new_top = _space_info[space_id].new_top(); |
3147 assert(new_top >= dest_addr, "bad new_top value"); | |
3148 const size_t words = pointer_delta(new_top, dest_addr); | |
3149 | |
3150 if (words > 0) { | |
3151 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3152 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3153 | |
3154 ParMarkBitMap::IterationStatus status; | |
3155 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3156 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3157 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3158 "live objects skipped because closure is full"); | |
3159 } | |
3160 } | |
3161 | |
3162 jlong PSParallelCompact::millis_since_last_gc() { | |
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3163 // We need a monotonically non-deccreasing time in ms but |
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3164 // os::javaTimeMillis() does not guarantee monotonicity. |
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3165 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3166 jlong ret_val = now - _time_of_last_gc; |
0 | 3167 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3168 if (ret_val < 0) { | |
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3169 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3170 return 0; |
3171 } | |
3172 return ret_val; | |
3173 } | |
3174 | |
3175 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3176 // We need a monotonically non-deccreasing time in ms but |
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3177 // os::javaTimeMillis() does not guarantee monotonicity. |
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3178 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3179 } |
3180 | |
3181 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3182 { | |
3183 if (source() != destination()) { | |
495
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3184 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3185 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3186 } | |
3187 update_state(words_remaining()); | |
3188 assert(is_full(), "sanity"); | |
3189 return ParMarkBitMap::full; | |
3190 } | |
3191 | |
3192 void MoveAndUpdateClosure::copy_partial_obj() | |
3193 { | |
3194 size_t words = words_remaining(); | |
3195 | |
3196 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3197 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3198 if (end_addr < range_end) { | |
3199 words = bitmap()->obj_size(source(), end_addr); | |
3200 } | |
3201 | |
3202 // This test is necessary; if omitted, the pointer updates to a partial object | |
3203 // that crosses the dense prefix boundary could be overwritten. | |
3204 if (source() != destination()) { | |
495
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3205 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3206 Copy::aligned_conjoint_words(source(), destination(), words); |
3207 } | |
3208 update_state(words); | |
3209 } | |
3210 | |
3211 ParMarkBitMapClosure::IterationStatus | |
3212 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3213 assert(destination() != NULL, "sanity"); | |
3214 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3215 | |
3216 _source = addr; | |
3217 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3218 destination(), "wrong destination"); | |
3219 | |
3220 if (words > words_remaining()) { | |
3221 return ParMarkBitMap::would_overflow; | |
3222 } | |
3223 | |
3224 // The start_array must be updated even if the object is not moving. | |
3225 if (_start_array != NULL) { | |
3226 _start_array->allocate_block(destination()); | |
3227 } | |
3228 | |
3229 if (destination() != source()) { | |
495
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diff
changeset
|
3230 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3231 Copy::aligned_conjoint_words(source(), destination(), words); |
3232 } | |
3233 | |
3234 oop moved_oop = (oop) destination(); | |
3235 moved_oop->update_contents(compaction_manager()); | |
3236 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3237 | |
3238 update_state(words); | |
3239 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3240 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3241 } | |
3242 | |
3243 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3244 ParCompactionManager* cm, | |
3245 PSParallelCompact::SpaceId space_id) : | |
3246 ParMarkBitMapClosure(mbm, cm), | |
3247 _space_id(space_id), | |
3248 _start_array(PSParallelCompact::start_array(space_id)) | |
3249 { | |
3250 } | |
3251 | |
3252 // Updates the references in the object to their new values. | |
3253 ParMarkBitMapClosure::IterationStatus | |
3254 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3255 do_addr(addr); | |
3256 return ParMarkBitMap::incomplete; | |
3257 } |