Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 10329:10f759898d40
7186737: Unable to allocate bit maps or card tables for parallel gc for the requested heap
Summary: Print helpful error message when VM aborts due to inability of allocating bit maps or card tables
Reviewed-by: jmasa, stefank
Contributed-by: tamao <tao.mao@oracle.com>
author | tamao |
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date | Mon, 20 May 2013 10:44:33 -0700 |
parents | 001ec9515f84 |
children | 14d3f71f831d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #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 | |
375
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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 _reserved_byte_size = 0; |
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360 _region_data = 0; |
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361 _region_count = 0; |
0 | 362 } |
363 | |
364 bool ParallelCompactData::initialize(MemRegion covered_region) | |
365 { | |
366 _region_start = covered_region.start(); | |
367 const size_t region_size = covered_region.word_size(); | |
368 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
369 | |
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370 assert(region_align_down(_region_start) == _region_start, |
0 | 371 "region start not aligned"); |
375
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372 assert((region_size & RegionSizeOffsetMask) == 0, |
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373 "region size not a multiple of RegionSize"); |
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374 |
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375 bool result = initialize_region_data(region_size); |
0 | 376 |
377 return result; | |
378 } | |
379 | |
380 PSVirtualSpace* | |
381 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
382 { | |
383 const size_t raw_bytes = count * element_size; | |
384 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
385 const size_t granularity = os::vm_allocation_granularity(); | |
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386 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
0 | 387 |
388 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
389 MAX2(page_sz, granularity); | |
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390 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
0 | 391 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
392 rs.size()); | |
6197 | 393 |
394 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
395 | |
0 | 396 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
397 if (vspace != 0) { | |
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398 if (vspace->expand_by(_reserved_byte_size)) { |
0 | 399 return vspace; |
400 } | |
401 delete vspace; | |
237
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402 // Release memory reserved in the space. |
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403 rs.release(); |
0 | 404 } |
405 | |
406 return 0; | |
407 } | |
408 | |
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409 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 410 { |
375
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411 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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412 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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413 if (_region_vspace != 0) { |
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414 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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415 _region_count = count; |
0 | 416 return true; |
417 } | |
418 return false; | |
419 } | |
420 | |
421 void ParallelCompactData::clear() | |
422 { | |
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423 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 424 } |
425 | |
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426 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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427 assert(beg_region <= _region_count, "beg_region out of range"); |
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428 assert(end_region <= _region_count, "end_region out of range"); |
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429 |
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430 const size_t region_cnt = end_region - beg_region; |
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431 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 432 } |
433 | |
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434 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 435 { |
375
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436 const RegionData* cur_cp = region(region_idx); |
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437 const RegionData* const end_cp = region(region_count() - 1); |
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438 |
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439 HeapWord* result = region_to_addr(region_idx); |
0 | 440 if (cur_cp < end_cp) { |
441 do { | |
442 result += cur_cp->partial_obj_size(); | |
375
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443 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 444 } |
445 return result; | |
446 } | |
447 | |
448 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
449 { | |
450 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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451 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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452 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 453 |
454 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
455 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
456 | |
375
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457 if (beg_region == end_region) { |
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458 // All in one region. |
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459 _region_data[beg_region].add_live_obj(len); |
0 | 460 return; |
461 } | |
462 | |
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463 // First region. |
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464 const size_t beg_ofs = region_offset(addr); |
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465 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 466 |
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467 Klass* klass = ((oop)addr)->klass(); |
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468 // Middle regions--completely spanned by this object. |
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469 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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470 _region_data[region].set_partial_obj_size(RegionSize); |
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471 _region_data[region].set_partial_obj_addr(addr); |
0 | 472 } |
473 | |
375
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474 // Last region. |
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475 const size_t end_ofs = region_offset(addr + len - 1); |
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476 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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477 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 478 } |
479 | |
480 void | |
481 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
482 { | |
375
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483 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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484 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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485 |
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486 size_t cur_region = addr_to_region_idx(beg); |
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487 const size_t end_region = addr_to_region_idx(end); |
0 | 488 HeapWord* addr = beg; |
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489 while (cur_region < end_region) { |
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490 _region_data[cur_region].set_destination(addr); |
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491 _region_data[cur_region].set_destination_count(0); |
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492 _region_data[cur_region].set_source_region(cur_region); |
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493 _region_data[cur_region].set_data_location(addr); |
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494 |
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495 // Update live_obj_size so the region appears completely full. |
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496 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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497 _region_data[cur_region].set_live_obj_size(live_size); |
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498 |
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499 ++cur_region; |
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500 addr += RegionSize; |
0 | 501 } |
502 } | |
503 | |
482
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504 // Find the point at which a space can be split and, if necessary, record the |
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505 // split point. |
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506 // |
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507 // If the current src region (which overflowed the destination space) doesn't |
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508 // have a partial object, the split point is at the beginning of the current src |
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509 // region (an "easy" split, no extra bookkeeping required). |
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510 // |
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511 // If the current src region has a partial object, the split point is in the |
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512 // region where that partial object starts (call it the split_region). If |
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513 // split_region has a partial object, then the split point is just after that |
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514 // partial object (a "hard" split where we have to record the split data and |
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515 // zero the partial_obj_size field). With a "hard" split, we know that the |
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516 // partial_obj ends within split_region because the partial object that caused |
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517 // the overflow starts in split_region. If split_region doesn't have a partial |
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518 // obj, then the split is at the beginning of split_region (another "easy" |
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519 // split). |
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520 HeapWord* |
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521 ParallelCompactData::summarize_split_space(size_t src_region, |
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522 SplitInfo& split_info, |
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523 HeapWord* destination, |
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524 HeapWord* target_end, |
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525 HeapWord** target_next) |
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526 { |
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527 assert(destination <= target_end, "sanity"); |
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528 assert(destination + _region_data[src_region].data_size() > target_end, |
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529 "region should not fit into target space"); |
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530 assert(is_region_aligned(target_end), "sanity"); |
482
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531 |
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532 size_t split_region = src_region; |
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533 HeapWord* split_destination = destination; |
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534 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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535 |
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536 if (destination + partial_obj_size > target_end) { |
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537 // The split point is just after the partial object (if any) in the |
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538 // src_region that contains the start of the object that overflowed the |
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539 // destination space. |
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540 // |
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541 // Find the start of the "overflow" object and set split_region to the |
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542 // region containing it. |
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543 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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544 split_region = addr_to_region_idx(overflow_obj); |
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545 |
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546 // Clear the source_region field of all destination regions whose first word |
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547 // came from data after the split point (a non-null source_region field |
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548 // implies a region must be filled). |
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549 // |
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550 // An alternative to the simple loop below: clear during post_compact(), |
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551 // which uses memcpy instead of individual stores, and is easy to |
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552 // parallelize. (The downside is that it clears the entire RegionData |
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553 // object as opposed to just one field.) |
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554 // |
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555 // post_compact() would have to clear the summary data up to the highest |
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556 // address that was written during the summary phase, which would be |
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557 // |
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558 // max(top, max(new_top, clear_top)) |
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559 // |
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560 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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561 // to target_end. |
482
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562 const RegionData* const sr = region(split_region); |
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563 const size_t beg_idx = |
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564 addr_to_region_idx(region_align_up(sr->destination() + |
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565 sr->partial_obj_size())); |
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566 const size_t end_idx = addr_to_region_idx(target_end); |
482
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567 |
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568 if (TraceParallelOldGCSummaryPhase) { |
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569 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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570 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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571 beg_idx, end_idx); |
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572 } |
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573 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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574 _region_data[idx].set_source_region(0); |
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575 } |
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576 |
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577 // Set split_destination and partial_obj_size to reflect the split region. |
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578 split_destination = sr->destination(); |
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579 partial_obj_size = sr->partial_obj_size(); |
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580 } |
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581 |
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582 // The split is recorded only if a partial object extends onto the region. |
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583 if (partial_obj_size != 0) { |
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584 _region_data[split_region].set_partial_obj_size(0); |
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585 split_info.record(split_region, partial_obj_size, split_destination); |
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586 } |
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587 |
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588 // Setup the continuation addresses. |
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589 *target_next = split_destination + partial_obj_size; |
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590 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 591 |
592 if (TraceParallelOldGCSummaryPhase) { | |
482
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593 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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594 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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595 " pos=" SIZE_FORMAT, |
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596 split_type, source_next, split_region, |
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597 partial_obj_size); |
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598 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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599 " tn=" PTR_FORMAT, |
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600 split_type, split_destination, |
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601 addr_to_region_idx(split_destination), |
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602 *target_next); |
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603 |
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604 if (partial_obj_size != 0) { |
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605 HeapWord* const po_beg = split_info.destination(); |
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606 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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607 gclog_or_tty->print_cr("%s split: " |
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608 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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609 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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610 split_type, |
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611 po_beg, addr_to_region_idx(po_beg), |
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612 po_end, addr_to_region_idx(po_end)); |
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613 } |
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614 } |
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615 |
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616 return source_next; |
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617 } |
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618 |
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619 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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620 HeapWord* source_beg, HeapWord* source_end, |
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621 HeapWord** source_next, |
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622 HeapWord* target_beg, HeapWord* target_end, |
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623 HeapWord** target_next) |
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624 { |
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625 if (TraceParallelOldGCSummaryPhase) { |
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626 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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627 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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628 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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629 source_beg, source_end, source_next_val, |
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630 target_beg, target_end, *target_next); |
0 | 631 } |
632 | |
375
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633 size_t cur_region = addr_to_region_idx(source_beg); |
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634 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 635 |
636 HeapWord *dest_addr = target_beg; | |
375
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637 while (cur_region < end_region) { |
482
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638 // The destination must be set even if the region has no data. |
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639 _region_data[cur_region].set_destination(dest_addr); |
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640 |
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641 size_t words = _region_data[cur_region].data_size(); |
0 | 642 if (words > 0) { |
482
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643 // If cur_region does not fit entirely into the target space, find a point |
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644 // at which the source space can be 'split' so that part is copied to the |
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645 // target space and the rest is copied elsewhere. |
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646 if (dest_addr + words > target_end) { |
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647 assert(source_next != NULL, "source_next is NULL when splitting"); |
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648 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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649 target_end, target_next); |
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650 return false; |
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651 } |
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652 |
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653 // Compute the destination_count for cur_region, and if necessary, update |
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654 // source_region for a destination region. The source_region field is |
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655 // updated if cur_region is the first (left-most) region to be copied to a |
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656 // destination region. |
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657 // |
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658 // The destination_count calculation is a bit subtle. A region that has |
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659 // data that compacts into itself does not count itself as a destination. |
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660 // This maintains the invariant that a zero count means the region is |
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661 // available and can be claimed and then filled. |
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662 uint destination_count = 0; |
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663 if (split_info.is_split(cur_region)) { |
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664 // The current region has been split: the partial object will be copied |
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665 // to one destination space and the remaining data will be copied to |
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666 // another destination space. Adjust the initial destination_count and, |
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667 // if necessary, set the source_region field if the partial object will |
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668 // cross a destination region boundary. |
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669 destination_count = split_info.destination_count(); |
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670 if (destination_count == 2) { |
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671 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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672 _region_data[dest_idx].set_source_region(cur_region); |
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673 } |
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674 } |
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675 |
0 | 676 HeapWord* const last_addr = dest_addr + words - 1; |
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677 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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678 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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679 |
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680 // Initially assume that the destination regions will be the same and |
0 | 681 // adjust the value below if necessary. Under this assumption, if |
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682 // cur_region == dest_region_2, then cur_region will be compacted |
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683 // completely into itself. |
482
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684 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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685 if (dest_region_1 != dest_region_2) { |
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686 // Destination regions differ; adjust destination_count. |
0 | 687 destination_count += 1; |
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688 // Data from cur_region will be copied to the start of dest_region_2. |
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689 _region_data[dest_region_2].set_source_region(cur_region); |
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690 } else if (region_offset(dest_addr) == 0) { |
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691 // Data from cur_region will be copied to the start of the destination |
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692 // region. |
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693 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 694 } |
695 | |
375
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696 _region_data[cur_region].set_destination_count(destination_count); |
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697 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 698 dest_addr += words; |
699 } | |
700 | |
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701 ++cur_region; |
0 | 702 } |
703 | |
704 *target_next = dest_addr; | |
705 return true; | |
706 } | |
707 | |
708 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
709 assert(addr != NULL, "Should detect NULL oop earlier"); | |
710 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
711 #ifdef ASSERT | |
712 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
713 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
714 } | |
715 #endif | |
716 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
717 | |
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718 // Region covering the object. |
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719 size_t region_index = addr_to_region_idx(addr); |
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720 const RegionData* const region_ptr = region(region_index); |
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721 HeapWord* const region_addr = region_align_down(addr); |
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722 |
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723 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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724 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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725 |
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726 HeapWord* result = region_ptr->destination(); |
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727 |
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728 // If all the data in the region is live, then the new location of the object |
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729 // can be calculated from the destination of the region plus the offset of the |
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730 // object in the region. |
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731 if (region_ptr->data_size() == RegionSize) { |
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732 result += pointer_delta(addr, region_addr); |
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733 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 734 return result; |
735 } | |
736 | |
737 // The new location of the object is | |
375
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738 // region destination + |
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739 // size of the partial object extending onto the region + |
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740 // sizes of the live objects in the Region that are to the left of addr |
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741 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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742 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 743 |
744 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
745 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
746 | |
747 result += partial_obj_size + live_to_left; | |
495
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748 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 749 return result; |
750 } | |
751 | |
752 #ifdef ASSERT | |
753 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
754 { | |
755 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
756 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
757 for (const size_t* p = beg; p < end; ++p) { | |
758 assert(*p == 0, "not zero"); | |
759 } | |
760 } | |
761 | |
762 void ParallelCompactData::verify_clear() | |
763 { | |
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764 verify_clear(_region_vspace); |
0 | 765 } |
766 #endif // #ifdef ASSERT | |
767 | |
768 #ifdef NOT_PRODUCT | |
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769 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 770 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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771 return sd.region(region_index); |
0 | 772 } |
773 #endif | |
774 | |
775 elapsedTimer PSParallelCompact::_accumulated_time; | |
776 unsigned int PSParallelCompact::_total_invocations = 0; | |
777 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
778 jlong PSParallelCompact::_time_of_last_gc = 0; | |
779 CollectorCounters* PSParallelCompact::_counters = NULL; | |
780 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
781 ParallelCompactData PSParallelCompact::_summary_data; | |
782 | |
783 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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784 |
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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)) { | |
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844 vm_shutdown_during_initialization( |
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845 err_msg("Unable to allocate " SIZE_FORMAT "KB bitmaps for parallel " |
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846 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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847 _mark_bitmap.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 848 return false; |
849 } | |
850 | |
851 if (!_summary_data.initialize(mr)) { | |
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852 vm_shutdown_during_initialization( |
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853 err_msg("Unable to allocate " SIZE_FORMAT "KB card tables for parallel " |
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854 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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855 _summary_data.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 856 return false; |
857 } | |
858 | |
859 return true; | |
860 } | |
861 | |
862 void PSParallelCompact::initialize_space_info() | |
863 { | |
864 memset(&_space_info, 0, sizeof(_space_info)); | |
865 | |
866 ParallelScavengeHeap* heap = gc_heap(); | |
867 PSYoungGen* young_gen = heap->young_gen(); | |
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868 |
0 | 869 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
870 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
871 _space_info[from_space_id].set_space(young_gen->from_space()); | |
872 _space_info[to_space_id].set_space(young_gen->to_space()); | |
873 | |
874 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
875 } | |
876 | |
877 void PSParallelCompact::initialize_dead_wood_limiter() | |
878 { | |
879 const size_t max = 100; | |
880 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
881 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
882 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
883 DEBUG_ONLY(_dwl_initialized = true;) | |
884 _dwl_adjustment = normal_distribution(1.0); | |
885 } | |
886 | |
887 // Simple class for storing info about the heap at the start of GC, to be used | |
888 // after GC for comparison/printing. | |
889 class PreGCValues { | |
890 public: | |
891 PreGCValues() { } | |
892 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
893 | |
894 void fill(ParallelScavengeHeap* heap) { | |
895 _heap_used = heap->used(); | |
896 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
897 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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898 _metadata_used = MetaspaceAux::allocated_used_bytes(); |
0 | 899 }; |
900 | |
901 size_t heap_used() const { return _heap_used; } | |
902 size_t young_gen_used() const { return _young_gen_used; } | |
903 size_t old_gen_used() const { return _old_gen_used; } | |
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904 size_t metadata_used() const { return _metadata_used; } |
0 | 905 |
906 private: | |
907 size_t _heap_used; | |
908 size_t _young_gen_used; | |
909 size_t _old_gen_used; | |
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910 size_t _metadata_used; |
0 | 911 }; |
912 | |
913 void | |
914 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
915 { | |
916 // At this point, top is the value before GC, new_top() is the value that will | |
917 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
918 // should be marked above top. The summary data is cleared to the larger of | |
919 // top & new_top. | |
920 MutableSpace* const space = _space_info[id].space(); | |
921 HeapWord* const bot = space->bottom(); | |
922 HeapWord* const top = space->top(); | |
923 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
924 | |
925 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
926 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
927 _mark_bitmap.clear_range(beg_bit, end_bit); | |
928 | |
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929 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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930 const size_t end_region = |
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931 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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932 _summary_data.clear_range(beg_region, end_region); |
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933 |
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934 // Clear the data used to 'split' regions. |
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935 SplitInfo& split_info = _space_info[id].split_info(); |
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936 if (split_info.is_valid()) { |
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937 split_info.clear(); |
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938 } |
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939 DEBUG_ONLY(split_info.verify_clear();) |
0 | 940 } |
941 | |
942 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
943 { | |
944 // Update the from & to space pointers in space_info, since they are swapped | |
945 // at each young gen gc. Do the update unconditionally (even though a | |
946 // promotion failure does not swap spaces) because an unknown number of minor | |
947 // collections will have swapped the spaces an unknown number of times. | |
948 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
949 ParallelScavengeHeap* heap = gc_heap(); | |
950 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
951 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
952 | |
953 pre_gc_values->fill(heap); | |
954 | |
955 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
956 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
957 | |
958 // Increment the invocation count | |
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959 heap->increment_total_collections(true); |
0 | 960 |
961 // We need to track unique mark sweep invocations as well. | |
962 _total_invocations++; | |
963 | |
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964 heap->print_heap_before_gc(); |
0 | 965 |
966 // Fill in TLABs | |
967 heap->accumulate_statistics_all_tlabs(); | |
968 heap->ensure_parsability(true); // retire TLABs | |
969 | |
970 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
971 HandleMark hm; // Discard invalid handles created during verification | |
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972 Universe::verify(" VerifyBeforeGC:"); |
0 | 973 } |
974 | |
975 // Verify object start arrays | |
976 if (VerifyObjectStartArray && | |
977 VerifyBeforeGC) { | |
978 heap->old_gen()->verify_object_start_array(); | |
979 } | |
980 | |
981 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
982 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 983 |
984 // Have worker threads release resources the next time they run a task. | |
985 gc_task_manager()->release_all_resources(); | |
0 | 986 } |
987 | |
988 void PSParallelCompact::post_compact() | |
989 { | |
990 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
991 | |
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992 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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993 // Clear the marking bitmap, summary data and split info. |
0 | 994 clear_data_covering_space(SpaceId(id)); |
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995 // Update top(). Must be done after clearing the bitmap and summary data. |
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996 _space_info[id].publish_new_top(); |
0 | 997 } |
998 | |
999 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1000 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1001 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1002 | |
1003 ParallelScavengeHeap* heap = gc_heap(); | |
1004 bool eden_empty = eden_space->is_empty(); | |
1005 if (!eden_empty) { | |
1006 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1007 heap->young_gen(), heap->old_gen()); | |
1008 } | |
1009 | |
1010 // Update heap occupancy information which is used as input to the soft ref | |
1011 // clearing policy at the next gc. | |
1012 Universe::update_heap_info_at_gc(); | |
1013 | |
1014 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1015 to_space->is_empty(); | |
1016 | |
1017 BarrierSet* bs = heap->barrier_set(); | |
1018 if (bs->is_a(BarrierSet::ModRef)) { | |
1019 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1020 MemRegion old_mr = heap->old_gen()->reserved(); | |
1021 | |
1022 if (young_gen_empty) { | |
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1023 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1024 } else { |
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1025 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1026 } |
1027 } | |
1028 | |
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1029 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1030 ClassLoaderDataGraph::purge(); |
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1031 MetaspaceAux::verify_metrics(); |
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1032 |
0 | 1033 Threads::gc_epilogue(); |
1034 CodeCache::gc_epilogue(); | |
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1035 JvmtiExport::gc_epilogue(); |
0 | 1036 |
1037 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1038 | |
1039 ref_processor()->enqueue_discovered_references(NULL); | |
1040 | |
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1041 if (ZapUnusedHeapArea) { |
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1042 heap->gen_mangle_unused_area(); |
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1043 } |
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1044 |
0 | 1045 // Update time of last GC |
1046 reset_millis_since_last_gc(); | |
1047 } | |
1048 | |
1049 HeapWord* | |
1050 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1051 bool maximum_compaction) | |
1052 { | |
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1053 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1054 const ParallelCompactData& sd = summary_data(); |
1055 | |
1056 const MutableSpace* const space = _space_info[id].space(); | |
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1057 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1058 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1059 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1060 |
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1061 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1062 // of the dense prefix. |
1063 size_t full_count = 0; | |
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1064 const RegionData* cp; |
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1065 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1066 ++full_count; |
1067 } | |
1068 | |
1069 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1070 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1071 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1072 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1073 _maximum_compaction_gc_num = total_invocations(); | |
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1074 return sd.region_to_addr(cp); |
0 | 1075 } |
1076 | |
1077 HeapWord* const new_top = _space_info[id].new_top(); | |
1078 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1079 const size_t space_used = space->used_in_words(); | |
1080 const size_t space_capacity = space->capacity_in_words(); | |
1081 | |
1082 const double cur_density = double(space_live) / space_capacity; | |
1083 const double deadwood_density = | |
1084 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1085 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1086 | |
1087 if (TraceParallelOldGCDensePrefix) { | |
1088 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1089 cur_density, deadwood_density, deadwood_goal); | |
1090 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1091 "space_cap=" SIZE_FORMAT, | |
1092 space_live, space_used, | |
1093 space_capacity); | |
1094 } | |
1095 | |
1096 // XXX - Use binary search? | |
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1097 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1098 const RegionData* full_cp = cp; |
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1099 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1100 while (cp < end_cp) { |
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1101 HeapWord* region_destination = cp->destination(); |
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1102 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1103 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1104 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1105 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1106 sd.region(cp), region_destination, |
0 | 1107 dense_prefix, cur_deadwood); |
1108 } | |
1109 | |
1110 if (cur_deadwood >= deadwood_goal) { | |
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1111 // Found the region that has the correct amount of deadwood to the left. |
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1112 // This typically occurs after crossing a fairly sparse set of regions, so |
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1113 // iterate backwards over those sparse regions, looking for the region |
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1114 // that has the lowest density of live objects 'to the right.' |
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1115 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1116 size_t live_to_left = space_to_left - cur_deadwood; |
1117 size_t space_to_right = space_capacity - space_to_left; | |
1118 size_t live_to_right = space_live - live_to_left; | |
1119 double density_to_right = double(live_to_right) / space_to_right; | |
1120 while (cp > full_cp) { | |
1121 --cp; | |
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1122 const size_t prev_region_live_to_right = live_to_right - |
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1123 cp->data_size(); |
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1124 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1125 double prev_region_density_to_right = |
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1126 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1127 if (density_to_right <= prev_region_density_to_right) { |
0 | 1128 return dense_prefix; |
1129 } | |
1130 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1131 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1132 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1133 prev_region_density_to_right); |
0 | 1134 } |
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1135 dense_prefix -= region_size; |
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1136 live_to_right = prev_region_live_to_right; |
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1137 space_to_right = prev_region_space_to_right; |
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1138 density_to_right = prev_region_density_to_right; |
0 | 1139 } |
1140 return dense_prefix; | |
1141 } | |
1142 | |
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1143 dense_prefix += region_size; |
0 | 1144 ++cp; |
1145 } | |
1146 | |
1147 return dense_prefix; | |
1148 } | |
1149 | |
1150 #ifndef PRODUCT | |
1151 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1152 const SpaceId id, | |
1153 const bool maximum_compaction, | |
1154 HeapWord* const addr) | |
1155 { | |
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1156 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1157 RegionData* const cp = summary_data().region(region_idx); |
0 | 1158 const MutableSpace* const space = _space_info[id].space(); |
1159 HeapWord* const new_top = _space_info[id].new_top(); | |
1160 | |
1161 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1162 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1163 const size_t space_cap = space->capacity_in_words(); | |
1164 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1165 const size_t live_to_right = new_top - cp->destination(); | |
1166 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1167 | |
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1168 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1169 "spl=" SIZE_FORMAT " " |
1170 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1171 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1172 " ratio=%10.8f", | |
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1173 algorithm, addr, region_idx, |
0 | 1174 space_live, |
1175 dead_to_left, dead_to_left_pct, | |
1176 dead_to_right, live_to_right, | |
1177 double(dead_to_right) / live_to_right); | |
1178 } | |
1179 #endif // #ifndef PRODUCT | |
1180 | |
1181 // Return a fraction indicating how much of the generation can be treated as | |
1182 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1183 // based on the density of live objects in the generation to determine a limit, | |
1184 // which is then adjusted so the return value is min_percent when the density is | |
1185 // 1. | |
1186 // | |
1187 // The following table shows some return values for a different values of the | |
1188 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1189 // min_percent is 1. | |
1190 // | |
1191 // fraction allowed as dead wood | |
1192 // ----------------------------------------------------------------- | |
1193 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1194 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1195 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1196 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1197 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1198 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1199 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1200 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1201 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1202 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1203 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1204 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1205 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1206 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1207 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1208 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1209 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1210 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1211 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1212 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1213 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1214 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1215 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1216 | |
1217 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1218 { | |
1219 assert(_dwl_initialized, "uninitialized"); | |
1220 | |
1221 // The raw limit is the value of the normal distribution at x = density. | |
1222 const double raw_limit = normal_distribution(density); | |
1223 | |
1224 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1225 // | |
1226 // First subtract the adjustment value (which is simply the precomputed value | |
1227 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1228 // Then add the minimum value, so the minimum is returned when the density is | |
1229 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1230 const double min = double(min_percent) / 100.0; | |
1231 const double limit = raw_limit - _dwl_adjustment + min; | |
1232 return MAX2(limit, 0.0); | |
1233 } | |
1234 | |
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1235 ParallelCompactData::RegionData* |
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1236 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1237 const RegionData* end) |
0 | 1238 { |
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1239 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1240 ParallelCompactData& sd = summary_data(); |
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1241 size_t left = sd.region(beg); |
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1242 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1243 |
1244 // Binary search. | |
1245 while (left < right) { | |
1246 // Equivalent to (left + right) / 2, but does not overflow. | |
1247 const size_t middle = left + (right - left) / 2; | |
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1248 RegionData* const middle_ptr = sd.region(middle); |
0 | 1249 HeapWord* const dest = middle_ptr->destination(); |
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1250 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1251 assert(dest != NULL, "sanity"); |
1252 assert(dest <= addr, "must move left"); | |
1253 | |
1254 if (middle > left && dest < addr) { | |
1255 right = middle - 1; | |
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1256 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1257 left = middle + 1; |
1258 } else { | |
1259 return middle_ptr; | |
1260 } | |
1261 } | |
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1262 return sd.region(left); |
0 | 1263 } |
1264 | |
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1265 ParallelCompactData::RegionData* |
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1266 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1267 const RegionData* end, |
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1268 size_t dead_words) |
0 | 1269 { |
1270 ParallelCompactData& sd = summary_data(); | |
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1271 size_t left = sd.region(beg); |
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1272 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1273 |
1274 // Binary search. | |
1275 while (left < right) { | |
1276 // Equivalent to (left + right) / 2, but does not overflow. | |
1277 const size_t middle = left + (right - left) / 2; | |
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1278 RegionData* const middle_ptr = sd.region(middle); |
0 | 1279 HeapWord* const dest = middle_ptr->destination(); |
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1280 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1281 assert(dest != NULL, "sanity"); |
1282 assert(dest <= addr, "must move left"); | |
1283 | |
1284 const size_t dead_to_left = pointer_delta(addr, dest); | |
1285 if (middle > left && dead_to_left > dead_words) { | |
1286 right = middle - 1; | |
1287 } else if (middle < right && dead_to_left < dead_words) { | |
1288 left = middle + 1; | |
1289 } else { | |
1290 return middle_ptr; | |
1291 } | |
1292 } | |
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1293 return sd.region(left); |
0 | 1294 } |
1295 | |
1296 // The result is valid during the summary phase, after the initial summarization | |
1297 // of each space into itself, and before final summarization. | |
1298 inline double | |
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1299 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1300 HeapWord* const bottom, |
1301 HeapWord* const top, | |
1302 HeapWord* const new_top) | |
1303 { | |
1304 ParallelCompactData& sd = summary_data(); | |
1305 | |
1306 assert(cp != NULL, "sanity"); | |
1307 assert(bottom != NULL, "sanity"); | |
1308 assert(top != NULL, "sanity"); | |
1309 assert(new_top != NULL, "sanity"); | |
1310 assert(top >= new_top, "summary data problem?"); | |
1311 assert(new_top > bottom, "space is empty; should not be here"); | |
1312 assert(new_top >= cp->destination(), "sanity"); | |
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1313 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1314 |
1315 HeapWord* const destination = cp->destination(); | |
1316 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1317 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1318 const size_t compacted_region_used = pointer_delta(top, |
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1319 sd.region_to_addr(cp)); |
0 | 1320 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1321 | |
1322 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1323 return double(reclaimable) / divisor; | |
1324 } | |
1325 | |
1326 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1327 // compacted region. The address is always on a region boundary. |
0 | 1328 // |
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1329 // Completely full regions at the left are skipped, since no compaction can |
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1330 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1331 // computed, based on the density (amount live / capacity) of the generation; |
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1332 // the region with approximately that amount of dead space to the left is |
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1333 // identified as the limit region. Regions between the last completely full |
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1334 // region and the limit region are scanned and the one that has the best |
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1335 // (maximum) reclaimed_ratio() is selected. |
0 | 1336 HeapWord* |
1337 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1338 bool maximum_compaction) | |
1339 { | |
483
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1340 if (ParallelOldGCSplitALot) { |
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1341 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1342 // The value was chosen to provoke splitting a young gen space; use it. |
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1343 return _space_info[id].dense_prefix(); |
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1344 } |
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1345 } |
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1346 |
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1347 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1348 const ParallelCompactData& sd = summary_data(); |
1349 | |
1350 const MutableSpace* const space = _space_info[id].space(); | |
1351 HeapWord* const top = space->top(); | |
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1352 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1353 HeapWord* const new_top = _space_info[id].new_top(); |
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1354 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1355 HeapWord* const bottom = space->bottom(); |
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1356 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1357 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1358 const RegionData* const new_top_cp = |
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1359 sd.addr_to_region_ptr(new_top_aligned_up); |
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1360 |
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1361 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1362 // of the dense prefix. |
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1363 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1364 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1365 space->is_empty(), "no dead space allowed to the left"); |
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1366 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1367 "region must have dead space"); |
0 | 1368 |
1369 // The gc number is saved whenever a maximum compaction is done, and used to | |
1370 // determine when the maximum compaction interval has expired. This avoids | |
1371 // successive max compactions for different reasons. | |
1372 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1373 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1374 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1375 total_invocations() == HeapFirstMaximumCompactionCount; | |
1376 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1377 _maximum_compaction_gc_num = total_invocations(); | |
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1378 return sd.region_to_addr(full_cp); |
0 | 1379 } |
1380 | |
1381 const size_t space_live = pointer_delta(new_top, bottom); | |
1382 const size_t space_used = space->used_in_words(); | |
1383 const size_t space_capacity = space->capacity_in_words(); | |
1384 | |
1385 const double density = double(space_live) / double(space_capacity); | |
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1386 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1387 const double limiter = dead_wood_limiter(density, min_percent_free); |
1388 const size_t dead_wood_max = space_used - space_live; | |
1389 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1390 dead_wood_max); | |
1391 | |
1392 if (TraceParallelOldGCDensePrefix) { | |
1393 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1394 "space_cap=" SIZE_FORMAT, | |
1395 space_live, space_used, | |
1396 space_capacity); | |
1397 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1398 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1399 density, min_percent_free, limiter, | |
1400 dead_wood_max, dead_wood_limit); | |
1401 } | |
1402 | |
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1403 // Locate the region with the desired amount of dead space to the left. |
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1404 const RegionData* const limit_cp = |
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1405 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1406 |
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1407 // Scan from the first region with dead space to the limit region and find the |
0 | 1408 // one with the best (largest) reclaimed ratio. |
1409 double best_ratio = 0.0; | |
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1410 const RegionData* best_cp = full_cp; |
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1411 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1412 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1413 if (tmp_ratio > best_ratio) { | |
1414 best_cp = cp; | |
1415 best_ratio = tmp_ratio; | |
1416 } | |
1417 } | |
1418 | |
1419 #if 0 | |
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1420 // Something to consider: if the region with the best ratio is 'close to' the |
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1421 // first region w/free space, choose the first region with free space |
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1422 // ("first-free"). The first-free region is usually near the start of the |
0 | 1423 // heap, which means we are copying most of the heap already, so copy a bit |
1424 // more to get complete compaction. | |
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1425 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1426 _maximum_compaction_gc_num = total_invocations(); |
1427 best_cp = full_cp; | |
1428 } | |
1429 #endif // #if 0 | |
1430 | |
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1431 return sd.region_to_addr(best_cp); |
0 | 1432 } |
1433 | |
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1434 #ifndef PRODUCT |
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1435 void |
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1436 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1437 size_t words) |
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1438 { |
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1439 if (TraceParallelOldGCSummaryPhase) { |
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1440 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1441 SIZE_FORMAT, start, start + words, words); |
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1442 } |
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1443 |
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1444 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1445 CollectedHeap::fill_with_objects(start, words); |
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1446 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1447 _mark_bitmap.mark_obj(p, words); |
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1448 _summary_data.add_obj(p, words); |
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1449 start_array->allocate_block(p); |
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1450 } |
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1451 } |
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1452 |
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1453 void |
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1454 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1455 { |
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1456 ParallelCompactData& sd = summary_data(); |
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1457 MutableSpace* space = _space_info[id].space(); |
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1458 |
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1459 // Find the source and destination start addresses. |
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1460 HeapWord* const src_addr = sd.region_align_down(start); |
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1461 HeapWord* dst_addr; |
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1462 if (src_addr < start) { |
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1463 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1464 } else if (src_addr > space->bottom()) { |
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1465 // The start (the original top() value) is aligned to a region boundary so |
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1466 // the associated region does not have a destination. Compute the |
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1467 // destination from the previous region. |
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1468 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1469 dst_addr = cp->destination() + cp->data_size(); |
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1470 } else { |
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1471 // Filling the entire space. |
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1472 dst_addr = space->bottom(); |
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1473 } |
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1474 assert(dst_addr != NULL, "sanity"); |
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1475 |
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1476 // Update the summary data. |
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1477 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1478 src_addr, space->top(), NULL, |
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1479 dst_addr, space->end(), |
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1480 _space_info[id].new_top_addr()); |
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1481 assert(result, "should not fail: bad filler object size"); |
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1482 } |
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1483 |
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1484 void |
496
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1485 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1486 { |
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1487 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1488 return; |
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1489 } |
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1490 |
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1491 MutableSpace* const space = _space_info[id].space(); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1492 if (space->is_empty()) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1493 HeapWord* b = space->bottom(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1494 HeapWord* t = b + space->capacity_in_words() / 2; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1495 space->set_top(t); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1496 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1497 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1498 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1499 |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1489
diff
changeset
|
1500 size_t min_size = CollectedHeap::min_fill_size(); |
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1489
diff
changeset
|
1501 size_t obj_len = min_size; |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1502 while (b + obj_len <= t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1503 CollectedHeap::fill_with_object(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1504 mark_bitmap()->mark_obj(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1505 summary_data().add_obj(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1506 b += obj_len; |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1489
diff
changeset
|
1507 obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ... |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1508 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1509 if (b < t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1510 // The loop didn't completely fill to t (top); adjust top downward. |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1511 space->set_top(b); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1512 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1513 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1514 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1515 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1516 |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1517 HeapWord** nta = _space_info[id].new_top_addr(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1518 bool result = summary_data().summarize(_space_info[id].split_info(), |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1519 space->bottom(), space->top(), NULL, |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1520 space->bottom(), space->end(), nta); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1521 assert(result, "space must fit into itself"); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1522 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1523 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1524 |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1525 void |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1526 PSParallelCompact::provoke_split(bool & max_compaction) |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1527 { |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1528 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1529 return; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1530 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1531 |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1532 const size_t region_size = ParallelCompactData::RegionSize; |
0f773163217d
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parents:
482
diff
changeset
|
1533 ParallelCompactData& sd = summary_data(); |
0f773163217d
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jcoomes
parents:
482
diff
changeset
|
1534 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1535 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1536 MutableSpace* const from_space = _space_info[from_space_id].space(); |
0f773163217d
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jcoomes
parents:
482
diff
changeset
|
1537 const size_t eden_live = pointer_delta(eden_space->top(), |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1538 _space_info[eden_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1539 const size_t from_live = pointer_delta(from_space->top(), |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1540 _space_info[from_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1541 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1542 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1543 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
0f773163217d
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jcoomes
parents:
482
diff
changeset
|
1544 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
0f773163217d
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jcoomes
parents:
482
diff
changeset
|
1545 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1546 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1547 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1548 // Choose the space to split; need at least 2 regions live (or fillable). |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1549 SpaceId id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1550 MutableSpace* space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1551 size_t live_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1552 size_t fill_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1553 if (eden_live + eden_fillable >= region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1554 id = eden_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1555 space = eden_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1556 live_words = eden_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1557 fill_words = eden_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1558 } else if (from_live + from_fillable >= region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1559 id = from_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1560 space = from_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1561 live_words = from_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1562 fill_words = from_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1563 } else { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1564 return; // Give up. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1565 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1566 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1567 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1568 if (live_words < region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1569 // Fill from top() to end() w/live objects of mixed sizes. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1570 HeapWord* const fill_start = space->top(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1571 live_words += fill_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1572 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1573 space->set_top(fill_start + fill_words); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1574 if (ZapUnusedHeapArea) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1575 space->set_top_for_allocations(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1576 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1577 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1578 HeapWord* cur_addr = fill_start; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1579 while (fill_words > 0) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1580 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1581 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1582 if (fill_words - cur_size < min_fill_size) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1583 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1584 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1585 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1586 CollectedHeap::fill_with_object(cur_addr, cur_size); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1587 mark_bitmap()->mark_obj(cur_addr, cur_size); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1588 sd.add_obj(cur_addr, cur_size); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1589 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1590 cur_addr += cur_size; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1591 fill_words -= cur_size; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1592 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1593 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1594 summarize_new_objects(id, fill_start); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1595 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1596 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1597 max_compaction = false; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1598 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1599 // Manipulate the old gen so that it has room for about half of the live data |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1600 // in the target young gen space (live_words / 2). |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1601 id = old_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1602 space = _space_info[id].space(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1603 const size_t free_at_end = space->free_in_words(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1604 const size_t free_target = align_object_size(live_words / 2); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1605 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1606 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1607 if (free_at_end >= free_target + min_fill_size) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1608 // Fill space above top() and set the dense prefix so everything survives. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1609 HeapWord* const fill_start = space->top(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1610 const size_t fill_size = free_at_end - free_target; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1611 space->set_top(space->top() + fill_size); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1612 if (ZapUnusedHeapArea) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1613 space->set_top_for_allocations(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1614 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1615 fill_with_live_objects(id, fill_start, fill_size); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1616 summarize_new_objects(id, fill_start); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
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|
1617 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1618 } else if (dead + free_at_end > free_target) { |
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1619 // Find a dense prefix that makes the right amount of space available. |
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1620 HeapWord* cur = sd.region_align_down(space->top()); |
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1621 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1622 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1623 while (dead_to_right < free_target) { |
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1624 cur -= region_size; |
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1625 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1626 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1627 } |
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1628 _space_info[id].set_dense_prefix(cur); |
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1629 } |
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1630 } |
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1631 #endif // #ifndef PRODUCT |
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1632 |
0 | 1633 void PSParallelCompact::summarize_spaces_quick() |
1634 { | |
1635 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1636 const MutableSpace* space = _space_info[i].space(); | |
482
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1637 HeapWord** nta = _space_info[i].new_top_addr(); |
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1638 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1639 space->bottom(), space->top(), NULL, |
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1640 space->bottom(), space->end(), nta); |
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1641 assert(result, "space must fit into itself"); |
0 | 1642 _space_info[i].set_dense_prefix(space->bottom()); |
1643 } | |
496
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1644 |
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1645 #ifndef PRODUCT |
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1646 if (ParallelOldGCSplitALot) { |
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1647 provoke_split_fill_survivor(to_space_id); |
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1648 } |
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1649 #endif // #ifndef PRODUCT |
0 | 1650 } |
1651 | |
1652 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1653 { | |
1654 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1655 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1656 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
375
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1657 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1658 // Only enough dead space is filled so that any remaining dead space to the |
1659 // left is larger than the minimum filler object. (The remainder is filled | |
1660 // during the copy/update phase.) | |
1661 // | |
1662 // The size of the dead space to the right of the boundary is not a | |
1663 // concern, since compaction will be able to use whatever space is | |
1664 // available. | |
1665 // | |
1666 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1667 // surrounds the space to be filled with an object. | |
1668 // | |
1669 // In the 32-bit VM, each bit represents two 32-bit words: | |
1670 // +---+ | |
1671 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1672 // end_bits: ... x x x | 0 | || 0 x x ... | |
1673 // +---+ | |
1674 // | |
1675 // In the 64-bit VM, each bit represents one 64-bit word: | |
1676 // +------------+ | |
1677 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1678 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1679 // +------------+ | |
1680 // +-------+ | |
1681 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1682 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1683 // +-------+ | |
1684 // +-----------+ | |
1685 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1686 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1687 // +-----------+ | |
1688 // +-------+ | |
1689 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1690 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1691 // +-------+ | |
1692 | |
1693 // Initially assume case a, c or e will apply. | |
1571
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1694 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1695 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1696 | |
1697 #ifdef _LP64 | |
1571
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1698 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1699 // Cases a, c or e. |
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1700 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1701 // Case b above. |
1702 obj_beg = dense_prefix_end - 1; | |
1703 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1704 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1705 // Case d above. | |
1706 obj_beg = dense_prefix_end - 3; | |
1707 obj_len = 3; | |
1708 } | |
1709 #endif // #ifdef _LP64 | |
1710 | |
482
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1711 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1712 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1713 _summary_data.add_obj(obj_beg, obj_len); | |
1714 assert(start_array(id) != NULL, "sanity"); | |
1715 start_array(id)->allocate_block(obj_beg); | |
1716 } | |
1717 } | |
1718 | |
1719 void | |
482
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1720 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1721 { |
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1722 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1723 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1724 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1725 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1726 cur->set_source_region(0); |
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1727 } |
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1728 } |
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1729 |
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1730 void |
0 | 1731 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1732 { | |
1733 assert(id < last_space_id, "id out of range"); | |
483
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1734 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1735 ParallelOldGCSplitALot && id == old_space_id, |
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1736 "should have been reset in summarize_spaces_quick()"); |
0 | 1737 |
1738 const MutableSpace* space = _space_info[id].space(); | |
265
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1739 if (_space_info[id].new_top() != space->bottom()) { |
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1740 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1741 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1742 |
1743 #ifndef PRODUCT | |
265
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1744 if (TraceParallelOldGCDensePrefix) { |
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1745 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1746 dense_prefix_end); |
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1747 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1748 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1749 } |
0 | 1750 #endif // #ifndef PRODUCT |
1751 | |
483
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1752 // Recompute the summary data, taking into account the dense prefix. If |
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1753 // every last byte will be reclaimed, then the existing summary data which |
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1754 // compacts everything can be left in place. |
265
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1755 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1756 // If dead space crosses the dense prefix boundary, it is (at least |
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1757 // partially) filled with a dummy object, marked live and added to the |
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1758 // summary data. This simplifies the copy/update phase and must be done |
483
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1759 // before the final locations of objects are determined, to prevent |
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1760 // leaving a fragment of dead space that is too small to fill. |
265
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1761 fill_dense_prefix_end(id); |
482
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1762 |
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1763 // Compute the destination of each Region, and thus each object. |
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1764 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1765 _summary_data.summarize(_space_info[id].split_info(), |
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1766 dense_prefix_end, space->top(), NULL, |
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1767 dense_prefix_end, space->end(), |
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1768 _space_info[id].new_top_addr()); |
265
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1769 } |
0 | 1770 } |
1771 | |
1772 if (TraceParallelOldGCSummaryPhase) { | |
375
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1773 const size_t region_size = ParallelCompactData::RegionSize; |
265
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1774 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
375
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1775 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1776 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1777 HeapWord* const new_top = _space_info[id].new_top(); |
375
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1778 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1779 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1780 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
375
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1781 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1782 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1783 id, space->capacity_in_words(), dense_prefix_end, | |
375
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1784 dp_region, dp_words / region_size, |
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1785 cr_words / region_size, new_top); |
0 | 1786 } |
1787 } | |
1788 | |
482
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1789 #ifndef PRODUCT |
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1790 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1791 HeapWord* dst_beg, HeapWord* dst_end, |
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1792 SpaceId src_space_id, |
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1793 HeapWord* src_beg, HeapWord* src_end) |
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1794 { |
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1795 if (TraceParallelOldGCSummaryPhase) { |
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1796 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1797 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1798 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1799 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1800 SIZE_FORMAT "-" SIZE_FORMAT, |
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1801 src_space_id, space_names[src_space_id], |
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1802 dst_space_id, space_names[dst_space_id], |
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1803 src_beg, src_end, |
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1804 _summary_data.addr_to_region_idx(src_beg), |
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1805 _summary_data.addr_to_region_idx(src_end), |
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1806 dst_beg, dst_end, |
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1807 _summary_data.addr_to_region_idx(dst_beg), |
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1808 _summary_data.addr_to_region_idx(dst_end)); |
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1809 } |
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1810 } |
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1811 #endif // #ifndef PRODUCT |
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1812 |
0 | 1813 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1814 bool maximum_compaction) | |
1815 { | |
1816 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1817 // trace("2"); | |
1818 | |
1819 #ifdef ASSERT | |
1820 if (TraceParallelOldGCMarkingPhase) { | |
1821 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1822 "add_obj_bytes=" SIZE_FORMAT, | |
1823 add_obj_count, add_obj_size * HeapWordSize); | |
1824 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1825 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1826 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1827 } | |
1828 #endif // #ifdef ASSERT | |
1829 | |
1830 // Quick summarization of each space into itself, to see how much is live. | |
1831 summarize_spaces_quick(); | |
1832 | |
1833 if (TraceParallelOldGCSummaryPhase) { | |
1834 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1835 Universe::print(); | |
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1836 NOT_PRODUCT(print_region_ranges()); |
0 | 1837 if (Verbose) { |
1838 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1839 } | |
1840 } | |
1841 | |
1842 // The amount of live data that will end up in old space (assuming it fits). | |
1843 size_t old_space_total_live = 0; | |
482
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1844 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1845 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1846 _space_info[id].space()->bottom()); | |
1847 } | |
1848 | |
482
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1849 MutableSpace* const old_space = _space_info[old_space_id].space(); |
483
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1850 const size_t old_capacity = old_space->capacity_in_words(); |
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1851 if (old_space_total_live > old_capacity) { |
0 | 1852 // XXX - should also try to expand |
1853 maximum_compaction = true; | |
1854 } | |
483
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1855 #ifndef PRODUCT |
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1856 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1857 provoke_split(maximum_compaction); |
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1858 } |
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1859 #endif // #ifndef PRODUCT |
0 | 1860 |
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1861 // Old generations. |
0 | 1862 summarize_space(old_space_id, maximum_compaction); |
1863 | |
482
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1864 // Summarize the remaining spaces in the young gen. The initial target space |
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1865 // is the old gen. If a space does not fit entirely into the target, then the |
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1866 // remainder is compacted into the space itself and that space becomes the new |
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1867 // target. |
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1868 SpaceId dst_space_id = old_space_id; |
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1869 HeapWord* dst_space_end = old_space->end(); |
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1870 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1871 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1872 const MutableSpace* space = _space_info[id].space(); |
1873 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1874 space->bottom()); | |
482
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1875 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1876 |
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1877 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1878 SpaceId(id), space->bottom(), space->top());) |
266
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1879 if (live > 0 && live <= available) { |
0 | 1880 // All the live data will fit. |
482
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1881 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1882 space->bottom(), space->top(), |
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1883 NULL, |
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1884 *new_top_addr, dst_space_end, |
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1885 new_top_addr); |
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1886 assert(done, "space must fit into old gen"); |
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1887 |
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1888 // Reset the new_top value for the space. |
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1889 _space_info[id].set_new_top(space->bottom()); |
482
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1890 } else if (live > 0) { |
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1891 // Attempt to fit part of the source space into the target space. |
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1892 HeapWord* next_src_addr = NULL; |
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1893 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1894 space->bottom(), space->top(), |
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1895 &next_src_addr, |
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1896 *new_top_addr, dst_space_end, |
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1897 new_top_addr); |
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1898 assert(!done, "space should not fit into old gen"); |
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1899 assert(next_src_addr != NULL, "sanity"); |
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1900 |
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1901 // The source space becomes the new target, so the remainder is compacted |
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1902 // within the space itself. |
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1903 dst_space_id = SpaceId(id); |
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1904 dst_space_end = space->end(); |
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1905 new_top_addr = _space_info[id].new_top_addr(); |
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1906 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1907 space->bottom(), dst_space_end, |
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1908 SpaceId(id), next_src_addr, space->top());) |
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1909 done = _summary_data.summarize(_space_info[id].split_info(), |
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1910 next_src_addr, space->top(), |
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1911 NULL, |
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1912 space->bottom(), dst_space_end, |
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1913 new_top_addr); |
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1914 assert(done, "space must fit when compacted into itself"); |
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1915 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1916 } |
1917 } | |
1918 | |
1919 if (TraceParallelOldGCSummaryPhase) { | |
1920 tty->print_cr("summary_phase: after final summarization"); | |
1921 Universe::print(); | |
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1922 NOT_PRODUCT(print_region_ranges()); |
0 | 1923 if (Verbose) { |
1924 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1925 } | |
1926 } | |
1927 } | |
1928 | |
1929 // This method should contain all heap-specific policy for invoking a full | |
1930 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1931 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1932 // before full gc, or any other specialized behavior, it needs to be added here. | |
1933 // | |
1934 // Note that this method should only be called from the vm_thread while at a | |
1935 // safepoint. | |
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1936 // |
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1937 // Note that the all_soft_refs_clear flag in the collector policy |
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1938 // may be true because this method can be called without intervening |
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1939 // activity. For example when the heap space is tight and full measure |
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1940 // are being taken to free space. |
0 | 1941 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1942 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1943 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1944 "should be in vm thread"); | |
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1945 |
0 | 1946 ParallelScavengeHeap* heap = gc_heap(); |
1947 GCCause::Cause gc_cause = heap->gc_cause(); | |
1948 assert(!heap->is_gc_active(), "not reentrant"); | |
1949 | |
1950 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1951 IsGCActiveMark mark; |
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1952 |
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1953 if (ScavengeBeforeFullGC) { |
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1954 PSScavenge::invoke_no_policy(); |
0 | 1955 } |
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1956 |
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1957 const bool clear_all_soft_refs = |
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1958 heap->collector_policy()->should_clear_all_soft_refs(); |
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1959 |
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1960 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1961 maximum_heap_compaction); |
0 | 1962 } |
1963 | |
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1964 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1965 size_t addr_region_index = addr_to_region_idx(addr); |
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1966 return region_index == addr_region_index; |
0 | 1967 } |
1968 | |
1969 // This method contains no policy. You should probably | |
1970 // be calling invoke() instead. | |
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1971 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 1972 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
1973 assert(ref_processor() != NULL, "Sanity"); | |
1974 | |
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1975 if (GC_locker::check_active_before_gc()) { |
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1976 return false; |
0 | 1977 } |
1978 | |
1979 TimeStamp marking_start; | |
1980 TimeStamp compaction_start; | |
1981 TimeStamp collection_exit; | |
1982 | |
1983 ParallelScavengeHeap* heap = gc_heap(); | |
1984 GCCause::Cause gc_cause = heap->gc_cause(); | |
1985 PSYoungGen* young_gen = heap->young_gen(); | |
1986 PSOldGen* old_gen = heap->old_gen(); | |
1987 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
1988 | |
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1989 // The scope of casr should end after code that can change |
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1990 // CollectorPolicy::_should_clear_all_soft_refs. |
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1991 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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1992 heap->collector_policy()); |
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1993 |
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1994 if (ZapUnusedHeapArea) { |
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1995 // Save information needed to minimize mangling |
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1996 heap->record_gen_tops_before_GC(); |
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1997 } |
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1998 |
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1999 heap->pre_full_gc_dump(); |
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2000 |
0 | 2001 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2002 | |
2003 // Make sure data structures are sane, make the heap parsable, and do other | |
2004 // miscellaneous bookkeeping. | |
2005 PreGCValues pre_gc_values; | |
2006 pre_compact(&pre_gc_values); | |
2007 | |
210 | 2008 // Get the compaction manager reserved for the VM thread. |
2009 ParCompactionManager* const vmthread_cm = | |
2010 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2011 | |
0 | 2012 // Place after pre_compact() where the number of invocations is incremented. |
2013 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2014 | |
2015 { | |
2016 ResourceMark rm; | |
2017 HandleMark hm; | |
2018 | |
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2019 // Set the number of GC threads to be used in this collection |
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2020 gc_task_manager()->set_active_gang(); |
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2021 gc_task_manager()->task_idle_workers(); |
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2022 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2023 |
0 | 2024 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2025 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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2026 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 2027 TraceCollectorStats tcs(counters()); |
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2028 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2029 |
2030 if (TraceGen1Time) accumulated_time()->start(); | |
2031 | |
2032 // Let the size policy know we're starting | |
2033 size_policy->major_collection_begin(); | |
2034 | |
2035 CodeCache::gc_prologue(); | |
2036 Threads::gc_prologue(); | |
2037 | |
2038 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2039 | |
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2040 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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2041 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2042 |
2043 bool marked_for_unloading = false; | |
2044 | |
2045 marking_start.update(); | |
210 | 2046 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2047 |
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2048 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2049 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2050 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2051 |
2052 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2053 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2054 | |
2055 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2056 // needed by the compaction for filling holes in the dense prefix. | |
2057 adjust_roots(); | |
2058 | |
2059 compaction_start.update(); | |
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2060 compact(); |
0 | 2061 |
2062 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2063 // done before resizing. | |
2064 post_compact(); | |
2065 | |
2066 // Let the size policy know we're done | |
2067 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2068 | |
2069 if (UseAdaptiveSizePolicy) { | |
2070 if (PrintAdaptiveSizePolicy) { | |
2071 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2072 gclog_or_tty->stamp(); | |
2073 gclog_or_tty->print_cr(" collection: %d ", | |
2074 heap->total_collections()); | |
2075 if (Verbose) { | |
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2076 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2077 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2078 } |
2079 } | |
2080 | |
2081 // Don't check if the size_policy is ready here. Let | |
2082 // the size_policy check that internally. | |
2083 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2084 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2085 UseAdaptiveSizePolicyWithSystemGC)) { | |
2086 // Calculate optimal free space amounts | |
2087 assert(young_gen->max_size() > | |
2088 young_gen->from_space()->capacity_in_bytes() + | |
2089 young_gen->to_space()->capacity_in_bytes(), | |
2090 "Sizes of space in young gen are out-of-bounds"); | |
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2091 |
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2092 size_t young_live = young_gen->used_in_bytes(); |
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2093 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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2094 size_t old_live = old_gen->used_in_bytes(); |
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2095 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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2096 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 2097 size_t max_eden_size = young_gen->max_size() - |
2098 young_gen->from_space()->capacity_in_bytes() - | |
2099 young_gen->to_space()->capacity_in_bytes(); | |
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2100 |
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2101 // Used for diagnostics |
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2102 size_policy->clear_generation_free_space_flags(); |
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2103 |
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2104 size_policy->compute_generation_free_space(young_live, |
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2105 eden_live, |
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2106 old_live, |
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2107 cur_eden, |
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2108 max_old_gen_size, |
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2109 max_eden_size, |
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2110 true /* full gc*/); |
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2111 |
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2112 size_policy->check_gc_overhead_limit(young_live, |
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2113 eden_live, |
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2114 max_old_gen_size, |
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2115 max_eden_size, |
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2116 true /* full gc*/, |
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2117 gc_cause, |
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2118 heap->collector_policy()); |
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2119 |
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2120 size_policy->decay_supplemental_growth(true /* full gc*/); |
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2121 |
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2122 heap->resize_old_gen( |
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2123 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2124 |
2125 // Don't resize the young generation at an major collection. A | |
2126 // desired young generation size may have been calculated but | |
2127 // resizing the young generation complicates the code because the | |
2128 // resizing of the old generation may have moved the boundary | |
2129 // between the young generation and the old generation. Let the | |
2130 // young generation resizing happen at the minor collections. | |
2131 } | |
2132 if (PrintAdaptiveSizePolicy) { | |
2133 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2134 heap->total_collections()); | |
2135 } | |
2136 } | |
2137 | |
2138 if (UsePerfData) { | |
2139 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2140 counters->update_counters(); | |
2141 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2142 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2143 } | |
2144 | |
2145 heap->resize_all_tlabs(); | |
2146 | |
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2147 // Resize the metaspace capactiy after a collection |
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2148 MetaspaceGC::compute_new_size(); |
0 | 2149 |
2150 if (TraceGen1Time) accumulated_time()->stop(); | |
2151 | |
2152 if (PrintGC) { | |
2153 if (PrintGCDetails) { | |
2154 // No GC timestamp here. This is after GC so it would be confusing. | |
2155 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2156 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2157 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2158 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2159 } else { |
2160 heap->print_heap_change(pre_gc_values.heap_used()); | |
2161 } | |
2162 } | |
2163 | |
2164 // Track memory usage and detect low memory | |
2165 MemoryService::track_memory_usage(); | |
2166 heap->update_counters(); | |
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2167 gc_task_manager()->release_idle_workers(); |
0 | 2168 } |
2169 | |
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2170 #ifdef ASSERT |
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2171 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2172 ParCompactionManager* const cm = |
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2173 ParCompactionManager::manager_array(int(i)); |
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2174 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2175 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
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2176 } |
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2177 #endif // ASSERT |
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2178 |
0 | 2179 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2180 HandleMark hm; // Discard invalid handles created during verification | |
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2181 Universe::verify(" VerifyAfterGC:"); |
0 | 2182 } |
2183 | |
2184 // Re-verify object start arrays | |
2185 if (VerifyObjectStartArray && | |
2186 VerifyAfterGC) { | |
2187 old_gen->verify_object_start_array(); | |
2188 } | |
2189 | |
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2190 if (ZapUnusedHeapArea) { |
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2191 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2192 } |
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2193 |
0 | 2194 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2195 | |
2196 collection_exit.update(); | |
2197 | |
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2198 heap->print_heap_after_gc(); |
0 | 2199 if (PrintGCTaskTimeStamps) { |
2200 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2201 INT64_FORMAT, | |
2202 marking_start.ticks(), compaction_start.ticks(), | |
2203 collection_exit.ticks()); | |
2204 gc_task_manager()->print_task_time_stamps(); | |
2205 } | |
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2206 |
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2207 heap->post_full_gc_dump(); |
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2208 |
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2209 #ifdef TRACESPINNING |
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2210 ParallelTaskTerminator::print_termination_counts(); |
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2211 #endif |
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2212 |
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2213 return true; |
0 | 2214 } |
2215 | |
2216 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2217 PSYoungGen* young_gen, | |
2218 PSOldGen* old_gen) { | |
2219 MutableSpace* const eden_space = young_gen->eden_space(); | |
2220 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2221 assert(young_gen->virtual_space()->alignment() == | |
2222 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2223 | |
2224 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2225 return false; | |
2226 } | |
2227 | |
2228 // Both generations must be completely committed. | |
2229 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2230 return false; | |
2231 } | |
2232 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2233 return false; | |
2234 } | |
2235 | |
2236 // Figure out how much to take from eden. Include the average amount promoted | |
2237 // in the total; otherwise the next young gen GC will simply bail out to a | |
2238 // full GC. | |
2239 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2240 const size_t eden_used = eden_space->used_in_bytes(); | |
2241 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2242 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2243 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2244 | |
2245 if (absorb_size >= eden_capacity) { | |
2246 return false; // Must leave some space in eden. | |
2247 } | |
2248 | |
2249 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2250 if (new_young_size < young_gen->min_gen_size()) { | |
2251 return false; // Respect young gen minimum size. | |
2252 } | |
2253 | |
2254 if (TraceAdaptiveGCBoundary && Verbose) { | |
2255 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2256 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2257 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2258 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2259 absorb_size / K, | |
2260 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2261 young_gen->from_space()->used_in_bytes() / K, | |
2262 young_gen->to_space()->used_in_bytes() / K, | |
2263 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2264 } | |
2265 | |
2266 // Fill the unused part of the old gen. | |
2267 MutableSpace* const old_space = old_gen->object_space(); | |
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2268 HeapWord* const unused_start = old_space->top(); |
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2269 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2270 |
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2271 if (unused_words > 0) { |
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2272 if (unused_words < CollectedHeap::min_fill_size()) { |
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2273 return false; // If the old gen cannot be filled, must give up. |
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2274 } |
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2275 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2276 } |
2277 | |
2278 // Take the live data from eden and set both top and end in the old gen to | |
2279 // eden top. (Need to set end because reset_after_change() mangles the region | |
2280 // from end to virtual_space->high() in debug builds). | |
2281 HeapWord* const new_top = eden_space->top(); | |
2282 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2283 absorb_size); | |
2284 young_gen->reset_after_change(); | |
2285 old_space->set_top(new_top); | |
2286 old_space->set_end(new_top); | |
2287 old_gen->reset_after_change(); | |
2288 | |
2289 // Update the object start array for the filler object and the data from eden. | |
2290 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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2291 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2292 start_array->allocate_block(p); |
0 | 2293 } |
2294 | |
2295 // Could update the promoted average here, but it is not typically updated at | |
2296 // full GCs and the value to use is unclear. Something like | |
2297 // | |
2298 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2299 | |
2300 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2301 return true; | |
2302 } | |
2303 | |
2304 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2305 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2306 "shouldn't return NULL"); | |
2307 return ParallelScavengeHeap::gc_task_manager(); | |
2308 } | |
2309 | |
2310 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2311 bool maximum_heap_compaction) { | |
2312 // Recursively traverse all live objects and mark them | |
2313 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2314 | |
2315 ParallelScavengeHeap* heap = gc_heap(); | |
2316 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2317 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2318 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2319 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2320 |
2321 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2322 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2323 | |
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2324 // Need new claim bits before marking starts. |
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2325 ClassLoaderDataGraph::clear_claimed_marks(); |
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2326 |
0 | 2327 { |
2328 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
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2329 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2330 |
2331 GCTaskQueue* q = GCTaskQueue::create(); | |
2332 | |
2333 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2334 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2335 // We scan the thread roots in parallel | |
2336 Threads::create_thread_roots_marking_tasks(q); | |
2337 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2338 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2339 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2340 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2341 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2342 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2343 |
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2344 if (active_gc_threads > 1) { |
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2345 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2346 q->enqueue(new StealMarkingTask(&terminator)); |
2347 } | |
2348 } | |
2349 | |
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2350 gc_task_manager()->execute_and_wait(q); |
0 | 2351 } |
2352 | |
2353 // Process reference objects found during marking | |
2354 { | |
2355 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2356 if (ref_processor()->processing_is_mt()) { | |
2357 RefProcTaskExecutor task_executor; | |
2358 ref_processor()->process_discovered_references( | |
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2359 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2360 &task_executor); |
0 | 2361 } else { |
2362 ref_processor()->process_discovered_references( | |
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2363 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2364 } |
2365 } | |
2366 | |
2367 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
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2368 |
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2369 // This is the point where the entire marking should have completed. |
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2370 assert(cm->marking_stacks_empty(), "Marking should have completed"); |
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2371 |
0 | 2372 // Follow system dictionary roots and unload classes. |
2373 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2374 | |
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2375 // Unload nmethods. |
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2376 CodeCache::do_unloading(is_alive_closure(), purged_class); |
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2377 |
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2378 // Prune dead klasses from subklass/sibling/implementor lists. |
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2379 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2380 |
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2381 // Delete entries for dead interned strings. |
0 | 2382 StringTable::unlink(is_alive_closure()); |
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2383 |
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2384 // Clean up unreferenced symbols in symbol table. |
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2385 SymbolTable::unlink(); |
0 | 2386 } |
2387 | |
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2388 void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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2389 ClassLoaderData* cld = klass->class_loader_data(); |
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2390 // The actual processing of the klass is done when we |
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2391 // traverse the list of Klasses in the class loader data. |
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2392 PSParallelCompact::follow_class_loader(cm, cld); |
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2393 } |
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2394 |
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2395 void PSParallelCompact::adjust_klass(ParCompactionManager* cm, Klass* klass) { |
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2396 ClassLoaderData* cld = klass->class_loader_data(); |
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2397 // The actual processing of the klass is done when we |
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2398 // traverse the list of Klasses in the class loader data. |
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2399 PSParallelCompact::adjust_class_loader(cm, cld); |
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2400 } |
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2401 |
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2402 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2403 ClassLoaderData* cld) { |
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2404 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2405 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2406 |
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2407 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2408 } |
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2409 |
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2410 void PSParallelCompact::adjust_class_loader(ParCompactionManager* cm, |
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2411 ClassLoaderData* cld) { |
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2412 cld->oops_do(PSParallelCompact::adjust_pointer_closure(), |
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2413 PSParallelCompact::adjust_klass_closure(), |
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2414 true); |
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2415 } |
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2416 |
0 | 2417 // This should be moved to the shared markSweep code! |
2418 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2419 public: | |
2420 bool do_object_b(oop p) { return true; } | |
2421 }; | |
2422 static PSAlwaysTrueClosure always_true; | |
2423 | |
2424 void PSParallelCompact::adjust_roots() { | |
2425 // Adjust the pointers to reflect the new locations | |
2426 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2427 | |
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2428 // Need new claim bits when tracing through and adjusting pointers. |
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2429 ClassLoaderDataGraph::clear_claimed_marks(); |
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2430 |
0 | 2431 // General strong roots. |
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2432 Universe::oops_do(adjust_pointer_closure()); |
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2433 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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2434 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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2435 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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2436 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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2437 FlatProfiler::oops_do(adjust_pointer_closure()); |
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2438 Management::oops_do(adjust_pointer_closure()); |
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2439 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 2440 // SO_AllClasses |
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2441 SystemDictionary::oops_do(adjust_pointer_closure()); |
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2442 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 2443 |
2444 // Now adjust pointers in remaining weak roots. (All of which should | |
2445 // have been cleared if they pointed to non-surviving objects.) | |
2446 // Global (weak) JNI handles | |
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2447 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 2448 |
2449 CodeCache::oops_do(adjust_pointer_closure()); | |
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2450 StringTable::oops_do(adjust_pointer_closure()); |
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2451 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2452 // Roots were visited so references into the young gen in roots |
2453 // may have been scanned. Process them also. | |
2454 // Should the reference processor have a span that excludes | |
2455 // young gen objects? | |
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2456 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2457 } |
2458 | |
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2459 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2460 uint parallel_gc_threads) |
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2461 { |
0 | 2462 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2463 | |
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2464 // Find the threads that are active |
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2465 unsigned int which = 0; |
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2466 |
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2467 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2468 for (uint j = 0; j < task_count; j++) { |
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2469 q->enqueue(new DrainStacksCompactionTask(j)); |
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2470 ParCompactionManager::verify_region_list_empty(j); |
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2471 // Set the region stacks variables to "no" region stack values |
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2472 // so that they will be recognized and needing a region stack |
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2473 // in the stealing tasks if they do not get one by executing |
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2474 // a draining stack. |
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2475 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2476 cm->set_region_stack(NULL); |
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2477 cm->set_region_stack_index((uint)max_uintx); |
0 | 2478 } |
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2479 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2480 |
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2481 // Find all regions that are available (can be filled immediately) and |
0 | 2482 // distribute them to the thread stacks. The iteration is done in reverse |
375
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2483 // order (high to low) so the regions will be removed in ascending order. |
0 | 2484 |
2485 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2486 | |
375
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2487 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2488 // A region index which corresponds to the tasks created above. |
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2489 // "which" must be 0 <= which < task_count |
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2490 |
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2491 which = 0; |
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2492 // id + 1 is used to test termination so unsigned can |
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2493 // be used with an old_space_id == 0. |
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2494 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2495 SpaceInfo* const space_info = _space_info + id; |
2496 MutableSpace* const space = space_info->space(); | |
2497 HeapWord* const new_top = space_info->new_top(); | |
2498 | |
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2499 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2500 const size_t end_region = |
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2501 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2502 |
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2503 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
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2504 if (sd.region(cur)->claim_unsafe()) { |
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2505 ParCompactionManager::region_list_push(which, cur); |
0 | 2506 |
2507 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2508 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2509 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
264
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2510 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2511 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2512 } | |
2513 | |
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2514 NOT_PRODUCT(++fillable_regions;) |
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2515 |
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2516 // Assign regions to tasks in round-robin fashion. |
0 | 2517 if (++which == task_count) { |
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2518 assert(which <= parallel_gc_threads, |
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2519 "Inconsistent number of workers"); |
0 | 2520 which = 0; |
2521 } | |
2522 } | |
2523 } | |
2524 } | |
2525 | |
2526 if (TraceParallelOldGCCompactionPhase) { | |
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2527 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2528 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2529 } |
2530 } | |
2531 | |
2532 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2533 | |
2534 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2535 uint parallel_gc_threads) { | |
2536 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2537 | |
2538 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2539 | |
2540 // Iterate over all the spaces adding tasks for updating | |
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2541 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2542 // will work on opening the gaps and the remaining gc threads |
2543 // will work on the dense prefix. | |
482
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2544 unsigned int space_id; |
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2545 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2546 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2547 const MutableSpace* const space = _space_info[space_id].space(); | |
2548 | |
2549 if (dense_prefix_end == space->bottom()) { | |
2550 // There is no dense prefix for this space. | |
2551 continue; | |
2552 } | |
2553 | |
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2554 // The dense prefix is before this region. |
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2555 size_t region_index_end_dense_prefix = |
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2556 sd.addr_to_region_idx(dense_prefix_end); |
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2557 RegionData* const dense_prefix_cp = |
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2558 sd.region(region_index_end_dense_prefix); |
0 | 2559 assert(dense_prefix_end == space->end() || |
2560 dense_prefix_cp->available() || | |
2561 dense_prefix_cp->claimed(), | |
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2562 "The region after the dense prefix should always be ready to fill"); |
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2563 |
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2564 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2565 |
2566 // Is there dense prefix work? | |
375
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2567 size_t total_dense_prefix_regions = |
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2568 region_index_end_dense_prefix - region_index_start; |
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2569 // How many regions of the dense prefix should be given to |
0 | 2570 // each thread? |
375
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2571 if (total_dense_prefix_regions > 0) { |
0 | 2572 uint tasks_for_dense_prefix = 1; |
3251
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2573 if (total_dense_prefix_regions <= |
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2574 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2575 // Don't over partition. This assumes that |
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2576 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2577 // so there are not many regions to process. |
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2578 tasks_for_dense_prefix = parallel_gc_threads; |
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2579 } else { |
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2580 // Over partition |
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2581 tasks_for_dense_prefix = parallel_gc_threads * |
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2582 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2583 } |
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2584 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2585 tasks_for_dense_prefix; |
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2586 // Give each thread at least 1 region. |
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2587 if (regions_per_thread == 0) { |
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2588 regions_per_thread = 1; |
0 | 2589 } |
2590 | |
2591 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2592 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2593 break; |
2594 } | |
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2595 // region_index_end is not processed |
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2596 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2597 region_index_end_dense_prefix); |
482
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2598 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2599 region_index_start, |
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2600 region_index_end)); |
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2601 region_index_start = region_index_end; |
0 | 2602 } |
2603 } | |
2604 // This gets any part of the dense prefix that did not | |
2605 // fit evenly. | |
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2606 if (region_index_start < region_index_end_dense_prefix) { |
482
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2607 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2608 region_index_start, |
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2609 region_index_end_dense_prefix)); |
0 | 2610 } |
482
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2611 } |
0 | 2612 } |
2613 | |
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2614 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2615 GCTaskQueue* q, |
2616 ParallelTaskTerminator* terminator_ptr, | |
2617 uint parallel_gc_threads) { | |
2618 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2619 | |
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2620 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2621 // other threads. |
2622 if (parallel_gc_threads > 1) { | |
2623 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2624 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2625 } |
2626 } | |
2627 } | |
2628 | |
2629 void PSParallelCompact::compact() { | |
2630 // trace("5"); | |
2631 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2632 | |
2633 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2634 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2635 PSOldGen* old_gen = heap->old_gen(); | |
2636 old_gen->start_array()->reset(); | |
2637 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2638 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2639 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2640 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2641 |
2642 GCTaskQueue* q = GCTaskQueue::create(); | |
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2643 enqueue_region_draining_tasks(q, active_gc_threads); |
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2644 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2645 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2646 |
2647 { | |
2648 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2649 | |
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2650 gc_task_manager()->execute_and_wait(q); |
0 | 2651 |
2652 #ifdef ASSERT | |
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2653 // Verify that all regions have been processed before the deferred updates. |
0 | 2654 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2655 verify_complete(SpaceId(id)); | |
2656 } | |
2657 #endif | |
2658 } | |
2659 | |
2660 { | |
2661 // Update the deferred objects, if any. Any compaction manager can be used. | |
2662 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2663 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2664 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2665 update_deferred_objects(cm, SpaceId(id)); | |
2666 } | |
2667 } | |
2668 } | |
2669 | |
2670 #ifdef ASSERT | |
2671 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2672 // All Regions between space bottom() to new_top() should be marked as filled |
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2673 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2674 // should have been emptied). |
2675 ParallelCompactData& sd = summary_data(); | |
2676 SpaceInfo si = _space_info[space_id]; | |
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2677 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2678 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2679 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2680 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2681 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2682 |
2683 bool issued_a_warning = false; | |
2684 | |
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2685 size_t cur_region; |
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2686 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2687 const RegionData* const c = sd.region(cur_region); |
0 | 2688 if (!c->completed()) { |
375
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2689 warning("region " SIZE_FORMAT " not filled: " |
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 | |
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2696 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2697 const RegionData* const c = sd.region(cur_region); |
0 | 2698 if (!c->available()) { |
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2699 warning("region " SIZE_FORMAT " not empty: " |
0 | 2700 "destination_count=" SIZE_FORMAT, |
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2701 cur_region, c->destination_count()); |
0 | 2702 issued_a_warning = true; |
2703 } | |
2704 } | |
2705 | |
2706 if (issued_a_warning) { | |
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2707 print_region_ranges(); |
0 | 2708 } |
2709 } | |
2710 #endif // #ifdef ASSERT | |
2711 | |
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2712 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2713 void |
2714 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2715 SpaceId space_id, | |
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2716 size_t beg_region, |
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2717 size_t end_region) { |
0 | 2718 ParallelCompactData& sd = summary_data(); |
2719 ParMarkBitMap* const mbm = mark_bitmap(); | |
2720 | |
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2721 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2722 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2723 assert(beg_region <= end_region, "bad region range"); |
0 | 2724 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2725 | |
2726 #ifdef ASSERT | |
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2727 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2728 // filled. |
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2729 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2730 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2731 } |
2732 #endif // #ifdef ASSERT | |
2733 | |
2734 if (beg_addr != space(space_id)->bottom()) { | |
2735 // Find the first live object or block of dead space that *starts* in this | |
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2736 // range of regions. If a partial object crosses onto the region, skip it; |
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2737 // it will be marked for 'deferred update' when the object head is |
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2738 // processed. If dead space crosses onto the region, it is also skipped; it |
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2739 // will be filled when the prior region is processed. If neither of those |
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2740 // apply, the first word in the region is the start of a live object or dead |
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2741 // space. |
0 | 2742 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2743 const RegionData* const cp = sd.region(beg_region); |
0 | 2744 if (cp->partial_obj_size() != 0) { |
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2745 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2746 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2747 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2748 } | |
2749 } | |
2750 | |
2751 if (beg_addr < end_addr) { | |
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2752 // A live object or block of dead space starts in this range of Regions. |
0 | 2753 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2754 | |
2755 // Create closures and iterate. | |
2756 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2757 FillClosure fill_closure(cm, space_id); | |
2758 ParMarkBitMap::IterationStatus status; | |
2759 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2760 dense_prefix_end); | |
2761 if (status == ParMarkBitMap::incomplete) { | |
2762 update_closure.do_addr(update_closure.source()); | |
2763 } | |
2764 } | |
2765 | |
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2766 // Mark the regions as filled. |
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2767 RegionData* const beg_cp = sd.region(beg_region); |
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2768 RegionData* const end_cp = sd.region(end_region); |
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2769 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2770 cp->set_completed(); |
2771 } | |
2772 } | |
2773 | |
2774 // Return the SpaceId for the space containing addr. If addr is not in the | |
2775 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2776 // in the heap and asserts such. | |
2777 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2778 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2779 | |
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2780 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2781 if (_space_info[id].space()->contains(addr)) { |
2782 return SpaceId(id); | |
2783 } | |
2784 } | |
2785 | |
2786 assert(false, "no space contains the addr"); | |
2787 return last_space_id; | |
2788 } | |
2789 | |
2790 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2791 SpaceId id) { | |
2792 assert(id < last_space_id, "bad space id"); | |
2793 | |
2794 ParallelCompactData& sd = summary_data(); | |
2795 const SpaceInfo* const space_info = _space_info + id; | |
2796 ObjectStartArray* const start_array = space_info->start_array(); | |
2797 | |
2798 const MutableSpace* const space = space_info->space(); | |
2799 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2800 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2801 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2802 |
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2803 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2804 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2805 const RegionData* cur_region; |
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2806 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2807 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2808 if (addr != NULL) { |
2809 if (start_array != NULL) { | |
2810 start_array->allocate_block(addr); | |
2811 } | |
2812 oop(addr)->update_contents(cm); | |
2813 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2814 } | |
2815 } | |
2816 } | |
2817 | |
2818 // Skip over count live words starting from beg, and return the address of the | |
2819 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2820 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2821 // an object, or account for those live words in some other way. Callers must | |
2822 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2823 HeapWord* | |
2824 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2825 { | |
2826 assert(count > 0, "sanity"); | |
2827 | |
2828 ParMarkBitMap* m = mark_bitmap(); | |
2829 idx_t bits_to_skip = m->words_to_bits(count); | |
2830 idx_t cur_beg = m->addr_to_bit(beg); | |
2831 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2832 | |
2833 do { | |
2834 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2835 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2836 const size_t obj_bits = cur_end - cur_beg + 1; | |
2837 if (obj_bits > bits_to_skip) { | |
2838 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2839 } | |
2840 bits_to_skip -= obj_bits; | |
2841 cur_beg = cur_end + 1; | |
2842 } while (bits_to_skip > 0); | |
2843 | |
2844 // Skipping the desired number of words landed just past the end of an object. | |
2845 // Find the start of the next object. | |
2846 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2847 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2848 return m->bit_to_addr(cur_beg); | |
2849 } | |
2850 | |
482
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2851 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2852 SpaceId src_space_id, |
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2853 size_t src_region_idx) |
0 | 2854 { |
482
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2855 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2856 |
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2857 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2858 if (split_info.dest_region_addr() == dest_addr) { |
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2859 // The partial object ending at the split point contains the first word to |
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2860 // be copied to dest_addr. |
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2861 return split_info.first_src_addr(); |
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2862 } |
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2863 |
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2864 const ParallelCompactData& sd = summary_data(); |
0 | 2865 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2866 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2867 |
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2868 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2869 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2870 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2871 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2872 |
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2873 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2874 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2875 |
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2876 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2877 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2878 |
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2879 HeapWord* addr = src_region_beg; |
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2880 if (dest_addr == src_region_destination) { |
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2881 // Return the first live word in the source region. |
0 | 2882 if (partial_obj_size == 0) { |
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2883 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2884 assert(addr < src_region_end, "no objects start in src region"); |
0 | 2885 } |
2886 return addr; | |
2887 } | |
2888 | |
2889 // Must skip some live data. | |
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2890 size_t words_to_skip = dest_addr - src_region_destination; |
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2891 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 2892 |
2893 if (partial_obj_size >= words_to_skip) { | |
2894 // All the live words to skip are part of the partial object. | |
2895 addr += words_to_skip; | |
2896 if (partial_obj_size == words_to_skip) { | |
2897 // Find the first live word past the partial object. | |
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2898 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2899 assert(addr < src_region_end, "wrong src region"); |
0 | 2900 } |
2901 return addr; | |
2902 } | |
2903 | |
2904 // Skip over the partial object (if any). | |
2905 if (partial_obj_size != 0) { | |
2906 words_to_skip -= partial_obj_size; | |
2907 addr += partial_obj_size; | |
2908 } | |
2909 | |
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2910 // Skip over live words due to objects that start in the region. |
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2911 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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2912 assert(addr < src_region_end, "wrong src region"); |
0 | 2913 return addr; |
2914 } | |
2915 | |
2916 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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2917 SpaceId src_space_id, |
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2918 size_t beg_region, |
0 | 2919 HeapWord* end_addr) |
2920 { | |
2921 ParallelCompactData& sd = summary_data(); | |
495
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2922 |
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2923 #ifdef ASSERT |
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2924 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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2925 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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2926 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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2927 "src_space_id does not match beg_addr"); |
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2928 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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2929 "src_space_id does not match end_addr"); |
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2930 #endif // #ifdef ASSERT |
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2931 |
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2932 RegionData* const beg = sd.region(beg_region); |
495
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2933 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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2934 |
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2935 // Regions up to new_top() are enqueued if they become available. |
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2936 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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2937 RegionData* const enqueue_end = |
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2938 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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2939 |
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2940 for (RegionData* cur = beg; cur < end; ++cur) { |
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2941 assert(cur->data_size() > 0, "region must have live data"); |
0 | 2942 cur->decrement_destination_count(); |
495
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2943 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 2944 cm->push_region(sd.region(cur)); |
0 | 2945 } |
2946 } | |
2947 } | |
2948 | |
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2949 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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2950 SpaceId& src_space_id, |
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2951 HeapWord*& src_space_top, |
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2952 HeapWord* end_addr) |
0 | 2953 { |
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2954 typedef ParallelCompactData::RegionData RegionData; |
0 | 2955 |
2956 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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2957 const size_t region_size = ParallelCompactData::RegionSize; |
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2958 |
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2959 size_t src_region_idx = 0; |
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2960 |
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2961 // Skip empty regions (if any) up to the top of the space. |
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2962 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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2963 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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2964 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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2965 const RegionData* const top_region_ptr = |
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2966 sd.addr_to_region_ptr(top_aligned_up); |
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2967 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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2968 ++src_region_ptr; |
0 | 2969 } |
2970 | |
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2971 if (src_region_ptr < top_region_ptr) { |
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2972 // The next source region is in the current space. Update src_region_idx |
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2973 // and the source address to match src_region_ptr. |
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2974 src_region_idx = sd.region(src_region_ptr); |
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2975 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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2976 if (src_region_addr > closure.source()) { |
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2977 closure.set_source(src_region_addr); |
0 | 2978 } |
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2979 return src_region_idx; |
0 | 2980 } |
2981 | |
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2982 // Switch to a new source space and find the first non-empty region. |
0 | 2983 unsigned int space_id = src_space_id + 1; |
2984 assert(space_id < last_space_id, "not enough spaces"); | |
2985 | |
2986 HeapWord* const destination = closure.destination(); | |
2987 | |
2988 do { | |
2989 MutableSpace* space = _space_info[space_id].space(); | |
2990 HeapWord* const bottom = space->bottom(); | |
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2991 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 2992 |
2993 // Iterate over the spaces that do not compact into themselves. | |
2994 if (bottom_cp->destination() != bottom) { | |
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2995 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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2996 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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2997 |
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2998 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 2999 if (src_cp->live_obj_size() > 0) { |
3000 // Found it. | |
3001 assert(src_cp->destination() == destination, | |
3002 "first live obj in the space must match the destination"); | |
3003 assert(src_cp->partial_obj_size() == 0, | |
3004 "a space cannot begin with a partial obj"); | |
3005 | |
3006 src_space_id = SpaceId(space_id); | |
3007 src_space_top = space->top(); | |
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3008 const size_t src_region_idx = sd.region(src_cp); |
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3009 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3010 return src_region_idx; |
0 | 3011 } else { |
3012 assert(src_cp->data_size() == 0, "sanity"); | |
3013 } | |
3014 } | |
3015 } | |
3016 } while (++space_id < last_space_id); | |
3017 | |
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3018 assert(false, "no source region was found"); |
0 | 3019 return 0; |
3020 } | |
3021 | |
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3022 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3023 { |
3024 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
375
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3025 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3026 ParMarkBitMap* const bitmap = mark_bitmap(); |
3027 ParallelCompactData& sd = summary_data(); | |
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3028 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3029 |
3030 // Get the items needed to construct the closure. | |
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3031 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3032 SpaceId dest_space_id = space_id(dest_addr); |
3033 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3034 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3035 assert(dest_addr < new_top, "sanity"); | |
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3036 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3037 |
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3038 // Get the source region and related info. |
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3039 size_t src_region_idx = region_ptr->source_region(); |
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3040 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3041 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3042 | |
3043 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3044 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
375
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3045 |
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3046 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3047 // destination count is not decremented when a region is copied to itself). |
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3048 if (src_region_idx == region_idx) { |
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3049 src_region_idx += 1; |
0 | 3050 } |
3051 | |
3052 if (bitmap->is_unmarked(closure.source())) { | |
3053 // The first source word is in the middle of an object; copy the remainder | |
3054 // of the object or as much as will fit. The fact that pointer updates were | |
3055 // deferred will be noted when the object header is processed. | |
3056 HeapWord* const old_src_addr = closure.source(); | |
3057 closure.copy_partial_obj(); | |
3058 if (closure.is_full()) { | |
495
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3059 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3060 closure.source()); |
375
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3061 region_ptr->set_deferred_obj_addr(NULL); |
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3062 region_ptr->set_completed(); |
0 | 3063 return; |
3064 } | |
3065 | |
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3066 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3067 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3068 // The partial object was copied from more than one source region. |
495
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3069 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3070 |
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3071 // Move to the next source region, possibly switching spaces as well. All |
0 | 3072 // args except end_addr may be modified. |
375
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3073 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3074 end_addr); |
0 | 3075 } |
3076 } | |
3077 | |
3078 do { | |
3079 HeapWord* const cur_addr = closure.source(); | |
375
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3080 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3081 src_space_top); |
3082 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3083 | |
3084 if (status == ParMarkBitMap::incomplete) { | |
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3085 // The last obj that starts in the source region does not end in the |
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3086 // region. |
1489
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3087 assert(closure.source() < end_addr, "sanity"); |
0 | 3088 HeapWord* const obj_beg = closure.source(); |
3089 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3090 src_space_top); | |
3091 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3092 if (obj_end < range_end) { | |
3093 // The end was found; the entire object will fit. | |
3094 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3095 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3096 } else { | |
3097 // The end was not found; the object will not fit. | |
3098 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3099 status = ParMarkBitMap::would_overflow; | |
3100 } | |
3101 } | |
3102 | |
3103 if (status == ParMarkBitMap::would_overflow) { | |
3104 // The last object did not fit. Note that interior oop updates were | |
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3105 // deferred, then copy enough of the object to fill the region. |
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3106 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3107 status = closure.copy_until_full(); // copies from closure.source() |
3108 | |
495
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3109 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3110 closure.source()); |
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3111 region_ptr->set_completed(); |
0 | 3112 return; |
3113 } | |
3114 | |
3115 if (status == ParMarkBitMap::full) { | |
495
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3116 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3117 closure.source()); |
375
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3118 region_ptr->set_deferred_obj_addr(NULL); |
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3119 region_ptr->set_completed(); |
0 | 3120 return; |
3121 } | |
3122 | |
495
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3123 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3124 |
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3125 // Move to the next source region, possibly switching spaces as well. All |
0 | 3126 // args except end_addr may be modified. |
375
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3127 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3128 end_addr); |
0 | 3129 } while (true); |
3130 } | |
3131 | |
3132 void | |
3133 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3134 const MutableSpace* sp = space(space_id); | |
3135 if (sp->is_empty()) { | |
3136 return; | |
3137 } | |
3138 | |
3139 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3140 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3141 HeapWord* const dp_addr = dense_prefix(space_id); | |
3142 HeapWord* beg_addr = sp->bottom(); | |
3143 HeapWord* end_addr = sp->top(); | |
3144 | |
3145 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3146 | |
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3147 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3148 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3149 if (beg_region < dp_region) { |
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3150 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3151 } |
3152 | |
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3153 // The destination of the first live object that starts in the region is one |
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3154 // past the end of the partial object entering the region (if any). |
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3155 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3156 HeapWord* const new_top = _space_info[space_id].new_top(); |
3157 assert(new_top >= dest_addr, "bad new_top value"); | |
3158 const size_t words = pointer_delta(new_top, dest_addr); | |
3159 | |
3160 if (words > 0) { | |
3161 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3162 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3163 | |
3164 ParMarkBitMap::IterationStatus status; | |
3165 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3166 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3167 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3168 "live objects skipped because closure is full"); | |
3169 } | |
3170 } | |
3171 | |
3172 jlong PSParallelCompact::millis_since_last_gc() { | |
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3173 // We need a monotonically non-deccreasing time in ms but |
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3174 // os::javaTimeMillis() does not guarantee monotonicity. |
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3175 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3176 jlong ret_val = now - _time_of_last_gc; |
0 | 3177 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3178 if (ret_val < 0) { | |
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3179 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3180 return 0; |
3181 } | |
3182 return ret_val; | |
3183 } | |
3184 | |
3185 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3186 // We need a monotonically non-deccreasing time in ms but |
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3187 // os::javaTimeMillis() does not guarantee monotonicity. |
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3188 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3189 } |
3190 | |
3191 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3192 { | |
3193 if (source() != destination()) { | |
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3194 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3195 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3196 } | |
3197 update_state(words_remaining()); | |
3198 assert(is_full(), "sanity"); | |
3199 return ParMarkBitMap::full; | |
3200 } | |
3201 | |
3202 void MoveAndUpdateClosure::copy_partial_obj() | |
3203 { | |
3204 size_t words = words_remaining(); | |
3205 | |
3206 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3207 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3208 if (end_addr < range_end) { | |
3209 words = bitmap()->obj_size(source(), end_addr); | |
3210 } | |
3211 | |
3212 // This test is necessary; if omitted, the pointer updates to a partial object | |
3213 // that crosses the dense prefix boundary could be overwritten. | |
3214 if (source() != destination()) { | |
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3215 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3216 Copy::aligned_conjoint_words(source(), destination(), words); |
3217 } | |
3218 update_state(words); | |
3219 } | |
3220 | |
3221 ParMarkBitMapClosure::IterationStatus | |
3222 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3223 assert(destination() != NULL, "sanity"); | |
3224 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3225 | |
3226 _source = addr; | |
3227 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3228 destination(), "wrong destination"); | |
3229 | |
3230 if (words > words_remaining()) { | |
3231 return ParMarkBitMap::would_overflow; | |
3232 } | |
3233 | |
3234 // The start_array must be updated even if the object is not moving. | |
3235 if (_start_array != NULL) { | |
3236 _start_array->allocate_block(destination()); | |
3237 } | |
3238 | |
3239 if (destination() != source()) { | |
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3240 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3241 Copy::aligned_conjoint_words(source(), destination(), words); |
3242 } | |
3243 | |
3244 oop moved_oop = (oop) destination(); | |
3245 moved_oop->update_contents(compaction_manager()); | |
3246 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3247 | |
3248 update_state(words); | |
3249 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3250 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3251 } | |
3252 | |
3253 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3254 ParCompactionManager* cm, | |
3255 PSParallelCompact::SpaceId space_id) : | |
3256 ParMarkBitMapClosure(mbm, cm), | |
3257 _space_id(space_id), | |
3258 _start_array(PSParallelCompact::start_array(space_id)) | |
3259 { | |
3260 } | |
3261 | |
3262 // Updates the references in the object to their new values. | |
3263 ParMarkBitMapClosure::IterationStatus | |
3264 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3265 do_addr(addr); | |
3266 return ParMarkBitMap::incomplete; | |
3267 } |