Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | 7848fc12602b |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2014, 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/parallelScavengeHeap.inline.hpp" | |
31 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" | |
34 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
35 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
36 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
37 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
38 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
39 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
40 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
10405 | 41 #include "gc_implementation/shared/gcHeapSummary.hpp" |
42 #include "gc_implementation/shared/gcTimer.hpp" | |
43 #include "gc_implementation/shared/gcTrace.hpp" | |
44 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 45 #include "gc_implementation/shared/isGCActiveMark.hpp" |
46 #include "gc_interface/gcCause.hpp" | |
47 #include "memory/gcLocker.inline.hpp" | |
48 #include "memory/referencePolicy.hpp" | |
49 #include "memory/referenceProcessor.hpp" | |
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50 #include "oops/methodData.hpp" |
1972 | 51 #include "oops/oop.inline.hpp" |
52 #include "oops/oop.pcgc.inline.hpp" | |
53 #include "runtime/fprofiler.hpp" | |
54 #include "runtime/safepoint.hpp" | |
55 #include "runtime/vmThread.hpp" | |
56 #include "services/management.hpp" | |
57 #include "services/memoryService.hpp" | |
6197 | 58 #include "services/memTracker.hpp" |
1972 | 59 #include "utilities/events.hpp" |
60 #include "utilities/stack.inline.hpp" | |
0 | 61 |
62 #include <math.h> | |
63 | |
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64 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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65 |
0 | 66 // All sizes are in HeapWords. |
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67 const size_t ParallelCompactData::Log2RegionSize = 16; // 64K words |
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68 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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69 const size_t ParallelCompactData::RegionSizeBytes = |
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70 RegionSize << LogHeapWordSize; |
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71 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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72 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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73 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
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74 |
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75 const size_t ParallelCompactData::Log2BlockSize = 7; // 128 words |
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76 const size_t ParallelCompactData::BlockSize = (size_t)1 << Log2BlockSize; |
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77 const size_t ParallelCompactData::BlockSizeBytes = |
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78 BlockSize << LogHeapWordSize; |
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79 const size_t ParallelCompactData::BlockSizeOffsetMask = BlockSize - 1; |
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80 const size_t ParallelCompactData::BlockAddrOffsetMask = BlockSizeBytes - 1; |
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81 const size_t ParallelCompactData::BlockAddrMask = ~BlockAddrOffsetMask; |
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82 |
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83 const size_t ParallelCompactData::BlocksPerRegion = RegionSize / BlockSize; |
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84 const size_t ParallelCompactData::Log2BlocksPerRegion = |
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85 Log2RegionSize - Log2BlockSize; |
0 | 86 |
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87 const ParallelCompactData::RegionData::region_sz_t |
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88 ParallelCompactData::RegionData::dc_shift = 27; |
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89 |
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90 const ParallelCompactData::RegionData::region_sz_t |
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91 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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92 |
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93 const ParallelCompactData::RegionData::region_sz_t |
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94 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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95 |
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96 const ParallelCompactData::RegionData::region_sz_t |
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97 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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98 |
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99 const ParallelCompactData::RegionData::region_sz_t |
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100 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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101 |
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102 const ParallelCompactData::RegionData::region_sz_t |
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103 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 104 |
105 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
106 bool PSParallelCompact::_print_phases = false; | |
107 | |
108 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
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109 Klass* PSParallelCompact::_updated_int_array_klass_obj = NULL; |
0 | 110 |
111 double PSParallelCompact::_dwl_mean; | |
112 double PSParallelCompact::_dwl_std_dev; | |
113 double PSParallelCompact::_dwl_first_term; | |
114 double PSParallelCompact::_dwl_adjustment; | |
115 #ifdef ASSERT | |
116 bool PSParallelCompact::_dwl_initialized = false; | |
117 #endif // #ifdef ASSERT | |
118 | |
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119 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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120 HeapWord* destination) |
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121 { |
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122 assert(src_region_idx != 0, "invalid src_region_idx"); |
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123 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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124 assert(destination != NULL, "invalid destination argument"); |
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125 |
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126 _src_region_idx = src_region_idx; |
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127 _partial_obj_size = partial_obj_size; |
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128 _destination = destination; |
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129 |
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130 // These fields may not be updated below, so make sure they're clear. |
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131 assert(_dest_region_addr == NULL, "should have been cleared"); |
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132 assert(_first_src_addr == NULL, "should have been cleared"); |
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133 |
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134 // Determine the number of destination regions for the partial object. |
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135 HeapWord* const last_word = destination + partial_obj_size - 1; |
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136 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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137 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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138 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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139 |
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140 if (beg_region_addr == end_region_addr) { |
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141 // One destination region. |
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142 _destination_count = 1; |
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143 if (end_region_addr == destination) { |
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144 // The destination falls on a region boundary, thus the first word of the |
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145 // partial object will be the first word copied to the destination region. |
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146 _dest_region_addr = end_region_addr; |
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147 _first_src_addr = sd.region_to_addr(src_region_idx); |
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148 } |
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149 } else { |
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150 // Two destination regions. When copied, the partial object will cross a |
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151 // destination region boundary, so a word somewhere within the partial |
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152 // object will be the first word copied to the second destination region. |
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153 _destination_count = 2; |
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154 _dest_region_addr = end_region_addr; |
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155 const size_t ofs = pointer_delta(end_region_addr, destination); |
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156 assert(ofs < _partial_obj_size, "sanity"); |
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157 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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158 } |
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159 } |
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160 |
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161 void SplitInfo::clear() |
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162 { |
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163 _src_region_idx = 0; |
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164 _partial_obj_size = 0; |
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165 _destination = NULL; |
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166 _destination_count = 0; |
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167 _dest_region_addr = NULL; |
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168 _first_src_addr = NULL; |
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169 assert(!is_valid(), "sanity"); |
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170 } |
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171 |
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172 #ifdef ASSERT |
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173 void SplitInfo::verify_clear() |
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174 { |
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175 assert(_src_region_idx == 0, "not clear"); |
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176 assert(_partial_obj_size == 0, "not clear"); |
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177 assert(_destination == NULL, "not clear"); |
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178 assert(_destination_count == 0, "not clear"); |
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179 assert(_dest_region_addr == NULL, "not clear"); |
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180 assert(_first_src_addr == NULL, "not clear"); |
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181 } |
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182 #endif // #ifdef ASSERT |
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183 |
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184 |
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185 void PSParallelCompact::print_on_error(outputStream* st) { |
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186 _mark_bitmap.print_on_error(st); |
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187 } |
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188 |
0 | 189 #ifndef PRODUCT |
190 const char* PSParallelCompact::space_names[] = { | |
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191 "old ", "eden", "from", "to " |
0 | 192 }; |
193 | |
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194 void PSParallelCompact::print_region_ranges() |
0 | 195 { |
196 tty->print_cr("space bottom top end new_top"); | |
197 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
198 | |
199 for (unsigned int id = 0; id < last_space_id; ++id) { | |
200 const MutableSpace* space = _space_info[id].space(); | |
201 tty->print_cr("%u %s " | |
264
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202 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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203 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 204 id, space_names[id], |
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205 summary_data().addr_to_region_idx(space->bottom()), |
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206 summary_data().addr_to_region_idx(space->top()), |
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207 summary_data().addr_to_region_idx(space->end()), |
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208 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 209 } |
210 } | |
211 | |
212 void | |
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213 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 214 { |
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215 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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216 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 217 |
218 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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219 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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220 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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221 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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222 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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223 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 224 i, c->data_location(), dci, c->destination(), |
225 c->partial_obj_size(), c->live_obj_size(), | |
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226 c->data_size(), c->source_region(), c->destination_count()); |
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227 |
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228 #undef REGION_IDX_FORMAT |
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229 #undef REGION_DATA_FORMAT |
0 | 230 } |
231 | |
232 void | |
233 print_generic_summary_data(ParallelCompactData& summary_data, | |
234 HeapWord* const beg_addr, | |
235 HeapWord* const end_addr) | |
236 { | |
237 size_t total_words = 0; | |
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238 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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239 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 240 HeapWord* pdest = 0; |
241 | |
242 while (i <= last) { | |
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243 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 244 if (c->data_size() != 0 || c->destination() != pdest) { |
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245 print_generic_summary_region(i, c); |
0 | 246 total_words += c->data_size(); |
247 pdest = c->destination(); | |
248 } | |
249 ++i; | |
250 } | |
251 | |
252 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
253 } | |
254 | |
255 void | |
256 print_generic_summary_data(ParallelCompactData& summary_data, | |
257 SpaceInfo* space_info) | |
258 { | |
259 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
260 const MutableSpace* space = space_info[id].space(); | |
261 print_generic_summary_data(summary_data, space->bottom(), | |
262 MAX2(space->top(), space_info[id].new_top())); | |
263 } | |
264 } | |
265 | |
266 void | |
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267 print_initial_summary_region(size_t i, |
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268 const ParallelCompactData::RegionData* c, |
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269 bool newline = true) |
0 | 270 { |
264
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271 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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272 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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273 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 274 i, c->destination(), |
275 c->partial_obj_size(), c->live_obj_size(), | |
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276 c->data_size(), c->source_region(), c->destination_count()); |
0 | 277 if (newline) tty->cr(); |
278 } | |
279 | |
280 void | |
281 print_initial_summary_data(ParallelCompactData& summary_data, | |
282 const MutableSpace* space) { | |
283 if (space->top() == space->bottom()) { | |
284 return; | |
285 } | |
286 | |
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287 const size_t region_size = ParallelCompactData::RegionSize; |
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288 typedef ParallelCompactData::RegionData RegionData; |
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289 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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290 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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291 const RegionData* c = summary_data.region(end_region - 1); |
0 | 292 HeapWord* end_addr = c->destination() + c->data_size(); |
293 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
294 | |
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295 // Print (and count) the full regions at the beginning of the space. |
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296 size_t full_region_count = 0; |
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297 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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298 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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299 print_initial_summary_region(i, summary_data.region(i)); |
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300 ++full_region_count; |
0 | 301 ++i; |
302 } | |
303 | |
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304 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 305 |
306 double max_reclaimed_ratio = 0.0; | |
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307 size_t max_reclaimed_ratio_region = 0; |
0 | 308 size_t max_dead_to_right = 0; |
309 size_t max_live_to_right = 0; | |
310 | |
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311 // Print the 'reclaimed ratio' for regions while there is something live in |
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312 // the region or to the right of it. The remaining regions are empty (and |
0 | 313 // uninteresting), and computing the ratio will result in division by 0. |
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314 while (i < end_region && live_to_right > 0) { |
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315 c = summary_data.region(i); |
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316 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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317 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 318 const size_t dead_to_right = used_to_right - live_to_right; |
319 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
320 | |
321 if (reclaimed_ratio > max_reclaimed_ratio) { | |
322 max_reclaimed_ratio = reclaimed_ratio; | |
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323 max_reclaimed_ratio_region = i; |
0 | 324 max_dead_to_right = dead_to_right; |
325 max_live_to_right = live_to_right; | |
326 } | |
327 | |
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328 print_initial_summary_region(i, c, false); |
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329 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 330 reclaimed_ratio, dead_to_right, live_to_right); |
331 | |
332 live_to_right -= c->data_size(); | |
333 ++i; | |
334 } | |
335 | |
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336 // Any remaining regions are empty. Print one more if there is one. |
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337 if (i < end_region) { |
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338 print_initial_summary_region(i, summary_data.region(i)); |
0 | 339 } |
340 | |
264
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341 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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342 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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343 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 344 max_live_to_right, max_reclaimed_ratio); |
345 } | |
346 | |
347 void | |
348 print_initial_summary_data(ParallelCompactData& summary_data, | |
349 SpaceInfo* space_info) { | |
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350 unsigned int id = PSParallelCompact::old_space_id; |
0 | 351 const MutableSpace* space; |
352 do { | |
353 space = space_info[id].space(); | |
354 print_initial_summary_data(summary_data, space); | |
355 } while (++id < PSParallelCompact::eden_space_id); | |
356 | |
357 do { | |
358 space = space_info[id].space(); | |
359 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
360 } while (++id < PSParallelCompact::last_space_id); | |
361 } | |
362 #endif // #ifndef PRODUCT | |
363 | |
364 #ifdef ASSERT | |
365 size_t add_obj_count; | |
366 size_t add_obj_size; | |
367 size_t mark_bitmap_count; | |
368 size_t mark_bitmap_size; | |
369 #endif // #ifdef ASSERT | |
370 | |
371 ParallelCompactData::ParallelCompactData() | |
372 { | |
373 _region_start = 0; | |
374 | |
375
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375 _region_vspace = 0; |
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376 _reserved_byte_size = 0; |
375
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377 _region_data = 0; |
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378 _region_count = 0; |
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379 |
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380 _block_vspace = 0; |
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381 _block_data = 0; |
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382 _block_count = 0; |
0 | 383 } |
384 | |
385 bool ParallelCompactData::initialize(MemRegion covered_region) | |
386 { | |
387 _region_start = covered_region.start(); | |
388 const size_t region_size = covered_region.word_size(); | |
389 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
390 | |
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391 assert(region_align_down(_region_start) == _region_start, |
0 | 392 "region start not aligned"); |
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393 assert((region_size & RegionSizeOffsetMask) == 0, |
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394 "region size not a multiple of RegionSize"); |
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395 |
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396 bool result = initialize_region_data(region_size) && initialize_block_data(); |
0 | 397 return result; |
398 } | |
399 | |
400 PSVirtualSpace* | |
401 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
402 { | |
403 const size_t raw_bytes = count * element_size; | |
404 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
405 const size_t granularity = os::vm_allocation_granularity(); | |
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406 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
0 | 407 |
408 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
409 MAX2(page_sz, granularity); | |
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410 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
0 | 411 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
412 rs.size()); | |
6197 | 413 |
414 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
415 | |
0 | 416 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
417 if (vspace != 0) { | |
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418 if (vspace->expand_by(_reserved_byte_size)) { |
0 | 419 return vspace; |
420 } | |
421 delete vspace; | |
237
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422 // Release memory reserved in the space. |
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423 rs.release(); |
0 | 424 } |
425 | |
426 return 0; | |
427 } | |
428 | |
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429 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 430 { |
375
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431 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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432 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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433 if (_region_vspace != 0) { |
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434 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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435 _region_count = count; |
0 | 436 return true; |
437 } | |
438 return false; | |
439 } | |
440 | |
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441 bool ParallelCompactData::initialize_block_data() |
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442 { |
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443 assert(_region_count != 0, "region data must be initialized first"); |
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444 const size_t count = _region_count << Log2BlocksPerRegion; |
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445 _block_vspace = create_vspace(count, sizeof(BlockData)); |
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446 if (_block_vspace != 0) { |
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447 _block_data = (BlockData*)_block_vspace->reserved_low_addr(); |
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448 _block_count = count; |
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449 return true; |
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450 } |
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451 return false; |
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452 } |
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453 |
0 | 454 void ParallelCompactData::clear() |
455 { | |
375
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456 memset(_region_data, 0, _region_vspace->committed_size()); |
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457 memset(_block_data, 0, _block_vspace->committed_size()); |
0 | 458 } |
459 | |
375
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460 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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461 assert(beg_region <= _region_count, "beg_region out of range"); |
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462 assert(end_region <= _region_count, "end_region out of range"); |
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463 assert(RegionSize % BlockSize == 0, "RegionSize not a multiple of BlockSize"); |
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464 |
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465 const size_t region_cnt = end_region - beg_region; |
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466 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
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467 |
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468 const size_t beg_block = beg_region * BlocksPerRegion; |
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469 const size_t block_cnt = region_cnt * BlocksPerRegion; |
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470 memset(_block_data + beg_block, 0, block_cnt * sizeof(BlockData)); |
0 | 471 } |
472 | |
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473 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 474 { |
375
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475 const RegionData* cur_cp = region(region_idx); |
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476 const RegionData* const end_cp = region(region_count() - 1); |
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477 |
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478 HeapWord* result = region_to_addr(region_idx); |
0 | 479 if (cur_cp < end_cp) { |
480 do { | |
481 result += cur_cp->partial_obj_size(); | |
375
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482 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 483 } |
484 return result; | |
485 } | |
486 | |
487 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
488 { | |
489 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
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490 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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491 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 492 |
493 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
494 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
495 | |
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496 if (beg_region == end_region) { |
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497 // All in one region. |
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498 _region_data[beg_region].add_live_obj(len); |
0 | 499 return; |
500 } | |
501 | |
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502 // First region. |
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503 const size_t beg_ofs = region_offset(addr); |
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504 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 505 |
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506 Klass* klass = ((oop)addr)->klass(); |
375
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507 // Middle regions--completely spanned by this object. |
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508 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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509 _region_data[region].set_partial_obj_size(RegionSize); |
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510 _region_data[region].set_partial_obj_addr(addr); |
0 | 511 } |
512 | |
375
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513 // Last region. |
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514 const size_t end_ofs = region_offset(addr + len - 1); |
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515 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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516 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 517 } |
518 | |
519 void | |
520 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
521 { | |
375
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522 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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523 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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524 |
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525 size_t cur_region = addr_to_region_idx(beg); |
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526 const size_t end_region = addr_to_region_idx(end); |
0 | 527 HeapWord* addr = beg; |
375
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528 while (cur_region < end_region) { |
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529 _region_data[cur_region].set_destination(addr); |
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530 _region_data[cur_region].set_destination_count(0); |
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531 _region_data[cur_region].set_source_region(cur_region); |
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532 _region_data[cur_region].set_data_location(addr); |
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533 |
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534 // Update live_obj_size so the region appears completely full. |
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535 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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536 _region_data[cur_region].set_live_obj_size(live_size); |
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537 |
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538 ++cur_region; |
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539 addr += RegionSize; |
0 | 540 } |
541 } | |
542 | |
482
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543 // Find the point at which a space can be split and, if necessary, record the |
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544 // split point. |
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545 // |
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546 // If the current src region (which overflowed the destination space) doesn't |
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547 // have a partial object, the split point is at the beginning of the current src |
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548 // region (an "easy" split, no extra bookkeeping required). |
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549 // |
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550 // If the current src region has a partial object, the split point is in the |
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551 // region where that partial object starts (call it the split_region). If |
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552 // split_region has a partial object, then the split point is just after that |
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553 // partial object (a "hard" split where we have to record the split data and |
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554 // zero the partial_obj_size field). With a "hard" split, we know that the |
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555 // partial_obj ends within split_region because the partial object that caused |
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556 // the overflow starts in split_region. If split_region doesn't have a partial |
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557 // obj, then the split is at the beginning of split_region (another "easy" |
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558 // split). |
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559 HeapWord* |
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560 ParallelCompactData::summarize_split_space(size_t src_region, |
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561 SplitInfo& split_info, |
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562 HeapWord* destination, |
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563 HeapWord* target_end, |
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564 HeapWord** target_next) |
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565 { |
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566 assert(destination <= target_end, "sanity"); |
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567 assert(destination + _region_data[src_region].data_size() > target_end, |
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568 "region should not fit into target space"); |
696
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569 assert(is_region_aligned(target_end), "sanity"); |
482
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570 |
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571 size_t split_region = src_region; |
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572 HeapWord* split_destination = destination; |
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573 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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574 |
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575 if (destination + partial_obj_size > target_end) { |
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576 // The split point is just after the partial object (if any) in the |
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577 // src_region that contains the start of the object that overflowed the |
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578 // destination space. |
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579 // |
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580 // Find the start of the "overflow" object and set split_region to the |
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581 // region containing it. |
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582 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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583 split_region = addr_to_region_idx(overflow_obj); |
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584 |
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585 // Clear the source_region field of all destination regions whose first word |
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586 // came from data after the split point (a non-null source_region field |
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587 // implies a region must be filled). |
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588 // |
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589 // An alternative to the simple loop below: clear during post_compact(), |
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590 // which uses memcpy instead of individual stores, and is easy to |
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591 // parallelize. (The downside is that it clears the entire RegionData |
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592 // object as opposed to just one field.) |
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593 // |
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594 // post_compact() would have to clear the summary data up to the highest |
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595 // address that was written during the summary phase, which would be |
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596 // |
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597 // max(top, max(new_top, clear_top)) |
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598 // |
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599 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
696
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600 // to target_end. |
482
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601 const RegionData* const sr = region(split_region); |
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602 const size_t beg_idx = |
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603 addr_to_region_idx(region_align_up(sr->destination() + |
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604 sr->partial_obj_size())); |
696
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605 const size_t end_idx = addr_to_region_idx(target_end); |
482
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606 |
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607 if (TraceParallelOldGCSummaryPhase) { |
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608 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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609 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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610 beg_idx, end_idx); |
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611 } |
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612 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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613 _region_data[idx].set_source_region(0); |
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614 } |
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615 |
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616 // Set split_destination and partial_obj_size to reflect the split region. |
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617 split_destination = sr->destination(); |
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618 partial_obj_size = sr->partial_obj_size(); |
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619 } |
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620 |
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621 // The split is recorded only if a partial object extends onto the region. |
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622 if (partial_obj_size != 0) { |
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623 _region_data[split_region].set_partial_obj_size(0); |
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624 split_info.record(split_region, partial_obj_size, split_destination); |
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625 } |
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626 |
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627 // Setup the continuation addresses. |
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628 *target_next = split_destination + partial_obj_size; |
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629 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 630 |
631 if (TraceParallelOldGCSummaryPhase) { | |
482
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632 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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633 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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634 " pos=" SIZE_FORMAT, |
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635 split_type, source_next, split_region, |
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636 partial_obj_size); |
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637 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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638 " tn=" PTR_FORMAT, |
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639 split_type, split_destination, |
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640 addr_to_region_idx(split_destination), |
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641 *target_next); |
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642 |
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643 if (partial_obj_size != 0) { |
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644 HeapWord* const po_beg = split_info.destination(); |
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645 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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646 gclog_or_tty->print_cr("%s split: " |
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647 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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648 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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649 split_type, |
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650 po_beg, addr_to_region_idx(po_beg), |
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651 po_end, addr_to_region_idx(po_end)); |
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652 } |
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653 } |
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654 |
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655 return source_next; |
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656 } |
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657 |
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658 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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659 HeapWord* source_beg, HeapWord* source_end, |
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660 HeapWord** source_next, |
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661 HeapWord* target_beg, HeapWord* target_end, |
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662 HeapWord** target_next) |
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663 { |
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664 if (TraceParallelOldGCSummaryPhase) { |
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665 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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666 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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667 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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668 source_beg, source_end, source_next_val, |
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669 target_beg, target_end, *target_next); |
0 | 670 } |
671 | |
375
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672 size_t cur_region = addr_to_region_idx(source_beg); |
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673 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 674 |
675 HeapWord *dest_addr = target_beg; | |
375
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676 while (cur_region < end_region) { |
482
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677 // The destination must be set even if the region has no data. |
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678 _region_data[cur_region].set_destination(dest_addr); |
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679 |
375
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680 size_t words = _region_data[cur_region].data_size(); |
0 | 681 if (words > 0) { |
482
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682 // If cur_region does not fit entirely into the target space, find a point |
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683 // at which the source space can be 'split' so that part is copied to the |
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684 // target space and the rest is copied elsewhere. |
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685 if (dest_addr + words > target_end) { |
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686 assert(source_next != NULL, "source_next is NULL when splitting"); |
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687 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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688 target_end, target_next); |
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689 return false; |
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690 } |
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691 |
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692 // Compute the destination_count for cur_region, and if necessary, update |
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693 // source_region for a destination region. The source_region field is |
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694 // updated if cur_region is the first (left-most) region to be copied to a |
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695 // destination region. |
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696 // |
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697 // The destination_count calculation is a bit subtle. A region that has |
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698 // data that compacts into itself does not count itself as a destination. |
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699 // This maintains the invariant that a zero count means the region is |
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700 // available and can be claimed and then filled. |
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701 uint destination_count = 0; |
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702 if (split_info.is_split(cur_region)) { |
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703 // The current region has been split: the partial object will be copied |
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704 // to one destination space and the remaining data will be copied to |
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705 // another destination space. Adjust the initial destination_count and, |
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706 // if necessary, set the source_region field if the partial object will |
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707 // cross a destination region boundary. |
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708 destination_count = split_info.destination_count(); |
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709 if (destination_count == 2) { |
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710 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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711 _region_data[dest_idx].set_source_region(cur_region); |
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712 } |
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|
713 } |
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714 |
0 | 715 HeapWord* const last_addr = dest_addr + words - 1; |
375
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716 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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717 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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|
718 |
375
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719 // Initially assume that the destination regions will be the same and |
0 | 720 // adjust the value below if necessary. Under this assumption, if |
375
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721 // cur_region == dest_region_2, then cur_region will be compacted |
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722 // completely into itself. |
482
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723 destination_count += cur_region == dest_region_2 ? 0 : 1; |
375
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724 if (dest_region_1 != dest_region_2) { |
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725 // Destination regions differ; adjust destination_count. |
0 | 726 destination_count += 1; |
375
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727 // Data from cur_region will be copied to the start of dest_region_2. |
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728 _region_data[dest_region_2].set_source_region(cur_region); |
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729 } else if (region_offset(dest_addr) == 0) { |
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730 // Data from cur_region will be copied to the start of the destination |
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|
731 // region. |
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732 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 733 } |
734 | |
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735 _region_data[cur_region].set_destination_count(destination_count); |
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736 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 737 dest_addr += words; |
738 } | |
739 | |
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740 ++cur_region; |
0 | 741 } |
742 | |
743 *target_next = dest_addr; | |
744 return true; | |
745 } | |
746 | |
747 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
748 assert(addr != NULL, "Should detect NULL oop earlier"); | |
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749 assert(PSParallelCompact::gc_heap()->is_in(addr), "not in heap"); |
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750 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "not marked"); |
0 | 751 |
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752 // Region covering the object. |
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753 RegionData* const region_ptr = addr_to_region_ptr(addr); |
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754 HeapWord* result = region_ptr->destination(); |
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755 |
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756 // If the entire Region is live, the new location is region->destination + the |
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757 // offset of the object within in the Region. |
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758 |
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759 // Run some performance tests to determine if this special case pays off. It |
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760 // is worth it for pointers into the dense prefix. If the optimization to |
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761 // avoid pointer updates in regions that only point to the dense prefix is |
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762 // ever implemented, this should be revisited. |
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763 if (region_ptr->data_size() == RegionSize) { |
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764 result += region_offset(addr); |
0 | 765 return result; |
766 } | |
767 | |
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768 // Otherwise, the new location is region->destination + block offset + the |
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769 // number of live words in the Block that are (a) to the left of addr and (b) |
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770 // due to objects that start in the Block. |
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771 |
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772 // Fill in the block table if necessary. This is unsynchronized, so multiple |
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773 // threads may fill the block table for a region (harmless, since it is |
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774 // idempotent). |
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775 if (!region_ptr->blocks_filled()) { |
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776 PSParallelCompact::fill_blocks(addr_to_region_idx(addr)); |
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777 region_ptr->set_blocks_filled(); |
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778 } |
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779 |
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780 HeapWord* const search_start = block_align_down(addr); |
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781 const size_t block_offset = addr_to_block_ptr(addr)->offset(); |
0 | 782 |
783 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
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784 const size_t live = bitmap->live_words_in_range(search_start, oop(addr)); |
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785 result += block_offset + live; |
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786 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result)); |
0 | 787 return result; |
788 } | |
789 | |
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790 #ifdef ASSERT |
0 | 791 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) |
792 { | |
793 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
794 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
795 for (const size_t* p = beg; p < end; ++p) { | |
796 assert(*p == 0, "not zero"); | |
797 } | |
798 } | |
799 | |
800 void ParallelCompactData::verify_clear() | |
801 { | |
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802 verify_clear(_region_vspace); |
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803 verify_clear(_block_vspace); |
0 | 804 } |
805 #endif // #ifdef ASSERT | |
806 | |
10405 | 807 STWGCTimer PSParallelCompact::_gc_timer; |
808 ParallelOldTracer PSParallelCompact::_gc_tracer; | |
0 | 809 elapsedTimer PSParallelCompact::_accumulated_time; |
810 unsigned int PSParallelCompact::_total_invocations = 0; | |
811 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
812 jlong PSParallelCompact::_time_of_last_gc = 0; | |
813 CollectorCounters* PSParallelCompact::_counters = NULL; | |
814 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
815 ParallelCompactData PSParallelCompact::_summary_data; | |
816 | |
817 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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818 |
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819 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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820 |
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821 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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822 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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823 |
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824 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure; |
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825 PSParallelCompact::AdjustKlassClosure PSParallelCompact::_adjust_klass_closure; |
0 | 826 |
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827 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); } |
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828 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); } |
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829 |
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830 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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831 |
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832 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { |
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833 mark_and_push(_compaction_manager, p); |
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834 } |
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835 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 836 |
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837 void PSParallelCompact::FollowKlassClosure::do_klass(Klass* klass) { |
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838 klass->oops_do(_mark_and_push_closure); |
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839 } |
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840 void PSParallelCompact::AdjustKlassClosure::do_klass(Klass* klass) { |
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841 klass->oops_do(&PSParallelCompact::_adjust_pointer_closure); |
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842 } |
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843 |
0 | 844 void PSParallelCompact::post_initialize() { |
845 ParallelScavengeHeap* heap = gc_heap(); | |
846 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
847 | |
848 MemRegion mr = heap->reserved_region(); | |
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849 _ref_processor = |
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850 new ReferenceProcessor(mr, // span |
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851 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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852 (int) ParallelGCThreads, // mt processing degree |
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853 true, // mt discovery |
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854 (int) ParallelGCThreads, // mt discovery degree |
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855 true, // atomic_discovery |
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856 &_is_alive_closure); // non-header is alive closure |
0 | 857 _counters = new CollectorCounters("PSParallelCompact", 1); |
858 | |
859 // Initialize static fields in ParCompactionManager. | |
860 ParCompactionManager::initialize(mark_bitmap()); | |
861 } | |
862 | |
863 bool PSParallelCompact::initialize() { | |
864 ParallelScavengeHeap* heap = gc_heap(); | |
865 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
866 MemRegion mr = heap->reserved_region(); | |
867 | |
868 // Was the old gen get allocated successfully? | |
869 if (!heap->old_gen()->is_allocated()) { | |
870 return false; | |
871 } | |
872 | |
873 initialize_space_info(); | |
874 initialize_dead_wood_limiter(); | |
875 | |
876 if (!_mark_bitmap.initialize(mr)) { | |
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877 vm_shutdown_during_initialization( |
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878 err_msg("Unable to allocate " SIZE_FORMAT "KB bitmaps for parallel " |
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879 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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880 _mark_bitmap.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 881 return false; |
882 } | |
883 | |
884 if (!_summary_data.initialize(mr)) { | |
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885 vm_shutdown_during_initialization( |
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886 err_msg("Unable to allocate " SIZE_FORMAT "KB card tables for parallel " |
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887 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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888 _summary_data.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 889 return false; |
890 } | |
891 | |
892 return true; | |
893 } | |
894 | |
895 void PSParallelCompact::initialize_space_info() | |
896 { | |
897 memset(&_space_info, 0, sizeof(_space_info)); | |
898 | |
899 ParallelScavengeHeap* heap = gc_heap(); | |
900 PSYoungGen* young_gen = heap->young_gen(); | |
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901 |
0 | 902 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
903 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
904 _space_info[from_space_id].set_space(young_gen->from_space()); | |
905 _space_info[to_space_id].set_space(young_gen->to_space()); | |
906 | |
907 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
908 } | |
909 | |
910 void PSParallelCompact::initialize_dead_wood_limiter() | |
911 { | |
912 const size_t max = 100; | |
913 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
914 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
915 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
916 DEBUG_ONLY(_dwl_initialized = true;) | |
917 _dwl_adjustment = normal_distribution(1.0); | |
918 } | |
919 | |
920 // Simple class for storing info about the heap at the start of GC, to be used | |
921 // after GC for comparison/printing. | |
922 class PreGCValues { | |
923 public: | |
924 PreGCValues() { } | |
925 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
926 | |
927 void fill(ParallelScavengeHeap* heap) { | |
928 _heap_used = heap->used(); | |
929 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
930 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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931 _metadata_used = MetaspaceAux::used_bytes(); |
0 | 932 }; |
933 | |
934 size_t heap_used() const { return _heap_used; } | |
935 size_t young_gen_used() const { return _young_gen_used; } | |
936 size_t old_gen_used() const { return _old_gen_used; } | |
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937 size_t metadata_used() const { return _metadata_used; } |
0 | 938 |
939 private: | |
940 size_t _heap_used; | |
941 size_t _young_gen_used; | |
942 size_t _old_gen_used; | |
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943 size_t _metadata_used; |
0 | 944 }; |
945 | |
946 void | |
947 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
948 { | |
949 // At this point, top is the value before GC, new_top() is the value that will | |
950 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
951 // should be marked above top. The summary data is cleared to the larger of | |
952 // top & new_top. | |
953 MutableSpace* const space = _space_info[id].space(); | |
954 HeapWord* const bot = space->bottom(); | |
955 HeapWord* const top = space->top(); | |
956 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
957 | |
958 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
959 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
960 _mark_bitmap.clear_range(beg_bit, end_bit); | |
961 | |
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962 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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963 const size_t end_region = |
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964 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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965 _summary_data.clear_range(beg_region, end_region); |
482
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966 |
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967 // Clear the data used to 'split' regions. |
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968 SplitInfo& split_info = _space_info[id].split_info(); |
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969 if (split_info.is_valid()) { |
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970 split_info.clear(); |
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971 } |
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972 DEBUG_ONLY(split_info.verify_clear();) |
0 | 973 } |
974 | |
975 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
976 { | |
977 // Update the from & to space pointers in space_info, since they are swapped | |
978 // at each young gen gc. Do the update unconditionally (even though a | |
979 // promotion failure does not swap spaces) because an unknown number of minor | |
980 // collections will have swapped the spaces an unknown number of times. | |
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981 GCTraceTime tm("pre compact", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 982 ParallelScavengeHeap* heap = gc_heap(); |
983 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
984 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
985 | |
986 pre_gc_values->fill(heap); | |
987 | |
988 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
989 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
990 | |
991 // Increment the invocation count | |
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992 heap->increment_total_collections(true); |
0 | 993 |
994 // We need to track unique mark sweep invocations as well. | |
995 _total_invocations++; | |
996 | |
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997 heap->print_heap_before_gc(); |
10405 | 998 heap->trace_heap_before_gc(&_gc_tracer); |
0 | 999 |
1000 // Fill in TLABs | |
1001 heap->accumulate_statistics_all_tlabs(); | |
1002 heap->ensure_parsability(true); // retire TLABs | |
1003 | |
1004 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
1005 HandleMark hm; // Discard invalid handles created during verification | |
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1006 Universe::verify(" VerifyBeforeGC:"); |
0 | 1007 } |
1008 | |
1009 // Verify object start arrays | |
1010 if (VerifyObjectStartArray && | |
1011 VerifyBeforeGC) { | |
1012 heap->old_gen()->verify_object_start_array(); | |
1013 } | |
1014 | |
1015 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
1016 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 1017 |
1018 // Have worker threads release resources the next time they run a task. | |
1019 gc_task_manager()->release_all_resources(); | |
0 | 1020 } |
1021 | |
1022 void PSParallelCompact::post_compact() | |
1023 { | |
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1024 GCTraceTime tm("post compact", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 1025 |
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1026 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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1027 // Clear the marking bitmap, summary data and split info. |
0 | 1028 clear_data_covering_space(SpaceId(id)); |
482
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1029 // Update top(). Must be done after clearing the bitmap and summary data. |
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1030 _space_info[id].publish_new_top(); |
0 | 1031 } |
1032 | |
1033 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1034 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1035 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1036 | |
1037 ParallelScavengeHeap* heap = gc_heap(); | |
1038 bool eden_empty = eden_space->is_empty(); | |
1039 if (!eden_empty) { | |
1040 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1041 heap->young_gen(), heap->old_gen()); | |
1042 } | |
1043 | |
1044 // Update heap occupancy information which is used as input to the soft ref | |
1045 // clearing policy at the next gc. | |
1046 Universe::update_heap_info_at_gc(); | |
1047 | |
1048 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1049 to_space->is_empty(); | |
1050 | |
1051 BarrierSet* bs = heap->barrier_set(); | |
1052 if (bs->is_a(BarrierSet::ModRef)) { | |
1053 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1054 MemRegion old_mr = heap->old_gen()->reserved(); | |
1055 | |
1056 if (young_gen_empty) { | |
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1057 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1058 } else { |
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1059 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1060 } |
1061 } | |
1062 | |
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1063 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1064 ClassLoaderDataGraph::purge(); |
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1065 MetaspaceAux::verify_metrics(); |
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1066 |
0 | 1067 Threads::gc_epilogue(); |
1068 CodeCache::gc_epilogue(); | |
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1069 JvmtiExport::gc_epilogue(); |
0 | 1070 |
1071 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1072 | |
1073 ref_processor()->enqueue_discovered_references(NULL); | |
1074 | |
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1075 if (ZapUnusedHeapArea) { |
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1076 heap->gen_mangle_unused_area(); |
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1077 } |
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1078 |
0 | 1079 // Update time of last GC |
1080 reset_millis_since_last_gc(); | |
1081 } | |
1082 | |
1083 HeapWord* | |
1084 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1085 bool maximum_compaction) | |
1086 { | |
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1087 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1088 const ParallelCompactData& sd = summary_data(); |
1089 | |
1090 const MutableSpace* const space = _space_info[id].space(); | |
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1091 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1092 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1093 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1094 |
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1095 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1096 // of the dense prefix. |
1097 size_t full_count = 0; | |
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1098 const RegionData* cp; |
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1099 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1100 ++full_count; |
1101 } | |
1102 | |
1103 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1104 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1105 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1106 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1107 _maximum_compaction_gc_num = total_invocations(); | |
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1108 return sd.region_to_addr(cp); |
0 | 1109 } |
1110 | |
1111 HeapWord* const new_top = _space_info[id].new_top(); | |
1112 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1113 const size_t space_used = space->used_in_words(); | |
1114 const size_t space_capacity = space->capacity_in_words(); | |
1115 | |
1116 const double cur_density = double(space_live) / space_capacity; | |
1117 const double deadwood_density = | |
1118 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1119 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1120 | |
1121 if (TraceParallelOldGCDensePrefix) { | |
1122 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1123 cur_density, deadwood_density, deadwood_goal); | |
1124 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1125 "space_cap=" SIZE_FORMAT, | |
1126 space_live, space_used, | |
1127 space_capacity); | |
1128 } | |
1129 | |
1130 // XXX - Use binary search? | |
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1131 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1132 const RegionData* full_cp = cp; |
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1133 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1134 while (cp < end_cp) { |
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1135 HeapWord* region_destination = cp->destination(); |
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1136 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1137 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1138 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1139 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1140 sd.region(cp), region_destination, |
0 | 1141 dense_prefix, cur_deadwood); |
1142 } | |
1143 | |
1144 if (cur_deadwood >= deadwood_goal) { | |
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1145 // Found the region that has the correct amount of deadwood to the left. |
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1146 // This typically occurs after crossing a fairly sparse set of regions, so |
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1147 // iterate backwards over those sparse regions, looking for the region |
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1148 // that has the lowest density of live objects 'to the right.' |
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1149 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1150 size_t live_to_left = space_to_left - cur_deadwood; |
1151 size_t space_to_right = space_capacity - space_to_left; | |
1152 size_t live_to_right = space_live - live_to_left; | |
1153 double density_to_right = double(live_to_right) / space_to_right; | |
1154 while (cp > full_cp) { | |
1155 --cp; | |
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1156 const size_t prev_region_live_to_right = live_to_right - |
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1157 cp->data_size(); |
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1158 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1159 double prev_region_density_to_right = |
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1160 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1161 if (density_to_right <= prev_region_density_to_right) { |
0 | 1162 return dense_prefix; |
1163 } | |
1164 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1165 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1166 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1167 prev_region_density_to_right); |
0 | 1168 } |
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1169 dense_prefix -= region_size; |
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1170 live_to_right = prev_region_live_to_right; |
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1171 space_to_right = prev_region_space_to_right; |
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1172 density_to_right = prev_region_density_to_right; |
0 | 1173 } |
1174 return dense_prefix; | |
1175 } | |
1176 | |
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1177 dense_prefix += region_size; |
0 | 1178 ++cp; |
1179 } | |
1180 | |
1181 return dense_prefix; | |
1182 } | |
1183 | |
1184 #ifndef PRODUCT | |
1185 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1186 const SpaceId id, | |
1187 const bool maximum_compaction, | |
1188 HeapWord* const addr) | |
1189 { | |
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1190 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1191 RegionData* const cp = summary_data().region(region_idx); |
0 | 1192 const MutableSpace* const space = _space_info[id].space(); |
1193 HeapWord* const new_top = _space_info[id].new_top(); | |
1194 | |
1195 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1196 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1197 const size_t space_cap = space->capacity_in_words(); | |
1198 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1199 const size_t live_to_right = new_top - cp->destination(); | |
1200 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1201 | |
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1202 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1203 "spl=" SIZE_FORMAT " " |
1204 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1205 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1206 " ratio=%10.8f", | |
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1207 algorithm, addr, region_idx, |
0 | 1208 space_live, |
1209 dead_to_left, dead_to_left_pct, | |
1210 dead_to_right, live_to_right, | |
1211 double(dead_to_right) / live_to_right); | |
1212 } | |
1213 #endif // #ifndef PRODUCT | |
1214 | |
1215 // Return a fraction indicating how much of the generation can be treated as | |
1216 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1217 // based on the density of live objects in the generation to determine a limit, | |
1218 // which is then adjusted so the return value is min_percent when the density is | |
1219 // 1. | |
1220 // | |
1221 // The following table shows some return values for a different values of the | |
1222 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1223 // min_percent is 1. | |
1224 // | |
1225 // fraction allowed as dead wood | |
1226 // ----------------------------------------------------------------- | |
1227 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1228 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1229 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1230 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1231 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1232 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1233 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1234 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1235 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1236 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1237 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1238 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1239 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1240 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1241 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1242 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1243 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1244 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1245 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1246 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1247 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1248 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1249 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1250 | |
1251 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1252 { | |
1253 assert(_dwl_initialized, "uninitialized"); | |
1254 | |
1255 // The raw limit is the value of the normal distribution at x = density. | |
1256 const double raw_limit = normal_distribution(density); | |
1257 | |
1258 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1259 // | |
1260 // First subtract the adjustment value (which is simply the precomputed value | |
1261 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1262 // Then add the minimum value, so the minimum is returned when the density is | |
1263 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1264 const double min = double(min_percent) / 100.0; | |
1265 const double limit = raw_limit - _dwl_adjustment + min; | |
1266 return MAX2(limit, 0.0); | |
1267 } | |
1268 | |
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1269 ParallelCompactData::RegionData* |
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1270 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1271 const RegionData* end) |
0 | 1272 { |
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1273 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1274 ParallelCompactData& sd = summary_data(); |
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1275 size_t left = sd.region(beg); |
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1276 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1277 |
1278 // Binary search. | |
1279 while (left < right) { | |
1280 // Equivalent to (left + right) / 2, but does not overflow. | |
1281 const size_t middle = left + (right - left) / 2; | |
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1282 RegionData* const middle_ptr = sd.region(middle); |
0 | 1283 HeapWord* const dest = middle_ptr->destination(); |
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1284 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1285 assert(dest != NULL, "sanity"); |
1286 assert(dest <= addr, "must move left"); | |
1287 | |
1288 if (middle > left && dest < addr) { | |
1289 right = middle - 1; | |
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1290 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1291 left = middle + 1; |
1292 } else { | |
1293 return middle_ptr; | |
1294 } | |
1295 } | |
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1296 return sd.region(left); |
0 | 1297 } |
1298 | |
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1299 ParallelCompactData::RegionData* |
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1300 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1301 const RegionData* end, |
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1302 size_t dead_words) |
0 | 1303 { |
1304 ParallelCompactData& sd = summary_data(); | |
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1305 size_t left = sd.region(beg); |
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1306 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1307 |
1308 // Binary search. | |
1309 while (left < right) { | |
1310 // Equivalent to (left + right) / 2, but does not overflow. | |
1311 const size_t middle = left + (right - left) / 2; | |
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1312 RegionData* const middle_ptr = sd.region(middle); |
0 | 1313 HeapWord* const dest = middle_ptr->destination(); |
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1314 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1315 assert(dest != NULL, "sanity"); |
1316 assert(dest <= addr, "must move left"); | |
1317 | |
1318 const size_t dead_to_left = pointer_delta(addr, dest); | |
1319 if (middle > left && dead_to_left > dead_words) { | |
1320 right = middle - 1; | |
1321 } else if (middle < right && dead_to_left < dead_words) { | |
1322 left = middle + 1; | |
1323 } else { | |
1324 return middle_ptr; | |
1325 } | |
1326 } | |
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1327 return sd.region(left); |
0 | 1328 } |
1329 | |
1330 // The result is valid during the summary phase, after the initial summarization | |
1331 // of each space into itself, and before final summarization. | |
1332 inline double | |
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1333 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1334 HeapWord* const bottom, |
1335 HeapWord* const top, | |
1336 HeapWord* const new_top) | |
1337 { | |
1338 ParallelCompactData& sd = summary_data(); | |
1339 | |
1340 assert(cp != NULL, "sanity"); | |
1341 assert(bottom != NULL, "sanity"); | |
1342 assert(top != NULL, "sanity"); | |
1343 assert(new_top != NULL, "sanity"); | |
1344 assert(top >= new_top, "summary data problem?"); | |
1345 assert(new_top > bottom, "space is empty; should not be here"); | |
1346 assert(new_top >= cp->destination(), "sanity"); | |
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1347 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1348 |
1349 HeapWord* const destination = cp->destination(); | |
1350 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1351 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1352 const size_t compacted_region_used = pointer_delta(top, |
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1353 sd.region_to_addr(cp)); |
0 | 1354 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1355 | |
1356 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1357 return double(reclaimable) / divisor; | |
1358 } | |
1359 | |
1360 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1361 // compacted region. The address is always on a region boundary. |
0 | 1362 // |
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1363 // Completely full regions at the left are skipped, since no compaction can |
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1364 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1365 // computed, based on the density (amount live / capacity) of the generation; |
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1366 // the region with approximately that amount of dead space to the left is |
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1367 // identified as the limit region. Regions between the last completely full |
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1368 // region and the limit region are scanned and the one that has the best |
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1369 // (maximum) reclaimed_ratio() is selected. |
0 | 1370 HeapWord* |
1371 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1372 bool maximum_compaction) | |
1373 { | |
483
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1374 if (ParallelOldGCSplitALot) { |
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1375 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1376 // The value was chosen to provoke splitting a young gen space; use it. |
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1377 return _space_info[id].dense_prefix(); |
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1378 } |
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1379 } |
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1380 |
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1381 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1382 const ParallelCompactData& sd = summary_data(); |
1383 | |
1384 const MutableSpace* const space = _space_info[id].space(); | |
1385 HeapWord* const top = space->top(); | |
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1386 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1387 HeapWord* const new_top = _space_info[id].new_top(); |
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1388 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1389 HeapWord* const bottom = space->bottom(); |
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1390 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1391 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1392 const RegionData* const new_top_cp = |
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1393 sd.addr_to_region_ptr(new_top_aligned_up); |
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1394 |
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1395 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1396 // of the dense prefix. |
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1397 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1398 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1399 space->is_empty(), "no dead space allowed to the left"); |
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1400 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1401 "region must have dead space"); |
0 | 1402 |
1403 // The gc number is saved whenever a maximum compaction is done, and used to | |
1404 // determine when the maximum compaction interval has expired. This avoids | |
1405 // successive max compactions for different reasons. | |
1406 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1407 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1408 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1409 total_invocations() == HeapFirstMaximumCompactionCount; | |
1410 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1411 _maximum_compaction_gc_num = total_invocations(); | |
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1412 return sd.region_to_addr(full_cp); |
0 | 1413 } |
1414 | |
1415 const size_t space_live = pointer_delta(new_top, bottom); | |
1416 const size_t space_used = space->used_in_words(); | |
1417 const size_t space_capacity = space->capacity_in_words(); | |
1418 | |
1419 const double density = double(space_live) / double(space_capacity); | |
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1420 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1421 const double limiter = dead_wood_limiter(density, min_percent_free); |
1422 const size_t dead_wood_max = space_used - space_live; | |
1423 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1424 dead_wood_max); | |
1425 | |
1426 if (TraceParallelOldGCDensePrefix) { | |
1427 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1428 "space_cap=" SIZE_FORMAT, | |
1429 space_live, space_used, | |
1430 space_capacity); | |
1431 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1432 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1433 density, min_percent_free, limiter, | |
1434 dead_wood_max, dead_wood_limit); | |
1435 } | |
1436 | |
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1437 // Locate the region with the desired amount of dead space to the left. |
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1438 const RegionData* const limit_cp = |
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1439 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1440 |
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1441 // Scan from the first region with dead space to the limit region and find the |
0 | 1442 // one with the best (largest) reclaimed ratio. |
1443 double best_ratio = 0.0; | |
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1444 const RegionData* best_cp = full_cp; |
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1445 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1446 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1447 if (tmp_ratio > best_ratio) { | |
1448 best_cp = cp; | |
1449 best_ratio = tmp_ratio; | |
1450 } | |
1451 } | |
1452 | |
1453 #if 0 | |
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1454 // Something to consider: if the region with the best ratio is 'close to' the |
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1455 // first region w/free space, choose the first region with free space |
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1456 // ("first-free"). The first-free region is usually near the start of the |
0 | 1457 // heap, which means we are copying most of the heap already, so copy a bit |
1458 // more to get complete compaction. | |
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1459 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1460 _maximum_compaction_gc_num = total_invocations(); |
1461 best_cp = full_cp; | |
1462 } | |
1463 #endif // #if 0 | |
1464 | |
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1465 return sd.region_to_addr(best_cp); |
0 | 1466 } |
1467 | |
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1468 #ifndef PRODUCT |
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1469 void |
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1470 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1471 size_t words) |
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1472 { |
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1473 if (TraceParallelOldGCSummaryPhase) { |
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1474 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1475 SIZE_FORMAT, start, start + words, words); |
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1476 } |
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1477 |
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6765954: par compact - stress mode for splitting young gen spaces
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1478 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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|
1479 CollectedHeap::fill_with_objects(start, words); |
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1480 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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changeset
|
1481 _mark_bitmap.mark_obj(p, words); |
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diff
changeset
|
1482 _summary_data.add_obj(p, words); |
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diff
changeset
|
1483 start_array->allocate_block(p); |
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diff
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|
1484 } |
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|
1485 } |
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diff
changeset
|
1486 |
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diff
changeset
|
1487 void |
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|
1488 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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|
1489 { |
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diff
changeset
|
1490 ParallelCompactData& sd = summary_data(); |
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changeset
|
1491 MutableSpace* space = _space_info[id].space(); |
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|
1492 |
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diff
changeset
|
1493 // Find the source and destination start addresses. |
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changeset
|
1494 HeapWord* const src_addr = sd.region_align_down(start); |
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|
1495 HeapWord* dst_addr; |
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1496 if (src_addr < start) { |
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|
1497 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1498 } else if (src_addr > space->bottom()) { |
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1499 // The start (the original top() value) is aligned to a region boundary so |
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1500 // the associated region does not have a destination. Compute the |
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|
1501 // destination from the previous region. |
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|
1502 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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|
1503 dst_addr = cp->destination() + cp->data_size(); |
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1504 } else { |
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changeset
|
1505 // Filling the entire space. |
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changeset
|
1506 dst_addr = space->bottom(); |
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diff
changeset
|
1507 } |
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diff
changeset
|
1508 assert(dst_addr != NULL, "sanity"); |
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diff
changeset
|
1509 |
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diff
changeset
|
1510 // Update the summary data. |
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changeset
|
1511 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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changeset
|
1512 src_addr, space->top(), NULL, |
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diff
changeset
|
1513 dst_addr, space->end(), |
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diff
changeset
|
1514 _space_info[id].new_top_addr()); |
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changeset
|
1515 assert(result, "should not fail: bad filler object size"); |
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|
1516 } |
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diff
changeset
|
1517 |
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diff
changeset
|
1518 void |
496
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diff
changeset
|
1519 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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|
1520 { |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1521 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1522 return; |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
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diff
changeset
|
1523 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1524 |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1525 MutableSpace* const space = _space_info[id].space(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1526 if (space->is_empty()) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1527 HeapWord* b = space->bottom(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
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diff
changeset
|
1528 HeapWord* t = b + space->capacity_in_words() / 2; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1529 space->set_top(t); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1530 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1531 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1532 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
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diff
changeset
|
1533 |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1489
diff
changeset
|
1534 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
|
1535 size_t obj_len = min_size; |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1536 while (b + obj_len <= t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1537 CollectedHeap::fill_with_object(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1538 mark_bitmap()->mark_obj(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1539 summary_data().add_obj(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
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495
diff
changeset
|
1540 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
|
1541 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
|
1542 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1543 if (b < t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1544 // 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
|
1545 space->set_top(b); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1546 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1547 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1548 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1549 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1550 |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1551 HeapWord** nta = _space_info[id].new_top_addr(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1552 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
|
1553 space->bottom(), space->top(), NULL, |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1554 space->bottom(), space->end(), nta); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1555 assert(result, "space must fit into itself"); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1556 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1557 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1558 |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1559 void |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1560 PSParallelCompact::provoke_split(bool & max_compaction) |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1561 { |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1562 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1563 return; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1564 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1565 |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1566 const size_t region_size = ParallelCompactData::RegionSize; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1567 ParallelCompactData& sd = summary_data(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1568 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1569 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
|
1570 MutableSpace* const from_space = _space_info[from_space_id].space(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1571 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
|
1572 _space_info[eden_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1573 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
|
1574 _space_info[from_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1575 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1576 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
|
1577 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1578 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1579 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
|
1580 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
|
1581 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1582 // 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
|
1583 SpaceId id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1584 MutableSpace* space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1585 size_t live_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1586 size_t fill_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1587 if (eden_live + eden_fillable >= region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1588 id = eden_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1589 space = eden_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1590 live_words = eden_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1591 fill_words = eden_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1592 } 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
|
1593 id = from_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1594 space = from_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1595 live_words = from_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1596 fill_words = from_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1597 } else { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1598 return; // Give up. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1599 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1600 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
|
1601 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1602 if (live_words < region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1603 // Fill from top() to end() w/live objects of mixed sizes. |
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1604 HeapWord* const fill_start = space->top(); |
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1605 live_words += fill_words; |
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1606 |
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1607 space->set_top(fill_start + fill_words); |
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1608 if (ZapUnusedHeapArea) { |
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|
1609 space->set_top_for_allocations(); |
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|
1610 } |
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|
1611 |
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1612 HeapWord* cur_addr = fill_start; |
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1613 while (fill_words > 0) { |
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1614 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1615 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1616 if (fill_words - cur_size < min_fill_size) { |
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1617 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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1618 } |
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|
1619 |
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1620 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1621 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1622 sd.add_obj(cur_addr, cur_size); |
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1623 |
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1624 cur_addr += cur_size; |
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1625 fill_words -= cur_size; |
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1626 } |
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1627 |
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1628 summarize_new_objects(id, fill_start); |
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1629 } |
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1630 |
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1631 max_compaction = false; |
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1632 |
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1633 // Manipulate the old gen so that it has room for about half of the live data |
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1634 // in the target young gen space (live_words / 2). |
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1635 id = old_space_id; |
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1636 space = _space_info[id].space(); |
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1637 const size_t free_at_end = space->free_in_words(); |
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1638 const size_t free_target = align_object_size(live_words / 2); |
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1639 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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1640 |
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1641 if (free_at_end >= free_target + min_fill_size) { |
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1642 // Fill space above top() and set the dense prefix so everything survives. |
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1643 HeapWord* const fill_start = space->top(); |
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1644 const size_t fill_size = free_at_end - free_target; |
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1645 space->set_top(space->top() + fill_size); |
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1646 if (ZapUnusedHeapArea) { |
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1647 space->set_top_for_allocations(); |
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1648 } |
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1649 fill_with_live_objects(id, fill_start, fill_size); |
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1650 summarize_new_objects(id, fill_start); |
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1651 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1652 } else if (dead + free_at_end > free_target) { |
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1653 // Find a dense prefix that makes the right amount of space available. |
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1654 HeapWord* cur = sd.region_align_down(space->top()); |
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1655 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1656 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1657 while (dead_to_right < free_target) { |
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1658 cur -= region_size; |
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1659 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1660 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1661 } |
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1662 _space_info[id].set_dense_prefix(cur); |
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1663 } |
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1664 } |
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1665 #endif // #ifndef PRODUCT |
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1666 |
0 | 1667 void PSParallelCompact::summarize_spaces_quick() |
1668 { | |
1669 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1670 const MutableSpace* space = _space_info[i].space(); | |
482
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1671 HeapWord** nta = _space_info[i].new_top_addr(); |
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1672 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1673 space->bottom(), space->top(), NULL, |
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1674 space->bottom(), space->end(), nta); |
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1675 assert(result, "space must fit into itself"); |
0 | 1676 _space_info[i].set_dense_prefix(space->bottom()); |
1677 } | |
496
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1678 |
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1679 #ifndef PRODUCT |
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1680 if (ParallelOldGCSplitALot) { |
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1681 provoke_split_fill_survivor(to_space_id); |
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1682 } |
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1683 #endif // #ifndef PRODUCT |
0 | 1684 } |
1685 | |
1686 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1687 { | |
1688 HeapWord* const dense_prefix_end = dense_prefix(id); | |
375
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1689 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1690 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
375
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1691 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1692 // Only enough dead space is filled so that any remaining dead space to the |
1693 // left is larger than the minimum filler object. (The remainder is filled | |
1694 // during the copy/update phase.) | |
1695 // | |
1696 // The size of the dead space to the right of the boundary is not a | |
1697 // concern, since compaction will be able to use whatever space is | |
1698 // available. | |
1699 // | |
1700 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1701 // surrounds the space to be filled with an object. | |
1702 // | |
1703 // In the 32-bit VM, each bit represents two 32-bit words: | |
1704 // +---+ | |
1705 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1706 // end_bits: ... x x x | 0 | || 0 x x ... | |
1707 // +---+ | |
1708 // | |
1709 // In the 64-bit VM, each bit represents one 64-bit word: | |
1710 // +------------+ | |
1711 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1712 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1713 // +------------+ | |
1714 // +-------+ | |
1715 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1716 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1717 // +-------+ | |
1718 // +-----------+ | |
1719 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1720 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1721 // +-----------+ | |
1722 // +-------+ | |
1723 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1724 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1725 // +-------+ | |
1726 | |
1727 // Initially assume case a, c or e will apply. | |
1571
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1728 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1729 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1730 | |
1731 #ifdef _LP64 | |
1571
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|
1732 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1733 // Cases a, c or e. |
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1734 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1735 // Case b above. |
1736 obj_beg = dense_prefix_end - 1; | |
1737 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1738 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1739 // Case d above. | |
1740 obj_beg = dense_prefix_end - 3; | |
1741 obj_len = 3; | |
1742 } | |
1743 #endif // #ifdef _LP64 | |
1744 | |
482
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1745 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1746 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1747 _summary_data.add_obj(obj_beg, obj_len); | |
1748 assert(start_array(id) != NULL, "sanity"); | |
1749 start_array(id)->allocate_block(obj_beg); | |
1750 } | |
1751 } | |
1752 | |
1753 void | |
482
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1754 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1755 { |
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1756 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1757 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1758 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1759 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1760 cur->set_source_region(0); |
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|
1761 } |
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|
1762 } |
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|
1763 |
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1764 void |
0 | 1765 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1766 { | |
1767 assert(id < last_space_id, "id out of range"); | |
483
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1768 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1769 ParallelOldGCSplitALot && id == old_space_id, |
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1770 "should have been reset in summarize_spaces_quick()"); |
0 | 1771 |
1772 const MutableSpace* space = _space_info[id].space(); | |
265
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1773 if (_space_info[id].new_top() != space->bottom()) { |
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1774 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1775 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1776 |
1777 #ifndef PRODUCT | |
265
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1778 if (TraceParallelOldGCDensePrefix) { |
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|
1779 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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|
1780 dense_prefix_end); |
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|
1781 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1782 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1783 } |
0 | 1784 #endif // #ifndef PRODUCT |
1785 | |
483
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1786 // Recompute the summary data, taking into account the dense prefix. If |
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1787 // every last byte will be reclaimed, then the existing summary data which |
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1788 // compacts everything can be left in place. |
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1789 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1790 // If dead space crosses the dense prefix boundary, it is (at least |
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1791 // partially) filled with a dummy object, marked live and added to the |
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1792 // summary data. This simplifies the copy/update phase and must be done |
483
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1793 // before the final locations of objects are determined, to prevent |
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1794 // leaving a fragment of dead space that is too small to fill. |
265
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1795 fill_dense_prefix_end(id); |
482
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1796 |
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1797 // Compute the destination of each Region, and thus each object. |
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1798 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1799 _summary_data.summarize(_space_info[id].split_info(), |
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1800 dense_prefix_end, space->top(), NULL, |
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1801 dense_prefix_end, space->end(), |
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1802 _space_info[id].new_top_addr()); |
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1803 } |
0 | 1804 } |
1805 | |
1806 if (TraceParallelOldGCSummaryPhase) { | |
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1807 const size_t region_size = ParallelCompactData::RegionSize; |
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1808 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
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1809 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1810 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
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1811 HeapWord* const new_top = _space_info[id].new_top(); |
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1812 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1813 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1814 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
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1815 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1816 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1817 id, space->capacity_in_words(), dense_prefix_end, | |
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1818 dp_region, dp_words / region_size, |
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1819 cr_words / region_size, new_top); |
0 | 1820 } |
1821 } | |
1822 | |
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1823 #ifndef PRODUCT |
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1824 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1825 HeapWord* dst_beg, HeapWord* dst_end, |
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1826 SpaceId src_space_id, |
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1827 HeapWord* src_beg, HeapWord* src_end) |
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1828 { |
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1829 if (TraceParallelOldGCSummaryPhase) { |
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1830 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1831 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1832 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1833 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1834 SIZE_FORMAT "-" SIZE_FORMAT, |
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1835 src_space_id, space_names[src_space_id], |
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1836 dst_space_id, space_names[dst_space_id], |
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1837 src_beg, src_end, |
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1838 _summary_data.addr_to_region_idx(src_beg), |
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1839 _summary_data.addr_to_region_idx(src_end), |
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1840 dst_beg, dst_end, |
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1841 _summary_data.addr_to_region_idx(dst_beg), |
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1842 _summary_data.addr_to_region_idx(dst_end)); |
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1843 } |
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1844 } |
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1845 #endif // #ifndef PRODUCT |
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1846 |
0 | 1847 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1848 bool maximum_compaction) | |
1849 { | |
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1850 GCTraceTime tm("summary phase", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 1851 // trace("2"); |
1852 | |
1853 #ifdef ASSERT | |
1854 if (TraceParallelOldGCMarkingPhase) { | |
1855 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1856 "add_obj_bytes=" SIZE_FORMAT, | |
1857 add_obj_count, add_obj_size * HeapWordSize); | |
1858 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1859 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1860 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1861 } | |
1862 #endif // #ifdef ASSERT | |
1863 | |
1864 // Quick summarization of each space into itself, to see how much is live. | |
1865 summarize_spaces_quick(); | |
1866 | |
1867 if (TraceParallelOldGCSummaryPhase) { | |
1868 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1869 Universe::print(); | |
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1870 NOT_PRODUCT(print_region_ranges()); |
0 | 1871 if (Verbose) { |
1872 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1873 } | |
1874 } | |
1875 | |
1876 // The amount of live data that will end up in old space (assuming it fits). | |
1877 size_t old_space_total_live = 0; | |
482
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1878 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1879 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1880 _space_info[id].space()->bottom()); | |
1881 } | |
1882 | |
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1883 MutableSpace* const old_space = _space_info[old_space_id].space(); |
483
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1884 const size_t old_capacity = old_space->capacity_in_words(); |
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1885 if (old_space_total_live > old_capacity) { |
0 | 1886 // XXX - should also try to expand |
1887 maximum_compaction = true; | |
1888 } | |
483
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1889 #ifndef PRODUCT |
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1890 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
496
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1891 provoke_split(maximum_compaction); |
483
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1892 } |
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1893 #endif // #ifndef PRODUCT |
0 | 1894 |
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1895 // Old generations. |
0 | 1896 summarize_space(old_space_id, maximum_compaction); |
1897 | |
482
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1898 // Summarize the remaining spaces in the young gen. The initial target space |
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1899 // is the old gen. If a space does not fit entirely into the target, then the |
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1900 // remainder is compacted into the space itself and that space becomes the new |
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1901 // target. |
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1902 SpaceId dst_space_id = old_space_id; |
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1903 HeapWord* dst_space_end = old_space->end(); |
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1904 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1905 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1906 const MutableSpace* space = _space_info[id].space(); |
1907 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1908 space->bottom()); | |
482
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1909 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1910 |
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1911 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1912 SpaceId(id), space->bottom(), space->top());) |
266
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1913 if (live > 0 && live <= available) { |
0 | 1914 // All the live data will fit. |
482
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1915 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1916 space->bottom(), space->top(), |
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1917 NULL, |
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1918 *new_top_addr, dst_space_end, |
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1919 new_top_addr); |
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1920 assert(done, "space must fit into old gen"); |
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1921 |
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1922 // Reset the new_top value for the space. |
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1923 _space_info[id].set_new_top(space->bottom()); |
482
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1924 } else if (live > 0) { |
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1925 // Attempt to fit part of the source space into the target space. |
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1926 HeapWord* next_src_addr = NULL; |
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1927 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1928 space->bottom(), space->top(), |
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1929 &next_src_addr, |
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1930 *new_top_addr, dst_space_end, |
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1931 new_top_addr); |
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1932 assert(!done, "space should not fit into old gen"); |
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1933 assert(next_src_addr != NULL, "sanity"); |
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1934 |
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1935 // The source space becomes the new target, so the remainder is compacted |
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1936 // within the space itself. |
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1937 dst_space_id = SpaceId(id); |
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1938 dst_space_end = space->end(); |
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1939 new_top_addr = _space_info[id].new_top_addr(); |
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1940 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1941 space->bottom(), dst_space_end, |
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1942 SpaceId(id), next_src_addr, space->top());) |
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1943 done = _summary_data.summarize(_space_info[id].split_info(), |
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1944 next_src_addr, space->top(), |
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1945 NULL, |
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1946 space->bottom(), dst_space_end, |
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1947 new_top_addr); |
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1948 assert(done, "space must fit when compacted into itself"); |
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1949 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1950 } |
1951 } | |
1952 | |
1953 if (TraceParallelOldGCSummaryPhase) { | |
1954 tty->print_cr("summary_phase: after final summarization"); | |
1955 Universe::print(); | |
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1956 NOT_PRODUCT(print_region_ranges()); |
0 | 1957 if (Verbose) { |
1958 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1959 } | |
1960 } | |
1961 } | |
1962 | |
1963 // This method should contain all heap-specific policy for invoking a full | |
1964 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1965 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1966 // before full gc, or any other specialized behavior, it needs to be added here. | |
1967 // | |
1968 // Note that this method should only be called from the vm_thread while at a | |
1969 // safepoint. | |
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1970 // |
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1971 // Note that the all_soft_refs_clear flag in the collector policy |
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1972 // may be true because this method can be called without intervening |
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1973 // activity. For example when the heap space is tight and full measure |
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1974 // are being taken to free space. |
0 | 1975 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1976 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1977 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1978 "should be in vm thread"); | |
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1979 |
0 | 1980 ParallelScavengeHeap* heap = gc_heap(); |
1981 GCCause::Cause gc_cause = heap->gc_cause(); | |
1982 assert(!heap->is_gc_active(), "not reentrant"); | |
1983 | |
1984 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1985 IsGCActiveMark mark; |
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1986 |
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1987 if (ScavengeBeforeFullGC) { |
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1988 PSScavenge::invoke_no_policy(); |
0 | 1989 } |
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1990 |
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1991 const bool clear_all_soft_refs = |
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1992 heap->collector_policy()->should_clear_all_soft_refs(); |
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1993 |
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1994 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1995 maximum_heap_compaction); |
0 | 1996 } |
1997 | |
1998 // This method contains no policy. You should probably | |
1999 // be calling invoke() instead. | |
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2000 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 2001 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
2002 assert(ref_processor() != NULL, "Sanity"); | |
2003 | |
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2004 if (GC_locker::check_active_before_gc()) { |
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2005 return false; |
0 | 2006 } |
2007 | |
10405 | 2008 ParallelScavengeHeap* heap = gc_heap(); |
2009 | |
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2010 _gc_timer.register_gc_start(); |
10405 | 2011 _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start()); |
2012 | |
0 | 2013 TimeStamp marking_start; |
2014 TimeStamp compaction_start; | |
2015 TimeStamp collection_exit; | |
2016 | |
2017 GCCause::Cause gc_cause = heap->gc_cause(); | |
2018 PSYoungGen* young_gen = heap->young_gen(); | |
2019 PSOldGen* old_gen = heap->old_gen(); | |
2020 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
2021 | |
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2022 // The scope of casr should end after code that can change |
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2023 // CollectorPolicy::_should_clear_all_soft_refs. |
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2024 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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2025 heap->collector_policy()); |
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2026 |
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2027 if (ZapUnusedHeapArea) { |
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2028 // Save information needed to minimize mangling |
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2029 heap->record_gen_tops_before_GC(); |
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2030 } |
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2031 |
10405 | 2032 heap->pre_full_gc_dump(&_gc_timer); |
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2033 |
0 | 2034 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2035 | |
2036 // Make sure data structures are sane, make the heap parsable, and do other | |
2037 // miscellaneous bookkeeping. | |
2038 PreGCValues pre_gc_values; | |
2039 pre_compact(&pre_gc_values); | |
2040 | |
210 | 2041 // Get the compaction manager reserved for the VM thread. |
2042 ParCompactionManager* const vmthread_cm = | |
2043 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2044 | |
0 | 2045 // Place after pre_compact() where the number of invocations is incremented. |
2046 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2047 | |
2048 { | |
2049 ResourceMark rm; | |
2050 HandleMark hm; | |
2051 | |
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2052 // Set the number of GC threads to be used in this collection |
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2053 gc_task_manager()->set_active_gang(); |
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2054 gc_task_manager()->task_idle_workers(); |
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2055 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2056 |
0 | 2057 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2058 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
20190
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2059 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL, _gc_tracer.gc_id()); |
0 | 2060 TraceCollectorStats tcs(counters()); |
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2061 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2062 |
2063 if (TraceGen1Time) accumulated_time()->start(); | |
2064 | |
2065 // Let the size policy know we're starting | |
2066 size_policy->major_collection_begin(); | |
2067 | |
2068 CodeCache::gc_prologue(); | |
2069 Threads::gc_prologue(); | |
2070 | |
2071 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2072 | |
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2073 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
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2074 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2075 |
2076 bool marked_for_unloading = false; | |
2077 | |
2078 marking_start.update(); | |
10405 | 2079 marking_phase(vmthread_cm, maximum_heap_compaction, &_gc_tracer); |
0 | 2080 |
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2081 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2082 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2083 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2084 |
2085 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2086 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2087 | |
2088 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2089 // needed by the compaction for filling holes in the dense prefix. | |
2090 adjust_roots(); | |
2091 | |
2092 compaction_start.update(); | |
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2093 compact(); |
0 | 2094 |
2095 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2096 // done before resizing. | |
2097 post_compact(); | |
2098 | |
2099 // Let the size policy know we're done | |
2100 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2101 | |
2102 if (UseAdaptiveSizePolicy) { | |
2103 if (PrintAdaptiveSizePolicy) { | |
2104 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2105 gclog_or_tty->stamp(); | |
2106 gclog_or_tty->print_cr(" collection: %d ", | |
2107 heap->total_collections()); | |
2108 if (Verbose) { | |
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2109 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2110 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2111 } |
2112 } | |
2113 | |
2114 // Don't check if the size_policy is ready here. Let | |
2115 // the size_policy check that internally. | |
2116 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2117 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2118 UseAdaptiveSizePolicyWithSystemGC)) { | |
2119 // Calculate optimal free space amounts | |
2120 assert(young_gen->max_size() > | |
2121 young_gen->from_space()->capacity_in_bytes() + | |
2122 young_gen->to_space()->capacity_in_bytes(), | |
2123 "Sizes of space in young gen are out-of-bounds"); | |
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2124 |
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2125 size_t young_live = young_gen->used_in_bytes(); |
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2126 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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2127 size_t old_live = old_gen->used_in_bytes(); |
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2128 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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2129 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 2130 size_t max_eden_size = young_gen->max_size() - |
2131 young_gen->from_space()->capacity_in_bytes() - | |
2132 young_gen->to_space()->capacity_in_bytes(); | |
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2133 |
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2134 // Used for diagnostics |
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2135 size_policy->clear_generation_free_space_flags(); |
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2136 |
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2137 size_policy->compute_generations_free_space(young_live, |
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2138 eden_live, |
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2139 old_live, |
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2140 cur_eden, |
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2141 max_old_gen_size, |
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2142 max_eden_size, |
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2143 true /* full gc*/); |
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2144 |
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2145 size_policy->check_gc_overhead_limit(young_live, |
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2146 eden_live, |
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2147 max_old_gen_size, |
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2148 max_eden_size, |
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2149 true /* full gc*/, |
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2150 gc_cause, |
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2151 heap->collector_policy()); |
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2152 |
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2153 size_policy->decay_supplemental_growth(true /* full gc*/); |
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2154 |
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2155 heap->resize_old_gen( |
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2156 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2157 |
2158 // Don't resize the young generation at an major collection. A | |
2159 // desired young generation size may have been calculated but | |
2160 // resizing the young generation complicates the code because the | |
2161 // resizing of the old generation may have moved the boundary | |
2162 // between the young generation and the old generation. Let the | |
2163 // young generation resizing happen at the minor collections. | |
2164 } | |
2165 if (PrintAdaptiveSizePolicy) { | |
2166 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2167 heap->total_collections()); | |
2168 } | |
2169 } | |
2170 | |
2171 if (UsePerfData) { | |
2172 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2173 counters->update_counters(); | |
2174 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2175 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2176 } | |
2177 | |
2178 heap->resize_all_tlabs(); | |
2179 | |
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2180 // Resize the metaspace capactiy after a collection |
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2181 MetaspaceGC::compute_new_size(); |
0 | 2182 |
2183 if (TraceGen1Time) accumulated_time()->stop(); | |
2184 | |
2185 if (PrintGC) { | |
2186 if (PrintGCDetails) { | |
2187 // No GC timestamp here. This is after GC so it would be confusing. | |
2188 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2189 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2190 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2191 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2192 } else { |
2193 heap->print_heap_change(pre_gc_values.heap_used()); | |
2194 } | |
2195 } | |
2196 | |
2197 // Track memory usage and detect low memory | |
2198 MemoryService::track_memory_usage(); | |
2199 heap->update_counters(); | |
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2200 gc_task_manager()->release_idle_workers(); |
0 | 2201 } |
2202 | |
1836
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2203 #ifdef ASSERT |
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2204 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2205 ParCompactionManager* const cm = |
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2206 ParCompactionManager::manager_array(int(i)); |
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2207 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2208 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
1836
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2209 } |
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2210 #endif // ASSERT |
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2211 |
0 | 2212 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2213 HandleMark hm; // Discard invalid handles created during verification | |
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2214 Universe::verify(" VerifyAfterGC:"); |
0 | 2215 } |
2216 | |
2217 // Re-verify object start arrays | |
2218 if (VerifyObjectStartArray && | |
2219 VerifyAfterGC) { | |
2220 old_gen->verify_object_start_array(); | |
2221 } | |
2222 | |
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2223 if (ZapUnusedHeapArea) { |
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2224 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2225 } |
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2226 |
0 | 2227 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2228 | |
2229 collection_exit.update(); | |
2230 | |
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2231 heap->print_heap_after_gc(); |
10405 | 2232 heap->trace_heap_after_gc(&_gc_tracer); |
2233 | |
0 | 2234 if (PrintGCTaskTimeStamps) { |
2235 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2236 INT64_FORMAT, | |
2237 marking_start.ticks(), compaction_start.ticks(), | |
2238 collection_exit.ticks()); | |
2239 gc_task_manager()->print_task_time_stamps(); | |
2240 } | |
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2241 |
10405 | 2242 heap->post_full_gc_dump(&_gc_timer); |
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2243 |
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2244 #ifdef TRACESPINNING |
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2245 ParallelTaskTerminator::print_termination_counts(); |
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2246 #endif |
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2247 |
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2248 _gc_timer.register_gc_end(); |
10405 | 2249 |
2250 _gc_tracer.report_dense_prefix(dense_prefix(old_space_id)); | |
2251 _gc_tracer.report_gc_end(_gc_timer.gc_end(), _gc_timer.time_partitions()); | |
2252 | |
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2253 return true; |
0 | 2254 } |
2255 | |
2256 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2257 PSYoungGen* young_gen, | |
2258 PSOldGen* old_gen) { | |
2259 MutableSpace* const eden_space = young_gen->eden_space(); | |
2260 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2261 assert(young_gen->virtual_space()->alignment() == | |
2262 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2263 | |
2264 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2265 return false; | |
2266 } | |
2267 | |
2268 // Both generations must be completely committed. | |
2269 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2270 return false; | |
2271 } | |
2272 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2273 return false; | |
2274 } | |
2275 | |
2276 // Figure out how much to take from eden. Include the average amount promoted | |
2277 // in the total; otherwise the next young gen GC will simply bail out to a | |
2278 // full GC. | |
2279 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2280 const size_t eden_used = eden_space->used_in_bytes(); | |
2281 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2282 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2283 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2284 | |
2285 if (absorb_size >= eden_capacity) { | |
2286 return false; // Must leave some space in eden. | |
2287 } | |
2288 | |
2289 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2290 if (new_young_size < young_gen->min_gen_size()) { | |
2291 return false; // Respect young gen minimum size. | |
2292 } | |
2293 | |
2294 if (TraceAdaptiveGCBoundary && Verbose) { | |
2295 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2296 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2297 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2298 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2299 absorb_size / K, | |
2300 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2301 young_gen->from_space()->used_in_bytes() / K, | |
2302 young_gen->to_space()->used_in_bytes() / K, | |
2303 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2304 } | |
2305 | |
2306 // Fill the unused part of the old gen. | |
2307 MutableSpace* const old_space = old_gen->object_space(); | |
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2308 HeapWord* const unused_start = old_space->top(); |
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2309 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2310 |
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2311 if (unused_words > 0) { |
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2312 if (unused_words < CollectedHeap::min_fill_size()) { |
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2313 return false; // If the old gen cannot be filled, must give up. |
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2314 } |
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2315 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2316 } |
2317 | |
2318 // Take the live data from eden and set both top and end in the old gen to | |
2319 // eden top. (Need to set end because reset_after_change() mangles the region | |
2320 // from end to virtual_space->high() in debug builds). | |
2321 HeapWord* const new_top = eden_space->top(); | |
2322 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2323 absorb_size); | |
2324 young_gen->reset_after_change(); | |
2325 old_space->set_top(new_top); | |
2326 old_space->set_end(new_top); | |
2327 old_gen->reset_after_change(); | |
2328 | |
2329 // Update the object start array for the filler object and the data from eden. | |
2330 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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2331 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2332 start_array->allocate_block(p); |
0 | 2333 } |
2334 | |
2335 // Could update the promoted average here, but it is not typically updated at | |
2336 // full GCs and the value to use is unclear. Something like | |
2337 // | |
2338 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2339 | |
2340 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2341 return true; | |
2342 } | |
2343 | |
2344 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2345 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2346 "shouldn't return NULL"); | |
2347 return ParallelScavengeHeap::gc_task_manager(); | |
2348 } | |
2349 | |
2350 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
10405 | 2351 bool maximum_heap_compaction, |
2352 ParallelOldTracer *gc_tracer) { | |
0 | 2353 // Recursively traverse all live objects and mark them |
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2354 GCTraceTime tm("marking phase", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2355 |
2356 ParallelScavengeHeap* heap = gc_heap(); | |
2357 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2358 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2359 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2360 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2361 |
2362 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2363 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2364 | |
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2365 // Need new claim bits before marking starts. |
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2366 ClassLoaderDataGraph::clear_claimed_marks(); |
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2367 |
0 | 2368 { |
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2369 GCTraceTime tm_m("par mark", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 2370 |
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2371 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2372 |
2373 GCTaskQueue* q = GCTaskQueue::create(); | |
2374 | |
2375 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2376 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2377 // We scan the thread roots in parallel | |
2378 Threads::create_thread_roots_marking_tasks(q); | |
2379 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2380 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2381 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2382 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
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2383 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::class_loader_data)); |
0 | 2384 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); |
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2385 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2386 |
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2387 if (active_gc_threads > 1) { |
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2388 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2389 q->enqueue(new StealMarkingTask(&terminator)); |
2390 } | |
2391 } | |
2392 | |
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2393 gc_task_manager()->execute_and_wait(q); |
0 | 2394 } |
2395 | |
2396 // Process reference objects found during marking | |
2397 { | |
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2398 GCTraceTime tm_r("reference processing", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 2399 |
2400 ReferenceProcessorStats stats; | |
0 | 2401 if (ref_processor()->processing_is_mt()) { |
2402 RefProcTaskExecutor task_executor; | |
10405 | 2403 stats = ref_processor()->process_discovered_references( |
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2404 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2405 &task_executor, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2406 } else { |
10405 | 2407 stats = ref_processor()->process_discovered_references( |
2408 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL, | |
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2409 &_gc_timer, _gc_tracer.gc_id()); |
0 | 2410 } |
10405 | 2411 |
2412 gc_tracer->report_gc_reference_stats(stats); | |
0 | 2413 } |
2414 | |
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2415 GCTraceTime tm_c("class unloading", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
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2416 |
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2417 // This is the point where the entire marking should have completed. |
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2418 assert(cm->marking_stacks_empty(), "Marking should have completed"); |
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2419 |
0 | 2420 // Follow system dictionary roots and unload classes. |
2421 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2422 | |
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2423 // Unload nmethods. |
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2424 CodeCache::do_unloading(is_alive_closure(), purged_class); |
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2425 |
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2426 // Prune dead klasses from subklass/sibling/implementor lists. |
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2427 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2428 |
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2429 // Delete entries for dead interned strings. |
0 | 2430 StringTable::unlink(is_alive_closure()); |
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2431 |
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2432 // Clean up unreferenced symbols in symbol table. |
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2433 SymbolTable::unlink(); |
10405 | 2434 _gc_tracer.report_object_count_after_gc(is_alive_closure()); |
0 | 2435 } |
2436 | |
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2437 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2438 ClassLoaderData* cld) { |
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2439 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2440 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2441 |
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2442 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2443 } |
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2444 |
0 | 2445 // This should be moved to the shared markSweep code! |
2446 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2447 public: | |
2448 bool do_object_b(oop p) { return true; } | |
2449 }; | |
2450 static PSAlwaysTrueClosure always_true; | |
2451 | |
2452 void PSParallelCompact::adjust_roots() { | |
2453 // Adjust the pointers to reflect the new locations | |
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2454 GCTraceTime tm("adjust roots", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2455 |
6725
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2456 // Need new claim bits when tracing through and adjusting pointers. |
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2457 ClassLoaderDataGraph::clear_claimed_marks(); |
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2458 |
0 | 2459 // General strong roots. |
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2460 Universe::oops_do(adjust_pointer_closure()); |
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2461 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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2462 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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2463 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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2464 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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2465 FlatProfiler::oops_do(adjust_pointer_closure()); |
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2466 Management::oops_do(adjust_pointer_closure()); |
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2467 JvmtiExport::oops_do(adjust_pointer_closure()); |
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2468 SystemDictionary::oops_do(adjust_pointer_closure()); |
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2469 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 2470 |
2471 // Now adjust pointers in remaining weak roots. (All of which should | |
2472 // have been cleared if they pointed to non-surviving objects.) | |
2473 // Global (weak) JNI handles | |
10179
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2474 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 2475 |
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2476 CodeBlobToOopClosure adjust_from_blobs(adjust_pointer_closure(), CodeBlobToOopClosure::FixRelocations); |
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2477 CodeCache::blobs_do(&adjust_from_blobs); |
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2478 StringTable::oops_do(adjust_pointer_closure()); |
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2479 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2480 // Roots were visited so references into the young gen in roots |
2481 // may have been scanned. Process them also. | |
2482 // Should the reference processor have a span that excludes | |
2483 // young gen objects? | |
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2484 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2485 } |
2486 | |
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2487 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2488 uint parallel_gc_threads) |
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2489 { |
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2490 GCTraceTime tm("drain task setup", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2491 |
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2492 // Find the threads that are active |
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2493 unsigned int which = 0; |
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2494 |
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2495 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2496 for (uint j = 0; j < task_count; j++) { |
1833
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2497 q->enqueue(new DrainStacksCompactionTask(j)); |
4095
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2498 ParCompactionManager::verify_region_list_empty(j); |
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2499 // Set the region stacks variables to "no" region stack values |
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2500 // so that they will be recognized and needing a region stack |
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2501 // in the stealing tasks if they do not get one by executing |
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2502 // a draining stack. |
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2503 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2504 cm->set_region_stack(NULL); |
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2505 cm->set_region_stack_index((uint)max_uintx); |
0 | 2506 } |
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2507 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2508 |
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2509 // Find all regions that are available (can be filled immediately) and |
0 | 2510 // distribute them to the thread stacks. The iteration is done in reverse |
375
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2511 // order (high to low) so the regions will be removed in ascending order. |
0 | 2512 |
2513 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2514 | |
375
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2515 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2516 // A region index which corresponds to the tasks created above. |
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2517 // "which" must be 0 <= which < task_count |
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2518 |
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2519 which = 0; |
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2520 // id + 1 is used to test termination so unsigned can |
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2521 // be used with an old_space_id == 0. |
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2522 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2523 SpaceInfo* const space_info = _space_info + id; |
2524 MutableSpace* const space = space_info->space(); | |
2525 HeapWord* const new_top = space_info->new_top(); | |
2526 | |
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2527 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2528 const size_t end_region = |
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2529 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
6725
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2530 |
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2531 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
375
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2532 if (sd.region(cur)->claim_unsafe()) { |
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2533 ParCompactionManager::region_list_push(which, cur); |
0 | 2534 |
2535 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
375
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2536 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2537 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
264
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2538 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2539 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2540 } | |
2541 | |
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2542 NOT_PRODUCT(++fillable_regions;) |
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2543 |
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2544 // Assign regions to tasks in round-robin fashion. |
0 | 2545 if (++which == task_count) { |
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2546 assert(which <= parallel_gc_threads, |
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|
2547 "Inconsistent number of workers"); |
0 | 2548 which = 0; |
2549 } | |
2550 } | |
2551 } | |
2552 } | |
2553 | |
2554 if (TraceParallelOldGCCompactionPhase) { | |
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2555 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2556 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2557 } |
2558 } | |
2559 | |
2560 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2561 | |
2562 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2563 uint parallel_gc_threads) { | |
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2564 GCTraceTime tm("dense prefix task setup", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2565 |
2566 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2567 | |
2568 // Iterate over all the spaces adding tasks for updating | |
375
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2569 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2570 // will work on opening the gaps and the remaining gc threads |
2571 // will work on the dense prefix. | |
482
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2572 unsigned int space_id; |
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2573 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2574 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2575 const MutableSpace* const space = _space_info[space_id].space(); | |
2576 | |
2577 if (dense_prefix_end == space->bottom()) { | |
2578 // There is no dense prefix for this space. | |
2579 continue; | |
2580 } | |
2581 | |
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2582 // The dense prefix is before this region. |
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2583 size_t region_index_end_dense_prefix = |
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2584 sd.addr_to_region_idx(dense_prefix_end); |
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2585 RegionData* const dense_prefix_cp = |
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|
2586 sd.region(region_index_end_dense_prefix); |
0 | 2587 assert(dense_prefix_end == space->end() || |
2588 dense_prefix_cp->available() || | |
2589 dense_prefix_cp->claimed(), | |
375
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2590 "The region after the dense prefix should always be ready to fill"); |
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2591 |
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2592 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2593 |
2594 // Is there dense prefix work? | |
375
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2595 size_t total_dense_prefix_regions = |
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2596 region_index_end_dense_prefix - region_index_start; |
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2597 // How many regions of the dense prefix should be given to |
0 | 2598 // each thread? |
375
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2599 if (total_dense_prefix_regions > 0) { |
0 | 2600 uint tasks_for_dense_prefix = 1; |
3251
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2601 if (total_dense_prefix_regions <= |
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2602 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2603 // Don't over partition. This assumes that |
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2604 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2605 // so there are not many regions to process. |
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2606 tasks_for_dense_prefix = parallel_gc_threads; |
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|
2607 } else { |
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|
2608 // Over partition |
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|
2609 tasks_for_dense_prefix = parallel_gc_threads * |
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2610 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2611 } |
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2612 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2613 tasks_for_dense_prefix; |
375
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2614 // Give each thread at least 1 region. |
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2615 if (regions_per_thread == 0) { |
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2616 regions_per_thread = 1; |
0 | 2617 } |
2618 | |
2619 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
375
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2620 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2621 break; |
2622 } | |
375
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2623 // region_index_end is not processed |
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2624 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2625 region_index_end_dense_prefix); |
482
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2626 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2627 region_index_start, |
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2628 region_index_end)); |
375
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2629 region_index_start = region_index_end; |
0 | 2630 } |
2631 } | |
2632 // This gets any part of the dense prefix that did not | |
2633 // fit evenly. | |
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2634 if (region_index_start < region_index_end_dense_prefix) { |
482
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2635 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2636 region_index_start, |
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2637 region_index_end_dense_prefix)); |
0 | 2638 } |
482
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2639 } |
0 | 2640 } |
2641 | |
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2642 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2643 GCTaskQueue* q, |
2644 ParallelTaskTerminator* terminator_ptr, | |
2645 uint parallel_gc_threads) { | |
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2646 GCTraceTime tm("steal task setup", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2647 |
375
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2648 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2649 // other threads. |
2650 if (parallel_gc_threads > 1) { | |
2651 for (uint j = 0; j < parallel_gc_threads; j++) { | |
375
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2652 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2653 } |
2654 } | |
2655 } | |
2656 | |
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2657 #ifdef ASSERT |
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2658 // Write a histogram of the number of times the block table was filled for a |
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2659 // region. |
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2660 void PSParallelCompact::write_block_fill_histogram(outputStream* const out) |
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2661 { |
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2662 if (!TraceParallelOldGCCompactionPhase) return; |
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2663 |
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2664 typedef ParallelCompactData::RegionData rd_t; |
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2665 ParallelCompactData& sd = summary_data(); |
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2666 |
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2667 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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2668 MutableSpace* const spc = _space_info[id].space(); |
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2669 if (spc->bottom() != spc->top()) { |
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2670 const rd_t* const beg = sd.addr_to_region_ptr(spc->bottom()); |
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2671 HeapWord* const top_aligned_up = sd.region_align_up(spc->top()); |
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2672 const rd_t* const end = sd.addr_to_region_ptr(top_aligned_up); |
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2673 |
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2674 size_t histo[5] = { 0, 0, 0, 0, 0 }; |
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2675 const size_t histo_len = sizeof(histo) / sizeof(size_t); |
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2676 const size_t region_cnt = pointer_delta(end, beg, sizeof(rd_t)); |
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2677 |
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2678 for (const rd_t* cur = beg; cur < end; ++cur) { |
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2679 ++histo[MIN2(cur->blocks_filled_count(), histo_len - 1)]; |
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2680 } |
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2681 out->print("%u %-4s" SIZE_FORMAT_W(5), id, space_names[id], region_cnt); |
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2682 for (size_t i = 0; i < histo_len; ++i) { |
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2683 out->print(" " SIZE_FORMAT_W(5) " %5.1f%%", |
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2684 histo[i], 100.0 * histo[i] / region_cnt); |
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2685 } |
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2686 out->cr(); |
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2687 } |
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2688 } |
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2689 } |
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2690 #endif // #ifdef ASSERT |
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2691 |
0 | 2692 void PSParallelCompact::compact() { |
2693 // trace("5"); | |
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2694 GCTraceTime tm("compaction phase", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2695 |
2696 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2697 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2698 PSOldGen* old_gen = heap->old_gen(); | |
2699 old_gen->start_array()->reset(); | |
2700 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2701 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2702 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2703 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2704 |
2705 GCTaskQueue* q = GCTaskQueue::create(); | |
4095
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2706 enqueue_region_draining_tasks(q, active_gc_threads); |
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2707 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2708 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2709 |
2710 { | |
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2711 GCTraceTime tm_pc("par compact", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2712 |
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2713 gc_task_manager()->execute_and_wait(q); |
0 | 2714 |
2715 #ifdef ASSERT | |
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2716 // Verify that all regions have been processed before the deferred updates. |
0 | 2717 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2718 verify_complete(SpaceId(id)); | |
2719 } | |
2720 #endif | |
2721 } | |
2722 | |
2723 { | |
2724 // Update the deferred objects, if any. Any compaction manager can be used. | |
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2725 GCTraceTime tm_du("deferred updates", print_phases(), true, &_gc_timer, _gc_tracer.gc_id()); |
0 | 2726 ParCompactionManager* cm = ParCompactionManager::manager_array(0); |
2727 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2728 update_deferred_objects(cm, SpaceId(id)); | |
2729 } | |
2730 } | |
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2731 |
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2732 DEBUG_ONLY(write_block_fill_histogram(gclog_or_tty)); |
0 | 2733 } |
2734 | |
2735 #ifdef ASSERT | |
2736 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2737 // All Regions between space bottom() to new_top() should be marked as filled |
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2738 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2739 // should have been emptied). |
2740 ParallelCompactData& sd = summary_data(); | |
2741 SpaceInfo si = _space_info[space_id]; | |
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2742 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2743 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2744 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2745 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2746 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2747 |
2748 bool issued_a_warning = false; | |
2749 | |
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2750 size_t cur_region; |
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2751 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2752 const RegionData* const c = sd.region(cur_region); |
0 | 2753 if (!c->completed()) { |
375
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2754 warning("region " SIZE_FORMAT " not filled: " |
0 | 2755 "destination_count=" SIZE_FORMAT, |
375
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2756 cur_region, c->destination_count()); |
0 | 2757 issued_a_warning = true; |
2758 } | |
2759 } | |
2760 | |
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2761 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2762 const RegionData* const c = sd.region(cur_region); |
0 | 2763 if (!c->available()) { |
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2764 warning("region " SIZE_FORMAT " not empty: " |
0 | 2765 "destination_count=" SIZE_FORMAT, |
375
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2766 cur_region, c->destination_count()); |
0 | 2767 issued_a_warning = true; |
2768 } | |
2769 } | |
2770 | |
2771 if (issued_a_warning) { | |
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2772 print_region_ranges(); |
0 | 2773 } |
2774 } | |
2775 #endif // #ifdef ASSERT | |
2776 | |
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2777 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2778 void |
2779 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2780 SpaceId space_id, | |
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2781 size_t beg_region, |
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2782 size_t end_region) { |
0 | 2783 ParallelCompactData& sd = summary_data(); |
2784 ParMarkBitMap* const mbm = mark_bitmap(); | |
2785 | |
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2786 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2787 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2788 assert(beg_region <= end_region, "bad region range"); |
0 | 2789 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2790 | |
2791 #ifdef ASSERT | |
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2792 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2793 // filled. |
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2794 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2795 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2796 } |
2797 #endif // #ifdef ASSERT | |
2798 | |
2799 if (beg_addr != space(space_id)->bottom()) { | |
2800 // Find the first live object or block of dead space that *starts* in this | |
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2801 // range of regions. If a partial object crosses onto the region, skip it; |
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2802 // it will be marked for 'deferred update' when the object head is |
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2803 // processed. If dead space crosses onto the region, it is also skipped; it |
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2804 // will be filled when the prior region is processed. If neither of those |
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2805 // apply, the first word in the region is the start of a live object or dead |
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2806 // space. |
0 | 2807 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
375
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2808 const RegionData* const cp = sd.region(beg_region); |
0 | 2809 if (cp->partial_obj_size() != 0) { |
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2810 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2811 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2812 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2813 } | |
2814 } | |
2815 | |
2816 if (beg_addr < end_addr) { | |
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2817 // A live object or block of dead space starts in this range of Regions. |
0 | 2818 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2819 | |
2820 // Create closures and iterate. | |
2821 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2822 FillClosure fill_closure(cm, space_id); | |
2823 ParMarkBitMap::IterationStatus status; | |
2824 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2825 dense_prefix_end); | |
2826 if (status == ParMarkBitMap::incomplete) { | |
2827 update_closure.do_addr(update_closure.source()); | |
2828 } | |
2829 } | |
2830 | |
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2831 // Mark the regions as filled. |
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2832 RegionData* const beg_cp = sd.region(beg_region); |
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2833 RegionData* const end_cp = sd.region(end_region); |
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2834 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2835 cp->set_completed(); |
2836 } | |
2837 } | |
2838 | |
2839 // Return the SpaceId for the space containing addr. If addr is not in the | |
2840 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2841 // in the heap and asserts such. | |
2842 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2843 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2844 | |
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2845 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2846 if (_space_info[id].space()->contains(addr)) { |
2847 return SpaceId(id); | |
2848 } | |
2849 } | |
2850 | |
2851 assert(false, "no space contains the addr"); | |
2852 return last_space_id; | |
2853 } | |
2854 | |
2855 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2856 SpaceId id) { | |
2857 assert(id < last_space_id, "bad space id"); | |
2858 | |
2859 ParallelCompactData& sd = summary_data(); | |
2860 const SpaceInfo* const space_info = _space_info + id; | |
2861 ObjectStartArray* const start_array = space_info->start_array(); | |
2862 | |
2863 const MutableSpace* const space = space_info->space(); | |
2864 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2865 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2866 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2867 |
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2868 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2869 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2870 const RegionData* cur_region; |
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2871 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2872 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2873 if (addr != NULL) { |
2874 if (start_array != NULL) { | |
2875 start_array->allocate_block(addr); | |
2876 } | |
2877 oop(addr)->update_contents(cm); | |
2878 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2879 } | |
2880 } | |
2881 } | |
2882 | |
2883 // Skip over count live words starting from beg, and return the address of the | |
2884 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2885 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2886 // an object, or account for those live words in some other way. Callers must | |
2887 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2888 HeapWord* | |
2889 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2890 { | |
2891 assert(count > 0, "sanity"); | |
2892 | |
2893 ParMarkBitMap* m = mark_bitmap(); | |
2894 idx_t bits_to_skip = m->words_to_bits(count); | |
2895 idx_t cur_beg = m->addr_to_bit(beg); | |
2896 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2897 | |
2898 do { | |
2899 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2900 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2901 const size_t obj_bits = cur_end - cur_beg + 1; | |
2902 if (obj_bits > bits_to_skip) { | |
2903 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2904 } | |
2905 bits_to_skip -= obj_bits; | |
2906 cur_beg = cur_end + 1; | |
2907 } while (bits_to_skip > 0); | |
2908 | |
2909 // Skipping the desired number of words landed just past the end of an object. | |
2910 // Find the start of the next object. | |
2911 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2912 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2913 return m->bit_to_addr(cur_beg); | |
2914 } | |
2915 | |
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2916 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2917 SpaceId src_space_id, |
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2918 size_t src_region_idx) |
0 | 2919 { |
482
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2920 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2921 |
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2922 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2923 if (split_info.dest_region_addr() == dest_addr) { |
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2924 // The partial object ending at the split point contains the first word to |
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2925 // be copied to dest_addr. |
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2926 return split_info.first_src_addr(); |
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2927 } |
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2928 |
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2929 const ParallelCompactData& sd = summary_data(); |
0 | 2930 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2931 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2932 |
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2933 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2934 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2935 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2936 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2937 |
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2938 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2939 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2940 |
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2941 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2942 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2943 |
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2944 HeapWord* addr = src_region_beg; |
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2945 if (dest_addr == src_region_destination) { |
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2946 // Return the first live word in the source region. |
0 | 2947 if (partial_obj_size == 0) { |
375
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2948 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2949 assert(addr < src_region_end, "no objects start in src region"); |
0 | 2950 } |
2951 return addr; | |
2952 } | |
2953 | |
2954 // Must skip some live data. | |
375
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2955 size_t words_to_skip = dest_addr - src_region_destination; |
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2956 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 2957 |
2958 if (partial_obj_size >= words_to_skip) { | |
2959 // All the live words to skip are part of the partial object. | |
2960 addr += words_to_skip; | |
2961 if (partial_obj_size == words_to_skip) { | |
2962 // Find the first live word past the partial object. | |
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2963 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2964 assert(addr < src_region_end, "wrong src region"); |
0 | 2965 } |
2966 return addr; | |
2967 } | |
2968 | |
2969 // Skip over the partial object (if any). | |
2970 if (partial_obj_size != 0) { | |
2971 words_to_skip -= partial_obj_size; | |
2972 addr += partial_obj_size; | |
2973 } | |
2974 | |
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2975 // Skip over live words due to objects that start in the region. |
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2976 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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2977 assert(addr < src_region_end, "wrong src region"); |
0 | 2978 return addr; |
2979 } | |
2980 | |
2981 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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2982 SpaceId src_space_id, |
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2983 size_t beg_region, |
0 | 2984 HeapWord* end_addr) |
2985 { | |
2986 ParallelCompactData& sd = summary_data(); | |
495
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2987 |
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2988 #ifdef ASSERT |
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2989 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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2990 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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2991 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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2992 "src_space_id does not match beg_addr"); |
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2993 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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2994 "src_space_id does not match end_addr"); |
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2995 #endif // #ifdef ASSERT |
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2996 |
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2997 RegionData* const beg = sd.region(beg_region); |
495
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2998 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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2999 |
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3000 // Regions up to new_top() are enqueued if they become available. |
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3001 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3002 RegionData* const enqueue_end = |
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3003 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3004 |
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3005 for (RegionData* cur = beg; cur < end; ++cur) { |
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3006 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3007 cur->decrement_destination_count(); |
495
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3008 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 3009 cm->push_region(sd.region(cur)); |
0 | 3010 } |
3011 } | |
3012 } | |
3013 | |
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3014 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3015 SpaceId& src_space_id, |
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3016 HeapWord*& src_space_top, |
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3017 HeapWord* end_addr) |
0 | 3018 { |
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3019 typedef ParallelCompactData::RegionData RegionData; |
0 | 3020 |
3021 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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3022 const size_t region_size = ParallelCompactData::RegionSize; |
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3023 |
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3024 size_t src_region_idx = 0; |
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3025 |
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3026 // Skip empty regions (if any) up to the top of the space. |
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3027 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3028 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3029 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3030 const RegionData* const top_region_ptr = |
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3031 sd.addr_to_region_ptr(top_aligned_up); |
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3032 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3033 ++src_region_ptr; |
0 | 3034 } |
3035 | |
375
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3036 if (src_region_ptr < top_region_ptr) { |
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3037 // The next source region is in the current space. Update src_region_idx |
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3038 // and the source address to match src_region_ptr. |
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3039 src_region_idx = sd.region(src_region_ptr); |
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3040 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3041 if (src_region_addr > closure.source()) { |
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3042 closure.set_source(src_region_addr); |
0 | 3043 } |
375
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3044 return src_region_idx; |
0 | 3045 } |
3046 | |
375
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3047 // Switch to a new source space and find the first non-empty region. |
0 | 3048 unsigned int space_id = src_space_id + 1; |
3049 assert(space_id < last_space_id, "not enough spaces"); | |
3050 | |
3051 HeapWord* const destination = closure.destination(); | |
3052 | |
3053 do { | |
3054 MutableSpace* space = _space_info[space_id].space(); | |
3055 HeapWord* const bottom = space->bottom(); | |
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3056 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3057 |
3058 // Iterate over the spaces that do not compact into themselves. | |
3059 if (bottom_cp->destination() != bottom) { | |
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3060 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3061 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3062 |
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3063 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3064 if (src_cp->live_obj_size() > 0) { |
3065 // Found it. | |
3066 assert(src_cp->destination() == destination, | |
3067 "first live obj in the space must match the destination"); | |
3068 assert(src_cp->partial_obj_size() == 0, | |
3069 "a space cannot begin with a partial obj"); | |
3070 | |
3071 src_space_id = SpaceId(space_id); | |
3072 src_space_top = space->top(); | |
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3073 const size_t src_region_idx = sd.region(src_cp); |
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3074 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3075 return src_region_idx; |
0 | 3076 } else { |
3077 assert(src_cp->data_size() == 0, "sanity"); | |
3078 } | |
3079 } | |
3080 } | |
3081 } while (++space_id < last_space_id); | |
3082 | |
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3083 assert(false, "no source region was found"); |
0 | 3084 return 0; |
3085 } | |
3086 | |
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3087 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3088 { |
3089 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
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3090 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3091 ParMarkBitMap* const bitmap = mark_bitmap(); |
3092 ParallelCompactData& sd = summary_data(); | |
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3093 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3094 |
3095 // Get the items needed to construct the closure. | |
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3096 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3097 SpaceId dest_space_id = space_id(dest_addr); |
3098 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3099 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3100 assert(dest_addr < new_top, "sanity"); | |
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3101 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3102 |
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3103 // Get the source region and related info. |
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3104 size_t src_region_idx = region_ptr->source_region(); |
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3105 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3106 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3107 | |
3108 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3109 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
375
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3110 |
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3111 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3112 // destination count is not decremented when a region is copied to itself). |
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3113 if (src_region_idx == region_idx) { |
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3114 src_region_idx += 1; |
0 | 3115 } |
3116 | |
3117 if (bitmap->is_unmarked(closure.source())) { | |
3118 // The first source word is in the middle of an object; copy the remainder | |
3119 // of the object or as much as will fit. The fact that pointer updates were | |
3120 // deferred will be noted when the object header is processed. | |
3121 HeapWord* const old_src_addr = closure.source(); | |
3122 closure.copy_partial_obj(); | |
3123 if (closure.is_full()) { | |
495
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3124 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3125 closure.source()); |
375
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3126 region_ptr->set_deferred_obj_addr(NULL); |
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3127 region_ptr->set_completed(); |
0 | 3128 return; |
3129 } | |
3130 | |
375
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3131 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3132 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3133 // The partial object was copied from more than one source region. |
495
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3134 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3135 |
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3136 // Move to the next source region, possibly switching spaces as well. All |
0 | 3137 // args except end_addr may be modified. |
375
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3138 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3139 end_addr); |
0 | 3140 } |
3141 } | |
3142 | |
3143 do { | |
3144 HeapWord* const cur_addr = closure.source(); | |
375
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3145 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3146 src_space_top); |
3147 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3148 | |
3149 if (status == ParMarkBitMap::incomplete) { | |
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3150 // The last obj that starts in the source region does not end in the |
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3151 // region. |
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3152 assert(closure.source() < end_addr, "sanity"); |
0 | 3153 HeapWord* const obj_beg = closure.source(); |
3154 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3155 src_space_top); | |
3156 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3157 if (obj_end < range_end) { | |
3158 // The end was found; the entire object will fit. | |
3159 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3160 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3161 } else { | |
3162 // The end was not found; the object will not fit. | |
3163 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3164 status = ParMarkBitMap::would_overflow; | |
3165 } | |
3166 } | |
3167 | |
3168 if (status == ParMarkBitMap::would_overflow) { | |
3169 // The last object did not fit. Note that interior oop updates were | |
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3170 // deferred, then copy enough of the object to fill the region. |
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3171 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3172 status = closure.copy_until_full(); // copies from closure.source() |
3173 | |
495
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3174 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3175 closure.source()); |
375
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3176 region_ptr->set_completed(); |
0 | 3177 return; |
3178 } | |
3179 | |
3180 if (status == ParMarkBitMap::full) { | |
495
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3181 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3182 closure.source()); |
375
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3183 region_ptr->set_deferred_obj_addr(NULL); |
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3184 region_ptr->set_completed(); |
0 | 3185 return; |
3186 } | |
3187 | |
495
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3188 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3189 |
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3190 // Move to the next source region, possibly switching spaces as well. All |
0 | 3191 // args except end_addr may be modified. |
375
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3192 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3193 end_addr); |
0 | 3194 } while (true); |
3195 } | |
3196 | |
10369
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3197 void PSParallelCompact::fill_blocks(size_t region_idx) |
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3198 { |
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3199 // Fill in the block table elements for the specified region. Each block |
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3200 // table element holds the number of live words in the region that are to the |
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3201 // left of the first object that starts in the block. Thus only blocks in |
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3202 // which an object starts need to be filled. |
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3203 // |
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3204 // The algorithm scans the section of the bitmap that corresponds to the |
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3205 // region, keeping a running total of the live words. When an object start is |
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3206 // found, if it's the first to start in the block that contains it, the |
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3207 // current total is written to the block table element. |
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3208 const size_t Log2BlockSize = ParallelCompactData::Log2BlockSize; |
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3209 const size_t Log2RegionSize = ParallelCompactData::Log2RegionSize; |
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3210 const size_t RegionSize = ParallelCompactData::RegionSize; |
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3211 |
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3212 ParallelCompactData& sd = summary_data(); |
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3213 const size_t partial_obj_size = sd.region(region_idx)->partial_obj_size(); |
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3214 if (partial_obj_size >= RegionSize) { |
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3215 return; // No objects start in this region. |
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3216 } |
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3217 |
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3218 // Ensure the first loop iteration decides that the block has changed. |
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3219 size_t cur_block = sd.block_count(); |
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3220 |
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3221 const ParMarkBitMap* const bitmap = mark_bitmap(); |
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3222 |
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3223 const size_t Log2BitsPerBlock = Log2BlockSize - LogMinObjAlignment; |
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3224 assert((size_t)1 << Log2BitsPerBlock == |
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3225 bitmap->words_to_bits(ParallelCompactData::BlockSize), "sanity"); |
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3226 |
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3227 size_t beg_bit = bitmap->words_to_bits(region_idx << Log2RegionSize); |
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3228 const size_t range_end = beg_bit + bitmap->words_to_bits(RegionSize); |
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3229 size_t live_bits = bitmap->words_to_bits(partial_obj_size); |
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3230 beg_bit = bitmap->find_obj_beg(beg_bit + live_bits, range_end); |
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3231 while (beg_bit < range_end) { |
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3232 const size_t new_block = beg_bit >> Log2BitsPerBlock; |
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3233 if (new_block != cur_block) { |
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3234 cur_block = new_block; |
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3235 sd.block(cur_block)->set_offset(bitmap->bits_to_words(live_bits)); |
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3236 } |
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3237 |
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3238 const size_t end_bit = bitmap->find_obj_end(beg_bit, range_end); |
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3239 if (end_bit < range_end - 1) { |
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3240 live_bits += end_bit - beg_bit + 1; |
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3241 beg_bit = bitmap->find_obj_beg(end_bit + 1, range_end); |
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3242 } else { |
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3243 return; |
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3244 } |
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3245 } |
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3246 } |
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3247 |
0 | 3248 void |
3249 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3250 const MutableSpace* sp = space(space_id); | |
3251 if (sp->is_empty()) { | |
3252 return; | |
3253 } | |
3254 | |
3255 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3256 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3257 HeapWord* const dp_addr = dense_prefix(space_id); | |
3258 HeapWord* beg_addr = sp->bottom(); | |
3259 HeapWord* end_addr = sp->top(); | |
3260 | |
3261 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3262 | |
375
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3263 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3264 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3265 if (beg_region < dp_region) { |
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3266 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3267 } |
3268 | |
375
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3269 // The destination of the first live object that starts in the region is one |
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3270 // past the end of the partial object entering the region (if any). |
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3271 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3272 HeapWord* const new_top = _space_info[space_id].new_top(); |
3273 assert(new_top >= dest_addr, "bad new_top value"); | |
3274 const size_t words = pointer_delta(new_top, dest_addr); | |
3275 | |
3276 if (words > 0) { | |
3277 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3278 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3279 | |
3280 ParMarkBitMap::IterationStatus status; | |
3281 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3282 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3283 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3284 "live objects skipped because closure is full"); | |
3285 } | |
3286 } | |
3287 | |
3288 jlong PSParallelCompact::millis_since_last_gc() { | |
4712
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3289 // We need a monotonically non-deccreasing time in ms but |
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3290 // os::javaTimeMillis() does not guarantee monotonicity. |
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3291 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3292 jlong ret_val = now - _time_of_last_gc; |
0 | 3293 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3294 if (ret_val < 0) { | |
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3295 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3296 return 0; |
3297 } | |
3298 return ret_val; | |
3299 } | |
3300 | |
3301 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3302 // We need a monotonically non-deccreasing time in ms but |
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3303 // os::javaTimeMillis() does not guarantee monotonicity. |
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3304 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3305 } |
3306 | |
3307 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3308 { | |
3309 if (source() != destination()) { | |
495
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3310 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3311 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3312 } | |
3313 update_state(words_remaining()); | |
3314 assert(is_full(), "sanity"); | |
3315 return ParMarkBitMap::full; | |
3316 } | |
3317 | |
3318 void MoveAndUpdateClosure::copy_partial_obj() | |
3319 { | |
3320 size_t words = words_remaining(); | |
3321 | |
3322 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3323 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3324 if (end_addr < range_end) { | |
3325 words = bitmap()->obj_size(source(), end_addr); | |
3326 } | |
3327 | |
3328 // This test is necessary; if omitted, the pointer updates to a partial object | |
3329 // that crosses the dense prefix boundary could be overwritten. | |
3330 if (source() != destination()) { | |
495
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3331 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3332 Copy::aligned_conjoint_words(source(), destination(), words); |
3333 } | |
3334 update_state(words); | |
3335 } | |
3336 | |
3337 ParMarkBitMapClosure::IterationStatus | |
3338 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3339 assert(destination() != NULL, "sanity"); | |
3340 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3341 | |
3342 _source = addr; | |
3343 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3344 destination(), "wrong destination"); | |
3345 | |
3346 if (words > words_remaining()) { | |
3347 return ParMarkBitMap::would_overflow; | |
3348 } | |
3349 | |
3350 // The start_array must be updated even if the object is not moving. | |
3351 if (_start_array != NULL) { | |
3352 _start_array->allocate_block(destination()); | |
3353 } | |
3354 | |
3355 if (destination() != source()) { | |
495
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3356 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3357 Copy::aligned_conjoint_words(source(), destination(), words); |
3358 } | |
3359 | |
3360 oop moved_oop = (oop) destination(); | |
3361 moved_oop->update_contents(compaction_manager()); | |
3362 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3363 | |
3364 update_state(words); | |
3365 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3366 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3367 } | |
3368 | |
3369 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3370 ParCompactionManager* cm, | |
3371 PSParallelCompact::SpaceId space_id) : | |
3372 ParMarkBitMapClosure(mbm, cm), | |
3373 _space_id(space_id), | |
3374 _start_array(PSParallelCompact::start_array(space_id)) | |
3375 { | |
3376 } | |
3377 | |
3378 // Updates the references in the object to their new values. | |
3379 ParMarkBitMapClosure::IterationStatus | |
3380 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3381 do_addr(addr); | |
3382 return ParMarkBitMap::incomplete; | |
3383 } |