Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 17762:fd54db8eb0df
8020277: Young GC could be extremely slow due to assertion in ObjectStartArray::object_starts_in_range
8009462: Young GC's (ParNewGC and SerialGC) have unexpected variances.
Summary: Removed the assertion slowing down GC.
Reviewed-by: stefank, mgerdin
author | sjohanss |
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date | Mon, 20 Jan 2014 12:56:18 +0100 |
parents | ad72068ac41e |
children | 63a4eb8bcd23 270d7cb38f40 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/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 | |
64 // All sizes are in HeapWords. | |
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65 const size_t ParallelCompactData::Log2RegionSize = 16; // 64K words |
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66 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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67 const size_t ParallelCompactData::RegionSizeBytes = |
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68 RegionSize << LogHeapWordSize; |
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69 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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70 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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71 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
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72 |
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73 const size_t ParallelCompactData::Log2BlockSize = 7; // 128 words |
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74 const size_t ParallelCompactData::BlockSize = (size_t)1 << Log2BlockSize; |
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75 const size_t ParallelCompactData::BlockSizeBytes = |
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76 BlockSize << LogHeapWordSize; |
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77 const size_t ParallelCompactData::BlockSizeOffsetMask = BlockSize - 1; |
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78 const size_t ParallelCompactData::BlockAddrOffsetMask = BlockSizeBytes - 1; |
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79 const size_t ParallelCompactData::BlockAddrMask = ~BlockAddrOffsetMask; |
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80 |
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81 const size_t ParallelCompactData::BlocksPerRegion = RegionSize / BlockSize; |
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82 const size_t ParallelCompactData::Log2BlocksPerRegion = |
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83 Log2RegionSize - Log2BlockSize; |
0 | 84 |
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85 const ParallelCompactData::RegionData::region_sz_t |
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86 ParallelCompactData::RegionData::dc_shift = 27; |
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87 |
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88 const ParallelCompactData::RegionData::region_sz_t |
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89 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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90 |
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91 const ParallelCompactData::RegionData::region_sz_t |
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92 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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93 |
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94 const ParallelCompactData::RegionData::region_sz_t |
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95 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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96 |
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97 const ParallelCompactData::RegionData::region_sz_t |
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98 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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99 |
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100 const ParallelCompactData::RegionData::region_sz_t |
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101 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 102 |
103 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
104 bool PSParallelCompact::_print_phases = false; | |
105 | |
106 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
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107 Klass* PSParallelCompact::_updated_int_array_klass_obj = NULL; |
0 | 108 |
109 double PSParallelCompact::_dwl_mean; | |
110 double PSParallelCompact::_dwl_std_dev; | |
111 double PSParallelCompact::_dwl_first_term; | |
112 double PSParallelCompact::_dwl_adjustment; | |
113 #ifdef ASSERT | |
114 bool PSParallelCompact::_dwl_initialized = false; | |
115 #endif // #ifdef ASSERT | |
116 | |
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117 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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118 HeapWord* destination) |
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119 { |
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120 assert(src_region_idx != 0, "invalid src_region_idx"); |
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121 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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122 assert(destination != NULL, "invalid destination argument"); |
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123 |
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124 _src_region_idx = src_region_idx; |
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125 _partial_obj_size = partial_obj_size; |
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126 _destination = destination; |
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127 |
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128 // These fields may not be updated below, so make sure they're clear. |
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129 assert(_dest_region_addr == NULL, "should have been cleared"); |
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130 assert(_first_src_addr == NULL, "should have been cleared"); |
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131 |
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132 // Determine the number of destination regions for the partial object. |
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133 HeapWord* const last_word = destination + partial_obj_size - 1; |
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134 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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135 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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136 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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137 |
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138 if (beg_region_addr == end_region_addr) { |
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139 // One destination region. |
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140 _destination_count = 1; |
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141 if (end_region_addr == destination) { |
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142 // The destination falls on a region boundary, thus the first word of the |
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143 // partial object will be the first word copied to the destination region. |
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144 _dest_region_addr = end_region_addr; |
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145 _first_src_addr = sd.region_to_addr(src_region_idx); |
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146 } |
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147 } else { |
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148 // Two destination regions. When copied, the partial object will cross a |
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149 // destination region boundary, so a word somewhere within the partial |
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150 // object will be the first word copied to the second destination region. |
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151 _destination_count = 2; |
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152 _dest_region_addr = end_region_addr; |
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153 const size_t ofs = pointer_delta(end_region_addr, destination); |
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154 assert(ofs < _partial_obj_size, "sanity"); |
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155 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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156 } |
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157 } |
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158 |
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159 void SplitInfo::clear() |
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160 { |
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161 _src_region_idx = 0; |
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162 _partial_obj_size = 0; |
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163 _destination = NULL; |
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164 _destination_count = 0; |
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165 _dest_region_addr = NULL; |
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166 _first_src_addr = NULL; |
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167 assert(!is_valid(), "sanity"); |
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168 } |
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169 |
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170 #ifdef ASSERT |
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171 void SplitInfo::verify_clear() |
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172 { |
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173 assert(_src_region_idx == 0, "not clear"); |
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174 assert(_partial_obj_size == 0, "not clear"); |
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175 assert(_destination == NULL, "not clear"); |
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176 assert(_destination_count == 0, "not clear"); |
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177 assert(_dest_region_addr == NULL, "not clear"); |
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178 assert(_first_src_addr == NULL, "not clear"); |
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179 } |
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180 #endif // #ifdef ASSERT |
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181 |
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182 |
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183 void PSParallelCompact::print_on_error(outputStream* st) { |
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184 _mark_bitmap.print_on_error(st); |
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185 } |
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186 |
0 | 187 #ifndef PRODUCT |
188 const char* PSParallelCompact::space_names[] = { | |
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189 "old ", "eden", "from", "to " |
0 | 190 }; |
191 | |
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192 void PSParallelCompact::print_region_ranges() |
0 | 193 { |
194 tty->print_cr("space bottom top end new_top"); | |
195 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
196 | |
197 for (unsigned int id = 0; id < last_space_id; ++id) { | |
198 const MutableSpace* space = _space_info[id].space(); | |
199 tty->print_cr("%u %s " | |
264
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200 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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201 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 202 id, space_names[id], |
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203 summary_data().addr_to_region_idx(space->bottom()), |
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204 summary_data().addr_to_region_idx(space->top()), |
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205 summary_data().addr_to_region_idx(space->end()), |
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206 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 207 } |
208 } | |
209 | |
210 void | |
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211 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 212 { |
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213 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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214 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 215 |
216 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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217 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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218 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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219 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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220 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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221 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 222 i, c->data_location(), dci, c->destination(), |
223 c->partial_obj_size(), c->live_obj_size(), | |
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224 c->data_size(), c->source_region(), c->destination_count()); |
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225 |
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226 #undef REGION_IDX_FORMAT |
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227 #undef REGION_DATA_FORMAT |
0 | 228 } |
229 | |
230 void | |
231 print_generic_summary_data(ParallelCompactData& summary_data, | |
232 HeapWord* const beg_addr, | |
233 HeapWord* const end_addr) | |
234 { | |
235 size_t total_words = 0; | |
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236 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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237 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 238 HeapWord* pdest = 0; |
239 | |
240 while (i <= last) { | |
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241 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 242 if (c->data_size() != 0 || c->destination() != pdest) { |
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243 print_generic_summary_region(i, c); |
0 | 244 total_words += c->data_size(); |
245 pdest = c->destination(); | |
246 } | |
247 ++i; | |
248 } | |
249 | |
250 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
251 } | |
252 | |
253 void | |
254 print_generic_summary_data(ParallelCompactData& summary_data, | |
255 SpaceInfo* space_info) | |
256 { | |
257 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
258 const MutableSpace* space = space_info[id].space(); | |
259 print_generic_summary_data(summary_data, space->bottom(), | |
260 MAX2(space->top(), space_info[id].new_top())); | |
261 } | |
262 } | |
263 | |
264 void | |
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265 print_initial_summary_region(size_t i, |
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266 const ParallelCompactData::RegionData* c, |
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267 bool newline = true) |
0 | 268 { |
264
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269 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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270 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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271 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 272 i, c->destination(), |
273 c->partial_obj_size(), c->live_obj_size(), | |
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274 c->data_size(), c->source_region(), c->destination_count()); |
0 | 275 if (newline) tty->cr(); |
276 } | |
277 | |
278 void | |
279 print_initial_summary_data(ParallelCompactData& summary_data, | |
280 const MutableSpace* space) { | |
281 if (space->top() == space->bottom()) { | |
282 return; | |
283 } | |
284 | |
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285 const size_t region_size = ParallelCompactData::RegionSize; |
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286 typedef ParallelCompactData::RegionData RegionData; |
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287 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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288 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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289 const RegionData* c = summary_data.region(end_region - 1); |
0 | 290 HeapWord* end_addr = c->destination() + c->data_size(); |
291 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
292 | |
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293 // Print (and count) the full regions at the beginning of the space. |
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294 size_t full_region_count = 0; |
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295 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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296 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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297 print_initial_summary_region(i, summary_data.region(i)); |
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298 ++full_region_count; |
0 | 299 ++i; |
300 } | |
301 | |
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302 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 303 |
304 double max_reclaimed_ratio = 0.0; | |
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305 size_t max_reclaimed_ratio_region = 0; |
0 | 306 size_t max_dead_to_right = 0; |
307 size_t max_live_to_right = 0; | |
308 | |
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309 // Print the 'reclaimed ratio' for regions while there is something live in |
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310 // the region or to the right of it. The remaining regions are empty (and |
0 | 311 // uninteresting), and computing the ratio will result in division by 0. |
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312 while (i < end_region && live_to_right > 0) { |
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313 c = summary_data.region(i); |
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314 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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315 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 316 const size_t dead_to_right = used_to_right - live_to_right; |
317 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
318 | |
319 if (reclaimed_ratio > max_reclaimed_ratio) { | |
320 max_reclaimed_ratio = reclaimed_ratio; | |
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321 max_reclaimed_ratio_region = i; |
0 | 322 max_dead_to_right = dead_to_right; |
323 max_live_to_right = live_to_right; | |
324 } | |
325 | |
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326 print_initial_summary_region(i, c, false); |
264
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327 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 328 reclaimed_ratio, dead_to_right, live_to_right); |
329 | |
330 live_to_right -= c->data_size(); | |
331 ++i; | |
332 } | |
333 | |
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334 // Any remaining regions are empty. Print one more if there is one. |
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335 if (i < end_region) { |
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336 print_initial_summary_region(i, summary_data.region(i)); |
0 | 337 } |
338 | |
264
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339 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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340 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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341 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 342 max_live_to_right, max_reclaimed_ratio); |
343 } | |
344 | |
345 void | |
346 print_initial_summary_data(ParallelCompactData& summary_data, | |
347 SpaceInfo* space_info) { | |
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348 unsigned int id = PSParallelCompact::old_space_id; |
0 | 349 const MutableSpace* space; |
350 do { | |
351 space = space_info[id].space(); | |
352 print_initial_summary_data(summary_data, space); | |
353 } while (++id < PSParallelCompact::eden_space_id); | |
354 | |
355 do { | |
356 space = space_info[id].space(); | |
357 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
358 } while (++id < PSParallelCompact::last_space_id); | |
359 } | |
360 #endif // #ifndef PRODUCT | |
361 | |
362 #ifdef ASSERT | |
363 size_t add_obj_count; | |
364 size_t add_obj_size; | |
365 size_t mark_bitmap_count; | |
366 size_t mark_bitmap_size; | |
367 #endif // #ifdef ASSERT | |
368 | |
369 ParallelCompactData::ParallelCompactData() | |
370 { | |
371 _region_start = 0; | |
372 | |
375
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373 _region_vspace = 0; |
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374 _reserved_byte_size = 0; |
375
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375 _region_data = 0; |
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376 _region_count = 0; |
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377 |
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378 _block_vspace = 0; |
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379 _block_data = 0; |
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380 _block_count = 0; |
0 | 381 } |
382 | |
383 bool ParallelCompactData::initialize(MemRegion covered_region) | |
384 { | |
385 _region_start = covered_region.start(); | |
386 const size_t region_size = covered_region.word_size(); | |
387 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
388 | |
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389 assert(region_align_down(_region_start) == _region_start, |
0 | 390 "region start not aligned"); |
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391 assert((region_size & RegionSizeOffsetMask) == 0, |
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392 "region size not a multiple of RegionSize"); |
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393 |
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394 bool result = initialize_region_data(region_size) && initialize_block_data(); |
0 | 395 return result; |
396 } | |
397 | |
398 PSVirtualSpace* | |
399 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
400 { | |
401 const size_t raw_bytes = count * element_size; | |
402 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
403 const size_t granularity = os::vm_allocation_granularity(); | |
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404 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
0 | 405 |
406 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
407 MAX2(page_sz, granularity); | |
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408 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
0 | 409 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
410 rs.size()); | |
6197 | 411 |
412 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
413 | |
0 | 414 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
415 if (vspace != 0) { | |
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416 if (vspace->expand_by(_reserved_byte_size)) { |
0 | 417 return vspace; |
418 } | |
419 delete vspace; | |
237
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420 // Release memory reserved in the space. |
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421 rs.release(); |
0 | 422 } |
423 | |
424 return 0; | |
425 } | |
426 | |
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427 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 428 { |
375
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429 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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430 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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431 if (_region_vspace != 0) { |
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432 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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433 _region_count = count; |
0 | 434 return true; |
435 } | |
436 return false; | |
437 } | |
438 | |
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439 bool ParallelCompactData::initialize_block_data() |
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440 { |
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441 assert(_region_count != 0, "region data must be initialized first"); |
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442 const size_t count = _region_count << Log2BlocksPerRegion; |
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443 _block_vspace = create_vspace(count, sizeof(BlockData)); |
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444 if (_block_vspace != 0) { |
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445 _block_data = (BlockData*)_block_vspace->reserved_low_addr(); |
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446 _block_count = count; |
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447 return true; |
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448 } |
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449 return false; |
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450 } |
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451 |
0 | 452 void ParallelCompactData::clear() |
453 { | |
375
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454 memset(_region_data, 0, _region_vspace->committed_size()); |
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455 memset(_block_data, 0, _block_vspace->committed_size()); |
0 | 456 } |
457 | |
375
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458 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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459 assert(beg_region <= _region_count, "beg_region out of range"); |
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460 assert(end_region <= _region_count, "end_region out of range"); |
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461 assert(RegionSize % BlockSize == 0, "RegionSize not a multiple of BlockSize"); |
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462 |
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463 const size_t region_cnt = end_region - beg_region; |
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464 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
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465 |
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466 const size_t beg_block = beg_region * BlocksPerRegion; |
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467 const size_t block_cnt = region_cnt * BlocksPerRegion; |
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468 memset(_block_data + beg_block, 0, block_cnt * sizeof(BlockData)); |
0 | 469 } |
470 | |
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471 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 472 { |
375
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473 const RegionData* cur_cp = region(region_idx); |
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474 const RegionData* const end_cp = region(region_count() - 1); |
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475 |
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476 HeapWord* result = region_to_addr(region_idx); |
0 | 477 if (cur_cp < end_cp) { |
478 do { | |
479 result += cur_cp->partial_obj_size(); | |
375
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480 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 481 } |
482 return result; | |
483 } | |
484 | |
485 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
486 { | |
487 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
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488 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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489 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 490 |
491 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
492 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
493 | |
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494 if (beg_region == end_region) { |
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495 // All in one region. |
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496 _region_data[beg_region].add_live_obj(len); |
0 | 497 return; |
498 } | |
499 | |
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500 // First region. |
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501 const size_t beg_ofs = region_offset(addr); |
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502 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 503 |
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504 Klass* klass = ((oop)addr)->klass(); |
375
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505 // Middle regions--completely spanned by this object. |
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506 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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507 _region_data[region].set_partial_obj_size(RegionSize); |
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508 _region_data[region].set_partial_obj_addr(addr); |
0 | 509 } |
510 | |
375
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511 // Last region. |
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512 const size_t end_ofs = region_offset(addr + len - 1); |
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513 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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514 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 515 } |
516 | |
517 void | |
518 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
519 { | |
375
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520 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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521 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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522 |
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523 size_t cur_region = addr_to_region_idx(beg); |
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524 const size_t end_region = addr_to_region_idx(end); |
0 | 525 HeapWord* addr = beg; |
375
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526 while (cur_region < end_region) { |
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527 _region_data[cur_region].set_destination(addr); |
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528 _region_data[cur_region].set_destination_count(0); |
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529 _region_data[cur_region].set_source_region(cur_region); |
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530 _region_data[cur_region].set_data_location(addr); |
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531 |
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532 // Update live_obj_size so the region appears completely full. |
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533 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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534 _region_data[cur_region].set_live_obj_size(live_size); |
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535 |
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536 ++cur_region; |
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537 addr += RegionSize; |
0 | 538 } |
539 } | |
540 | |
482
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541 // Find the point at which a space can be split and, if necessary, record the |
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542 // split point. |
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543 // |
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544 // If the current src region (which overflowed the destination space) doesn't |
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545 // have a partial object, the split point is at the beginning of the current src |
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546 // region (an "easy" split, no extra bookkeeping required). |
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547 // |
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548 // If the current src region has a partial object, the split point is in the |
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549 // region where that partial object starts (call it the split_region). If |
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550 // split_region has a partial object, then the split point is just after that |
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551 // partial object (a "hard" split where we have to record the split data and |
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552 // zero the partial_obj_size field). With a "hard" split, we know that the |
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553 // partial_obj ends within split_region because the partial object that caused |
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554 // the overflow starts in split_region. If split_region doesn't have a partial |
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555 // obj, then the split is at the beginning of split_region (another "easy" |
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556 // split). |
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557 HeapWord* |
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558 ParallelCompactData::summarize_split_space(size_t src_region, |
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559 SplitInfo& split_info, |
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560 HeapWord* destination, |
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561 HeapWord* target_end, |
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562 HeapWord** target_next) |
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563 { |
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564 assert(destination <= target_end, "sanity"); |
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565 assert(destination + _region_data[src_region].data_size() > target_end, |
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566 "region should not fit into target space"); |
696
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567 assert(is_region_aligned(target_end), "sanity"); |
482
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568 |
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569 size_t split_region = src_region; |
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570 HeapWord* split_destination = destination; |
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571 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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572 |
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573 if (destination + partial_obj_size > target_end) { |
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574 // The split point is just after the partial object (if any) in the |
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575 // src_region that contains the start of the object that overflowed the |
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576 // destination space. |
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577 // |
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578 // Find the start of the "overflow" object and set split_region to the |
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579 // region containing it. |
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580 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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581 split_region = addr_to_region_idx(overflow_obj); |
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582 |
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583 // Clear the source_region field of all destination regions whose first word |
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584 // came from data after the split point (a non-null source_region field |
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585 // implies a region must be filled). |
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586 // |
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587 // An alternative to the simple loop below: clear during post_compact(), |
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588 // which uses memcpy instead of individual stores, and is easy to |
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589 // parallelize. (The downside is that it clears the entire RegionData |
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590 // object as opposed to just one field.) |
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591 // |
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592 // post_compact() would have to clear the summary data up to the highest |
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593 // address that was written during the summary phase, which would be |
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594 // |
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595 // max(top, max(new_top, clear_top)) |
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596 // |
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597 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
696
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598 // to target_end. |
482
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599 const RegionData* const sr = region(split_region); |
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600 const size_t beg_idx = |
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601 addr_to_region_idx(region_align_up(sr->destination() + |
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602 sr->partial_obj_size())); |
696
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603 const size_t end_idx = addr_to_region_idx(target_end); |
482
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604 |
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605 if (TraceParallelOldGCSummaryPhase) { |
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606 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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607 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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608 beg_idx, end_idx); |
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609 } |
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610 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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611 _region_data[idx].set_source_region(0); |
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612 } |
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613 |
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614 // Set split_destination and partial_obj_size to reflect the split region. |
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615 split_destination = sr->destination(); |
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616 partial_obj_size = sr->partial_obj_size(); |
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617 } |
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618 |
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619 // The split is recorded only if a partial object extends onto the region. |
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620 if (partial_obj_size != 0) { |
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621 _region_data[split_region].set_partial_obj_size(0); |
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622 split_info.record(split_region, partial_obj_size, split_destination); |
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623 } |
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624 |
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625 // Setup the continuation addresses. |
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626 *target_next = split_destination + partial_obj_size; |
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627 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 628 |
629 if (TraceParallelOldGCSummaryPhase) { | |
482
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630 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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631 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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632 " pos=" SIZE_FORMAT, |
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633 split_type, source_next, split_region, |
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634 partial_obj_size); |
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635 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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636 " tn=" PTR_FORMAT, |
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637 split_type, split_destination, |
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638 addr_to_region_idx(split_destination), |
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639 *target_next); |
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640 |
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641 if (partial_obj_size != 0) { |
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642 HeapWord* const po_beg = split_info.destination(); |
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643 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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644 gclog_or_tty->print_cr("%s split: " |
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645 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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646 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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647 split_type, |
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648 po_beg, addr_to_region_idx(po_beg), |
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649 po_end, addr_to_region_idx(po_end)); |
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650 } |
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651 } |
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652 |
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653 return source_next; |
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654 } |
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655 |
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656 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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657 HeapWord* source_beg, HeapWord* source_end, |
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658 HeapWord** source_next, |
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659 HeapWord* target_beg, HeapWord* target_end, |
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660 HeapWord** target_next) |
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661 { |
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662 if (TraceParallelOldGCSummaryPhase) { |
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663 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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664 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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665 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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666 source_beg, source_end, source_next_val, |
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667 target_beg, target_end, *target_next); |
0 | 668 } |
669 | |
375
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670 size_t cur_region = addr_to_region_idx(source_beg); |
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671 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 672 |
673 HeapWord *dest_addr = target_beg; | |
375
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674 while (cur_region < end_region) { |
482
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675 // The destination must be set even if the region has no data. |
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676 _region_data[cur_region].set_destination(dest_addr); |
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677 |
375
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678 size_t words = _region_data[cur_region].data_size(); |
0 | 679 if (words > 0) { |
482
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680 // If cur_region does not fit entirely into the target space, find a point |
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681 // at which the source space can be 'split' so that part is copied to the |
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682 // target space and the rest is copied elsewhere. |
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683 if (dest_addr + words > target_end) { |
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684 assert(source_next != NULL, "source_next is NULL when splitting"); |
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685 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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686 target_end, target_next); |
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|
687 return false; |
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|
688 } |
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|
689 |
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|
690 // Compute the destination_count for cur_region, and if necessary, update |
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|
691 // source_region for a destination region. The source_region field is |
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692 // updated if cur_region is the first (left-most) region to be copied to a |
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693 // destination region. |
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|
694 // |
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695 // The destination_count calculation is a bit subtle. A region that has |
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696 // data that compacts into itself does not count itself as a destination. |
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697 // This maintains the invariant that a zero count means the region is |
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|
698 // available and can be claimed and then filled. |
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699 uint destination_count = 0; |
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700 if (split_info.is_split(cur_region)) { |
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701 // The current region has been split: the partial object will be copied |
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702 // to one destination space and the remaining data will be copied to |
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|
703 // another destination space. Adjust the initial destination_count and, |
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|
704 // if necessary, set the source_region field if the partial object will |
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|
705 // cross a destination region boundary. |
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|
706 destination_count = split_info.destination_count(); |
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707 if (destination_count == 2) { |
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|
708 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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709 _region_data[dest_idx].set_source_region(cur_region); |
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|
710 } |
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|
711 } |
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|
712 |
0 | 713 HeapWord* const last_addr = dest_addr + words - 1; |
375
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714 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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715 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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|
716 |
375
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|
717 // Initially assume that the destination regions will be the same and |
0 | 718 // adjust the value below if necessary. Under this assumption, if |
375
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719 // cur_region == dest_region_2, then cur_region will be compacted |
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|
720 // completely into itself. |
482
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|
721 destination_count += cur_region == dest_region_2 ? 0 : 1; |
375
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|
722 if (dest_region_1 != dest_region_2) { |
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723 // Destination regions differ; adjust destination_count. |
0 | 724 destination_count += 1; |
375
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725 // Data from cur_region will be copied to the start of dest_region_2. |
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726 _region_data[dest_region_2].set_source_region(cur_region); |
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727 } else if (region_offset(dest_addr) == 0) { |
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|
728 // Data from cur_region will be copied to the start of the destination |
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changeset
|
729 // region. |
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|
730 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 731 } |
732 | |
375
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733 _region_data[cur_region].set_destination_count(destination_count); |
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734 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 735 dest_addr += words; |
736 } | |
737 | |
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738 ++cur_region; |
0 | 739 } |
740 | |
741 *target_next = dest_addr; | |
742 return true; | |
743 } | |
744 | |
745 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
746 assert(addr != NULL, "Should detect NULL oop earlier"); | |
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747 assert(PSParallelCompact::gc_heap()->is_in(addr), "not in heap"); |
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748 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "not marked"); |
0 | 749 |
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750 // Region covering the object. |
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751 RegionData* const region_ptr = addr_to_region_ptr(addr); |
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752 HeapWord* result = region_ptr->destination(); |
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753 |
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754 // If the entire Region is live, the new location is region->destination + the |
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755 // offset of the object within in the Region. |
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756 |
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757 // Run some performance tests to determine if this special case pays off. It |
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758 // is worth it for pointers into the dense prefix. If the optimization to |
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759 // avoid pointer updates in regions that only point to the dense prefix is |
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760 // ever implemented, this should be revisited. |
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761 if (region_ptr->data_size() == RegionSize) { |
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762 result += region_offset(addr); |
0 | 763 return result; |
764 } | |
765 | |
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766 // Otherwise, the new location is region->destination + block offset + the |
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767 // number of live words in the Block that are (a) to the left of addr and (b) |
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768 // due to objects that start in the Block. |
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769 |
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770 // Fill in the block table if necessary. This is unsynchronized, so multiple |
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771 // threads may fill the block table for a region (harmless, since it is |
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772 // idempotent). |
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773 if (!region_ptr->blocks_filled()) { |
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774 PSParallelCompact::fill_blocks(addr_to_region_idx(addr)); |
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775 region_ptr->set_blocks_filled(); |
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776 } |
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777 |
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778 HeapWord* const search_start = block_align_down(addr); |
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779 const size_t block_offset = addr_to_block_ptr(addr)->offset(); |
0 | 780 |
781 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
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782 const size_t live = bitmap->live_words_in_range(search_start, oop(addr)); |
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783 result += block_offset + live; |
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784 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result)); |
0 | 785 return result; |
786 } | |
787 | |
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788 #ifdef ASSERT |
0 | 789 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) |
790 { | |
791 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
792 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
793 for (const size_t* p = beg; p < end; ++p) { | |
794 assert(*p == 0, "not zero"); | |
795 } | |
796 } | |
797 | |
798 void ParallelCompactData::verify_clear() | |
799 { | |
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800 verify_clear(_region_vspace); |
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801 verify_clear(_block_vspace); |
0 | 802 } |
803 #endif // #ifdef ASSERT | |
804 | |
10405 | 805 STWGCTimer PSParallelCompact::_gc_timer; |
806 ParallelOldTracer PSParallelCompact::_gc_tracer; | |
0 | 807 elapsedTimer PSParallelCompact::_accumulated_time; |
808 unsigned int PSParallelCompact::_total_invocations = 0; | |
809 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
810 jlong PSParallelCompact::_time_of_last_gc = 0; | |
811 CollectorCounters* PSParallelCompact::_counters = NULL; | |
812 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
813 ParallelCompactData PSParallelCompact::_summary_data; | |
814 | |
815 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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816 |
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817 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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818 |
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819 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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820 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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821 |
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822 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure; |
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823 PSParallelCompact::AdjustKlassClosure PSParallelCompact::_adjust_klass_closure; |
0 | 824 |
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825 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); } |
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826 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); } |
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827 |
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828 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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829 |
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830 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { |
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831 mark_and_push(_compaction_manager, p); |
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832 } |
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833 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 834 |
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835 void PSParallelCompact::FollowKlassClosure::do_klass(Klass* klass) { |
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836 klass->oops_do(_mark_and_push_closure); |
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837 } |
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838 void PSParallelCompact::AdjustKlassClosure::do_klass(Klass* klass) { |
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839 klass->oops_do(&PSParallelCompact::_adjust_pointer_closure); |
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840 } |
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841 |
0 | 842 void PSParallelCompact::post_initialize() { |
843 ParallelScavengeHeap* heap = gc_heap(); | |
844 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
845 | |
846 MemRegion mr = heap->reserved_region(); | |
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847 _ref_processor = |
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848 new ReferenceProcessor(mr, // span |
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849 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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850 (int) ParallelGCThreads, // mt processing degree |
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851 true, // mt discovery |
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852 (int) ParallelGCThreads, // mt discovery degree |
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853 true, // atomic_discovery |
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854 &_is_alive_closure, // non-header is alive closure |
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855 false); // write barrier for next field updates |
0 | 856 _counters = new CollectorCounters("PSParallelCompact", 1); |
857 | |
858 // Initialize static fields in ParCompactionManager. | |
859 ParCompactionManager::initialize(mark_bitmap()); | |
860 } | |
861 | |
862 bool PSParallelCompact::initialize() { | |
863 ParallelScavengeHeap* heap = gc_heap(); | |
864 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
865 MemRegion mr = heap->reserved_region(); | |
866 | |
867 // Was the old gen get allocated successfully? | |
868 if (!heap->old_gen()->is_allocated()) { | |
869 return false; | |
870 } | |
871 | |
872 initialize_space_info(); | |
873 initialize_dead_wood_limiter(); | |
874 | |
875 if (!_mark_bitmap.initialize(mr)) { | |
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876 vm_shutdown_during_initialization( |
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877 err_msg("Unable to allocate " SIZE_FORMAT "KB bitmaps for parallel " |
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878 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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879 _mark_bitmap.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 880 return false; |
881 } | |
882 | |
883 if (!_summary_data.initialize(mr)) { | |
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884 vm_shutdown_during_initialization( |
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885 err_msg("Unable to allocate " SIZE_FORMAT "KB card tables for parallel " |
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886 "garbage collection for the requested " SIZE_FORMAT "KB heap.", |
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887 _summary_data.reserved_byte_size()/K, mr.byte_size()/K)); |
0 | 888 return false; |
889 } | |
890 | |
891 return true; | |
892 } | |
893 | |
894 void PSParallelCompact::initialize_space_info() | |
895 { | |
896 memset(&_space_info, 0, sizeof(_space_info)); | |
897 | |
898 ParallelScavengeHeap* heap = gc_heap(); | |
899 PSYoungGen* young_gen = heap->young_gen(); | |
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900 |
0 | 901 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
902 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
903 _space_info[from_space_id].set_space(young_gen->from_space()); | |
904 _space_info[to_space_id].set_space(young_gen->to_space()); | |
905 | |
906 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
907 } | |
908 | |
909 void PSParallelCompact::initialize_dead_wood_limiter() | |
910 { | |
911 const size_t max = 100; | |
912 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
913 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
914 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
915 DEBUG_ONLY(_dwl_initialized = true;) | |
916 _dwl_adjustment = normal_distribution(1.0); | |
917 } | |
918 | |
919 // Simple class for storing info about the heap at the start of GC, to be used | |
920 // after GC for comparison/printing. | |
921 class PreGCValues { | |
922 public: | |
923 PreGCValues() { } | |
924 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
925 | |
926 void fill(ParallelScavengeHeap* heap) { | |
927 _heap_used = heap->used(); | |
928 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
929 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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930 _metadata_used = MetaspaceAux::allocated_used_bytes(); |
0 | 931 }; |
932 | |
933 size_t heap_used() const { return _heap_used; } | |
934 size_t young_gen_used() const { return _young_gen_used; } | |
935 size_t old_gen_used() const { return _old_gen_used; } | |
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936 size_t metadata_used() const { return _metadata_used; } |
0 | 937 |
938 private: | |
939 size_t _heap_used; | |
940 size_t _young_gen_used; | |
941 size_t _old_gen_used; | |
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942 size_t _metadata_used; |
0 | 943 }; |
944 | |
945 void | |
946 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
947 { | |
948 // At this point, top is the value before GC, new_top() is the value that will | |
949 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
950 // should be marked above top. The summary data is cleared to the larger of | |
951 // top & new_top. | |
952 MutableSpace* const space = _space_info[id].space(); | |
953 HeapWord* const bot = space->bottom(); | |
954 HeapWord* const top = space->top(); | |
955 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
956 | |
957 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
958 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
959 _mark_bitmap.clear_range(beg_bit, end_bit); | |
960 | |
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961 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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962 const size_t end_region = |
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963 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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964 _summary_data.clear_range(beg_region, end_region); |
482
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965 |
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966 // Clear the data used to 'split' regions. |
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967 SplitInfo& split_info = _space_info[id].split_info(); |
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968 if (split_info.is_valid()) { |
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969 split_info.clear(); |
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970 } |
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971 DEBUG_ONLY(split_info.verify_clear();) |
0 | 972 } |
973 | |
974 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
975 { | |
976 // Update the from & to space pointers in space_info, since they are swapped | |
977 // at each young gen gc. Do the update unconditionally (even though a | |
978 // promotion failure does not swap spaces) because an unknown number of minor | |
979 // collections will have swapped the spaces an unknown number of times. | |
10405 | 980 GCTraceTime tm("pre compact", print_phases(), true, &_gc_timer); |
0 | 981 ParallelScavengeHeap* heap = gc_heap(); |
982 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
983 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
984 | |
985 pre_gc_values->fill(heap); | |
986 | |
987 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
988 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
989 | |
990 // Increment the invocation count | |
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991 heap->increment_total_collections(true); |
0 | 992 |
993 // We need to track unique mark sweep invocations as well. | |
994 _total_invocations++; | |
995 | |
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996 heap->print_heap_before_gc(); |
10405 | 997 heap->trace_heap_before_gc(&_gc_tracer); |
0 | 998 |
999 // Fill in TLABs | |
1000 heap->accumulate_statistics_all_tlabs(); | |
1001 heap->ensure_parsability(true); // retire TLABs | |
1002 | |
1003 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
1004 HandleMark hm; // Discard invalid handles created during verification | |
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1005 Universe::verify(" VerifyBeforeGC:"); |
0 | 1006 } |
1007 | |
1008 // Verify object start arrays | |
1009 if (VerifyObjectStartArray && | |
1010 VerifyBeforeGC) { | |
1011 heap->old_gen()->verify_object_start_array(); | |
1012 } | |
1013 | |
1014 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
1015 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 1016 |
1017 // Have worker threads release resources the next time they run a task. | |
1018 gc_task_manager()->release_all_resources(); | |
0 | 1019 } |
1020 | |
1021 void PSParallelCompact::post_compact() | |
1022 { | |
10405 | 1023 GCTraceTime tm("post compact", print_phases(), true, &_gc_timer); |
0 | 1024 |
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1025 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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1026 // Clear the marking bitmap, summary data and split info. |
0 | 1027 clear_data_covering_space(SpaceId(id)); |
482
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1028 // Update top(). Must be done after clearing the bitmap and summary data. |
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1029 _space_info[id].publish_new_top(); |
0 | 1030 } |
1031 | |
1032 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1033 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1034 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1035 | |
1036 ParallelScavengeHeap* heap = gc_heap(); | |
1037 bool eden_empty = eden_space->is_empty(); | |
1038 if (!eden_empty) { | |
1039 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1040 heap->young_gen(), heap->old_gen()); | |
1041 } | |
1042 | |
1043 // Update heap occupancy information which is used as input to the soft ref | |
1044 // clearing policy at the next gc. | |
1045 Universe::update_heap_info_at_gc(); | |
1046 | |
1047 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1048 to_space->is_empty(); | |
1049 | |
1050 BarrierSet* bs = heap->barrier_set(); | |
1051 if (bs->is_a(BarrierSet::ModRef)) { | |
1052 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1053 MemRegion old_mr = heap->old_gen()->reserved(); | |
1054 | |
1055 if (young_gen_empty) { | |
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1056 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1057 } else { |
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1058 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1059 } |
1060 } | |
1061 | |
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1062 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1063 ClassLoaderDataGraph::purge(); |
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1064 MetaspaceAux::verify_metrics(); |
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1065 |
0 | 1066 Threads::gc_epilogue(); |
1067 CodeCache::gc_epilogue(); | |
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1068 JvmtiExport::gc_epilogue(); |
0 | 1069 |
1070 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1071 | |
1072 ref_processor()->enqueue_discovered_references(NULL); | |
1073 | |
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1074 if (ZapUnusedHeapArea) { |
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1075 heap->gen_mangle_unused_area(); |
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1076 } |
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1077 |
0 | 1078 // Update time of last GC |
1079 reset_millis_since_last_gc(); | |
1080 } | |
1081 | |
1082 HeapWord* | |
1083 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1084 bool maximum_compaction) | |
1085 { | |
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1086 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1087 const ParallelCompactData& sd = summary_data(); |
1088 | |
1089 const MutableSpace* const space = _space_info[id].space(); | |
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1090 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1091 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1092 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1093 |
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1094 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1095 // of the dense prefix. |
1096 size_t full_count = 0; | |
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1097 const RegionData* cp; |
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1098 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1099 ++full_count; |
1100 } | |
1101 | |
1102 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1103 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1104 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1105 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1106 _maximum_compaction_gc_num = total_invocations(); | |
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1107 return sd.region_to_addr(cp); |
0 | 1108 } |
1109 | |
1110 HeapWord* const new_top = _space_info[id].new_top(); | |
1111 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1112 const size_t space_used = space->used_in_words(); | |
1113 const size_t space_capacity = space->capacity_in_words(); | |
1114 | |
1115 const double cur_density = double(space_live) / space_capacity; | |
1116 const double deadwood_density = | |
1117 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1118 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1119 | |
1120 if (TraceParallelOldGCDensePrefix) { | |
1121 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1122 cur_density, deadwood_density, deadwood_goal); | |
1123 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1124 "space_cap=" SIZE_FORMAT, | |
1125 space_live, space_used, | |
1126 space_capacity); | |
1127 } | |
1128 | |
1129 // XXX - Use binary search? | |
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1130 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1131 const RegionData* full_cp = cp; |
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1132 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1133 while (cp < end_cp) { |
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1134 HeapWord* region_destination = cp->destination(); |
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1135 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1136 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1137 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1138 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1139 sd.region(cp), region_destination, |
0 | 1140 dense_prefix, cur_deadwood); |
1141 } | |
1142 | |
1143 if (cur_deadwood >= deadwood_goal) { | |
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1144 // Found the region that has the correct amount of deadwood to the left. |
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1145 // This typically occurs after crossing a fairly sparse set of regions, so |
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1146 // iterate backwards over those sparse regions, looking for the region |
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1147 // that has the lowest density of live objects 'to the right.' |
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1148 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1149 size_t live_to_left = space_to_left - cur_deadwood; |
1150 size_t space_to_right = space_capacity - space_to_left; | |
1151 size_t live_to_right = space_live - live_to_left; | |
1152 double density_to_right = double(live_to_right) / space_to_right; | |
1153 while (cp > full_cp) { | |
1154 --cp; | |
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1155 const size_t prev_region_live_to_right = live_to_right - |
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1156 cp->data_size(); |
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1157 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1158 double prev_region_density_to_right = |
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1159 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1160 if (density_to_right <= prev_region_density_to_right) { |
0 | 1161 return dense_prefix; |
1162 } | |
1163 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1164 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1165 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1166 prev_region_density_to_right); |
0 | 1167 } |
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1168 dense_prefix -= region_size; |
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1169 live_to_right = prev_region_live_to_right; |
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1170 space_to_right = prev_region_space_to_right; |
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1171 density_to_right = prev_region_density_to_right; |
0 | 1172 } |
1173 return dense_prefix; | |
1174 } | |
1175 | |
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1176 dense_prefix += region_size; |
0 | 1177 ++cp; |
1178 } | |
1179 | |
1180 return dense_prefix; | |
1181 } | |
1182 | |
1183 #ifndef PRODUCT | |
1184 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1185 const SpaceId id, | |
1186 const bool maximum_compaction, | |
1187 HeapWord* const addr) | |
1188 { | |
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1189 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1190 RegionData* const cp = summary_data().region(region_idx); |
0 | 1191 const MutableSpace* const space = _space_info[id].space(); |
1192 HeapWord* const new_top = _space_info[id].new_top(); | |
1193 | |
1194 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1195 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1196 const size_t space_cap = space->capacity_in_words(); | |
1197 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1198 const size_t live_to_right = new_top - cp->destination(); | |
1199 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1200 | |
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1201 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1202 "spl=" SIZE_FORMAT " " |
1203 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1204 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1205 " ratio=%10.8f", | |
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1206 algorithm, addr, region_idx, |
0 | 1207 space_live, |
1208 dead_to_left, dead_to_left_pct, | |
1209 dead_to_right, live_to_right, | |
1210 double(dead_to_right) / live_to_right); | |
1211 } | |
1212 #endif // #ifndef PRODUCT | |
1213 | |
1214 // Return a fraction indicating how much of the generation can be treated as | |
1215 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1216 // based on the density of live objects in the generation to determine a limit, | |
1217 // which is then adjusted so the return value is min_percent when the density is | |
1218 // 1. | |
1219 // | |
1220 // The following table shows some return values for a different values of the | |
1221 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1222 // min_percent is 1. | |
1223 // | |
1224 // fraction allowed as dead wood | |
1225 // ----------------------------------------------------------------- | |
1226 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1227 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1228 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1229 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1230 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1231 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1232 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1233 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1234 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1235 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1236 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1237 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1238 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1239 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1240 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1241 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1242 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1243 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1244 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1245 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1246 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1247 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1248 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1249 | |
1250 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1251 { | |
1252 assert(_dwl_initialized, "uninitialized"); | |
1253 | |
1254 // The raw limit is the value of the normal distribution at x = density. | |
1255 const double raw_limit = normal_distribution(density); | |
1256 | |
1257 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1258 // | |
1259 // First subtract the adjustment value (which is simply the precomputed value | |
1260 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1261 // Then add the minimum value, so the minimum is returned when the density is | |
1262 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1263 const double min = double(min_percent) / 100.0; | |
1264 const double limit = raw_limit - _dwl_adjustment + min; | |
1265 return MAX2(limit, 0.0); | |
1266 } | |
1267 | |
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1268 ParallelCompactData::RegionData* |
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1269 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1270 const RegionData* end) |
0 | 1271 { |
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1272 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1273 ParallelCompactData& sd = summary_data(); |
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1274 size_t left = sd.region(beg); |
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1275 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1276 |
1277 // Binary search. | |
1278 while (left < right) { | |
1279 // Equivalent to (left + right) / 2, but does not overflow. | |
1280 const size_t middle = left + (right - left) / 2; | |
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1281 RegionData* const middle_ptr = sd.region(middle); |
0 | 1282 HeapWord* const dest = middle_ptr->destination(); |
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1283 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1284 assert(dest != NULL, "sanity"); |
1285 assert(dest <= addr, "must move left"); | |
1286 | |
1287 if (middle > left && dest < addr) { | |
1288 right = middle - 1; | |
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1289 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1290 left = middle + 1; |
1291 } else { | |
1292 return middle_ptr; | |
1293 } | |
1294 } | |
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1295 return sd.region(left); |
0 | 1296 } |
1297 | |
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1298 ParallelCompactData::RegionData* |
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1299 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1300 const RegionData* end, |
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1301 size_t dead_words) |
0 | 1302 { |
1303 ParallelCompactData& sd = summary_data(); | |
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1304 size_t left = sd.region(beg); |
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1305 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1306 |
1307 // Binary search. | |
1308 while (left < right) { | |
1309 // Equivalent to (left + right) / 2, but does not overflow. | |
1310 const size_t middle = left + (right - left) / 2; | |
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1311 RegionData* const middle_ptr = sd.region(middle); |
0 | 1312 HeapWord* const dest = middle_ptr->destination(); |
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1313 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1314 assert(dest != NULL, "sanity"); |
1315 assert(dest <= addr, "must move left"); | |
1316 | |
1317 const size_t dead_to_left = pointer_delta(addr, dest); | |
1318 if (middle > left && dead_to_left > dead_words) { | |
1319 right = middle - 1; | |
1320 } else if (middle < right && dead_to_left < dead_words) { | |
1321 left = middle + 1; | |
1322 } else { | |
1323 return middle_ptr; | |
1324 } | |
1325 } | |
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1326 return sd.region(left); |
0 | 1327 } |
1328 | |
1329 // The result is valid during the summary phase, after the initial summarization | |
1330 // of each space into itself, and before final summarization. | |
1331 inline double | |
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1332 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1333 HeapWord* const bottom, |
1334 HeapWord* const top, | |
1335 HeapWord* const new_top) | |
1336 { | |
1337 ParallelCompactData& sd = summary_data(); | |
1338 | |
1339 assert(cp != NULL, "sanity"); | |
1340 assert(bottom != NULL, "sanity"); | |
1341 assert(top != NULL, "sanity"); | |
1342 assert(new_top != NULL, "sanity"); | |
1343 assert(top >= new_top, "summary data problem?"); | |
1344 assert(new_top > bottom, "space is empty; should not be here"); | |
1345 assert(new_top >= cp->destination(), "sanity"); | |
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1346 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1347 |
1348 HeapWord* const destination = cp->destination(); | |
1349 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1350 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1351 const size_t compacted_region_used = pointer_delta(top, |
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1352 sd.region_to_addr(cp)); |
0 | 1353 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1354 | |
1355 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1356 return double(reclaimable) / divisor; | |
1357 } | |
1358 | |
1359 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1360 // compacted region. The address is always on a region boundary. |
0 | 1361 // |
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1362 // Completely full regions at the left are skipped, since no compaction can |
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1363 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1364 // computed, based on the density (amount live / capacity) of the generation; |
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1365 // the region with approximately that amount of dead space to the left is |
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1366 // identified as the limit region. Regions between the last completely full |
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1367 // region and the limit region are scanned and the one that has the best |
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1368 // (maximum) reclaimed_ratio() is selected. |
0 | 1369 HeapWord* |
1370 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1371 bool maximum_compaction) | |
1372 { | |
483
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1373 if (ParallelOldGCSplitALot) { |
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1374 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1375 // The value was chosen to provoke splitting a young gen space; use it. |
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1376 return _space_info[id].dense_prefix(); |
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1377 } |
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1378 } |
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1379 |
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1380 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1381 const ParallelCompactData& sd = summary_data(); |
1382 | |
1383 const MutableSpace* const space = _space_info[id].space(); | |
1384 HeapWord* const top = space->top(); | |
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1385 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1386 HeapWord* const new_top = _space_info[id].new_top(); |
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1387 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1388 HeapWord* const bottom = space->bottom(); |
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1389 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1390 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1391 const RegionData* const new_top_cp = |
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1392 sd.addr_to_region_ptr(new_top_aligned_up); |
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1393 |
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1394 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1395 // of the dense prefix. |
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1396 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1397 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1398 space->is_empty(), "no dead space allowed to the left"); |
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1399 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1400 "region must have dead space"); |
0 | 1401 |
1402 // The gc number is saved whenever a maximum compaction is done, and used to | |
1403 // determine when the maximum compaction interval has expired. This avoids | |
1404 // successive max compactions for different reasons. | |
1405 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1406 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1407 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1408 total_invocations() == HeapFirstMaximumCompactionCount; | |
1409 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1410 _maximum_compaction_gc_num = total_invocations(); | |
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1411 return sd.region_to_addr(full_cp); |
0 | 1412 } |
1413 | |
1414 const size_t space_live = pointer_delta(new_top, bottom); | |
1415 const size_t space_used = space->used_in_words(); | |
1416 const size_t space_capacity = space->capacity_in_words(); | |
1417 | |
1418 const double density = double(space_live) / double(space_capacity); | |
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1419 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1420 const double limiter = dead_wood_limiter(density, min_percent_free); |
1421 const size_t dead_wood_max = space_used - space_live; | |
1422 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1423 dead_wood_max); | |
1424 | |
1425 if (TraceParallelOldGCDensePrefix) { | |
1426 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1427 "space_cap=" SIZE_FORMAT, | |
1428 space_live, space_used, | |
1429 space_capacity); | |
1430 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1431 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1432 density, min_percent_free, limiter, | |
1433 dead_wood_max, dead_wood_limit); | |
1434 } | |
1435 | |
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1436 // Locate the region with the desired amount of dead space to the left. |
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1437 const RegionData* const limit_cp = |
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1438 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1439 |
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1440 // Scan from the first region with dead space to the limit region and find the |
0 | 1441 // one with the best (largest) reclaimed ratio. |
1442 double best_ratio = 0.0; | |
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1443 const RegionData* best_cp = full_cp; |
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1444 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1445 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1446 if (tmp_ratio > best_ratio) { | |
1447 best_cp = cp; | |
1448 best_ratio = tmp_ratio; | |
1449 } | |
1450 } | |
1451 | |
1452 #if 0 | |
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1453 // Something to consider: if the region with the best ratio is 'close to' the |
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1454 // first region w/free space, choose the first region with free space |
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1455 // ("first-free"). The first-free region is usually near the start of the |
0 | 1456 // heap, which means we are copying most of the heap already, so copy a bit |
1457 // more to get complete compaction. | |
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1458 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1459 _maximum_compaction_gc_num = total_invocations(); |
1460 best_cp = full_cp; | |
1461 } | |
1462 #endif // #if 0 | |
1463 | |
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1464 return sd.region_to_addr(best_cp); |
0 | 1465 } |
1466 | |
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1467 #ifndef PRODUCT |
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1468 void |
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1469 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1470 size_t words) |
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1471 { |
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1472 if (TraceParallelOldGCSummaryPhase) { |
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1473 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1474 SIZE_FORMAT, start, start + words, words); |
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1475 } |
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1476 |
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1477 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1478 CollectedHeap::fill_with_objects(start, words); |
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1479 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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|
1480 _mark_bitmap.mark_obj(p, words); |
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diff
changeset
|
1481 _summary_data.add_obj(p, words); |
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diff
changeset
|
1482 start_array->allocate_block(p); |
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diff
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|
1483 } |
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diff
changeset
|
1484 } |
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diff
changeset
|
1485 |
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diff
changeset
|
1486 void |
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changeset
|
1487 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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|
1488 { |
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changeset
|
1489 ParallelCompactData& sd = summary_data(); |
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|
1490 MutableSpace* space = _space_info[id].space(); |
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|
1491 |
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diff
changeset
|
1492 // Find the source and destination start addresses. |
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changeset
|
1493 HeapWord* const src_addr = sd.region_align_down(start); |
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|
1494 HeapWord* dst_addr; |
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1495 if (src_addr < start) { |
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|
1496 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1497 } else if (src_addr > space->bottom()) { |
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1498 // The start (the original top() value) is aligned to a region boundary so |
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changeset
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1499 // the associated region does not have a destination. Compute the |
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|
1500 // destination from the previous region. |
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|
1501 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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|
1502 dst_addr = cp->destination() + cp->data_size(); |
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1503 } else { |
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changeset
|
1504 // Filling the entire space. |
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changeset
|
1505 dst_addr = space->bottom(); |
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diff
changeset
|
1506 } |
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changeset
|
1507 assert(dst_addr != NULL, "sanity"); |
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|
1508 |
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diff
changeset
|
1509 // Update the summary data. |
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changeset
|
1510 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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changeset
|
1511 src_addr, space->top(), NULL, |
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diff
changeset
|
1512 dst_addr, space->end(), |
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changeset
|
1513 _space_info[id].new_top_addr()); |
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changeset
|
1514 assert(result, "should not fail: bad filler object size"); |
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|
1515 } |
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diff
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|
1516 |
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changeset
|
1517 void |
496
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1518 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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|
1519 { |
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diff
changeset
|
1520 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1521 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
|
1522 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1523 |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1524 MutableSpace* const space = _space_info[id].space(); |
b27c885f75f9
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495
diff
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|
1525 if (space->is_empty()) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1526 HeapWord* b = space->bottom(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1527 HeapWord* t = b + space->capacity_in_words() / 2; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1528 space->set_top(t); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
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diff
changeset
|
1529 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1530 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1531 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1532 |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1489
diff
changeset
|
1533 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
|
1534 size_t obj_len = min_size; |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1535 while (b + obj_len <= t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1536 CollectedHeap::fill_with_object(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1537 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
|
1538 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
|
1539 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
|
1540 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
|
1541 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1542 if (b < t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1543 // 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
|
1544 space->set_top(b); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1545 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1546 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1547 } |
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 HeapWord** nta = _space_info[id].new_top_addr(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1551 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
|
1552 space->bottom(), space->top(), NULL, |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1553 space->bottom(), space->end(), nta); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1554 assert(result, "space must fit into itself"); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1555 } |
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 void |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1559 PSParallelCompact::provoke_split(bool & max_compaction) |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1560 { |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1561 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1562 return; |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1563 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
jcoomes
parents:
495
diff
changeset
|
1564 |
483
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1565 const size_t region_size = ParallelCompactData::RegionSize; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1566 ParallelCompactData& sd = summary_data(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1567 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1568 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
|
1569 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
|
1570 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
|
1571 _space_info[eden_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1572 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
|
1573 _space_info[from_space_id].new_top()); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1574 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1575 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
|
1576 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
|
1577 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
|
1578 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
|
1579 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
|
1580 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1581 // 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
|
1582 SpaceId id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1583 MutableSpace* space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1584 size_t live_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1585 size_t fill_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1586 if (eden_live + eden_fillable >= region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1587 id = eden_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1588 space = eden_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1589 live_words = eden_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1590 fill_words = eden_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1591 } 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
|
1592 id = from_space_id; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1593 space = from_space; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1594 live_words = from_live; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1595 fill_words = from_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1596 } else { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1597 return; // Give up. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1598 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1599 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
|
1600 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1601 if (live_words < region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1602 // Fill from top() to end() w/live objects of mixed sizes. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1603 HeapWord* const fill_start = space->top(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1604 live_words += fill_words; |
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1605 |
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1606 space->set_top(fill_start + fill_words); |
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1607 if (ZapUnusedHeapArea) { |
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|
1608 space->set_top_for_allocations(); |
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|
1609 } |
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|
1610 |
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1611 HeapWord* cur_addr = fill_start; |
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1612 while (fill_words > 0) { |
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1613 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1614 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1615 if (fill_words - cur_size < min_fill_size) { |
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1616 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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1617 } |
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1618 |
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1619 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1620 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1621 sd.add_obj(cur_addr, cur_size); |
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|
1622 |
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1623 cur_addr += cur_size; |
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1624 fill_words -= cur_size; |
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|
1625 } |
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1626 |
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1627 summarize_new_objects(id, fill_start); |
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1628 } |
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|
1629 |
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1630 max_compaction = false; |
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1631 |
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1632 // Manipulate the old gen so that it has room for about half of the live data |
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1633 // in the target young gen space (live_words / 2). |
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1634 id = old_space_id; |
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1635 space = _space_info[id].space(); |
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1636 const size_t free_at_end = space->free_in_words(); |
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1637 const size_t free_target = align_object_size(live_words / 2); |
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1638 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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1639 |
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1640 if (free_at_end >= free_target + min_fill_size) { |
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1641 // Fill space above top() and set the dense prefix so everything survives. |
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1642 HeapWord* const fill_start = space->top(); |
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1643 const size_t fill_size = free_at_end - free_target; |
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1644 space->set_top(space->top() + fill_size); |
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1645 if (ZapUnusedHeapArea) { |
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1646 space->set_top_for_allocations(); |
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1647 } |
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1648 fill_with_live_objects(id, fill_start, fill_size); |
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1649 summarize_new_objects(id, fill_start); |
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1650 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1651 } else if (dead + free_at_end > free_target) { |
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1652 // Find a dense prefix that makes the right amount of space available. |
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1653 HeapWord* cur = sd.region_align_down(space->top()); |
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1654 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1655 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1656 while (dead_to_right < free_target) { |
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1657 cur -= region_size; |
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1658 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1659 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1660 } |
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1661 _space_info[id].set_dense_prefix(cur); |
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1662 } |
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1663 } |
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1664 #endif // #ifndef PRODUCT |
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1665 |
0 | 1666 void PSParallelCompact::summarize_spaces_quick() |
1667 { | |
1668 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1669 const MutableSpace* space = _space_info[i].space(); | |
482
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1670 HeapWord** nta = _space_info[i].new_top_addr(); |
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1671 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1672 space->bottom(), space->top(), NULL, |
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1673 space->bottom(), space->end(), nta); |
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1674 assert(result, "space must fit into itself"); |
0 | 1675 _space_info[i].set_dense_prefix(space->bottom()); |
1676 } | |
496
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1677 |
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1678 #ifndef PRODUCT |
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1679 if (ParallelOldGCSplitALot) { |
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1680 provoke_split_fill_survivor(to_space_id); |
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1681 } |
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1682 #endif // #ifndef PRODUCT |
0 | 1683 } |
1684 | |
1685 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1686 { | |
1687 HeapWord* const dense_prefix_end = dense_prefix(id); | |
375
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1688 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1689 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
375
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1690 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1691 // Only enough dead space is filled so that any remaining dead space to the |
1692 // left is larger than the minimum filler object. (The remainder is filled | |
1693 // during the copy/update phase.) | |
1694 // | |
1695 // The size of the dead space to the right of the boundary is not a | |
1696 // concern, since compaction will be able to use whatever space is | |
1697 // available. | |
1698 // | |
1699 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1700 // surrounds the space to be filled with an object. | |
1701 // | |
1702 // In the 32-bit VM, each bit represents two 32-bit words: | |
1703 // +---+ | |
1704 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1705 // end_bits: ... x x x | 0 | || 0 x x ... | |
1706 // +---+ | |
1707 // | |
1708 // In the 64-bit VM, each bit represents one 64-bit word: | |
1709 // +------------+ | |
1710 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1711 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1712 // +------------+ | |
1713 // +-------+ | |
1714 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1715 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1716 // +-------+ | |
1717 // +-----------+ | |
1718 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1719 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1720 // +-----------+ | |
1721 // +-------+ | |
1722 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1723 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1724 // +-------+ | |
1725 | |
1726 // Initially assume case a, c or e will apply. | |
1571
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1727 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1728 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1729 | |
1730 #ifdef _LP64 | |
1571
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|
1731 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1732 // Cases a, c or e. |
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1733 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1734 // Case b above. |
1735 obj_beg = dense_prefix_end - 1; | |
1736 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1737 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1738 // Case d above. | |
1739 obj_beg = dense_prefix_end - 3; | |
1740 obj_len = 3; | |
1741 } | |
1742 #endif // #ifdef _LP64 | |
1743 | |
482
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1744 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1745 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1746 _summary_data.add_obj(obj_beg, obj_len); | |
1747 assert(start_array(id) != NULL, "sanity"); | |
1748 start_array(id)->allocate_block(obj_beg); | |
1749 } | |
1750 } | |
1751 | |
1752 void | |
482
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1753 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1754 { |
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1755 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1756 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1757 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1758 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1759 cur->set_source_region(0); |
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|
1760 } |
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|
1761 } |
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|
1762 |
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1763 void |
0 | 1764 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1765 { | |
1766 assert(id < last_space_id, "id out of range"); | |
483
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1767 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1768 ParallelOldGCSplitALot && id == old_space_id, |
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1769 "should have been reset in summarize_spaces_quick()"); |
0 | 1770 |
1771 const MutableSpace* space = _space_info[id].space(); | |
265
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1772 if (_space_info[id].new_top() != space->bottom()) { |
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1773 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1774 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1775 |
1776 #ifndef PRODUCT | |
265
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1777 if (TraceParallelOldGCDensePrefix) { |
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|
1778 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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|
1779 dense_prefix_end); |
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1780 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1781 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1782 } |
0 | 1783 #endif // #ifndef PRODUCT |
1784 | |
483
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|
1785 // Recompute the summary data, taking into account the dense prefix. If |
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1786 // every last byte will be reclaimed, then the existing summary data which |
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|
1787 // compacts everything can be left in place. |
265
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1788 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1789 // If dead space crosses the dense prefix boundary, it is (at least |
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1790 // partially) filled with a dummy object, marked live and added to the |
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1791 // summary data. This simplifies the copy/update phase and must be done |
483
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1792 // before the final locations of objects are determined, to prevent |
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1793 // leaving a fragment of dead space that is too small to fill. |
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1794 fill_dense_prefix_end(id); |
482
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1795 |
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1796 // Compute the destination of each Region, and thus each object. |
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1797 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1798 _summary_data.summarize(_space_info[id].split_info(), |
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1799 dense_prefix_end, space->top(), NULL, |
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1800 dense_prefix_end, space->end(), |
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1801 _space_info[id].new_top_addr()); |
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1802 } |
0 | 1803 } |
1804 | |
1805 if (TraceParallelOldGCSummaryPhase) { | |
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1806 const size_t region_size = ParallelCompactData::RegionSize; |
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1807 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
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1808 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1809 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1810 HeapWord* const new_top = _space_info[id].new_top(); |
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1811 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1812 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1813 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
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1814 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1815 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1816 id, space->capacity_in_words(), dense_prefix_end, | |
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1817 dp_region, dp_words / region_size, |
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1818 cr_words / region_size, new_top); |
0 | 1819 } |
1820 } | |
1821 | |
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1822 #ifndef PRODUCT |
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1823 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1824 HeapWord* dst_beg, HeapWord* dst_end, |
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1825 SpaceId src_space_id, |
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1826 HeapWord* src_beg, HeapWord* src_end) |
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1827 { |
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1828 if (TraceParallelOldGCSummaryPhase) { |
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1829 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1830 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1831 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1832 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1833 SIZE_FORMAT "-" SIZE_FORMAT, |
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1834 src_space_id, space_names[src_space_id], |
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1835 dst_space_id, space_names[dst_space_id], |
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1836 src_beg, src_end, |
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1837 _summary_data.addr_to_region_idx(src_beg), |
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1838 _summary_data.addr_to_region_idx(src_end), |
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1839 dst_beg, dst_end, |
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1840 _summary_data.addr_to_region_idx(dst_beg), |
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1841 _summary_data.addr_to_region_idx(dst_end)); |
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1842 } |
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1843 } |
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1844 #endif // #ifndef PRODUCT |
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1845 |
0 | 1846 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1847 bool maximum_compaction) | |
1848 { | |
10405 | 1849 GCTraceTime tm("summary phase", print_phases(), true, &_gc_timer); |
0 | 1850 // trace("2"); |
1851 | |
1852 #ifdef ASSERT | |
1853 if (TraceParallelOldGCMarkingPhase) { | |
1854 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1855 "add_obj_bytes=" SIZE_FORMAT, | |
1856 add_obj_count, add_obj_size * HeapWordSize); | |
1857 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1858 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1859 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1860 } | |
1861 #endif // #ifdef ASSERT | |
1862 | |
1863 // Quick summarization of each space into itself, to see how much is live. | |
1864 summarize_spaces_quick(); | |
1865 | |
1866 if (TraceParallelOldGCSummaryPhase) { | |
1867 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1868 Universe::print(); | |
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1869 NOT_PRODUCT(print_region_ranges()); |
0 | 1870 if (Verbose) { |
1871 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1872 } | |
1873 } | |
1874 | |
1875 // The amount of live data that will end up in old space (assuming it fits). | |
1876 size_t old_space_total_live = 0; | |
482
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1877 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1878 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1879 _space_info[id].space()->bottom()); | |
1880 } | |
1881 | |
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1882 MutableSpace* const old_space = _space_info[old_space_id].space(); |
483
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1883 const size_t old_capacity = old_space->capacity_in_words(); |
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1884 if (old_space_total_live > old_capacity) { |
0 | 1885 // XXX - should also try to expand |
1886 maximum_compaction = true; | |
1887 } | |
483
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1888 #ifndef PRODUCT |
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1889 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
496
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1890 provoke_split(maximum_compaction); |
483
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1891 } |
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1892 #endif // #ifndef PRODUCT |
0 | 1893 |
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1894 // Old generations. |
0 | 1895 summarize_space(old_space_id, maximum_compaction); |
1896 | |
482
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1897 // Summarize the remaining spaces in the young gen. The initial target space |
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1898 // is the old gen. If a space does not fit entirely into the target, then the |
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1899 // remainder is compacted into the space itself and that space becomes the new |
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1900 // target. |
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1901 SpaceId dst_space_id = old_space_id; |
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1902 HeapWord* dst_space_end = old_space->end(); |
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1903 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1904 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1905 const MutableSpace* space = _space_info[id].space(); |
1906 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1907 space->bottom()); | |
482
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1908 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1909 |
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1910 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1911 SpaceId(id), space->bottom(), space->top());) |
266
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1912 if (live > 0 && live <= available) { |
0 | 1913 // All the live data will fit. |
482
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1914 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1915 space->bottom(), space->top(), |
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1916 NULL, |
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1917 *new_top_addr, dst_space_end, |
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1918 new_top_addr); |
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1919 assert(done, "space must fit into old gen"); |
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1920 |
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1921 // Reset the new_top value for the space. |
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1922 _space_info[id].set_new_top(space->bottom()); |
482
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1923 } else if (live > 0) { |
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1924 // Attempt to fit part of the source space into the target space. |
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1925 HeapWord* next_src_addr = NULL; |
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1926 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1927 space->bottom(), space->top(), |
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1928 &next_src_addr, |
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1929 *new_top_addr, dst_space_end, |
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1930 new_top_addr); |
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1931 assert(!done, "space should not fit into old gen"); |
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1932 assert(next_src_addr != NULL, "sanity"); |
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1933 |
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1934 // The source space becomes the new target, so the remainder is compacted |
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1935 // within the space itself. |
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1936 dst_space_id = SpaceId(id); |
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1937 dst_space_end = space->end(); |
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1938 new_top_addr = _space_info[id].new_top_addr(); |
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1939 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1940 space->bottom(), dst_space_end, |
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1941 SpaceId(id), next_src_addr, space->top());) |
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1942 done = _summary_data.summarize(_space_info[id].split_info(), |
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1943 next_src_addr, space->top(), |
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1944 NULL, |
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1945 space->bottom(), dst_space_end, |
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1946 new_top_addr); |
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1947 assert(done, "space must fit when compacted into itself"); |
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1948 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1949 } |
1950 } | |
1951 | |
1952 if (TraceParallelOldGCSummaryPhase) { | |
1953 tty->print_cr("summary_phase: after final summarization"); | |
1954 Universe::print(); | |
375
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1955 NOT_PRODUCT(print_region_ranges()); |
0 | 1956 if (Verbose) { |
1957 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1958 } | |
1959 } | |
1960 } | |
1961 | |
1962 // This method should contain all heap-specific policy for invoking a full | |
1963 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1964 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1965 // before full gc, or any other specialized behavior, it needs to be added here. | |
1966 // | |
1967 // Note that this method should only be called from the vm_thread while at a | |
1968 // safepoint. | |
1387
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1969 // |
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1970 // Note that the all_soft_refs_clear flag in the collector policy |
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1971 // may be true because this method can be called without intervening |
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1972 // activity. For example when the heap space is tight and full measure |
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1973 // are being taken to free space. |
0 | 1974 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1975 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1976 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1977 "should be in vm thread"); | |
1387
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1978 |
0 | 1979 ParallelScavengeHeap* heap = gc_heap(); |
1980 GCCause::Cause gc_cause = heap->gc_cause(); | |
1981 assert(!heap->is_gc_active(), "not reentrant"); | |
1982 | |
1983 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
1387
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1984 IsGCActiveMark mark; |
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1985 |
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1986 if (ScavengeBeforeFullGC) { |
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1987 PSScavenge::invoke_no_policy(); |
0 | 1988 } |
1387
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1989 |
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1990 const bool clear_all_soft_refs = |
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1991 heap->collector_policy()->should_clear_all_soft_refs(); |
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1992 |
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1993 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1994 maximum_heap_compaction); |
0 | 1995 } |
1996 | |
1997 // This method contains no policy. You should probably | |
1998 // be calling invoke() instead. | |
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1999 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 2000 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
2001 assert(ref_processor() != NULL, "Sanity"); | |
2002 | |
139
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2003 if (GC_locker::check_active_before_gc()) { |
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2004 return false; |
0 | 2005 } |
2006 | |
10405 | 2007 ParallelScavengeHeap* heap = gc_heap(); |
2008 | |
13400
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2009 _gc_timer.register_gc_start(); |
10405 | 2010 _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start()); |
2011 | |
0 | 2012 TimeStamp marking_start; |
2013 TimeStamp compaction_start; | |
2014 TimeStamp collection_exit; | |
2015 | |
2016 GCCause::Cause gc_cause = heap->gc_cause(); | |
2017 PSYoungGen* young_gen = heap->young_gen(); | |
2018 PSOldGen* old_gen = heap->old_gen(); | |
2019 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
2020 | |
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2021 // The scope of casr should end after code that can change |
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2022 // CollectorPolicy::_should_clear_all_soft_refs. |
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2023 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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2024 heap->collector_policy()); |
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2025 |
263
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2026 if (ZapUnusedHeapArea) { |
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2027 // Save information needed to minimize mangling |
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2028 heap->record_gen_tops_before_GC(); |
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2029 } |
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2030 |
10405 | 2031 heap->pre_full_gc_dump(&_gc_timer); |
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2032 |
0 | 2033 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2034 | |
2035 // Make sure data structures are sane, make the heap parsable, and do other | |
2036 // miscellaneous bookkeeping. | |
2037 PreGCValues pre_gc_values; | |
2038 pre_compact(&pre_gc_values); | |
2039 | |
210 | 2040 // Get the compaction manager reserved for the VM thread. |
2041 ParCompactionManager* const vmthread_cm = | |
2042 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2043 | |
0 | 2044 // Place after pre_compact() where the number of invocations is incremented. |
2045 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2046 | |
2047 { | |
2048 ResourceMark rm; | |
2049 HandleMark hm; | |
2050 | |
4095
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2051 // Set the number of GC threads to be used in this collection |
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2052 gc_task_manager()->set_active_gang(); |
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2053 gc_task_manager()->task_idle_workers(); |
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2054 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2055 |
0 | 2056 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2057 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
10405 | 2058 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
0 | 2059 TraceCollectorStats tcs(counters()); |
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2060 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2061 |
2062 if (TraceGen1Time) accumulated_time()->start(); | |
2063 | |
2064 // Let the size policy know we're starting | |
2065 size_policy->major_collection_begin(); | |
2066 | |
2067 CodeCache::gc_prologue(); | |
2068 Threads::gc_prologue(); | |
2069 | |
2070 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2071 | |
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2072 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
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2073 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2074 |
2075 bool marked_for_unloading = false; | |
2076 | |
2077 marking_start.update(); | |
10405 | 2078 marking_phase(vmthread_cm, maximum_heap_compaction, &_gc_tracer); |
0 | 2079 |
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2080 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2081 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2082 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2083 |
2084 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2085 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2086 | |
2087 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2088 // needed by the compaction for filling holes in the dense prefix. | |
2089 adjust_roots(); | |
2090 | |
2091 compaction_start.update(); | |
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2092 compact(); |
0 | 2093 |
2094 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2095 // done before resizing. | |
2096 post_compact(); | |
2097 | |
2098 // Let the size policy know we're done | |
2099 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2100 | |
2101 if (UseAdaptiveSizePolicy) { | |
2102 if (PrintAdaptiveSizePolicy) { | |
2103 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2104 gclog_or_tty->stamp(); | |
2105 gclog_or_tty->print_cr(" collection: %d ", | |
2106 heap->total_collections()); | |
2107 if (Verbose) { | |
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2108 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2109 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2110 } |
2111 } | |
2112 | |
2113 // Don't check if the size_policy is ready here. Let | |
2114 // the size_policy check that internally. | |
2115 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2116 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2117 UseAdaptiveSizePolicyWithSystemGC)) { | |
2118 // Calculate optimal free space amounts | |
2119 assert(young_gen->max_size() > | |
2120 young_gen->from_space()->capacity_in_bytes() + | |
2121 young_gen->to_space()->capacity_in_bytes(), | |
2122 "Sizes of space in young gen are out-of-bounds"); | |
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2123 |
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2124 size_t young_live = young_gen->used_in_bytes(); |
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2125 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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2126 size_t old_live = old_gen->used_in_bytes(); |
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2127 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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2128 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 2129 size_t max_eden_size = young_gen->max_size() - |
2130 young_gen->from_space()->capacity_in_bytes() - | |
2131 young_gen->to_space()->capacity_in_bytes(); | |
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2132 |
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2133 // Used for diagnostics |
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2134 size_policy->clear_generation_free_space_flags(); |
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2135 |
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2136 size_policy->compute_generations_free_space(young_live, |
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2137 eden_live, |
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2138 old_live, |
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2139 cur_eden, |
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2140 max_old_gen_size, |
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2141 max_eden_size, |
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2142 true /* full gc*/); |
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2143 |
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2144 size_policy->check_gc_overhead_limit(young_live, |
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2145 eden_live, |
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2146 max_old_gen_size, |
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2147 max_eden_size, |
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2148 true /* full gc*/, |
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2149 gc_cause, |
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2150 heap->collector_policy()); |
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2151 |
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2152 size_policy->decay_supplemental_growth(true /* full gc*/); |
263
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2153 |
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2154 heap->resize_old_gen( |
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2155 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2156 |
2157 // Don't resize the young generation at an major collection. A | |
2158 // desired young generation size may have been calculated but | |
2159 // resizing the young generation complicates the code because the | |
2160 // resizing of the old generation may have moved the boundary | |
2161 // between the young generation and the old generation. Let the | |
2162 // young generation resizing happen at the minor collections. | |
2163 } | |
2164 if (PrintAdaptiveSizePolicy) { | |
2165 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2166 heap->total_collections()); | |
2167 } | |
2168 } | |
2169 | |
2170 if (UsePerfData) { | |
2171 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2172 counters->update_counters(); | |
2173 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2174 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2175 } | |
2176 | |
2177 heap->resize_all_tlabs(); | |
2178 | |
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2179 // Resize the metaspace capactiy after a collection |
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2180 MetaspaceGC::compute_new_size(); |
0 | 2181 |
2182 if (TraceGen1Time) accumulated_time()->stop(); | |
2183 | |
2184 if (PrintGC) { | |
2185 if (PrintGCDetails) { | |
2186 // No GC timestamp here. This is after GC so it would be confusing. | |
2187 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2188 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2189 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2190 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2191 } else { |
2192 heap->print_heap_change(pre_gc_values.heap_used()); | |
2193 } | |
2194 } | |
2195 | |
2196 // Track memory usage and detect low memory | |
2197 MemoryService::track_memory_usage(); | |
2198 heap->update_counters(); | |
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2199 gc_task_manager()->release_idle_workers(); |
0 | 2200 } |
2201 | |
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2202 #ifdef ASSERT |
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2203 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2204 ParCompactionManager* const cm = |
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2205 ParCompactionManager::manager_array(int(i)); |
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2206 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2207 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
1836
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2208 } |
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2209 #endif // ASSERT |
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2210 |
0 | 2211 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2212 HandleMark hm; // Discard invalid handles created during verification | |
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2213 Universe::verify(" VerifyAfterGC:"); |
0 | 2214 } |
2215 | |
2216 // Re-verify object start arrays | |
2217 if (VerifyObjectStartArray && | |
2218 VerifyAfterGC) { | |
2219 old_gen->verify_object_start_array(); | |
2220 } | |
2221 | |
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2222 if (ZapUnusedHeapArea) { |
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2223 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2224 } |
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2225 |
0 | 2226 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2227 | |
2228 collection_exit.update(); | |
2229 | |
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2230 heap->print_heap_after_gc(); |
10405 | 2231 heap->trace_heap_after_gc(&_gc_tracer); |
2232 | |
0 | 2233 if (PrintGCTaskTimeStamps) { |
2234 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2235 INT64_FORMAT, | |
2236 marking_start.ticks(), compaction_start.ticks(), | |
2237 collection_exit.ticks()); | |
2238 gc_task_manager()->print_task_time_stamps(); | |
2239 } | |
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2240 |
10405 | 2241 heap->post_full_gc_dump(&_gc_timer); |
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2242 |
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2243 #ifdef TRACESPINNING |
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2244 ParallelTaskTerminator::print_termination_counts(); |
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2245 #endif |
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2246 |
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2247 _gc_timer.register_gc_end(); |
10405 | 2248 |
2249 _gc_tracer.report_dense_prefix(dense_prefix(old_space_id)); | |
2250 _gc_tracer.report_gc_end(_gc_timer.gc_end(), _gc_timer.time_partitions()); | |
2251 | |
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2252 return true; |
0 | 2253 } |
2254 | |
2255 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2256 PSYoungGen* young_gen, | |
2257 PSOldGen* old_gen) { | |
2258 MutableSpace* const eden_space = young_gen->eden_space(); | |
2259 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2260 assert(young_gen->virtual_space()->alignment() == | |
2261 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2262 | |
2263 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2264 return false; | |
2265 } | |
2266 | |
2267 // Both generations must be completely committed. | |
2268 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2269 return false; | |
2270 } | |
2271 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2272 return false; | |
2273 } | |
2274 | |
2275 // Figure out how much to take from eden. Include the average amount promoted | |
2276 // in the total; otherwise the next young gen GC will simply bail out to a | |
2277 // full GC. | |
2278 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2279 const size_t eden_used = eden_space->used_in_bytes(); | |
2280 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2281 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2282 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2283 | |
2284 if (absorb_size >= eden_capacity) { | |
2285 return false; // Must leave some space in eden. | |
2286 } | |
2287 | |
2288 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2289 if (new_young_size < young_gen->min_gen_size()) { | |
2290 return false; // Respect young gen minimum size. | |
2291 } | |
2292 | |
2293 if (TraceAdaptiveGCBoundary && Verbose) { | |
2294 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2295 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2296 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2297 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2298 absorb_size / K, | |
2299 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2300 young_gen->from_space()->used_in_bytes() / K, | |
2301 young_gen->to_space()->used_in_bytes() / K, | |
2302 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2303 } | |
2304 | |
2305 // Fill the unused part of the old gen. | |
2306 MutableSpace* const old_space = old_gen->object_space(); | |
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2307 HeapWord* const unused_start = old_space->top(); |
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2308 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2309 |
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2310 if (unused_words > 0) { |
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2311 if (unused_words < CollectedHeap::min_fill_size()) { |
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2312 return false; // If the old gen cannot be filled, must give up. |
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2313 } |
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2314 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2315 } |
2316 | |
2317 // Take the live data from eden and set both top and end in the old gen to | |
2318 // eden top. (Need to set end because reset_after_change() mangles the region | |
2319 // from end to virtual_space->high() in debug builds). | |
2320 HeapWord* const new_top = eden_space->top(); | |
2321 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2322 absorb_size); | |
2323 young_gen->reset_after_change(); | |
2324 old_space->set_top(new_top); | |
2325 old_space->set_end(new_top); | |
2326 old_gen->reset_after_change(); | |
2327 | |
2328 // Update the object start array for the filler object and the data from eden. | |
2329 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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2330 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2331 start_array->allocate_block(p); |
0 | 2332 } |
2333 | |
2334 // Could update the promoted average here, but it is not typically updated at | |
2335 // full GCs and the value to use is unclear. Something like | |
2336 // | |
2337 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2338 | |
2339 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2340 return true; | |
2341 } | |
2342 | |
2343 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2344 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2345 "shouldn't return NULL"); | |
2346 return ParallelScavengeHeap::gc_task_manager(); | |
2347 } | |
2348 | |
2349 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
10405 | 2350 bool maximum_heap_compaction, |
2351 ParallelOldTracer *gc_tracer) { | |
0 | 2352 // Recursively traverse all live objects and mark them |
10405 | 2353 GCTraceTime tm("marking phase", print_phases(), true, &_gc_timer); |
0 | 2354 |
2355 ParallelScavengeHeap* heap = gc_heap(); | |
2356 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2357 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2358 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2359 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2360 |
2361 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2362 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2363 | |
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2364 // Need new claim bits before marking starts. |
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2365 ClassLoaderDataGraph::clear_claimed_marks(); |
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2366 |
0 | 2367 { |
10405 | 2368 GCTraceTime tm_m("par mark", print_phases(), true, &_gc_timer); |
2369 | |
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2370 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2371 |
2372 GCTaskQueue* q = GCTaskQueue::create(); | |
2373 | |
2374 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2375 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2376 // We scan the thread roots in parallel | |
2377 Threads::create_thread_roots_marking_tasks(q); | |
2378 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2379 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2380 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2381 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
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2382 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::class_loader_data)); |
0 | 2383 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); |
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2384 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2385 |
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2386 if (active_gc_threads > 1) { |
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2387 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2388 q->enqueue(new StealMarkingTask(&terminator)); |
2389 } | |
2390 } | |
2391 | |
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2392 gc_task_manager()->execute_and_wait(q); |
0 | 2393 } |
2394 | |
2395 // Process reference objects found during marking | |
2396 { | |
10405 | 2397 GCTraceTime tm_r("reference processing", print_phases(), true, &_gc_timer); |
2398 | |
2399 ReferenceProcessorStats stats; | |
0 | 2400 if (ref_processor()->processing_is_mt()) { |
2401 RefProcTaskExecutor task_executor; | |
10405 | 2402 stats = ref_processor()->process_discovered_references( |
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2403 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
10405 | 2404 &task_executor, &_gc_timer); |
0 | 2405 } else { |
10405 | 2406 stats = ref_processor()->process_discovered_references( |
2407 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL, | |
2408 &_gc_timer); | |
0 | 2409 } |
10405 | 2410 |
2411 gc_tracer->report_gc_reference_stats(stats); | |
0 | 2412 } |
2413 | |
10405 | 2414 GCTraceTime tm_c("class unloading", print_phases(), true, &_gc_timer); |
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2415 |
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2416 // This is the point where the entire marking should have completed. |
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2417 assert(cm->marking_stacks_empty(), "Marking should have completed"); |
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2418 |
0 | 2419 // Follow system dictionary roots and unload classes. |
2420 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2421 | |
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2422 // Unload nmethods. |
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2423 CodeCache::do_unloading(is_alive_closure(), purged_class); |
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2424 |
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2425 // Prune dead klasses from subklass/sibling/implementor lists. |
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2426 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2427 |
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2428 // Delete entries for dead interned strings. |
0 | 2429 StringTable::unlink(is_alive_closure()); |
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2430 |
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2431 // Clean up unreferenced symbols in symbol table. |
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2432 SymbolTable::unlink(); |
10405 | 2433 _gc_tracer.report_object_count_after_gc(is_alive_closure()); |
0 | 2434 } |
2435 | |
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2436 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2437 ClassLoaderData* cld) { |
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2438 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2439 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2440 |
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2441 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2442 } |
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2443 |
0 | 2444 // This should be moved to the shared markSweep code! |
2445 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2446 public: | |
2447 bool do_object_b(oop p) { return true; } | |
2448 }; | |
2449 static PSAlwaysTrueClosure always_true; | |
2450 | |
2451 void PSParallelCompact::adjust_roots() { | |
2452 // Adjust the pointers to reflect the new locations | |
10405 | 2453 GCTraceTime tm("adjust roots", print_phases(), true, &_gc_timer); |
0 | 2454 |
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2455 // Need new claim bits when tracing through and adjusting pointers. |
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2456 ClassLoaderDataGraph::clear_claimed_marks(); |
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2457 |
0 | 2458 // General strong roots. |
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2459 Universe::oops_do(adjust_pointer_closure()); |
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2460 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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2461 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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2462 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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2463 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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2464 FlatProfiler::oops_do(adjust_pointer_closure()); |
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2465 Management::oops_do(adjust_pointer_closure()); |
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2466 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 2467 // SO_AllClasses |
10179
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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 |
2476 CodeCache::oops_do(adjust_pointer_closure()); | |
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2477 StringTable::oops_do(adjust_pointer_closure()); |
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2478 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2479 // Roots were visited so references into the young gen in roots |
2480 // may have been scanned. Process them also. | |
2481 // Should the reference processor have a span that excludes | |
2482 // young gen objects? | |
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2483 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 2484 } |
2485 | |
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2486 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2487 uint parallel_gc_threads) |
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2488 { |
10405 | 2489 GCTraceTime tm("drain task setup", print_phases(), true, &_gc_timer); |
0 | 2490 |
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2491 // Find the threads that are active |
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2492 unsigned int which = 0; |
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2493 |
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2494 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2495 for (uint j = 0; j < task_count; j++) { |
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2496 q->enqueue(new DrainStacksCompactionTask(j)); |
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2497 ParCompactionManager::verify_region_list_empty(j); |
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2498 // Set the region stacks variables to "no" region stack values |
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2499 // so that they will be recognized and needing a region stack |
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2500 // in the stealing tasks if they do not get one by executing |
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2501 // a draining stack. |
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2502 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2503 cm->set_region_stack(NULL); |
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2504 cm->set_region_stack_index((uint)max_uintx); |
0 | 2505 } |
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2506 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2507 |
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2508 // Find all regions that are available (can be filled immediately) and |
0 | 2509 // distribute them to the thread stacks. The iteration is done in reverse |
375
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2510 // order (high to low) so the regions will be removed in ascending order. |
0 | 2511 |
2512 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2513 | |
375
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2514 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2515 // A region index which corresponds to the tasks created above. |
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2516 // "which" must be 0 <= which < task_count |
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2517 |
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2518 which = 0; |
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2519 // id + 1 is used to test termination so unsigned can |
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2520 // be used with an old_space_id == 0. |
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2521 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2522 SpaceInfo* const space_info = _space_info + id; |
2523 MutableSpace* const space = space_info->space(); | |
2524 HeapWord* const new_top = space_info->new_top(); | |
2525 | |
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2526 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2527 const size_t end_region = |
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2528 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
6725
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2529 |
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2530 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
375
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2531 if (sd.region(cur)->claim_unsafe()) { |
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2532 ParCompactionManager::region_list_push(which, cur); |
0 | 2533 |
2534 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
375
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2535 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2536 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
264
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2537 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2538 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2539 } | |
2540 | |
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2541 NOT_PRODUCT(++fillable_regions;) |
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2542 |
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2543 // Assign regions to tasks in round-robin fashion. |
0 | 2544 if (++which == task_count) { |
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2545 assert(which <= parallel_gc_threads, |
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2546 "Inconsistent number of workers"); |
0 | 2547 which = 0; |
2548 } | |
2549 } | |
2550 } | |
2551 } | |
2552 | |
2553 if (TraceParallelOldGCCompactionPhase) { | |
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2554 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2555 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2556 } |
2557 } | |
2558 | |
2559 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2560 | |
2561 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2562 uint parallel_gc_threads) { | |
10405 | 2563 GCTraceTime tm("dense prefix task setup", print_phases(), true, &_gc_timer); |
0 | 2564 |
2565 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2566 | |
2567 // Iterate over all the spaces adding tasks for updating | |
375
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2568 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2569 // will work on opening the gaps and the remaining gc threads |
2570 // will work on the dense prefix. | |
482
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2571 unsigned int space_id; |
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2572 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2573 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2574 const MutableSpace* const space = _space_info[space_id].space(); | |
2575 | |
2576 if (dense_prefix_end == space->bottom()) { | |
2577 // There is no dense prefix for this space. | |
2578 continue; | |
2579 } | |
2580 | |
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2581 // The dense prefix is before this region. |
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2582 size_t region_index_end_dense_prefix = |
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2583 sd.addr_to_region_idx(dense_prefix_end); |
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2584 RegionData* const dense_prefix_cp = |
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2585 sd.region(region_index_end_dense_prefix); |
0 | 2586 assert(dense_prefix_end == space->end() || |
2587 dense_prefix_cp->available() || | |
2588 dense_prefix_cp->claimed(), | |
375
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2589 "The region after the dense prefix should always be ready to fill"); |
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2590 |
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2591 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2592 |
2593 // Is there dense prefix work? | |
375
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2594 size_t total_dense_prefix_regions = |
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2595 region_index_end_dense_prefix - region_index_start; |
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2596 // How many regions of the dense prefix should be given to |
0 | 2597 // each thread? |
375
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2598 if (total_dense_prefix_regions > 0) { |
0 | 2599 uint tasks_for_dense_prefix = 1; |
3251
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2600 if (total_dense_prefix_regions <= |
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2601 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2602 // Don't over partition. This assumes that |
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2603 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2604 // so there are not many regions to process. |
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2605 tasks_for_dense_prefix = parallel_gc_threads; |
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2606 } else { |
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2607 // Over partition |
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2608 tasks_for_dense_prefix = parallel_gc_threads * |
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2609 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2610 } |
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2611 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2612 tasks_for_dense_prefix; |
375
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2613 // Give each thread at least 1 region. |
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2614 if (regions_per_thread == 0) { |
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2615 regions_per_thread = 1; |
0 | 2616 } |
2617 | |
2618 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2619 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2620 break; |
2621 } | |
375
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2622 // region_index_end is not processed |
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2623 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2624 region_index_end_dense_prefix); |
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2625 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2626 region_index_start, |
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2627 region_index_end)); |
375
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2628 region_index_start = region_index_end; |
0 | 2629 } |
2630 } | |
2631 // This gets any part of the dense prefix that did not | |
2632 // fit evenly. | |
375
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2633 if (region_index_start < region_index_end_dense_prefix) { |
482
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2634 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2635 region_index_start, |
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2636 region_index_end_dense_prefix)); |
0 | 2637 } |
482
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2638 } |
0 | 2639 } |
2640 | |
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2641 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2642 GCTaskQueue* q, |
2643 ParallelTaskTerminator* terminator_ptr, | |
2644 uint parallel_gc_threads) { | |
10405 | 2645 GCTraceTime tm("steal task setup", print_phases(), true, &_gc_timer); |
0 | 2646 |
375
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2647 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2648 // other threads. |
2649 if (parallel_gc_threads > 1) { | |
2650 for (uint j = 0; j < parallel_gc_threads; j++) { | |
375
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2651 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2652 } |
2653 } | |
2654 } | |
2655 | |
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2656 #ifdef ASSERT |
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2657 // Write a histogram of the number of times the block table was filled for a |
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2658 // region. |
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2659 void PSParallelCompact::write_block_fill_histogram(outputStream* const out) |
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2660 { |
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2661 if (!TraceParallelOldGCCompactionPhase) return; |
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2662 |
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2663 typedef ParallelCompactData::RegionData rd_t; |
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2664 ParallelCompactData& sd = summary_data(); |
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2665 |
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2666 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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2667 MutableSpace* const spc = _space_info[id].space(); |
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2668 if (spc->bottom() != spc->top()) { |
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2669 const rd_t* const beg = sd.addr_to_region_ptr(spc->bottom()); |
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2670 HeapWord* const top_aligned_up = sd.region_align_up(spc->top()); |
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2671 const rd_t* const end = sd.addr_to_region_ptr(top_aligned_up); |
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2672 |
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2673 size_t histo[5] = { 0, 0, 0, 0, 0 }; |
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2674 const size_t histo_len = sizeof(histo) / sizeof(size_t); |
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2675 const size_t region_cnt = pointer_delta(end, beg, sizeof(rd_t)); |
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2676 |
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2677 for (const rd_t* cur = beg; cur < end; ++cur) { |
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2678 ++histo[MIN2(cur->blocks_filled_count(), histo_len - 1)]; |
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2679 } |
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2680 out->print("%u %-4s" SIZE_FORMAT_W(5), id, space_names[id], region_cnt); |
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2681 for (size_t i = 0; i < histo_len; ++i) { |
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2682 out->print(" " SIZE_FORMAT_W(5) " %5.1f%%", |
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2683 histo[i], 100.0 * histo[i] / region_cnt); |
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2684 } |
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2685 out->cr(); |
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2686 } |
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2687 } |
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2688 } |
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2689 #endif // #ifdef ASSERT |
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2690 |
0 | 2691 void PSParallelCompact::compact() { |
2692 // trace("5"); | |
10405 | 2693 GCTraceTime tm("compaction phase", print_phases(), true, &_gc_timer); |
0 | 2694 |
2695 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2696 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2697 PSOldGen* old_gen = heap->old_gen(); | |
2698 old_gen->start_array()->reset(); | |
2699 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
4095
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2700 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2701 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2702 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2703 |
2704 GCTaskQueue* q = GCTaskQueue::create(); | |
4095
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2705 enqueue_region_draining_tasks(q, active_gc_threads); |
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2706 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2707 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2708 |
2709 { | |
10405 | 2710 GCTraceTime tm_pc("par compact", print_phases(), true, &_gc_timer); |
0 | 2711 |
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2712 gc_task_manager()->execute_and_wait(q); |
0 | 2713 |
2714 #ifdef ASSERT | |
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2715 // Verify that all regions have been processed before the deferred updates. |
0 | 2716 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2717 verify_complete(SpaceId(id)); | |
2718 } | |
2719 #endif | |
2720 } | |
2721 | |
2722 { | |
2723 // Update the deferred objects, if any. Any compaction manager can be used. | |
10405 | 2724 GCTraceTime tm_du("deferred updates", print_phases(), true, &_gc_timer); |
0 | 2725 ParCompactionManager* cm = ParCompactionManager::manager_array(0); |
2726 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2727 update_deferred_objects(cm, SpaceId(id)); | |
2728 } | |
2729 } | |
10369
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2730 |
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2731 DEBUG_ONLY(write_block_fill_histogram(gclog_or_tty)); |
0 | 2732 } |
2733 | |
2734 #ifdef ASSERT | |
2735 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2736 // All Regions between space bottom() to new_top() should be marked as filled |
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2737 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2738 // should have been emptied). |
2739 ParallelCompactData& sd = summary_data(); | |
2740 SpaceInfo si = _space_info[space_id]; | |
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2741 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2742 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2743 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2744 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2745 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2746 |
2747 bool issued_a_warning = false; | |
2748 | |
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2749 size_t cur_region; |
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2750 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2751 const RegionData* const c = sd.region(cur_region); |
0 | 2752 if (!c->completed()) { |
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2753 warning("region " SIZE_FORMAT " not filled: " |
0 | 2754 "destination_count=" SIZE_FORMAT, |
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2755 cur_region, c->destination_count()); |
0 | 2756 issued_a_warning = true; |
2757 } | |
2758 } | |
2759 | |
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2760 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2761 const RegionData* const c = sd.region(cur_region); |
0 | 2762 if (!c->available()) { |
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2763 warning("region " SIZE_FORMAT " not empty: " |
0 | 2764 "destination_count=" SIZE_FORMAT, |
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2765 cur_region, c->destination_count()); |
0 | 2766 issued_a_warning = true; |
2767 } | |
2768 } | |
2769 | |
2770 if (issued_a_warning) { | |
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2771 print_region_ranges(); |
0 | 2772 } |
2773 } | |
2774 #endif // #ifdef ASSERT | |
2775 | |
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2776 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2777 void |
2778 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2779 SpaceId space_id, | |
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2780 size_t beg_region, |
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2781 size_t end_region) { |
0 | 2782 ParallelCompactData& sd = summary_data(); |
2783 ParMarkBitMap* const mbm = mark_bitmap(); | |
2784 | |
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2785 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2786 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2787 assert(beg_region <= end_region, "bad region range"); |
0 | 2788 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2789 | |
2790 #ifdef ASSERT | |
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2791 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2792 // filled. |
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2793 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2794 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2795 } |
2796 #endif // #ifdef ASSERT | |
2797 | |
2798 if (beg_addr != space(space_id)->bottom()) { | |
2799 // Find the first live object or block of dead space that *starts* in this | |
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2800 // range of regions. If a partial object crosses onto the region, skip it; |
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2801 // it will be marked for 'deferred update' when the object head is |
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2802 // processed. If dead space crosses onto the region, it is also skipped; it |
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2803 // will be filled when the prior region is processed. If neither of those |
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2804 // apply, the first word in the region is the start of a live object or dead |
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2805 // space. |
0 | 2806 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2807 const RegionData* const cp = sd.region(beg_region); |
0 | 2808 if (cp->partial_obj_size() != 0) { |
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2809 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2810 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2811 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2812 } | |
2813 } | |
2814 | |
2815 if (beg_addr < end_addr) { | |
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2816 // A live object or block of dead space starts in this range of Regions. |
0 | 2817 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2818 | |
2819 // Create closures and iterate. | |
2820 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2821 FillClosure fill_closure(cm, space_id); | |
2822 ParMarkBitMap::IterationStatus status; | |
2823 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2824 dense_prefix_end); | |
2825 if (status == ParMarkBitMap::incomplete) { | |
2826 update_closure.do_addr(update_closure.source()); | |
2827 } | |
2828 } | |
2829 | |
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2830 // Mark the regions as filled. |
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2831 RegionData* const beg_cp = sd.region(beg_region); |
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2832 RegionData* const end_cp = sd.region(end_region); |
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2833 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2834 cp->set_completed(); |
2835 } | |
2836 } | |
2837 | |
2838 // Return the SpaceId for the space containing addr. If addr is not in the | |
2839 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2840 // in the heap and asserts such. | |
2841 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2842 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2843 | |
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2844 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2845 if (_space_info[id].space()->contains(addr)) { |
2846 return SpaceId(id); | |
2847 } | |
2848 } | |
2849 | |
2850 assert(false, "no space contains the addr"); | |
2851 return last_space_id; | |
2852 } | |
2853 | |
2854 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2855 SpaceId id) { | |
2856 assert(id < last_space_id, "bad space id"); | |
2857 | |
2858 ParallelCompactData& sd = summary_data(); | |
2859 const SpaceInfo* const space_info = _space_info + id; | |
2860 ObjectStartArray* const start_array = space_info->start_array(); | |
2861 | |
2862 const MutableSpace* const space = space_info->space(); | |
2863 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2864 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2865 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2866 |
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2867 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2868 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2869 const RegionData* cur_region; |
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2870 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2871 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2872 if (addr != NULL) { |
2873 if (start_array != NULL) { | |
2874 start_array->allocate_block(addr); | |
2875 } | |
2876 oop(addr)->update_contents(cm); | |
2877 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2878 } | |
2879 } | |
2880 } | |
2881 | |
2882 // Skip over count live words starting from beg, and return the address of the | |
2883 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2884 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2885 // an object, or account for those live words in some other way. Callers must | |
2886 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2887 HeapWord* | |
2888 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2889 { | |
2890 assert(count > 0, "sanity"); | |
2891 | |
2892 ParMarkBitMap* m = mark_bitmap(); | |
2893 idx_t bits_to_skip = m->words_to_bits(count); | |
2894 idx_t cur_beg = m->addr_to_bit(beg); | |
2895 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2896 | |
2897 do { | |
2898 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2899 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2900 const size_t obj_bits = cur_end - cur_beg + 1; | |
2901 if (obj_bits > bits_to_skip) { | |
2902 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2903 } | |
2904 bits_to_skip -= obj_bits; | |
2905 cur_beg = cur_end + 1; | |
2906 } while (bits_to_skip > 0); | |
2907 | |
2908 // Skipping the desired number of words landed just past the end of an object. | |
2909 // Find the start of the next object. | |
2910 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2911 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2912 return m->bit_to_addr(cur_beg); | |
2913 } | |
2914 | |
482
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2915 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2916 SpaceId src_space_id, |
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2917 size_t src_region_idx) |
0 | 2918 { |
482
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2919 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2920 |
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2921 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2922 if (split_info.dest_region_addr() == dest_addr) { |
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2923 // The partial object ending at the split point contains the first word to |
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2924 // be copied to dest_addr. |
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2925 return split_info.first_src_addr(); |
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2926 } |
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2927 |
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2928 const ParallelCompactData& sd = summary_data(); |
0 | 2929 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2930 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2931 |
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2932 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2933 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2934 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2935 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2936 |
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2937 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2938 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2939 |
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2940 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2941 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2942 |
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2943 HeapWord* addr = src_region_beg; |
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2944 if (dest_addr == src_region_destination) { |
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2945 // Return the first live word in the source region. |
0 | 2946 if (partial_obj_size == 0) { |
375
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2947 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2948 assert(addr < src_region_end, "no objects start in src region"); |
0 | 2949 } |
2950 return addr; | |
2951 } | |
2952 | |
2953 // Must skip some live data. | |
375
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2954 size_t words_to_skip = dest_addr - src_region_destination; |
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2955 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 2956 |
2957 if (partial_obj_size >= words_to_skip) { | |
2958 // All the live words to skip are part of the partial object. | |
2959 addr += words_to_skip; | |
2960 if (partial_obj_size == words_to_skip) { | |
2961 // Find the first live word past the partial object. | |
375
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2962 addr = bitmap->find_obj_beg(addr, src_region_end); |
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2963 assert(addr < src_region_end, "wrong src region"); |
0 | 2964 } |
2965 return addr; | |
2966 } | |
2967 | |
2968 // Skip over the partial object (if any). | |
2969 if (partial_obj_size != 0) { | |
2970 words_to_skip -= partial_obj_size; | |
2971 addr += partial_obj_size; | |
2972 } | |
2973 | |
375
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2974 // Skip over live words due to objects that start in the region. |
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2975 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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2976 assert(addr < src_region_end, "wrong src region"); |
0 | 2977 return addr; |
2978 } | |
2979 | |
2980 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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2981 SpaceId src_space_id, |
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2982 size_t beg_region, |
0 | 2983 HeapWord* end_addr) |
2984 { | |
2985 ParallelCompactData& sd = summary_data(); | |
495
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2986 |
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2987 #ifdef ASSERT |
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2988 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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2989 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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2990 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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2991 "src_space_id does not match beg_addr"); |
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2992 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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2993 "src_space_id does not match end_addr"); |
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2994 #endif // #ifdef ASSERT |
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2995 |
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2996 RegionData* const beg = sd.region(beg_region); |
495
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2997 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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2998 |
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2999 // Regions up to new_top() are enqueued if they become available. |
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3000 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3001 RegionData* const enqueue_end = |
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3002 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3003 |
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3004 for (RegionData* cur = beg; cur < end; ++cur) { |
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3005 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3006 cur->decrement_destination_count(); |
495
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3007 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 3008 cm->push_region(sd.region(cur)); |
0 | 3009 } |
3010 } | |
3011 } | |
3012 | |
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3013 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3014 SpaceId& src_space_id, |
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3015 HeapWord*& src_space_top, |
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3016 HeapWord* end_addr) |
0 | 3017 { |
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3018 typedef ParallelCompactData::RegionData RegionData; |
0 | 3019 |
3020 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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3021 const size_t region_size = ParallelCompactData::RegionSize; |
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3022 |
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3023 size_t src_region_idx = 0; |
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3024 |
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3025 // Skip empty regions (if any) up to the top of the space. |
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3026 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3027 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3028 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3029 const RegionData* const top_region_ptr = |
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3030 sd.addr_to_region_ptr(top_aligned_up); |
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3031 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3032 ++src_region_ptr; |
0 | 3033 } |
3034 | |
375
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3035 if (src_region_ptr < top_region_ptr) { |
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3036 // The next source region is in the current space. Update src_region_idx |
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3037 // and the source address to match src_region_ptr. |
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3038 src_region_idx = sd.region(src_region_ptr); |
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3039 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3040 if (src_region_addr > closure.source()) { |
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3041 closure.set_source(src_region_addr); |
0 | 3042 } |
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3043 return src_region_idx; |
0 | 3044 } |
3045 | |
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3046 // Switch to a new source space and find the first non-empty region. |
0 | 3047 unsigned int space_id = src_space_id + 1; |
3048 assert(space_id < last_space_id, "not enough spaces"); | |
3049 | |
3050 HeapWord* const destination = closure.destination(); | |
3051 | |
3052 do { | |
3053 MutableSpace* space = _space_info[space_id].space(); | |
3054 HeapWord* const bottom = space->bottom(); | |
375
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3055 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3056 |
3057 // Iterate over the spaces that do not compact into themselves. | |
3058 if (bottom_cp->destination() != bottom) { | |
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3059 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3060 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3061 |
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3062 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3063 if (src_cp->live_obj_size() > 0) { |
3064 // Found it. | |
3065 assert(src_cp->destination() == destination, | |
3066 "first live obj in the space must match the destination"); | |
3067 assert(src_cp->partial_obj_size() == 0, | |
3068 "a space cannot begin with a partial obj"); | |
3069 | |
3070 src_space_id = SpaceId(space_id); | |
3071 src_space_top = space->top(); | |
375
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3072 const size_t src_region_idx = sd.region(src_cp); |
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3073 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3074 return src_region_idx; |
0 | 3075 } else { |
3076 assert(src_cp->data_size() == 0, "sanity"); | |
3077 } | |
3078 } | |
3079 } | |
3080 } while (++space_id < last_space_id); | |
3081 | |
375
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3082 assert(false, "no source region was found"); |
0 | 3083 return 0; |
3084 } | |
3085 | |
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3086 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3087 { |
3088 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
375
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3089 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3090 ParMarkBitMap* const bitmap = mark_bitmap(); |
3091 ParallelCompactData& sd = summary_data(); | |
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3092 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3093 |
3094 // Get the items needed to construct the closure. | |
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3095 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3096 SpaceId dest_space_id = space_id(dest_addr); |
3097 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3098 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3099 assert(dest_addr < new_top, "sanity"); | |
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3100 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3101 |
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3102 // Get the source region and related info. |
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3103 size_t src_region_idx = region_ptr->source_region(); |
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3104 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3105 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3106 | |
3107 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3108 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
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3109 |
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3110 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3111 // destination count is not decremented when a region is copied to itself). |
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3112 if (src_region_idx == region_idx) { |
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3113 src_region_idx += 1; |
0 | 3114 } |
3115 | |
3116 if (bitmap->is_unmarked(closure.source())) { | |
3117 // The first source word is in the middle of an object; copy the remainder | |
3118 // of the object or as much as will fit. The fact that pointer updates were | |
3119 // deferred will be noted when the object header is processed. | |
3120 HeapWord* const old_src_addr = closure.source(); | |
3121 closure.copy_partial_obj(); | |
3122 if (closure.is_full()) { | |
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3123 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3124 closure.source()); |
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3125 region_ptr->set_deferred_obj_addr(NULL); |
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3126 region_ptr->set_completed(); |
0 | 3127 return; |
3128 } | |
3129 | |
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3130 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3131 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3132 // The partial object was copied from more than one source region. |
495
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3133 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3134 |
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3135 // Move to the next source region, possibly switching spaces as well. All |
0 | 3136 // args except end_addr may be modified. |
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3137 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3138 end_addr); |
0 | 3139 } |
3140 } | |
3141 | |
3142 do { | |
3143 HeapWord* const cur_addr = closure.source(); | |
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3144 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3145 src_space_top); |
3146 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3147 | |
3148 if (status == ParMarkBitMap::incomplete) { | |
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3149 // The last obj that starts in the source region does not end in the |
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3150 // region. |
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3151 assert(closure.source() < end_addr, "sanity"); |
0 | 3152 HeapWord* const obj_beg = closure.source(); |
3153 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3154 src_space_top); | |
3155 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3156 if (obj_end < range_end) { | |
3157 // The end was found; the entire object will fit. | |
3158 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3159 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3160 } else { | |
3161 // The end was not found; the object will not fit. | |
3162 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3163 status = ParMarkBitMap::would_overflow; | |
3164 } | |
3165 } | |
3166 | |
3167 if (status == ParMarkBitMap::would_overflow) { | |
3168 // The last object did not fit. Note that interior oop updates were | |
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3169 // deferred, then copy enough of the object to fill the region. |
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3170 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3171 status = closure.copy_until_full(); // copies from closure.source() |
3172 | |
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3173 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3174 closure.source()); |
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3175 region_ptr->set_completed(); |
0 | 3176 return; |
3177 } | |
3178 | |
3179 if (status == ParMarkBitMap::full) { | |
495
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3180 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3181 closure.source()); |
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3182 region_ptr->set_deferred_obj_addr(NULL); |
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3183 region_ptr->set_completed(); |
0 | 3184 return; |
3185 } | |
3186 | |
495
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3187 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3188 |
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3189 // Move to the next source region, possibly switching spaces as well. All |
0 | 3190 // args except end_addr may be modified. |
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3191 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3192 end_addr); |
0 | 3193 } while (true); |
3194 } | |
3195 | |
10369
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3196 void PSParallelCompact::fill_blocks(size_t region_idx) |
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3197 { |
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3198 // Fill in the block table elements for the specified region. Each block |
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3199 // table element holds the number of live words in the region that are to the |
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3200 // left of the first object that starts in the block. Thus only blocks in |
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3201 // which an object starts need to be filled. |
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3202 // |
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3203 // The algorithm scans the section of the bitmap that corresponds to the |
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3204 // region, keeping a running total of the live words. When an object start is |
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3205 // found, if it's the first to start in the block that contains it, the |
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3206 // current total is written to the block table element. |
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3207 const size_t Log2BlockSize = ParallelCompactData::Log2BlockSize; |
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3208 const size_t Log2RegionSize = ParallelCompactData::Log2RegionSize; |
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3209 const size_t RegionSize = ParallelCompactData::RegionSize; |
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3210 |
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3211 ParallelCompactData& sd = summary_data(); |
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3212 const size_t partial_obj_size = sd.region(region_idx)->partial_obj_size(); |
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3213 if (partial_obj_size >= RegionSize) { |
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3214 return; // No objects start in this region. |
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|
3215 } |
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3216 |
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3217 // Ensure the first loop iteration decides that the block has changed. |
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3218 size_t cur_block = sd.block_count(); |
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3219 |
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3220 const ParMarkBitMap* const bitmap = mark_bitmap(); |
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3221 |
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3222 const size_t Log2BitsPerBlock = Log2BlockSize - LogMinObjAlignment; |
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3223 assert((size_t)1 << Log2BitsPerBlock == |
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3224 bitmap->words_to_bits(ParallelCompactData::BlockSize), "sanity"); |
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3225 |
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3226 size_t beg_bit = bitmap->words_to_bits(region_idx << Log2RegionSize); |
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3227 const size_t range_end = beg_bit + bitmap->words_to_bits(RegionSize); |
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3228 size_t live_bits = bitmap->words_to_bits(partial_obj_size); |
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3229 beg_bit = bitmap->find_obj_beg(beg_bit + live_bits, range_end); |
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3230 while (beg_bit < range_end) { |
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3231 const size_t new_block = beg_bit >> Log2BitsPerBlock; |
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3232 if (new_block != cur_block) { |
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3233 cur_block = new_block; |
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3234 sd.block(cur_block)->set_offset(bitmap->bits_to_words(live_bits)); |
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3235 } |
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3236 |
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3237 const size_t end_bit = bitmap->find_obj_end(beg_bit, range_end); |
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3238 if (end_bit < range_end - 1) { |
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3239 live_bits += end_bit - beg_bit + 1; |
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3240 beg_bit = bitmap->find_obj_beg(end_bit + 1, range_end); |
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3241 } else { |
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3242 return; |
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3243 } |
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3244 } |
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3245 } |
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3246 |
0 | 3247 void |
3248 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3249 const MutableSpace* sp = space(space_id); | |
3250 if (sp->is_empty()) { | |
3251 return; | |
3252 } | |
3253 | |
3254 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3255 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3256 HeapWord* const dp_addr = dense_prefix(space_id); | |
3257 HeapWord* beg_addr = sp->bottom(); | |
3258 HeapWord* end_addr = sp->top(); | |
3259 | |
3260 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3261 | |
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3262 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3263 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3264 if (beg_region < dp_region) { |
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3265 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3266 } |
3267 | |
375
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3268 // The destination of the first live object that starts in the region is one |
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3269 // past the end of the partial object entering the region (if any). |
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3270 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3271 HeapWord* const new_top = _space_info[space_id].new_top(); |
3272 assert(new_top >= dest_addr, "bad new_top value"); | |
3273 const size_t words = pointer_delta(new_top, dest_addr); | |
3274 | |
3275 if (words > 0) { | |
3276 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3277 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3278 | |
3279 ParMarkBitMap::IterationStatus status; | |
3280 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3281 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3282 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3283 "live objects skipped because closure is full"); | |
3284 } | |
3285 } | |
3286 | |
3287 jlong PSParallelCompact::millis_since_last_gc() { | |
4712
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3288 // We need a monotonically non-deccreasing time in ms but |
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3289 // os::javaTimeMillis() does not guarantee monotonicity. |
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3290 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3291 jlong ret_val = now - _time_of_last_gc; |
0 | 3292 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3293 if (ret_val < 0) { | |
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3294 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3295 return 0; |
3296 } | |
3297 return ret_val; | |
3298 } | |
3299 | |
3300 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3301 // We need a monotonically non-deccreasing time in ms but |
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3302 // os::javaTimeMillis() does not guarantee monotonicity. |
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3303 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3304 } |
3305 | |
3306 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3307 { | |
3308 if (source() != destination()) { | |
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3309 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3310 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3311 } | |
3312 update_state(words_remaining()); | |
3313 assert(is_full(), "sanity"); | |
3314 return ParMarkBitMap::full; | |
3315 } | |
3316 | |
3317 void MoveAndUpdateClosure::copy_partial_obj() | |
3318 { | |
3319 size_t words = words_remaining(); | |
3320 | |
3321 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3322 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3323 if (end_addr < range_end) { | |
3324 words = bitmap()->obj_size(source(), end_addr); | |
3325 } | |
3326 | |
3327 // This test is necessary; if omitted, the pointer updates to a partial object | |
3328 // that crosses the dense prefix boundary could be overwritten. | |
3329 if (source() != destination()) { | |
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3330 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3331 Copy::aligned_conjoint_words(source(), destination(), words); |
3332 } | |
3333 update_state(words); | |
3334 } | |
3335 | |
3336 ParMarkBitMapClosure::IterationStatus | |
3337 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3338 assert(destination() != NULL, "sanity"); | |
3339 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3340 | |
3341 _source = addr; | |
3342 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3343 destination(), "wrong destination"); | |
3344 | |
3345 if (words > words_remaining()) { | |
3346 return ParMarkBitMap::would_overflow; | |
3347 } | |
3348 | |
3349 // The start_array must be updated even if the object is not moving. | |
3350 if (_start_array != NULL) { | |
3351 _start_array->allocate_block(destination()); | |
3352 } | |
3353 | |
3354 if (destination() != source()) { | |
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3355 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3356 Copy::aligned_conjoint_words(source(), destination(), words); |
3357 } | |
3358 | |
3359 oop moved_oop = (oop) destination(); | |
3360 moved_oop->update_contents(compaction_manager()); | |
3361 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3362 | |
3363 update_state(words); | |
3364 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3365 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3366 } | |
3367 | |
3368 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3369 ParCompactionManager* cm, | |
3370 PSParallelCompact::SpaceId space_id) : | |
3371 ParMarkBitMapClosure(mbm, cm), | |
3372 _space_id(space_id), | |
3373 _start_array(PSParallelCompact::start_array(space_id)) | |
3374 { | |
3375 } | |
3376 | |
3377 // Updates the references in the object to their new values. | |
3378 ParMarkBitMapClosure::IterationStatus | |
3379 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3380 do_addr(addr); | |
3381 return ParMarkBitMap::incomplete; | |
3382 } |