Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 6922:cae17c597196
Merge
author | coleenp |
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date | Thu, 01 Nov 2012 11:57:53 -0400 |
parents | 4202510ee0fe |
children | d0aa87f04bd5 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
32 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
33 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
34 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" | |
35 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
36 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
37 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
38 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
39 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
40 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
41 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
42 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
43 #include "gc_interface/gcCause.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/referenceProcessor.hpp" | |
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47 #include "oops/methodData.hpp" |
1972 | 48 #include "oops/oop.inline.hpp" |
49 #include "oops/oop.pcgc.inline.hpp" | |
50 #include "runtime/fprofiler.hpp" | |
51 #include "runtime/safepoint.hpp" | |
52 #include "runtime/vmThread.hpp" | |
53 #include "services/management.hpp" | |
54 #include "services/memoryService.hpp" | |
6197 | 55 #include "services/memTracker.hpp" |
1972 | 56 #include "utilities/events.hpp" |
57 #include "utilities/stack.inline.hpp" | |
0 | 58 |
59 #include <math.h> | |
60 | |
61 // All sizes are in HeapWords. | |
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62 const size_t ParallelCompactData::Log2RegionSize = 9; // 512 words |
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63 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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64 const size_t ParallelCompactData::RegionSizeBytes = |
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65 RegionSize << LogHeapWordSize; |
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66 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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67 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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68 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
0 | 69 |
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70 const ParallelCompactData::RegionData::region_sz_t |
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71 ParallelCompactData::RegionData::dc_shift = 27; |
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72 |
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73 const ParallelCompactData::RegionData::region_sz_t |
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74 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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75 |
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76 const ParallelCompactData::RegionData::region_sz_t |
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77 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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78 |
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79 const ParallelCompactData::RegionData::region_sz_t |
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80 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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81 |
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82 const ParallelCompactData::RegionData::region_sz_t |
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83 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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84 |
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85 const ParallelCompactData::RegionData::region_sz_t |
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86 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 87 |
88 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
89 bool PSParallelCompact::_print_phases = false; | |
90 | |
91 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
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92 Klass* PSParallelCompact::_updated_int_array_klass_obj = NULL; |
0 | 93 |
94 double PSParallelCompact::_dwl_mean; | |
95 double PSParallelCompact::_dwl_std_dev; | |
96 double PSParallelCompact::_dwl_first_term; | |
97 double PSParallelCompact::_dwl_adjustment; | |
98 #ifdef ASSERT | |
99 bool PSParallelCompact::_dwl_initialized = false; | |
100 #endif // #ifdef ASSERT | |
101 | |
102 #ifdef VALIDATE_MARK_SWEEP | |
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103 GrowableArray<void*>* PSParallelCompact::_root_refs_stack = NULL; |
0 | 104 GrowableArray<oop> * PSParallelCompact::_live_oops = NULL; |
105 GrowableArray<oop> * PSParallelCompact::_live_oops_moved_to = NULL; | |
106 GrowableArray<size_t>* PSParallelCompact::_live_oops_size = NULL; | |
107 size_t PSParallelCompact::_live_oops_index = 0; | |
113
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108 GrowableArray<void*>* PSParallelCompact::_other_refs_stack = NULL; |
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109 GrowableArray<void*>* PSParallelCompact::_adjusted_pointers = NULL; |
0 | 110 bool PSParallelCompact::_pointer_tracking = false; |
111 bool PSParallelCompact::_root_tracking = true; | |
112 | |
113 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops = NULL; | |
114 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops_moved_to = NULL; | |
115 GrowableArray<size_t> * PSParallelCompact::_cur_gc_live_oops_size = NULL; | |
116 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops = NULL; | |
117 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops_moved_to = NULL; | |
118 GrowableArray<size_t> * PSParallelCompact::_last_gc_live_oops_size = NULL; | |
119 #endif | |
120 | |
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121 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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122 HeapWord* destination) |
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123 { |
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124 assert(src_region_idx != 0, "invalid src_region_idx"); |
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125 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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126 assert(destination != NULL, "invalid destination argument"); |
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127 |
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128 _src_region_idx = src_region_idx; |
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129 _partial_obj_size = partial_obj_size; |
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130 _destination = destination; |
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131 |
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132 // These fields may not be updated below, so make sure they're clear. |
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133 assert(_dest_region_addr == NULL, "should have been cleared"); |
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134 assert(_first_src_addr == NULL, "should have been cleared"); |
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135 |
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136 // Determine the number of destination regions for the partial object. |
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137 HeapWord* const last_word = destination + partial_obj_size - 1; |
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138 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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139 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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140 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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141 |
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142 if (beg_region_addr == end_region_addr) { |
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143 // One destination region. |
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144 _destination_count = 1; |
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145 if (end_region_addr == destination) { |
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146 // The destination falls on a region boundary, thus the first word of the |
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147 // partial object will be the first word copied to the destination region. |
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148 _dest_region_addr = end_region_addr; |
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149 _first_src_addr = sd.region_to_addr(src_region_idx); |
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150 } |
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151 } else { |
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152 // Two destination regions. When copied, the partial object will cross a |
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153 // destination region boundary, so a word somewhere within the partial |
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154 // object will be the first word copied to the second destination region. |
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155 _destination_count = 2; |
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156 _dest_region_addr = end_region_addr; |
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157 const size_t ofs = pointer_delta(end_region_addr, destination); |
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158 assert(ofs < _partial_obj_size, "sanity"); |
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159 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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160 } |
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161 } |
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162 |
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163 void SplitInfo::clear() |
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164 { |
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165 _src_region_idx = 0; |
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166 _partial_obj_size = 0; |
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167 _destination = NULL; |
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168 _destination_count = 0; |
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169 _dest_region_addr = NULL; |
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170 _first_src_addr = NULL; |
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171 assert(!is_valid(), "sanity"); |
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172 } |
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173 |
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174 #ifdef ASSERT |
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175 void SplitInfo::verify_clear() |
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176 { |
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177 assert(_src_region_idx == 0, "not clear"); |
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178 assert(_partial_obj_size == 0, "not clear"); |
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179 assert(_destination == NULL, "not clear"); |
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180 assert(_destination_count == 0, "not clear"); |
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181 assert(_dest_region_addr == NULL, "not clear"); |
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182 assert(_first_src_addr == NULL, "not clear"); |
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183 } |
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184 #endif // #ifdef ASSERT |
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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], |
375
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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 | |
375
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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; | |
375
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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) { | |
375
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241 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 242 if (c->data_size() != 0 || c->destination() != pdest) { |
375
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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 | |
375
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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 | |
375
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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 | |
375
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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; | |
375
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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 | |
375
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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. |
375
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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; | |
375
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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 | |
375
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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 _region_data = 0; |
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375 _region_count = 0; |
0 | 376 } |
377 | |
378 bool ParallelCompactData::initialize(MemRegion covered_region) | |
379 { | |
380 _region_start = covered_region.start(); | |
381 const size_t region_size = covered_region.word_size(); | |
382 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
383 | |
375
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384 assert(region_align_down(_region_start) == _region_start, |
0 | 385 "region start not aligned"); |
375
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386 assert((region_size & RegionSizeOffsetMask) == 0, |
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387 "region size not a multiple of RegionSize"); |
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388 |
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389 bool result = initialize_region_data(region_size); |
0 | 390 |
391 return result; | |
392 } | |
393 | |
394 PSVirtualSpace* | |
395 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
396 { | |
397 const size_t raw_bytes = count * element_size; | |
398 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
399 const size_t granularity = os::vm_allocation_granularity(); | |
400 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
401 | |
402 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
403 MAX2(page_sz, granularity); | |
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404 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 405 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
406 rs.size()); | |
6197 | 407 |
408 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
409 | |
0 | 410 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
411 if (vspace != 0) { | |
412 if (vspace->expand_by(bytes)) { | |
413 return vspace; | |
414 } | |
415 delete vspace; | |
237
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416 // Release memory reserved in the space. |
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417 rs.release(); |
0 | 418 } |
419 | |
420 return 0; | |
421 } | |
422 | |
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423 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 424 { |
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425 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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426 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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427 if (_region_vspace != 0) { |
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428 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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429 _region_count = count; |
0 | 430 return true; |
431 } | |
432 return false; | |
433 } | |
434 | |
435 void ParallelCompactData::clear() | |
436 { | |
375
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437 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 438 } |
439 | |
375
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440 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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441 assert(beg_region <= _region_count, "beg_region out of range"); |
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442 assert(end_region <= _region_count, "end_region out of range"); |
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443 |
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444 const size_t region_cnt = end_region - beg_region; |
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445 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 446 } |
447 | |
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448 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 449 { |
375
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450 const RegionData* cur_cp = region(region_idx); |
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451 const RegionData* const end_cp = region(region_count() - 1); |
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452 |
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453 HeapWord* result = region_to_addr(region_idx); |
0 | 454 if (cur_cp < end_cp) { |
455 do { | |
456 result += cur_cp->partial_obj_size(); | |
375
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457 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 458 } |
459 return result; | |
460 } | |
461 | |
462 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
463 { | |
464 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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465 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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466 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 467 |
468 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
469 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
470 | |
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471 if (beg_region == end_region) { |
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472 // All in one region. |
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473 _region_data[beg_region].add_live_obj(len); |
0 | 474 return; |
475 } | |
476 | |
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477 // First region. |
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478 const size_t beg_ofs = region_offset(addr); |
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479 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 480 |
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481 Klass* klass = ((oop)addr)->klass(); |
375
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482 // Middle regions--completely spanned by this object. |
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483 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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484 _region_data[region].set_partial_obj_size(RegionSize); |
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485 _region_data[region].set_partial_obj_addr(addr); |
0 | 486 } |
487 | |
375
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488 // Last region. |
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489 const size_t end_ofs = region_offset(addr + len - 1); |
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490 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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491 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 492 } |
493 | |
494 void | |
495 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
496 { | |
375
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497 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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498 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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499 |
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500 size_t cur_region = addr_to_region_idx(beg); |
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501 const size_t end_region = addr_to_region_idx(end); |
0 | 502 HeapWord* addr = beg; |
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503 while (cur_region < end_region) { |
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504 _region_data[cur_region].set_destination(addr); |
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505 _region_data[cur_region].set_destination_count(0); |
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506 _region_data[cur_region].set_source_region(cur_region); |
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507 _region_data[cur_region].set_data_location(addr); |
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508 |
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509 // Update live_obj_size so the region appears completely full. |
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510 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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511 _region_data[cur_region].set_live_obj_size(live_size); |
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512 |
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513 ++cur_region; |
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514 addr += RegionSize; |
0 | 515 } |
516 } | |
517 | |
482
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518 // Find the point at which a space can be split and, if necessary, record the |
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519 // split point. |
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520 // |
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521 // If the current src region (which overflowed the destination space) doesn't |
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522 // have a partial object, the split point is at the beginning of the current src |
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523 // region (an "easy" split, no extra bookkeeping required). |
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524 // |
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525 // If the current src region has a partial object, the split point is in the |
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526 // region where that partial object starts (call it the split_region). If |
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527 // split_region has a partial object, then the split point is just after that |
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528 // partial object (a "hard" split where we have to record the split data and |
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529 // zero the partial_obj_size field). With a "hard" split, we know that the |
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530 // partial_obj ends within split_region because the partial object that caused |
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531 // the overflow starts in split_region. If split_region doesn't have a partial |
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532 // obj, then the split is at the beginning of split_region (another "easy" |
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533 // split). |
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534 HeapWord* |
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535 ParallelCompactData::summarize_split_space(size_t src_region, |
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536 SplitInfo& split_info, |
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537 HeapWord* destination, |
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538 HeapWord* target_end, |
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539 HeapWord** target_next) |
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540 { |
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541 assert(destination <= target_end, "sanity"); |
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542 assert(destination + _region_data[src_region].data_size() > target_end, |
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543 "region should not fit into target space"); |
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544 assert(is_region_aligned(target_end), "sanity"); |
482
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545 |
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546 size_t split_region = src_region; |
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547 HeapWord* split_destination = destination; |
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548 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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549 |
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550 if (destination + partial_obj_size > target_end) { |
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551 // The split point is just after the partial object (if any) in the |
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552 // src_region that contains the start of the object that overflowed the |
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553 // destination space. |
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554 // |
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555 // Find the start of the "overflow" object and set split_region to the |
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556 // region containing it. |
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557 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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558 split_region = addr_to_region_idx(overflow_obj); |
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559 |
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560 // Clear the source_region field of all destination regions whose first word |
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561 // came from data after the split point (a non-null source_region field |
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562 // implies a region must be filled). |
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563 // |
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564 // An alternative to the simple loop below: clear during post_compact(), |
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565 // which uses memcpy instead of individual stores, and is easy to |
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566 // parallelize. (The downside is that it clears the entire RegionData |
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567 // object as opposed to just one field.) |
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568 // |
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569 // post_compact() would have to clear the summary data up to the highest |
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570 // address that was written during the summary phase, which would be |
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571 // |
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572 // max(top, max(new_top, clear_top)) |
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573 // |
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574 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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575 // to target_end. |
482
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576 const RegionData* const sr = region(split_region); |
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577 const size_t beg_idx = |
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578 addr_to_region_idx(region_align_up(sr->destination() + |
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579 sr->partial_obj_size())); |
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580 const size_t end_idx = addr_to_region_idx(target_end); |
482
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581 |
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582 if (TraceParallelOldGCSummaryPhase) { |
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583 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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584 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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585 beg_idx, end_idx); |
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586 } |
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587 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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588 _region_data[idx].set_source_region(0); |
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589 } |
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590 |
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591 // Set split_destination and partial_obj_size to reflect the split region. |
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592 split_destination = sr->destination(); |
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593 partial_obj_size = sr->partial_obj_size(); |
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594 } |
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595 |
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596 // The split is recorded only if a partial object extends onto the region. |
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597 if (partial_obj_size != 0) { |
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598 _region_data[split_region].set_partial_obj_size(0); |
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599 split_info.record(split_region, partial_obj_size, split_destination); |
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600 } |
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601 |
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602 // Setup the continuation addresses. |
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603 *target_next = split_destination + partial_obj_size; |
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604 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 605 |
606 if (TraceParallelOldGCSummaryPhase) { | |
482
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607 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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608 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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609 " pos=" SIZE_FORMAT, |
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610 split_type, source_next, split_region, |
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611 partial_obj_size); |
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612 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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613 " tn=" PTR_FORMAT, |
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614 split_type, split_destination, |
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615 addr_to_region_idx(split_destination), |
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616 *target_next); |
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617 |
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618 if (partial_obj_size != 0) { |
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619 HeapWord* const po_beg = split_info.destination(); |
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620 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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621 gclog_or_tty->print_cr("%s split: " |
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622 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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623 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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624 split_type, |
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625 po_beg, addr_to_region_idx(po_beg), |
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626 po_end, addr_to_region_idx(po_end)); |
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627 } |
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628 } |
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629 |
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630 return source_next; |
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631 } |
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632 |
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633 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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634 HeapWord* source_beg, HeapWord* source_end, |
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635 HeapWord** source_next, |
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636 HeapWord* target_beg, HeapWord* target_end, |
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637 HeapWord** target_next) |
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638 { |
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639 if (TraceParallelOldGCSummaryPhase) { |
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640 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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641 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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642 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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643 source_beg, source_end, source_next_val, |
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644 target_beg, target_end, *target_next); |
0 | 645 } |
646 | |
375
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647 size_t cur_region = addr_to_region_idx(source_beg); |
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648 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 649 |
650 HeapWord *dest_addr = target_beg; | |
375
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651 while (cur_region < end_region) { |
482
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652 // The destination must be set even if the region has no data. |
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653 _region_data[cur_region].set_destination(dest_addr); |
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654 |
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655 size_t words = _region_data[cur_region].data_size(); |
0 | 656 if (words > 0) { |
482
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657 // If cur_region does not fit entirely into the target space, find a point |
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658 // at which the source space can be 'split' so that part is copied to the |
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659 // target space and the rest is copied elsewhere. |
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660 if (dest_addr + words > target_end) { |
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661 assert(source_next != NULL, "source_next is NULL when splitting"); |
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662 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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663 target_end, target_next); |
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664 return false; |
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665 } |
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666 |
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667 // Compute the destination_count for cur_region, and if necessary, update |
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668 // source_region for a destination region. The source_region field is |
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669 // updated if cur_region is the first (left-most) region to be copied to a |
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670 // destination region. |
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671 // |
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672 // The destination_count calculation is a bit subtle. A region that has |
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673 // data that compacts into itself does not count itself as a destination. |
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674 // This maintains the invariant that a zero count means the region is |
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675 // available and can be claimed and then filled. |
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676 uint destination_count = 0; |
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677 if (split_info.is_split(cur_region)) { |
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678 // The current region has been split: the partial object will be copied |
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679 // to one destination space and the remaining data will be copied to |
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680 // another destination space. Adjust the initial destination_count and, |
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681 // if necessary, set the source_region field if the partial object will |
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682 // cross a destination region boundary. |
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683 destination_count = split_info.destination_count(); |
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684 if (destination_count == 2) { |
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685 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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686 _region_data[dest_idx].set_source_region(cur_region); |
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687 } |
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688 } |
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689 |
0 | 690 HeapWord* const last_addr = dest_addr + words - 1; |
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691 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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692 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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693 |
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694 // Initially assume that the destination regions will be the same and |
0 | 695 // adjust the value below if necessary. Under this assumption, if |
375
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696 // cur_region == dest_region_2, then cur_region will be compacted |
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697 // completely into itself. |
482
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698 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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699 if (dest_region_1 != dest_region_2) { |
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700 // Destination regions differ; adjust destination_count. |
0 | 701 destination_count += 1; |
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702 // Data from cur_region will be copied to the start of dest_region_2. |
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703 _region_data[dest_region_2].set_source_region(cur_region); |
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704 } else if (region_offset(dest_addr) == 0) { |
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705 // Data from cur_region will be copied to the start of the destination |
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706 // region. |
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707 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 708 } |
709 | |
375
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710 _region_data[cur_region].set_destination_count(destination_count); |
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711 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 712 dest_addr += words; |
713 } | |
714 | |
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715 ++cur_region; |
0 | 716 } |
717 | |
718 *target_next = dest_addr; | |
719 return true; | |
720 } | |
721 | |
722 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
723 assert(addr != NULL, "Should detect NULL oop earlier"); | |
724 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
725 #ifdef ASSERT | |
726 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
727 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
728 } | |
729 #endif | |
730 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
731 | |
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732 // Region covering the object. |
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733 size_t region_index = addr_to_region_idx(addr); |
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734 const RegionData* const region_ptr = region(region_index); |
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735 HeapWord* const region_addr = region_align_down(addr); |
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736 |
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737 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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738 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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739 |
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740 HeapWord* result = region_ptr->destination(); |
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741 |
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742 // If all the data in the region is live, then the new location of the object |
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743 // can be calculated from the destination of the region plus the offset of the |
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744 // object in the region. |
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745 if (region_ptr->data_size() == RegionSize) { |
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746 result += pointer_delta(addr, region_addr); |
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747 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 748 return result; |
749 } | |
750 | |
751 // The new location of the object is | |
375
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752 // region destination + |
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753 // size of the partial object extending onto the region + |
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754 // sizes of the live objects in the Region that are to the left of addr |
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755 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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756 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 757 |
758 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
759 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
760 | |
761 result += partial_obj_size + live_to_left; | |
495
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762 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 763 return result; |
764 } | |
765 | |
766 #ifdef ASSERT | |
767 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
768 { | |
769 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
770 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
771 for (const size_t* p = beg; p < end; ++p) { | |
772 assert(*p == 0, "not zero"); | |
773 } | |
774 } | |
775 | |
776 void ParallelCompactData::verify_clear() | |
777 { | |
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778 verify_clear(_region_vspace); |
0 | 779 } |
780 #endif // #ifdef ASSERT | |
781 | |
782 #ifdef NOT_PRODUCT | |
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783 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 784 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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785 return sd.region(region_index); |
0 | 786 } |
787 #endif | |
788 | |
789 elapsedTimer PSParallelCompact::_accumulated_time; | |
790 unsigned int PSParallelCompact::_total_invocations = 0; | |
791 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
792 jlong PSParallelCompact::_time_of_last_gc = 0; | |
793 CollectorCounters* PSParallelCompact::_counters = NULL; | |
794 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
795 ParallelCompactData PSParallelCompact::_summary_data; | |
796 | |
797 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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798 |
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799 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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800 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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801 |
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802 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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803 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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804 |
0 | 805 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_root_pointer_closure(true); |
806 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure(false); | |
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807 PSParallelCompact::AdjustKlassClosure PSParallelCompact::_adjust_klass_closure; |
0 | 808 |
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809 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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810 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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811 |
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812 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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813 |
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814 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { |
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815 mark_and_push(_compaction_manager, p); |
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816 } |
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817 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 818 |
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819 void PSParallelCompact::FollowKlassClosure::do_klass(Klass* klass) { |
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820 klass->oops_do(_mark_and_push_closure); |
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821 } |
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822 void PSParallelCompact::AdjustKlassClosure::do_klass(Klass* klass) { |
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823 klass->oops_do(&PSParallelCompact::_adjust_root_pointer_closure); |
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824 } |
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825 |
0 | 826 void PSParallelCompact::post_initialize() { |
827 ParallelScavengeHeap* heap = gc_heap(); | |
828 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
829 | |
830 MemRegion mr = heap->reserved_region(); | |
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831 _ref_processor = |
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832 new ReferenceProcessor(mr, // span |
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833 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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834 (int) ParallelGCThreads, // mt processing degree |
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835 true, // mt discovery |
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836 (int) ParallelGCThreads, // mt discovery degree |
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837 true, // atomic_discovery |
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838 &_is_alive_closure, // non-header is alive closure |
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839 false); // write barrier for next field updates |
0 | 840 _counters = new CollectorCounters("PSParallelCompact", 1); |
841 | |
842 // Initialize static fields in ParCompactionManager. | |
843 ParCompactionManager::initialize(mark_bitmap()); | |
844 } | |
845 | |
846 bool PSParallelCompact::initialize() { | |
847 ParallelScavengeHeap* heap = gc_heap(); | |
848 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
849 MemRegion mr = heap->reserved_region(); | |
850 | |
851 // Was the old gen get allocated successfully? | |
852 if (!heap->old_gen()->is_allocated()) { | |
853 return false; | |
854 } | |
855 | |
856 initialize_space_info(); | |
857 initialize_dead_wood_limiter(); | |
858 | |
859 if (!_mark_bitmap.initialize(mr)) { | |
860 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
861 "parallel garbage collection for the requested heap size."); | |
862 return false; | |
863 } | |
864 | |
865 if (!_summary_data.initialize(mr)) { | |
866 vm_shutdown_during_initialization("Unable to allocate tables for " | |
867 "parallel garbage collection for the requested heap size."); | |
868 return false; | |
869 } | |
870 | |
871 return true; | |
872 } | |
873 | |
874 void PSParallelCompact::initialize_space_info() | |
875 { | |
876 memset(&_space_info, 0, sizeof(_space_info)); | |
877 | |
878 ParallelScavengeHeap* heap = gc_heap(); | |
879 PSYoungGen* young_gen = heap->young_gen(); | |
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880 |
0 | 881 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); |
882 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
883 _space_info[from_space_id].set_space(young_gen->from_space()); | |
884 _space_info[to_space_id].set_space(young_gen->to_space()); | |
885 | |
886 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
887 } | |
888 | |
889 void PSParallelCompact::initialize_dead_wood_limiter() | |
890 { | |
891 const size_t max = 100; | |
892 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
893 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
894 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
895 DEBUG_ONLY(_dwl_initialized = true;) | |
896 _dwl_adjustment = normal_distribution(1.0); | |
897 } | |
898 | |
899 // Simple class for storing info about the heap at the start of GC, to be used | |
900 // after GC for comparison/printing. | |
901 class PreGCValues { | |
902 public: | |
903 PreGCValues() { } | |
904 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
905 | |
906 void fill(ParallelScavengeHeap* heap) { | |
907 _heap_used = heap->used(); | |
908 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
909 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
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910 _metadata_used = MetaspaceAux::used_in_bytes(); |
0 | 911 }; |
912 | |
913 size_t heap_used() const { return _heap_used; } | |
914 size_t young_gen_used() const { return _young_gen_used; } | |
915 size_t old_gen_used() const { return _old_gen_used; } | |
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916 size_t metadata_used() const { return _metadata_used; } |
0 | 917 |
918 private: | |
919 size_t _heap_used; | |
920 size_t _young_gen_used; | |
921 size_t _old_gen_used; | |
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922 size_t _metadata_used; |
0 | 923 }; |
924 | |
925 void | |
926 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
927 { | |
928 // At this point, top is the value before GC, new_top() is the value that will | |
929 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
930 // should be marked above top. The summary data is cleared to the larger of | |
931 // top & new_top. | |
932 MutableSpace* const space = _space_info[id].space(); | |
933 HeapWord* const bot = space->bottom(); | |
934 HeapWord* const top = space->top(); | |
935 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
936 | |
937 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
938 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
939 _mark_bitmap.clear_range(beg_bit, end_bit); | |
940 | |
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941 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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942 const size_t end_region = |
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943 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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944 _summary_data.clear_range(beg_region, end_region); |
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945 |
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946 // Clear the data used to 'split' regions. |
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947 SplitInfo& split_info = _space_info[id].split_info(); |
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948 if (split_info.is_valid()) { |
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949 split_info.clear(); |
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950 } |
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951 DEBUG_ONLY(split_info.verify_clear();) |
0 | 952 } |
953 | |
954 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
955 { | |
956 // Update the from & to space pointers in space_info, since they are swapped | |
957 // at each young gen gc. Do the update unconditionally (even though a | |
958 // promotion failure does not swap spaces) because an unknown number of minor | |
959 // collections will have swapped the spaces an unknown number of times. | |
960 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
961 ParallelScavengeHeap* heap = gc_heap(); | |
962 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
963 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
964 | |
965 pre_gc_values->fill(heap); | |
966 | |
967 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
968 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
969 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
970 | |
971 // Increment the invocation count | |
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972 heap->increment_total_collections(true); |
0 | 973 |
974 // We need to track unique mark sweep invocations as well. | |
975 _total_invocations++; | |
976 | |
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977 heap->print_heap_before_gc(); |
0 | 978 |
979 // Fill in TLABs | |
980 heap->accumulate_statistics_all_tlabs(); | |
981 heap->ensure_parsability(true); // retire TLABs | |
982 | |
983 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
984 HandleMark hm; // Discard invalid handles created during verification | |
985 gclog_or_tty->print(" VerifyBeforeGC:"); | |
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986 Universe::verify(); |
0 | 987 } |
988 | |
989 // Verify object start arrays | |
990 if (VerifyObjectStartArray && | |
991 VerifyBeforeGC) { | |
992 heap->old_gen()->verify_object_start_array(); | |
993 } | |
994 | |
995 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
996 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 997 |
998 // Have worker threads release resources the next time they run a task. | |
999 gc_task_manager()->release_all_resources(); | |
0 | 1000 } |
1001 | |
1002 void PSParallelCompact::post_compact() | |
1003 { | |
1004 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
1005 | |
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1006 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
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1007 // Clear the marking bitmap, summary data and split info. |
0 | 1008 clear_data_covering_space(SpaceId(id)); |
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1009 // Update top(). Must be done after clearing the bitmap and summary data. |
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1010 _space_info[id].publish_new_top(); |
0 | 1011 } |
1012 | |
1013 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1014 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1015 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1016 | |
1017 ParallelScavengeHeap* heap = gc_heap(); | |
1018 bool eden_empty = eden_space->is_empty(); | |
1019 if (!eden_empty) { | |
1020 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1021 heap->young_gen(), heap->old_gen()); | |
1022 } | |
1023 | |
1024 // Update heap occupancy information which is used as input to the soft ref | |
1025 // clearing policy at the next gc. | |
1026 Universe::update_heap_info_at_gc(); | |
1027 | |
1028 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1029 to_space->is_empty(); | |
1030 | |
1031 BarrierSet* bs = heap->barrier_set(); | |
1032 if (bs->is_a(BarrierSet::ModRef)) { | |
1033 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1034 MemRegion old_mr = heap->old_gen()->reserved(); | |
1035 | |
1036 if (young_gen_empty) { | |
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1037 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1038 } else { |
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1039 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 1040 } |
1041 } | |
1042 | |
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1043 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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1044 ClassLoaderDataGraph::purge(); |
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1045 |
0 | 1046 Threads::gc_epilogue(); |
1047 CodeCache::gc_epilogue(); | |
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1048 JvmtiExport::gc_epilogue(); |
0 | 1049 |
1050 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1051 | |
1052 ref_processor()->enqueue_discovered_references(NULL); | |
1053 | |
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1054 if (ZapUnusedHeapArea) { |
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1055 heap->gen_mangle_unused_area(); |
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1056 } |
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1057 |
0 | 1058 // Update time of last GC |
1059 reset_millis_since_last_gc(); | |
1060 } | |
1061 | |
1062 HeapWord* | |
1063 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1064 bool maximum_compaction) | |
1065 { | |
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1066 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1067 const ParallelCompactData& sd = summary_data(); |
1068 | |
1069 const MutableSpace* const space = _space_info[id].space(); | |
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1070 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1071 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1072 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1073 |
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1074 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1075 // of the dense prefix. |
1076 size_t full_count = 0; | |
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1077 const RegionData* cp; |
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1078 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1079 ++full_count; |
1080 } | |
1081 | |
1082 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1083 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1084 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1085 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1086 _maximum_compaction_gc_num = total_invocations(); | |
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1087 return sd.region_to_addr(cp); |
0 | 1088 } |
1089 | |
1090 HeapWord* const new_top = _space_info[id].new_top(); | |
1091 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1092 const size_t space_used = space->used_in_words(); | |
1093 const size_t space_capacity = space->capacity_in_words(); | |
1094 | |
1095 const double cur_density = double(space_live) / space_capacity; | |
1096 const double deadwood_density = | |
1097 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1098 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1099 | |
1100 if (TraceParallelOldGCDensePrefix) { | |
1101 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1102 cur_density, deadwood_density, deadwood_goal); | |
1103 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1104 "space_cap=" SIZE_FORMAT, | |
1105 space_live, space_used, | |
1106 space_capacity); | |
1107 } | |
1108 | |
1109 // XXX - Use binary search? | |
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1110 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1111 const RegionData* full_cp = cp; |
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1112 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1113 while (cp < end_cp) { |
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1114 HeapWord* region_destination = cp->destination(); |
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1115 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1116 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1117 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1118 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1119 sd.region(cp), region_destination, |
0 | 1120 dense_prefix, cur_deadwood); |
1121 } | |
1122 | |
1123 if (cur_deadwood >= deadwood_goal) { | |
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1124 // Found the region that has the correct amount of deadwood to the left. |
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1125 // This typically occurs after crossing a fairly sparse set of regions, so |
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1126 // iterate backwards over those sparse regions, looking for the region |
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1127 // that has the lowest density of live objects 'to the right.' |
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1128 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1129 size_t live_to_left = space_to_left - cur_deadwood; |
1130 size_t space_to_right = space_capacity - space_to_left; | |
1131 size_t live_to_right = space_live - live_to_left; | |
1132 double density_to_right = double(live_to_right) / space_to_right; | |
1133 while (cp > full_cp) { | |
1134 --cp; | |
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1135 const size_t prev_region_live_to_right = live_to_right - |
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1136 cp->data_size(); |
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1137 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1138 double prev_region_density_to_right = |
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1139 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1140 if (density_to_right <= prev_region_density_to_right) { |
0 | 1141 return dense_prefix; |
1142 } | |
1143 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1144 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1145 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1146 prev_region_density_to_right); |
0 | 1147 } |
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1148 dense_prefix -= region_size; |
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1149 live_to_right = prev_region_live_to_right; |
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1150 space_to_right = prev_region_space_to_right; |
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1151 density_to_right = prev_region_density_to_right; |
0 | 1152 } |
1153 return dense_prefix; | |
1154 } | |
1155 | |
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1156 dense_prefix += region_size; |
0 | 1157 ++cp; |
1158 } | |
1159 | |
1160 return dense_prefix; | |
1161 } | |
1162 | |
1163 #ifndef PRODUCT | |
1164 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1165 const SpaceId id, | |
1166 const bool maximum_compaction, | |
1167 HeapWord* const addr) | |
1168 { | |
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1169 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1170 RegionData* const cp = summary_data().region(region_idx); |
0 | 1171 const MutableSpace* const space = _space_info[id].space(); |
1172 HeapWord* const new_top = _space_info[id].new_top(); | |
1173 | |
1174 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1175 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1176 const size_t space_cap = space->capacity_in_words(); | |
1177 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1178 const size_t live_to_right = new_top - cp->destination(); | |
1179 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1180 | |
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1181 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1182 "spl=" SIZE_FORMAT " " |
1183 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1184 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1185 " ratio=%10.8f", | |
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1186 algorithm, addr, region_idx, |
0 | 1187 space_live, |
1188 dead_to_left, dead_to_left_pct, | |
1189 dead_to_right, live_to_right, | |
1190 double(dead_to_right) / live_to_right); | |
1191 } | |
1192 #endif // #ifndef PRODUCT | |
1193 | |
1194 // Return a fraction indicating how much of the generation can be treated as | |
1195 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1196 // based on the density of live objects in the generation to determine a limit, | |
1197 // which is then adjusted so the return value is min_percent when the density is | |
1198 // 1. | |
1199 // | |
1200 // The following table shows some return values for a different values of the | |
1201 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1202 // min_percent is 1. | |
1203 // | |
1204 // fraction allowed as dead wood | |
1205 // ----------------------------------------------------------------- | |
1206 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1207 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1208 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1209 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1210 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1211 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1212 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1213 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1214 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1215 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1216 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1217 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1218 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1219 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1220 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1221 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1222 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1223 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1224 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1225 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1226 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1227 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1228 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1229 | |
1230 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1231 { | |
1232 assert(_dwl_initialized, "uninitialized"); | |
1233 | |
1234 // The raw limit is the value of the normal distribution at x = density. | |
1235 const double raw_limit = normal_distribution(density); | |
1236 | |
1237 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1238 // | |
1239 // First subtract the adjustment value (which is simply the precomputed value | |
1240 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1241 // Then add the minimum value, so the minimum is returned when the density is | |
1242 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1243 const double min = double(min_percent) / 100.0; | |
1244 const double limit = raw_limit - _dwl_adjustment + min; | |
1245 return MAX2(limit, 0.0); | |
1246 } | |
1247 | |
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1248 ParallelCompactData::RegionData* |
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1249 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1250 const RegionData* end) |
0 | 1251 { |
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1252 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1253 ParallelCompactData& sd = summary_data(); |
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1254 size_t left = sd.region(beg); |
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1255 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1256 |
1257 // Binary search. | |
1258 while (left < right) { | |
1259 // Equivalent to (left + right) / 2, but does not overflow. | |
1260 const size_t middle = left + (right - left) / 2; | |
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1261 RegionData* const middle_ptr = sd.region(middle); |
0 | 1262 HeapWord* const dest = middle_ptr->destination(); |
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1263 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1264 assert(dest != NULL, "sanity"); |
1265 assert(dest <= addr, "must move left"); | |
1266 | |
1267 if (middle > left && dest < addr) { | |
1268 right = middle - 1; | |
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1269 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1270 left = middle + 1; |
1271 } else { | |
1272 return middle_ptr; | |
1273 } | |
1274 } | |
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1275 return sd.region(left); |
0 | 1276 } |
1277 | |
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1278 ParallelCompactData::RegionData* |
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1279 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1280 const RegionData* end, |
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1281 size_t dead_words) |
0 | 1282 { |
1283 ParallelCompactData& sd = summary_data(); | |
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1284 size_t left = sd.region(beg); |
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1285 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1286 |
1287 // Binary search. | |
1288 while (left < right) { | |
1289 // Equivalent to (left + right) / 2, but does not overflow. | |
1290 const size_t middle = left + (right - left) / 2; | |
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1291 RegionData* const middle_ptr = sd.region(middle); |
0 | 1292 HeapWord* const dest = middle_ptr->destination(); |
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1293 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1294 assert(dest != NULL, "sanity"); |
1295 assert(dest <= addr, "must move left"); | |
1296 | |
1297 const size_t dead_to_left = pointer_delta(addr, dest); | |
1298 if (middle > left && dead_to_left > dead_words) { | |
1299 right = middle - 1; | |
1300 } else if (middle < right && dead_to_left < dead_words) { | |
1301 left = middle + 1; | |
1302 } else { | |
1303 return middle_ptr; | |
1304 } | |
1305 } | |
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1306 return sd.region(left); |
0 | 1307 } |
1308 | |
1309 // The result is valid during the summary phase, after the initial summarization | |
1310 // of each space into itself, and before final summarization. | |
1311 inline double | |
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1312 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1313 HeapWord* const bottom, |
1314 HeapWord* const top, | |
1315 HeapWord* const new_top) | |
1316 { | |
1317 ParallelCompactData& sd = summary_data(); | |
1318 | |
1319 assert(cp != NULL, "sanity"); | |
1320 assert(bottom != NULL, "sanity"); | |
1321 assert(top != NULL, "sanity"); | |
1322 assert(new_top != NULL, "sanity"); | |
1323 assert(top >= new_top, "summary data problem?"); | |
1324 assert(new_top > bottom, "space is empty; should not be here"); | |
1325 assert(new_top >= cp->destination(), "sanity"); | |
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1326 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1327 |
1328 HeapWord* const destination = cp->destination(); | |
1329 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1330 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1331 const size_t compacted_region_used = pointer_delta(top, |
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1332 sd.region_to_addr(cp)); |
0 | 1333 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1334 | |
1335 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1336 return double(reclaimable) / divisor; | |
1337 } | |
1338 | |
1339 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1340 // compacted region. The address is always on a region boundary. |
0 | 1341 // |
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1342 // Completely full regions at the left are skipped, since no compaction can |
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1343 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1344 // computed, based on the density (amount live / capacity) of the generation; |
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1345 // the region with approximately that amount of dead space to the left is |
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1346 // identified as the limit region. Regions between the last completely full |
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1347 // region and the limit region are scanned and the one that has the best |
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1348 // (maximum) reclaimed_ratio() is selected. |
0 | 1349 HeapWord* |
1350 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1351 bool maximum_compaction) | |
1352 { | |
483
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1353 if (ParallelOldGCSplitALot) { |
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1354 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1355 // The value was chosen to provoke splitting a young gen space; use it. |
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1356 return _space_info[id].dense_prefix(); |
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1357 } |
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1358 } |
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1359 |
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1360 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1361 const ParallelCompactData& sd = summary_data(); |
1362 | |
1363 const MutableSpace* const space = _space_info[id].space(); | |
1364 HeapWord* const top = space->top(); | |
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1365 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1366 HeapWord* const new_top = _space_info[id].new_top(); |
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1367 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1368 HeapWord* const bottom = space->bottom(); |
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1369 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1370 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1371 const RegionData* const new_top_cp = |
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1372 sd.addr_to_region_ptr(new_top_aligned_up); |
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1373 |
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1374 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1375 // of the dense prefix. |
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1376 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1377 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1378 space->is_empty(), "no dead space allowed to the left"); |
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1379 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1380 "region must have dead space"); |
0 | 1381 |
1382 // The gc number is saved whenever a maximum compaction is done, and used to | |
1383 // determine when the maximum compaction interval has expired. This avoids | |
1384 // successive max compactions for different reasons. | |
1385 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1386 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1387 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1388 total_invocations() == HeapFirstMaximumCompactionCount; | |
1389 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1390 _maximum_compaction_gc_num = total_invocations(); | |
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1391 return sd.region_to_addr(full_cp); |
0 | 1392 } |
1393 | |
1394 const size_t space_live = pointer_delta(new_top, bottom); | |
1395 const size_t space_used = space->used_in_words(); | |
1396 const size_t space_capacity = space->capacity_in_words(); | |
1397 | |
1398 const double density = double(space_live) / double(space_capacity); | |
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1399 const size_t min_percent_free = MarkSweepDeadRatio; |
0 | 1400 const double limiter = dead_wood_limiter(density, min_percent_free); |
1401 const size_t dead_wood_max = space_used - space_live; | |
1402 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1403 dead_wood_max); | |
1404 | |
1405 if (TraceParallelOldGCDensePrefix) { | |
1406 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1407 "space_cap=" SIZE_FORMAT, | |
1408 space_live, space_used, | |
1409 space_capacity); | |
1410 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1411 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1412 density, min_percent_free, limiter, | |
1413 dead_wood_max, dead_wood_limit); | |
1414 } | |
1415 | |
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1416 // Locate the region with the desired amount of dead space to the left. |
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1417 const RegionData* const limit_cp = |
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1418 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1419 |
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1420 // Scan from the first region with dead space to the limit region and find the |
0 | 1421 // one with the best (largest) reclaimed ratio. |
1422 double best_ratio = 0.0; | |
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1423 const RegionData* best_cp = full_cp; |
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1424 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1425 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1426 if (tmp_ratio > best_ratio) { | |
1427 best_cp = cp; | |
1428 best_ratio = tmp_ratio; | |
1429 } | |
1430 } | |
1431 | |
1432 #if 0 | |
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1433 // Something to consider: if the region with the best ratio is 'close to' the |
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1434 // first region w/free space, choose the first region with free space |
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1435 // ("first-free"). The first-free region is usually near the start of the |
0 | 1436 // heap, which means we are copying most of the heap already, so copy a bit |
1437 // more to get complete compaction. | |
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1438 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1439 _maximum_compaction_gc_num = total_invocations(); |
1440 best_cp = full_cp; | |
1441 } | |
1442 #endif // #if 0 | |
1443 | |
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1444 return sd.region_to_addr(best_cp); |
0 | 1445 } |
1446 | |
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1447 #ifndef PRODUCT |
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1448 void |
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1449 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1450 size_t words) |
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1451 { |
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1452 if (TraceParallelOldGCSummaryPhase) { |
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1453 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1454 SIZE_FORMAT, start, start + words, words); |
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1455 } |
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1456 |
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1457 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1458 CollectedHeap::fill_with_objects(start, words); |
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1459 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1460 _mark_bitmap.mark_obj(p, words); |
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1461 _summary_data.add_obj(p, words); |
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1462 start_array->allocate_block(p); |
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1463 } |
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1464 } |
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1465 |
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1466 void |
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1467 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1468 { |
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1469 ParallelCompactData& sd = summary_data(); |
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1470 MutableSpace* space = _space_info[id].space(); |
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1471 |
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1472 // Find the source and destination start addresses. |
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1473 HeapWord* const src_addr = sd.region_align_down(start); |
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1474 HeapWord* dst_addr; |
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1475 if (src_addr < start) { |
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1476 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1477 } else if (src_addr > space->bottom()) { |
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1478 // The start (the original top() value) is aligned to a region boundary so |
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1479 // the associated region does not have a destination. Compute the |
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1480 // destination from the previous region. |
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1481 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1482 dst_addr = cp->destination() + cp->data_size(); |
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1483 } else { |
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1484 // Filling the entire space. |
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1485 dst_addr = space->bottom(); |
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1486 } |
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1487 assert(dst_addr != NULL, "sanity"); |
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1488 |
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1489 // Update the summary data. |
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1490 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1491 src_addr, space->top(), NULL, |
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1492 dst_addr, space->end(), |
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1493 _space_info[id].new_top_addr()); |
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1494 assert(result, "should not fail: bad filler object size"); |
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1495 } |
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1496 |
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1497 void |
496
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1498 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1499 { |
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1500 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1501 return; |
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1502 } |
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1503 |
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1504 MutableSpace* const space = _space_info[id].space(); |
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1505 if (space->is_empty()) { |
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1506 HeapWord* b = space->bottom(); |
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1507 HeapWord* t = b + space->capacity_in_words() / 2; |
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1508 space->set_top(t); |
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1509 if (ZapUnusedHeapArea) { |
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1510 space->set_top_for_allocations(); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1511 } |
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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
|
1512 |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
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parents:
1489
diff
changeset
|
1513 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
|
1514 size_t obj_len = min_size; |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
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diff
changeset
|
1515 while (b + obj_len <= t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1516 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
|
1517 mark_bitmap()->mark_obj(b, obj_len); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1518 summary_data().add_obj(b, obj_len); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1519 b += obj_len; |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
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parents:
1489
diff
changeset
|
1520 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
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parents:
495
diff
changeset
|
1521 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1522 if (b < t) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
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diff
changeset
|
1523 // The loop didn't completely fill to t (top); adjust top downward. |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1524 space->set_top(b); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1525 if (ZapUnusedHeapArea) { |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
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diff
changeset
|
1526 space->set_top_for_allocations(); |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1527 } |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1528 } |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1529 |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1530 HeapWord** nta = _space_info[id].new_top_addr(); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1531 bool result = summary_data().summarize(_space_info[id].split_info(), |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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495
diff
changeset
|
1532 space->bottom(), space->top(), NULL, |
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1533 space->bottom(), space->end(), nta); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1534 assert(result, "space must fit into itself"); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1535 } |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1536 } |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1537 |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1538 void |
483
0f773163217d
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482
diff
changeset
|
1539 PSParallelCompact::provoke_split(bool & max_compaction) |
0f773163217d
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diff
changeset
|
1540 { |
496
b27c885f75f9
6786188: par compact - "SplitALot" stress mode should fill to_space
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parents:
495
diff
changeset
|
1541 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
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diff
changeset
|
1542 return; |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1543 } |
b27c885f75f9
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495
diff
changeset
|
1544 |
483
0f773163217d
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changeset
|
1545 const size_t region_size = ParallelCompactData::RegionSize; |
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diff
changeset
|
1546 ParallelCompactData& sd = summary_data(); |
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482
diff
changeset
|
1547 |
0f773163217d
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diff
changeset
|
1548 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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changeset
|
1549 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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|
1550 const size_t eden_live = pointer_delta(eden_space->top(), |
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changeset
|
1551 _space_info[eden_space_id].new_top()); |
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diff
changeset
|
1552 const size_t from_live = pointer_delta(from_space->top(), |
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482
diff
changeset
|
1553 _space_info[from_space_id].new_top()); |
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diff
changeset
|
1554 |
0f773163217d
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482
diff
changeset
|
1555 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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diff
changeset
|
1556 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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diff
changeset
|
1557 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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parents:
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diff
changeset
|
1558 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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changeset
|
1559 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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diff
changeset
|
1560 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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482
diff
changeset
|
1561 // Choose the space to split; need at least 2 regions live (or fillable). |
0f773163217d
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482
diff
changeset
|
1562 SpaceId id; |
0f773163217d
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parents:
482
diff
changeset
|
1563 MutableSpace* space; |
0f773163217d
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482
diff
changeset
|
1564 size_t live_words; |
0f773163217d
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parents:
482
diff
changeset
|
1565 size_t fill_words; |
0f773163217d
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parents:
482
diff
changeset
|
1566 if (eden_live + eden_fillable >= region_size * 2) { |
0f773163217d
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parents:
482
diff
changeset
|
1567 id = eden_space_id; |
0f773163217d
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parents:
482
diff
changeset
|
1568 space = eden_space; |
0f773163217d
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parents:
482
diff
changeset
|
1569 live_words = eden_live; |
0f773163217d
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parents:
482
diff
changeset
|
1570 fill_words = eden_fillable; |
0f773163217d
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parents:
482
diff
changeset
|
1571 } else if (from_live + from_fillable >= region_size * 2) { |
0f773163217d
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parents:
482
diff
changeset
|
1572 id = from_space_id; |
0f773163217d
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parents:
482
diff
changeset
|
1573 space = from_space; |
0f773163217d
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parents:
482
diff
changeset
|
1574 live_words = from_live; |
0f773163217d
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parents:
482
diff
changeset
|
1575 fill_words = from_fillable; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1576 } else { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1577 return; // Give up. |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1578 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1579 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
|
1580 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1581 if (live_words < region_size * 2) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1582 // 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
|
1583 HeapWord* const fill_start = space->top(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1584 live_words += fill_words; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1585 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1586 space->set_top(fill_start + fill_words); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1587 if (ZapUnusedHeapArea) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1588 space->set_top_for_allocations(); |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1589 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1590 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1591 HeapWord* cur_addr = fill_start; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1592 while (fill_words > 0) { |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1593 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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482
diff
changeset
|
1594 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
0f773163217d
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482
diff
changeset
|
1595 if (fill_words - cur_size < min_fill_size) { |
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6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1596 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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6765954: par compact - stress mode for splitting young gen spaces
jcoomes
parents:
482
diff
changeset
|
1597 } |
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 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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6765954: par compact - stress mode for splitting young gen spaces
jcoomes
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482
diff
changeset
|
1600 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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jcoomes
parents:
482
diff
changeset
|
1601 sd.add_obj(cur_addr, cur_size); |
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6765954: par compact - stress mode for splitting young gen spaces
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482
diff
changeset
|
1602 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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482
diff
changeset
|
1603 cur_addr += cur_size; |
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parents:
482
diff
changeset
|
1604 fill_words -= cur_size; |
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parents:
482
diff
changeset
|
1605 } |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1606 |
0f773163217d
6765954: par compact - stress mode for splitting young gen spaces
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482
diff
changeset
|
1607 summarize_new_objects(id, fill_start); |
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6765954: par compact - stress mode for splitting young gen spaces
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parents:
482
diff
changeset
|
1608 } |
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parents:
482
diff
changeset
|
1609 |
0f773163217d
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482
diff
changeset
|
1610 max_compaction = false; |
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482
diff
changeset
|
1611 |
0f773163217d
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diff
changeset
|
1612 // Manipulate the old gen so that it has room for about half of the live data |
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diff
changeset
|
1613 // in the target young gen space (live_words / 2). |
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482
diff
changeset
|
1614 id = old_space_id; |
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482
diff
changeset
|
1615 space = _space_info[id].space(); |
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482
diff
changeset
|
1616 const size_t free_at_end = space->free_in_words(); |
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changeset
|
1617 const size_t free_target = align_object_size(live_words / 2); |
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changeset
|
1618 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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482
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changeset
|
1619 |
0f773163217d
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482
diff
changeset
|
1620 if (free_at_end >= free_target + min_fill_size) { |
0f773163217d
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482
diff
changeset
|
1621 // Fill space above top() and set the dense prefix so everything survives. |
0f773163217d
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changeset
|
1622 HeapWord* const fill_start = space->top(); |
0f773163217d
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changeset
|
1623 const size_t fill_size = free_at_end - free_target; |
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482
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changeset
|
1624 space->set_top(space->top() + fill_size); |
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482
diff
changeset
|
1625 if (ZapUnusedHeapArea) { |
0f773163217d
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482
diff
changeset
|
1626 space->set_top_for_allocations(); |
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diff
changeset
|
1627 } |
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482
diff
changeset
|
1628 fill_with_live_objects(id, fill_start, fill_size); |
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482
diff
changeset
|
1629 summarize_new_objects(id, fill_start); |
0f773163217d
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482
diff
changeset
|
1630 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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482
diff
changeset
|
1631 } else if (dead + free_at_end > free_target) { |
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482
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changeset
|
1632 // Find a dense prefix that makes the right amount of space available. |
0f773163217d
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482
diff
changeset
|
1633 HeapWord* cur = sd.region_align_down(space->top()); |
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482
diff
changeset
|
1634 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
0f773163217d
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482
diff
changeset
|
1635 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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482
diff
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|
1636 while (dead_to_right < free_target) { |
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1637 cur -= region_size; |
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1638 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1639 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1640 } |
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1641 _space_info[id].set_dense_prefix(cur); |
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1642 } |
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1643 } |
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1644 #endif // #ifndef PRODUCT |
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1645 |
0 | 1646 void PSParallelCompact::summarize_spaces_quick() |
1647 { | |
1648 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1649 const MutableSpace* space = _space_info[i].space(); | |
482
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1650 HeapWord** nta = _space_info[i].new_top_addr(); |
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1651 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1652 space->bottom(), space->top(), NULL, |
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1653 space->bottom(), space->end(), nta); |
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1654 assert(result, "space must fit into itself"); |
0 | 1655 _space_info[i].set_dense_prefix(space->bottom()); |
1656 } | |
496
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1657 |
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1658 #ifndef PRODUCT |
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1659 if (ParallelOldGCSplitALot) { |
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1660 provoke_split_fill_survivor(to_space_id); |
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1661 } |
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1662 #endif // #ifndef PRODUCT |
0 | 1663 } |
1664 | |
1665 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1666 { | |
1667 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1668 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1669 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
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1670 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1671 // Only enough dead space is filled so that any remaining dead space to the |
1672 // left is larger than the minimum filler object. (The remainder is filled | |
1673 // during the copy/update phase.) | |
1674 // | |
1675 // The size of the dead space to the right of the boundary is not a | |
1676 // concern, since compaction will be able to use whatever space is | |
1677 // available. | |
1678 // | |
1679 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1680 // surrounds the space to be filled with an object. | |
1681 // | |
1682 // In the 32-bit VM, each bit represents two 32-bit words: | |
1683 // +---+ | |
1684 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1685 // end_bits: ... x x x | 0 | || 0 x x ... | |
1686 // +---+ | |
1687 // | |
1688 // In the 64-bit VM, each bit represents one 64-bit word: | |
1689 // +------------+ | |
1690 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1691 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1692 // +------------+ | |
1693 // +-------+ | |
1694 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1695 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1696 // +-------+ | |
1697 // +-----------+ | |
1698 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1699 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1700 // +-----------+ | |
1701 // +-------+ | |
1702 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1703 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1704 // +-------+ | |
1705 | |
1706 // Initially assume case a, c or e will apply. | |
1571
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1707 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1708 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1709 | |
1710 #ifdef _LP64 | |
1571
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1711 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1712 // Cases a, c or e. |
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1713 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1714 // Case b above. |
1715 obj_beg = dense_prefix_end - 1; | |
1716 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1717 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1718 // Case d above. | |
1719 obj_beg = dense_prefix_end - 3; | |
1720 obj_len = 3; | |
1721 } | |
1722 #endif // #ifdef _LP64 | |
1723 | |
482
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1724 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1725 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1726 _summary_data.add_obj(obj_beg, obj_len); | |
1727 assert(start_array(id) != NULL, "sanity"); | |
1728 start_array(id)->allocate_block(obj_beg); | |
1729 } | |
1730 } | |
1731 | |
1732 void | |
482
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1733 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1734 { |
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1735 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1736 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1737 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1738 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1739 cur->set_source_region(0); |
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1740 } |
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1741 } |
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1742 |
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1743 void |
0 | 1744 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1745 { | |
1746 assert(id < last_space_id, "id out of range"); | |
483
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1747 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1748 ParallelOldGCSplitALot && id == old_space_id, |
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1749 "should have been reset in summarize_spaces_quick()"); |
0 | 1750 |
1751 const MutableSpace* space = _space_info[id].space(); | |
265
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1752 if (_space_info[id].new_top() != space->bottom()) { |
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1753 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1754 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1755 |
1756 #ifndef PRODUCT | |
265
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1757 if (TraceParallelOldGCDensePrefix) { |
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1758 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1759 dense_prefix_end); |
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1760 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1761 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1762 } |
0 | 1763 #endif // #ifndef PRODUCT |
1764 | |
483
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1765 // Recompute the summary data, taking into account the dense prefix. If |
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1766 // every last byte will be reclaimed, then the existing summary data which |
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1767 // compacts everything can be left in place. |
265
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1768 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1769 // If dead space crosses the dense prefix boundary, it is (at least |
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1770 // partially) filled with a dummy object, marked live and added to the |
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1771 // summary data. This simplifies the copy/update phase and must be done |
483
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1772 // before the final locations of objects are determined, to prevent |
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1773 // leaving a fragment of dead space that is too small to fill. |
265
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1774 fill_dense_prefix_end(id); |
482
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1775 |
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1776 // Compute the destination of each Region, and thus each object. |
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1777 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1778 _summary_data.summarize(_space_info[id].split_info(), |
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1779 dense_prefix_end, space->top(), NULL, |
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1780 dense_prefix_end, space->end(), |
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1781 _space_info[id].new_top_addr()); |
265
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1782 } |
0 | 1783 } |
1784 | |
1785 if (TraceParallelOldGCSummaryPhase) { | |
375
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1786 const size_t region_size = ParallelCompactData::RegionSize; |
265
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1787 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
375
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1788 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1789 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1790 HeapWord* const new_top = _space_info[id].new_top(); |
375
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1791 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1792 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1793 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
375
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1794 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1795 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1796 id, space->capacity_in_words(), dense_prefix_end, | |
375
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1797 dp_region, dp_words / region_size, |
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1798 cr_words / region_size, new_top); |
0 | 1799 } |
1800 } | |
1801 | |
482
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1802 #ifndef PRODUCT |
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1803 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1804 HeapWord* dst_beg, HeapWord* dst_end, |
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1805 SpaceId src_space_id, |
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1806 HeapWord* src_beg, HeapWord* src_end) |
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1807 { |
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1808 if (TraceParallelOldGCSummaryPhase) { |
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1809 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1810 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1811 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1812 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1813 SIZE_FORMAT "-" SIZE_FORMAT, |
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1814 src_space_id, space_names[src_space_id], |
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1815 dst_space_id, space_names[dst_space_id], |
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1816 src_beg, src_end, |
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1817 _summary_data.addr_to_region_idx(src_beg), |
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1818 _summary_data.addr_to_region_idx(src_end), |
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1819 dst_beg, dst_end, |
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1820 _summary_data.addr_to_region_idx(dst_beg), |
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1821 _summary_data.addr_to_region_idx(dst_end)); |
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1822 } |
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1823 } |
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1824 #endif // #ifndef PRODUCT |
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1825 |
0 | 1826 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1827 bool maximum_compaction) | |
1828 { | |
1829 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1830 // trace("2"); | |
1831 | |
1832 #ifdef ASSERT | |
1833 if (TraceParallelOldGCMarkingPhase) { | |
1834 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1835 "add_obj_bytes=" SIZE_FORMAT, | |
1836 add_obj_count, add_obj_size * HeapWordSize); | |
1837 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1838 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1839 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1840 } | |
1841 #endif // #ifdef ASSERT | |
1842 | |
1843 // Quick summarization of each space into itself, to see how much is live. | |
1844 summarize_spaces_quick(); | |
1845 | |
1846 if (TraceParallelOldGCSummaryPhase) { | |
1847 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1848 Universe::print(); | |
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1849 NOT_PRODUCT(print_region_ranges()); |
0 | 1850 if (Verbose) { |
1851 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1852 } | |
1853 } | |
1854 | |
1855 // The amount of live data that will end up in old space (assuming it fits). | |
1856 size_t old_space_total_live = 0; | |
482
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1857 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1858 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1859 _space_info[id].space()->bottom()); | |
1860 } | |
1861 | |
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1862 MutableSpace* const old_space = _space_info[old_space_id].space(); |
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1863 const size_t old_capacity = old_space->capacity_in_words(); |
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1864 if (old_space_total_live > old_capacity) { |
0 | 1865 // XXX - should also try to expand |
1866 maximum_compaction = true; | |
1867 } | |
483
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1868 #ifndef PRODUCT |
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1869 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1870 provoke_split(maximum_compaction); |
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1871 } |
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1872 #endif // #ifndef PRODUCT |
0 | 1873 |
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1874 // Old generations. |
0 | 1875 summarize_space(old_space_id, maximum_compaction); |
1876 | |
482
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1877 // Summarize the remaining spaces in the young gen. The initial target space |
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1878 // is the old gen. If a space does not fit entirely into the target, then the |
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1879 // remainder is compacted into the space itself and that space becomes the new |
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1880 // target. |
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1881 SpaceId dst_space_id = old_space_id; |
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1882 HeapWord* dst_space_end = old_space->end(); |
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1883 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1884 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1885 const MutableSpace* space = _space_info[id].space(); |
1886 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1887 space->bottom()); | |
482
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1888 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1889 |
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1890 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1891 SpaceId(id), space->bottom(), space->top());) |
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1892 if (live > 0 && live <= available) { |
0 | 1893 // All the live data will fit. |
482
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1894 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1895 space->bottom(), space->top(), |
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1896 NULL, |
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1897 *new_top_addr, dst_space_end, |
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1898 new_top_addr); |
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1899 assert(done, "space must fit into old gen"); |
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1900 |
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1901 // Reset the new_top value for the space. |
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1902 _space_info[id].set_new_top(space->bottom()); |
482
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1903 } else if (live > 0) { |
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1904 // Attempt to fit part of the source space into the target space. |
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1905 HeapWord* next_src_addr = NULL; |
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1906 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1907 space->bottom(), space->top(), |
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1908 &next_src_addr, |
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1909 *new_top_addr, dst_space_end, |
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1910 new_top_addr); |
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1911 assert(!done, "space should not fit into old gen"); |
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1912 assert(next_src_addr != NULL, "sanity"); |
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1913 |
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1914 // The source space becomes the new target, so the remainder is compacted |
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1915 // within the space itself. |
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1916 dst_space_id = SpaceId(id); |
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1917 dst_space_end = space->end(); |
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1918 new_top_addr = _space_info[id].new_top_addr(); |
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1919 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1920 space->bottom(), dst_space_end, |
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1921 SpaceId(id), next_src_addr, space->top());) |
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1922 done = _summary_data.summarize(_space_info[id].split_info(), |
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1923 next_src_addr, space->top(), |
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1924 NULL, |
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1925 space->bottom(), dst_space_end, |
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1926 new_top_addr); |
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1927 assert(done, "space must fit when compacted into itself"); |
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1928 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1929 } |
1930 } | |
1931 | |
1932 if (TraceParallelOldGCSummaryPhase) { | |
1933 tty->print_cr("summary_phase: after final summarization"); | |
1934 Universe::print(); | |
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1935 NOT_PRODUCT(print_region_ranges()); |
0 | 1936 if (Verbose) { |
1937 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1938 } | |
1939 } | |
1940 } | |
1941 | |
1942 // This method should contain all heap-specific policy for invoking a full | |
1943 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1944 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1945 // before full gc, or any other specialized behavior, it needs to be added here. | |
1946 // | |
1947 // Note that this method should only be called from the vm_thread while at a | |
1948 // safepoint. | |
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1949 // |
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1950 // Note that the all_soft_refs_clear flag in the collector policy |
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1951 // may be true because this method can be called without intervening |
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1952 // activity. For example when the heap space is tight and full measure |
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1953 // are being taken to free space. |
0 | 1954 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1955 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1956 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1957 "should be in vm thread"); | |
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1958 |
0 | 1959 ParallelScavengeHeap* heap = gc_heap(); |
1960 GCCause::Cause gc_cause = heap->gc_cause(); | |
1961 assert(!heap->is_gc_active(), "not reentrant"); | |
1962 | |
1963 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1964 IsGCActiveMark mark; |
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1965 |
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1966 if (ScavengeBeforeFullGC) { |
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1967 PSScavenge::invoke_no_policy(); |
0 | 1968 } |
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1969 |
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1970 const bool clear_all_soft_refs = |
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1971 heap->collector_policy()->should_clear_all_soft_refs(); |
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1972 |
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1973 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1974 maximum_heap_compaction); |
0 | 1975 } |
1976 | |
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1977 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1978 size_t addr_region_index = addr_to_region_idx(addr); |
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1979 return region_index == addr_region_index; |
0 | 1980 } |
1981 | |
1982 // This method contains no policy. You should probably | |
1983 // be calling invoke() instead. | |
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1984 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 1985 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
1986 assert(ref_processor() != NULL, "Sanity"); | |
1987 | |
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1988 if (GC_locker::check_active_before_gc()) { |
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1989 return false; |
0 | 1990 } |
1991 | |
1992 TimeStamp marking_start; | |
1993 TimeStamp compaction_start; | |
1994 TimeStamp collection_exit; | |
1995 | |
1996 ParallelScavengeHeap* heap = gc_heap(); | |
1997 GCCause::Cause gc_cause = heap->gc_cause(); | |
1998 PSYoungGen* young_gen = heap->young_gen(); | |
1999 PSOldGen* old_gen = heap->old_gen(); | |
2000 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
2001 | |
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2002 // The scope of casr should end after code that can change |
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2003 // CollectorPolicy::_should_clear_all_soft_refs. |
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2004 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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2005 heap->collector_policy()); |
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2006 |
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2007 if (ZapUnusedHeapArea) { |
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2008 // Save information needed to minimize mangling |
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2009 heap->record_gen_tops_before_GC(); |
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2010 } |
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2011 |
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2012 heap->pre_full_gc_dump(); |
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2013 |
0 | 2014 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2015 | |
2016 // Make sure data structures are sane, make the heap parsable, and do other | |
2017 // miscellaneous bookkeeping. | |
2018 PreGCValues pre_gc_values; | |
2019 pre_compact(&pre_gc_values); | |
2020 | |
210 | 2021 // Get the compaction manager reserved for the VM thread. |
2022 ParCompactionManager* const vmthread_cm = | |
2023 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2024 | |
0 | 2025 // Place after pre_compact() where the number of invocations is incremented. |
2026 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2027 | |
2028 { | |
2029 ResourceMark rm; | |
2030 HandleMark hm; | |
2031 | |
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2032 // Set the number of GC threads to be used in this collection |
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2033 gc_task_manager()->set_active_gang(); |
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2034 gc_task_manager()->task_idle_workers(); |
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2035 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2036 |
0 | 2037 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2038 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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2039 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 2040 TraceCollectorStats tcs(counters()); |
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2041 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2042 |
2043 if (TraceGen1Time) accumulated_time()->start(); | |
2044 | |
2045 // Let the size policy know we're starting | |
2046 size_policy->major_collection_begin(); | |
2047 | |
2048 CodeCache::gc_prologue(); | |
2049 Threads::gc_prologue(); | |
2050 | |
2051 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2052 | |
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2053 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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2054 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2055 |
2056 bool marked_for_unloading = false; | |
2057 | |
2058 marking_start.update(); | |
210 | 2059 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2060 |
2061 #ifndef PRODUCT | |
2062 if (TraceParallelOldGCMarkingPhase) { | |
2063 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
2064 "cas_by_another %d", | |
2065 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
2066 mark_bitmap()->cas_by_another()); | |
2067 } | |
2068 #endif // #ifndef PRODUCT | |
2069 | |
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2070 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2071 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2072 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2073 |
2074 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2075 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2076 | |
2077 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2078 // needed by the compaction for filling holes in the dense prefix. | |
2079 adjust_roots(); | |
2080 | |
2081 compaction_start.update(); | |
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2082 compact(); |
0 | 2083 |
2084 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2085 // done before resizing. | |
2086 post_compact(); | |
2087 | |
2088 // Let the size policy know we're done | |
2089 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2090 | |
2091 if (UseAdaptiveSizePolicy) { | |
2092 if (PrintAdaptiveSizePolicy) { | |
2093 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2094 gclog_or_tty->stamp(); | |
2095 gclog_or_tty->print_cr(" collection: %d ", | |
2096 heap->total_collections()); | |
2097 if (Verbose) { | |
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2098 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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2099 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 2100 } |
2101 } | |
2102 | |
2103 // Don't check if the size_policy is ready here. Let | |
2104 // the size_policy check that internally. | |
2105 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2106 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2107 UseAdaptiveSizePolicyWithSystemGC)) { | |
2108 // Calculate optimal free space amounts | |
2109 assert(young_gen->max_size() > | |
2110 young_gen->from_space()->capacity_in_bytes() + | |
2111 young_gen->to_space()->capacity_in_bytes(), | |
2112 "Sizes of space in young gen are out-of-bounds"); | |
2113 size_t max_eden_size = young_gen->max_size() - | |
2114 young_gen->from_space()->capacity_in_bytes() - | |
2115 young_gen->to_space()->capacity_in_bytes(); | |
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2116 size_policy->compute_generation_free_space( |
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2117 young_gen->used_in_bytes(), |
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2118 young_gen->eden_space()->used_in_bytes(), |
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2119 old_gen->used_in_bytes(), |
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2120 young_gen->eden_space()->capacity_in_bytes(), |
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2121 old_gen->max_gen_size(), |
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2122 max_eden_size, |
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2123 true /* full gc*/, |
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2124 gc_cause, |
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2125 heap->collector_policy()); |
263
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2126 |
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2127 heap->resize_old_gen( |
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2128 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2129 |
2130 // Don't resize the young generation at an major collection. A | |
2131 // desired young generation size may have been calculated but | |
2132 // resizing the young generation complicates the code because the | |
2133 // resizing of the old generation may have moved the boundary | |
2134 // between the young generation and the old generation. Let the | |
2135 // young generation resizing happen at the minor collections. | |
2136 } | |
2137 if (PrintAdaptiveSizePolicy) { | |
2138 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2139 heap->total_collections()); | |
2140 } | |
2141 } | |
2142 | |
2143 if (UsePerfData) { | |
2144 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2145 counters->update_counters(); | |
2146 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2147 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2148 } | |
2149 | |
2150 heap->resize_all_tlabs(); | |
2151 | |
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2152 // Resize the metaspace capactiy after a collection |
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2153 MetaspaceGC::compute_new_size(); |
0 | 2154 |
2155 if (TraceGen1Time) accumulated_time()->stop(); | |
2156 | |
2157 if (PrintGC) { | |
2158 if (PrintGCDetails) { | |
2159 // No GC timestamp here. This is after GC so it would be confusing. | |
2160 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2161 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2162 heap->print_heap_change(pre_gc_values.heap_used()); | |
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2163 MetaspaceAux::print_metaspace_change(pre_gc_values.metadata_used()); |
0 | 2164 } else { |
2165 heap->print_heap_change(pre_gc_values.heap_used()); | |
2166 } | |
2167 } | |
2168 | |
2169 // Track memory usage and detect low memory | |
2170 MemoryService::track_memory_usage(); | |
2171 heap->update_counters(); | |
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2172 gc_task_manager()->release_idle_workers(); |
0 | 2173 } |
2174 | |
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2175 #ifdef ASSERT |
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2176 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2177 ParCompactionManager* const cm = |
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2178 ParCompactionManager::manager_array(int(i)); |
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2179 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2180 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
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2181 } |
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2182 #endif // ASSERT |
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2183 |
0 | 2184 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2185 HandleMark hm; // Discard invalid handles created during verification | |
2186 gclog_or_tty->print(" VerifyAfterGC:"); | |
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2187 Universe::verify(); |
0 | 2188 } |
2189 | |
2190 // Re-verify object start arrays | |
2191 if (VerifyObjectStartArray && | |
2192 VerifyAfterGC) { | |
2193 old_gen->verify_object_start_array(); | |
2194 } | |
2195 | |
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2196 if (ZapUnusedHeapArea) { |
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2197 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2198 } |
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2199 |
0 | 2200 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2201 | |
2202 collection_exit.update(); | |
2203 | |
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2204 heap->print_heap_after_gc(); |
0 | 2205 if (PrintGCTaskTimeStamps) { |
2206 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2207 INT64_FORMAT, | |
2208 marking_start.ticks(), compaction_start.ticks(), | |
2209 collection_exit.ticks()); | |
2210 gc_task_manager()->print_task_time_stamps(); | |
2211 } | |
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2212 |
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2213 heap->post_full_gc_dump(); |
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2214 |
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2215 #ifdef TRACESPINNING |
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2216 ParallelTaskTerminator::print_termination_counts(); |
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2217 #endif |
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2218 |
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2219 return true; |
0 | 2220 } |
2221 | |
2222 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2223 PSYoungGen* young_gen, | |
2224 PSOldGen* old_gen) { | |
2225 MutableSpace* const eden_space = young_gen->eden_space(); | |
2226 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2227 assert(young_gen->virtual_space()->alignment() == | |
2228 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2229 | |
2230 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2231 return false; | |
2232 } | |
2233 | |
2234 // Both generations must be completely committed. | |
2235 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2236 return false; | |
2237 } | |
2238 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2239 return false; | |
2240 } | |
2241 | |
2242 // Figure out how much to take from eden. Include the average amount promoted | |
2243 // in the total; otherwise the next young gen GC will simply bail out to a | |
2244 // full GC. | |
2245 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2246 const size_t eden_used = eden_space->used_in_bytes(); | |
2247 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2248 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2249 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2250 | |
2251 if (absorb_size >= eden_capacity) { | |
2252 return false; // Must leave some space in eden. | |
2253 } | |
2254 | |
2255 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2256 if (new_young_size < young_gen->min_gen_size()) { | |
2257 return false; // Respect young gen minimum size. | |
2258 } | |
2259 | |
2260 if (TraceAdaptiveGCBoundary && Verbose) { | |
2261 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2262 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2263 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2264 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2265 absorb_size / K, | |
2266 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2267 young_gen->from_space()->used_in_bytes() / K, | |
2268 young_gen->to_space()->used_in_bytes() / K, | |
2269 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2270 } | |
2271 | |
2272 // Fill the unused part of the old gen. | |
2273 MutableSpace* const old_space = old_gen->object_space(); | |
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2274 HeapWord* const unused_start = old_space->top(); |
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2275 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2276 |
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2277 if (unused_words > 0) { |
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2278 if (unused_words < CollectedHeap::min_fill_size()) { |
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2279 return false; // If the old gen cannot be filled, must give up. |
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2280 } |
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2281 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2282 } |
2283 | |
2284 // Take the live data from eden and set both top and end in the old gen to | |
2285 // eden top. (Need to set end because reset_after_change() mangles the region | |
2286 // from end to virtual_space->high() in debug builds). | |
2287 HeapWord* const new_top = eden_space->top(); | |
2288 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2289 absorb_size); | |
2290 young_gen->reset_after_change(); | |
2291 old_space->set_top(new_top); | |
2292 old_space->set_end(new_top); | |
2293 old_gen->reset_after_change(); | |
2294 | |
2295 // Update the object start array for the filler object and the data from eden. | |
2296 ObjectStartArray* const start_array = old_gen->start_array(); | |
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2297 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2298 start_array->allocate_block(p); |
0 | 2299 } |
2300 | |
2301 // Could update the promoted average here, but it is not typically updated at | |
2302 // full GCs and the value to use is unclear. Something like | |
2303 // | |
2304 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2305 | |
2306 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2307 return true; | |
2308 } | |
2309 | |
2310 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2311 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2312 "shouldn't return NULL"); | |
2313 return ParallelScavengeHeap::gc_task_manager(); | |
2314 } | |
2315 | |
2316 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2317 bool maximum_heap_compaction) { | |
2318 // Recursively traverse all live objects and mark them | |
2319 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2320 | |
2321 ParallelScavengeHeap* heap = gc_heap(); | |
2322 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2323 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2324 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2325 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2326 |
2327 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2328 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2329 | |
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2330 // Need new claim bits before marking starts. |
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2331 ClassLoaderDataGraph::clear_claimed_marks(); |
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2332 |
0 | 2333 { |
2334 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
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2335 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2336 |
2337 GCTaskQueue* q = GCTaskQueue::create(); | |
2338 | |
2339 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2340 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2341 // We scan the thread roots in parallel | |
2342 Threads::create_thread_roots_marking_tasks(q); | |
2343 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2344 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2345 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2346 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2347 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2348 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2349 |
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2350 if (active_gc_threads > 1) { |
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2351 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2352 q->enqueue(new StealMarkingTask(&terminator)); |
2353 } | |
2354 } | |
2355 | |
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2356 gc_task_manager()->execute_and_wait(q); |
0 | 2357 } |
2358 | |
2359 // Process reference objects found during marking | |
2360 { | |
2361 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2362 if (ref_processor()->processing_is_mt()) { | |
2363 RefProcTaskExecutor task_executor; | |
2364 ref_processor()->process_discovered_references( | |
453
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2365 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2366 &task_executor); |
0 | 2367 } else { |
2368 ref_processor()->process_discovered_references( | |
453
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2369 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2370 } |
2371 } | |
2372 | |
2373 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2374 // Follow system dictionary roots and unload classes. | |
2375 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2376 | |
2377 // Follow code cache roots. | |
6787
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2378 CodeCache::do_unloading(is_alive_closure(), purged_class); |
1311
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2379 cm->follow_marking_stacks(); // Flush marking stack. |
0 | 2380 |
2381 // Update subklass/sibling/implementor links of live klasses | |
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2382 Klass::clean_weak_klass_links(is_alive_closure()); |
0 | 2383 |
2177
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2384 // Visit interned string tables and delete unmarked oops |
0 | 2385 StringTable::unlink(is_alive_closure()); |
2177
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2386 // Clean up unreferenced symbols in symbol table. |
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2387 SymbolTable::unlink(); |
0 | 2388 |
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2389 assert(cm->marking_stacks_empty(), "marking stacks should be empty"); |
0 | 2390 } |
2391 | |
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2392 void PSParallelCompact::follow_klass(ParCompactionManager* cm, Klass* klass) { |
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2393 ClassLoaderData* cld = klass->class_loader_data(); |
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2394 // The actual processing of the klass is done when we |
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2395 // traverse the list of Klasses in the class loader data. |
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2396 PSParallelCompact::follow_class_loader(cm, cld); |
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2397 } |
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2398 |
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2399 void PSParallelCompact::adjust_klass(ParCompactionManager* cm, Klass* klass) { |
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2400 ClassLoaderData* cld = klass->class_loader_data(); |
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2401 // The actual processing of the klass is done when we |
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2402 // traverse the list of Klasses in the class loader data. |
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2403 PSParallelCompact::adjust_class_loader(cm, cld); |
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2404 } |
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2405 |
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2406 void PSParallelCompact::follow_class_loader(ParCompactionManager* cm, |
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2407 ClassLoaderData* cld) { |
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2408 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); |
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2409 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); |
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2410 |
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2411 cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true); |
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2412 } |
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2413 |
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2414 void PSParallelCompact::adjust_class_loader(ParCompactionManager* cm, |
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2415 ClassLoaderData* cld) { |
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2416 cld->oops_do(PSParallelCompact::adjust_root_pointer_closure(), |
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2417 PSParallelCompact::adjust_klass_closure(), |
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2418 true); |
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2419 } |
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2420 |
0 | 2421 // This should be moved to the shared markSweep code! |
2422 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2423 public: | |
2424 void do_object(oop p) { ShouldNotReachHere(); } | |
2425 bool do_object_b(oop p) { return true; } | |
2426 }; | |
2427 static PSAlwaysTrueClosure always_true; | |
2428 | |
2429 void PSParallelCompact::adjust_roots() { | |
2430 // Adjust the pointers to reflect the new locations | |
2431 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2432 | |
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2433 // Need new claim bits when tracing through and adjusting pointers. |
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2434 ClassLoaderDataGraph::clear_claimed_marks(); |
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2435 |
0 | 2436 // General strong roots. |
2437 Universe::oops_do(adjust_root_pointer_closure()); | |
2438 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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2439 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 2440 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
2441 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
2442 Management::oops_do(adjust_root_pointer_closure()); | |
2443 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
2444 // SO_AllClasses | |
2445 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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2446 ClassLoaderDataGraph::oops_do(adjust_root_pointer_closure(), adjust_klass_closure(), true); |
0 | 2447 |
2448 // Now adjust pointers in remaining weak roots. (All of which should | |
2449 // have been cleared if they pointed to non-surviving objects.) | |
2450 // Global (weak) JNI handles | |
2451 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
2452 | |
2453 CodeCache::oops_do(adjust_pointer_closure()); | |
2454 StringTable::oops_do(adjust_root_pointer_closure()); | |
2455 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
2456 // Roots were visited so references into the young gen in roots | |
2457 // may have been scanned. Process them also. | |
2458 // Should the reference processor have a span that excludes | |
2459 // young gen objects? | |
2460 PSScavenge::reference_processor()->weak_oops_do( | |
2461 adjust_root_pointer_closure()); | |
2462 } | |
2463 | |
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2464 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2465 uint parallel_gc_threads) |
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2466 { |
0 | 2467 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2468 | |
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2469 // Find the threads that are active |
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2470 unsigned int which = 0; |
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2471 |
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2472 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2473 for (uint j = 0; j < task_count; j++) { |
1833
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2474 q->enqueue(new DrainStacksCompactionTask(j)); |
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2475 ParCompactionManager::verify_region_list_empty(j); |
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2476 // Set the region stacks variables to "no" region stack values |
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2477 // so that they will be recognized and needing a region stack |
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2478 // in the stealing tasks if they do not get one by executing |
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2479 // a draining stack. |
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2480 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2481 cm->set_region_stack(NULL); |
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2482 cm->set_region_stack_index((uint)max_uintx); |
0 | 2483 } |
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2484 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2485 |
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2486 // Find all regions that are available (can be filled immediately) and |
0 | 2487 // distribute them to the thread stacks. The iteration is done in reverse |
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2488 // order (high to low) so the regions will be removed in ascending order. |
0 | 2489 |
2490 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2491 | |
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2492 size_t fillable_regions = 0; // A count for diagnostic purposes. |
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2493 // A region index which corresponds to the tasks created above. |
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2494 // "which" must be 0 <= which < task_count |
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2495 |
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2496 which = 0; |
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2497 // id + 1 is used to test termination so unsigned can |
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2498 // be used with an old_space_id == 0. |
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2499 for (unsigned int id = to_space_id; id + 1 > old_space_id; --id) { |
0 | 2500 SpaceInfo* const space_info = _space_info + id; |
2501 MutableSpace* const space = space_info->space(); | |
2502 HeapWord* const new_top = space_info->new_top(); | |
2503 | |
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2504 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2505 const size_t end_region = |
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2506 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2507 |
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2508 for (size_t cur = end_region - 1; cur + 1 > beg_region; --cur) { |
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2509 if (sd.region(cur)->claim_unsafe()) { |
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2510 ParCompactionManager::region_list_push(which, cur); |
0 | 2511 |
2512 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2513 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2514 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
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2515 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2516 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2517 } | |
2518 | |
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2519 NOT_PRODUCT(++fillable_regions;) |
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2520 |
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2521 // Assign regions to tasks in round-robin fashion. |
0 | 2522 if (++which == task_count) { |
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2523 assert(which <= parallel_gc_threads, |
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2524 "Inconsistent number of workers"); |
0 | 2525 which = 0; |
2526 } | |
2527 } | |
2528 } | |
2529 } | |
2530 | |
2531 if (TraceParallelOldGCCompactionPhase) { | |
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2532 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2533 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2534 } |
2535 } | |
2536 | |
2537 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2538 | |
2539 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2540 uint parallel_gc_threads) { | |
2541 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2542 | |
2543 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2544 | |
2545 // Iterate over all the spaces adding tasks for updating | |
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2546 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2547 // will work on opening the gaps and the remaining gc threads |
2548 // will work on the dense prefix. | |
482
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2549 unsigned int space_id; |
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2550 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2551 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2552 const MutableSpace* const space = _space_info[space_id].space(); | |
2553 | |
2554 if (dense_prefix_end == space->bottom()) { | |
2555 // There is no dense prefix for this space. | |
2556 continue; | |
2557 } | |
2558 | |
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2559 // The dense prefix is before this region. |
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2560 size_t region_index_end_dense_prefix = |
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2561 sd.addr_to_region_idx(dense_prefix_end); |
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2562 RegionData* const dense_prefix_cp = |
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2563 sd.region(region_index_end_dense_prefix); |
0 | 2564 assert(dense_prefix_end == space->end() || |
2565 dense_prefix_cp->available() || | |
2566 dense_prefix_cp->claimed(), | |
375
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2567 "The region after the dense prefix should always be ready to fill"); |
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2568 |
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2569 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2570 |
2571 // Is there dense prefix work? | |
375
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2572 size_t total_dense_prefix_regions = |
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2573 region_index_end_dense_prefix - region_index_start; |
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2574 // How many regions of the dense prefix should be given to |
0 | 2575 // each thread? |
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2576 if (total_dense_prefix_regions > 0) { |
0 | 2577 uint tasks_for_dense_prefix = 1; |
3251
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2578 if (total_dense_prefix_regions <= |
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2579 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2580 // Don't over partition. This assumes that |
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2581 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2582 // so there are not many regions to process. |
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2583 tasks_for_dense_prefix = parallel_gc_threads; |
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2584 } else { |
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2585 // Over partition |
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2586 tasks_for_dense_prefix = parallel_gc_threads * |
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2587 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2588 } |
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2589 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2590 tasks_for_dense_prefix; |
375
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2591 // Give each thread at least 1 region. |
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2592 if (regions_per_thread == 0) { |
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2593 regions_per_thread = 1; |
0 | 2594 } |
2595 | |
2596 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2597 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2598 break; |
2599 } | |
375
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2600 // region_index_end is not processed |
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2601 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2602 region_index_end_dense_prefix); |
482
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2603 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2604 region_index_start, |
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2605 region_index_end)); |
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2606 region_index_start = region_index_end; |
0 | 2607 } |
2608 } | |
2609 // This gets any part of the dense prefix that did not | |
2610 // fit evenly. | |
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2611 if (region_index_start < region_index_end_dense_prefix) { |
482
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2612 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2613 region_index_start, |
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2614 region_index_end_dense_prefix)); |
0 | 2615 } |
482
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2616 } |
0 | 2617 } |
2618 | |
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2619 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2620 GCTaskQueue* q, |
2621 ParallelTaskTerminator* terminator_ptr, | |
2622 uint parallel_gc_threads) { | |
2623 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2624 | |
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2625 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2626 // other threads. |
2627 if (parallel_gc_threads > 1) { | |
2628 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2629 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2630 } |
2631 } | |
2632 } | |
2633 | |
2634 void PSParallelCompact::compact() { | |
2635 // trace("5"); | |
2636 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2637 | |
2638 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2639 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2640 PSOldGen* old_gen = heap->old_gen(); | |
2641 old_gen->start_array()->reset(); | |
2642 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2643 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2644 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2645 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2646 |
2647 GCTaskQueue* q = GCTaskQueue::create(); | |
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2648 enqueue_region_draining_tasks(q, active_gc_threads); |
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2649 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2650 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2651 |
2652 { | |
2653 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2654 | |
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2655 gc_task_manager()->execute_and_wait(q); |
0 | 2656 |
2657 #ifdef ASSERT | |
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2658 // Verify that all regions have been processed before the deferred updates. |
0 | 2659 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2660 verify_complete(SpaceId(id)); | |
2661 } | |
2662 #endif | |
2663 } | |
2664 | |
2665 { | |
2666 // Update the deferred objects, if any. Any compaction manager can be used. | |
2667 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2668 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2669 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2670 update_deferred_objects(cm, SpaceId(id)); | |
2671 } | |
2672 } | |
2673 } | |
2674 | |
2675 #ifdef ASSERT | |
2676 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2677 // All Regions between space bottom() to new_top() should be marked as filled |
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2678 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2679 // should have been emptied). |
2680 ParallelCompactData& sd = summary_data(); | |
2681 SpaceInfo si = _space_info[space_id]; | |
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2682 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2683 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2684 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2685 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2686 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2687 |
2688 bool issued_a_warning = false; | |
2689 | |
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2690 size_t cur_region; |
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2691 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2692 const RegionData* const c = sd.region(cur_region); |
0 | 2693 if (!c->completed()) { |
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2694 warning("region " SIZE_FORMAT " not filled: " |
0 | 2695 "destination_count=" SIZE_FORMAT, |
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2696 cur_region, c->destination_count()); |
0 | 2697 issued_a_warning = true; |
2698 } | |
2699 } | |
2700 | |
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2701 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2702 const RegionData* const c = sd.region(cur_region); |
0 | 2703 if (!c->available()) { |
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2704 warning("region " SIZE_FORMAT " not empty: " |
0 | 2705 "destination_count=" SIZE_FORMAT, |
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2706 cur_region, c->destination_count()); |
0 | 2707 issued_a_warning = true; |
2708 } | |
2709 } | |
2710 | |
2711 if (issued_a_warning) { | |
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2712 print_region_ranges(); |
0 | 2713 } |
2714 } | |
2715 #endif // #ifdef ASSERT | |
2716 | |
941 | 2717 |
0 | 2718 #ifdef VALIDATE_MARK_SWEEP |
2719 | |
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2720 void PSParallelCompact::track_adjusted_pointer(void* p, bool isroot) { |
0 | 2721 if (!ValidateMarkSweep) |
2722 return; | |
2723 | |
2724 if (!isroot) { | |
2725 if (_pointer_tracking) { | |
2726 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
2727 _adjusted_pointers->remove(p); | |
2728 } | |
2729 } else { | |
2730 ptrdiff_t index = _root_refs_stack->find(p); | |
2731 if (index != -1) { | |
2732 int l = _root_refs_stack->length(); | |
2733 if (l > 0 && l - 1 != index) { | |
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2734 void* last = _root_refs_stack->pop(); |
0 | 2735 assert(last != p, "should be different"); |
2736 _root_refs_stack->at_put(index, last); | |
2737 } else { | |
2738 _root_refs_stack->remove(p); | |
2739 } | |
2740 } | |
2741 } | |
2742 } | |
2743 | |
2744 | |
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2745 void PSParallelCompact::check_adjust_pointer(void* p) { |
0 | 2746 _adjusted_pointers->push(p); |
2747 } | |
2748 | |
2749 | |
2750 class AdjusterTracker: public OopClosure { | |
2751 public: | |
2752 AdjusterTracker() {}; | |
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2753 void do_oop(oop* o) { PSParallelCompact::check_adjust_pointer(o); } |
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2754 void do_oop(narrowOop* o) { PSParallelCompact::check_adjust_pointer(o); } |
0 | 2755 }; |
2756 | |
2757 | |
2758 void PSParallelCompact::track_interior_pointers(oop obj) { | |
2759 if (ValidateMarkSweep) { | |
2760 _adjusted_pointers->clear(); | |
2761 _pointer_tracking = true; | |
2762 | |
2763 AdjusterTracker checker; | |
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2764 obj->oop_iterate_no_header(&checker); |
0 | 2765 } |
2766 } | |
2767 | |
2768 | |
2769 void PSParallelCompact::check_interior_pointers() { | |
2770 if (ValidateMarkSweep) { | |
2771 _pointer_tracking = false; | |
2772 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
2773 } | |
2774 } | |
2775 | |
2776 | |
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2777 void PSParallelCompact::reset_live_oop_tracking() { |
0 | 2778 if (ValidateMarkSweep) { |
2779 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
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2780 _live_oops_index = 0; |
0 | 2781 } |
2782 } | |
2783 | |
2784 | |
2785 void PSParallelCompact::register_live_oop(oop p, size_t size) { | |
2786 if (ValidateMarkSweep) { | |
2787 _live_oops->push(p); | |
2788 _live_oops_size->push(size); | |
2789 _live_oops_index++; | |
2790 } | |
2791 } | |
2792 | |
2793 void PSParallelCompact::validate_live_oop(oop p, size_t size) { | |
2794 if (ValidateMarkSweep) { | |
2795 oop obj = _live_oops->at((int)_live_oops_index); | |
2796 guarantee(obj == p, "should be the same object"); | |
2797 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
2798 _live_oops_index++; | |
2799 } | |
2800 } | |
2801 | |
2802 void PSParallelCompact::live_oop_moved_to(HeapWord* q, size_t size, | |
2803 HeapWord* compaction_top) { | |
2804 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
2805 "should be moved to forwarded location"); | |
2806 if (ValidateMarkSweep) { | |
2807 PSParallelCompact::validate_live_oop(oop(q), size); | |
2808 _live_oops_moved_to->push(oop(compaction_top)); | |
2809 } | |
2810 if (RecordMarkSweepCompaction) { | |
2811 _cur_gc_live_oops->push(q); | |
2812 _cur_gc_live_oops_moved_to->push(compaction_top); | |
2813 _cur_gc_live_oops_size->push(size); | |
2814 } | |
2815 } | |
2816 | |
2817 | |
2818 void PSParallelCompact::compaction_complete() { | |
2819 if (RecordMarkSweepCompaction) { | |
2820 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
2821 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
2822 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
2823 | |
2824 _cur_gc_live_oops = _last_gc_live_oops; | |
2825 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
2826 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
2827 _last_gc_live_oops = _tmp_live_oops; | |
2828 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
2829 _last_gc_live_oops_size = _tmp_live_oops_size; | |
2830 } | |
2831 } | |
2832 | |
2833 | |
2834 void PSParallelCompact::print_new_location_of_heap_address(HeapWord* q) { | |
2835 if (!RecordMarkSweepCompaction) { | |
2836 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
2837 return; | |
2838 } | |
2839 | |
2840 if (_last_gc_live_oops == NULL) { | |
2841 tty->print_cr("No compaction information gathered yet"); | |
2842 return; | |
2843 } | |
2844 | |
2845 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
2846 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
2847 size_t sz = _last_gc_live_oops_size->at(i); | |
2848 if (old_oop <= q && q < (old_oop + sz)) { | |
2849 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
2850 size_t offset = (q - old_oop); | |
2851 tty->print_cr("Address " PTR_FORMAT, q); | |
2852 tty->print_cr(" Was in oop " PTR_FORMAT ", size %d, at offset %d", old_oop, sz, offset); | |
2853 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); | |
2854 return; | |
2855 } | |
2856 } | |
2857 | |
2858 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
2859 } | |
2860 #endif //VALIDATE_MARK_SWEEP | |
2861 | |
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2862 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2863 void |
2864 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2865 SpaceId space_id, | |
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2866 size_t beg_region, |
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2867 size_t end_region) { |
0 | 2868 ParallelCompactData& sd = summary_data(); |
2869 ParMarkBitMap* const mbm = mark_bitmap(); | |
2870 | |
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2871 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2872 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2873 assert(beg_region <= end_region, "bad region range"); |
0 | 2874 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2875 | |
2876 #ifdef ASSERT | |
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2877 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2878 // filled. |
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2879 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2880 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2881 } |
2882 #endif // #ifdef ASSERT | |
2883 | |
2884 if (beg_addr != space(space_id)->bottom()) { | |
2885 // Find the first live object or block of dead space that *starts* in this | |
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2886 // range of regions. If a partial object crosses onto the region, skip it; |
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2887 // it will be marked for 'deferred update' when the object head is |
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2888 // processed. If dead space crosses onto the region, it is also skipped; it |
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2889 // will be filled when the prior region is processed. If neither of those |
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2890 // apply, the first word in the region is the start of a live object or dead |
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2891 // space. |
0 | 2892 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2893 const RegionData* const cp = sd.region(beg_region); |
0 | 2894 if (cp->partial_obj_size() != 0) { |
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2895 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2896 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2897 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2898 } | |
2899 } | |
2900 | |
2901 if (beg_addr < end_addr) { | |
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2902 // A live object or block of dead space starts in this range of Regions. |
0 | 2903 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2904 | |
2905 // Create closures and iterate. | |
2906 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2907 FillClosure fill_closure(cm, space_id); | |
2908 ParMarkBitMap::IterationStatus status; | |
2909 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2910 dense_prefix_end); | |
2911 if (status == ParMarkBitMap::incomplete) { | |
2912 update_closure.do_addr(update_closure.source()); | |
2913 } | |
2914 } | |
2915 | |
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2916 // Mark the regions as filled. |
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2917 RegionData* const beg_cp = sd.region(beg_region); |
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2918 RegionData* const end_cp = sd.region(end_region); |
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2919 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2920 cp->set_completed(); |
2921 } | |
2922 } | |
2923 | |
2924 // Return the SpaceId for the space containing addr. If addr is not in the | |
2925 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2926 // in the heap and asserts such. | |
2927 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2928 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2929 | |
6725
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2930 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 2931 if (_space_info[id].space()->contains(addr)) { |
2932 return SpaceId(id); | |
2933 } | |
2934 } | |
2935 | |
2936 assert(false, "no space contains the addr"); | |
2937 return last_space_id; | |
2938 } | |
2939 | |
2940 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2941 SpaceId id) { | |
2942 assert(id < last_space_id, "bad space id"); | |
2943 | |
2944 ParallelCompactData& sd = summary_data(); | |
2945 const SpaceInfo* const space_info = _space_info + id; | |
2946 ObjectStartArray* const start_array = space_info->start_array(); | |
2947 | |
2948 const MutableSpace* const space = space_info->space(); | |
2949 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2950 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2951 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2952 |
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2953 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2954 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2955 const RegionData* cur_region; |
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2956 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2957 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2958 if (addr != NULL) { |
2959 if (start_array != NULL) { | |
2960 start_array->allocate_block(addr); | |
2961 } | |
2962 oop(addr)->update_contents(cm); | |
2963 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2964 } | |
2965 } | |
2966 } | |
2967 | |
2968 // Skip over count live words starting from beg, and return the address of the | |
2969 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2970 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2971 // an object, or account for those live words in some other way. Callers must | |
2972 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2973 HeapWord* | |
2974 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2975 { | |
2976 assert(count > 0, "sanity"); | |
2977 | |
2978 ParMarkBitMap* m = mark_bitmap(); | |
2979 idx_t bits_to_skip = m->words_to_bits(count); | |
2980 idx_t cur_beg = m->addr_to_bit(beg); | |
2981 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2982 | |
2983 do { | |
2984 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2985 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2986 const size_t obj_bits = cur_end - cur_beg + 1; | |
2987 if (obj_bits > bits_to_skip) { | |
2988 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2989 } | |
2990 bits_to_skip -= obj_bits; | |
2991 cur_beg = cur_end + 1; | |
2992 } while (bits_to_skip > 0); | |
2993 | |
2994 // Skipping the desired number of words landed just past the end of an object. | |
2995 // Find the start of the next object. | |
2996 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2997 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2998 return m->bit_to_addr(cur_beg); | |
2999 } | |
3000 | |
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3001 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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3002 SpaceId src_space_id, |
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3003 size_t src_region_idx) |
0 | 3004 { |
482
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3005 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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3006 |
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3007 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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3008 if (split_info.dest_region_addr() == dest_addr) { |
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3009 // The partial object ending at the split point contains the first word to |
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3010 // be copied to dest_addr. |
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3011 return split_info.first_src_addr(); |
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3012 } |
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3013 |
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3014 const ParallelCompactData& sd = summary_data(); |
0 | 3015 ParMarkBitMap* const bitmap = mark_bitmap(); |
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3016 const size_t RegionSize = ParallelCompactData::RegionSize; |
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3017 |
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3018 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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3019 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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3020 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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3021 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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3022 |
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3023 assert(dest_addr >= src_region_destination, "wrong src region"); |
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3024 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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3025 |
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3026 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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3027 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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3028 |
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3029 HeapWord* addr = src_region_beg; |
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3030 if (dest_addr == src_region_destination) { |
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3031 // Return the first live word in the source region. |
0 | 3032 if (partial_obj_size == 0) { |
375
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3033 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3034 assert(addr < src_region_end, "no objects start in src region"); |
0 | 3035 } |
3036 return addr; | |
3037 } | |
3038 | |
3039 // Must skip some live data. | |
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3040 size_t words_to_skip = dest_addr - src_region_destination; |
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3041 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 3042 |
3043 if (partial_obj_size >= words_to_skip) { | |
3044 // All the live words to skip are part of the partial object. | |
3045 addr += words_to_skip; | |
3046 if (partial_obj_size == words_to_skip) { | |
3047 // Find the first live word past the partial object. | |
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3048 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3049 assert(addr < src_region_end, "wrong src region"); |
0 | 3050 } |
3051 return addr; | |
3052 } | |
3053 | |
3054 // Skip over the partial object (if any). | |
3055 if (partial_obj_size != 0) { | |
3056 words_to_skip -= partial_obj_size; | |
3057 addr += partial_obj_size; | |
3058 } | |
3059 | |
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3060 // Skip over live words due to objects that start in the region. |
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3061 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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3062 assert(addr < src_region_end, "wrong src region"); |
0 | 3063 return addr; |
3064 } | |
3065 | |
3066 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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3067 SpaceId src_space_id, |
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3068 size_t beg_region, |
0 | 3069 HeapWord* end_addr) |
3070 { | |
3071 ParallelCompactData& sd = summary_data(); | |
495
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3072 |
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3073 #ifdef ASSERT |
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3074 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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3075 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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3076 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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3077 "src_space_id does not match beg_addr"); |
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3078 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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3079 "src_space_id does not match end_addr"); |
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3080 #endif // #ifdef ASSERT |
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3081 |
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3082 RegionData* const beg = sd.region(beg_region); |
495
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3083 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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3084 |
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3085 // Regions up to new_top() are enqueued if they become available. |
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3086 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3087 RegionData* const enqueue_end = |
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3088 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3089 |
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3090 for (RegionData* cur = beg; cur < end; ++cur) { |
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3091 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3092 cur->decrement_destination_count(); |
495
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3093 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 3094 cm->push_region(sd.region(cur)); |
0 | 3095 } |
3096 } | |
3097 } | |
3098 | |
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3099 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3100 SpaceId& src_space_id, |
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3101 HeapWord*& src_space_top, |
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3102 HeapWord* end_addr) |
0 | 3103 { |
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3104 typedef ParallelCompactData::RegionData RegionData; |
0 | 3105 |
3106 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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3107 const size_t region_size = ParallelCompactData::RegionSize; |
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3108 |
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3109 size_t src_region_idx = 0; |
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3110 |
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3111 // Skip empty regions (if any) up to the top of the space. |
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3112 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3113 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3114 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3115 const RegionData* const top_region_ptr = |
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3116 sd.addr_to_region_ptr(top_aligned_up); |
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3117 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3118 ++src_region_ptr; |
0 | 3119 } |
3120 | |
375
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3121 if (src_region_ptr < top_region_ptr) { |
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3122 // The next source region is in the current space. Update src_region_idx |
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3123 // and the source address to match src_region_ptr. |
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3124 src_region_idx = sd.region(src_region_ptr); |
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3125 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3126 if (src_region_addr > closure.source()) { |
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3127 closure.set_source(src_region_addr); |
0 | 3128 } |
375
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3129 return src_region_idx; |
0 | 3130 } |
3131 | |
375
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3132 // Switch to a new source space and find the first non-empty region. |
0 | 3133 unsigned int space_id = src_space_id + 1; |
3134 assert(space_id < last_space_id, "not enough spaces"); | |
3135 | |
3136 HeapWord* const destination = closure.destination(); | |
3137 | |
3138 do { | |
3139 MutableSpace* space = _space_info[space_id].space(); | |
3140 HeapWord* const bottom = space->bottom(); | |
375
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3141 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3142 |
3143 // Iterate over the spaces that do not compact into themselves. | |
3144 if (bottom_cp->destination() != bottom) { | |
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3145 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3146 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3147 |
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3148 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3149 if (src_cp->live_obj_size() > 0) { |
3150 // Found it. | |
3151 assert(src_cp->destination() == destination, | |
3152 "first live obj in the space must match the destination"); | |
3153 assert(src_cp->partial_obj_size() == 0, | |
3154 "a space cannot begin with a partial obj"); | |
3155 | |
3156 src_space_id = SpaceId(space_id); | |
3157 src_space_top = space->top(); | |
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3158 const size_t src_region_idx = sd.region(src_cp); |
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3159 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3160 return src_region_idx; |
0 | 3161 } else { |
3162 assert(src_cp->data_size() == 0, "sanity"); | |
3163 } | |
3164 } | |
3165 } | |
3166 } while (++space_id < last_space_id); | |
3167 | |
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3168 assert(false, "no source region was found"); |
0 | 3169 return 0; |
3170 } | |
3171 | |
375
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3172 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3173 { |
3174 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
375
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3175 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3176 ParMarkBitMap* const bitmap = mark_bitmap(); |
3177 ParallelCompactData& sd = summary_data(); | |
375
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3178 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3179 |
3180 // Get the items needed to construct the closure. | |
375
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3181 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3182 SpaceId dest_space_id = space_id(dest_addr); |
3183 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3184 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3185 assert(dest_addr < new_top, "sanity"); | |
375
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3186 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3187 |
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3188 // Get the source region and related info. |
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3189 size_t src_region_idx = region_ptr->source_region(); |
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3190 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3191 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3192 | |
3193 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3194 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
375
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3195 |
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3196 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3197 // destination count is not decremented when a region is copied to itself). |
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3198 if (src_region_idx == region_idx) { |
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3199 src_region_idx += 1; |
0 | 3200 } |
3201 | |
3202 if (bitmap->is_unmarked(closure.source())) { | |
3203 // The first source word is in the middle of an object; copy the remainder | |
3204 // of the object or as much as will fit. The fact that pointer updates were | |
3205 // deferred will be noted when the object header is processed. | |
3206 HeapWord* const old_src_addr = closure.source(); | |
3207 closure.copy_partial_obj(); | |
3208 if (closure.is_full()) { | |
495
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3209 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3210 closure.source()); |
375
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3211 region_ptr->set_deferred_obj_addr(NULL); |
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3212 region_ptr->set_completed(); |
0 | 3213 return; |
3214 } | |
3215 | |
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3216 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3217 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3218 // The partial object was copied from more than one source region. |
495
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3219 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3220 |
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3221 // Move to the next source region, possibly switching spaces as well. All |
0 | 3222 // args except end_addr may be modified. |
375
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3223 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3224 end_addr); |
0 | 3225 } |
3226 } | |
3227 | |
3228 do { | |
3229 HeapWord* const cur_addr = closure.source(); | |
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3230 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3231 src_space_top); |
3232 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3233 | |
3234 if (status == ParMarkBitMap::incomplete) { | |
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3235 // The last obj that starts in the source region does not end in the |
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3236 // region. |
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|
3237 assert(closure.source() < end_addr, "sanity"); |
0 | 3238 HeapWord* const obj_beg = closure.source(); |
3239 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3240 src_space_top); | |
3241 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3242 if (obj_end < range_end) { | |
3243 // The end was found; the entire object will fit. | |
3244 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3245 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3246 } else { | |
3247 // The end was not found; the object will not fit. | |
3248 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3249 status = ParMarkBitMap::would_overflow; | |
3250 } | |
3251 } | |
3252 | |
3253 if (status == ParMarkBitMap::would_overflow) { | |
3254 // The last object did not fit. Note that interior oop updates were | |
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3255 // deferred, then copy enough of the object to fill the region. |
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3256 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3257 status = closure.copy_until_full(); // copies from closure.source() |
3258 | |
495
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3259 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3260 closure.source()); |
375
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3261 region_ptr->set_completed(); |
0 | 3262 return; |
3263 } | |
3264 | |
3265 if (status == ParMarkBitMap::full) { | |
495
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3266 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3267 closure.source()); |
375
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3268 region_ptr->set_deferred_obj_addr(NULL); |
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3269 region_ptr->set_completed(); |
0 | 3270 return; |
3271 } | |
3272 | |
495
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3273 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3274 |
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3275 // Move to the next source region, possibly switching spaces as well. All |
0 | 3276 // args except end_addr may be modified. |
375
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3277 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3278 end_addr); |
0 | 3279 } while (true); |
3280 } | |
3281 | |
3282 void | |
3283 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3284 const MutableSpace* sp = space(space_id); | |
3285 if (sp->is_empty()) { | |
3286 return; | |
3287 } | |
3288 | |
3289 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3290 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3291 HeapWord* const dp_addr = dense_prefix(space_id); | |
3292 HeapWord* beg_addr = sp->bottom(); | |
3293 HeapWord* end_addr = sp->top(); | |
3294 | |
3295 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3296 | |
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3297 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3298 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3299 if (beg_region < dp_region) { |
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3300 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3301 } |
3302 | |
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3303 // The destination of the first live object that starts in the region is one |
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3304 // past the end of the partial object entering the region (if any). |
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3305 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3306 HeapWord* const new_top = _space_info[space_id].new_top(); |
3307 assert(new_top >= dest_addr, "bad new_top value"); | |
3308 const size_t words = pointer_delta(new_top, dest_addr); | |
3309 | |
3310 if (words > 0) { | |
3311 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3312 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3313 | |
3314 ParMarkBitMap::IterationStatus status; | |
3315 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3316 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3317 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3318 "live objects skipped because closure is full"); | |
3319 } | |
3320 } | |
3321 | |
3322 jlong PSParallelCompact::millis_since_last_gc() { | |
4712
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3323 // We need a monotonically non-deccreasing time in ms but |
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3324 // os::javaTimeMillis() does not guarantee monotonicity. |
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3325 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3326 jlong ret_val = now - _time_of_last_gc; |
0 | 3327 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3328 if (ret_val < 0) { | |
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3329 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3330 return 0; |
3331 } | |
3332 return ret_val; | |
3333 } | |
3334 | |
3335 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3336 // We need a monotonically non-deccreasing time in ms but |
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3337 // os::javaTimeMillis() does not guarantee monotonicity. |
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3338 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3339 } |
3340 | |
3341 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3342 { | |
3343 if (source() != destination()) { | |
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3344 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3345 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3346 } | |
3347 update_state(words_remaining()); | |
3348 assert(is_full(), "sanity"); | |
3349 return ParMarkBitMap::full; | |
3350 } | |
3351 | |
3352 void MoveAndUpdateClosure::copy_partial_obj() | |
3353 { | |
3354 size_t words = words_remaining(); | |
3355 | |
3356 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3357 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3358 if (end_addr < range_end) { | |
3359 words = bitmap()->obj_size(source(), end_addr); | |
3360 } | |
3361 | |
3362 // This test is necessary; if omitted, the pointer updates to a partial object | |
3363 // that crosses the dense prefix boundary could be overwritten. | |
3364 if (source() != destination()) { | |
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3365 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3366 Copy::aligned_conjoint_words(source(), destination(), words); |
3367 } | |
3368 update_state(words); | |
3369 } | |
3370 | |
3371 ParMarkBitMapClosure::IterationStatus | |
3372 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3373 assert(destination() != NULL, "sanity"); | |
3374 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3375 | |
3376 _source = addr; | |
3377 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3378 destination(), "wrong destination"); | |
3379 | |
3380 if (words > words_remaining()) { | |
3381 return ParMarkBitMap::would_overflow; | |
3382 } | |
3383 | |
3384 // The start_array must be updated even if the object is not moving. | |
3385 if (_start_array != NULL) { | |
3386 _start_array->allocate_block(destination()); | |
3387 } | |
3388 | |
3389 if (destination() != source()) { | |
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3390 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3391 Copy::aligned_conjoint_words(source(), destination(), words); |
3392 } | |
3393 | |
3394 oop moved_oop = (oop) destination(); | |
3395 moved_oop->update_contents(compaction_manager()); | |
3396 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3397 | |
3398 update_state(words); | |
3399 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3400 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3401 } | |
3402 | |
3403 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3404 ParCompactionManager* cm, | |
3405 PSParallelCompact::SpaceId space_id) : | |
3406 ParMarkBitMapClosure(mbm, cm), | |
3407 _space_id(space_id), | |
3408 _start_array(PSParallelCompact::start_array(space_id)) | |
3409 { | |
3410 } | |
3411 | |
3412 // Updates the references in the object to their new values. | |
3413 ParMarkBitMapClosure::IterationStatus | |
3414 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3415 do_addr(addr); | |
3416 return ParMarkBitMap::incomplete; | |
3417 } |