Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 2674:6ab73784566a
* BlockBegin.predecessors changed to List<BlockEnd>
* Node: add input/successor with given back edge index, allows for explicit ordering of predecessors/usages
* Graphviz: PDF output, option to omit FrameStates
* runscimark.sh: forward additional options to JVM
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 13 May 2011 15:18:41 +0200 |
parents | 92da084fefc9 |
children | eda9eb483d29 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2011, 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/psPermGen.hpp" | |
40 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
41 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
42 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
43 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
44 #include "gc_interface/gcCause.hpp" | |
45 #include "memory/gcLocker.inline.hpp" | |
46 #include "memory/referencePolicy.hpp" | |
47 #include "memory/referenceProcessor.hpp" | |
48 #include "oops/methodDataOop.hpp" | |
49 #include "oops/oop.inline.hpp" | |
50 #include "oops/oop.pcgc.inline.hpp" | |
51 #include "runtime/fprofiler.hpp" | |
52 #include "runtime/safepoint.hpp" | |
53 #include "runtime/vmThread.hpp" | |
54 #include "services/management.hpp" | |
55 #include "services/memoryService.hpp" | |
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; | |
92 klassOop PSParallelCompact::_updated_int_array_klass_obj = NULL; | |
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 | |
113
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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; | |
108 size_t PSParallelCompact::_live_oops_index_at_perm = 0; | |
113
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109 GrowableArray<void*>* PSParallelCompact::_other_refs_stack = NULL; |
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110 GrowableArray<void*>* PSParallelCompact::_adjusted_pointers = NULL; |
0 | 111 bool PSParallelCompact::_pointer_tracking = false; |
112 bool PSParallelCompact::_root_tracking = true; | |
113 | |
114 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops = NULL; | |
115 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops_moved_to = NULL; | |
116 GrowableArray<size_t> * PSParallelCompact::_cur_gc_live_oops_size = NULL; | |
117 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops = NULL; | |
118 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops_moved_to = NULL; | |
119 GrowableArray<size_t> * PSParallelCompact::_last_gc_live_oops_size = NULL; | |
120 #endif | |
121 | |
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122 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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123 HeapWord* destination) |
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124 { |
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125 assert(src_region_idx != 0, "invalid src_region_idx"); |
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126 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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127 assert(destination != NULL, "invalid destination argument"); |
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128 |
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129 _src_region_idx = src_region_idx; |
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130 _partial_obj_size = partial_obj_size; |
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131 _destination = destination; |
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132 |
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133 // These fields may not be updated below, so make sure they're clear. |
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134 assert(_dest_region_addr == NULL, "should have been cleared"); |
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135 assert(_first_src_addr == NULL, "should have been cleared"); |
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136 |
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137 // Determine the number of destination regions for the partial object. |
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138 HeapWord* const last_word = destination + partial_obj_size - 1; |
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139 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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140 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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141 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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142 |
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143 if (beg_region_addr == end_region_addr) { |
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144 // One destination region. |
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145 _destination_count = 1; |
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146 if (end_region_addr == destination) { |
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147 // The destination falls on a region boundary, thus the first word of the |
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148 // partial object will be the first word copied to the destination region. |
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149 _dest_region_addr = end_region_addr; |
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150 _first_src_addr = sd.region_to_addr(src_region_idx); |
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151 } |
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152 } else { |
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153 // Two destination regions. When copied, the partial object will cross a |
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154 // destination region boundary, so a word somewhere within the partial |
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155 // object will be the first word copied to the second destination region. |
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156 _destination_count = 2; |
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157 _dest_region_addr = end_region_addr; |
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158 const size_t ofs = pointer_delta(end_region_addr, destination); |
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159 assert(ofs < _partial_obj_size, "sanity"); |
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160 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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161 } |
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162 } |
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163 |
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164 void SplitInfo::clear() |
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165 { |
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166 _src_region_idx = 0; |
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167 _partial_obj_size = 0; |
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168 _destination = NULL; |
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169 _destination_count = 0; |
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170 _dest_region_addr = NULL; |
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171 _first_src_addr = NULL; |
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172 assert(!is_valid(), "sanity"); |
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173 } |
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174 |
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175 #ifdef ASSERT |
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176 void SplitInfo::verify_clear() |
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177 { |
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178 assert(_src_region_idx == 0, "not clear"); |
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179 assert(_partial_obj_size == 0, "not clear"); |
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180 assert(_destination == NULL, "not clear"); |
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181 assert(_destination_count == 0, "not clear"); |
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182 assert(_dest_region_addr == NULL, "not clear"); |
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183 assert(_first_src_addr == NULL, "not clear"); |
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184 } |
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185 #endif // #ifdef ASSERT |
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186 |
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187 |
0 | 188 #ifndef PRODUCT |
189 const char* PSParallelCompact::space_names[] = { | |
190 "perm", "old ", "eden", "from", "to " | |
191 }; | |
192 | |
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193 void PSParallelCompact::print_region_ranges() |
0 | 194 { |
195 tty->print_cr("space bottom top end new_top"); | |
196 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
197 | |
198 for (unsigned int id = 0; id < last_space_id; ++id) { | |
199 const MutableSpace* space = _space_info[id].space(); | |
200 tty->print_cr("%u %s " | |
264
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201 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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202 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 203 id, space_names[id], |
375
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204 summary_data().addr_to_region_idx(space->bottom()), |
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205 summary_data().addr_to_region_idx(space->top()), |
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206 summary_data().addr_to_region_idx(space->end()), |
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207 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 208 } |
209 } | |
210 | |
211 void | |
375
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212 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 213 { |
375
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214 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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215 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 216 |
217 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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218 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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219 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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220 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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221 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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222 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 223 i, c->data_location(), dci, c->destination(), |
224 c->partial_obj_size(), c->live_obj_size(), | |
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225 c->data_size(), c->source_region(), c->destination_count()); |
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226 |
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227 #undef REGION_IDX_FORMAT |
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228 #undef REGION_DATA_FORMAT |
0 | 229 } |
230 | |
231 void | |
232 print_generic_summary_data(ParallelCompactData& summary_data, | |
233 HeapWord* const beg_addr, | |
234 HeapWord* const end_addr) | |
235 { | |
236 size_t total_words = 0; | |
375
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237 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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238 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 239 HeapWord* pdest = 0; |
240 | |
241 while (i <= last) { | |
375
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242 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 243 if (c->data_size() != 0 || c->destination() != pdest) { |
375
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244 print_generic_summary_region(i, c); |
0 | 245 total_words += c->data_size(); |
246 pdest = c->destination(); | |
247 } | |
248 ++i; | |
249 } | |
250 | |
251 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
252 } | |
253 | |
254 void | |
255 print_generic_summary_data(ParallelCompactData& summary_data, | |
256 SpaceInfo* space_info) | |
257 { | |
258 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
259 const MutableSpace* space = space_info[id].space(); | |
260 print_generic_summary_data(summary_data, space->bottom(), | |
261 MAX2(space->top(), space_info[id].new_top())); | |
262 } | |
263 } | |
264 | |
265 void | |
375
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266 print_initial_summary_region(size_t i, |
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267 const ParallelCompactData::RegionData* c, |
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268 bool newline = true) |
0 | 269 { |
264
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270 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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271 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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272 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 273 i, c->destination(), |
274 c->partial_obj_size(), c->live_obj_size(), | |
375
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275 c->data_size(), c->source_region(), c->destination_count()); |
0 | 276 if (newline) tty->cr(); |
277 } | |
278 | |
279 void | |
280 print_initial_summary_data(ParallelCompactData& summary_data, | |
281 const MutableSpace* space) { | |
282 if (space->top() == space->bottom()) { | |
283 return; | |
284 } | |
285 | |
375
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286 const size_t region_size = ParallelCompactData::RegionSize; |
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287 typedef ParallelCompactData::RegionData RegionData; |
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288 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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289 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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290 const RegionData* c = summary_data.region(end_region - 1); |
0 | 291 HeapWord* end_addr = c->destination() + c->data_size(); |
292 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
293 | |
375
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294 // Print (and count) the full regions at the beginning of the space. |
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295 size_t full_region_count = 0; |
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296 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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297 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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298 print_initial_summary_region(i, summary_data.region(i)); |
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299 ++full_region_count; |
0 | 300 ++i; |
301 } | |
302 | |
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303 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 304 |
305 double max_reclaimed_ratio = 0.0; | |
375
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306 size_t max_reclaimed_ratio_region = 0; |
0 | 307 size_t max_dead_to_right = 0; |
308 size_t max_live_to_right = 0; | |
309 | |
375
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310 // Print the 'reclaimed ratio' for regions while there is something live in |
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311 // the region or to the right of it. The remaining regions are empty (and |
0 | 312 // uninteresting), and computing the ratio will result in division by 0. |
375
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313 while (i < end_region && live_to_right > 0) { |
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314 c = summary_data.region(i); |
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315 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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316 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 317 const size_t dead_to_right = used_to_right - live_to_right; |
318 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
319 | |
320 if (reclaimed_ratio > max_reclaimed_ratio) { | |
321 max_reclaimed_ratio = reclaimed_ratio; | |
375
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322 max_reclaimed_ratio_region = i; |
0 | 323 max_dead_to_right = dead_to_right; |
324 max_live_to_right = live_to_right; | |
325 } | |
326 | |
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327 print_initial_summary_region(i, c, false); |
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328 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 329 reclaimed_ratio, dead_to_right, live_to_right); |
330 | |
331 live_to_right -= c->data_size(); | |
332 ++i; | |
333 } | |
334 | |
375
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335 // Any remaining regions are empty. Print one more if there is one. |
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336 if (i < end_region) { |
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337 print_initial_summary_region(i, summary_data.region(i)); |
0 | 338 } |
339 | |
264
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340 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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341 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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342 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 343 max_live_to_right, max_reclaimed_ratio); |
344 } | |
345 | |
346 void | |
347 print_initial_summary_data(ParallelCompactData& summary_data, | |
348 SpaceInfo* space_info) { | |
349 unsigned int id = PSParallelCompact::perm_space_id; | |
350 const MutableSpace* space; | |
351 do { | |
352 space = space_info[id].space(); | |
353 print_initial_summary_data(summary_data, space); | |
354 } while (++id < PSParallelCompact::eden_space_id); | |
355 | |
356 do { | |
357 space = space_info[id].space(); | |
358 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
359 } while (++id < PSParallelCompact::last_space_id); | |
360 } | |
361 #endif // #ifndef PRODUCT | |
362 | |
363 #ifdef ASSERT | |
364 size_t add_obj_count; | |
365 size_t add_obj_size; | |
366 size_t mark_bitmap_count; | |
367 size_t mark_bitmap_size; | |
368 #endif // #ifdef ASSERT | |
369 | |
370 ParallelCompactData::ParallelCompactData() | |
371 { | |
372 _region_start = 0; | |
373 | |
375
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374 _region_vspace = 0; |
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375 _region_data = 0; |
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376 _region_count = 0; |
0 | 377 } |
378 | |
379 bool ParallelCompactData::initialize(MemRegion covered_region) | |
380 { | |
381 _region_start = covered_region.start(); | |
382 const size_t region_size = covered_region.word_size(); | |
383 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
384 | |
375
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385 assert(region_align_down(_region_start) == _region_start, |
0 | 386 "region start not aligned"); |
375
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387 assert((region_size & RegionSizeOffsetMask) == 0, |
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388 "region size not a multiple of RegionSize"); |
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389 |
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390 bool result = initialize_region_data(region_size); |
0 | 391 |
392 return result; | |
393 } | |
394 | |
395 PSVirtualSpace* | |
396 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
397 { | |
398 const size_t raw_bytes = count * element_size; | |
399 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
400 const size_t granularity = os::vm_allocation_granularity(); | |
401 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
402 | |
403 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
404 MAX2(page_sz, granularity); | |
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405 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 406 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
407 rs.size()); | |
408 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); | |
409 if (vspace != 0) { | |
410 if (vspace->expand_by(bytes)) { | |
411 return vspace; | |
412 } | |
413 delete vspace; | |
237
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414 // Release memory reserved in the space. |
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415 rs.release(); |
0 | 416 } |
417 | |
418 return 0; | |
419 } | |
420 | |
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421 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 422 { |
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423 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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424 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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425 if (_region_vspace != 0) { |
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426 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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427 _region_count = count; |
0 | 428 return true; |
429 } | |
430 return false; | |
431 } | |
432 | |
433 void ParallelCompactData::clear() | |
434 { | |
375
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435 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 436 } |
437 | |
375
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438 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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439 assert(beg_region <= _region_count, "beg_region out of range"); |
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440 assert(end_region <= _region_count, "end_region out of range"); |
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441 |
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442 const size_t region_cnt = end_region - beg_region; |
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443 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 444 } |
445 | |
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446 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 447 { |
375
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448 const RegionData* cur_cp = region(region_idx); |
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449 const RegionData* const end_cp = region(region_count() - 1); |
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450 |
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451 HeapWord* result = region_to_addr(region_idx); |
0 | 452 if (cur_cp < end_cp) { |
453 do { | |
454 result += cur_cp->partial_obj_size(); | |
375
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455 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 456 } |
457 return result; | |
458 } | |
459 | |
460 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
461 { | |
462 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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463 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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464 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 465 |
466 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
467 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
468 | |
375
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469 if (beg_region == end_region) { |
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470 // All in one region. |
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471 _region_data[beg_region].add_live_obj(len); |
0 | 472 return; |
473 } | |
474 | |
375
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475 // First region. |
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476 const size_t beg_ofs = region_offset(addr); |
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477 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 478 |
479 klassOop klass = ((oop)addr)->klass(); | |
375
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480 // Middle regions--completely spanned by this object. |
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481 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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482 _region_data[region].set_partial_obj_size(RegionSize); |
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483 _region_data[region].set_partial_obj_addr(addr); |
0 | 484 } |
485 | |
375
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486 // Last region. |
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487 const size_t end_ofs = region_offset(addr + len - 1); |
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488 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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489 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 490 } |
491 | |
492 void | |
493 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
494 { | |
375
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495 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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496 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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497 |
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498 size_t cur_region = addr_to_region_idx(beg); |
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499 const size_t end_region = addr_to_region_idx(end); |
0 | 500 HeapWord* addr = beg; |
375
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501 while (cur_region < end_region) { |
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502 _region_data[cur_region].set_destination(addr); |
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503 _region_data[cur_region].set_destination_count(0); |
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504 _region_data[cur_region].set_source_region(cur_region); |
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505 _region_data[cur_region].set_data_location(addr); |
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506 |
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507 // Update live_obj_size so the region appears completely full. |
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508 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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509 _region_data[cur_region].set_live_obj_size(live_size); |
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510 |
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511 ++cur_region; |
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512 addr += RegionSize; |
0 | 513 } |
514 } | |
515 | |
482
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516 // Find the point at which a space can be split and, if necessary, record the |
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517 // split point. |
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518 // |
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519 // If the current src region (which overflowed the destination space) doesn't |
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520 // have a partial object, the split point is at the beginning of the current src |
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521 // region (an "easy" split, no extra bookkeeping required). |
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522 // |
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523 // If the current src region has a partial object, the split point is in the |
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524 // region where that partial object starts (call it the split_region). If |
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525 // split_region has a partial object, then the split point is just after that |
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526 // partial object (a "hard" split where we have to record the split data and |
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527 // zero the partial_obj_size field). With a "hard" split, we know that the |
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528 // partial_obj ends within split_region because the partial object that caused |
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529 // the overflow starts in split_region. If split_region doesn't have a partial |
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530 // obj, then the split is at the beginning of split_region (another "easy" |
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|
531 // split). |
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532 HeapWord* |
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533 ParallelCompactData::summarize_split_space(size_t src_region, |
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534 SplitInfo& split_info, |
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535 HeapWord* destination, |
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536 HeapWord* target_end, |
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537 HeapWord** target_next) |
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538 { |
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539 assert(destination <= target_end, "sanity"); |
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540 assert(destination + _region_data[src_region].data_size() > target_end, |
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541 "region should not fit into target space"); |
696
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542 assert(is_region_aligned(target_end), "sanity"); |
482
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543 |
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544 size_t split_region = src_region; |
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545 HeapWord* split_destination = destination; |
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546 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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547 |
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548 if (destination + partial_obj_size > target_end) { |
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549 // The split point is just after the partial object (if any) in the |
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550 // src_region that contains the start of the object that overflowed the |
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|
551 // destination space. |
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|
552 // |
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553 // Find the start of the "overflow" object and set split_region to the |
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diff
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|
554 // region containing it. |
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555 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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556 split_region = addr_to_region_idx(overflow_obj); |
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557 |
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|
558 // Clear the source_region field of all destination regions whose first word |
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559 // came from data after the split point (a non-null source_region field |
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560 // implies a region must be filled). |
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561 // |
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diff
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562 // An alternative to the simple loop below: clear during post_compact(), |
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563 // which uses memcpy instead of individual stores, and is easy to |
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564 // parallelize. (The downside is that it clears the entire RegionData |
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565 // object as opposed to just one field.) |
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566 // |
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567 // post_compact() would have to clear the summary data up to the highest |
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568 // address that was written during the summary phase, which would be |
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|
569 // |
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570 // max(top, max(new_top, clear_top)) |
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571 // |
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572 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
696
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573 // to target_end. |
482
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574 const RegionData* const sr = region(split_region); |
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575 const size_t beg_idx = |
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576 addr_to_region_idx(region_align_up(sr->destination() + |
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577 sr->partial_obj_size())); |
696
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578 const size_t end_idx = addr_to_region_idx(target_end); |
482
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579 |
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580 if (TraceParallelOldGCSummaryPhase) { |
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581 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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582 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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583 beg_idx, end_idx); |
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584 } |
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585 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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586 _region_data[idx].set_source_region(0); |
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587 } |
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588 |
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589 // Set split_destination and partial_obj_size to reflect the split region. |
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590 split_destination = sr->destination(); |
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591 partial_obj_size = sr->partial_obj_size(); |
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592 } |
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593 |
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594 // The split is recorded only if a partial object extends onto the region. |
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595 if (partial_obj_size != 0) { |
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596 _region_data[split_region].set_partial_obj_size(0); |
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597 split_info.record(split_region, partial_obj_size, split_destination); |
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598 } |
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599 |
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|
600 // Setup the continuation addresses. |
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601 *target_next = split_destination + partial_obj_size; |
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602 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 603 |
604 if (TraceParallelOldGCSummaryPhase) { | |
482
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605 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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606 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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607 " pos=" SIZE_FORMAT, |
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|
608 split_type, source_next, split_region, |
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|
609 partial_obj_size); |
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610 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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611 " tn=" PTR_FORMAT, |
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612 split_type, split_destination, |
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613 addr_to_region_idx(split_destination), |
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614 *target_next); |
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615 |
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616 if (partial_obj_size != 0) { |
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617 HeapWord* const po_beg = split_info.destination(); |
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618 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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619 gclog_or_tty->print_cr("%s split: " |
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620 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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621 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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622 split_type, |
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623 po_beg, addr_to_region_idx(po_beg), |
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624 po_end, addr_to_region_idx(po_end)); |
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625 } |
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626 } |
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627 |
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628 return source_next; |
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629 } |
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630 |
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631 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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632 HeapWord* source_beg, HeapWord* source_end, |
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633 HeapWord** source_next, |
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634 HeapWord* target_beg, HeapWord* target_end, |
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635 HeapWord** target_next) |
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636 { |
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637 if (TraceParallelOldGCSummaryPhase) { |
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638 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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639 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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640 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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641 source_beg, source_end, source_next_val, |
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642 target_beg, target_end, *target_next); |
0 | 643 } |
644 | |
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645 size_t cur_region = addr_to_region_idx(source_beg); |
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646 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 647 |
648 HeapWord *dest_addr = target_beg; | |
375
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649 while (cur_region < end_region) { |
482
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650 // The destination must be set even if the region has no data. |
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651 _region_data[cur_region].set_destination(dest_addr); |
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652 |
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653 size_t words = _region_data[cur_region].data_size(); |
0 | 654 if (words > 0) { |
482
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655 // If cur_region does not fit entirely into the target space, find a point |
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656 // at which the source space can be 'split' so that part is copied to the |
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657 // target space and the rest is copied elsewhere. |
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658 if (dest_addr + words > target_end) { |
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659 assert(source_next != NULL, "source_next is NULL when splitting"); |
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660 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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661 target_end, target_next); |
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662 return false; |
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663 } |
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664 |
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665 // Compute the destination_count for cur_region, and if necessary, update |
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666 // source_region for a destination region. The source_region field is |
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667 // updated if cur_region is the first (left-most) region to be copied to a |
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668 // destination region. |
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669 // |
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670 // The destination_count calculation is a bit subtle. A region that has |
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671 // data that compacts into itself does not count itself as a destination. |
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672 // This maintains the invariant that a zero count means the region is |
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673 // available and can be claimed and then filled. |
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674 uint destination_count = 0; |
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675 if (split_info.is_split(cur_region)) { |
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676 // The current region has been split: the partial object will be copied |
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677 // to one destination space and the remaining data will be copied to |
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678 // another destination space. Adjust the initial destination_count and, |
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679 // if necessary, set the source_region field if the partial object will |
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680 // cross a destination region boundary. |
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681 destination_count = split_info.destination_count(); |
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682 if (destination_count == 2) { |
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683 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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684 _region_data[dest_idx].set_source_region(cur_region); |
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685 } |
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686 } |
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687 |
0 | 688 HeapWord* const last_addr = dest_addr + words - 1; |
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689 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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690 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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691 |
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692 // Initially assume that the destination regions will be the same and |
0 | 693 // adjust the value below if necessary. Under this assumption, if |
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694 // cur_region == dest_region_2, then cur_region will be compacted |
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695 // completely into itself. |
482
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696 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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697 if (dest_region_1 != dest_region_2) { |
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698 // Destination regions differ; adjust destination_count. |
0 | 699 destination_count += 1; |
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700 // Data from cur_region will be copied to the start of dest_region_2. |
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701 _region_data[dest_region_2].set_source_region(cur_region); |
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702 } else if (region_offset(dest_addr) == 0) { |
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703 // Data from cur_region will be copied to the start of the destination |
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704 // region. |
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705 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 706 } |
707 | |
375
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708 _region_data[cur_region].set_destination_count(destination_count); |
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709 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 710 dest_addr += words; |
711 } | |
712 | |
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713 ++cur_region; |
0 | 714 } |
715 | |
716 *target_next = dest_addr; | |
717 return true; | |
718 } | |
719 | |
720 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
721 assert(addr != NULL, "Should detect NULL oop earlier"); | |
722 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
723 #ifdef ASSERT | |
724 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
725 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
726 } | |
727 #endif | |
728 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
729 | |
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730 // Region covering the object. |
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731 size_t region_index = addr_to_region_idx(addr); |
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732 const RegionData* const region_ptr = region(region_index); |
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733 HeapWord* const region_addr = region_align_down(addr); |
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734 |
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735 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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736 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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737 |
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738 HeapWord* result = region_ptr->destination(); |
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739 |
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740 // If all the data in the region is live, then the new location of the object |
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741 // can be calculated from the destination of the region plus the offset of the |
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742 // object in the region. |
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743 if (region_ptr->data_size() == RegionSize) { |
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744 result += pointer_delta(addr, region_addr); |
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745 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 746 return result; |
747 } | |
748 | |
749 // The new location of the object is | |
375
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750 // region destination + |
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751 // size of the partial object extending onto the region + |
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752 // sizes of the live objects in the Region that are to the left of addr |
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753 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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754 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 755 |
756 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
757 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
758 | |
759 result += partial_obj_size + live_to_left; | |
495
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760 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 761 return result; |
762 } | |
763 | |
764 klassOop ParallelCompactData::calc_new_klass(klassOop old_klass) { | |
765 klassOop updated_klass; | |
766 if (PSParallelCompact::should_update_klass(old_klass)) { | |
767 updated_klass = (klassOop) calc_new_pointer(old_klass); | |
768 } else { | |
769 updated_klass = old_klass; | |
770 } | |
771 | |
772 return updated_klass; | |
773 } | |
774 | |
775 #ifdef ASSERT | |
776 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
777 { | |
778 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
779 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
780 for (const size_t* p = beg; p < end; ++p) { | |
781 assert(*p == 0, "not zero"); | |
782 } | |
783 } | |
784 | |
785 void ParallelCompactData::verify_clear() | |
786 { | |
375
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787 verify_clear(_region_vspace); |
0 | 788 } |
789 #endif // #ifdef ASSERT | |
790 | |
791 #ifdef NOT_PRODUCT | |
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792 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 793 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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794 return sd.region(region_index); |
0 | 795 } |
796 #endif | |
797 | |
798 elapsedTimer PSParallelCompact::_accumulated_time; | |
799 unsigned int PSParallelCompact::_total_invocations = 0; | |
800 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
801 jlong PSParallelCompact::_time_of_last_gc = 0; | |
802 CollectorCounters* PSParallelCompact::_counters = NULL; | |
803 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
804 ParallelCompactData PSParallelCompact::_summary_data; | |
805 | |
806 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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807 |
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808 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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809 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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810 |
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811 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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812 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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813 |
0 | 814 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_root_pointer_closure(true); |
815 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure(false); | |
816 | |
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817 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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818 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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819 |
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820 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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821 |
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822 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(_compaction_manager, p); } |
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823 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 824 |
825 void PSParallelCompact::post_initialize() { | |
826 ParallelScavengeHeap* heap = gc_heap(); | |
827 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
828 | |
829 MemRegion mr = heap->reserved_region(); | |
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830 _ref_processor = |
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831 new ReferenceProcessor(mr, // span |
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832 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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833 (int) ParallelGCThreads, // mt processing degree |
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834 true, // mt discovery |
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835 (int) ParallelGCThreads, // mt discovery degree |
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836 true, // atomic_discovery |
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837 &_is_alive_closure, // non-header is alive closure |
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838 false); // write barrier for next field updates |
0 | 839 _counters = new CollectorCounters("PSParallelCompact", 1); |
840 | |
841 // Initialize static fields in ParCompactionManager. | |
842 ParCompactionManager::initialize(mark_bitmap()); | |
843 } | |
844 | |
845 bool PSParallelCompact::initialize() { | |
846 ParallelScavengeHeap* heap = gc_heap(); | |
847 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
848 MemRegion mr = heap->reserved_region(); | |
849 | |
850 // Was the old gen get allocated successfully? | |
851 if (!heap->old_gen()->is_allocated()) { | |
852 return false; | |
853 } | |
854 | |
855 initialize_space_info(); | |
856 initialize_dead_wood_limiter(); | |
857 | |
858 if (!_mark_bitmap.initialize(mr)) { | |
859 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
860 "parallel garbage collection for the requested heap size."); | |
861 return false; | |
862 } | |
863 | |
864 if (!_summary_data.initialize(mr)) { | |
865 vm_shutdown_during_initialization("Unable to allocate tables for " | |
866 "parallel garbage collection for the requested heap size."); | |
867 return false; | |
868 } | |
869 | |
870 return true; | |
871 } | |
872 | |
873 void PSParallelCompact::initialize_space_info() | |
874 { | |
875 memset(&_space_info, 0, sizeof(_space_info)); | |
876 | |
877 ParallelScavengeHeap* heap = gc_heap(); | |
878 PSYoungGen* young_gen = heap->young_gen(); | |
879 MutableSpace* perm_space = heap->perm_gen()->object_space(); | |
880 | |
881 _space_info[perm_space_id].set_space(perm_space); | |
882 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); | |
883 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
884 _space_info[from_space_id].set_space(young_gen->from_space()); | |
885 _space_info[to_space_id].set_space(young_gen->to_space()); | |
886 | |
887 _space_info[perm_space_id].set_start_array(heap->perm_gen()->start_array()); | |
888 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
889 | |
890 _space_info[perm_space_id].set_min_dense_prefix(perm_space->top()); | |
891 if (TraceParallelOldGCDensePrefix) { | |
892 tty->print_cr("perm min_dense_prefix=" PTR_FORMAT, | |
893 _space_info[perm_space_id].min_dense_prefix()); | |
894 } | |
895 } | |
896 | |
897 void PSParallelCompact::initialize_dead_wood_limiter() | |
898 { | |
899 const size_t max = 100; | |
900 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
901 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
902 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
903 DEBUG_ONLY(_dwl_initialized = true;) | |
904 _dwl_adjustment = normal_distribution(1.0); | |
905 } | |
906 | |
907 // Simple class for storing info about the heap at the start of GC, to be used | |
908 // after GC for comparison/printing. | |
909 class PreGCValues { | |
910 public: | |
911 PreGCValues() { } | |
912 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
913 | |
914 void fill(ParallelScavengeHeap* heap) { | |
915 _heap_used = heap->used(); | |
916 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
917 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
918 _perm_gen_used = heap->perm_gen()->used_in_bytes(); | |
919 }; | |
920 | |
921 size_t heap_used() const { return _heap_used; } | |
922 size_t young_gen_used() const { return _young_gen_used; } | |
923 size_t old_gen_used() const { return _old_gen_used; } | |
924 size_t perm_gen_used() const { return _perm_gen_used; } | |
925 | |
926 private: | |
927 size_t _heap_used; | |
928 size_t _young_gen_used; | |
929 size_t _old_gen_used; | |
930 size_t _perm_gen_used; | |
931 }; | |
932 | |
933 void | |
934 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
935 { | |
936 // At this point, top is the value before GC, new_top() is the value that will | |
937 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
938 // should be marked above top. The summary data is cleared to the larger of | |
939 // top & new_top. | |
940 MutableSpace* const space = _space_info[id].space(); | |
941 HeapWord* const bot = space->bottom(); | |
942 HeapWord* const top = space->top(); | |
943 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
944 | |
945 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
946 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
947 _mark_bitmap.clear_range(beg_bit, end_bit); | |
948 | |
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949 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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950 const size_t end_region = |
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951 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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952 _summary_data.clear_range(beg_region, end_region); |
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953 |
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954 // Clear the data used to 'split' regions. |
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955 SplitInfo& split_info = _space_info[id].split_info(); |
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956 if (split_info.is_valid()) { |
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957 split_info.clear(); |
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958 } |
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959 DEBUG_ONLY(split_info.verify_clear();) |
0 | 960 } |
961 | |
962 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
963 { | |
964 // Update the from & to space pointers in space_info, since they are swapped | |
965 // at each young gen gc. Do the update unconditionally (even though a | |
966 // promotion failure does not swap spaces) because an unknown number of minor | |
967 // collections will have swapped the spaces an unknown number of times. | |
968 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
969 ParallelScavengeHeap* heap = gc_heap(); | |
970 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
971 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
972 | |
973 pre_gc_values->fill(heap); | |
974 | |
975 ParCompactionManager::reset(); | |
976 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
977 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
978 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
979 | |
980 // Increment the invocation count | |
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981 heap->increment_total_collections(true); |
0 | 982 |
983 // We need to track unique mark sweep invocations as well. | |
984 _total_invocations++; | |
985 | |
986 if (PrintHeapAtGC) { | |
987 Universe::print_heap_before_gc(); | |
988 } | |
989 | |
990 // Fill in TLABs | |
991 heap->accumulate_statistics_all_tlabs(); | |
992 heap->ensure_parsability(true); // retire TLABs | |
993 | |
994 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
995 HandleMark hm; // Discard invalid handles created during verification | |
996 gclog_or_tty->print(" VerifyBeforeGC:"); | |
997 Universe::verify(true); | |
998 } | |
999 | |
1000 // Verify object start arrays | |
1001 if (VerifyObjectStartArray && | |
1002 VerifyBeforeGC) { | |
1003 heap->old_gen()->verify_object_start_array(); | |
1004 heap->perm_gen()->verify_object_start_array(); | |
1005 } | |
1006 | |
1007 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
1008 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 1009 |
1010 // Have worker threads release resources the next time they run a task. | |
1011 gc_task_manager()->release_all_resources(); | |
0 | 1012 } |
1013 | |
1014 void PSParallelCompact::post_compact() | |
1015 { | |
1016 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
1017 | |
1018 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
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1019 // Clear the marking bitmap, summary data and split info. |
0 | 1020 clear_data_covering_space(SpaceId(id)); |
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1021 // Update top(). Must be done after clearing the bitmap and summary data. |
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1022 _space_info[id].publish_new_top(); |
0 | 1023 } |
1024 | |
1025 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1026 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1027 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1028 | |
1029 ParallelScavengeHeap* heap = gc_heap(); | |
1030 bool eden_empty = eden_space->is_empty(); | |
1031 if (!eden_empty) { | |
1032 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1033 heap->young_gen(), heap->old_gen()); | |
1034 } | |
1035 | |
1036 // Update heap occupancy information which is used as input to the soft ref | |
1037 // clearing policy at the next gc. | |
1038 Universe::update_heap_info_at_gc(); | |
1039 | |
1040 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1041 to_space->is_empty(); | |
1042 | |
1043 BarrierSet* bs = heap->barrier_set(); | |
1044 if (bs->is_a(BarrierSet::ModRef)) { | |
1045 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1046 MemRegion old_mr = heap->old_gen()->reserved(); | |
1047 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
1048 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
1049 | |
1050 if (young_gen_empty) { | |
1051 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
1052 } else { | |
1053 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
1054 } | |
1055 } | |
1056 | |
1057 Threads::gc_epilogue(); | |
1058 CodeCache::gc_epilogue(); | |
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1059 JvmtiExport::gc_epilogue(); |
0 | 1060 |
1061 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1062 | |
1063 ref_processor()->enqueue_discovered_references(NULL); | |
1064 | |
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1065 if (ZapUnusedHeapArea) { |
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1066 heap->gen_mangle_unused_area(); |
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1067 } |
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1068 |
0 | 1069 // Update time of last GC |
1070 reset_millis_since_last_gc(); | |
1071 } | |
1072 | |
1073 HeapWord* | |
1074 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1075 bool maximum_compaction) | |
1076 { | |
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1077 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1078 const ParallelCompactData& sd = summary_data(); |
1079 | |
1080 const MutableSpace* const space = _space_info[id].space(); | |
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1081 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1082 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1083 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1084 |
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1085 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1086 // of the dense prefix. |
1087 size_t full_count = 0; | |
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1088 const RegionData* cp; |
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1089 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1090 ++full_count; |
1091 } | |
1092 | |
1093 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1094 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1095 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1096 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1097 _maximum_compaction_gc_num = total_invocations(); | |
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1098 return sd.region_to_addr(cp); |
0 | 1099 } |
1100 | |
1101 HeapWord* const new_top = _space_info[id].new_top(); | |
1102 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1103 const size_t space_used = space->used_in_words(); | |
1104 const size_t space_capacity = space->capacity_in_words(); | |
1105 | |
1106 const double cur_density = double(space_live) / space_capacity; | |
1107 const double deadwood_density = | |
1108 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1109 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1110 | |
1111 if (TraceParallelOldGCDensePrefix) { | |
1112 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1113 cur_density, deadwood_density, deadwood_goal); | |
1114 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1115 "space_cap=" SIZE_FORMAT, | |
1116 space_live, space_used, | |
1117 space_capacity); | |
1118 } | |
1119 | |
1120 // XXX - Use binary search? | |
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1121 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1122 const RegionData* full_cp = cp; |
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1123 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1124 while (cp < end_cp) { |
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1125 HeapWord* region_destination = cp->destination(); |
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1126 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1127 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1128 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1129 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1130 sd.region(cp), region_destination, |
0 | 1131 dense_prefix, cur_deadwood); |
1132 } | |
1133 | |
1134 if (cur_deadwood >= deadwood_goal) { | |
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1135 // Found the region that has the correct amount of deadwood to the left. |
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1136 // This typically occurs after crossing a fairly sparse set of regions, so |
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1137 // iterate backwards over those sparse regions, looking for the region |
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1138 // that has the lowest density of live objects 'to the right.' |
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1139 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1140 size_t live_to_left = space_to_left - cur_deadwood; |
1141 size_t space_to_right = space_capacity - space_to_left; | |
1142 size_t live_to_right = space_live - live_to_left; | |
1143 double density_to_right = double(live_to_right) / space_to_right; | |
1144 while (cp > full_cp) { | |
1145 --cp; | |
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1146 const size_t prev_region_live_to_right = live_to_right - |
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1147 cp->data_size(); |
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1148 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1149 double prev_region_density_to_right = |
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1150 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1151 if (density_to_right <= prev_region_density_to_right) { |
0 | 1152 return dense_prefix; |
1153 } | |
1154 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1155 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1156 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1157 prev_region_density_to_right); |
0 | 1158 } |
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1159 dense_prefix -= region_size; |
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1160 live_to_right = prev_region_live_to_right; |
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1161 space_to_right = prev_region_space_to_right; |
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1162 density_to_right = prev_region_density_to_right; |
0 | 1163 } |
1164 return dense_prefix; | |
1165 } | |
1166 | |
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1167 dense_prefix += region_size; |
0 | 1168 ++cp; |
1169 } | |
1170 | |
1171 return dense_prefix; | |
1172 } | |
1173 | |
1174 #ifndef PRODUCT | |
1175 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1176 const SpaceId id, | |
1177 const bool maximum_compaction, | |
1178 HeapWord* const addr) | |
1179 { | |
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1180 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1181 RegionData* const cp = summary_data().region(region_idx); |
0 | 1182 const MutableSpace* const space = _space_info[id].space(); |
1183 HeapWord* const new_top = _space_info[id].new_top(); | |
1184 | |
1185 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1186 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1187 const size_t space_cap = space->capacity_in_words(); | |
1188 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1189 const size_t live_to_right = new_top - cp->destination(); | |
1190 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1191 | |
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1192 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1193 "spl=" SIZE_FORMAT " " |
1194 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1195 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1196 " ratio=%10.8f", | |
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1197 algorithm, addr, region_idx, |
0 | 1198 space_live, |
1199 dead_to_left, dead_to_left_pct, | |
1200 dead_to_right, live_to_right, | |
1201 double(dead_to_right) / live_to_right); | |
1202 } | |
1203 #endif // #ifndef PRODUCT | |
1204 | |
1205 // Return a fraction indicating how much of the generation can be treated as | |
1206 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1207 // based on the density of live objects in the generation to determine a limit, | |
1208 // which is then adjusted so the return value is min_percent when the density is | |
1209 // 1. | |
1210 // | |
1211 // The following table shows some return values for a different values of the | |
1212 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1213 // min_percent is 1. | |
1214 // | |
1215 // fraction allowed as dead wood | |
1216 // ----------------------------------------------------------------- | |
1217 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1218 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1219 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1220 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1221 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1222 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1223 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1224 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1225 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1226 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1227 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1228 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1229 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1230 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1231 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1232 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1233 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1234 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1235 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1236 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1237 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1238 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1239 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1240 | |
1241 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1242 { | |
1243 assert(_dwl_initialized, "uninitialized"); | |
1244 | |
1245 // The raw limit is the value of the normal distribution at x = density. | |
1246 const double raw_limit = normal_distribution(density); | |
1247 | |
1248 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1249 // | |
1250 // First subtract the adjustment value (which is simply the precomputed value | |
1251 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1252 // Then add the minimum value, so the minimum is returned when the density is | |
1253 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1254 const double min = double(min_percent) / 100.0; | |
1255 const double limit = raw_limit - _dwl_adjustment + min; | |
1256 return MAX2(limit, 0.0); | |
1257 } | |
1258 | |
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1259 ParallelCompactData::RegionData* |
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1260 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1261 const RegionData* end) |
0 | 1262 { |
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1263 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1264 ParallelCompactData& sd = summary_data(); |
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1265 size_t left = sd.region(beg); |
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1266 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1267 |
1268 // Binary search. | |
1269 while (left < right) { | |
1270 // Equivalent to (left + right) / 2, but does not overflow. | |
1271 const size_t middle = left + (right - left) / 2; | |
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1272 RegionData* const middle_ptr = sd.region(middle); |
0 | 1273 HeapWord* const dest = middle_ptr->destination(); |
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1274 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1275 assert(dest != NULL, "sanity"); |
1276 assert(dest <= addr, "must move left"); | |
1277 | |
1278 if (middle > left && dest < addr) { | |
1279 right = middle - 1; | |
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1280 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1281 left = middle + 1; |
1282 } else { | |
1283 return middle_ptr; | |
1284 } | |
1285 } | |
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1286 return sd.region(left); |
0 | 1287 } |
1288 | |
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1289 ParallelCompactData::RegionData* |
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1290 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1291 const RegionData* end, |
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1292 size_t dead_words) |
0 | 1293 { |
1294 ParallelCompactData& sd = summary_data(); | |
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1295 size_t left = sd.region(beg); |
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1296 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1297 |
1298 // Binary search. | |
1299 while (left < right) { | |
1300 // Equivalent to (left + right) / 2, but does not overflow. | |
1301 const size_t middle = left + (right - left) / 2; | |
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1302 RegionData* const middle_ptr = sd.region(middle); |
0 | 1303 HeapWord* const dest = middle_ptr->destination(); |
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1304 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1305 assert(dest != NULL, "sanity"); |
1306 assert(dest <= addr, "must move left"); | |
1307 | |
1308 const size_t dead_to_left = pointer_delta(addr, dest); | |
1309 if (middle > left && dead_to_left > dead_words) { | |
1310 right = middle - 1; | |
1311 } else if (middle < right && dead_to_left < dead_words) { | |
1312 left = middle + 1; | |
1313 } else { | |
1314 return middle_ptr; | |
1315 } | |
1316 } | |
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1317 return sd.region(left); |
0 | 1318 } |
1319 | |
1320 // The result is valid during the summary phase, after the initial summarization | |
1321 // of each space into itself, and before final summarization. | |
1322 inline double | |
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1323 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1324 HeapWord* const bottom, |
1325 HeapWord* const top, | |
1326 HeapWord* const new_top) | |
1327 { | |
1328 ParallelCompactData& sd = summary_data(); | |
1329 | |
1330 assert(cp != NULL, "sanity"); | |
1331 assert(bottom != NULL, "sanity"); | |
1332 assert(top != NULL, "sanity"); | |
1333 assert(new_top != NULL, "sanity"); | |
1334 assert(top >= new_top, "summary data problem?"); | |
1335 assert(new_top > bottom, "space is empty; should not be here"); | |
1336 assert(new_top >= cp->destination(), "sanity"); | |
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1337 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1338 |
1339 HeapWord* const destination = cp->destination(); | |
1340 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1341 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1342 const size_t compacted_region_used = pointer_delta(top, |
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1343 sd.region_to_addr(cp)); |
0 | 1344 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1345 | |
1346 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1347 return double(reclaimable) / divisor; | |
1348 } | |
1349 | |
1350 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1351 // compacted region. The address is always on a region boundary. |
0 | 1352 // |
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1353 // Completely full regions at the left are skipped, since no compaction can |
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1354 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1355 // computed, based on the density (amount live / capacity) of the generation; |
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1356 // the region with approximately that amount of dead space to the left is |
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1357 // identified as the limit region. Regions between the last completely full |
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1358 // region and the limit region are scanned and the one that has the best |
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1359 // (maximum) reclaimed_ratio() is selected. |
0 | 1360 HeapWord* |
1361 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1362 bool maximum_compaction) | |
1363 { | |
483
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1364 if (ParallelOldGCSplitALot) { |
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1365 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1366 // The value was chosen to provoke splitting a young gen space; use it. |
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1367 return _space_info[id].dense_prefix(); |
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1368 } |
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1369 } |
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1370 |
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1371 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1372 const ParallelCompactData& sd = summary_data(); |
1373 | |
1374 const MutableSpace* const space = _space_info[id].space(); | |
1375 HeapWord* const top = space->top(); | |
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1376 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1377 HeapWord* const new_top = _space_info[id].new_top(); |
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1378 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1379 HeapWord* const bottom = space->bottom(); |
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1380 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1381 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1382 const RegionData* const new_top_cp = |
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1383 sd.addr_to_region_ptr(new_top_aligned_up); |
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1384 |
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1385 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1386 // of the dense prefix. |
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1387 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1388 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1389 space->is_empty(), "no dead space allowed to the left"); |
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1390 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1391 "region must have dead space"); |
0 | 1392 |
1393 // The gc number is saved whenever a maximum compaction is done, and used to | |
1394 // determine when the maximum compaction interval has expired. This avoids | |
1395 // successive max compactions for different reasons. | |
1396 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1397 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1398 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1399 total_invocations() == HeapFirstMaximumCompactionCount; | |
1400 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1401 _maximum_compaction_gc_num = total_invocations(); | |
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1402 return sd.region_to_addr(full_cp); |
0 | 1403 } |
1404 | |
1405 const size_t space_live = pointer_delta(new_top, bottom); | |
1406 const size_t space_used = space->used_in_words(); | |
1407 const size_t space_capacity = space->capacity_in_words(); | |
1408 | |
1409 const double density = double(space_live) / double(space_capacity); | |
1410 const size_t min_percent_free = | |
1411 id == perm_space_id ? PermMarkSweepDeadRatio : MarkSweepDeadRatio; | |
1412 const double limiter = dead_wood_limiter(density, min_percent_free); | |
1413 const size_t dead_wood_max = space_used - space_live; | |
1414 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1415 dead_wood_max); | |
1416 | |
1417 if (TraceParallelOldGCDensePrefix) { | |
1418 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1419 "space_cap=" SIZE_FORMAT, | |
1420 space_live, space_used, | |
1421 space_capacity); | |
1422 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1423 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1424 density, min_percent_free, limiter, | |
1425 dead_wood_max, dead_wood_limit); | |
1426 } | |
1427 | |
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1428 // Locate the region with the desired amount of dead space to the left. |
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1429 const RegionData* const limit_cp = |
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1430 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1431 |
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1432 // Scan from the first region with dead space to the limit region and find the |
0 | 1433 // one with the best (largest) reclaimed ratio. |
1434 double best_ratio = 0.0; | |
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1435 const RegionData* best_cp = full_cp; |
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1436 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1437 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1438 if (tmp_ratio > best_ratio) { | |
1439 best_cp = cp; | |
1440 best_ratio = tmp_ratio; | |
1441 } | |
1442 } | |
1443 | |
1444 #if 0 | |
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1445 // Something to consider: if the region with the best ratio is 'close to' the |
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1446 // first region w/free space, choose the first region with free space |
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1447 // ("first-free"). The first-free region is usually near the start of the |
0 | 1448 // heap, which means we are copying most of the heap already, so copy a bit |
1449 // more to get complete compaction. | |
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1450 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1451 _maximum_compaction_gc_num = total_invocations(); |
1452 best_cp = full_cp; | |
1453 } | |
1454 #endif // #if 0 | |
1455 | |
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1456 return sd.region_to_addr(best_cp); |
0 | 1457 } |
1458 | |
483
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1459 #ifndef PRODUCT |
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1460 void |
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1461 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1462 size_t words) |
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1463 { |
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1464 if (TraceParallelOldGCSummaryPhase) { |
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1465 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1466 SIZE_FORMAT, start, start + words, words); |
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1467 } |
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1468 |
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1469 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1470 CollectedHeap::fill_with_objects(start, words); |
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1471 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1472 _mark_bitmap.mark_obj(p, words); |
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1473 _summary_data.add_obj(p, words); |
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1474 start_array->allocate_block(p); |
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1475 } |
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1476 } |
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1477 |
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1478 void |
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1479 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1480 { |
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1481 ParallelCompactData& sd = summary_data(); |
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1482 MutableSpace* space = _space_info[id].space(); |
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1483 |
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1484 // Find the source and destination start addresses. |
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1485 HeapWord* const src_addr = sd.region_align_down(start); |
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1486 HeapWord* dst_addr; |
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1487 if (src_addr < start) { |
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1488 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1489 } else if (src_addr > space->bottom()) { |
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1490 // The start (the original top() value) is aligned to a region boundary so |
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1491 // the associated region does not have a destination. Compute the |
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1492 // destination from the previous region. |
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1493 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1494 dst_addr = cp->destination() + cp->data_size(); |
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1495 } else { |
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1496 // Filling the entire space. |
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1497 dst_addr = space->bottom(); |
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1498 } |
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1499 assert(dst_addr != NULL, "sanity"); |
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1500 |
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1501 // Update the summary data. |
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1502 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1503 src_addr, space->top(), NULL, |
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1504 dst_addr, space->end(), |
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1505 _space_info[id].new_top_addr()); |
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1506 assert(result, "should not fail: bad filler object size"); |
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1507 } |
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1508 |
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1509 void |
496
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1510 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1511 { |
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1512 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1513 return; |
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1514 } |
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1515 |
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1516 MutableSpace* const space = _space_info[id].space(); |
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1517 if (space->is_empty()) { |
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1518 HeapWord* b = space->bottom(); |
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1519 HeapWord* t = b + space->capacity_in_words() / 2; |
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1520 space->set_top(t); |
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1521 if (ZapUnusedHeapArea) { |
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1522 space->set_top_for_allocations(); |
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1523 } |
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1524 |
1571
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1525 size_t min_size = CollectedHeap::min_fill_size(); |
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1526 size_t obj_len = min_size; |
496
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1527 while (b + obj_len <= t) { |
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1528 CollectedHeap::fill_with_object(b, obj_len); |
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1529 mark_bitmap()->mark_obj(b, obj_len); |
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1530 summary_data().add_obj(b, obj_len); |
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1531 b += obj_len; |
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1532 obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ... |
496
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1533 } |
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1534 if (b < t) { |
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1535 // The loop didn't completely fill to t (top); adjust top downward. |
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1536 space->set_top(b); |
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1537 if (ZapUnusedHeapArea) { |
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|
1538 space->set_top_for_allocations(); |
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|
1539 } |
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|
1540 } |
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|
1541 |
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|
1542 HeapWord** nta = _space_info[id].new_top_addr(); |
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|
1543 bool result = summary_data().summarize(_space_info[id].split_info(), |
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|
1544 space->bottom(), space->top(), NULL, |
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diff
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|
1545 space->bottom(), space->end(), nta); |
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|
1546 assert(result, "space must fit into itself"); |
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diff
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|
1547 } |
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|
1548 } |
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diff
changeset
|
1549 |
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495
diff
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|
1550 void |
483
0f773163217d
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|
1551 PSParallelCompact::provoke_split(bool & max_compaction) |
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|
1552 { |
496
b27c885f75f9
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|
1553 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
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|
1554 return; |
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|
1555 } |
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|
1556 |
483
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|
1557 const size_t region_size = ParallelCompactData::RegionSize; |
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1558 ParallelCompactData& sd = summary_data(); |
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changeset
|
1559 |
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|
1560 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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1561 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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1562 const size_t eden_live = pointer_delta(eden_space->top(), |
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1563 _space_info[eden_space_id].new_top()); |
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1564 const size_t from_live = pointer_delta(from_space->top(), |
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1565 _space_info[from_space_id].new_top()); |
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|
1566 |
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1567 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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1568 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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1569 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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1570 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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1571 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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1572 |
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|
1573 // Choose the space to split; need at least 2 regions live (or fillable). |
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1574 SpaceId id; |
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1575 MutableSpace* space; |
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1576 size_t live_words; |
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|
1577 size_t fill_words; |
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1578 if (eden_live + eden_fillable >= region_size * 2) { |
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|
1579 id = eden_space_id; |
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1580 space = eden_space; |
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1581 live_words = eden_live; |
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1582 fill_words = eden_fillable; |
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|
1583 } else if (from_live + from_fillable >= region_size * 2) { |
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|
1584 id = from_space_id; |
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|
1585 space = from_space; |
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|
1586 live_words = from_live; |
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|
1587 fill_words = from_fillable; |
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|
1588 } else { |
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|
1589 return; // Give up. |
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|
1590 } |
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|
1591 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
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1592 |
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1593 if (live_words < region_size * 2) { |
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1594 // Fill from top() to end() w/live objects of mixed sizes. |
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|
1595 HeapWord* const fill_start = space->top(); |
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|
1596 live_words += fill_words; |
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changeset
|
1597 |
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|
1598 space->set_top(fill_start + fill_words); |
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|
1599 if (ZapUnusedHeapArea) { |
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|
1600 space->set_top_for_allocations(); |
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|
1601 } |
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|
1602 |
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changeset
|
1603 HeapWord* cur_addr = fill_start; |
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|
1604 while (fill_words > 0) { |
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1605 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1606 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1607 if (fill_words - cur_size < min_fill_size) { |
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1608 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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|
1609 } |
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|
1610 |
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|
1611 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1612 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1613 sd.add_obj(cur_addr, cur_size); |
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|
1614 |
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1615 cur_addr += cur_size; |
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|
1616 fill_words -= cur_size; |
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|
1617 } |
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|
1618 |
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|
1619 summarize_new_objects(id, fill_start); |
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|
1620 } |
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|
1621 |
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|
1622 max_compaction = false; |
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|
1623 |
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|
1624 // Manipulate the old gen so that it has room for about half of the live data |
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1625 // in the target young gen space (live_words / 2). |
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|
1626 id = old_space_id; |
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|
1627 space = _space_info[id].space(); |
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|
1628 const size_t free_at_end = space->free_in_words(); |
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1629 const size_t free_target = align_object_size(live_words / 2); |
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1630 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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|
1631 |
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|
1632 if (free_at_end >= free_target + min_fill_size) { |
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|
1633 // Fill space above top() and set the dense prefix so everything survives. |
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|
1634 HeapWord* const fill_start = space->top(); |
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|
1635 const size_t fill_size = free_at_end - free_target; |
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|
1636 space->set_top(space->top() + fill_size); |
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|
1637 if (ZapUnusedHeapArea) { |
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|
1638 space->set_top_for_allocations(); |
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|
1639 } |
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|
1640 fill_with_live_objects(id, fill_start, fill_size); |
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|
1641 summarize_new_objects(id, fill_start); |
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|
1642 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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|
1643 } else if (dead + free_at_end > free_target) { |
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|
1644 // Find a dense prefix that makes the right amount of space available. |
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|
1645 HeapWord* cur = sd.region_align_down(space->top()); |
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|
1646 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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|
1647 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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482
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|
1648 while (dead_to_right < free_target) { |
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changeset
|
1649 cur -= region_size; |
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changeset
|
1650 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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|
1651 dead_to_right = pointer_delta(space->end(), cur_destination); |
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|
1652 } |
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|
1653 _space_info[id].set_dense_prefix(cur); |
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|
1654 } |
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|
1655 } |
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|
1656 #endif // #ifndef PRODUCT |
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|
1657 |
0 | 1658 void PSParallelCompact::summarize_spaces_quick() |
1659 { | |
1660 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1661 const MutableSpace* space = _space_info[i].space(); | |
482
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|
1662 HeapWord** nta = _space_info[i].new_top_addr(); |
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|
1663 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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|
1664 space->bottom(), space->top(), NULL, |
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changeset
|
1665 space->bottom(), space->end(), nta); |
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|
1666 assert(result, "space must fit into itself"); |
0 | 1667 _space_info[i].set_dense_prefix(space->bottom()); |
1668 } | |
496
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|
1669 |
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|
1670 #ifndef PRODUCT |
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1671 if (ParallelOldGCSplitALot) { |
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1672 provoke_split_fill_survivor(to_space_id); |
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1673 } |
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1674 #endif // #ifndef PRODUCT |
0 | 1675 } |
1676 | |
1677 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1678 { | |
1679 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1680 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1681 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
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1682 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1683 // Only enough dead space is filled so that any remaining dead space to the |
1684 // left is larger than the minimum filler object. (The remainder is filled | |
1685 // during the copy/update phase.) | |
1686 // | |
1687 // The size of the dead space to the right of the boundary is not a | |
1688 // concern, since compaction will be able to use whatever space is | |
1689 // available. | |
1690 // | |
1691 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1692 // surrounds the space to be filled with an object. | |
1693 // | |
1694 // In the 32-bit VM, each bit represents two 32-bit words: | |
1695 // +---+ | |
1696 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1697 // end_bits: ... x x x | 0 | || 0 x x ... | |
1698 // +---+ | |
1699 // | |
1700 // In the 64-bit VM, each bit represents one 64-bit word: | |
1701 // +------------+ | |
1702 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1703 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1704 // +------------+ | |
1705 // +-------+ | |
1706 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1707 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1708 // +-------+ | |
1709 // +-----------+ | |
1710 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1711 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1712 // +-----------+ | |
1713 // +-------+ | |
1714 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1715 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1716 // +-------+ | |
1717 | |
1718 // Initially assume case a, c or e will apply. | |
1571
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1719 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1720 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1721 | |
1722 #ifdef _LP64 | |
1571
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1723 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1724 // Cases a, c or e. |
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1725 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1726 // Case b above. |
1727 obj_beg = dense_prefix_end - 1; | |
1728 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1729 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1730 // Case d above. | |
1731 obj_beg = dense_prefix_end - 3; | |
1732 obj_len = 3; | |
1733 } | |
1734 #endif // #ifdef _LP64 | |
1735 | |
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1736 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1737 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1738 _summary_data.add_obj(obj_beg, obj_len); | |
1739 assert(start_array(id) != NULL, "sanity"); | |
1740 start_array(id)->allocate_block(obj_beg); | |
1741 } | |
1742 } | |
1743 | |
1744 void | |
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1745 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1746 { |
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1747 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1748 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1749 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1750 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1751 cur->set_source_region(0); |
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1752 } |
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1753 } |
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1754 |
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1755 void |
0 | 1756 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1757 { | |
1758 assert(id < last_space_id, "id out of range"); | |
483
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1759 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1760 ParallelOldGCSplitALot && id == old_space_id, |
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1761 "should have been reset in summarize_spaces_quick()"); |
0 | 1762 |
1763 const MutableSpace* space = _space_info[id].space(); | |
265
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1764 if (_space_info[id].new_top() != space->bottom()) { |
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1765 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1766 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1767 |
1768 #ifndef PRODUCT | |
265
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1769 if (TraceParallelOldGCDensePrefix) { |
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1770 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1771 dense_prefix_end); |
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1772 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1773 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1774 } |
0 | 1775 #endif // #ifndef PRODUCT |
1776 | |
483
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1777 // Recompute the summary data, taking into account the dense prefix. If |
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1778 // every last byte will be reclaimed, then the existing summary data which |
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1779 // compacts everything can be left in place. |
265
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1780 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1781 // If dead space crosses the dense prefix boundary, it is (at least |
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1782 // partially) filled with a dummy object, marked live and added to the |
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1783 // summary data. This simplifies the copy/update phase and must be done |
483
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1784 // before the final locations of objects are determined, to prevent |
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1785 // leaving a fragment of dead space that is too small to fill. |
265
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1786 fill_dense_prefix_end(id); |
482
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1787 |
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1788 // Compute the destination of each Region, and thus each object. |
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1789 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1790 _summary_data.summarize(_space_info[id].split_info(), |
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1791 dense_prefix_end, space->top(), NULL, |
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1792 dense_prefix_end, space->end(), |
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1793 _space_info[id].new_top_addr()); |
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1794 } |
0 | 1795 } |
1796 | |
1797 if (TraceParallelOldGCSummaryPhase) { | |
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1798 const size_t region_size = ParallelCompactData::RegionSize; |
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1799 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
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1800 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1801 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1802 HeapWord* const new_top = _space_info[id].new_top(); |
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1803 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1804 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1805 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
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1806 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1807 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1808 id, space->capacity_in_words(), dense_prefix_end, | |
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1809 dp_region, dp_words / region_size, |
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1810 cr_words / region_size, new_top); |
0 | 1811 } |
1812 } | |
1813 | |
482
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1814 #ifndef PRODUCT |
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1815 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1816 HeapWord* dst_beg, HeapWord* dst_end, |
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1817 SpaceId src_space_id, |
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1818 HeapWord* src_beg, HeapWord* src_end) |
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1819 { |
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1820 if (TraceParallelOldGCSummaryPhase) { |
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1821 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1822 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1823 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1824 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1825 SIZE_FORMAT "-" SIZE_FORMAT, |
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1826 src_space_id, space_names[src_space_id], |
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1827 dst_space_id, space_names[dst_space_id], |
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1828 src_beg, src_end, |
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1829 _summary_data.addr_to_region_idx(src_beg), |
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1830 _summary_data.addr_to_region_idx(src_end), |
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1831 dst_beg, dst_end, |
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1832 _summary_data.addr_to_region_idx(dst_beg), |
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1833 _summary_data.addr_to_region_idx(dst_end)); |
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1834 } |
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1835 } |
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1836 #endif // #ifndef PRODUCT |
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1837 |
0 | 1838 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1839 bool maximum_compaction) | |
1840 { | |
1841 EventMark m("2 summarize"); | |
1842 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1843 // trace("2"); | |
1844 | |
1845 #ifdef ASSERT | |
1846 if (TraceParallelOldGCMarkingPhase) { | |
1847 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1848 "add_obj_bytes=" SIZE_FORMAT, | |
1849 add_obj_count, add_obj_size * HeapWordSize); | |
1850 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1851 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1852 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1853 } | |
1854 #endif // #ifdef ASSERT | |
1855 | |
1856 // Quick summarization of each space into itself, to see how much is live. | |
1857 summarize_spaces_quick(); | |
1858 | |
1859 if (TraceParallelOldGCSummaryPhase) { | |
1860 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1861 Universe::print(); | |
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1862 NOT_PRODUCT(print_region_ranges()); |
0 | 1863 if (Verbose) { |
1864 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1865 } | |
1866 } | |
1867 | |
1868 // The amount of live data that will end up in old space (assuming it fits). | |
1869 size_t old_space_total_live = 0; | |
482
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1870 assert(perm_space_id < old_space_id, "should not count perm data here"); |
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1871 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1872 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1873 _space_info[id].space()->bottom()); | |
1874 } | |
1875 | |
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1876 MutableSpace* const old_space = _space_info[old_space_id].space(); |
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1877 const size_t old_capacity = old_space->capacity_in_words(); |
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1878 if (old_space_total_live > old_capacity) { |
0 | 1879 // XXX - should also try to expand |
1880 maximum_compaction = true; | |
1881 } | |
483
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1882 #ifndef PRODUCT |
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1883 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1884 provoke_split(maximum_compaction); |
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1885 } |
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1886 #endif // #ifndef PRODUCT |
0 | 1887 |
1888 // Permanent and Old generations. | |
1889 summarize_space(perm_space_id, maximum_compaction); | |
1890 summarize_space(old_space_id, maximum_compaction); | |
1891 | |
482
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1892 // Summarize the remaining spaces in the young gen. The initial target space |
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1893 // is the old gen. If a space does not fit entirely into the target, then the |
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1894 // remainder is compacted into the space itself and that space becomes the new |
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1895 // target. |
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1896 SpaceId dst_space_id = old_space_id; |
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1897 HeapWord* dst_space_end = old_space->end(); |
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1898 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1899 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1900 const MutableSpace* space = _space_info[id].space(); |
1901 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1902 space->bottom()); | |
482
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1903 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1904 |
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1905 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1906 SpaceId(id), space->bottom(), space->top());) |
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1907 if (live > 0 && live <= available) { |
0 | 1908 // All the live data will fit. |
482
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1909 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1910 space->bottom(), space->top(), |
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1911 NULL, |
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1912 *new_top_addr, dst_space_end, |
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1913 new_top_addr); |
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1914 assert(done, "space must fit into old gen"); |
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1915 |
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1916 // Reset the new_top value for the space. |
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1917 _space_info[id].set_new_top(space->bottom()); |
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1918 } else if (live > 0) { |
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1919 // Attempt to fit part of the source space into the target space. |
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1920 HeapWord* next_src_addr = NULL; |
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1921 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1922 space->bottom(), space->top(), |
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1923 &next_src_addr, |
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1924 *new_top_addr, dst_space_end, |
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1925 new_top_addr); |
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1926 assert(!done, "space should not fit into old gen"); |
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1927 assert(next_src_addr != NULL, "sanity"); |
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1928 |
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1929 // The source space becomes the new target, so the remainder is compacted |
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1930 // within the space itself. |
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1931 dst_space_id = SpaceId(id); |
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1932 dst_space_end = space->end(); |
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1933 new_top_addr = _space_info[id].new_top_addr(); |
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1934 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1935 space->bottom(), dst_space_end, |
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1936 SpaceId(id), next_src_addr, space->top());) |
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1937 done = _summary_data.summarize(_space_info[id].split_info(), |
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1938 next_src_addr, space->top(), |
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1939 NULL, |
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1940 space->bottom(), dst_space_end, |
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1941 new_top_addr); |
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1942 assert(done, "space must fit when compacted into itself"); |
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1943 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1944 } |
1945 } | |
1946 | |
1947 if (TraceParallelOldGCSummaryPhase) { | |
1948 tty->print_cr("summary_phase: after final summarization"); | |
1949 Universe::print(); | |
375
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1950 NOT_PRODUCT(print_region_ranges()); |
0 | 1951 if (Verbose) { |
1952 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1953 } | |
1954 } | |
1955 } | |
1956 | |
1957 // This method should contain all heap-specific policy for invoking a full | |
1958 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1959 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1960 // before full gc, or any other specialized behavior, it needs to be added here. | |
1961 // | |
1962 // Note that this method should only be called from the vm_thread while at a | |
1963 // safepoint. | |
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1964 // |
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1965 // Note that the all_soft_refs_clear flag in the collector policy |
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1966 // may be true because this method can be called without intervening |
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1967 // activity. For example when the heap space is tight and full measure |
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1968 // are being taken to free space. |
0 | 1969 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1970 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1971 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1972 "should be in vm thread"); | |
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1973 |
0 | 1974 ParallelScavengeHeap* heap = gc_heap(); |
1975 GCCause::Cause gc_cause = heap->gc_cause(); | |
1976 assert(!heap->is_gc_active(), "not reentrant"); | |
1977 | |
1978 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1979 IsGCActiveMark mark; |
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1980 |
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1981 if (ScavengeBeforeFullGC) { |
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1982 PSScavenge::invoke_no_policy(); |
0 | 1983 } |
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1984 |
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1985 const bool clear_all_soft_refs = |
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1986 heap->collector_policy()->should_clear_all_soft_refs(); |
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1987 |
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1988 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1989 maximum_heap_compaction); |
0 | 1990 } |
1991 | |
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1992 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1993 size_t addr_region_index = addr_to_region_idx(addr); |
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1994 return region_index == addr_region_index; |
0 | 1995 } |
1996 | |
1997 // This method contains no policy. You should probably | |
1998 // be calling invoke() instead. | |
1999 void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { | |
2000 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
2001 assert(ref_processor() != NULL, "Sanity"); | |
2002 | |
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2003 if (GC_locker::check_active_before_gc()) { |
0 | 2004 return; |
2005 } | |
2006 | |
2007 TimeStamp marking_start; | |
2008 TimeStamp compaction_start; | |
2009 TimeStamp collection_exit; | |
2010 | |
2011 ParallelScavengeHeap* heap = gc_heap(); | |
2012 GCCause::Cause gc_cause = heap->gc_cause(); | |
2013 PSYoungGen* young_gen = heap->young_gen(); | |
2014 PSOldGen* old_gen = heap->old_gen(); | |
2015 PSPermGen* perm_gen = heap->perm_gen(); | |
2016 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
2017 | |
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2018 // The scope of casr should end after code that can change |
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2019 // CollectorPolicy::_should_clear_all_soft_refs. |
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2020 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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2021 heap->collector_policy()); |
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2022 |
263
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2023 if (ZapUnusedHeapArea) { |
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2024 // Save information needed to minimize mangling |
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2025 heap->record_gen_tops_before_GC(); |
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2026 } |
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2027 |
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2028 heap->pre_full_gc_dump(); |
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2029 |
0 | 2030 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2031 | |
2032 // Make sure data structures are sane, make the heap parsable, and do other | |
2033 // miscellaneous bookkeeping. | |
2034 PreGCValues pre_gc_values; | |
2035 pre_compact(&pre_gc_values); | |
2036 | |
210 | 2037 // Get the compaction manager reserved for the VM thread. |
2038 ParCompactionManager* const vmthread_cm = | |
2039 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2040 | |
0 | 2041 // Place after pre_compact() where the number of invocations is incremented. |
2042 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2043 | |
2044 { | |
2045 ResourceMark rm; | |
2046 HandleMark hm; | |
2047 | |
2048 const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc; | |
2049 | |
2050 // This is useful for debugging but don't change the output the | |
2051 // the customer sees. | |
2052 const char* gc_cause_str = "Full GC"; | |
2053 if (is_system_gc && PrintGCDetails) { | |
2054 gc_cause_str = "Full GC (System)"; | |
2055 } | |
2056 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
2057 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
2058 TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty); | |
2059 TraceCollectorStats tcs(counters()); | |
2060 TraceMemoryManagerStats tms(true /* Full GC */); | |
2061 | |
2062 if (TraceGen1Time) accumulated_time()->start(); | |
2063 | |
2064 // Let the size policy know we're starting | |
2065 size_policy->major_collection_begin(); | |
2066 | |
2067 // When collecting the permanent generation methodOops may be moving, | |
2068 // so we either have to flush all bcp data or convert it into bci. | |
2069 CodeCache::gc_prologue(); | |
2070 Threads::gc_prologue(); | |
2071 | |
2072 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
2073 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2074 | |
2075 ref_processor()->enable_discovery(); | |
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2076 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2077 |
2078 bool marked_for_unloading = false; | |
2079 | |
2080 marking_start.update(); | |
210 | 2081 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2082 |
2083 #ifndef PRODUCT | |
2084 if (TraceParallelOldGCMarkingPhase) { | |
2085 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
2086 "cas_by_another %d", | |
2087 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
2088 mark_bitmap()->cas_by_another()); | |
2089 } | |
2090 #endif // #ifndef PRODUCT | |
2091 | |
2092 bool max_on_system_gc = UseMaximumCompactionOnSystemGC && is_system_gc; | |
210 | 2093 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2094 |
2095 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2096 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2097 | |
2098 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2099 // needed by the compaction for filling holes in the dense prefix. | |
2100 adjust_roots(); | |
2101 | |
2102 compaction_start.update(); | |
2103 // Does the perm gen always have to be done serially because | |
2104 // klasses are used in the update of an object? | |
210 | 2105 compact_perm(vmthread_cm); |
0 | 2106 |
2107 if (UseParallelOldGCCompacting) { | |
2108 compact(); | |
2109 } else { | |
210 | 2110 compact_serial(vmthread_cm); |
0 | 2111 } |
2112 | |
2113 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2114 // done before resizing. | |
2115 post_compact(); | |
2116 | |
2117 // Let the size policy know we're done | |
2118 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2119 | |
2120 if (UseAdaptiveSizePolicy) { | |
2121 if (PrintAdaptiveSizePolicy) { | |
2122 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2123 gclog_or_tty->stamp(); | |
2124 gclog_or_tty->print_cr(" collection: %d ", | |
2125 heap->total_collections()); | |
2126 if (Verbose) { | |
2127 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
2128 " perm_gen_capacity: %d ", | |
2129 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
2130 perm_gen->capacity_in_bytes()); | |
2131 } | |
2132 } | |
2133 | |
2134 // Don't check if the size_policy is ready here. Let | |
2135 // the size_policy check that internally. | |
2136 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2137 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2138 UseAdaptiveSizePolicyWithSystemGC)) { | |
2139 // Calculate optimal free space amounts | |
2140 assert(young_gen->max_size() > | |
2141 young_gen->from_space()->capacity_in_bytes() + | |
2142 young_gen->to_space()->capacity_in_bytes(), | |
2143 "Sizes of space in young gen are out-of-bounds"); | |
2144 size_t max_eden_size = young_gen->max_size() - | |
2145 young_gen->from_space()->capacity_in_bytes() - | |
2146 young_gen->to_space()->capacity_in_bytes(); | |
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2147 size_policy->compute_generation_free_space( |
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2148 young_gen->used_in_bytes(), |
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2149 young_gen->eden_space()->used_in_bytes(), |
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2150 old_gen->used_in_bytes(), |
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2151 perm_gen->used_in_bytes(), |
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2152 young_gen->eden_space()->capacity_in_bytes(), |
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2153 old_gen->max_gen_size(), |
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2154 max_eden_size, |
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2155 true /* full gc*/, |
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2156 gc_cause, |
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2157 heap->collector_policy()); |
263
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2158 |
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2159 heap->resize_old_gen( |
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2160 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2161 |
2162 // Don't resize the young generation at an major collection. A | |
2163 // desired young generation size may have been calculated but | |
2164 // resizing the young generation complicates the code because the | |
2165 // resizing of the old generation may have moved the boundary | |
2166 // between the young generation and the old generation. Let the | |
2167 // young generation resizing happen at the minor collections. | |
2168 } | |
2169 if (PrintAdaptiveSizePolicy) { | |
2170 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2171 heap->total_collections()); | |
2172 } | |
2173 } | |
2174 | |
2175 if (UsePerfData) { | |
2176 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2177 counters->update_counters(); | |
2178 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2179 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2180 } | |
2181 | |
2182 heap->resize_all_tlabs(); | |
2183 | |
2184 // We collected the perm gen, so we'll resize it here. | |
2185 perm_gen->compute_new_size(pre_gc_values.perm_gen_used()); | |
2186 | |
2187 if (TraceGen1Time) accumulated_time()->stop(); | |
2188 | |
2189 if (PrintGC) { | |
2190 if (PrintGCDetails) { | |
2191 // No GC timestamp here. This is after GC so it would be confusing. | |
2192 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2193 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2194 heap->print_heap_change(pre_gc_values.heap_used()); | |
2195 // Print perm gen last (print_heap_change() excludes the perm gen). | |
2196 perm_gen->print_used_change(pre_gc_values.perm_gen_used()); | |
2197 } else { | |
2198 heap->print_heap_change(pre_gc_values.heap_used()); | |
2199 } | |
2200 } | |
2201 | |
2202 // Track memory usage and detect low memory | |
2203 MemoryService::track_memory_usage(); | |
2204 heap->update_counters(); | |
2205 } | |
2206 | |
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2207 #ifdef ASSERT |
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2208 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2209 ParCompactionManager* const cm = |
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2210 ParCompactionManager::manager_array(int(i)); |
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2211 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2212 assert(cm->region_stack()->is_empty(), "should be empty"); |
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2213 assert(cm->revisit_klass_stack()->is_empty(), "should be empty"); |
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2214 } |
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2215 #endif // ASSERT |
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2216 |
0 | 2217 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2218 HandleMark hm; // Discard invalid handles created during verification | |
2219 gclog_or_tty->print(" VerifyAfterGC:"); | |
2220 Universe::verify(false); | |
2221 } | |
2222 | |
2223 // Re-verify object start arrays | |
2224 if (VerifyObjectStartArray && | |
2225 VerifyAfterGC) { | |
2226 old_gen->verify_object_start_array(); | |
2227 perm_gen->verify_object_start_array(); | |
2228 } | |
2229 | |
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2230 if (ZapUnusedHeapArea) { |
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2231 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2232 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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2233 } |
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2234 |
0 | 2235 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2236 | |
2237 collection_exit.update(); | |
2238 | |
2239 if (PrintHeapAtGC) { | |
2240 Universe::print_heap_after_gc(); | |
2241 } | |
2242 if (PrintGCTaskTimeStamps) { | |
2243 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2244 INT64_FORMAT, | |
2245 marking_start.ticks(), compaction_start.ticks(), | |
2246 collection_exit.ticks()); | |
2247 gc_task_manager()->print_task_time_stamps(); | |
2248 } | |
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2249 |
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2250 heap->post_full_gc_dump(); |
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2251 |
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2252 #ifdef TRACESPINNING |
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2253 ParallelTaskTerminator::print_termination_counts(); |
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2254 #endif |
0 | 2255 } |
2256 | |
2257 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2258 PSYoungGen* young_gen, | |
2259 PSOldGen* old_gen) { | |
2260 MutableSpace* const eden_space = young_gen->eden_space(); | |
2261 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2262 assert(young_gen->virtual_space()->alignment() == | |
2263 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2264 | |
2265 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2266 return false; | |
2267 } | |
2268 | |
2269 // Both generations must be completely committed. | |
2270 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2271 return false; | |
2272 } | |
2273 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2274 return false; | |
2275 } | |
2276 | |
2277 // Figure out how much to take from eden. Include the average amount promoted | |
2278 // in the total; otherwise the next young gen GC will simply bail out to a | |
2279 // full GC. | |
2280 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2281 const size_t eden_used = eden_space->used_in_bytes(); | |
2282 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2283 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2284 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2285 | |
2286 if (absorb_size >= eden_capacity) { | |
2287 return false; // Must leave some space in eden. | |
2288 } | |
2289 | |
2290 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2291 if (new_young_size < young_gen->min_gen_size()) { | |
2292 return false; // Respect young gen minimum size. | |
2293 } | |
2294 | |
2295 if (TraceAdaptiveGCBoundary && Verbose) { | |
2296 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2297 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2298 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2299 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2300 absorb_size / K, | |
2301 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2302 young_gen->from_space()->used_in_bytes() / K, | |
2303 young_gen->to_space()->used_in_bytes() / K, | |
2304 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2305 } | |
2306 | |
2307 // Fill the unused part of the old gen. | |
2308 MutableSpace* const old_space = old_gen->object_space(); | |
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2309 HeapWord* const unused_start = old_space->top(); |
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2310 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2311 |
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2312 if (unused_words > 0) { |
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2313 if (unused_words < CollectedHeap::min_fill_size()) { |
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2314 return false; // If the old gen cannot be filled, must give up. |
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2315 } |
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2316 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2317 } |
2318 | |
2319 // Take the live data from eden and set both top and end in the old gen to | |
2320 // eden top. (Need to set end because reset_after_change() mangles the region | |
2321 // from end to virtual_space->high() in debug builds). | |
2322 HeapWord* const new_top = eden_space->top(); | |
2323 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2324 absorb_size); | |
2325 young_gen->reset_after_change(); | |
2326 old_space->set_top(new_top); | |
2327 old_space->set_end(new_top); | |
2328 old_gen->reset_after_change(); | |
2329 | |
2330 // Update the object start array for the filler object and the data from eden. | |
2331 ObjectStartArray* const start_array = old_gen->start_array(); | |
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2332 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2333 start_array->allocate_block(p); |
0 | 2334 } |
2335 | |
2336 // Could update the promoted average here, but it is not typically updated at | |
2337 // full GCs and the value to use is unclear. Something like | |
2338 // | |
2339 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2340 | |
2341 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2342 return true; | |
2343 } | |
2344 | |
2345 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2346 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2347 "shouldn't return NULL"); | |
2348 return ParallelScavengeHeap::gc_task_manager(); | |
2349 } | |
2350 | |
2351 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2352 bool maximum_heap_compaction) { | |
2353 // Recursively traverse all live objects and mark them | |
2354 EventMark m("1 mark object"); | |
2355 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2356 | |
2357 ParallelScavengeHeap* heap = gc_heap(); | |
2358 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2359 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
0 | 2360 ParallelTaskTerminator terminator(parallel_gc_threads, qset); |
2361 | |
2362 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2363 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2364 | |
2365 { | |
2366 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
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2367 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2368 |
2369 GCTaskQueue* q = GCTaskQueue::create(); | |
2370 | |
2371 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2372 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2373 // We scan the thread roots in parallel | |
2374 Threads::create_thread_roots_marking_tasks(q); | |
2375 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2376 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2377 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2378 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2379 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2380 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2381 |
2382 if (parallel_gc_threads > 1) { | |
2383 for (uint j = 0; j < parallel_gc_threads; j++) { | |
2384 q->enqueue(new StealMarkingTask(&terminator)); | |
2385 } | |
2386 } | |
2387 | |
2388 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
2389 q->enqueue(fin); | |
2390 | |
2391 gc_task_manager()->add_list(q); | |
2392 | |
2393 fin->wait_for(); | |
2394 | |
2395 // We have to release the barrier tasks! | |
2396 WaitForBarrierGCTask::destroy(fin); | |
2397 } | |
2398 | |
2399 // Process reference objects found during marking | |
2400 { | |
2401 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2402 if (ref_processor()->processing_is_mt()) { | |
2403 RefProcTaskExecutor task_executor; | |
2404 ref_processor()->process_discovered_references( | |
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2405 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2406 &task_executor); |
0 | 2407 } else { |
2408 ref_processor()->process_discovered_references( | |
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2409 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2410 } |
2411 } | |
2412 | |
2413 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2414 // Follow system dictionary roots and unload classes. | |
2415 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2416 | |
2417 // Follow code cache roots. | |
2418 CodeCache::do_unloading(is_alive_closure(), &mark_and_push_closure, | |
2419 purged_class); | |
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2420 cm->follow_marking_stacks(); // Flush marking stack. |
0 | 2421 |
2422 // Update subklass/sibling/implementor links of live klasses | |
2423 // revisit_klass_stack is used in follow_weak_klass_links(). | |
941 | 2424 follow_weak_klass_links(); |
2425 | |
2426 // Revisit memoized MDO's and clear any unmarked weak refs | |
2427 follow_mdo_weak_refs(); | |
0 | 2428 |
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2429 // Visit interned string tables and delete unmarked oops |
0 | 2430 StringTable::unlink(is_alive_closure()); |
2177
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2431 // Clean up unreferenced symbols in symbol table. |
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2432 SymbolTable::unlink(); |
0 | 2433 |
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2434 assert(cm->marking_stacks_empty(), "marking stacks should be empty"); |
0 | 2435 } |
2436 | |
2437 // This should be moved to the shared markSweep code! | |
2438 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2439 public: | |
2440 void do_object(oop p) { ShouldNotReachHere(); } | |
2441 bool do_object_b(oop p) { return true; } | |
2442 }; | |
2443 static PSAlwaysTrueClosure always_true; | |
2444 | |
2445 void PSParallelCompact::adjust_roots() { | |
2446 // Adjust the pointers to reflect the new locations | |
2447 EventMark m("3 adjust roots"); | |
2448 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2449 | |
2450 // General strong roots. | |
2451 Universe::oops_do(adjust_root_pointer_closure()); | |
2452 ReferenceProcessor::oops_do(adjust_root_pointer_closure()); | |
2453 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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2454 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 2455 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
2456 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
2457 Management::oops_do(adjust_root_pointer_closure()); | |
2458 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
2459 // SO_AllClasses | |
2460 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
2461 | |
2462 // Now adjust pointers in remaining weak roots. (All of which should | |
2463 // have been cleared if they pointed to non-surviving objects.) | |
2464 // Global (weak) JNI handles | |
2465 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
2466 | |
2467 CodeCache::oops_do(adjust_pointer_closure()); | |
2468 StringTable::oops_do(adjust_root_pointer_closure()); | |
2469 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
2470 // Roots were visited so references into the young gen in roots | |
2471 // may have been scanned. Process them also. | |
2472 // Should the reference processor have a span that excludes | |
2473 // young gen objects? | |
2474 PSScavenge::reference_processor()->weak_oops_do( | |
2475 adjust_root_pointer_closure()); | |
2476 } | |
2477 | |
2478 void PSParallelCompact::compact_perm(ParCompactionManager* cm) { | |
2479 EventMark m("4 compact perm"); | |
2480 TraceTime tm("compact perm gen", print_phases(), true, gclog_or_tty); | |
2481 // trace("4"); | |
2482 | |
2483 gc_heap()->perm_gen()->start_array()->reset(); | |
2484 move_and_update(cm, perm_space_id); | |
2485 } | |
2486 | |
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2487 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2488 uint parallel_gc_threads) |
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2489 { |
0 | 2490 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2491 | |
2492 const unsigned int task_count = MAX2(parallel_gc_threads, 1U); | |
2493 for (unsigned int j = 0; j < task_count; j++) { | |
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2494 q->enqueue(new DrainStacksCompactionTask(j)); |
0 | 2495 } |
2496 | |
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2497 // Find all regions that are available (can be filled immediately) and |
0 | 2498 // distribute them to the thread stacks. The iteration is done in reverse |
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2499 // order (high to low) so the regions will be removed in ascending order. |
0 | 2500 |
2501 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2502 | |
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2503 size_t fillable_regions = 0; // A count for diagnostic purposes. |
0 | 2504 unsigned int which = 0; // The worker thread number. |
2505 | |
2506 for (unsigned int id = to_space_id; id > perm_space_id; --id) { | |
2507 SpaceInfo* const space_info = _space_info + id; | |
2508 MutableSpace* const space = space_info->space(); | |
2509 HeapWord* const new_top = space_info->new_top(); | |
2510 | |
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2511 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2512 const size_t end_region = |
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2513 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2514 assert(end_region > 0, "perm gen cannot be empty"); |
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2515 |
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2516 for (size_t cur = end_region - 1; cur >= beg_region; --cur) { |
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2517 if (sd.region(cur)->claim_unsafe()) { |
0 | 2518 ParCompactionManager* cm = ParCompactionManager::manager_array(which); |
1638 | 2519 cm->push_region(cur); |
0 | 2520 |
2521 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2522 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2523 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
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2524 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2525 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2526 } | |
2527 | |
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2528 NOT_PRODUCT(++fillable_regions;) |
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2529 |
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2530 // Assign regions to threads in round-robin fashion. |
0 | 2531 if (++which == task_count) { |
2532 which = 0; | |
2533 } | |
2534 } | |
2535 } | |
2536 } | |
2537 | |
2538 if (TraceParallelOldGCCompactionPhase) { | |
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2539 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2540 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2541 } |
2542 } | |
2543 | |
2544 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2545 | |
2546 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2547 uint parallel_gc_threads) { | |
2548 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2549 | |
2550 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2551 | |
2552 // Iterate over all the spaces adding tasks for updating | |
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2553 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2554 // will work on opening the gaps and the remaining gc threads |
2555 // will work on the dense prefix. | |
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2556 unsigned int space_id; |
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2557 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2558 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2559 const MutableSpace* const space = _space_info[space_id].space(); | |
2560 | |
2561 if (dense_prefix_end == space->bottom()) { | |
2562 // There is no dense prefix for this space. | |
2563 continue; | |
2564 } | |
2565 | |
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2566 // The dense prefix is before this region. |
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2567 size_t region_index_end_dense_prefix = |
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2568 sd.addr_to_region_idx(dense_prefix_end); |
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2569 RegionData* const dense_prefix_cp = |
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2570 sd.region(region_index_end_dense_prefix); |
0 | 2571 assert(dense_prefix_end == space->end() || |
2572 dense_prefix_cp->available() || | |
2573 dense_prefix_cp->claimed(), | |
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2574 "The region after the dense prefix should always be ready to fill"); |
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2575 |
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2576 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2577 |
2578 // Is there dense prefix work? | |
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2579 size_t total_dense_prefix_regions = |
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2580 region_index_end_dense_prefix - region_index_start; |
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2581 // How many regions of the dense prefix should be given to |
0 | 2582 // each thread? |
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2583 if (total_dense_prefix_regions > 0) { |
0 | 2584 uint tasks_for_dense_prefix = 1; |
2585 if (UseParallelDensePrefixUpdate) { | |
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2586 if (total_dense_prefix_regions <= |
0 | 2587 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
2588 // Don't over partition. This assumes that | |
2589 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value | |
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2590 // so there are not many regions to process. |
0 | 2591 tasks_for_dense_prefix = parallel_gc_threads; |
2592 } else { | |
2593 // Over partition | |
2594 tasks_for_dense_prefix = parallel_gc_threads * | |
2595 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; | |
2596 } | |
2597 } | |
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2598 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2599 tasks_for_dense_prefix; |
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2600 // Give each thread at least 1 region. |
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2601 if (regions_per_thread == 0) { |
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2602 regions_per_thread = 1; |
0 | 2603 } |
2604 | |
2605 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2606 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2607 break; |
2608 } | |
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2609 // region_index_end is not processed |
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2610 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2611 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)); |
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2615 region_index_start = region_index_end; |
0 | 2616 } |
2617 } | |
2618 // This gets any part of the dense prefix that did not | |
2619 // fit evenly. | |
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2620 if (region_index_start < region_index_end_dense_prefix) { |
482
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2621 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2622 region_index_start, |
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2623 region_index_end_dense_prefix)); |
0 | 2624 } |
482
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2625 } |
0 | 2626 } |
2627 | |
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2628 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2629 GCTaskQueue* q, |
2630 ParallelTaskTerminator* terminator_ptr, | |
2631 uint parallel_gc_threads) { | |
2632 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2633 | |
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2634 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2635 // other threads. |
2636 if (parallel_gc_threads > 1) { | |
2637 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2638 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2639 } |
2640 } | |
2641 } | |
2642 | |
2643 void PSParallelCompact::compact() { | |
2644 EventMark m("5 compact"); | |
2645 // trace("5"); | |
2646 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2647 | |
2648 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2649 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2650 PSOldGen* old_gen = heap->old_gen(); | |
2651 old_gen->start_array()->reset(); | |
2652 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2653 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
0 | 2654 ParallelTaskTerminator terminator(parallel_gc_threads, qset); |
2655 | |
2656 GCTaskQueue* q = GCTaskQueue::create(); | |
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2657 enqueue_region_draining_tasks(q, parallel_gc_threads); |
0 | 2658 enqueue_dense_prefix_tasks(q, parallel_gc_threads); |
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2659 enqueue_region_stealing_tasks(q, &terminator, parallel_gc_threads); |
0 | 2660 |
2661 { | |
2662 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2663 | |
2664 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
2665 q->enqueue(fin); | |
2666 | |
2667 gc_task_manager()->add_list(q); | |
2668 | |
2669 fin->wait_for(); | |
2670 | |
2671 // We have to release the barrier tasks! | |
2672 WaitForBarrierGCTask::destroy(fin); | |
2673 | |
2674 #ifdef ASSERT | |
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2675 // Verify that all regions have been processed before the deferred updates. |
0 | 2676 // Note that perm_space_id is skipped; this type of verification is not |
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2677 // valid until the perm gen is compacted by regions. |
0 | 2678 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2679 verify_complete(SpaceId(id)); | |
2680 } | |
2681 #endif | |
2682 } | |
2683 | |
2684 { | |
2685 // Update the deferred objects, if any. Any compaction manager can be used. | |
2686 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2687 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2688 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2689 update_deferred_objects(cm, SpaceId(id)); | |
2690 } | |
2691 } | |
2692 } | |
2693 | |
2694 #ifdef ASSERT | |
2695 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2696 // All Regions between space bottom() to new_top() should be marked as filled |
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2697 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2698 // should have been emptied). |
2699 ParallelCompactData& sd = summary_data(); | |
2700 SpaceInfo si = _space_info[space_id]; | |
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2701 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2702 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2703 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2704 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2705 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2706 |
2707 bool issued_a_warning = false; | |
2708 | |
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2709 size_t cur_region; |
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2710 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2711 const RegionData* const c = sd.region(cur_region); |
0 | 2712 if (!c->completed()) { |
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2713 warning("region " SIZE_FORMAT " not filled: " |
0 | 2714 "destination_count=" SIZE_FORMAT, |
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2715 cur_region, c->destination_count()); |
0 | 2716 issued_a_warning = true; |
2717 } | |
2718 } | |
2719 | |
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2720 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2721 const RegionData* const c = sd.region(cur_region); |
0 | 2722 if (!c->available()) { |
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2723 warning("region " SIZE_FORMAT " not empty: " |
0 | 2724 "destination_count=" SIZE_FORMAT, |
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2725 cur_region, c->destination_count()); |
0 | 2726 issued_a_warning = true; |
2727 } | |
2728 } | |
2729 | |
2730 if (issued_a_warning) { | |
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2731 print_region_ranges(); |
0 | 2732 } |
2733 } | |
2734 #endif // #ifdef ASSERT | |
2735 | |
2736 void PSParallelCompact::compact_serial(ParCompactionManager* cm) { | |
2737 EventMark m("5 compact serial"); | |
2738 TraceTime tm("compact serial", print_phases(), true, gclog_or_tty); | |
2739 | |
2740 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2741 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2742 | |
2743 PSYoungGen* young_gen = heap->young_gen(); | |
2744 PSOldGen* old_gen = heap->old_gen(); | |
2745 | |
2746 old_gen->start_array()->reset(); | |
2747 old_gen->move_and_update(cm); | |
2748 young_gen->move_and_update(cm); | |
2749 } | |
2750 | |
2751 void | |
941 | 2752 PSParallelCompact::follow_weak_klass_links() { |
0 | 2753 // All klasses on the revisit stack are marked at this point. |
2754 // Update and follow all subklass, sibling and implementor links. | |
941 | 2755 if (PrintRevisitStats) { |
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2756 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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2757 SystemDictionary::number_of_classes()); |
941 | 2758 } |
2759 for (uint i = 0; i < ParallelGCThreads + 1; i++) { | |
0 | 2760 ParCompactionManager* cm = ParCompactionManager::manager_array(i); |
2761 KeepAliveClosure keep_alive_closure(cm); | |
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2762 Stack<Klass*>* const rks = cm->revisit_klass_stack(); |
941 | 2763 if (PrintRevisitStats) { |
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2764 gclog_or_tty->print_cr("Revisit klass stack[%u] length = " SIZE_FORMAT, |
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2765 i, rks->size()); |
941 | 2766 } |
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2767 while (!rks->is_empty()) { |
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2768 Klass* const k = rks->pop(); |
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2769 k->follow_weak_klass_links(is_alive_closure(), &keep_alive_closure); |
0 | 2770 } |
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2771 |
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2772 cm->follow_marking_stacks(); |
0 | 2773 } |
2774 } | |
2775 | |
2776 void | |
2777 PSParallelCompact::revisit_weak_klass_link(ParCompactionManager* cm, Klass* k) { | |
2778 cm->revisit_klass_stack()->push(k); | |
2779 } | |
2780 | |
941 | 2781 void PSParallelCompact::revisit_mdo(ParCompactionManager* cm, DataLayout* p) { |
2782 cm->revisit_mdo_stack()->push(p); | |
2783 } | |
2784 | |
2785 void PSParallelCompact::follow_mdo_weak_refs() { | |
2786 // All strongly reachable oops have been marked at this point; | |
2787 // we can visit and clear any weak references from MDO's which | |
2788 // we memoized during the strong marking phase. | |
2789 if (PrintRevisitStats) { | |
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2790 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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2791 SystemDictionary::number_of_classes()); |
941 | 2792 } |
2793 for (uint i = 0; i < ParallelGCThreads + 1; i++) { | |
2794 ParCompactionManager* cm = ParCompactionManager::manager_array(i); | |
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2795 Stack<DataLayout*>* rms = cm->revisit_mdo_stack(); |
941 | 2796 if (PrintRevisitStats) { |
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2797 gclog_or_tty->print_cr("Revisit MDO stack[%u] size = " SIZE_FORMAT, |
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2798 i, rms->size()); |
941 | 2799 } |
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2800 while (!rms->is_empty()) { |
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2801 rms->pop()->follow_weak_refs(is_alive_closure()); |
941 | 2802 } |
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2803 |
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2804 cm->follow_marking_stacks(); |
941 | 2805 } |
2806 } | |
2807 | |
2808 | |
0 | 2809 #ifdef VALIDATE_MARK_SWEEP |
2810 | |
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2811 void PSParallelCompact::track_adjusted_pointer(void* p, bool isroot) { |
0 | 2812 if (!ValidateMarkSweep) |
2813 return; | |
2814 | |
2815 if (!isroot) { | |
2816 if (_pointer_tracking) { | |
2817 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
2818 _adjusted_pointers->remove(p); | |
2819 } | |
2820 } else { | |
2821 ptrdiff_t index = _root_refs_stack->find(p); | |
2822 if (index != -1) { | |
2823 int l = _root_refs_stack->length(); | |
2824 if (l > 0 && l - 1 != index) { | |
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2825 void* last = _root_refs_stack->pop(); |
0 | 2826 assert(last != p, "should be different"); |
2827 _root_refs_stack->at_put(index, last); | |
2828 } else { | |
2829 _root_refs_stack->remove(p); | |
2830 } | |
2831 } | |
2832 } | |
2833 } | |
2834 | |
2835 | |
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2836 void PSParallelCompact::check_adjust_pointer(void* p) { |
0 | 2837 _adjusted_pointers->push(p); |
2838 } | |
2839 | |
2840 | |
2841 class AdjusterTracker: public OopClosure { | |
2842 public: | |
2843 AdjusterTracker() {}; | |
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2844 void do_oop(oop* o) { PSParallelCompact::check_adjust_pointer(o); } |
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2845 void do_oop(narrowOop* o) { PSParallelCompact::check_adjust_pointer(o); } |
0 | 2846 }; |
2847 | |
2848 | |
2849 void PSParallelCompact::track_interior_pointers(oop obj) { | |
2850 if (ValidateMarkSweep) { | |
2851 _adjusted_pointers->clear(); | |
2852 _pointer_tracking = true; | |
2853 | |
2854 AdjusterTracker checker; | |
2855 obj->oop_iterate(&checker); | |
2856 } | |
2857 } | |
2858 | |
2859 | |
2860 void PSParallelCompact::check_interior_pointers() { | |
2861 if (ValidateMarkSweep) { | |
2862 _pointer_tracking = false; | |
2863 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
2864 } | |
2865 } | |
2866 | |
2867 | |
2868 void PSParallelCompact::reset_live_oop_tracking(bool at_perm) { | |
2869 if (ValidateMarkSweep) { | |
2870 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
2871 _live_oops_index = at_perm ? _live_oops_index_at_perm : 0; | |
2872 } | |
2873 } | |
2874 | |
2875 | |
2876 void PSParallelCompact::register_live_oop(oop p, size_t size) { | |
2877 if (ValidateMarkSweep) { | |
2878 _live_oops->push(p); | |
2879 _live_oops_size->push(size); | |
2880 _live_oops_index++; | |
2881 } | |
2882 } | |
2883 | |
2884 void PSParallelCompact::validate_live_oop(oop p, size_t size) { | |
2885 if (ValidateMarkSweep) { | |
2886 oop obj = _live_oops->at((int)_live_oops_index); | |
2887 guarantee(obj == p, "should be the same object"); | |
2888 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
2889 _live_oops_index++; | |
2890 } | |
2891 } | |
2892 | |
2893 void PSParallelCompact::live_oop_moved_to(HeapWord* q, size_t size, | |
2894 HeapWord* compaction_top) { | |
2895 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
2896 "should be moved to forwarded location"); | |
2897 if (ValidateMarkSweep) { | |
2898 PSParallelCompact::validate_live_oop(oop(q), size); | |
2899 _live_oops_moved_to->push(oop(compaction_top)); | |
2900 } | |
2901 if (RecordMarkSweepCompaction) { | |
2902 _cur_gc_live_oops->push(q); | |
2903 _cur_gc_live_oops_moved_to->push(compaction_top); | |
2904 _cur_gc_live_oops_size->push(size); | |
2905 } | |
2906 } | |
2907 | |
2908 | |
2909 void PSParallelCompact::compaction_complete() { | |
2910 if (RecordMarkSweepCompaction) { | |
2911 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
2912 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
2913 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
2914 | |
2915 _cur_gc_live_oops = _last_gc_live_oops; | |
2916 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
2917 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
2918 _last_gc_live_oops = _tmp_live_oops; | |
2919 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
2920 _last_gc_live_oops_size = _tmp_live_oops_size; | |
2921 } | |
2922 } | |
2923 | |
2924 | |
2925 void PSParallelCompact::print_new_location_of_heap_address(HeapWord* q) { | |
2926 if (!RecordMarkSweepCompaction) { | |
2927 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
2928 return; | |
2929 } | |
2930 | |
2931 if (_last_gc_live_oops == NULL) { | |
2932 tty->print_cr("No compaction information gathered yet"); | |
2933 return; | |
2934 } | |
2935 | |
2936 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
2937 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
2938 size_t sz = _last_gc_live_oops_size->at(i); | |
2939 if (old_oop <= q && q < (old_oop + sz)) { | |
2940 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
2941 size_t offset = (q - old_oop); | |
2942 tty->print_cr("Address " PTR_FORMAT, q); | |
2943 tty->print_cr(" Was in oop " PTR_FORMAT ", size %d, at offset %d", old_oop, sz, offset); | |
2944 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); | |
2945 return; | |
2946 } | |
2947 } | |
2948 | |
2949 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
2950 } | |
2951 #endif //VALIDATE_MARK_SWEEP | |
2952 | |
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2953 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2954 void |
2955 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2956 SpaceId space_id, | |
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2957 size_t beg_region, |
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2958 size_t end_region) { |
0 | 2959 ParallelCompactData& sd = summary_data(); |
2960 ParMarkBitMap* const mbm = mark_bitmap(); | |
2961 | |
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2962 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2963 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2964 assert(beg_region <= end_region, "bad region range"); |
0 | 2965 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2966 | |
2967 #ifdef ASSERT | |
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2968 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2969 // filled. |
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2970 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2971 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2972 } |
2973 #endif // #ifdef ASSERT | |
2974 | |
2975 if (beg_addr != space(space_id)->bottom()) { | |
2976 // Find the first live object or block of dead space that *starts* in this | |
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2977 // range of regions. If a partial object crosses onto the region, skip it; |
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2978 // it will be marked for 'deferred update' when the object head is |
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2979 // processed. If dead space crosses onto the region, it is also skipped; it |
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2980 // will be filled when the prior region is processed. If neither of those |
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2981 // apply, the first word in the region is the start of a live object or dead |
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2982 // space. |
0 | 2983 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2984 const RegionData* const cp = sd.region(beg_region); |
0 | 2985 if (cp->partial_obj_size() != 0) { |
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2986 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2987 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2988 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2989 } | |
2990 } | |
2991 | |
2992 if (beg_addr < end_addr) { | |
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2993 // A live object or block of dead space starts in this range of Regions. |
0 | 2994 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2995 | |
2996 // Create closures and iterate. | |
2997 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2998 FillClosure fill_closure(cm, space_id); | |
2999 ParMarkBitMap::IterationStatus status; | |
3000 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
3001 dense_prefix_end); | |
3002 if (status == ParMarkBitMap::incomplete) { | |
3003 update_closure.do_addr(update_closure.source()); | |
3004 } | |
3005 } | |
3006 | |
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3007 // Mark the regions as filled. |
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3008 RegionData* const beg_cp = sd.region(beg_region); |
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3009 RegionData* const end_cp = sd.region(end_region); |
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3010 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 3011 cp->set_completed(); |
3012 } | |
3013 } | |
3014 | |
3015 // Return the SpaceId for the space containing addr. If addr is not in the | |
3016 // heap, last_space_id is returned. In debug mode it expects the address to be | |
3017 // in the heap and asserts such. | |
3018 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
3019 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
3020 | |
3021 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
3022 if (_space_info[id].space()->contains(addr)) { | |
3023 return SpaceId(id); | |
3024 } | |
3025 } | |
3026 | |
3027 assert(false, "no space contains the addr"); | |
3028 return last_space_id; | |
3029 } | |
3030 | |
3031 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
3032 SpaceId id) { | |
3033 assert(id < last_space_id, "bad space id"); | |
3034 | |
3035 ParallelCompactData& sd = summary_data(); | |
3036 const SpaceInfo* const space_info = _space_info + id; | |
3037 ObjectStartArray* const start_array = space_info->start_array(); | |
3038 | |
3039 const MutableSpace* const space = space_info->space(); | |
3040 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
3041 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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3042 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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3043 |
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3044 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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3045 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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3046 const RegionData* cur_region; |
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3047 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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|
3048 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 3049 if (addr != NULL) { |
3050 if (start_array != NULL) { | |
3051 start_array->allocate_block(addr); | |
3052 } | |
3053 oop(addr)->update_contents(cm); | |
3054 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
3055 } | |
3056 } | |
3057 } | |
3058 | |
3059 // Skip over count live words starting from beg, and return the address of the | |
3060 // next live word. Unless marked, the word corresponding to beg is assumed to | |
3061 // be dead. Callers must either ensure beg does not correspond to the middle of | |
3062 // an object, or account for those live words in some other way. Callers must | |
3063 // also ensure that there are enough live words in the range [beg, end) to skip. | |
3064 HeapWord* | |
3065 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
3066 { | |
3067 assert(count > 0, "sanity"); | |
3068 | |
3069 ParMarkBitMap* m = mark_bitmap(); | |
3070 idx_t bits_to_skip = m->words_to_bits(count); | |
3071 idx_t cur_beg = m->addr_to_bit(beg); | |
3072 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
3073 | |
3074 do { | |
3075 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
3076 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
3077 const size_t obj_bits = cur_end - cur_beg + 1; | |
3078 if (obj_bits > bits_to_skip) { | |
3079 return m->bit_to_addr(cur_beg + bits_to_skip); | |
3080 } | |
3081 bits_to_skip -= obj_bits; | |
3082 cur_beg = cur_end + 1; | |
3083 } while (bits_to_skip > 0); | |
3084 | |
3085 // Skipping the desired number of words landed just past the end of an object. | |
3086 // Find the start of the next object. | |
3087 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
3088 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
3089 return m->bit_to_addr(cur_beg); | |
3090 } | |
3091 | |
482
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3092 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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3093 SpaceId src_space_id, |
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3094 size_t src_region_idx) |
0 | 3095 { |
482
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3096 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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3097 |
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3098 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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3099 if (split_info.dest_region_addr() == dest_addr) { |
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3100 // The partial object ending at the split point contains the first word to |
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3101 // be copied to dest_addr. |
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3102 return split_info.first_src_addr(); |
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3103 } |
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3104 |
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3105 const ParallelCompactData& sd = summary_data(); |
0 | 3106 ParMarkBitMap* const bitmap = mark_bitmap(); |
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3107 const size_t RegionSize = ParallelCompactData::RegionSize; |
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3108 |
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3109 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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3110 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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3111 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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3112 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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3113 |
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3114 assert(dest_addr >= src_region_destination, "wrong src region"); |
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3115 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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3116 |
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3117 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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3118 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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3119 |
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3120 HeapWord* addr = src_region_beg; |
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3121 if (dest_addr == src_region_destination) { |
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3122 // Return the first live word in the source region. |
0 | 3123 if (partial_obj_size == 0) { |
375
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3124 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3125 assert(addr < src_region_end, "no objects start in src region"); |
0 | 3126 } |
3127 return addr; | |
3128 } | |
3129 | |
3130 // Must skip some live data. | |
375
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3131 size_t words_to_skip = dest_addr - src_region_destination; |
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3132 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 3133 |
3134 if (partial_obj_size >= words_to_skip) { | |
3135 // All the live words to skip are part of the partial object. | |
3136 addr += words_to_skip; | |
3137 if (partial_obj_size == words_to_skip) { | |
3138 // Find the first live word past the partial object. | |
375
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3139 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3140 assert(addr < src_region_end, "wrong src region"); |
0 | 3141 } |
3142 return addr; | |
3143 } | |
3144 | |
3145 // Skip over the partial object (if any). | |
3146 if (partial_obj_size != 0) { | |
3147 words_to_skip -= partial_obj_size; | |
3148 addr += partial_obj_size; | |
3149 } | |
3150 | |
375
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3151 // Skip over live words due to objects that start in the region. |
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3152 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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3153 assert(addr < src_region_end, "wrong src region"); |
0 | 3154 return addr; |
3155 } | |
3156 | |
3157 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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3158 SpaceId src_space_id, |
375
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3159 size_t beg_region, |
0 | 3160 HeapWord* end_addr) |
3161 { | |
3162 ParallelCompactData& sd = summary_data(); | |
495
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3163 |
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3164 #ifdef ASSERT |
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3165 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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3166 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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3167 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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3168 "src_space_id does not match beg_addr"); |
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3169 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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3170 "src_space_id does not match end_addr"); |
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3171 #endif // #ifdef ASSERT |
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3172 |
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3173 RegionData* const beg = sd.region(beg_region); |
495
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3174 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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3175 |
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3176 // Regions up to new_top() are enqueued if they become available. |
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3177 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3178 RegionData* const enqueue_end = |
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3179 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3180 |
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3181 for (RegionData* cur = beg; cur < end; ++cur) { |
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3182 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3183 cur->decrement_destination_count(); |
495
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3184 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 3185 cm->push_region(sd.region(cur)); |
0 | 3186 } |
3187 } | |
3188 } | |
3189 | |
375
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3190 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3191 SpaceId& src_space_id, |
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3192 HeapWord*& src_space_top, |
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3193 HeapWord* end_addr) |
0 | 3194 { |
375
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3195 typedef ParallelCompactData::RegionData RegionData; |
0 | 3196 |
3197 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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3198 const size_t region_size = ParallelCompactData::RegionSize; |
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3199 |
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3200 size_t src_region_idx = 0; |
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3201 |
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3202 // Skip empty regions (if any) up to the top of the space. |
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3203 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3204 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3205 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3206 const RegionData* const top_region_ptr = |
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3207 sd.addr_to_region_ptr(top_aligned_up); |
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3208 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3209 ++src_region_ptr; |
0 | 3210 } |
3211 | |
375
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3212 if (src_region_ptr < top_region_ptr) { |
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3213 // The next source region is in the current space. Update src_region_idx |
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3214 // and the source address to match src_region_ptr. |
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3215 src_region_idx = sd.region(src_region_ptr); |
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3216 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3217 if (src_region_addr > closure.source()) { |
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3218 closure.set_source(src_region_addr); |
0 | 3219 } |
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3220 return src_region_idx; |
0 | 3221 } |
3222 | |
375
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3223 // Switch to a new source space and find the first non-empty region. |
0 | 3224 unsigned int space_id = src_space_id + 1; |
3225 assert(space_id < last_space_id, "not enough spaces"); | |
3226 | |
3227 HeapWord* const destination = closure.destination(); | |
3228 | |
3229 do { | |
3230 MutableSpace* space = _space_info[space_id].space(); | |
3231 HeapWord* const bottom = space->bottom(); | |
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3232 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3233 |
3234 // Iterate over the spaces that do not compact into themselves. | |
3235 if (bottom_cp->destination() != bottom) { | |
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3236 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3237 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3238 |
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3239 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3240 if (src_cp->live_obj_size() > 0) { |
3241 // Found it. | |
3242 assert(src_cp->destination() == destination, | |
3243 "first live obj in the space must match the destination"); | |
3244 assert(src_cp->partial_obj_size() == 0, | |
3245 "a space cannot begin with a partial obj"); | |
3246 | |
3247 src_space_id = SpaceId(space_id); | |
3248 src_space_top = space->top(); | |
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3249 const size_t src_region_idx = sd.region(src_cp); |
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3250 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3251 return src_region_idx; |
0 | 3252 } else { |
3253 assert(src_cp->data_size() == 0, "sanity"); | |
3254 } | |
3255 } | |
3256 } | |
3257 } while (++space_id < last_space_id); | |
3258 | |
375
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3259 assert(false, "no source region was found"); |
0 | 3260 return 0; |
3261 } | |
3262 | |
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3263 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3264 { |
3265 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
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3266 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3267 ParMarkBitMap* const bitmap = mark_bitmap(); |
3268 ParallelCompactData& sd = summary_data(); | |
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3269 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3270 |
3271 // Get the items needed to construct the closure. | |
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3272 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3273 SpaceId dest_space_id = space_id(dest_addr); |
3274 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3275 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3276 assert(dest_addr < new_top, "sanity"); | |
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3277 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3278 |
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3279 // Get the source region and related info. |
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3280 size_t src_region_idx = region_ptr->source_region(); |
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3281 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3282 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3283 | |
3284 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3285 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
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3286 |
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3287 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3288 // destination count is not decremented when a region is copied to itself). |
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3289 if (src_region_idx == region_idx) { |
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3290 src_region_idx += 1; |
0 | 3291 } |
3292 | |
3293 if (bitmap->is_unmarked(closure.source())) { | |
3294 // The first source word is in the middle of an object; copy the remainder | |
3295 // of the object or as much as will fit. The fact that pointer updates were | |
3296 // deferred will be noted when the object header is processed. | |
3297 HeapWord* const old_src_addr = closure.source(); | |
3298 closure.copy_partial_obj(); | |
3299 if (closure.is_full()) { | |
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3300 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3301 closure.source()); |
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3302 region_ptr->set_deferred_obj_addr(NULL); |
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3303 region_ptr->set_completed(); |
0 | 3304 return; |
3305 } | |
3306 | |
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3307 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3308 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3309 // The partial object was copied from more than one source region. |
495
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3310 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3311 |
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3312 // Move to the next source region, possibly switching spaces as well. All |
0 | 3313 // args except end_addr may be modified. |
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3314 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3315 end_addr); |
0 | 3316 } |
3317 } | |
3318 | |
3319 do { | |
3320 HeapWord* const cur_addr = closure.source(); | |
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3321 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3322 src_space_top); |
3323 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3324 | |
3325 if (status == ParMarkBitMap::incomplete) { | |
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3326 // The last obj that starts in the source region does not end in the |
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3327 // region. |
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3328 assert(closure.source() < end_addr, "sanity"); |
0 | 3329 HeapWord* const obj_beg = closure.source(); |
3330 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3331 src_space_top); | |
3332 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3333 if (obj_end < range_end) { | |
3334 // The end was found; the entire object will fit. | |
3335 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3336 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3337 } else { | |
3338 // The end was not found; the object will not fit. | |
3339 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3340 status = ParMarkBitMap::would_overflow; | |
3341 } | |
3342 } | |
3343 | |
3344 if (status == ParMarkBitMap::would_overflow) { | |
3345 // The last object did not fit. Note that interior oop updates were | |
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3346 // deferred, then copy enough of the object to fill the region. |
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3347 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3348 status = closure.copy_until_full(); // copies from closure.source() |
3349 | |
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3350 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3351 closure.source()); |
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3352 region_ptr->set_completed(); |
0 | 3353 return; |
3354 } | |
3355 | |
3356 if (status == ParMarkBitMap::full) { | |
495
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3357 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3358 closure.source()); |
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3359 region_ptr->set_deferred_obj_addr(NULL); |
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3360 region_ptr->set_completed(); |
0 | 3361 return; |
3362 } | |
3363 | |
495
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3364 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3365 |
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3366 // Move to the next source region, possibly switching spaces as well. All |
0 | 3367 // args except end_addr may be modified. |
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3368 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3369 end_addr); |
0 | 3370 } while (true); |
3371 } | |
3372 | |
3373 void | |
3374 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3375 const MutableSpace* sp = space(space_id); | |
3376 if (sp->is_empty()) { | |
3377 return; | |
3378 } | |
3379 | |
3380 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3381 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3382 HeapWord* const dp_addr = dense_prefix(space_id); | |
3383 HeapWord* beg_addr = sp->bottom(); | |
3384 HeapWord* end_addr = sp->top(); | |
3385 | |
3386 #ifdef ASSERT | |
3387 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3388 if (cm->should_verify_only()) { | |
3389 VerifyUpdateClosure verify_update(cm, sp); | |
3390 bitmap->iterate(&verify_update, beg_addr, end_addr); | |
3391 return; | |
3392 } | |
3393 | |
3394 if (cm->should_reset_only()) { | |
3395 ResetObjectsClosure reset_objects(cm); | |
3396 bitmap->iterate(&reset_objects, beg_addr, end_addr); | |
3397 return; | |
3398 } | |
3399 #endif | |
3400 | |
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3401 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3402 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3403 if (beg_region < dp_region) { |
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3404 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3405 } |
3406 | |
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3407 // The destination of the first live object that starts in the region is one |
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3408 // past the end of the partial object entering the region (if any). |
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3409 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3410 HeapWord* const new_top = _space_info[space_id].new_top(); |
3411 assert(new_top >= dest_addr, "bad new_top value"); | |
3412 const size_t words = pointer_delta(new_top, dest_addr); | |
3413 | |
3414 if (words > 0) { | |
3415 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3416 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3417 | |
3418 ParMarkBitMap::IterationStatus status; | |
3419 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3420 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3421 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3422 "live objects skipped because closure is full"); | |
3423 } | |
3424 } | |
3425 | |
3426 jlong PSParallelCompact::millis_since_last_gc() { | |
3427 jlong ret_val = os::javaTimeMillis() - _time_of_last_gc; | |
3428 // XXX See note in genCollectedHeap::millis_since_last_gc(). | |
3429 if (ret_val < 0) { | |
3430 NOT_PRODUCT(warning("time warp: %d", ret_val);) | |
3431 return 0; | |
3432 } | |
3433 return ret_val; | |
3434 } | |
3435 | |
3436 void PSParallelCompact::reset_millis_since_last_gc() { | |
3437 _time_of_last_gc = os::javaTimeMillis(); | |
3438 } | |
3439 | |
3440 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3441 { | |
3442 if (source() != destination()) { | |
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3443 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3444 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3445 } | |
3446 update_state(words_remaining()); | |
3447 assert(is_full(), "sanity"); | |
3448 return ParMarkBitMap::full; | |
3449 } | |
3450 | |
3451 void MoveAndUpdateClosure::copy_partial_obj() | |
3452 { | |
3453 size_t words = words_remaining(); | |
3454 | |
3455 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3456 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3457 if (end_addr < range_end) { | |
3458 words = bitmap()->obj_size(source(), end_addr); | |
3459 } | |
3460 | |
3461 // This test is necessary; if omitted, the pointer updates to a partial object | |
3462 // that crosses the dense prefix boundary could be overwritten. | |
3463 if (source() != destination()) { | |
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3464 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3465 Copy::aligned_conjoint_words(source(), destination(), words); |
3466 } | |
3467 update_state(words); | |
3468 } | |
3469 | |
3470 ParMarkBitMapClosure::IterationStatus | |
3471 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3472 assert(destination() != NULL, "sanity"); | |
3473 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3474 | |
3475 _source = addr; | |
3476 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3477 destination(), "wrong destination"); | |
3478 | |
3479 if (words > words_remaining()) { | |
3480 return ParMarkBitMap::would_overflow; | |
3481 } | |
3482 | |
3483 // The start_array must be updated even if the object is not moving. | |
3484 if (_start_array != NULL) { | |
3485 _start_array->allocate_block(destination()); | |
3486 } | |
3487 | |
3488 if (destination() != source()) { | |
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3489 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3490 Copy::aligned_conjoint_words(source(), destination(), words); |
3491 } | |
3492 | |
3493 oop moved_oop = (oop) destination(); | |
3494 moved_oop->update_contents(compaction_manager()); | |
3495 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3496 | |
3497 update_state(words); | |
3498 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3499 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3500 } | |
3501 | |
3502 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3503 ParCompactionManager* cm, | |
3504 PSParallelCompact::SpaceId space_id) : | |
3505 ParMarkBitMapClosure(mbm, cm), | |
3506 _space_id(space_id), | |
3507 _start_array(PSParallelCompact::start_array(space_id)) | |
3508 { | |
3509 } | |
3510 | |
3511 // Updates the references in the object to their new values. | |
3512 ParMarkBitMapClosure::IterationStatus | |
3513 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3514 do_addr(addr); | |
3515 return ParMarkBitMap::incomplete; | |
3516 } | |
3517 | |
3518 // Verify the new location using the forwarding pointer | |
3519 // from MarkSweep::mark_sweep_phase2(). Set the mark_word | |
3520 // to the initial value. | |
3521 ParMarkBitMapClosure::IterationStatus | |
3522 PSParallelCompact::VerifyUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3523 // The second arg (words) is not used. | |
3524 oop obj = (oop) addr; | |
3525 HeapWord* forwarding_ptr = (HeapWord*) obj->mark()->decode_pointer(); | |
3526 HeapWord* new_pointer = summary_data().calc_new_pointer(obj); | |
3527 if (forwarding_ptr == NULL) { | |
3528 // The object is dead or not moving. | |
3529 assert(bitmap()->is_unmarked(obj) || (new_pointer == (HeapWord*) obj), | |
3530 "Object liveness is wrong."); | |
3531 return ParMarkBitMap::incomplete; | |
3532 } | |
3533 assert(UseParallelOldGCDensePrefix || | |
3534 (HeapMaximumCompactionInterval > 1) || | |
3535 (MarkSweepAlwaysCompactCount > 1) || | |
3536 (forwarding_ptr == new_pointer), | |
3537 "Calculation of new location is incorrect"); | |
3538 return ParMarkBitMap::incomplete; | |
3539 } | |
3540 | |
3541 // Reset objects modified for debug checking. | |
3542 ParMarkBitMapClosure::IterationStatus | |
3543 PSParallelCompact::ResetObjectsClosure::do_addr(HeapWord* addr, size_t words) { | |
3544 // The second arg (words) is not used. | |
3545 oop obj = (oop) addr; | |
3546 obj->init_mark(); | |
3547 return ParMarkBitMap::incomplete; | |
3548 } | |
3549 | |
3550 // Prepare for compaction. This method is executed once | |
3551 // (i.e., by a single thread) before compaction. | |
3552 // Save the updated location of the intArrayKlassObj for | |
3553 // filling holes in the dense prefix. | |
3554 void PSParallelCompact::compact_prologue() { | |
3555 _updated_int_array_klass_obj = (klassOop) | |
3556 summary_data().calc_new_pointer(Universe::intArrayKlassObj()); | |
3557 } | |
3558 |