Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | d2a62e0f25eb |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
32 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
33 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
34 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" | |
35 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
36 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
37 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
38 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
39 #include "gc_implementation/parallelScavenge/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" | |
6197 | 56 #include "services/memTracker.hpp" |
1972 | 57 #include "utilities/events.hpp" |
58 #include "utilities/stack.inline.hpp" | |
0 | 59 |
60 #include <math.h> | |
61 | |
62 // All sizes are in HeapWords. | |
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63 const size_t ParallelCompactData::Log2RegionSize = 9; // 512 words |
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64 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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65 const size_t ParallelCompactData::RegionSizeBytes = |
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66 RegionSize << LogHeapWordSize; |
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67 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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68 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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69 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
0 | 70 |
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71 const ParallelCompactData::RegionData::region_sz_t |
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72 ParallelCompactData::RegionData::dc_shift = 27; |
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73 |
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74 const ParallelCompactData::RegionData::region_sz_t |
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75 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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76 |
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77 const ParallelCompactData::RegionData::region_sz_t |
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78 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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79 |
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80 const ParallelCompactData::RegionData::region_sz_t |
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81 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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82 |
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83 const ParallelCompactData::RegionData::region_sz_t |
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84 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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85 |
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86 const ParallelCompactData::RegionData::region_sz_t |
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87 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 88 |
89 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
90 bool PSParallelCompact::_print_phases = false; | |
91 | |
92 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
93 klassOop PSParallelCompact::_updated_int_array_klass_obj = NULL; | |
94 | |
95 double PSParallelCompact::_dwl_mean; | |
96 double PSParallelCompact::_dwl_std_dev; | |
97 double PSParallelCompact::_dwl_first_term; | |
98 double PSParallelCompact::_dwl_adjustment; | |
99 #ifdef ASSERT | |
100 bool PSParallelCompact::_dwl_initialized = false; | |
101 #endif // #ifdef ASSERT | |
102 | |
103 #ifdef VALIDATE_MARK_SWEEP | |
113
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104 GrowableArray<void*>* PSParallelCompact::_root_refs_stack = NULL; |
0 | 105 GrowableArray<oop> * PSParallelCompact::_live_oops = NULL; |
106 GrowableArray<oop> * PSParallelCompact::_live_oops_moved_to = NULL; | |
107 GrowableArray<size_t>* PSParallelCompact::_live_oops_size = NULL; | |
108 size_t PSParallelCompact::_live_oops_index = 0; | |
109 size_t PSParallelCompact::_live_oops_index_at_perm = 0; | |
113
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110 GrowableArray<void*>* PSParallelCompact::_other_refs_stack = NULL; |
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111 GrowableArray<void*>* PSParallelCompact::_adjusted_pointers = NULL; |
0 | 112 bool PSParallelCompact::_pointer_tracking = false; |
113 bool PSParallelCompact::_root_tracking = true; | |
114 | |
115 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops = NULL; | |
116 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops_moved_to = NULL; | |
117 GrowableArray<size_t> * PSParallelCompact::_cur_gc_live_oops_size = NULL; | |
118 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops = NULL; | |
119 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops_moved_to = NULL; | |
120 GrowableArray<size_t> * PSParallelCompact::_last_gc_live_oops_size = NULL; | |
121 #endif | |
122 | |
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123 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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124 HeapWord* destination) |
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125 { |
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126 assert(src_region_idx != 0, "invalid src_region_idx"); |
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127 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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128 assert(destination != NULL, "invalid destination argument"); |
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129 |
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130 _src_region_idx = src_region_idx; |
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131 _partial_obj_size = partial_obj_size; |
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132 _destination = destination; |
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133 |
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134 // These fields may not be updated below, so make sure they're clear. |
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135 assert(_dest_region_addr == NULL, "should have been cleared"); |
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136 assert(_first_src_addr == NULL, "should have been cleared"); |
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137 |
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138 // Determine the number of destination regions for the partial object. |
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139 HeapWord* const last_word = destination + partial_obj_size - 1; |
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140 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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141 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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142 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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143 |
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144 if (beg_region_addr == end_region_addr) { |
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145 // One destination region. |
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146 _destination_count = 1; |
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147 if (end_region_addr == destination) { |
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148 // The destination falls on a region boundary, thus the first word of the |
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149 // partial object will be the first word copied to the destination region. |
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150 _dest_region_addr = end_region_addr; |
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151 _first_src_addr = sd.region_to_addr(src_region_idx); |
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152 } |
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153 } else { |
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154 // Two destination regions. When copied, the partial object will cross a |
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155 // destination region boundary, so a word somewhere within the partial |
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156 // object will be the first word copied to the second destination region. |
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157 _destination_count = 2; |
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158 _dest_region_addr = end_region_addr; |
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159 const size_t ofs = pointer_delta(end_region_addr, destination); |
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160 assert(ofs < _partial_obj_size, "sanity"); |
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161 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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162 } |
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163 } |
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164 |
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165 void SplitInfo::clear() |
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166 { |
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167 _src_region_idx = 0; |
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168 _partial_obj_size = 0; |
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169 _destination = NULL; |
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170 _destination_count = 0; |
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171 _dest_region_addr = NULL; |
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172 _first_src_addr = NULL; |
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173 assert(!is_valid(), "sanity"); |
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174 } |
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175 |
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176 #ifdef ASSERT |
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177 void SplitInfo::verify_clear() |
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178 { |
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179 assert(_src_region_idx == 0, "not clear"); |
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180 assert(_partial_obj_size == 0, "not clear"); |
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181 assert(_destination == NULL, "not clear"); |
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182 assert(_destination_count == 0, "not clear"); |
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183 assert(_dest_region_addr == NULL, "not clear"); |
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184 assert(_first_src_addr == NULL, "not clear"); |
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185 } |
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186 #endif // #ifdef ASSERT |
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187 |
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188 |
0 | 189 #ifndef PRODUCT |
190 const char* PSParallelCompact::space_names[] = { | |
191 "perm", "old ", "eden", "from", "to " | |
192 }; | |
193 | |
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194 void PSParallelCompact::print_region_ranges() |
0 | 195 { |
196 tty->print_cr("space bottom top end new_top"); | |
197 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
198 | |
199 for (unsigned int id = 0; id < last_space_id; ++id) { | |
200 const MutableSpace* space = _space_info[id].space(); | |
201 tty->print_cr("%u %s " | |
264
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202 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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203 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 204 id, space_names[id], |
375
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205 summary_data().addr_to_region_idx(space->bottom()), |
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206 summary_data().addr_to_region_idx(space->top()), |
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207 summary_data().addr_to_region_idx(space->end()), |
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208 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 209 } |
210 } | |
211 | |
212 void | |
375
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213 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 214 { |
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215 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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216 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 217 |
218 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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219 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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220 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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221 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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222 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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223 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 224 i, c->data_location(), dci, c->destination(), |
225 c->partial_obj_size(), c->live_obj_size(), | |
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226 c->data_size(), c->source_region(), c->destination_count()); |
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227 |
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228 #undef REGION_IDX_FORMAT |
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229 #undef REGION_DATA_FORMAT |
0 | 230 } |
231 | |
232 void | |
233 print_generic_summary_data(ParallelCompactData& summary_data, | |
234 HeapWord* const beg_addr, | |
235 HeapWord* const end_addr) | |
236 { | |
237 size_t total_words = 0; | |
375
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238 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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239 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 240 HeapWord* pdest = 0; |
241 | |
242 while (i <= last) { | |
375
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243 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 244 if (c->data_size() != 0 || c->destination() != pdest) { |
375
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245 print_generic_summary_region(i, c); |
0 | 246 total_words += c->data_size(); |
247 pdest = c->destination(); | |
248 } | |
249 ++i; | |
250 } | |
251 | |
252 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
253 } | |
254 | |
255 void | |
256 print_generic_summary_data(ParallelCompactData& summary_data, | |
257 SpaceInfo* space_info) | |
258 { | |
259 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
260 const MutableSpace* space = space_info[id].space(); | |
261 print_generic_summary_data(summary_data, space->bottom(), | |
262 MAX2(space->top(), space_info[id].new_top())); | |
263 } | |
264 } | |
265 | |
266 void | |
375
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267 print_initial_summary_region(size_t i, |
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268 const ParallelCompactData::RegionData* c, |
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269 bool newline = true) |
0 | 270 { |
264
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271 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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272 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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273 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 274 i, c->destination(), |
275 c->partial_obj_size(), c->live_obj_size(), | |
375
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276 c->data_size(), c->source_region(), c->destination_count()); |
0 | 277 if (newline) tty->cr(); |
278 } | |
279 | |
280 void | |
281 print_initial_summary_data(ParallelCompactData& summary_data, | |
282 const MutableSpace* space) { | |
283 if (space->top() == space->bottom()) { | |
284 return; | |
285 } | |
286 | |
375
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287 const size_t region_size = ParallelCompactData::RegionSize; |
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288 typedef ParallelCompactData::RegionData RegionData; |
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289 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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290 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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291 const RegionData* c = summary_data.region(end_region - 1); |
0 | 292 HeapWord* end_addr = c->destination() + c->data_size(); |
293 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
294 | |
375
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295 // Print (and count) the full regions at the beginning of the space. |
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296 size_t full_region_count = 0; |
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297 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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298 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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299 print_initial_summary_region(i, summary_data.region(i)); |
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300 ++full_region_count; |
0 | 301 ++i; |
302 } | |
303 | |
375
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304 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 305 |
306 double max_reclaimed_ratio = 0.0; | |
375
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307 size_t max_reclaimed_ratio_region = 0; |
0 | 308 size_t max_dead_to_right = 0; |
309 size_t max_live_to_right = 0; | |
310 | |
375
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311 // Print the 'reclaimed ratio' for regions while there is something live in |
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312 // the region or to the right of it. The remaining regions are empty (and |
0 | 313 // uninteresting), and computing the ratio will result in division by 0. |
375
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314 while (i < end_region && live_to_right > 0) { |
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315 c = summary_data.region(i); |
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316 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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317 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 318 const size_t dead_to_right = used_to_right - live_to_right; |
319 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
320 | |
321 if (reclaimed_ratio > max_reclaimed_ratio) { | |
322 max_reclaimed_ratio = reclaimed_ratio; | |
375
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323 max_reclaimed_ratio_region = i; |
0 | 324 max_dead_to_right = dead_to_right; |
325 max_live_to_right = live_to_right; | |
326 } | |
327 | |
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328 print_initial_summary_region(i, c, false); |
264
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329 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 330 reclaimed_ratio, dead_to_right, live_to_right); |
331 | |
332 live_to_right -= c->data_size(); | |
333 ++i; | |
334 } | |
335 | |
375
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336 // Any remaining regions are empty. Print one more if there is one. |
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337 if (i < end_region) { |
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338 print_initial_summary_region(i, summary_data.region(i)); |
0 | 339 } |
340 | |
264
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341 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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342 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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343 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 344 max_live_to_right, max_reclaimed_ratio); |
345 } | |
346 | |
347 void | |
348 print_initial_summary_data(ParallelCompactData& summary_data, | |
349 SpaceInfo* space_info) { | |
350 unsigned int id = PSParallelCompact::perm_space_id; | |
351 const MutableSpace* space; | |
352 do { | |
353 space = space_info[id].space(); | |
354 print_initial_summary_data(summary_data, space); | |
355 } while (++id < PSParallelCompact::eden_space_id); | |
356 | |
357 do { | |
358 space = space_info[id].space(); | |
359 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
360 } while (++id < PSParallelCompact::last_space_id); | |
361 } | |
362 #endif // #ifndef PRODUCT | |
363 | |
364 #ifdef ASSERT | |
365 size_t add_obj_count; | |
366 size_t add_obj_size; | |
367 size_t mark_bitmap_count; | |
368 size_t mark_bitmap_size; | |
369 #endif // #ifdef ASSERT | |
370 | |
371 ParallelCompactData::ParallelCompactData() | |
372 { | |
373 _region_start = 0; | |
374 | |
375
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375 _region_vspace = 0; |
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376 _region_data = 0; |
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377 _region_count = 0; |
0 | 378 } |
379 | |
380 bool ParallelCompactData::initialize(MemRegion covered_region) | |
381 { | |
382 _region_start = covered_region.start(); | |
383 const size_t region_size = covered_region.word_size(); | |
384 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
385 | |
375
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386 assert(region_align_down(_region_start) == _region_start, |
0 | 387 "region start not aligned"); |
375
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388 assert((region_size & RegionSizeOffsetMask) == 0, |
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389 "region size not a multiple of RegionSize"); |
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390 |
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391 bool result = initialize_region_data(region_size); |
0 | 392 |
393 return result; | |
394 } | |
395 | |
396 PSVirtualSpace* | |
397 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
398 { | |
399 const size_t raw_bytes = count * element_size; | |
400 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
401 const size_t granularity = os::vm_allocation_granularity(); | |
402 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
403 | |
404 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
405 MAX2(page_sz, granularity); | |
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406 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 407 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
408 rs.size()); | |
6197 | 409 |
410 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
411 | |
0 | 412 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); |
413 if (vspace != 0) { | |
414 if (vspace->expand_by(bytes)) { | |
415 return vspace; | |
416 } | |
417 delete vspace; | |
237
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418 // Release memory reserved in the space. |
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419 rs.release(); |
0 | 420 } |
421 | |
422 return 0; | |
423 } | |
424 | |
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425 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 426 { |
375
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427 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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428 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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429 if (_region_vspace != 0) { |
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430 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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431 _region_count = count; |
0 | 432 return true; |
433 } | |
434 return false; | |
435 } | |
436 | |
437 void ParallelCompactData::clear() | |
438 { | |
375
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439 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 440 } |
441 | |
375
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442 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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443 assert(beg_region <= _region_count, "beg_region out of range"); |
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444 assert(end_region <= _region_count, "end_region out of range"); |
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445 |
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446 const size_t region_cnt = end_region - beg_region; |
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447 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 448 } |
449 | |
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450 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 451 { |
375
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452 const RegionData* cur_cp = region(region_idx); |
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453 const RegionData* const end_cp = region(region_count() - 1); |
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454 |
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455 HeapWord* result = region_to_addr(region_idx); |
0 | 456 if (cur_cp < end_cp) { |
457 do { | |
458 result += cur_cp->partial_obj_size(); | |
375
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459 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 460 } |
461 return result; | |
462 } | |
463 | |
464 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
465 { | |
466 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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467 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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468 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 469 |
470 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
471 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
472 | |
375
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473 if (beg_region == end_region) { |
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474 // All in one region. |
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475 _region_data[beg_region].add_live_obj(len); |
0 | 476 return; |
477 } | |
478 | |
375
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479 // First region. |
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480 const size_t beg_ofs = region_offset(addr); |
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481 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 482 |
483 klassOop klass = ((oop)addr)->klass(); | |
375
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484 // Middle regions--completely spanned by this object. |
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485 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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486 _region_data[region].set_partial_obj_size(RegionSize); |
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487 _region_data[region].set_partial_obj_addr(addr); |
0 | 488 } |
489 | |
375
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490 // Last region. |
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491 const size_t end_ofs = region_offset(addr + len - 1); |
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492 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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493 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 494 } |
495 | |
496 void | |
497 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
498 { | |
375
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499 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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500 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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501 |
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502 size_t cur_region = addr_to_region_idx(beg); |
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503 const size_t end_region = addr_to_region_idx(end); |
0 | 504 HeapWord* addr = beg; |
375
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505 while (cur_region < end_region) { |
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506 _region_data[cur_region].set_destination(addr); |
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507 _region_data[cur_region].set_destination_count(0); |
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508 _region_data[cur_region].set_source_region(cur_region); |
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509 _region_data[cur_region].set_data_location(addr); |
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510 |
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511 // Update live_obj_size so the region appears completely full. |
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512 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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513 _region_data[cur_region].set_live_obj_size(live_size); |
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514 |
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515 ++cur_region; |
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516 addr += RegionSize; |
0 | 517 } |
518 } | |
519 | |
482
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520 // Find the point at which a space can be split and, if necessary, record the |
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521 // split point. |
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522 // |
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523 // If the current src region (which overflowed the destination space) doesn't |
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524 // have a partial object, the split point is at the beginning of the current src |
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525 // region (an "easy" split, no extra bookkeeping required). |
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526 // |
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527 // If the current src region has a partial object, the split point is in the |
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528 // region where that partial object starts (call it the split_region). If |
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529 // split_region has a partial object, then the split point is just after that |
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530 // partial object (a "hard" split where we have to record the split data and |
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531 // zero the partial_obj_size field). With a "hard" split, we know that the |
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532 // partial_obj ends within split_region because the partial object that caused |
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533 // the overflow starts in split_region. If split_region doesn't have a partial |
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534 // obj, then the split is at the beginning of split_region (another "easy" |
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535 // split). |
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536 HeapWord* |
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537 ParallelCompactData::summarize_split_space(size_t src_region, |
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538 SplitInfo& split_info, |
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539 HeapWord* destination, |
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540 HeapWord* target_end, |
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541 HeapWord** target_next) |
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542 { |
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543 assert(destination <= target_end, "sanity"); |
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544 assert(destination + _region_data[src_region].data_size() > target_end, |
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545 "region should not fit into target space"); |
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546 assert(is_region_aligned(target_end), "sanity"); |
482
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547 |
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548 size_t split_region = src_region; |
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549 HeapWord* split_destination = destination; |
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550 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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551 |
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552 if (destination + partial_obj_size > target_end) { |
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553 // The split point is just after the partial object (if any) in the |
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554 // src_region that contains the start of the object that overflowed the |
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555 // destination space. |
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556 // |
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557 // Find the start of the "overflow" object and set split_region to the |
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558 // region containing it. |
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559 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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560 split_region = addr_to_region_idx(overflow_obj); |
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561 |
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562 // Clear the source_region field of all destination regions whose first word |
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563 // came from data after the split point (a non-null source_region field |
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564 // implies a region must be filled). |
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565 // |
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566 // An alternative to the simple loop below: clear during post_compact(), |
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567 // which uses memcpy instead of individual stores, and is easy to |
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568 // parallelize. (The downside is that it clears the entire RegionData |
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569 // object as opposed to just one field.) |
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570 // |
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571 // post_compact() would have to clear the summary data up to the highest |
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572 // address that was written during the summary phase, which would be |
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573 // |
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574 // max(top, max(new_top, clear_top)) |
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575 // |
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576 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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577 // to target_end. |
482
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578 const RegionData* const sr = region(split_region); |
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579 const size_t beg_idx = |
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580 addr_to_region_idx(region_align_up(sr->destination() + |
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581 sr->partial_obj_size())); |
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582 const size_t end_idx = addr_to_region_idx(target_end); |
482
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583 |
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584 if (TraceParallelOldGCSummaryPhase) { |
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585 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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586 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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587 beg_idx, end_idx); |
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588 } |
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589 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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590 _region_data[idx].set_source_region(0); |
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591 } |
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592 |
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593 // Set split_destination and partial_obj_size to reflect the split region. |
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594 split_destination = sr->destination(); |
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595 partial_obj_size = sr->partial_obj_size(); |
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596 } |
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597 |
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598 // The split is recorded only if a partial object extends onto the region. |
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599 if (partial_obj_size != 0) { |
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600 _region_data[split_region].set_partial_obj_size(0); |
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601 split_info.record(split_region, partial_obj_size, split_destination); |
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602 } |
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603 |
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604 // Setup the continuation addresses. |
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605 *target_next = split_destination + partial_obj_size; |
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606 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 607 |
608 if (TraceParallelOldGCSummaryPhase) { | |
482
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609 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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610 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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611 " pos=" SIZE_FORMAT, |
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612 split_type, source_next, split_region, |
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613 partial_obj_size); |
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614 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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615 " tn=" PTR_FORMAT, |
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616 split_type, split_destination, |
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617 addr_to_region_idx(split_destination), |
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618 *target_next); |
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619 |
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620 if (partial_obj_size != 0) { |
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621 HeapWord* const po_beg = split_info.destination(); |
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622 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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623 gclog_or_tty->print_cr("%s split: " |
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624 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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625 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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626 split_type, |
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627 po_beg, addr_to_region_idx(po_beg), |
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628 po_end, addr_to_region_idx(po_end)); |
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629 } |
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630 } |
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631 |
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632 return source_next; |
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633 } |
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634 |
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635 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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636 HeapWord* source_beg, HeapWord* source_end, |
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637 HeapWord** source_next, |
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638 HeapWord* target_beg, HeapWord* target_end, |
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639 HeapWord** target_next) |
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640 { |
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641 if (TraceParallelOldGCSummaryPhase) { |
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642 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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643 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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644 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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645 source_beg, source_end, source_next_val, |
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646 target_beg, target_end, *target_next); |
0 | 647 } |
648 | |
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649 size_t cur_region = addr_to_region_idx(source_beg); |
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650 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 651 |
652 HeapWord *dest_addr = target_beg; | |
375
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653 while (cur_region < end_region) { |
482
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654 // The destination must be set even if the region has no data. |
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655 _region_data[cur_region].set_destination(dest_addr); |
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656 |
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657 size_t words = _region_data[cur_region].data_size(); |
0 | 658 if (words > 0) { |
482
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659 // If cur_region does not fit entirely into the target space, find a point |
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660 // at which the source space can be 'split' so that part is copied to the |
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661 // target space and the rest is copied elsewhere. |
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662 if (dest_addr + words > target_end) { |
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663 assert(source_next != NULL, "source_next is NULL when splitting"); |
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664 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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665 target_end, target_next); |
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666 return false; |
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667 } |
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668 |
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669 // Compute the destination_count for cur_region, and if necessary, update |
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670 // source_region for a destination region. The source_region field is |
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671 // updated if cur_region is the first (left-most) region to be copied to a |
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672 // destination region. |
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673 // |
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674 // The destination_count calculation is a bit subtle. A region that has |
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675 // data that compacts into itself does not count itself as a destination. |
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676 // This maintains the invariant that a zero count means the region is |
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677 // available and can be claimed and then filled. |
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678 uint destination_count = 0; |
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679 if (split_info.is_split(cur_region)) { |
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680 // The current region has been split: the partial object will be copied |
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681 // to one destination space and the remaining data will be copied to |
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682 // another destination space. Adjust the initial destination_count and, |
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683 // if necessary, set the source_region field if the partial object will |
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684 // cross a destination region boundary. |
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685 destination_count = split_info.destination_count(); |
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686 if (destination_count == 2) { |
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687 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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688 _region_data[dest_idx].set_source_region(cur_region); |
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689 } |
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690 } |
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691 |
0 | 692 HeapWord* const last_addr = dest_addr + words - 1; |
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693 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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694 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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695 |
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696 // Initially assume that the destination regions will be the same and |
0 | 697 // adjust the value below if necessary. Under this assumption, if |
375
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698 // cur_region == dest_region_2, then cur_region will be compacted |
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699 // completely into itself. |
482
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700 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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701 if (dest_region_1 != dest_region_2) { |
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702 // Destination regions differ; adjust destination_count. |
0 | 703 destination_count += 1; |
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704 // Data from cur_region will be copied to the start of dest_region_2. |
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705 _region_data[dest_region_2].set_source_region(cur_region); |
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706 } else if (region_offset(dest_addr) == 0) { |
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707 // Data from cur_region will be copied to the start of the destination |
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708 // region. |
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709 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 710 } |
711 | |
375
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712 _region_data[cur_region].set_destination_count(destination_count); |
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713 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 714 dest_addr += words; |
715 } | |
716 | |
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717 ++cur_region; |
0 | 718 } |
719 | |
720 *target_next = dest_addr; | |
721 return true; | |
722 } | |
723 | |
724 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
725 assert(addr != NULL, "Should detect NULL oop earlier"); | |
726 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
727 #ifdef ASSERT | |
728 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
729 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
730 } | |
731 #endif | |
732 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
733 | |
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734 // Region covering the object. |
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735 size_t region_index = addr_to_region_idx(addr); |
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736 const RegionData* const region_ptr = region(region_index); |
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737 HeapWord* const region_addr = region_align_down(addr); |
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738 |
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739 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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740 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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741 |
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742 HeapWord* result = region_ptr->destination(); |
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743 |
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744 // If all the data in the region is live, then the new location of the object |
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745 // can be calculated from the destination of the region plus the offset of the |
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746 // object in the region. |
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747 if (region_ptr->data_size() == RegionSize) { |
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748 result += pointer_delta(addr, region_addr); |
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749 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 750 return result; |
751 } | |
752 | |
753 // The new location of the object is | |
375
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754 // region destination + |
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755 // size of the partial object extending onto the region + |
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756 // sizes of the live objects in the Region that are to the left of addr |
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757 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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758 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 759 |
760 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
761 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
762 | |
763 result += partial_obj_size + live_to_left; | |
495
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764 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 765 return result; |
766 } | |
767 | |
768 klassOop ParallelCompactData::calc_new_klass(klassOop old_klass) { | |
769 klassOop updated_klass; | |
770 if (PSParallelCompact::should_update_klass(old_klass)) { | |
771 updated_klass = (klassOop) calc_new_pointer(old_klass); | |
772 } else { | |
773 updated_klass = old_klass; | |
774 } | |
775 | |
776 return updated_klass; | |
777 } | |
778 | |
779 #ifdef ASSERT | |
780 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
781 { | |
782 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
783 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
784 for (const size_t* p = beg; p < end; ++p) { | |
785 assert(*p == 0, "not zero"); | |
786 } | |
787 } | |
788 | |
789 void ParallelCompactData::verify_clear() | |
790 { | |
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791 verify_clear(_region_vspace); |
0 | 792 } |
793 #endif // #ifdef ASSERT | |
794 | |
795 #ifdef NOT_PRODUCT | |
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796 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 797 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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798 return sd.region(region_index); |
0 | 799 } |
800 #endif | |
801 | |
802 elapsedTimer PSParallelCompact::_accumulated_time; | |
803 unsigned int PSParallelCompact::_total_invocations = 0; | |
804 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
805 jlong PSParallelCompact::_time_of_last_gc = 0; | |
806 CollectorCounters* PSParallelCompact::_counters = NULL; | |
807 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
808 ParallelCompactData PSParallelCompact::_summary_data; | |
809 | |
810 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
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811 |
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812 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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813 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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814 |
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815 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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816 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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817 |
0 | 818 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_root_pointer_closure(true); |
819 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure(false); | |
820 | |
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821 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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822 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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823 |
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824 void PSParallelCompact::FollowStackClosure::do_void() { _compaction_manager->follow_marking_stacks(); } |
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825 |
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826 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(_compaction_manager, p); } |
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827 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 828 |
829 void PSParallelCompact::post_initialize() { | |
830 ParallelScavengeHeap* heap = gc_heap(); | |
831 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
832 | |
833 MemRegion mr = heap->reserved_region(); | |
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834 _ref_processor = |
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835 new ReferenceProcessor(mr, // span |
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836 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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837 (int) ParallelGCThreads, // mt processing degree |
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838 true, // mt discovery |
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839 (int) ParallelGCThreads, // mt discovery degree |
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840 true, // atomic_discovery |
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841 &_is_alive_closure, // non-header is alive closure |
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842 false); // write barrier for next field updates |
0 | 843 _counters = new CollectorCounters("PSParallelCompact", 1); |
844 | |
845 // Initialize static fields in ParCompactionManager. | |
846 ParCompactionManager::initialize(mark_bitmap()); | |
847 } | |
848 | |
849 bool PSParallelCompact::initialize() { | |
850 ParallelScavengeHeap* heap = gc_heap(); | |
851 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
852 MemRegion mr = heap->reserved_region(); | |
853 | |
854 // Was the old gen get allocated successfully? | |
855 if (!heap->old_gen()->is_allocated()) { | |
856 return false; | |
857 } | |
858 | |
859 initialize_space_info(); | |
860 initialize_dead_wood_limiter(); | |
861 | |
862 if (!_mark_bitmap.initialize(mr)) { | |
863 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
864 "parallel garbage collection for the requested heap size."); | |
865 return false; | |
866 } | |
867 | |
868 if (!_summary_data.initialize(mr)) { | |
869 vm_shutdown_during_initialization("Unable to allocate tables for " | |
870 "parallel garbage collection for the requested heap size."); | |
871 return false; | |
872 } | |
873 | |
874 return true; | |
875 } | |
876 | |
877 void PSParallelCompact::initialize_space_info() | |
878 { | |
879 memset(&_space_info, 0, sizeof(_space_info)); | |
880 | |
881 ParallelScavengeHeap* heap = gc_heap(); | |
882 PSYoungGen* young_gen = heap->young_gen(); | |
883 MutableSpace* perm_space = heap->perm_gen()->object_space(); | |
884 | |
885 _space_info[perm_space_id].set_space(perm_space); | |
886 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); | |
887 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
888 _space_info[from_space_id].set_space(young_gen->from_space()); | |
889 _space_info[to_space_id].set_space(young_gen->to_space()); | |
890 | |
891 _space_info[perm_space_id].set_start_array(heap->perm_gen()->start_array()); | |
892 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
893 | |
894 _space_info[perm_space_id].set_min_dense_prefix(perm_space->top()); | |
895 if (TraceParallelOldGCDensePrefix) { | |
896 tty->print_cr("perm min_dense_prefix=" PTR_FORMAT, | |
897 _space_info[perm_space_id].min_dense_prefix()); | |
898 } | |
899 } | |
900 | |
901 void PSParallelCompact::initialize_dead_wood_limiter() | |
902 { | |
903 const size_t max = 100; | |
904 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
905 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
906 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
907 DEBUG_ONLY(_dwl_initialized = true;) | |
908 _dwl_adjustment = normal_distribution(1.0); | |
909 } | |
910 | |
911 // Simple class for storing info about the heap at the start of GC, to be used | |
912 // after GC for comparison/printing. | |
913 class PreGCValues { | |
914 public: | |
915 PreGCValues() { } | |
916 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
917 | |
918 void fill(ParallelScavengeHeap* heap) { | |
919 _heap_used = heap->used(); | |
920 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
921 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
922 _perm_gen_used = heap->perm_gen()->used_in_bytes(); | |
923 }; | |
924 | |
925 size_t heap_used() const { return _heap_used; } | |
926 size_t young_gen_used() const { return _young_gen_used; } | |
927 size_t old_gen_used() const { return _old_gen_used; } | |
928 size_t perm_gen_used() const { return _perm_gen_used; } | |
929 | |
930 private: | |
931 size_t _heap_used; | |
932 size_t _young_gen_used; | |
933 size_t _old_gen_used; | |
934 size_t _perm_gen_used; | |
935 }; | |
936 | |
937 void | |
938 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
939 { | |
940 // At this point, top is the value before GC, new_top() is the value that will | |
941 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
942 // should be marked above top. The summary data is cleared to the larger of | |
943 // top & new_top. | |
944 MutableSpace* const space = _space_info[id].space(); | |
945 HeapWord* const bot = space->bottom(); | |
946 HeapWord* const top = space->top(); | |
947 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
948 | |
949 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
950 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
951 _mark_bitmap.clear_range(beg_bit, end_bit); | |
952 | |
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953 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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954 const size_t end_region = |
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955 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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956 _summary_data.clear_range(beg_region, end_region); |
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957 |
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958 // Clear the data used to 'split' regions. |
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959 SplitInfo& split_info = _space_info[id].split_info(); |
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960 if (split_info.is_valid()) { |
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961 split_info.clear(); |
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962 } |
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963 DEBUG_ONLY(split_info.verify_clear();) |
0 | 964 } |
965 | |
966 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
967 { | |
968 // Update the from & to space pointers in space_info, since they are swapped | |
969 // at each young gen gc. Do the update unconditionally (even though a | |
970 // promotion failure does not swap spaces) because an unknown number of minor | |
971 // collections will have swapped the spaces an unknown number of times. | |
972 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
973 ParallelScavengeHeap* heap = gc_heap(); | |
974 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
975 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
976 | |
977 pre_gc_values->fill(heap); | |
978 | |
979 ParCompactionManager::reset(); | |
980 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
981 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
982 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
983 | |
984 // Increment the invocation count | |
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985 heap->increment_total_collections(true); |
0 | 986 |
987 // We need to track unique mark sweep invocations as well. | |
988 _total_invocations++; | |
989 | |
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990 heap->print_heap_before_gc(); |
0 | 991 |
992 // Fill in TLABs | |
993 heap->accumulate_statistics_all_tlabs(); | |
994 heap->ensure_parsability(true); // retire TLABs | |
995 | |
996 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
997 HandleMark hm; // Discard invalid handles created during verification | |
998 gclog_or_tty->print(" VerifyBeforeGC:"); | |
999 Universe::verify(true); | |
1000 } | |
1001 | |
1002 // Verify object start arrays | |
1003 if (VerifyObjectStartArray && | |
1004 VerifyBeforeGC) { | |
1005 heap->old_gen()->verify_object_start_array(); | |
1006 heap->perm_gen()->verify_object_start_array(); | |
1007 } | |
1008 | |
1009 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
1010 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 1011 |
1012 // Have worker threads release resources the next time they run a task. | |
1013 gc_task_manager()->release_all_resources(); | |
0 | 1014 } |
1015 | |
1016 void PSParallelCompact::post_compact() | |
1017 { | |
1018 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
1019 | |
1020 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
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1021 // Clear the marking bitmap, summary data and split info. |
0 | 1022 clear_data_covering_space(SpaceId(id)); |
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1023 // Update top(). Must be done after clearing the bitmap and summary data. |
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1024 _space_info[id].publish_new_top(); |
0 | 1025 } |
1026 | |
1027 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
1028 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
1029 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
1030 | |
1031 ParallelScavengeHeap* heap = gc_heap(); | |
1032 bool eden_empty = eden_space->is_empty(); | |
1033 if (!eden_empty) { | |
1034 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1035 heap->young_gen(), heap->old_gen()); | |
1036 } | |
1037 | |
1038 // Update heap occupancy information which is used as input to the soft ref | |
1039 // clearing policy at the next gc. | |
1040 Universe::update_heap_info_at_gc(); | |
1041 | |
1042 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1043 to_space->is_empty(); | |
1044 | |
1045 BarrierSet* bs = heap->barrier_set(); | |
1046 if (bs->is_a(BarrierSet::ModRef)) { | |
1047 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1048 MemRegion old_mr = heap->old_gen()->reserved(); | |
1049 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
1050 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
1051 | |
1052 if (young_gen_empty) { | |
1053 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
1054 } else { | |
1055 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
1056 } | |
1057 } | |
1058 | |
1059 Threads::gc_epilogue(); | |
1060 CodeCache::gc_epilogue(); | |
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1061 JvmtiExport::gc_epilogue(); |
0 | 1062 |
1063 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1064 | |
1065 ref_processor()->enqueue_discovered_references(NULL); | |
1066 | |
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1067 if (ZapUnusedHeapArea) { |
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1068 heap->gen_mangle_unused_area(); |
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1069 } |
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1070 |
0 | 1071 // Update time of last GC |
1072 reset_millis_since_last_gc(); | |
1073 } | |
1074 | |
1075 HeapWord* | |
1076 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1077 bool maximum_compaction) | |
1078 { | |
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1079 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1080 const ParallelCompactData& sd = summary_data(); |
1081 | |
1082 const MutableSpace* const space = _space_info[id].space(); | |
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1083 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1084 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1085 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1086 |
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1087 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1088 // of the dense prefix. |
1089 size_t full_count = 0; | |
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1090 const RegionData* cp; |
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1091 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1092 ++full_count; |
1093 } | |
1094 | |
1095 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1096 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1097 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1098 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1099 _maximum_compaction_gc_num = total_invocations(); | |
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1100 return sd.region_to_addr(cp); |
0 | 1101 } |
1102 | |
1103 HeapWord* const new_top = _space_info[id].new_top(); | |
1104 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1105 const size_t space_used = space->used_in_words(); | |
1106 const size_t space_capacity = space->capacity_in_words(); | |
1107 | |
1108 const double cur_density = double(space_live) / space_capacity; | |
1109 const double deadwood_density = | |
1110 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1111 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1112 | |
1113 if (TraceParallelOldGCDensePrefix) { | |
1114 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1115 cur_density, deadwood_density, deadwood_goal); | |
1116 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1117 "space_cap=" SIZE_FORMAT, | |
1118 space_live, space_used, | |
1119 space_capacity); | |
1120 } | |
1121 | |
1122 // XXX - Use binary search? | |
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1123 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1124 const RegionData* full_cp = cp; |
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1125 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1126 while (cp < end_cp) { |
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1127 HeapWord* region_destination = cp->destination(); |
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1128 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1129 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1130 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1131 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1132 sd.region(cp), region_destination, |
0 | 1133 dense_prefix, cur_deadwood); |
1134 } | |
1135 | |
1136 if (cur_deadwood >= deadwood_goal) { | |
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1137 // Found the region that has the correct amount of deadwood to the left. |
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1138 // This typically occurs after crossing a fairly sparse set of regions, so |
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1139 // iterate backwards over those sparse regions, looking for the region |
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1140 // that has the lowest density of live objects 'to the right.' |
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1141 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1142 size_t live_to_left = space_to_left - cur_deadwood; |
1143 size_t space_to_right = space_capacity - space_to_left; | |
1144 size_t live_to_right = space_live - live_to_left; | |
1145 double density_to_right = double(live_to_right) / space_to_right; | |
1146 while (cp > full_cp) { | |
1147 --cp; | |
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1148 const size_t prev_region_live_to_right = live_to_right - |
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1149 cp->data_size(); |
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1150 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1151 double prev_region_density_to_right = |
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1152 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1153 if (density_to_right <= prev_region_density_to_right) { |
0 | 1154 return dense_prefix; |
1155 } | |
1156 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1157 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1158 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1159 prev_region_density_to_right); |
0 | 1160 } |
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1161 dense_prefix -= region_size; |
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1162 live_to_right = prev_region_live_to_right; |
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1163 space_to_right = prev_region_space_to_right; |
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1164 density_to_right = prev_region_density_to_right; |
0 | 1165 } |
1166 return dense_prefix; | |
1167 } | |
1168 | |
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1169 dense_prefix += region_size; |
0 | 1170 ++cp; |
1171 } | |
1172 | |
1173 return dense_prefix; | |
1174 } | |
1175 | |
1176 #ifndef PRODUCT | |
1177 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1178 const SpaceId id, | |
1179 const bool maximum_compaction, | |
1180 HeapWord* const addr) | |
1181 { | |
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1182 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1183 RegionData* const cp = summary_data().region(region_idx); |
0 | 1184 const MutableSpace* const space = _space_info[id].space(); |
1185 HeapWord* const new_top = _space_info[id].new_top(); | |
1186 | |
1187 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1188 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1189 const size_t space_cap = space->capacity_in_words(); | |
1190 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1191 const size_t live_to_right = new_top - cp->destination(); | |
1192 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1193 | |
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1194 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1195 "spl=" SIZE_FORMAT " " |
1196 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1197 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1198 " ratio=%10.8f", | |
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1199 algorithm, addr, region_idx, |
0 | 1200 space_live, |
1201 dead_to_left, dead_to_left_pct, | |
1202 dead_to_right, live_to_right, | |
1203 double(dead_to_right) / live_to_right); | |
1204 } | |
1205 #endif // #ifndef PRODUCT | |
1206 | |
1207 // Return a fraction indicating how much of the generation can be treated as | |
1208 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1209 // based on the density of live objects in the generation to determine a limit, | |
1210 // which is then adjusted so the return value is min_percent when the density is | |
1211 // 1. | |
1212 // | |
1213 // The following table shows some return values for a different values of the | |
1214 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1215 // min_percent is 1. | |
1216 // | |
1217 // fraction allowed as dead wood | |
1218 // ----------------------------------------------------------------- | |
1219 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1220 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1221 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1222 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1223 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1224 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1225 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1226 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1227 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1228 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1229 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1230 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1231 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1232 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1233 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1234 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1235 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1236 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1237 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1238 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1239 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1240 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1241 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1242 | |
1243 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1244 { | |
1245 assert(_dwl_initialized, "uninitialized"); | |
1246 | |
1247 // The raw limit is the value of the normal distribution at x = density. | |
1248 const double raw_limit = normal_distribution(density); | |
1249 | |
1250 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1251 // | |
1252 // First subtract the adjustment value (which is simply the precomputed value | |
1253 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1254 // Then add the minimum value, so the minimum is returned when the density is | |
1255 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1256 const double min = double(min_percent) / 100.0; | |
1257 const double limit = raw_limit - _dwl_adjustment + min; | |
1258 return MAX2(limit, 0.0); | |
1259 } | |
1260 | |
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1261 ParallelCompactData::RegionData* |
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1262 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1263 const RegionData* end) |
0 | 1264 { |
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1265 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1266 ParallelCompactData& sd = summary_data(); |
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1267 size_t left = sd.region(beg); |
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1268 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1269 |
1270 // Binary search. | |
1271 while (left < right) { | |
1272 // Equivalent to (left + right) / 2, but does not overflow. | |
1273 const size_t middle = left + (right - left) / 2; | |
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1274 RegionData* const middle_ptr = sd.region(middle); |
0 | 1275 HeapWord* const dest = middle_ptr->destination(); |
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1276 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1277 assert(dest != NULL, "sanity"); |
1278 assert(dest <= addr, "must move left"); | |
1279 | |
1280 if (middle > left && dest < addr) { | |
1281 right = middle - 1; | |
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1282 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1283 left = middle + 1; |
1284 } else { | |
1285 return middle_ptr; | |
1286 } | |
1287 } | |
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1288 return sd.region(left); |
0 | 1289 } |
1290 | |
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1291 ParallelCompactData::RegionData* |
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1292 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1293 const RegionData* end, |
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1294 size_t dead_words) |
0 | 1295 { |
1296 ParallelCompactData& sd = summary_data(); | |
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1297 size_t left = sd.region(beg); |
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1298 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1299 |
1300 // Binary search. | |
1301 while (left < right) { | |
1302 // Equivalent to (left + right) / 2, but does not overflow. | |
1303 const size_t middle = left + (right - left) / 2; | |
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1304 RegionData* const middle_ptr = sd.region(middle); |
0 | 1305 HeapWord* const dest = middle_ptr->destination(); |
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1306 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1307 assert(dest != NULL, "sanity"); |
1308 assert(dest <= addr, "must move left"); | |
1309 | |
1310 const size_t dead_to_left = pointer_delta(addr, dest); | |
1311 if (middle > left && dead_to_left > dead_words) { | |
1312 right = middle - 1; | |
1313 } else if (middle < right && dead_to_left < dead_words) { | |
1314 left = middle + 1; | |
1315 } else { | |
1316 return middle_ptr; | |
1317 } | |
1318 } | |
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1319 return sd.region(left); |
0 | 1320 } |
1321 | |
1322 // The result is valid during the summary phase, after the initial summarization | |
1323 // of each space into itself, and before final summarization. | |
1324 inline double | |
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1325 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1326 HeapWord* const bottom, |
1327 HeapWord* const top, | |
1328 HeapWord* const new_top) | |
1329 { | |
1330 ParallelCompactData& sd = summary_data(); | |
1331 | |
1332 assert(cp != NULL, "sanity"); | |
1333 assert(bottom != NULL, "sanity"); | |
1334 assert(top != NULL, "sanity"); | |
1335 assert(new_top != NULL, "sanity"); | |
1336 assert(top >= new_top, "summary data problem?"); | |
1337 assert(new_top > bottom, "space is empty; should not be here"); | |
1338 assert(new_top >= cp->destination(), "sanity"); | |
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1339 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1340 |
1341 HeapWord* const destination = cp->destination(); | |
1342 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1343 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1344 const size_t compacted_region_used = pointer_delta(top, |
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1345 sd.region_to_addr(cp)); |
0 | 1346 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1347 | |
1348 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1349 return double(reclaimable) / divisor; | |
1350 } | |
1351 | |
1352 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1353 // compacted region. The address is always on a region boundary. |
0 | 1354 // |
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1355 // Completely full regions at the left are skipped, since no compaction can |
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1356 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1357 // computed, based on the density (amount live / capacity) of the generation; |
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1358 // the region with approximately that amount of dead space to the left is |
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1359 // identified as the limit region. Regions between the last completely full |
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1360 // region and the limit region are scanned and the one that has the best |
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1361 // (maximum) reclaimed_ratio() is selected. |
0 | 1362 HeapWord* |
1363 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1364 bool maximum_compaction) | |
1365 { | |
483
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1366 if (ParallelOldGCSplitALot) { |
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1367 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1368 // The value was chosen to provoke splitting a young gen space; use it. |
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1369 return _space_info[id].dense_prefix(); |
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1370 } |
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1371 } |
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1372 |
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1373 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1374 const ParallelCompactData& sd = summary_data(); |
1375 | |
1376 const MutableSpace* const space = _space_info[id].space(); | |
1377 HeapWord* const top = space->top(); | |
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1378 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1379 HeapWord* const new_top = _space_info[id].new_top(); |
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1380 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1381 HeapWord* const bottom = space->bottom(); |
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1382 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1383 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1384 const RegionData* const new_top_cp = |
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1385 sd.addr_to_region_ptr(new_top_aligned_up); |
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1386 |
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1387 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1388 // of the dense prefix. |
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1389 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1390 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1391 space->is_empty(), "no dead space allowed to the left"); |
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1392 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1393 "region must have dead space"); |
0 | 1394 |
1395 // The gc number is saved whenever a maximum compaction is done, and used to | |
1396 // determine when the maximum compaction interval has expired. This avoids | |
1397 // successive max compactions for different reasons. | |
1398 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1399 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1400 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1401 total_invocations() == HeapFirstMaximumCompactionCount; | |
1402 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1403 _maximum_compaction_gc_num = total_invocations(); | |
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1404 return sd.region_to_addr(full_cp); |
0 | 1405 } |
1406 | |
1407 const size_t space_live = pointer_delta(new_top, bottom); | |
1408 const size_t space_used = space->used_in_words(); | |
1409 const size_t space_capacity = space->capacity_in_words(); | |
1410 | |
1411 const double density = double(space_live) / double(space_capacity); | |
1412 const size_t min_percent_free = | |
1413 id == perm_space_id ? PermMarkSweepDeadRatio : MarkSweepDeadRatio; | |
1414 const double limiter = dead_wood_limiter(density, min_percent_free); | |
1415 const size_t dead_wood_max = space_used - space_live; | |
1416 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1417 dead_wood_max); | |
1418 | |
1419 if (TraceParallelOldGCDensePrefix) { | |
1420 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1421 "space_cap=" SIZE_FORMAT, | |
1422 space_live, space_used, | |
1423 space_capacity); | |
1424 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1425 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1426 density, min_percent_free, limiter, | |
1427 dead_wood_max, dead_wood_limit); | |
1428 } | |
1429 | |
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1430 // Locate the region with the desired amount of dead space to the left. |
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1431 const RegionData* const limit_cp = |
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1432 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1433 |
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1434 // Scan from the first region with dead space to the limit region and find the |
0 | 1435 // one with the best (largest) reclaimed ratio. |
1436 double best_ratio = 0.0; | |
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1437 const RegionData* best_cp = full_cp; |
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1438 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1439 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1440 if (tmp_ratio > best_ratio) { | |
1441 best_cp = cp; | |
1442 best_ratio = tmp_ratio; | |
1443 } | |
1444 } | |
1445 | |
1446 #if 0 | |
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1447 // Something to consider: if the region with the best ratio is 'close to' the |
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1448 // first region w/free space, choose the first region with free space |
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1449 // ("first-free"). The first-free region is usually near the start of the |
0 | 1450 // heap, which means we are copying most of the heap already, so copy a bit |
1451 // more to get complete compaction. | |
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1452 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1453 _maximum_compaction_gc_num = total_invocations(); |
1454 best_cp = full_cp; | |
1455 } | |
1456 #endif // #if 0 | |
1457 | |
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1458 return sd.region_to_addr(best_cp); |
0 | 1459 } |
1460 | |
483
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1461 #ifndef PRODUCT |
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1462 void |
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1463 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1464 size_t words) |
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1465 { |
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1466 if (TraceParallelOldGCSummaryPhase) { |
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1467 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1468 SIZE_FORMAT, start, start + words, words); |
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1469 } |
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1470 |
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1471 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1472 CollectedHeap::fill_with_objects(start, words); |
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1473 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1474 _mark_bitmap.mark_obj(p, words); |
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1475 _summary_data.add_obj(p, words); |
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1476 start_array->allocate_block(p); |
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1477 } |
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1478 } |
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1479 |
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1480 void |
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1481 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1482 { |
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1483 ParallelCompactData& sd = summary_data(); |
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1484 MutableSpace* space = _space_info[id].space(); |
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1485 |
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1486 // Find the source and destination start addresses. |
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1487 HeapWord* const src_addr = sd.region_align_down(start); |
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1488 HeapWord* dst_addr; |
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1489 if (src_addr < start) { |
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1490 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1491 } else if (src_addr > space->bottom()) { |
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1492 // The start (the original top() value) is aligned to a region boundary so |
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1493 // the associated region does not have a destination. Compute the |
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1494 // destination from the previous region. |
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1495 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1496 dst_addr = cp->destination() + cp->data_size(); |
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1497 } else { |
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1498 // Filling the entire space. |
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1499 dst_addr = space->bottom(); |
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1500 } |
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1501 assert(dst_addr != NULL, "sanity"); |
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1502 |
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1503 // Update the summary data. |
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1504 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1505 src_addr, space->top(), NULL, |
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1506 dst_addr, space->end(), |
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1507 _space_info[id].new_top_addr()); |
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1508 assert(result, "should not fail: bad filler object size"); |
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1509 } |
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1510 |
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1511 void |
496
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1512 PSParallelCompact::provoke_split_fill_survivor(SpaceId id) |
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1513 { |
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1514 if (total_invocations() % (ParallelOldGCSplitInterval * 3) != 0) { |
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1515 return; |
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1516 } |
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1517 |
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1518 MutableSpace* const space = _space_info[id].space(); |
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1519 if (space->is_empty()) { |
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1520 HeapWord* b = space->bottom(); |
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1521 HeapWord* t = b + space->capacity_in_words() / 2; |
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1522 space->set_top(t); |
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1523 if (ZapUnusedHeapArea) { |
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1524 space->set_top_for_allocations(); |
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1525 } |
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1526 |
1571
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1527 size_t min_size = CollectedHeap::min_fill_size(); |
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1528 size_t obj_len = min_size; |
496
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1529 while (b + obj_len <= t) { |
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1530 CollectedHeap::fill_with_object(b, obj_len); |
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1531 mark_bitmap()->mark_obj(b, obj_len); |
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1532 summary_data().add_obj(b, obj_len); |
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1533 b += obj_len; |
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1534 obj_len = (obj_len & (min_size*3)) + min_size; // 8 16 24 32 8 16 24 32 ... |
496
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1535 } |
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1536 if (b < t) { |
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1537 // The loop didn't completely fill to t (top); adjust top downward. |
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|
1538 space->set_top(b); |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
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|
1539 if (ZapUnusedHeapArea) { |
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6786188: par compact - "SplitALot" stress mode should fill to_space
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diff
changeset
|
1540 space->set_top_for_allocations(); |
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diff
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|
1541 } |
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diff
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|
1542 } |
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diff
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|
1543 |
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|
1544 HeapWord** nta = _space_info[id].new_top_addr(); |
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|
1545 bool result = summary_data().summarize(_space_info[id].split_info(), |
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|
1546 space->bottom(), space->top(), NULL, |
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|
1547 space->bottom(), space->end(), nta); |
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|
1548 assert(result, "space must fit into itself"); |
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|
1549 } |
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|
1550 } |
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495
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changeset
|
1551 |
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495
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|
1552 void |
483
0f773163217d
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|
1553 PSParallelCompact::provoke_split(bool & max_compaction) |
0f773163217d
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|
1554 { |
496
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|
1555 if (total_invocations() % ParallelOldGCSplitInterval != 0) { |
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|
1556 return; |
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|
1557 } |
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|
1558 |
483
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1559 const size_t region_size = ParallelCompactData::RegionSize; |
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1560 ParallelCompactData& sd = summary_data(); |
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|
1561 |
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1562 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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1563 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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1564 const size_t eden_live = pointer_delta(eden_space->top(), |
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1565 _space_info[eden_space_id].new_top()); |
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1566 const size_t from_live = pointer_delta(from_space->top(), |
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1567 _space_info[from_space_id].new_top()); |
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|
1568 |
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1569 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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1570 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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1571 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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1572 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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1573 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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1574 |
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|
1575 // Choose the space to split; need at least 2 regions live (or fillable). |
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1576 SpaceId id; |
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|
1577 MutableSpace* space; |
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|
1578 size_t live_words; |
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|
1579 size_t fill_words; |
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1580 if (eden_live + eden_fillable >= region_size * 2) { |
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|
1581 id = eden_space_id; |
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|
1582 space = eden_space; |
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|
1583 live_words = eden_live; |
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1584 fill_words = eden_fillable; |
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|
1585 } else if (from_live + from_fillable >= region_size * 2) { |
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|
1586 id = from_space_id; |
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changeset
|
1587 space = from_space; |
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|
1588 live_words = from_live; |
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|
1589 fill_words = from_fillable; |
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|
1590 } else { |
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|
1591 return; // Give up. |
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|
1592 } |
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|
1593 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
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|
1594 |
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|
1595 if (live_words < region_size * 2) { |
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1596 // Fill from top() to end() w/live objects of mixed sizes. |
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|
1597 HeapWord* const fill_start = space->top(); |
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|
1598 live_words += fill_words; |
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changeset
|
1599 |
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changeset
|
1600 space->set_top(fill_start + fill_words); |
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|
1601 if (ZapUnusedHeapArea) { |
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diff
changeset
|
1602 space->set_top_for_allocations(); |
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changeset
|
1603 } |
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changeset
|
1604 |
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changeset
|
1605 HeapWord* cur_addr = fill_start; |
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changeset
|
1606 while (fill_words > 0) { |
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|
1607 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1608 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1609 if (fill_words - cur_size < min_fill_size) { |
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1610 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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|
1611 } |
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changeset
|
1612 |
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|
1613 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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|
1614 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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|
1615 sd.add_obj(cur_addr, cur_size); |
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|
1616 |
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|
1617 cur_addr += cur_size; |
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|
1618 fill_words -= cur_size; |
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|
1619 } |
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changeset
|
1620 |
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changeset
|
1621 summarize_new_objects(id, fill_start); |
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|
1622 } |
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changeset
|
1623 |
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changeset
|
1624 max_compaction = false; |
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|
1625 |
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changeset
|
1626 // Manipulate the old gen so that it has room for about half of the live data |
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|
1627 // in the target young gen space (live_words / 2). |
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changeset
|
1628 id = old_space_id; |
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|
1629 space = _space_info[id].space(); |
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|
1630 const size_t free_at_end = space->free_in_words(); |
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|
1631 const size_t free_target = align_object_size(live_words / 2); |
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|
1632 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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|
1633 |
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|
1634 if (free_at_end >= free_target + min_fill_size) { |
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|
1635 // Fill space above top() and set the dense prefix so everything survives. |
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|
1636 HeapWord* const fill_start = space->top(); |
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|
1637 const size_t fill_size = free_at_end - free_target; |
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|
1638 space->set_top(space->top() + fill_size); |
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diff
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|
1639 if (ZapUnusedHeapArea) { |
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changeset
|
1640 space->set_top_for_allocations(); |
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changeset
|
1641 } |
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|
1642 fill_with_live_objects(id, fill_start, fill_size); |
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|
1643 summarize_new_objects(id, fill_start); |
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|
1644 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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|
1645 } else if (dead + free_at_end > free_target) { |
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|
1646 // Find a dense prefix that makes the right amount of space available. |
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changeset
|
1647 HeapWord* cur = sd.region_align_down(space->top()); |
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482
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changeset
|
1648 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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482
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|
1649 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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482
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|
1650 while (dead_to_right < free_target) { |
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changeset
|
1651 cur -= region_size; |
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changeset
|
1652 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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changeset
|
1653 dead_to_right = pointer_delta(space->end(), cur_destination); |
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|
1654 } |
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changeset
|
1655 _space_info[id].set_dense_prefix(cur); |
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|
1656 } |
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changeset
|
1657 } |
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changeset
|
1658 #endif // #ifndef PRODUCT |
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|
1659 |
0 | 1660 void PSParallelCompact::summarize_spaces_quick() |
1661 { | |
1662 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1663 const MutableSpace* space = _space_info[i].space(); | |
482
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|
1664 HeapWord** nta = _space_info[i].new_top_addr(); |
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|
1665 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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|
1666 space->bottom(), space->top(), NULL, |
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changeset
|
1667 space->bottom(), space->end(), nta); |
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1668 assert(result, "space must fit into itself"); |
0 | 1669 _space_info[i].set_dense_prefix(space->bottom()); |
1670 } | |
496
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1671 |
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1672 #ifndef PRODUCT |
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1673 if (ParallelOldGCSplitALot) { |
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1674 provoke_split_fill_survivor(to_space_id); |
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1675 } |
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1676 #endif // #ifndef PRODUCT |
0 | 1677 } |
1678 | |
1679 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1680 { | |
1681 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1682 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1683 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
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1684 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1685 // Only enough dead space is filled so that any remaining dead space to the |
1686 // left is larger than the minimum filler object. (The remainder is filled | |
1687 // during the copy/update phase.) | |
1688 // | |
1689 // The size of the dead space to the right of the boundary is not a | |
1690 // concern, since compaction will be able to use whatever space is | |
1691 // available. | |
1692 // | |
1693 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1694 // surrounds the space to be filled with an object. | |
1695 // | |
1696 // In the 32-bit VM, each bit represents two 32-bit words: | |
1697 // +---+ | |
1698 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1699 // end_bits: ... x x x | 0 | || 0 x x ... | |
1700 // +---+ | |
1701 // | |
1702 // In the 64-bit VM, each bit represents one 64-bit word: | |
1703 // +------------+ | |
1704 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1705 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1706 // +------------+ | |
1707 // +-------+ | |
1708 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1709 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1710 // +-------+ | |
1711 // +-----------+ | |
1712 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1713 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1714 // +-----------+ | |
1715 // +-------+ | |
1716 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1717 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1718 // +-------+ | |
1719 | |
1720 // Initially assume case a, c or e will apply. | |
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1721 size_t obj_len = CollectedHeap::min_fill_size(); |
0 | 1722 HeapWord* obj_beg = dense_prefix_end - obj_len; |
1723 | |
1724 #ifdef _LP64 | |
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1725 if (MinObjAlignment > 1) { // object alignment > heap word size |
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1726 // Cases a, c or e. |
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1727 } else if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { |
0 | 1728 // Case b above. |
1729 obj_beg = dense_prefix_end - 1; | |
1730 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1731 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1732 // Case d above. | |
1733 obj_beg = dense_prefix_end - 3; | |
1734 obj_len = 3; | |
1735 } | |
1736 #endif // #ifdef _LP64 | |
1737 | |
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1738 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1739 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1740 _summary_data.add_obj(obj_beg, obj_len); | |
1741 assert(start_array(id) != NULL, "sanity"); | |
1742 start_array(id)->allocate_block(obj_beg); | |
1743 } | |
1744 } | |
1745 | |
1746 void | |
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1747 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1748 { |
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1749 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1750 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1751 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1752 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1753 cur->set_source_region(0); |
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1754 } |
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1755 } |
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1756 |
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1757 void |
0 | 1758 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1759 { | |
1760 assert(id < last_space_id, "id out of range"); | |
483
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1761 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1762 ParallelOldGCSplitALot && id == old_space_id, |
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1763 "should have been reset in summarize_spaces_quick()"); |
0 | 1764 |
1765 const MutableSpace* space = _space_info[id].space(); | |
265
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1766 if (_space_info[id].new_top() != space->bottom()) { |
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1767 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1768 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1769 |
1770 #ifndef PRODUCT | |
265
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1771 if (TraceParallelOldGCDensePrefix) { |
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1772 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1773 dense_prefix_end); |
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1774 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1775 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1776 } |
0 | 1777 #endif // #ifndef PRODUCT |
1778 | |
483
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1779 // Recompute the summary data, taking into account the dense prefix. If |
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1780 // every last byte will be reclaimed, then the existing summary data which |
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1781 // compacts everything can be left in place. |
265
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1782 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1783 // If dead space crosses the dense prefix boundary, it is (at least |
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1784 // partially) filled with a dummy object, marked live and added to the |
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1785 // summary data. This simplifies the copy/update phase and must be done |
483
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1786 // before the final locations of objects are determined, to prevent |
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1787 // leaving a fragment of dead space that is too small to fill. |
265
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1788 fill_dense_prefix_end(id); |
482
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1789 |
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1790 // Compute the destination of each Region, and thus each object. |
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1791 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1792 _summary_data.summarize(_space_info[id].split_info(), |
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1793 dense_prefix_end, space->top(), NULL, |
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1794 dense_prefix_end, space->end(), |
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1795 _space_info[id].new_top_addr()); |
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1796 } |
0 | 1797 } |
1798 | |
1799 if (TraceParallelOldGCSummaryPhase) { | |
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1800 const size_t region_size = ParallelCompactData::RegionSize; |
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1801 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
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1802 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1803 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
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1804 HeapWord* const new_top = _space_info[id].new_top(); |
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1805 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1806 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1807 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
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1808 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1809 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1810 id, space->capacity_in_words(), dense_prefix_end, | |
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1811 dp_region, dp_words / region_size, |
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1812 cr_words / region_size, new_top); |
0 | 1813 } |
1814 } | |
1815 | |
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1816 #ifndef PRODUCT |
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1817 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1818 HeapWord* dst_beg, HeapWord* dst_end, |
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1819 SpaceId src_space_id, |
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1820 HeapWord* src_beg, HeapWord* src_end) |
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1821 { |
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1822 if (TraceParallelOldGCSummaryPhase) { |
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1823 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1824 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1825 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1826 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1827 SIZE_FORMAT "-" SIZE_FORMAT, |
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1828 src_space_id, space_names[src_space_id], |
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1829 dst_space_id, space_names[dst_space_id], |
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1830 src_beg, src_end, |
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1831 _summary_data.addr_to_region_idx(src_beg), |
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1832 _summary_data.addr_to_region_idx(src_end), |
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1833 dst_beg, dst_end, |
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1834 _summary_data.addr_to_region_idx(dst_beg), |
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1835 _summary_data.addr_to_region_idx(dst_end)); |
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1836 } |
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1837 } |
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1838 #endif // #ifndef PRODUCT |
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1839 |
0 | 1840 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1841 bool maximum_compaction) | |
1842 { | |
1843 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1844 // trace("2"); | |
1845 | |
1846 #ifdef ASSERT | |
1847 if (TraceParallelOldGCMarkingPhase) { | |
1848 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1849 "add_obj_bytes=" SIZE_FORMAT, | |
1850 add_obj_count, add_obj_size * HeapWordSize); | |
1851 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1852 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1853 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1854 } | |
1855 #endif // #ifdef ASSERT | |
1856 | |
1857 // Quick summarization of each space into itself, to see how much is live. | |
1858 summarize_spaces_quick(); | |
1859 | |
1860 if (TraceParallelOldGCSummaryPhase) { | |
1861 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1862 Universe::print(); | |
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1863 NOT_PRODUCT(print_region_ranges()); |
0 | 1864 if (Verbose) { |
1865 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1866 } | |
1867 } | |
1868 | |
1869 // The amount of live data that will end up in old space (assuming it fits). | |
1870 size_t old_space_total_live = 0; | |
482
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1871 assert(perm_space_id < old_space_id, "should not count perm data here"); |
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1872 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1873 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1874 _space_info[id].space()->bottom()); | |
1875 } | |
1876 | |
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1877 MutableSpace* const old_space = _space_info[old_space_id].space(); |
483
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1878 const size_t old_capacity = old_space->capacity_in_words(); |
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1879 if (old_space_total_live > old_capacity) { |
0 | 1880 // XXX - should also try to expand |
1881 maximum_compaction = true; | |
1882 } | |
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1883 #ifndef PRODUCT |
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1884 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1885 provoke_split(maximum_compaction); |
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1886 } |
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1887 #endif // #ifndef PRODUCT |
0 | 1888 |
1889 // Permanent and Old generations. | |
1890 summarize_space(perm_space_id, maximum_compaction); | |
1891 summarize_space(old_space_id, maximum_compaction); | |
1892 | |
482
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1893 // Summarize the remaining spaces in the young gen. The initial target space |
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1894 // is the old gen. If a space does not fit entirely into the target, then the |
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1895 // remainder is compacted into the space itself and that space becomes the new |
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1896 // target. |
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1897 SpaceId dst_space_id = old_space_id; |
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1898 HeapWord* dst_space_end = old_space->end(); |
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1899 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1900 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1901 const MutableSpace* space = _space_info[id].space(); |
1902 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1903 space->bottom()); | |
482
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1904 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1905 |
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1906 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1907 SpaceId(id), space->bottom(), space->top());) |
266
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1908 if (live > 0 && live <= available) { |
0 | 1909 // All the live data will fit. |
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1910 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1911 space->bottom(), space->top(), |
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1912 NULL, |
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1913 *new_top_addr, dst_space_end, |
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1914 new_top_addr); |
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1915 assert(done, "space must fit into old gen"); |
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1916 |
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1917 // Reset the new_top value for the space. |
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1918 _space_info[id].set_new_top(space->bottom()); |
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1919 } else if (live > 0) { |
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1920 // Attempt to fit part of the source space into the target space. |
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1921 HeapWord* next_src_addr = NULL; |
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1922 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1923 space->bottom(), space->top(), |
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1924 &next_src_addr, |
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1925 *new_top_addr, dst_space_end, |
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1926 new_top_addr); |
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1927 assert(!done, "space should not fit into old gen"); |
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1928 assert(next_src_addr != NULL, "sanity"); |
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1929 |
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1930 // The source space becomes the new target, so the remainder is compacted |
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1931 // within the space itself. |
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1932 dst_space_id = SpaceId(id); |
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1933 dst_space_end = space->end(); |
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1934 new_top_addr = _space_info[id].new_top_addr(); |
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1935 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1936 space->bottom(), dst_space_end, |
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1937 SpaceId(id), next_src_addr, space->top());) |
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1938 done = _summary_data.summarize(_space_info[id].split_info(), |
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1939 next_src_addr, space->top(), |
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1940 NULL, |
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1941 space->bottom(), dst_space_end, |
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1942 new_top_addr); |
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1943 assert(done, "space must fit when compacted into itself"); |
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1944 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1945 } |
1946 } | |
1947 | |
1948 if (TraceParallelOldGCSummaryPhase) { | |
1949 tty->print_cr("summary_phase: after final summarization"); | |
1950 Universe::print(); | |
375
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1951 NOT_PRODUCT(print_region_ranges()); |
0 | 1952 if (Verbose) { |
1953 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1954 } | |
1955 } | |
1956 } | |
1957 | |
1958 // This method should contain all heap-specific policy for invoking a full | |
1959 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1960 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1961 // before full gc, or any other specialized behavior, it needs to be added here. | |
1962 // | |
1963 // Note that this method should only be called from the vm_thread while at a | |
1964 // safepoint. | |
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1965 // |
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1966 // Note that the all_soft_refs_clear flag in the collector policy |
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1967 // may be true because this method can be called without intervening |
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1968 // activity. For example when the heap space is tight and full measure |
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1969 // are being taken to free space. |
0 | 1970 void PSParallelCompact::invoke(bool maximum_heap_compaction) { |
1971 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1972 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1973 "should be in vm thread"); | |
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1974 |
0 | 1975 ParallelScavengeHeap* heap = gc_heap(); |
1976 GCCause::Cause gc_cause = heap->gc_cause(); | |
1977 assert(!heap->is_gc_active(), "not reentrant"); | |
1978 | |
1979 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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1980 IsGCActiveMark mark; |
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1981 |
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1982 if (ScavengeBeforeFullGC) { |
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1983 PSScavenge::invoke_no_policy(); |
0 | 1984 } |
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1985 |
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1986 const bool clear_all_soft_refs = |
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1987 heap->collector_policy()->should_clear_all_soft_refs(); |
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1988 |
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1989 PSParallelCompact::invoke_no_policy(clear_all_soft_refs || |
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1990 maximum_heap_compaction); |
0 | 1991 } |
1992 | |
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1993 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1994 size_t addr_region_index = addr_to_region_idx(addr); |
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1995 return region_index == addr_region_index; |
0 | 1996 } |
1997 | |
1998 // This method contains no policy. You should probably | |
1999 // be calling invoke() instead. | |
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2000 bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { |
0 | 2001 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
2002 assert(ref_processor() != NULL, "Sanity"); | |
2003 | |
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2004 if (GC_locker::check_active_before_gc()) { |
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2005 return false; |
0 | 2006 } |
2007 | |
2008 TimeStamp marking_start; | |
2009 TimeStamp compaction_start; | |
2010 TimeStamp collection_exit; | |
2011 | |
2012 ParallelScavengeHeap* heap = gc_heap(); | |
2013 GCCause::Cause gc_cause = heap->gc_cause(); | |
2014 PSYoungGen* young_gen = heap->young_gen(); | |
2015 PSOldGen* old_gen = heap->old_gen(); | |
2016 PSPermGen* perm_gen = heap->perm_gen(); | |
2017 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
2018 | |
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2019 // The scope of casr should end after code that can change |
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2020 // CollectorPolicy::_should_clear_all_soft_refs. |
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2021 ClearedAllSoftRefs casr(maximum_heap_compaction, |
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2022 heap->collector_policy()); |
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2023 |
263
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2024 if (ZapUnusedHeapArea) { |
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2025 // Save information needed to minimize mangling |
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2026 heap->record_gen_tops_before_GC(); |
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2027 } |
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2028 |
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2029 heap->pre_full_gc_dump(); |
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2030 |
0 | 2031 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
2032 | |
2033 // Make sure data structures are sane, make the heap parsable, and do other | |
2034 // miscellaneous bookkeeping. | |
2035 PreGCValues pre_gc_values; | |
2036 pre_compact(&pre_gc_values); | |
2037 | |
210 | 2038 // Get the compaction manager reserved for the VM thread. |
2039 ParCompactionManager* const vmthread_cm = | |
2040 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
2041 | |
0 | 2042 // Place after pre_compact() where the number of invocations is incremented. |
2043 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
2044 | |
2045 { | |
2046 ResourceMark rm; | |
2047 HandleMark hm; | |
2048 | |
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2049 // Set the number of GC threads to be used in this collection |
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2050 gc_task_manager()->set_active_gang(); |
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2051 gc_task_manager()->task_idle_workers(); |
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2052 heap->set_par_threads(gc_task_manager()->active_workers()); |
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2053 |
0 | 2054 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
2055 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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2056 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 2057 TraceCollectorStats tcs(counters()); |
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2058 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 2059 |
2060 if (TraceGen1Time) accumulated_time()->start(); | |
2061 | |
2062 // Let the size policy know we're starting | |
2063 size_policy->major_collection_begin(); | |
2064 | |
2065 // When collecting the permanent generation methodOops may be moving, | |
2066 // so we either have to flush all bcp data or convert it into bci. | |
2067 CodeCache::gc_prologue(); | |
2068 Threads::gc_prologue(); | |
2069 | |
2070 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2071 | |
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2072 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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2073 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 2074 |
2075 bool marked_for_unloading = false; | |
2076 | |
2077 marking_start.update(); | |
210 | 2078 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 2079 |
2080 #ifndef PRODUCT | |
2081 if (TraceParallelOldGCMarkingPhase) { | |
2082 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
2083 "cas_by_another %d", | |
2084 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
2085 mark_bitmap()->cas_by_another()); | |
2086 } | |
2087 #endif // #ifndef PRODUCT | |
2088 | |
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2089 bool max_on_system_gc = UseMaximumCompactionOnSystemGC |
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2090 && gc_cause == GCCause::_java_lang_system_gc; |
210 | 2091 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2092 |
2093 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2094 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2095 | |
2096 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2097 // needed by the compaction for filling holes in the dense prefix. | |
2098 adjust_roots(); | |
2099 | |
2100 compaction_start.update(); | |
2101 // Does the perm gen always have to be done serially because | |
2102 // klasses are used in the update of an object? | |
210 | 2103 compact_perm(vmthread_cm); |
0 | 2104 |
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2105 compact(); |
0 | 2106 |
2107 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2108 // done before resizing. | |
2109 post_compact(); | |
2110 | |
2111 // Let the size policy know we're done | |
2112 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2113 | |
2114 if (UseAdaptiveSizePolicy) { | |
2115 if (PrintAdaptiveSizePolicy) { | |
2116 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2117 gclog_or_tty->stamp(); | |
2118 gclog_or_tty->print_cr(" collection: %d ", | |
2119 heap->total_collections()); | |
2120 if (Verbose) { | |
2121 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
2122 " perm_gen_capacity: %d ", | |
2123 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
2124 perm_gen->capacity_in_bytes()); | |
2125 } | |
2126 } | |
2127 | |
2128 // Don't check if the size_policy is ready here. Let | |
2129 // the size_policy check that internally. | |
2130 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2131 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2132 UseAdaptiveSizePolicyWithSystemGC)) { | |
2133 // Calculate optimal free space amounts | |
2134 assert(young_gen->max_size() > | |
2135 young_gen->from_space()->capacity_in_bytes() + | |
2136 young_gen->to_space()->capacity_in_bytes(), | |
2137 "Sizes of space in young gen are out-of-bounds"); | |
2138 size_t max_eden_size = young_gen->max_size() - | |
2139 young_gen->from_space()->capacity_in_bytes() - | |
2140 young_gen->to_space()->capacity_in_bytes(); | |
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2141 size_policy->compute_generation_free_space( |
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2142 young_gen->used_in_bytes(), |
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2143 young_gen->eden_space()->used_in_bytes(), |
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2144 old_gen->used_in_bytes(), |
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2145 perm_gen->used_in_bytes(), |
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2146 young_gen->eden_space()->capacity_in_bytes(), |
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2147 old_gen->max_gen_size(), |
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2148 max_eden_size, |
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2149 true /* full gc*/, |
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2150 gc_cause, |
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2151 heap->collector_policy()); |
263
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2152 |
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2153 heap->resize_old_gen( |
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2154 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2155 |
2156 // Don't resize the young generation at an major collection. A | |
2157 // desired young generation size may have been calculated but | |
2158 // resizing the young generation complicates the code because the | |
2159 // resizing of the old generation may have moved the boundary | |
2160 // between the young generation and the old generation. Let the | |
2161 // young generation resizing happen at the minor collections. | |
2162 } | |
2163 if (PrintAdaptiveSizePolicy) { | |
2164 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2165 heap->total_collections()); | |
2166 } | |
2167 } | |
2168 | |
2169 if (UsePerfData) { | |
2170 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2171 counters->update_counters(); | |
2172 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2173 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2174 } | |
2175 | |
2176 heap->resize_all_tlabs(); | |
2177 | |
2178 // We collected the perm gen, so we'll resize it here. | |
2179 perm_gen->compute_new_size(pre_gc_values.perm_gen_used()); | |
2180 | |
2181 if (TraceGen1Time) accumulated_time()->stop(); | |
2182 | |
2183 if (PrintGC) { | |
2184 if (PrintGCDetails) { | |
2185 // No GC timestamp here. This is after GC so it would be confusing. | |
2186 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2187 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2188 heap->print_heap_change(pre_gc_values.heap_used()); | |
2189 // Print perm gen last (print_heap_change() excludes the perm gen). | |
2190 perm_gen->print_used_change(pre_gc_values.perm_gen_used()); | |
2191 } else { | |
2192 heap->print_heap_change(pre_gc_values.heap_used()); | |
2193 } | |
2194 } | |
2195 | |
2196 // Track memory usage and detect low memory | |
2197 MemoryService::track_memory_usage(); | |
2198 heap->update_counters(); | |
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2199 gc_task_manager()->release_idle_workers(); |
0 | 2200 } |
2201 | |
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2202 #ifdef ASSERT |
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2203 for (size_t i = 0; i < ParallelGCThreads + 1; ++i) { |
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2204 ParCompactionManager* const cm = |
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2205 ParCompactionManager::manager_array(int(i)); |
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2206 assert(cm->marking_stack()->is_empty(), "should be empty"); |
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2207 assert(ParCompactionManager::region_list(int(i))->is_empty(), "should be empty"); |
1836
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2208 assert(cm->revisit_klass_stack()->is_empty(), "should be empty"); |
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2209 } |
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2210 #endif // ASSERT |
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2211 |
0 | 2212 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
2213 HandleMark hm; // Discard invalid handles created during verification | |
2214 gclog_or_tty->print(" VerifyAfterGC:"); | |
2215 Universe::verify(false); | |
2216 } | |
2217 | |
2218 // Re-verify object start arrays | |
2219 if (VerifyObjectStartArray && | |
2220 VerifyAfterGC) { | |
2221 old_gen->verify_object_start_array(); | |
2222 perm_gen->verify_object_start_array(); | |
2223 } | |
2224 | |
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2225 if (ZapUnusedHeapArea) { |
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2226 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2227 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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2228 } |
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2229 |
0 | 2230 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2231 | |
2232 collection_exit.update(); | |
2233 | |
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2234 heap->print_heap_after_gc(); |
0 | 2235 if (PrintGCTaskTimeStamps) { |
2236 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2237 INT64_FORMAT, | |
2238 marking_start.ticks(), compaction_start.ticks(), | |
2239 collection_exit.ticks()); | |
2240 gc_task_manager()->print_task_time_stamps(); | |
2241 } | |
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2242 |
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2243 heap->post_full_gc_dump(); |
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2244 |
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2245 #ifdef TRACESPINNING |
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2246 ParallelTaskTerminator::print_termination_counts(); |
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2247 #endif |
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2248 |
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2249 return true; |
0 | 2250 } |
2251 | |
2252 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2253 PSYoungGen* young_gen, | |
2254 PSOldGen* old_gen) { | |
2255 MutableSpace* const eden_space = young_gen->eden_space(); | |
2256 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2257 assert(young_gen->virtual_space()->alignment() == | |
2258 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2259 | |
2260 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2261 return false; | |
2262 } | |
2263 | |
2264 // Both generations must be completely committed. | |
2265 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2266 return false; | |
2267 } | |
2268 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2269 return false; | |
2270 } | |
2271 | |
2272 // Figure out how much to take from eden. Include the average amount promoted | |
2273 // in the total; otherwise the next young gen GC will simply bail out to a | |
2274 // full GC. | |
2275 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2276 const size_t eden_used = eden_space->used_in_bytes(); | |
2277 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2278 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2279 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2280 | |
2281 if (absorb_size >= eden_capacity) { | |
2282 return false; // Must leave some space in eden. | |
2283 } | |
2284 | |
2285 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2286 if (new_young_size < young_gen->min_gen_size()) { | |
2287 return false; // Respect young gen minimum size. | |
2288 } | |
2289 | |
2290 if (TraceAdaptiveGCBoundary && Verbose) { | |
2291 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2292 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2293 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2294 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2295 absorb_size / K, | |
2296 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2297 young_gen->from_space()->used_in_bytes() / K, | |
2298 young_gen->to_space()->used_in_bytes() / K, | |
2299 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2300 } | |
2301 | |
2302 // Fill the unused part of the old gen. | |
2303 MutableSpace* const old_space = old_gen->object_space(); | |
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2304 HeapWord* const unused_start = old_space->top(); |
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2305 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2306 |
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2307 if (unused_words > 0) { |
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2308 if (unused_words < CollectedHeap::min_fill_size()) { |
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2309 return false; // If the old gen cannot be filled, must give up. |
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2310 } |
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2311 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2312 } |
2313 | |
2314 // Take the live data from eden and set both top and end in the old gen to | |
2315 // eden top. (Need to set end because reset_after_change() mangles the region | |
2316 // from end to virtual_space->high() in debug builds). | |
2317 HeapWord* const new_top = eden_space->top(); | |
2318 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2319 absorb_size); | |
2320 young_gen->reset_after_change(); | |
2321 old_space->set_top(new_top); | |
2322 old_space->set_end(new_top); | |
2323 old_gen->reset_after_change(); | |
2324 | |
2325 // Update the object start array for the filler object and the data from eden. | |
2326 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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2327 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2328 start_array->allocate_block(p); |
0 | 2329 } |
2330 | |
2331 // Could update the promoted average here, but it is not typically updated at | |
2332 // full GCs and the value to use is unclear. Something like | |
2333 // | |
2334 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2335 | |
2336 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2337 return true; | |
2338 } | |
2339 | |
2340 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2341 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2342 "shouldn't return NULL"); | |
2343 return ParallelScavengeHeap::gc_task_manager(); | |
2344 } | |
2345 | |
2346 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2347 bool maximum_heap_compaction) { | |
2348 // Recursively traverse all live objects and mark them | |
2349 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2350 | |
2351 ParallelScavengeHeap* heap = gc_heap(); | |
2352 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2353 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2354 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2355 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2356 |
2357 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2358 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2359 | |
2360 { | |
2361 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
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2362 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 2363 |
2364 GCTaskQueue* q = GCTaskQueue::create(); | |
2365 | |
2366 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2367 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2368 // We scan the thread roots in parallel | |
2369 Threads::create_thread_roots_marking_tasks(q); | |
2370 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2371 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2372 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2373 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2374 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
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2375 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::code_cache)); |
0 | 2376 |
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2377 if (active_gc_threads > 1) { |
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2378 for (uint j = 0; j < active_gc_threads; j++) { |
0 | 2379 q->enqueue(new StealMarkingTask(&terminator)); |
2380 } | |
2381 } | |
2382 | |
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2383 gc_task_manager()->execute_and_wait(q); |
0 | 2384 } |
2385 | |
2386 // Process reference objects found during marking | |
2387 { | |
2388 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2389 if (ref_processor()->processing_is_mt()) { | |
2390 RefProcTaskExecutor task_executor; | |
2391 ref_processor()->process_discovered_references( | |
453
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2392 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2393 &task_executor); |
0 | 2394 } else { |
2395 ref_processor()->process_discovered_references( | |
453
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2396 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2397 } |
2398 } | |
2399 | |
2400 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2401 // Follow system dictionary roots and unload classes. | |
2402 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2403 | |
2404 // Follow code cache roots. | |
2405 CodeCache::do_unloading(is_alive_closure(), &mark_and_push_closure, | |
2406 purged_class); | |
1311
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2407 cm->follow_marking_stacks(); // Flush marking stack. |
0 | 2408 |
2409 // Update subklass/sibling/implementor links of live klasses | |
2410 // revisit_klass_stack is used in follow_weak_klass_links(). | |
941 | 2411 follow_weak_klass_links(); |
2412 | |
2413 // Revisit memoized MDO's and clear any unmarked weak refs | |
2414 follow_mdo_weak_refs(); | |
0 | 2415 |
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2416 // Visit interned string tables and delete unmarked oops |
0 | 2417 StringTable::unlink(is_alive_closure()); |
2177
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2418 // Clean up unreferenced symbols in symbol table. |
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2419 SymbolTable::unlink(); |
0 | 2420 |
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2421 assert(cm->marking_stacks_empty(), "marking stacks should be empty"); |
0 | 2422 } |
2423 | |
2424 // This should be moved to the shared markSweep code! | |
2425 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2426 public: | |
2427 void do_object(oop p) { ShouldNotReachHere(); } | |
2428 bool do_object_b(oop p) { return true; } | |
2429 }; | |
2430 static PSAlwaysTrueClosure always_true; | |
2431 | |
2432 void PSParallelCompact::adjust_roots() { | |
2433 // Adjust the pointers to reflect the new locations | |
2434 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2435 | |
2436 // General strong roots. | |
2437 Universe::oops_do(adjust_root_pointer_closure()); | |
2438 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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2439 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 2440 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
2441 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
2442 Management::oops_do(adjust_root_pointer_closure()); | |
2443 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
2444 // SO_AllClasses | |
2445 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
2446 | |
2447 // Now adjust pointers in remaining weak roots. (All of which should | |
2448 // have been cleared if they pointed to non-surviving objects.) | |
2449 // Global (weak) JNI handles | |
2450 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
2451 | |
2452 CodeCache::oops_do(adjust_pointer_closure()); | |
2453 StringTable::oops_do(adjust_root_pointer_closure()); | |
2454 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
2455 // Roots were visited so references into the young gen in roots | |
2456 // may have been scanned. Process them also. | |
2457 // Should the reference processor have a span that excludes | |
2458 // young gen objects? | |
2459 PSScavenge::reference_processor()->weak_oops_do( | |
2460 adjust_root_pointer_closure()); | |
2461 } | |
2462 | |
2463 void PSParallelCompact::compact_perm(ParCompactionManager* cm) { | |
2464 TraceTime tm("compact perm gen", print_phases(), true, gclog_or_tty); | |
2465 // trace("4"); | |
2466 | |
2467 gc_heap()->perm_gen()->start_array()->reset(); | |
2468 move_and_update(cm, perm_space_id); | |
2469 } | |
2470 | |
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2471 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2472 uint parallel_gc_threads) |
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2473 { |
0 | 2474 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2475 | |
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2476 // Find the threads that are active |
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2477 unsigned int which = 0; |
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2478 |
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2479 const uint task_count = MAX2(parallel_gc_threads, 1U); |
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2480 for (uint j = 0; j < task_count; j++) { |
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2481 q->enqueue(new DrainStacksCompactionTask(j)); |
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2482 ParCompactionManager::verify_region_list_empty(j); |
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2483 // Set the region stacks variables to "no" region stack values |
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2484 // so that they will be recognized and needing a region stack |
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2485 // in the stealing tasks if they do not get one by executing |
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2486 // a draining stack. |
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2487 ParCompactionManager* cm = ParCompactionManager::manager_array(j); |
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2488 cm->set_region_stack(NULL); |
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2489 cm->set_region_stack_index((uint)max_uintx); |
0 | 2490 } |
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2491 ParCompactionManager::reset_recycled_stack_index(); |
0 | 2492 |
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2493 // Find all regions that are available (can be filled immediately) and |
0 | 2494 // distribute them to the thread stacks. The iteration is done in reverse |
375
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2495 // order (high to low) so the regions will be removed in ascending order. |
0 | 2496 |
2497 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2498 | |
375
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2499 size_t fillable_regions = 0; // A count for diagnostic purposes. |
4095
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2500 // A region index which corresponds to the tasks created above. |
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2501 // "which" must be 0 <= which < task_count |
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2502 |
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2503 which = 0; |
0 | 2504 for (unsigned int id = to_space_id; id > perm_space_id; --id) { |
2505 SpaceInfo* const space_info = _space_info + id; | |
2506 MutableSpace* const space = space_info->space(); | |
2507 HeapWord* const new_top = space_info->new_top(); | |
2508 | |
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2509 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2510 const size_t end_region = |
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2511 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2512 assert(end_region > 0, "perm gen cannot be empty"); |
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2513 |
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2514 for (size_t cur = end_region - 1; cur >= beg_region; --cur) { |
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2515 if (sd.region(cur)->claim_unsafe()) { |
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2516 ParCompactionManager::region_list_push(which, cur); |
0 | 2517 |
2518 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2519 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2520 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
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2521 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2522 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2523 } | |
2524 | |
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2525 NOT_PRODUCT(++fillable_regions;) |
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2526 |
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2527 // Assign regions to tasks in round-robin fashion. |
0 | 2528 if (++which == task_count) { |
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2529 assert(which <= parallel_gc_threads, |
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2530 "Inconsistent number of workers"); |
0 | 2531 which = 0; |
2532 } | |
2533 } | |
2534 } | |
2535 } | |
2536 | |
2537 if (TraceParallelOldGCCompactionPhase) { | |
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2538 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2539 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2540 } |
2541 } | |
2542 | |
2543 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2544 | |
2545 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2546 uint parallel_gc_threads) { | |
2547 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2548 | |
2549 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2550 | |
2551 // Iterate over all the spaces adding tasks for updating | |
375
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2552 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2553 // will work on opening the gaps and the remaining gc threads |
2554 // will work on the dense prefix. | |
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2555 unsigned int space_id; |
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2556 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2557 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2558 const MutableSpace* const space = _space_info[space_id].space(); | |
2559 | |
2560 if (dense_prefix_end == space->bottom()) { | |
2561 // There is no dense prefix for this space. | |
2562 continue; | |
2563 } | |
2564 | |
375
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2565 // The dense prefix is before this region. |
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2566 size_t region_index_end_dense_prefix = |
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2567 sd.addr_to_region_idx(dense_prefix_end); |
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2568 RegionData* const dense_prefix_cp = |
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2569 sd.region(region_index_end_dense_prefix); |
0 | 2570 assert(dense_prefix_end == space->end() || |
2571 dense_prefix_cp->available() || | |
2572 dense_prefix_cp->claimed(), | |
375
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2573 "The region after the dense prefix should always be ready to fill"); |
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2574 |
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2575 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2576 |
2577 // Is there dense prefix work? | |
375
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2578 size_t total_dense_prefix_regions = |
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2579 region_index_end_dense_prefix - region_index_start; |
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2580 // How many regions of the dense prefix should be given to |
0 | 2581 // each thread? |
375
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2582 if (total_dense_prefix_regions > 0) { |
0 | 2583 uint tasks_for_dense_prefix = 1; |
3251
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2584 if (total_dense_prefix_regions <= |
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2585 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
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2586 // Don't over partition. This assumes that |
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2587 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value |
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2588 // so there are not many regions to process. |
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2589 tasks_for_dense_prefix = parallel_gc_threads; |
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2590 } else { |
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2591 // Over partition |
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2592 tasks_for_dense_prefix = parallel_gc_threads * |
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2593 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; |
0 | 2594 } |
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2595 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2596 tasks_for_dense_prefix; |
375
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2597 // Give each thread at least 1 region. |
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2598 if (regions_per_thread == 0) { |
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2599 regions_per_thread = 1; |
0 | 2600 } |
2601 | |
2602 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2603 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2604 break; |
2605 } | |
375
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2606 // region_index_end is not processed |
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2607 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2608 region_index_end_dense_prefix); |
482
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2609 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2610 region_index_start, |
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2611 region_index_end)); |
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2612 region_index_start = region_index_end; |
0 | 2613 } |
2614 } | |
2615 // This gets any part of the dense prefix that did not | |
2616 // fit evenly. | |
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2617 if (region_index_start < region_index_end_dense_prefix) { |
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2618 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2619 region_index_start, |
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2620 region_index_end_dense_prefix)); |
0 | 2621 } |
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2622 } |
0 | 2623 } |
2624 | |
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2625 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2626 GCTaskQueue* q, |
2627 ParallelTaskTerminator* terminator_ptr, | |
2628 uint parallel_gc_threads) { | |
2629 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2630 | |
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2631 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2632 // other threads. |
2633 if (parallel_gc_threads > 1) { | |
2634 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2635 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2636 } |
2637 } | |
2638 } | |
2639 | |
2640 void PSParallelCompact::compact() { | |
2641 // trace("5"); | |
2642 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2643 | |
2644 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2645 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2646 PSOldGen* old_gen = heap->old_gen(); | |
2647 old_gen->start_array()->reset(); | |
2648 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2649 uint active_gc_threads = heap->gc_task_manager()->active_workers(); |
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2650 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
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2651 ParallelTaskTerminator terminator(active_gc_threads, qset); |
0 | 2652 |
2653 GCTaskQueue* q = GCTaskQueue::create(); | |
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2654 enqueue_region_draining_tasks(q, active_gc_threads); |
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2655 enqueue_dense_prefix_tasks(q, active_gc_threads); |
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2656 enqueue_region_stealing_tasks(q, &terminator, active_gc_threads); |
0 | 2657 |
2658 { | |
2659 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2660 | |
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2661 gc_task_manager()->execute_and_wait(q); |
0 | 2662 |
2663 #ifdef ASSERT | |
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2664 // Verify that all regions have been processed before the deferred updates. |
0 | 2665 // Note that perm_space_id is skipped; this type of verification is not |
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2666 // valid until the perm gen is compacted by regions. |
0 | 2667 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2668 verify_complete(SpaceId(id)); | |
2669 } | |
2670 #endif | |
2671 } | |
2672 | |
2673 { | |
2674 // Update the deferred objects, if any. Any compaction manager can be used. | |
2675 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2676 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2677 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2678 update_deferred_objects(cm, SpaceId(id)); | |
2679 } | |
2680 } | |
2681 } | |
2682 | |
2683 #ifdef ASSERT | |
2684 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2685 // All Regions between space bottom() to new_top() should be marked as filled |
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2686 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2687 // should have been emptied). |
2688 ParallelCompactData& sd = summary_data(); | |
2689 SpaceInfo si = _space_info[space_id]; | |
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2690 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2691 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2692 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2693 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2694 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2695 |
2696 bool issued_a_warning = false; | |
2697 | |
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2698 size_t cur_region; |
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2699 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2700 const RegionData* const c = sd.region(cur_region); |
0 | 2701 if (!c->completed()) { |
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2702 warning("region " SIZE_FORMAT " not filled: " |
0 | 2703 "destination_count=" SIZE_FORMAT, |
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2704 cur_region, c->destination_count()); |
0 | 2705 issued_a_warning = true; |
2706 } | |
2707 } | |
2708 | |
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2709 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2710 const RegionData* const c = sd.region(cur_region); |
0 | 2711 if (!c->available()) { |
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2712 warning("region " SIZE_FORMAT " not empty: " |
0 | 2713 "destination_count=" SIZE_FORMAT, |
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2714 cur_region, c->destination_count()); |
0 | 2715 issued_a_warning = true; |
2716 } | |
2717 } | |
2718 | |
2719 if (issued_a_warning) { | |
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2720 print_region_ranges(); |
0 | 2721 } |
2722 } | |
2723 #endif // #ifdef ASSERT | |
2724 | |
2725 void | |
941 | 2726 PSParallelCompact::follow_weak_klass_links() { |
0 | 2727 // All klasses on the revisit stack are marked at this point. |
2728 // Update and follow all subklass, sibling and implementor links. | |
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2729 // Check all the stacks here even if not all the workers are active. |
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2730 // There is no accounting which indicates which stacks might have |
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2731 // contents to be followed. |
941 | 2732 if (PrintRevisitStats) { |
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2733 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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2734 SystemDictionary::number_of_classes()); |
941 | 2735 } |
2736 for (uint i = 0; i < ParallelGCThreads + 1; i++) { | |
0 | 2737 ParCompactionManager* cm = ParCompactionManager::manager_array(i); |
2738 KeepAliveClosure keep_alive_closure(cm); | |
6197 | 2739 Stack<Klass*, mtGC>* const rks = cm->revisit_klass_stack(); |
941 | 2740 if (PrintRevisitStats) { |
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2741 gclog_or_tty->print_cr("Revisit klass stack[%u] length = " SIZE_FORMAT, |
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2742 i, rks->size()); |
941 | 2743 } |
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2744 while (!rks->is_empty()) { |
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2745 Klass* const k = rks->pop(); |
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2746 k->follow_weak_klass_links(is_alive_closure(), &keep_alive_closure); |
0 | 2747 } |
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2748 |
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2749 cm->follow_marking_stacks(); |
0 | 2750 } |
2751 } | |
2752 | |
2753 void | |
2754 PSParallelCompact::revisit_weak_klass_link(ParCompactionManager* cm, Klass* k) { | |
2755 cm->revisit_klass_stack()->push(k); | |
2756 } | |
2757 | |
941 | 2758 void PSParallelCompact::revisit_mdo(ParCompactionManager* cm, DataLayout* p) { |
2759 cm->revisit_mdo_stack()->push(p); | |
2760 } | |
2761 | |
2762 void PSParallelCompact::follow_mdo_weak_refs() { | |
2763 // All strongly reachable oops have been marked at this point; | |
2764 // we can visit and clear any weak references from MDO's which | |
2765 // we memoized during the strong marking phase. | |
2766 if (PrintRevisitStats) { | |
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2767 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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2768 SystemDictionary::number_of_classes()); |
941 | 2769 } |
2770 for (uint i = 0; i < ParallelGCThreads + 1; i++) { | |
2771 ParCompactionManager* cm = ParCompactionManager::manager_array(i); | |
6197 | 2772 Stack<DataLayout*, mtGC>* rms = cm->revisit_mdo_stack(); |
941 | 2773 if (PrintRevisitStats) { |
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2774 gclog_or_tty->print_cr("Revisit MDO stack[%u] size = " SIZE_FORMAT, |
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2775 i, rms->size()); |
941 | 2776 } |
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2777 while (!rms->is_empty()) { |
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2778 rms->pop()->follow_weak_refs(is_alive_closure()); |
941 | 2779 } |
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2780 |
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2781 cm->follow_marking_stacks(); |
941 | 2782 } |
2783 } | |
2784 | |
2785 | |
0 | 2786 #ifdef VALIDATE_MARK_SWEEP |
2787 | |
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2788 void PSParallelCompact::track_adjusted_pointer(void* p, bool isroot) { |
0 | 2789 if (!ValidateMarkSweep) |
2790 return; | |
2791 | |
2792 if (!isroot) { | |
2793 if (_pointer_tracking) { | |
2794 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
2795 _adjusted_pointers->remove(p); | |
2796 } | |
2797 } else { | |
2798 ptrdiff_t index = _root_refs_stack->find(p); | |
2799 if (index != -1) { | |
2800 int l = _root_refs_stack->length(); | |
2801 if (l > 0 && l - 1 != index) { | |
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2802 void* last = _root_refs_stack->pop(); |
0 | 2803 assert(last != p, "should be different"); |
2804 _root_refs_stack->at_put(index, last); | |
2805 } else { | |
2806 _root_refs_stack->remove(p); | |
2807 } | |
2808 } | |
2809 } | |
2810 } | |
2811 | |
2812 | |
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2813 void PSParallelCompact::check_adjust_pointer(void* p) { |
0 | 2814 _adjusted_pointers->push(p); |
2815 } | |
2816 | |
2817 | |
2818 class AdjusterTracker: public OopClosure { | |
2819 public: | |
2820 AdjusterTracker() {}; | |
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2821 void do_oop(oop* o) { PSParallelCompact::check_adjust_pointer(o); } |
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2822 void do_oop(narrowOop* o) { PSParallelCompact::check_adjust_pointer(o); } |
0 | 2823 }; |
2824 | |
2825 | |
2826 void PSParallelCompact::track_interior_pointers(oop obj) { | |
2827 if (ValidateMarkSweep) { | |
2828 _adjusted_pointers->clear(); | |
2829 _pointer_tracking = true; | |
2830 | |
2831 AdjusterTracker checker; | |
2832 obj->oop_iterate(&checker); | |
2833 } | |
2834 } | |
2835 | |
2836 | |
2837 void PSParallelCompact::check_interior_pointers() { | |
2838 if (ValidateMarkSweep) { | |
2839 _pointer_tracking = false; | |
2840 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
2841 } | |
2842 } | |
2843 | |
2844 | |
2845 void PSParallelCompact::reset_live_oop_tracking(bool at_perm) { | |
2846 if (ValidateMarkSweep) { | |
2847 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
2848 _live_oops_index = at_perm ? _live_oops_index_at_perm : 0; | |
2849 } | |
2850 } | |
2851 | |
2852 | |
2853 void PSParallelCompact::register_live_oop(oop p, size_t size) { | |
2854 if (ValidateMarkSweep) { | |
2855 _live_oops->push(p); | |
2856 _live_oops_size->push(size); | |
2857 _live_oops_index++; | |
2858 } | |
2859 } | |
2860 | |
2861 void PSParallelCompact::validate_live_oop(oop p, size_t size) { | |
2862 if (ValidateMarkSweep) { | |
2863 oop obj = _live_oops->at((int)_live_oops_index); | |
2864 guarantee(obj == p, "should be the same object"); | |
2865 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
2866 _live_oops_index++; | |
2867 } | |
2868 } | |
2869 | |
2870 void PSParallelCompact::live_oop_moved_to(HeapWord* q, size_t size, | |
2871 HeapWord* compaction_top) { | |
2872 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
2873 "should be moved to forwarded location"); | |
2874 if (ValidateMarkSweep) { | |
2875 PSParallelCompact::validate_live_oop(oop(q), size); | |
2876 _live_oops_moved_to->push(oop(compaction_top)); | |
2877 } | |
2878 if (RecordMarkSweepCompaction) { | |
2879 _cur_gc_live_oops->push(q); | |
2880 _cur_gc_live_oops_moved_to->push(compaction_top); | |
2881 _cur_gc_live_oops_size->push(size); | |
2882 } | |
2883 } | |
2884 | |
2885 | |
2886 void PSParallelCompact::compaction_complete() { | |
2887 if (RecordMarkSweepCompaction) { | |
2888 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
2889 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
2890 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
2891 | |
2892 _cur_gc_live_oops = _last_gc_live_oops; | |
2893 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
2894 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
2895 _last_gc_live_oops = _tmp_live_oops; | |
2896 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
2897 _last_gc_live_oops_size = _tmp_live_oops_size; | |
2898 } | |
2899 } | |
2900 | |
2901 | |
2902 void PSParallelCompact::print_new_location_of_heap_address(HeapWord* q) { | |
2903 if (!RecordMarkSweepCompaction) { | |
2904 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
2905 return; | |
2906 } | |
2907 | |
2908 if (_last_gc_live_oops == NULL) { | |
2909 tty->print_cr("No compaction information gathered yet"); | |
2910 return; | |
2911 } | |
2912 | |
2913 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
2914 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
2915 size_t sz = _last_gc_live_oops_size->at(i); | |
2916 if (old_oop <= q && q < (old_oop + sz)) { | |
2917 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
2918 size_t offset = (q - old_oop); | |
2919 tty->print_cr("Address " PTR_FORMAT, q); | |
2920 tty->print_cr(" Was in oop " PTR_FORMAT ", size %d, at offset %d", old_oop, sz, offset); | |
2921 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); | |
2922 return; | |
2923 } | |
2924 } | |
2925 | |
2926 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
2927 } | |
2928 #endif //VALIDATE_MARK_SWEEP | |
2929 | |
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2930 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2931 void |
2932 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2933 SpaceId space_id, | |
375
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2934 size_t beg_region, |
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2935 size_t end_region) { |
0 | 2936 ParallelCompactData& sd = summary_data(); |
2937 ParMarkBitMap* const mbm = mark_bitmap(); | |
2938 | |
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2939 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2940 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2941 assert(beg_region <= end_region, "bad region range"); |
0 | 2942 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2943 | |
2944 #ifdef ASSERT | |
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2945 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2946 // filled. |
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2947 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2948 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2949 } |
2950 #endif // #ifdef ASSERT | |
2951 | |
2952 if (beg_addr != space(space_id)->bottom()) { | |
2953 // Find the first live object or block of dead space that *starts* in this | |
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2954 // range of regions. If a partial object crosses onto the region, skip it; |
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2955 // it will be marked for 'deferred update' when the object head is |
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2956 // processed. If dead space crosses onto the region, it is also skipped; it |
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2957 // will be filled when the prior region is processed. If neither of those |
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2958 // apply, the first word in the region is the start of a live object or dead |
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2959 // space. |
0 | 2960 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2961 const RegionData* const cp = sd.region(beg_region); |
0 | 2962 if (cp->partial_obj_size() != 0) { |
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2963 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2964 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2965 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2966 } | |
2967 } | |
2968 | |
2969 if (beg_addr < end_addr) { | |
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2970 // A live object or block of dead space starts in this range of Regions. |
0 | 2971 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2972 | |
2973 // Create closures and iterate. | |
2974 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2975 FillClosure fill_closure(cm, space_id); | |
2976 ParMarkBitMap::IterationStatus status; | |
2977 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2978 dense_prefix_end); | |
2979 if (status == ParMarkBitMap::incomplete) { | |
2980 update_closure.do_addr(update_closure.source()); | |
2981 } | |
2982 } | |
2983 | |
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2984 // Mark the regions as filled. |
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2985 RegionData* const beg_cp = sd.region(beg_region); |
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2986 RegionData* const end_cp = sd.region(end_region); |
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2987 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2988 cp->set_completed(); |
2989 } | |
2990 } | |
2991 | |
2992 // Return the SpaceId for the space containing addr. If addr is not in the | |
2993 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2994 // in the heap and asserts such. | |
2995 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2996 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2997 | |
2998 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
2999 if (_space_info[id].space()->contains(addr)) { | |
3000 return SpaceId(id); | |
3001 } | |
3002 } | |
3003 | |
3004 assert(false, "no space contains the addr"); | |
3005 return last_space_id; | |
3006 } | |
3007 | |
3008 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
3009 SpaceId id) { | |
3010 assert(id < last_space_id, "bad space id"); | |
3011 | |
3012 ParallelCompactData& sd = summary_data(); | |
3013 const SpaceInfo* const space_info = _space_info + id; | |
3014 ObjectStartArray* const start_array = space_info->start_array(); | |
3015 | |
3016 const MutableSpace* const space = space_info->space(); | |
3017 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
3018 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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3019 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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3020 |
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3021 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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3022 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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3023 const RegionData* cur_region; |
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3024 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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3025 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 3026 if (addr != NULL) { |
3027 if (start_array != NULL) { | |
3028 start_array->allocate_block(addr); | |
3029 } | |
3030 oop(addr)->update_contents(cm); | |
3031 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
3032 } | |
3033 } | |
3034 } | |
3035 | |
3036 // Skip over count live words starting from beg, and return the address of the | |
3037 // next live word. Unless marked, the word corresponding to beg is assumed to | |
3038 // be dead. Callers must either ensure beg does not correspond to the middle of | |
3039 // an object, or account for those live words in some other way. Callers must | |
3040 // also ensure that there are enough live words in the range [beg, end) to skip. | |
3041 HeapWord* | |
3042 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
3043 { | |
3044 assert(count > 0, "sanity"); | |
3045 | |
3046 ParMarkBitMap* m = mark_bitmap(); | |
3047 idx_t bits_to_skip = m->words_to_bits(count); | |
3048 idx_t cur_beg = m->addr_to_bit(beg); | |
3049 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
3050 | |
3051 do { | |
3052 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
3053 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
3054 const size_t obj_bits = cur_end - cur_beg + 1; | |
3055 if (obj_bits > bits_to_skip) { | |
3056 return m->bit_to_addr(cur_beg + bits_to_skip); | |
3057 } | |
3058 bits_to_skip -= obj_bits; | |
3059 cur_beg = cur_end + 1; | |
3060 } while (bits_to_skip > 0); | |
3061 | |
3062 // Skipping the desired number of words landed just past the end of an object. | |
3063 // Find the start of the next object. | |
3064 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
3065 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
3066 return m->bit_to_addr(cur_beg); | |
3067 } | |
3068 | |
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3069 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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3070 SpaceId src_space_id, |
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3071 size_t src_region_idx) |
0 | 3072 { |
482
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3073 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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3074 |
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3075 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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3076 if (split_info.dest_region_addr() == dest_addr) { |
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3077 // The partial object ending at the split point contains the first word to |
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3078 // be copied to dest_addr. |
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3079 return split_info.first_src_addr(); |
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3080 } |
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3081 |
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3082 const ParallelCompactData& sd = summary_data(); |
0 | 3083 ParMarkBitMap* const bitmap = mark_bitmap(); |
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3084 const size_t RegionSize = ParallelCompactData::RegionSize; |
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3085 |
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3086 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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3087 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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3088 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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3089 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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3090 |
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3091 assert(dest_addr >= src_region_destination, "wrong src region"); |
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3092 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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3093 |
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3094 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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3095 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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3096 |
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3097 HeapWord* addr = src_region_beg; |
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3098 if (dest_addr == src_region_destination) { |
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3099 // Return the first live word in the source region. |
0 | 3100 if (partial_obj_size == 0) { |
375
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3101 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3102 assert(addr < src_region_end, "no objects start in src region"); |
0 | 3103 } |
3104 return addr; | |
3105 } | |
3106 | |
3107 // Must skip some live data. | |
375
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3108 size_t words_to_skip = dest_addr - src_region_destination; |
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3109 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 3110 |
3111 if (partial_obj_size >= words_to_skip) { | |
3112 // All the live words to skip are part of the partial object. | |
3113 addr += words_to_skip; | |
3114 if (partial_obj_size == words_to_skip) { | |
3115 // Find the first live word past the partial object. | |
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3116 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3117 assert(addr < src_region_end, "wrong src region"); |
0 | 3118 } |
3119 return addr; | |
3120 } | |
3121 | |
3122 // Skip over the partial object (if any). | |
3123 if (partial_obj_size != 0) { | |
3124 words_to_skip -= partial_obj_size; | |
3125 addr += partial_obj_size; | |
3126 } | |
3127 | |
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3128 // Skip over live words due to objects that start in the region. |
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3129 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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3130 assert(addr < src_region_end, "wrong src region"); |
0 | 3131 return addr; |
3132 } | |
3133 | |
3134 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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3135 SpaceId src_space_id, |
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3136 size_t beg_region, |
0 | 3137 HeapWord* end_addr) |
3138 { | |
3139 ParallelCompactData& sd = summary_data(); | |
495
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3140 |
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3141 #ifdef ASSERT |
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3142 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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3143 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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3144 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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3145 "src_space_id does not match beg_addr"); |
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3146 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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3147 "src_space_id does not match end_addr"); |
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3148 #endif // #ifdef ASSERT |
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3149 |
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3150 RegionData* const beg = sd.region(beg_region); |
495
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3151 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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3152 |
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3153 // Regions up to new_top() are enqueued if they become available. |
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3154 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3155 RegionData* const enqueue_end = |
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3156 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3157 |
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3158 for (RegionData* cur = beg; cur < end; ++cur) { |
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|
3159 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3160 cur->decrement_destination_count(); |
495
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3161 if (cur < enqueue_end && cur->available() && cur->claim()) { |
1638 | 3162 cm->push_region(sd.region(cur)); |
0 | 3163 } |
3164 } | |
3165 } | |
3166 | |
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3167 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3168 SpaceId& src_space_id, |
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3169 HeapWord*& src_space_top, |
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3170 HeapWord* end_addr) |
0 | 3171 { |
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3172 typedef ParallelCompactData::RegionData RegionData; |
0 | 3173 |
3174 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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3175 const size_t region_size = ParallelCompactData::RegionSize; |
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3176 |
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3177 size_t src_region_idx = 0; |
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3178 |
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3179 // Skip empty regions (if any) up to the top of the space. |
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3180 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3181 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3182 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3183 const RegionData* const top_region_ptr = |
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3184 sd.addr_to_region_ptr(top_aligned_up); |
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3185 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3186 ++src_region_ptr; |
0 | 3187 } |
3188 | |
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3189 if (src_region_ptr < top_region_ptr) { |
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3190 // The next source region is in the current space. Update src_region_idx |
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3191 // and the source address to match src_region_ptr. |
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3192 src_region_idx = sd.region(src_region_ptr); |
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3193 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3194 if (src_region_addr > closure.source()) { |
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3195 closure.set_source(src_region_addr); |
0 | 3196 } |
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3197 return src_region_idx; |
0 | 3198 } |
3199 | |
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3200 // Switch to a new source space and find the first non-empty region. |
0 | 3201 unsigned int space_id = src_space_id + 1; |
3202 assert(space_id < last_space_id, "not enough spaces"); | |
3203 | |
3204 HeapWord* const destination = closure.destination(); | |
3205 | |
3206 do { | |
3207 MutableSpace* space = _space_info[space_id].space(); | |
3208 HeapWord* const bottom = space->bottom(); | |
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3209 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3210 |
3211 // Iterate over the spaces that do not compact into themselves. | |
3212 if (bottom_cp->destination() != bottom) { | |
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3213 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3214 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3215 |
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3216 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3217 if (src_cp->live_obj_size() > 0) { |
3218 // Found it. | |
3219 assert(src_cp->destination() == destination, | |
3220 "first live obj in the space must match the destination"); | |
3221 assert(src_cp->partial_obj_size() == 0, | |
3222 "a space cannot begin with a partial obj"); | |
3223 | |
3224 src_space_id = SpaceId(space_id); | |
3225 src_space_top = space->top(); | |
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3226 const size_t src_region_idx = sd.region(src_cp); |
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3227 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3228 return src_region_idx; |
0 | 3229 } else { |
3230 assert(src_cp->data_size() == 0, "sanity"); | |
3231 } | |
3232 } | |
3233 } | |
3234 } while (++space_id < last_space_id); | |
3235 | |
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3236 assert(false, "no source region was found"); |
0 | 3237 return 0; |
3238 } | |
3239 | |
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3240 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3241 { |
3242 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
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3243 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3244 ParMarkBitMap* const bitmap = mark_bitmap(); |
3245 ParallelCompactData& sd = summary_data(); | |
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3246 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3247 |
3248 // Get the items needed to construct the closure. | |
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3249 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3250 SpaceId dest_space_id = space_id(dest_addr); |
3251 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3252 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3253 assert(dest_addr < new_top, "sanity"); | |
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3254 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3255 |
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3256 // Get the source region and related info. |
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3257 size_t src_region_idx = region_ptr->source_region(); |
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3258 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3259 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3260 | |
3261 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3262 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
375
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3263 |
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3264 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3265 // destination count is not decremented when a region is copied to itself). |
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3266 if (src_region_idx == region_idx) { |
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3267 src_region_idx += 1; |
0 | 3268 } |
3269 | |
3270 if (bitmap->is_unmarked(closure.source())) { | |
3271 // The first source word is in the middle of an object; copy the remainder | |
3272 // of the object or as much as will fit. The fact that pointer updates were | |
3273 // deferred will be noted when the object header is processed. | |
3274 HeapWord* const old_src_addr = closure.source(); | |
3275 closure.copy_partial_obj(); | |
3276 if (closure.is_full()) { | |
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3277 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3278 closure.source()); |
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3279 region_ptr->set_deferred_obj_addr(NULL); |
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3280 region_ptr->set_completed(); |
0 | 3281 return; |
3282 } | |
3283 | |
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3284 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3285 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3286 // The partial object was copied from more than one source region. |
495
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3287 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
375
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3288 |
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3289 // Move to the next source region, possibly switching spaces as well. All |
0 | 3290 // args except end_addr may be modified. |
375
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3291 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3292 end_addr); |
0 | 3293 } |
3294 } | |
3295 | |
3296 do { | |
3297 HeapWord* const cur_addr = closure.source(); | |
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3298 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3299 src_space_top); |
3300 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3301 | |
3302 if (status == ParMarkBitMap::incomplete) { | |
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3303 // The last obj that starts in the source region does not end in the |
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3304 // region. |
1489
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3305 assert(closure.source() < end_addr, "sanity"); |
0 | 3306 HeapWord* const obj_beg = closure.source(); |
3307 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3308 src_space_top); | |
3309 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3310 if (obj_end < range_end) { | |
3311 // The end was found; the entire object will fit. | |
3312 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3313 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3314 } else { | |
3315 // The end was not found; the object will not fit. | |
3316 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3317 status = ParMarkBitMap::would_overflow; | |
3318 } | |
3319 } | |
3320 | |
3321 if (status == ParMarkBitMap::would_overflow) { | |
3322 // The last object did not fit. Note that interior oop updates were | |
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3323 // deferred, then copy enough of the object to fill the region. |
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3324 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3325 status = closure.copy_until_full(); // copies from closure.source() |
3326 | |
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3327 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3328 closure.source()); |
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3329 region_ptr->set_completed(); |
0 | 3330 return; |
3331 } | |
3332 | |
3333 if (status == ParMarkBitMap::full) { | |
495
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3334 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3335 closure.source()); |
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3336 region_ptr->set_deferred_obj_addr(NULL); |
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3337 region_ptr->set_completed(); |
0 | 3338 return; |
3339 } | |
3340 | |
495
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3341 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3342 |
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3343 // Move to the next source region, possibly switching spaces as well. All |
0 | 3344 // args except end_addr may be modified. |
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3345 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3346 end_addr); |
0 | 3347 } while (true); |
3348 } | |
3349 | |
3350 void | |
3351 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3352 const MutableSpace* sp = space(space_id); | |
3353 if (sp->is_empty()) { | |
3354 return; | |
3355 } | |
3356 | |
3357 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3358 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3359 HeapWord* const dp_addr = dense_prefix(space_id); | |
3360 HeapWord* beg_addr = sp->bottom(); | |
3361 HeapWord* end_addr = sp->top(); | |
3362 | |
3363 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3364 | |
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3365 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3366 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3367 if (beg_region < dp_region) { |
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3368 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3369 } |
3370 | |
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3371 // The destination of the first live object that starts in the region is one |
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3372 // past the end of the partial object entering the region (if any). |
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3373 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3374 HeapWord* const new_top = _space_info[space_id].new_top(); |
3375 assert(new_top >= dest_addr, "bad new_top value"); | |
3376 const size_t words = pointer_delta(new_top, dest_addr); | |
3377 | |
3378 if (words > 0) { | |
3379 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3380 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3381 | |
3382 ParMarkBitMap::IterationStatus status; | |
3383 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3384 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3385 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3386 "live objects skipped because closure is full"); | |
3387 } | |
3388 } | |
3389 | |
3390 jlong PSParallelCompact::millis_since_last_gc() { | |
4712
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3391 // We need a monotonically non-deccreasing time in ms but |
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3392 // os::javaTimeMillis() does not guarantee monotonicity. |
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3393 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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3394 jlong ret_val = now - _time_of_last_gc; |
0 | 3395 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
3396 if (ret_val < 0) { | |
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3397 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 3398 return 0; |
3399 } | |
3400 return ret_val; | |
3401 } | |
3402 | |
3403 void PSParallelCompact::reset_millis_since_last_gc() { | |
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3404 // We need a monotonically non-deccreasing time in ms but |
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3405 // os::javaTimeMillis() does not guarantee monotonicity. |
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3406 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 3407 } |
3408 | |
3409 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3410 { | |
3411 if (source() != destination()) { | |
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3412 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3413 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3414 } | |
3415 update_state(words_remaining()); | |
3416 assert(is_full(), "sanity"); | |
3417 return ParMarkBitMap::full; | |
3418 } | |
3419 | |
3420 void MoveAndUpdateClosure::copy_partial_obj() | |
3421 { | |
3422 size_t words = words_remaining(); | |
3423 | |
3424 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3425 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3426 if (end_addr < range_end) { | |
3427 words = bitmap()->obj_size(source(), end_addr); | |
3428 } | |
3429 | |
3430 // This test is necessary; if omitted, the pointer updates to a partial object | |
3431 // that crosses the dense prefix boundary could be overwritten. | |
3432 if (source() != destination()) { | |
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3433 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3434 Copy::aligned_conjoint_words(source(), destination(), words); |
3435 } | |
3436 update_state(words); | |
3437 } | |
3438 | |
3439 ParMarkBitMapClosure::IterationStatus | |
3440 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3441 assert(destination() != NULL, "sanity"); | |
3442 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3443 | |
3444 _source = addr; | |
3445 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3446 destination(), "wrong destination"); | |
3447 | |
3448 if (words > words_remaining()) { | |
3449 return ParMarkBitMap::would_overflow; | |
3450 } | |
3451 | |
3452 // The start_array must be updated even if the object is not moving. | |
3453 if (_start_array != NULL) { | |
3454 _start_array->allocate_block(destination()); | |
3455 } | |
3456 | |
3457 if (destination() != source()) { | |
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3458 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3459 Copy::aligned_conjoint_words(source(), destination(), words); |
3460 } | |
3461 | |
3462 oop moved_oop = (oop) destination(); | |
3463 moved_oop->update_contents(compaction_manager()); | |
3464 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3465 | |
3466 update_state(words); | |
3467 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3468 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3469 } | |
3470 | |
3471 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3472 ParCompactionManager* cm, | |
3473 PSParallelCompact::SpaceId space_id) : | |
3474 ParMarkBitMapClosure(mbm, cm), | |
3475 _space_id(space_id), | |
3476 _start_array(PSParallelCompact::start_array(space_id)) | |
3477 { | |
3478 } | |
3479 | |
3480 // Updates the references in the object to their new values. | |
3481 ParMarkBitMapClosure::IterationStatus | |
3482 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3483 do_addr(addr); | |
3484 return ParMarkBitMap::incomplete; | |
3485 } | |
3486 | |
3487 // Prepare for compaction. This method is executed once | |
3488 // (i.e., by a single thread) before compaction. | |
3489 // Save the updated location of the intArrayKlassObj for | |
3490 // filling holes in the dense prefix. | |
3491 void PSParallelCompact::compact_prologue() { | |
3492 _updated_int_array_klass_obj = (klassOop) | |
3493 summary_data().calc_new_pointer(Universe::intArrayKlassObj()); | |
3494 } |