Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 6008:b632e80fc9dc
4988100: oop_verify_old_oop appears to be dead
Summary: removed oop_verify_old_oop and allow_dirty. Also reviewed by: alexlamsl@gmail.com
Reviewed-by: jmasa, jwilhelm
| author | brutisso |
|---|---|
| date | Mon, 16 Apr 2012 08:57:18 +0200 |
| parents | 23c0eb012d6f |
| children | d2a62e0f25eb |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 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 "gc_implementation/parallelScavenge/adjoiningGenerations.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/cardTableExtension.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/psAdaptiveSizePolicy.hpp" | |
| 33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
| 34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
| 35 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" | |
| 36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 37 #include "gc_implementation/parallelScavenge/vmPSOperations.hpp" | |
| 38 #include "memory/gcLocker.inline.hpp" | |
| 39 #include "oops/oop.inline.hpp" | |
| 40 #include "runtime/handles.inline.hpp" | |
| 41 #include "runtime/java.hpp" | |
| 42 #include "runtime/vmThread.hpp" | |
| 43 #include "utilities/vmError.hpp" | |
| 0 | 44 |
| 45 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
| 46 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
| 47 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
| 48 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
| 49 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
| 50 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
| 51 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
| 52 | |
| 53 static void trace_gen_sizes(const char* const str, | |
| 54 size_t pg_min, size_t pg_max, | |
| 55 size_t og_min, size_t og_max, | |
| 56 size_t yg_min, size_t yg_max) | |
| 57 { | |
| 58 if (TracePageSizes) { | |
| 59 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
| 60 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 61 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 62 SIZE_FORMAT, | |
| 63 str, pg_min / K, pg_max / K, | |
| 64 og_min / K, og_max / K, | |
| 65 yg_min / K, yg_max / K, | |
| 66 (pg_max + og_max + yg_max) / K); | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 jint ParallelScavengeHeap::initialize() { | |
| 1166 | 71 CollectedHeap::pre_initialize(); |
| 72 | |
| 0 | 73 // Cannot be initialized until after the flags are parsed |
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74 // GenerationSizer flag_parser; |
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75 _collector_policy = new GenerationSizer(); |
| 0 | 76 |
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77 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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78 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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79 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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80 size_t og_max_size = _collector_policy->max_old_gen_size(); |
| 0 | 81 // Why isn't there a min_perm_gen_size()? |
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82 size_t pg_min_size = _collector_policy->perm_gen_size(); |
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83 size_t pg_max_size = _collector_policy->max_perm_gen_size(); |
| 0 | 84 |
| 85 trace_gen_sizes("ps heap raw", | |
| 86 pg_min_size, pg_max_size, | |
| 87 og_min_size, og_max_size, | |
| 88 yg_min_size, yg_max_size); | |
| 89 | |
| 90 // The ReservedSpace ctor used below requires that the page size for the perm | |
| 91 // gen is <= the page size for the rest of the heap (young + old gens). | |
| 92 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
| 93 yg_max_size + og_max_size, | |
| 94 8); | |
| 95 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
| 96 pg_max_size, 16), | |
| 97 og_page_sz); | |
| 98 | |
| 99 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
| 100 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
| 101 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
| 102 | |
| 103 // Update sizes to reflect the selected page size(s). | |
| 104 // | |
| 105 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
| 106 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
| 107 // move to the common code. | |
| 108 yg_min_size = align_size_up(yg_min_size, yg_align); | |
| 109 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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110 size_t yg_cur_size = |
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111 align_size_up(_collector_policy->young_gen_size(), yg_align); |
| 0 | 112 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
| 113 | |
| 114 og_min_size = align_size_up(og_min_size, og_align); | |
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115 // Align old gen size down to preserve specified heap size. |
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116 assert(og_align == yg_align, "sanity"); |
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117 og_max_size = align_size_down(og_max_size, og_align); |
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118 og_max_size = MAX2(og_max_size, og_min_size); |
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119 size_t og_cur_size = |
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120 align_size_down(_collector_policy->old_gen_size(), og_align); |
| 0 | 121 og_cur_size = MAX2(og_cur_size, og_min_size); |
| 122 | |
| 123 pg_min_size = align_size_up(pg_min_size, pg_align); | |
| 124 pg_max_size = align_size_up(pg_max_size, pg_align); | |
| 125 size_t pg_cur_size = pg_min_size; | |
| 126 | |
| 127 trace_gen_sizes("ps heap rnd", | |
| 128 pg_min_size, pg_max_size, | |
| 129 og_min_size, og_max_size, | |
| 130 yg_min_size, yg_max_size); | |
| 131 | |
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132 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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133 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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134 |
| 0 | 135 // The main part of the heap (old gen + young gen) can often use a larger page |
| 136 // size than is needed or wanted for the perm gen. Use the "compound | |
| 137 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
| 138 // all gens. | |
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139 |
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140 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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141 og_align, addr); |
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142 |
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143 if (UseCompressedOops) { |
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144 if (addr != NULL && !heap_rs.is_reserved()) { |
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145 // Failed to reserve at specified address - the requested memory |
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146 // region is taken already, for example, by 'java' launcher. |
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147 // Try again to reserver heap higher. |
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148 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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149 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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150 og_align, addr); |
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151 if (addr != NULL && !heap_rs0.is_reserved()) { |
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152 // Failed to reserve at specified address again - give up. |
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153 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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154 assert(addr == NULL, ""); |
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155 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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156 og_align, addr); |
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157 heap_rs = heap_rs1; |
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158 } else { |
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159 heap_rs = heap_rs0; |
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160 } |
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161 } |
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162 } |
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163 |
| 0 | 164 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
| 165 heap_rs.base(), pg_max_size); | |
| 166 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
| 167 og_max_size + yg_max_size, og_page_sz, | |
| 168 heap_rs.base() + pg_max_size, | |
| 169 heap_rs.size() - pg_max_size); | |
| 170 if (!heap_rs.is_reserved()) { | |
| 171 vm_shutdown_during_initialization( | |
| 172 "Could not reserve enough space for object heap"); | |
| 173 return JNI_ENOMEM; | |
| 174 } | |
| 175 | |
| 176 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 177 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 178 | |
| 179 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 180 _barrier_set = barrier_set; | |
| 181 oopDesc::set_bs(_barrier_set); | |
| 182 if (_barrier_set == NULL) { | |
| 183 vm_shutdown_during_initialization( | |
| 184 "Could not reserve enough space for barrier set"); | |
| 185 return JNI_ENOMEM; | |
| 186 } | |
| 187 | |
| 188 // Initial young gen size is 4 Mb | |
| 189 // | |
| 190 // XXX - what about flag_parser.young_gen_size()? | |
| 191 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
| 192 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
| 193 | |
| 194 // Split the reserved space into perm gen and the main heap (everything else). | |
| 195 // The main heap uses a different alignment. | |
| 196 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
| 197 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
| 198 | |
| 199 // Make up the generations | |
| 200 // Calculate the maximum size that a generation can grow. This | |
| 201 // includes growth into the other generation. Note that the | |
| 202 // parameter _max_gen_size is kept as the maximum | |
| 203 // size of the generation as the boundaries currently stand. | |
| 204 // _max_gen_size is still used as that value. | |
| 205 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 206 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 207 | |
| 208 _gens = new AdjoiningGenerations(main_rs, | |
| 209 og_cur_size, | |
| 210 og_min_size, | |
| 211 og_max_size, | |
| 212 yg_cur_size, | |
| 213 yg_min_size, | |
| 214 yg_max_size, | |
| 215 yg_align); | |
| 216 | |
| 217 _old_gen = _gens->old_gen(); | |
| 218 _young_gen = _gens->young_gen(); | |
| 219 | |
| 220 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 221 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 222 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 223 _size_policy = | |
| 224 new PSAdaptiveSizePolicy(eden_capacity, | |
| 225 initial_promo_size, | |
| 226 young_gen()->to_space()->capacity_in_bytes(), | |
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227 intra_heap_alignment(), |
| 0 | 228 max_gc_pause_sec, |
| 229 max_gc_minor_pause_sec, | |
| 230 GCTimeRatio | |
| 231 ); | |
| 232 | |
| 233 _perm_gen = new PSPermGen(perm_rs, | |
| 234 pg_align, | |
| 235 pg_cur_size, | |
| 236 pg_cur_size, | |
| 237 pg_max_size, | |
| 238 "perm", 2); | |
| 239 | |
| 240 assert(!UseAdaptiveGCBoundary || | |
| 241 (old_gen()->virtual_space()->high_boundary() == | |
| 242 young_gen()->virtual_space()->low_boundary()), | |
| 243 "Boundaries must meet"); | |
| 244 // initialize the policy counters - 2 collectors, 3 generations | |
| 245 _gc_policy_counters = | |
| 246 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 247 _psh = this; | |
| 248 | |
| 249 // Set up the GCTaskManager | |
| 250 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 251 | |
| 252 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 253 return JNI_ENOMEM; | |
| 254 } | |
| 255 | |
| 256 return JNI_OK; | |
| 257 } | |
| 258 | |
| 259 void ParallelScavengeHeap::post_initialize() { | |
| 260 // Need to init the tenuring threshold | |
| 261 PSScavenge::initialize(); | |
| 262 if (UseParallelOldGC) { | |
| 263 PSParallelCompact::post_initialize(); | |
| 264 } else { | |
| 265 PSMarkSweep::initialize(); | |
| 266 } | |
| 267 PSPromotionManager::initialize(); | |
| 268 } | |
| 269 | |
| 270 void ParallelScavengeHeap::update_counters() { | |
| 271 young_gen()->update_counters(); | |
| 272 old_gen()->update_counters(); | |
| 273 perm_gen()->update_counters(); | |
| 274 } | |
| 275 | |
| 276 size_t ParallelScavengeHeap::capacity() const { | |
| 277 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 278 return value; | |
| 279 } | |
| 280 | |
| 281 size_t ParallelScavengeHeap::used() const { | |
| 282 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 283 return value; | |
| 284 } | |
| 285 | |
| 286 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 287 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 288 } | |
| 289 | |
| 290 | |
| 291 size_t ParallelScavengeHeap::permanent_capacity() const { | |
| 292 return perm_gen()->capacity_in_bytes(); | |
| 293 } | |
| 294 | |
| 295 size_t ParallelScavengeHeap::permanent_used() const { | |
| 296 return perm_gen()->used_in_bytes(); | |
| 297 } | |
| 298 | |
| 299 size_t ParallelScavengeHeap::max_capacity() const { | |
| 300 size_t estimated = reserved_region().byte_size(); | |
| 301 estimated -= perm_gen()->reserved().byte_size(); | |
| 302 if (UseAdaptiveSizePolicy) { | |
| 303 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 304 } else { | |
| 305 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 306 } | |
| 307 return MAX2(estimated, capacity()); | |
| 308 } | |
| 309 | |
| 310 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 311 if (young_gen()->is_in(p)) { | |
| 312 return true; | |
| 313 } | |
| 314 | |
| 315 if (old_gen()->is_in(p)) { | |
| 316 return true; | |
| 317 } | |
| 318 | |
| 319 if (perm_gen()->is_in(p)) { | |
| 320 return true; | |
| 321 } | |
| 322 | |
| 323 return false; | |
| 324 } | |
| 325 | |
| 326 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 327 if (young_gen()->is_in_reserved(p)) { | |
| 328 return true; | |
| 329 } | |
| 330 | |
| 331 if (old_gen()->is_in_reserved(p)) { | |
| 332 return true; | |
| 333 } | |
| 334 | |
| 335 if (perm_gen()->is_in_reserved(p)) { | |
| 336 return true; | |
| 337 } | |
| 338 | |
| 339 return false; | |
| 340 } | |
| 341 | |
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342 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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343 return is_in_young((oop)addr); |
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344 } |
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345 |
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346 #ifdef ASSERT |
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347 // Don't implement this by using is_in_young(). This method is used |
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348 // in some cases to check that is_in_young() is correct. |
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349 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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350 assert(is_in_reserved(p) || p == NULL, |
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351 "Does not work if address is non-null and outside of the heap"); |
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352 // The order of the generations is perm (low addr), old, young (high addr) |
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353 return p >= old_gen()->reserved().end(); |
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354 } |
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355 #endif |
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356 |
| 0 | 357 // There are two levels of allocation policy here. |
| 358 // | |
| 359 // When an allocation request fails, the requesting thread must invoke a VM | |
| 360 // operation, transfer control to the VM thread, and await the results of a | |
| 361 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 362 // multiple times if possible. | |
| 363 // | |
| 364 // To accomplish this, we have a basic allocation policy, and also a | |
| 365 // failed allocation policy. | |
| 366 // | |
| 367 // The basic allocation policy controls how you allocate memory without | |
| 368 // attempting garbage collection. It is okay to grab locks and | |
| 369 // expand the heap, if that can be done without coming to a safepoint. | |
| 370 // It is likely that the basic allocation policy will not be very | |
| 371 // aggressive. | |
| 372 // | |
| 373 // The failed allocation policy is invoked from the VM thread after | |
| 374 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 375 // request. This policy needs to cover the entire range of collection, | |
| 376 // heap expansion, and out-of-memory conditions. It should make every | |
| 377 // attempt to allocate the requested memory. | |
| 378 | |
| 379 // Basic allocation policy. Should never be called at a safepoint, or | |
| 380 // from the VM thread. | |
| 381 // | |
| 382 // This method must handle cases where many mem_allocate requests fail | |
| 383 // simultaneously. When that happens, only one VM operation will succeed, | |
| 384 // and the rest will not be executed. For that reason, this method loops | |
| 385 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 386 // we rely on the size_policy object to force a bail out. | |
| 387 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 388 size_t size, | |
| 389 bool* gc_overhead_limit_was_exceeded) { | |
| 390 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 391 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 392 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 393 | |
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394 // In general gc_overhead_limit_was_exceeded should be false so |
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395 // set it so here and reset it to true only if the gc time |
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396 // limit is being exceeded as checked below. |
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397 *gc_overhead_limit_was_exceeded = false; |
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398 |
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399 HeapWord* result = young_gen()->allocate(size); |
| 0 | 400 |
| 401 uint loop_count = 0; | |
| 402 uint gc_count = 0; | |
| 403 | |
| 404 while (result == NULL) { | |
| 405 // We don't want to have multiple collections for a single filled generation. | |
| 406 // To prevent this, each thread tracks the total_collections() value, and if | |
| 407 // the count has changed, does not do a new collection. | |
| 408 // | |
| 409 // The collection count must be read only while holding the heap lock. VM | |
| 410 // operations also hold the heap lock during collections. There is a lock | |
| 411 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 412 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 413 // the collection count has already changed. To prevent duplicate collections, | |
| 414 // The policy MUST attempt allocations during the same period it reads the | |
| 415 // total_collections() value! | |
| 416 { | |
| 417 MutexLocker ml(Heap_lock); | |
| 418 gc_count = Universe::heap()->total_collections(); | |
| 419 | |
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420 result = young_gen()->allocate(size); |
| 0 | 421 if (result != NULL) { |
| 422 return result; | |
| 423 } | |
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424 |
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425 // If certain conditions hold, try allocating from the old gen. |
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426 result = mem_allocate_old_gen(size); |
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427 if (result != NULL) { |
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428 return result; |
| 0 | 429 } |
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430 |
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431 // Failed to allocate without a gc. |
| 0 | 432 if (GC_locker::is_active_and_needs_gc()) { |
| 433 // If this thread is not in a jni critical section, we stall | |
| 434 // the requestor until the critical section has cleared and | |
| 435 // GC allowed. When the critical section clears, a GC is | |
| 436 // initiated by the last thread exiting the critical section; so | |
| 437 // we retry the allocation sequence from the beginning of the loop, | |
| 438 // rather than causing more, now probably unnecessary, GC attempts. | |
| 439 JavaThread* jthr = JavaThread::current(); | |
| 440 if (!jthr->in_critical()) { | |
| 441 MutexUnlocker mul(Heap_lock); | |
| 442 GC_locker::stall_until_clear(); | |
| 443 continue; | |
| 444 } else { | |
| 445 if (CheckJNICalls) { | |
| 446 fatal("Possible deadlock due to allocating while" | |
| 447 " in jni critical section"); | |
| 448 } | |
| 449 return NULL; | |
| 450 } | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 if (result == NULL) { | |
| 455 // Generate a VM operation | |
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456 VM_ParallelGCFailedAllocation op(size, gc_count); |
| 0 | 457 VMThread::execute(&op); |
| 458 | |
| 459 // Did the VM operation execute? If so, return the result directly. | |
| 460 // This prevents us from looping until time out on requests that can | |
| 461 // not be satisfied. | |
| 462 if (op.prologue_succeeded()) { | |
| 463 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 464 "result not in heap"); | |
| 465 | |
| 466 // If GC was locked out during VM operation then retry allocation | |
| 467 // and/or stall as necessary. | |
| 468 if (op.gc_locked()) { | |
| 469 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 470 continue; // retry and/or stall as necessary | |
| 471 } | |
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472 |
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473 // Exit the loop if the gc time limit has been exceeded. |
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474 // The allocation must have failed above ("result" guarding |
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475 // this path is NULL) and the most recent collection has exceeded the |
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476 // gc overhead limit (although enough may have been collected to |
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477 // satisfy the allocation). Exit the loop so that an out-of-memory |
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478 // will be thrown (return a NULL ignoring the contents of |
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479 // op.result()), |
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480 // but clear gc_overhead_limit_exceeded so that the next collection |
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481 // starts with a clean slate (i.e., forgets about previous overhead |
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482 // excesses). Fill op.result() with a filler object so that the |
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483 // heap remains parsable. |
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484 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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485 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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486 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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487 if (limit_exceeded && softrefs_clear) { |
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488 *gc_overhead_limit_was_exceeded = true; |
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489 size_policy()->set_gc_overhead_limit_exceeded(false); |
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490 if (PrintGCDetails && Verbose) { |
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491 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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492 "return NULL because gc_overhead_limit_exceeded is set"); |
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493 } |
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494 if (op.result() != NULL) { |
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495 CollectedHeap::fill_with_object(op.result(), size); |
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496 } |
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497 return NULL; |
| 0 | 498 } |
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499 |
| 0 | 500 return op.result(); |
| 501 } | |
| 502 } | |
| 503 | |
| 504 // The policy object will prevent us from looping forever. If the | |
| 505 // time spent in gc crosses a threshold, we will bail out. | |
| 506 loop_count++; | |
| 507 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 508 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 509 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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510 " size=%d", loop_count, size); |
| 0 | 511 } |
| 512 } | |
| 513 | |
| 514 return result; | |
| 515 } | |
| 516 | |
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517 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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518 // done before each allocation, and after the full gc the allocation still |
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519 // cannot be satisfied from the young gen. This routine detects that condition; |
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520 // it should be called after a full gc has been done and the allocation |
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521 // attempted from the young gen. The parameter 'addr' should be the result of |
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522 // that young gen allocation attempt. |
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523 void |
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524 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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525 if (addr != NULL) { |
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526 _death_march_count = 0; // death march has ended |
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527 } else if (_death_march_count == 0) { |
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528 if (should_alloc_in_eden(size)) { |
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529 _death_march_count = 1; // death march has started |
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530 } |
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531 } |
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532 } |
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533 |
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534 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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535 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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536 // Size is too big for eden, or gc is locked out. |
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537 return old_gen()->allocate(size); |
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538 } |
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539 |
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540 // If a "death march" is in progress, allocate from the old gen a limited |
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541 // number of times before doing a GC. |
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542 if (_death_march_count > 0) { |
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543 if (_death_march_count < 64) { |
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544 ++_death_march_count; |
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545 return old_gen()->allocate(size); |
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546 } else { |
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547 _death_march_count = 0; |
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548 } |
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549 } |
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550 return NULL; |
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551 } |
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552 |
| 0 | 553 // Failed allocation policy. Must be called from the VM thread, and |
| 554 // only at a safepoint! Note that this method has policy for allocation | |
| 555 // flow, and NOT collection policy. So we do not check for gc collection | |
| 556 // time over limit here, that is the responsibility of the heap specific | |
| 557 // collection methods. This method decides where to attempt allocations, | |
| 558 // and when to attempt collections, but no collection specific policy. | |
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559 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
| 0 | 560 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 561 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 562 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 563 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 564 | |
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565 // We assume that allocation in eden will fail unless we collect. |
| 0 | 566 |
| 567 // First level allocation failure, scavenge and allocate in young gen. | |
| 568 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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569 const bool invoked_full_gc = PSScavenge::invoke(); |
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570 HeapWord* result = young_gen()->allocate(size); |
| 0 | 571 |
| 572 // Second level allocation failure. | |
| 573 // Mark sweep and allocate in young generation. | |
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574 if (result == NULL && !invoked_full_gc) { |
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575 invoke_full_gc(false); |
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576 result = young_gen()->allocate(size); |
| 0 | 577 } |
| 578 | |
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579 death_march_check(result, size); |
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580 |
| 0 | 581 // Third level allocation failure. |
| 582 // After mark sweep and young generation allocation failure, | |
| 583 // allocate in old generation. | |
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584 if (result == NULL) { |
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585 result = old_gen()->allocate(size); |
| 0 | 586 } |
| 587 | |
| 588 // Fourth level allocation failure. We're running out of memory. | |
| 589 // More complete mark sweep and allocate in young generation. | |
| 590 if (result == NULL) { | |
| 591 invoke_full_gc(true); | |
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592 result = young_gen()->allocate(size); |
| 0 | 593 } |
| 594 | |
| 595 // Fifth level allocation failure. | |
| 596 // After more complete mark sweep, allocate in old generation. | |
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597 if (result == NULL) { |
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598 result = old_gen()->allocate(size); |
| 0 | 599 } |
| 600 | |
| 601 return result; | |
| 602 } | |
| 603 | |
| 604 // | |
| 605 // This is the policy loop for allocating in the permanent generation. | |
| 606 // If the initial allocation fails, we create a vm operation which will | |
| 607 // cause a collection. | |
| 608 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
| 609 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 610 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 611 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 612 | |
| 613 HeapWord* result; | |
| 614 | |
| 615 uint loop_count = 0; | |
| 616 uint gc_count = 0; | |
| 617 uint full_gc_count = 0; | |
| 618 | |
| 619 do { | |
| 620 // We don't want to have multiple collections for a single filled generation. | |
| 621 // To prevent this, each thread tracks the total_collections() value, and if | |
| 622 // the count has changed, does not do a new collection. | |
| 623 // | |
| 624 // The collection count must be read only while holding the heap lock. VM | |
| 625 // operations also hold the heap lock during collections. There is a lock | |
| 626 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 627 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 628 // the collection count has already changed. To prevent duplicate collections, | |
| 629 // The policy MUST attempt allocations during the same period it reads the | |
| 630 // total_collections() value! | |
| 631 { | |
| 632 MutexLocker ml(Heap_lock); | |
| 633 gc_count = Universe::heap()->total_collections(); | |
| 634 full_gc_count = Universe::heap()->total_full_collections(); | |
| 635 | |
| 636 result = perm_gen()->allocate_permanent(size); | |
|
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637 |
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638 if (result != NULL) { |
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639 return result; |
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640 } |
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641 |
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642 if (GC_locker::is_active_and_needs_gc()) { |
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643 // If this thread is not in a jni critical section, we stall |
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644 // the requestor until the critical section has cleared and |
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645 // GC allowed. When the critical section clears, a GC is |
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646 // initiated by the last thread exiting the critical section; so |
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647 // we retry the allocation sequence from the beginning of the loop, |
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648 // rather than causing more, now probably unnecessary, GC attempts. |
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649 JavaThread* jthr = JavaThread::current(); |
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650 if (!jthr->in_critical()) { |
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651 MutexUnlocker mul(Heap_lock); |
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652 GC_locker::stall_until_clear(); |
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653 continue; |
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654 } else { |
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655 if (CheckJNICalls) { |
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656 fatal("Possible deadlock due to allocating while" |
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657 " in jni critical section"); |
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658 } |
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659 return NULL; |
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660 } |
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661 } |
| 0 | 662 } |
| 663 | |
| 664 if (result == NULL) { | |
| 665 | |
| 666 // Exit the loop if the gc time limit has been exceeded. | |
| 667 // The allocation must have failed above (result must be NULL), | |
| 668 // and the most recent collection must have exceeded the | |
| 669 // gc time limit. Exit the loop so that an out-of-memory | |
| 670 // will be thrown (returning a NULL will do that), but | |
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671 // clear gc_overhead_limit_exceeded so that the next collection |
| 0 | 672 // will succeeded if the applications decides to handle the |
| 673 // out-of-memory and tries to go on. | |
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674 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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675 if (limit_exceeded) { |
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676 size_policy()->set_gc_overhead_limit_exceeded(false); |
| 0 | 677 if (PrintGCDetails && Verbose) { |
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678 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate:" |
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679 " return NULL because gc_overhead_limit_exceeded is set"); |
| 0 | 680 } |
| 681 assert(result == NULL, "Allocation did not fail"); | |
| 682 return NULL; | |
| 683 } | |
| 684 | |
| 685 // Generate a VM operation | |
| 686 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
| 687 VMThread::execute(&op); | |
| 688 | |
| 689 // Did the VM operation execute? If so, return the result directly. | |
| 690 // This prevents us from looping until time out on requests that can | |
| 691 // not be satisfied. | |
| 692 if (op.prologue_succeeded()) { | |
| 693 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
| 694 "result not in heap"); | |
|
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695 // If GC was locked out during VM operation then retry allocation |
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696 // and/or stall as necessary. |
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697 if (op.gc_locked()) { |
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698 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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699 continue; // retry and/or stall as necessary |
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700 } |
| 0 | 701 // If a NULL results is being returned, an out-of-memory |
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702 // will be thrown now. Clear the gc_overhead_limit_exceeded |
| 0 | 703 // flag to avoid the following situation. |
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704 // gc_overhead_limit_exceeded is set during a collection |
| 0 | 705 // the collection fails to return enough space and an OOM is thrown |
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706 // a subsequent GC prematurely throws an out-of-memory because |
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707 // the gc_overhead_limit_exceeded counts did not start |
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708 // again from 0. |
| 0 | 709 if (op.result() == NULL) { |
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710 size_policy()->reset_gc_overhead_limit_count(); |
| 0 | 711 } |
| 712 return op.result(); | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 // The policy object will prevent us from looping forever. If the | |
| 717 // time spent in gc crosses a threshold, we will bail out. | |
| 718 loop_count++; | |
| 719 if ((QueuedAllocationWarningCount > 0) && | |
| 720 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 721 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
| 722 " size=%d", loop_count, size); | |
| 723 } | |
| 724 } while (result == NULL); | |
| 725 | |
| 726 return result; | |
| 727 } | |
| 728 | |
| 729 // | |
| 730 // This is the policy code for permanent allocations which have failed | |
| 731 // and require a collection. Note that just as in failed_mem_allocate, | |
| 732 // we do not set collection policy, only where & when to allocate and | |
| 733 // collect. | |
| 734 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
| 735 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 736 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 737 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 738 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 739 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
| 740 | |
| 741 // We assume (and assert!) that an allocation at this point will fail | |
| 742 // unless we collect. | |
| 743 | |
| 744 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
| 745 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
| 746 invoke_full_gc(false); | |
| 747 HeapWord* result = perm_gen()->allocate_permanent(size); | |
| 748 | |
| 749 // Second level allocation failure. We're running out of memory. | |
| 750 if (result == NULL) { | |
| 751 invoke_full_gc(true); | |
| 752 result = perm_gen()->allocate_permanent(size); | |
| 753 } | |
| 754 | |
| 755 return result; | |
| 756 } | |
| 757 | |
| 758 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 759 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 760 young_gen()->eden_space()->ensure_parsability(); | |
| 761 } | |
| 762 | |
| 763 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 764 return young_gen()->eden_space()->free_in_bytes(); | |
| 765 } | |
| 766 | |
| 767 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 768 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 769 } | |
| 770 | |
| 771 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 772 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 773 } | |
| 774 | |
| 775 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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776 return young_gen()->allocate(size); |
| 0 | 777 } |
| 778 | |
| 779 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 780 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 781 } | |
| 782 | |
| 783 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 784 CollectedHeap::resize_all_tlabs(); | |
| 785 } | |
| 786 | |
|
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787 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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788 // We don't need barriers for stores to objects in the |
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789 // young gen and, a fortiori, for initializing stores to |
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790 // objects therein. |
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791 return is_in_young(new_obj); |
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792 } |
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793 |
| 0 | 794 // This method is used by System.gc() and JVMTI. |
| 795 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 796 assert(!Heap_lock->owned_by_self(), | |
| 797 "this thread should not own the Heap_lock"); | |
| 798 | |
| 799 unsigned int gc_count = 0; | |
| 800 unsigned int full_gc_count = 0; | |
| 801 { | |
| 802 MutexLocker ml(Heap_lock); | |
| 803 // This value is guarded by the Heap_lock | |
| 804 gc_count = Universe::heap()->total_collections(); | |
| 805 full_gc_count = Universe::heap()->total_full_collections(); | |
| 806 } | |
| 807 | |
| 808 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 809 VMThread::execute(&op); | |
| 810 } | |
| 811 | |
| 812 // This interface assumes that it's being called by the | |
| 813 // vm thread. It collects the heap assuming that the | |
| 814 // heap lock is already held and that we are executing in | |
| 815 // the context of the vm thread. | |
| 816 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 817 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 818 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 819 GCCauseSetter gcs(this, cause); | |
| 820 switch (cause) { | |
| 821 case GCCause::_heap_inspection: | |
| 822 case GCCause::_heap_dump: { | |
| 823 HandleMark hm; | |
| 824 invoke_full_gc(false); | |
| 825 break; | |
| 826 } | |
| 827 default: // XXX FIX ME | |
| 828 ShouldNotReachHere(); | |
| 829 } | |
| 830 } | |
| 831 | |
| 832 | |
| 833 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
| 834 Unimplemented(); | |
| 835 } | |
| 836 | |
| 837 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 838 young_gen()->object_iterate(cl); | |
| 839 old_gen()->object_iterate(cl); | |
| 840 perm_gen()->object_iterate(cl); | |
| 841 } | |
| 842 | |
| 843 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
| 844 Unimplemented(); | |
| 845 } | |
| 846 | |
| 847 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
| 848 perm_gen()->object_iterate(cl); | |
| 849 } | |
| 850 | |
| 851 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 852 if (young_gen()->is_in_reserved(addr)) { | |
| 853 assert(young_gen()->is_in(addr), | |
| 854 "addr should be in allocated part of young gen"); | |
| 1907 | 855 // called from os::print_location by find or VMError |
| 856 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
| 0 | 857 Unimplemented(); |
| 858 } else if (old_gen()->is_in_reserved(addr)) { | |
| 859 assert(old_gen()->is_in(addr), | |
| 860 "addr should be in allocated part of old gen"); | |
| 861 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 862 } else if (perm_gen()->is_in_reserved(addr)) { | |
| 863 assert(perm_gen()->is_in(addr), | |
| 864 "addr should be in allocated part of perm gen"); | |
| 865 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
| 866 } | |
| 867 return 0; | |
| 868 } | |
| 869 | |
| 870 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 871 return oop(addr)->size(); | |
| 872 } | |
| 873 | |
| 874 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 875 return block_start(addr) == addr; | |
| 876 } | |
| 877 | |
| 878 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 879 return UseParallelOldGC ? | |
| 880 PSParallelCompact::millis_since_last_gc() : | |
| 881 PSMarkSweep::millis_since_last_gc(); | |
| 882 } | |
| 883 | |
| 884 void ParallelScavengeHeap::prepare_for_verify() { | |
| 885 ensure_parsability(false); // no need to retire TLABs for verification | |
| 886 } | |
| 887 | |
| 888 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
| 889 young_gen()->print_on(st); | |
| 890 old_gen()->print_on(st); | |
| 891 perm_gen()->print_on(st); | |
| 892 } | |
| 893 | |
| 894 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 895 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 896 } | |
| 897 | |
| 898 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 899 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 900 } | |
| 901 | |
| 902 void ParallelScavengeHeap::print_tracing_info() const { | |
| 903 if (TraceGen0Time) { | |
| 904 double time = PSScavenge::accumulated_time()->seconds(); | |
| 905 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 906 } | |
| 907 if (TraceGen1Time) { | |
| 908 double time = PSMarkSweep::accumulated_time()->seconds(); | |
| 909 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
| 910 } | |
| 911 } | |
| 912 | |
| 913 | |
| 6008 | 914 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 915 // Why do we need the total_collections()-filter below? |
| 916 if (total_collections() > 0) { | |
| 917 if (!silent) { | |
| 918 gclog_or_tty->print("permanent "); | |
| 919 } | |
| 6008 | 920 perm_gen()->verify(); |
| 0 | 921 |
| 922 if (!silent) { | |
| 923 gclog_or_tty->print("tenured "); | |
| 924 } | |
| 6008 | 925 old_gen()->verify(); |
| 0 | 926 |
| 927 if (!silent) { | |
| 928 gclog_or_tty->print("eden "); | |
| 929 } | |
| 6008 | 930 young_gen()->verify(); |
| 0 | 931 } |
| 932 } | |
| 933 | |
| 934 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 935 if (PrintGCDetails && Verbose) { | |
| 936 gclog_or_tty->print(" " SIZE_FORMAT | |
| 937 "->" SIZE_FORMAT | |
| 938 "(" SIZE_FORMAT ")", | |
| 939 prev_used, used(), capacity()); | |
| 940 } else { | |
| 941 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 942 "->" SIZE_FORMAT "K" | |
| 943 "(" SIZE_FORMAT "K)", | |
| 944 prev_used / K, used() / K, capacity() / K); | |
| 945 } | |
| 946 } | |
| 947 | |
| 948 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
| 949 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 950 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 951 return _psh; | |
| 952 } | |
| 953 | |
| 954 // Before delegating the resize to the young generation, | |
| 955 // the reserved space for the young and old generations | |
| 956 // may be changed to accomodate the desired resize. | |
| 957 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 958 size_t survivor_size) { | |
| 959 if (UseAdaptiveGCBoundary) { | |
| 960 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 961 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 962 return; // The generation changed size already. | |
| 963 } | |
| 964 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 965 } | |
| 966 | |
| 967 // Delegate the resize to the generation. | |
| 968 _young_gen->resize(eden_size, survivor_size); | |
| 969 } | |
| 970 | |
| 971 // Before delegating the resize to the old generation, | |
| 972 // the reserved space for the young and old generations | |
| 973 // may be changed to accomodate the desired resize. | |
| 974 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 975 if (UseAdaptiveGCBoundary) { | |
| 976 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 977 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 978 return; // The generation changed size already. | |
| 979 } | |
| 980 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 981 } | |
| 982 | |
| 983 // Delegate the resize to the generation. | |
| 984 _old_gen->resize(desired_free_space); | |
| 985 } | |
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986 |
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987 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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988 // nothing particular |
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989 } |
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990 |
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991 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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992 // nothing particular |
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993 } |
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994 |
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995 #ifndef PRODUCT |
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996 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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997 if (ZapUnusedHeapArea) { |
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998 young_gen()->record_spaces_top(); |
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999 old_gen()->record_spaces_top(); |
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1000 perm_gen()->record_spaces_top(); |
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1001 } |
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1002 } |
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1003 |
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1004 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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1005 if (ZapUnusedHeapArea) { |
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1006 young_gen()->eden_space()->mangle_unused_area(); |
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1007 young_gen()->to_space()->mangle_unused_area(); |
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1008 young_gen()->from_space()->mangle_unused_area(); |
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1009 old_gen()->object_space()->mangle_unused_area(); |
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1010 perm_gen()->object_space()->mangle_unused_area(); |
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1011 } |
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1012 } |
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1013 #endif |