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annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 0bfd3fb24150 |
| children | 1e9a9d2e6509 |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_parallelScavengeHeap.cpp.incl" | |
| 27 | |
| 28 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
| 29 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
| 30 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
| 31 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
| 32 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
| 33 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
| 34 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
| 35 | |
| 36 static void trace_gen_sizes(const char* const str, | |
| 37 size_t pg_min, size_t pg_max, | |
| 38 size_t og_min, size_t og_max, | |
| 39 size_t yg_min, size_t yg_max) | |
| 40 { | |
| 41 if (TracePageSizes) { | |
| 42 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
| 43 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 44 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 45 SIZE_FORMAT, | |
| 46 str, pg_min / K, pg_max / K, | |
| 47 og_min / K, og_max / K, | |
| 48 yg_min / K, yg_max / K, | |
| 49 (pg_max + og_max + yg_max) / K); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 jint ParallelScavengeHeap::initialize() { | |
| 1166 | 54 CollectedHeap::pre_initialize(); |
| 55 | |
| 0 | 56 // Cannot be initialized until after the flags are parsed |
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57 // GenerationSizer flag_parser; |
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58 _collector_policy = new GenerationSizer(); |
| 0 | 59 |
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60 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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61 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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62 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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63 size_t og_max_size = _collector_policy->max_old_gen_size(); |
| 0 | 64 // Why isn't there a min_perm_gen_size()? |
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65 size_t pg_min_size = _collector_policy->perm_gen_size(); |
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66 size_t pg_max_size = _collector_policy->max_perm_gen_size(); |
| 0 | 67 |
| 68 trace_gen_sizes("ps heap raw", | |
| 69 pg_min_size, pg_max_size, | |
| 70 og_min_size, og_max_size, | |
| 71 yg_min_size, yg_max_size); | |
| 72 | |
| 73 // The ReservedSpace ctor used below requires that the page size for the perm | |
| 74 // gen is <= the page size for the rest of the heap (young + old gens). | |
| 75 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
| 76 yg_max_size + og_max_size, | |
| 77 8); | |
| 78 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
| 79 pg_max_size, 16), | |
| 80 og_page_sz); | |
| 81 | |
| 82 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
| 83 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
| 84 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
| 85 | |
| 86 // Update sizes to reflect the selected page size(s). | |
| 87 // | |
| 88 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
| 89 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
| 90 // move to the common code. | |
| 91 yg_min_size = align_size_up(yg_min_size, yg_align); | |
| 92 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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93 size_t yg_cur_size = |
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94 align_size_up(_collector_policy->young_gen_size(), yg_align); |
| 0 | 95 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
| 96 | |
| 97 og_min_size = align_size_up(og_min_size, og_align); | |
| 98 og_max_size = align_size_up(og_max_size, og_align); | |
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99 size_t og_cur_size = |
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100 align_size_up(_collector_policy->old_gen_size(), og_align); |
| 0 | 101 og_cur_size = MAX2(og_cur_size, og_min_size); |
| 102 | |
| 103 pg_min_size = align_size_up(pg_min_size, pg_align); | |
| 104 pg_max_size = align_size_up(pg_max_size, pg_align); | |
| 105 size_t pg_cur_size = pg_min_size; | |
| 106 | |
| 107 trace_gen_sizes("ps heap rnd", | |
| 108 pg_min_size, pg_max_size, | |
| 109 og_min_size, og_max_size, | |
| 110 yg_min_size, yg_max_size); | |
| 111 | |
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112 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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113 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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114 |
| 0 | 115 // The main part of the heap (old gen + young gen) can often use a larger page |
| 116 // size than is needed or wanted for the perm gen. Use the "compound | |
| 117 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
| 118 // all gens. | |
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119 |
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120 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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121 og_align, addr); |
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122 |
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123 if (UseCompressedOops) { |
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124 if (addr != NULL && !heap_rs.is_reserved()) { |
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125 // Failed to reserve at specified address - the requested memory |
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126 // region is taken already, for example, by 'java' launcher. |
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127 // Try again to reserver heap higher. |
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128 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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129 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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130 og_align, addr); |
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131 if (addr != NULL && !heap_rs0.is_reserved()) { |
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132 // Failed to reserve at specified address again - give up. |
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133 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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134 assert(addr == NULL, ""); |
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135 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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136 og_align, addr); |
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137 heap_rs = heap_rs1; |
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138 } else { |
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139 heap_rs = heap_rs0; |
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140 } |
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141 } |
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142 } |
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143 |
| 0 | 144 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
| 145 heap_rs.base(), pg_max_size); | |
| 146 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
| 147 og_max_size + yg_max_size, og_page_sz, | |
| 148 heap_rs.base() + pg_max_size, | |
| 149 heap_rs.size() - pg_max_size); | |
| 150 if (!heap_rs.is_reserved()) { | |
| 151 vm_shutdown_during_initialization( | |
| 152 "Could not reserve enough space for object heap"); | |
| 153 return JNI_ENOMEM; | |
| 154 } | |
| 155 | |
| 156 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 157 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 158 | |
| 159 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 160 _barrier_set = barrier_set; | |
| 161 oopDesc::set_bs(_barrier_set); | |
| 162 if (_barrier_set == NULL) { | |
| 163 vm_shutdown_during_initialization( | |
| 164 "Could not reserve enough space for barrier set"); | |
| 165 return JNI_ENOMEM; | |
| 166 } | |
| 167 | |
| 168 // Initial young gen size is 4 Mb | |
| 169 // | |
| 170 // XXX - what about flag_parser.young_gen_size()? | |
| 171 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
| 172 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
| 173 | |
| 174 // Split the reserved space into perm gen and the main heap (everything else). | |
| 175 // The main heap uses a different alignment. | |
| 176 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
| 177 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
| 178 | |
| 179 // Make up the generations | |
| 180 // Calculate the maximum size that a generation can grow. This | |
| 181 // includes growth into the other generation. Note that the | |
| 182 // parameter _max_gen_size is kept as the maximum | |
| 183 // size of the generation as the boundaries currently stand. | |
| 184 // _max_gen_size is still used as that value. | |
| 185 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 186 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 187 | |
| 188 _gens = new AdjoiningGenerations(main_rs, | |
| 189 og_cur_size, | |
| 190 og_min_size, | |
| 191 og_max_size, | |
| 192 yg_cur_size, | |
| 193 yg_min_size, | |
| 194 yg_max_size, | |
| 195 yg_align); | |
| 196 | |
| 197 _old_gen = _gens->old_gen(); | |
| 198 _young_gen = _gens->young_gen(); | |
| 199 | |
| 200 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 201 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 202 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 203 _size_policy = | |
| 204 new PSAdaptiveSizePolicy(eden_capacity, | |
| 205 initial_promo_size, | |
| 206 young_gen()->to_space()->capacity_in_bytes(), | |
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207 intra_heap_alignment(), |
| 0 | 208 max_gc_pause_sec, |
| 209 max_gc_minor_pause_sec, | |
| 210 GCTimeRatio | |
| 211 ); | |
| 212 | |
| 213 _perm_gen = new PSPermGen(perm_rs, | |
| 214 pg_align, | |
| 215 pg_cur_size, | |
| 216 pg_cur_size, | |
| 217 pg_max_size, | |
| 218 "perm", 2); | |
| 219 | |
| 220 assert(!UseAdaptiveGCBoundary || | |
| 221 (old_gen()->virtual_space()->high_boundary() == | |
| 222 young_gen()->virtual_space()->low_boundary()), | |
| 223 "Boundaries must meet"); | |
| 224 // initialize the policy counters - 2 collectors, 3 generations | |
| 225 _gc_policy_counters = | |
| 226 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 227 _psh = this; | |
| 228 | |
| 229 // Set up the GCTaskManager | |
| 230 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 231 | |
| 232 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 233 return JNI_ENOMEM; | |
| 234 } | |
| 235 | |
| 236 return JNI_OK; | |
| 237 } | |
| 238 | |
| 239 void ParallelScavengeHeap::post_initialize() { | |
| 240 // Need to init the tenuring threshold | |
| 241 PSScavenge::initialize(); | |
| 242 if (UseParallelOldGC) { | |
| 243 PSParallelCompact::post_initialize(); | |
| 244 } else { | |
| 245 PSMarkSweep::initialize(); | |
| 246 } | |
| 247 PSPromotionManager::initialize(); | |
| 248 } | |
| 249 | |
| 250 void ParallelScavengeHeap::update_counters() { | |
| 251 young_gen()->update_counters(); | |
| 252 old_gen()->update_counters(); | |
| 253 perm_gen()->update_counters(); | |
| 254 } | |
| 255 | |
| 256 size_t ParallelScavengeHeap::capacity() const { | |
| 257 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 258 return value; | |
| 259 } | |
| 260 | |
| 261 size_t ParallelScavengeHeap::used() const { | |
| 262 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 263 return value; | |
| 264 } | |
| 265 | |
| 266 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 267 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 268 } | |
| 269 | |
| 270 | |
| 271 size_t ParallelScavengeHeap::permanent_capacity() const { | |
| 272 return perm_gen()->capacity_in_bytes(); | |
| 273 } | |
| 274 | |
| 275 size_t ParallelScavengeHeap::permanent_used() const { | |
| 276 return perm_gen()->used_in_bytes(); | |
| 277 } | |
| 278 | |
| 279 size_t ParallelScavengeHeap::max_capacity() const { | |
| 280 size_t estimated = reserved_region().byte_size(); | |
| 281 estimated -= perm_gen()->reserved().byte_size(); | |
| 282 if (UseAdaptiveSizePolicy) { | |
| 283 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 284 } else { | |
| 285 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 286 } | |
| 287 return MAX2(estimated, capacity()); | |
| 288 } | |
| 289 | |
| 290 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 291 if (young_gen()->is_in(p)) { | |
| 292 return true; | |
| 293 } | |
| 294 | |
| 295 if (old_gen()->is_in(p)) { | |
| 296 return true; | |
| 297 } | |
| 298 | |
| 299 if (perm_gen()->is_in(p)) { | |
| 300 return true; | |
| 301 } | |
| 302 | |
| 303 return false; | |
| 304 } | |
| 305 | |
| 306 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 307 if (young_gen()->is_in_reserved(p)) { | |
| 308 return true; | |
| 309 } | |
| 310 | |
| 311 if (old_gen()->is_in_reserved(p)) { | |
| 312 return true; | |
| 313 } | |
| 314 | |
| 315 if (perm_gen()->is_in_reserved(p)) { | |
| 316 return true; | |
| 317 } | |
| 318 | |
| 319 return false; | |
| 320 } | |
| 321 | |
| 322 // There are two levels of allocation policy here. | |
| 323 // | |
| 324 // When an allocation request fails, the requesting thread must invoke a VM | |
| 325 // operation, transfer control to the VM thread, and await the results of a | |
| 326 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 327 // multiple times if possible. | |
| 328 // | |
| 329 // To accomplish this, we have a basic allocation policy, and also a | |
| 330 // failed allocation policy. | |
| 331 // | |
| 332 // The basic allocation policy controls how you allocate memory without | |
| 333 // attempting garbage collection. It is okay to grab locks and | |
| 334 // expand the heap, if that can be done without coming to a safepoint. | |
| 335 // It is likely that the basic allocation policy will not be very | |
| 336 // aggressive. | |
| 337 // | |
| 338 // The failed allocation policy is invoked from the VM thread after | |
| 339 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 340 // request. This policy needs to cover the entire range of collection, | |
| 341 // heap expansion, and out-of-memory conditions. It should make every | |
| 342 // attempt to allocate the requested memory. | |
| 343 | |
| 344 // Basic allocation policy. Should never be called at a safepoint, or | |
| 345 // from the VM thread. | |
| 346 // | |
| 347 // This method must handle cases where many mem_allocate requests fail | |
| 348 // simultaneously. When that happens, only one VM operation will succeed, | |
| 349 // and the rest will not be executed. For that reason, this method loops | |
| 350 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 351 // we rely on the size_policy object to force a bail out. | |
| 352 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 353 size_t size, | |
| 354 bool is_noref, | |
| 355 bool is_tlab, | |
| 356 bool* gc_overhead_limit_was_exceeded) { | |
| 357 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 358 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 359 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 360 | |
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361 // In general gc_overhead_limit_was_exceeded should be false so |
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362 // set it so here and reset it to true only if the gc time |
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363 // limit is being exceeded as checked below. |
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364 *gc_overhead_limit_was_exceeded = false; |
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365 |
| 0 | 366 HeapWord* result = young_gen()->allocate(size, is_tlab); |
| 367 | |
| 368 uint loop_count = 0; | |
| 369 uint gc_count = 0; | |
| 370 | |
| 371 while (result == NULL) { | |
| 372 // We don't want to have multiple collections for a single filled generation. | |
| 373 // To prevent this, each thread tracks the total_collections() value, and if | |
| 374 // the count has changed, does not do a new collection. | |
| 375 // | |
| 376 // The collection count must be read only while holding the heap lock. VM | |
| 377 // operations also hold the heap lock during collections. There is a lock | |
| 378 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 379 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 380 // the collection count has already changed. To prevent duplicate collections, | |
| 381 // The policy MUST attempt allocations during the same period it reads the | |
| 382 // total_collections() value! | |
| 383 { | |
| 384 MutexLocker ml(Heap_lock); | |
| 385 gc_count = Universe::heap()->total_collections(); | |
| 386 | |
| 387 result = young_gen()->allocate(size, is_tlab); | |
| 388 | |
| 389 // (1) If the requested object is too large to easily fit in the | |
| 390 // young_gen, or | |
| 391 // (2) If GC is locked out via GCLocker, young gen is full and | |
| 392 // the need for a GC already signalled to GCLocker (done | |
| 393 // at a safepoint), | |
| 394 // ... then, rather than force a safepoint and (a potentially futile) | |
| 395 // collection (attempt) for each allocation, try allocation directly | |
| 396 // in old_gen. For case (2) above, we may in the future allow | |
| 397 // TLAB allocation directly in the old gen. | |
| 398 if (result != NULL) { | |
| 399 return result; | |
| 400 } | |
| 401 if (!is_tlab && | |
|
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402 size >= (young_gen()->eden_space()->capacity_in_words(Thread::current()) / 2)) { |
| 0 | 403 result = old_gen()->allocate(size, is_tlab); |
| 404 if (result != NULL) { | |
| 405 return result; | |
| 406 } | |
| 407 } | |
| 408 if (GC_locker::is_active_and_needs_gc()) { | |
| 409 // GC is locked out. If this is a TLAB allocation, | |
| 410 // return NULL; the requestor will retry allocation | |
| 411 // of an idividual object at a time. | |
| 412 if (is_tlab) { | |
| 413 return NULL; | |
| 414 } | |
| 415 | |
| 416 // If this thread is not in a jni critical section, we stall | |
| 417 // the requestor until the critical section has cleared and | |
| 418 // GC allowed. When the critical section clears, a GC is | |
| 419 // initiated by the last thread exiting the critical section; so | |
| 420 // we retry the allocation sequence from the beginning of the loop, | |
| 421 // rather than causing more, now probably unnecessary, GC attempts. | |
| 422 JavaThread* jthr = JavaThread::current(); | |
| 423 if (!jthr->in_critical()) { | |
| 424 MutexUnlocker mul(Heap_lock); | |
| 425 GC_locker::stall_until_clear(); | |
| 426 continue; | |
| 427 } else { | |
| 428 if (CheckJNICalls) { | |
| 429 fatal("Possible deadlock due to allocating while" | |
| 430 " in jni critical section"); | |
| 431 } | |
| 432 return NULL; | |
| 433 } | |
| 434 } | |
| 435 } | |
| 436 | |
| 437 if (result == NULL) { | |
| 438 | |
| 439 // Generate a VM operation | |
| 440 VM_ParallelGCFailedAllocation op(size, is_tlab, gc_count); | |
| 441 VMThread::execute(&op); | |
| 442 | |
| 443 // Did the VM operation execute? If so, return the result directly. | |
| 444 // This prevents us from looping until time out on requests that can | |
| 445 // not be satisfied. | |
| 446 if (op.prologue_succeeded()) { | |
| 447 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 448 "result not in heap"); | |
| 449 | |
| 450 // If GC was locked out during VM operation then retry allocation | |
| 451 // and/or stall as necessary. | |
| 452 if (op.gc_locked()) { | |
| 453 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 454 continue; // retry and/or stall as necessary | |
| 455 } | |
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456 |
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457 // Exit the loop if the gc time limit has been exceeded. |
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458 // The allocation must have failed above ("result" guarding |
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459 // this path is NULL) and the most recent collection has exceeded the |
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460 // gc overhead limit (although enough may have been collected to |
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461 // satisfy the allocation). Exit the loop so that an out-of-memory |
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462 // will be thrown (return a NULL ignoring the contents of |
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463 // op.result()), |
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464 // but clear gc_overhead_limit_exceeded so that the next collection |
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465 // starts with a clean slate (i.e., forgets about previous overhead |
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466 // excesses). Fill op.result() with a filler object so that the |
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467 // heap remains parsable. |
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468 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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469 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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470 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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471 if (limit_exceeded && softrefs_clear) { |
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472 *gc_overhead_limit_was_exceeded = true; |
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473 size_policy()->set_gc_overhead_limit_exceeded(false); |
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474 if (PrintGCDetails && Verbose) { |
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475 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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476 "return NULL because gc_overhead_limit_exceeded is set"); |
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477 } |
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478 if (op.result() != NULL) { |
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479 CollectedHeap::fill_with_object(op.result(), size); |
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480 } |
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481 return NULL; |
| 0 | 482 } |
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483 |
| 0 | 484 return op.result(); |
| 485 } | |
| 486 } | |
| 487 | |
| 488 // The policy object will prevent us from looping forever. If the | |
| 489 // time spent in gc crosses a threshold, we will bail out. | |
| 490 loop_count++; | |
| 491 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 492 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 493 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
| 494 " size=%d %s", loop_count, size, is_tlab ? "(TLAB)" : ""); | |
| 495 } | |
| 496 } | |
| 497 | |
| 498 return result; | |
| 499 } | |
| 500 | |
| 501 // Failed allocation policy. Must be called from the VM thread, and | |
| 502 // only at a safepoint! Note that this method has policy for allocation | |
| 503 // flow, and NOT collection policy. So we do not check for gc collection | |
| 504 // time over limit here, that is the responsibility of the heap specific | |
| 505 // collection methods. This method decides where to attempt allocations, | |
| 506 // and when to attempt collections, but no collection specific policy. | |
| 507 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size, bool is_tlab) { | |
| 508 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 509 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 510 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 511 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 512 | |
| 513 size_t mark_sweep_invocation_count = total_invocations(); | |
| 514 | |
| 515 // We assume (and assert!) that an allocation at this point will fail | |
| 516 // unless we collect. | |
| 517 | |
| 518 // First level allocation failure, scavenge and allocate in young gen. | |
| 519 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
| 520 PSScavenge::invoke(); | |
| 521 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
| 522 | |
| 523 // Second level allocation failure. | |
| 524 // Mark sweep and allocate in young generation. | |
| 525 if (result == NULL) { | |
| 526 // There is some chance the scavenge method decided to invoke mark_sweep. | |
| 527 // Don't mark sweep twice if so. | |
| 528 if (mark_sweep_invocation_count == total_invocations()) { | |
| 529 invoke_full_gc(false); | |
| 530 result = young_gen()->allocate(size, is_tlab); | |
| 531 } | |
| 532 } | |
| 533 | |
| 534 // Third level allocation failure. | |
| 535 // After mark sweep and young generation allocation failure, | |
| 536 // allocate in old generation. | |
| 537 if (result == NULL && !is_tlab) { | |
| 538 result = old_gen()->allocate(size, is_tlab); | |
| 539 } | |
| 540 | |
| 541 // Fourth level allocation failure. We're running out of memory. | |
| 542 // More complete mark sweep and allocate in young generation. | |
| 543 if (result == NULL) { | |
| 544 invoke_full_gc(true); | |
| 545 result = young_gen()->allocate(size, is_tlab); | |
| 546 } | |
| 547 | |
| 548 // Fifth level allocation failure. | |
| 549 // After more complete mark sweep, allocate in old generation. | |
| 550 if (result == NULL && !is_tlab) { | |
| 551 result = old_gen()->allocate(size, is_tlab); | |
| 552 } | |
| 553 | |
| 554 return result; | |
| 555 } | |
| 556 | |
| 557 // | |
| 558 // This is the policy loop for allocating in the permanent generation. | |
| 559 // If the initial allocation fails, we create a vm operation which will | |
| 560 // cause a collection. | |
| 561 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
| 562 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 563 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 564 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 565 | |
| 566 HeapWord* result; | |
| 567 | |
| 568 uint loop_count = 0; | |
| 569 uint gc_count = 0; | |
| 570 uint full_gc_count = 0; | |
| 571 | |
| 572 do { | |
| 573 // We don't want to have multiple collections for a single filled generation. | |
| 574 // To prevent this, each thread tracks the total_collections() value, and if | |
| 575 // the count has changed, does not do a new collection. | |
| 576 // | |
| 577 // The collection count must be read only while holding the heap lock. VM | |
| 578 // operations also hold the heap lock during collections. There is a lock | |
| 579 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 580 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 581 // the collection count has already changed. To prevent duplicate collections, | |
| 582 // The policy MUST attempt allocations during the same period it reads the | |
| 583 // total_collections() value! | |
| 584 { | |
| 585 MutexLocker ml(Heap_lock); | |
| 586 gc_count = Universe::heap()->total_collections(); | |
| 587 full_gc_count = Universe::heap()->total_full_collections(); | |
| 588 | |
| 589 result = perm_gen()->allocate_permanent(size); | |
|
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590 |
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591 if (result != NULL) { |
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592 return result; |
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593 } |
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594 |
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595 if (GC_locker::is_active_and_needs_gc()) { |
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596 // If this thread is not in a jni critical section, we stall |
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597 // the requestor until the critical section has cleared and |
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598 // GC allowed. When the critical section clears, a GC is |
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599 // initiated by the last thread exiting the critical section; so |
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600 // we retry the allocation sequence from the beginning of the loop, |
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601 // rather than causing more, now probably unnecessary, GC attempts. |
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602 JavaThread* jthr = JavaThread::current(); |
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603 if (!jthr->in_critical()) { |
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604 MutexUnlocker mul(Heap_lock); |
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605 GC_locker::stall_until_clear(); |
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606 continue; |
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607 } else { |
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608 if (CheckJNICalls) { |
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609 fatal("Possible deadlock due to allocating while" |
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610 " in jni critical section"); |
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611 } |
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612 return NULL; |
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613 } |
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614 } |
| 0 | 615 } |
| 616 | |
| 617 if (result == NULL) { | |
| 618 | |
| 619 // Exit the loop if the gc time limit has been exceeded. | |
| 620 // The allocation must have failed above (result must be NULL), | |
| 621 // and the most recent collection must have exceeded the | |
| 622 // gc time limit. Exit the loop so that an out-of-memory | |
| 623 // will be thrown (returning a NULL will do that), but | |
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624 // clear gc_overhead_limit_exceeded so that the next collection |
| 0 | 625 // will succeeded if the applications decides to handle the |
| 626 // out-of-memory and tries to go on. | |
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627 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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628 if (limit_exceeded) { |
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629 size_policy()->set_gc_overhead_limit_exceeded(false); |
| 0 | 630 if (PrintGCDetails && Verbose) { |
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631 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate:" |
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632 " return NULL because gc_overhead_limit_exceeded is set"); |
| 0 | 633 } |
| 634 assert(result == NULL, "Allocation did not fail"); | |
| 635 return NULL; | |
| 636 } | |
| 637 | |
| 638 // Generate a VM operation | |
| 639 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
| 640 VMThread::execute(&op); | |
| 641 | |
| 642 // Did the VM operation execute? If so, return the result directly. | |
| 643 // This prevents us from looping until time out on requests that can | |
| 644 // not be satisfied. | |
| 645 if (op.prologue_succeeded()) { | |
| 646 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
| 647 "result not in heap"); | |
|
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648 // If GC was locked out during VM operation then retry allocation |
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649 // and/or stall as necessary. |
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650 if (op.gc_locked()) { |
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651 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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652 continue; // retry and/or stall as necessary |
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653 } |
| 0 | 654 // If a NULL results is being returned, an out-of-memory |
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655 // will be thrown now. Clear the gc_overhead_limit_exceeded |
| 0 | 656 // flag to avoid the following situation. |
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657 // gc_overhead_limit_exceeded is set during a collection |
| 0 | 658 // the collection fails to return enough space and an OOM is thrown |
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659 // a subsequent GC prematurely throws an out-of-memory because |
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660 // the gc_overhead_limit_exceeded counts did not start |
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661 // again from 0. |
| 0 | 662 if (op.result() == NULL) { |
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663 size_policy()->reset_gc_overhead_limit_count(); |
| 0 | 664 } |
| 665 return op.result(); | |
| 666 } | |
| 667 } | |
| 668 | |
| 669 // The policy object will prevent us from looping forever. If the | |
| 670 // time spent in gc crosses a threshold, we will bail out. | |
| 671 loop_count++; | |
| 672 if ((QueuedAllocationWarningCount > 0) && | |
| 673 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 674 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
| 675 " size=%d", loop_count, size); | |
| 676 } | |
| 677 } while (result == NULL); | |
| 678 | |
| 679 return result; | |
| 680 } | |
| 681 | |
| 682 // | |
| 683 // This is the policy code for permanent allocations which have failed | |
| 684 // and require a collection. Note that just as in failed_mem_allocate, | |
| 685 // we do not set collection policy, only where & when to allocate and | |
| 686 // collect. | |
| 687 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
| 688 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 689 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 690 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 691 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 692 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
| 693 | |
| 694 // We assume (and assert!) that an allocation at this point will fail | |
| 695 // unless we collect. | |
| 696 | |
| 697 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
| 698 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
| 699 invoke_full_gc(false); | |
| 700 HeapWord* result = perm_gen()->allocate_permanent(size); | |
| 701 | |
| 702 // Second level allocation failure. We're running out of memory. | |
| 703 if (result == NULL) { | |
| 704 invoke_full_gc(true); | |
| 705 result = perm_gen()->allocate_permanent(size); | |
| 706 } | |
| 707 | |
| 708 return result; | |
| 709 } | |
| 710 | |
| 711 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 712 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 713 young_gen()->eden_space()->ensure_parsability(); | |
| 714 } | |
| 715 | |
| 716 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 717 return young_gen()->eden_space()->free_in_bytes(); | |
| 718 } | |
| 719 | |
| 720 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 721 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 722 } | |
| 723 | |
| 724 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 725 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 726 } | |
| 727 | |
| 728 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
| 729 return young_gen()->allocate(size, true); | |
| 730 } | |
| 731 | |
| 732 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 733 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 734 } | |
| 735 | |
| 736 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 737 CollectedHeap::resize_all_tlabs(); | |
| 738 } | |
| 739 | |
|
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740 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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741 // We don't need barriers for stores to objects in the |
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742 // young gen and, a fortiori, for initializing stores to |
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743 // objects therein. |
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744 return is_in_young(new_obj); |
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745 } |
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746 |
| 0 | 747 // This method is used by System.gc() and JVMTI. |
| 748 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 749 assert(!Heap_lock->owned_by_self(), | |
| 750 "this thread should not own the Heap_lock"); | |
| 751 | |
| 752 unsigned int gc_count = 0; | |
| 753 unsigned int full_gc_count = 0; | |
| 754 { | |
| 755 MutexLocker ml(Heap_lock); | |
| 756 // This value is guarded by the Heap_lock | |
| 757 gc_count = Universe::heap()->total_collections(); | |
| 758 full_gc_count = Universe::heap()->total_full_collections(); | |
| 759 } | |
| 760 | |
| 761 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 762 VMThread::execute(&op); | |
| 763 } | |
| 764 | |
| 765 // This interface assumes that it's being called by the | |
| 766 // vm thread. It collects the heap assuming that the | |
| 767 // heap lock is already held and that we are executing in | |
| 768 // the context of the vm thread. | |
| 769 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 770 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 771 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 772 GCCauseSetter gcs(this, cause); | |
| 773 switch (cause) { | |
| 774 case GCCause::_heap_inspection: | |
| 775 case GCCause::_heap_dump: { | |
| 776 HandleMark hm; | |
| 777 invoke_full_gc(false); | |
| 778 break; | |
| 779 } | |
| 780 default: // XXX FIX ME | |
| 781 ShouldNotReachHere(); | |
| 782 } | |
| 783 } | |
| 784 | |
| 785 | |
| 786 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
| 787 Unimplemented(); | |
| 788 } | |
| 789 | |
| 790 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 791 young_gen()->object_iterate(cl); | |
| 792 old_gen()->object_iterate(cl); | |
| 793 perm_gen()->object_iterate(cl); | |
| 794 } | |
| 795 | |
| 796 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
| 797 Unimplemented(); | |
| 798 } | |
| 799 | |
| 800 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
| 801 perm_gen()->object_iterate(cl); | |
| 802 } | |
| 803 | |
| 804 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 805 if (young_gen()->is_in_reserved(addr)) { | |
| 806 assert(young_gen()->is_in(addr), | |
| 807 "addr should be in allocated part of young gen"); | |
|
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808 if (Debugging) return NULL; // called from find() in debug.cpp |
| 0 | 809 Unimplemented(); |
| 810 } else if (old_gen()->is_in_reserved(addr)) { | |
| 811 assert(old_gen()->is_in(addr), | |
| 812 "addr should be in allocated part of old gen"); | |
| 813 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 814 } else if (perm_gen()->is_in_reserved(addr)) { | |
| 815 assert(perm_gen()->is_in(addr), | |
| 816 "addr should be in allocated part of perm gen"); | |
| 817 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
| 818 } | |
| 819 return 0; | |
| 820 } | |
| 821 | |
| 822 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 823 return oop(addr)->size(); | |
| 824 } | |
| 825 | |
| 826 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 827 return block_start(addr) == addr; | |
| 828 } | |
| 829 | |
| 830 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 831 return UseParallelOldGC ? | |
| 832 PSParallelCompact::millis_since_last_gc() : | |
| 833 PSMarkSweep::millis_since_last_gc(); | |
| 834 } | |
| 835 | |
| 836 void ParallelScavengeHeap::prepare_for_verify() { | |
| 837 ensure_parsability(false); // no need to retire TLABs for verification | |
| 838 } | |
| 839 | |
| 840 void ParallelScavengeHeap::print() const { print_on(tty); } | |
| 841 | |
| 842 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
| 843 young_gen()->print_on(st); | |
| 844 old_gen()->print_on(st); | |
| 845 perm_gen()->print_on(st); | |
| 846 } | |
| 847 | |
| 848 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 849 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 850 } | |
| 851 | |
| 852 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 853 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 854 } | |
| 855 | |
| 856 void ParallelScavengeHeap::print_tracing_info() const { | |
| 857 if (TraceGen0Time) { | |
| 858 double time = PSScavenge::accumulated_time()->seconds(); | |
| 859 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 860 } | |
| 861 if (TraceGen1Time) { | |
| 862 double time = PSMarkSweep::accumulated_time()->seconds(); | |
| 863 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
| 864 } | |
| 865 } | |
| 866 | |
| 867 | |
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868 void ParallelScavengeHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
| 0 | 869 // Why do we need the total_collections()-filter below? |
| 870 if (total_collections() > 0) { | |
| 871 if (!silent) { | |
| 872 gclog_or_tty->print("permanent "); | |
| 873 } | |
| 874 perm_gen()->verify(allow_dirty); | |
| 875 | |
| 876 if (!silent) { | |
| 877 gclog_or_tty->print("tenured "); | |
| 878 } | |
| 879 old_gen()->verify(allow_dirty); | |
| 880 | |
| 881 if (!silent) { | |
| 882 gclog_or_tty->print("eden "); | |
| 883 } | |
| 884 young_gen()->verify(allow_dirty); | |
| 885 } | |
| 886 if (!silent) { | |
| 887 gclog_or_tty->print("ref_proc "); | |
| 888 } | |
| 889 ReferenceProcessor::verify(); | |
| 890 } | |
| 891 | |
| 892 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 893 if (PrintGCDetails && Verbose) { | |
| 894 gclog_or_tty->print(" " SIZE_FORMAT | |
| 895 "->" SIZE_FORMAT | |
| 896 "(" SIZE_FORMAT ")", | |
| 897 prev_used, used(), capacity()); | |
| 898 } else { | |
| 899 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 900 "->" SIZE_FORMAT "K" | |
| 901 "(" SIZE_FORMAT "K)", | |
| 902 prev_used / K, used() / K, capacity() / K); | |
| 903 } | |
| 904 } | |
| 905 | |
| 906 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
| 907 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 908 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 909 return _psh; | |
| 910 } | |
| 911 | |
| 912 // Before delegating the resize to the young generation, | |
| 913 // the reserved space for the young and old generations | |
| 914 // may be changed to accomodate the desired resize. | |
| 915 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 916 size_t survivor_size) { | |
| 917 if (UseAdaptiveGCBoundary) { | |
| 918 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 919 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 920 return; // The generation changed size already. | |
| 921 } | |
| 922 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 923 } | |
| 924 | |
| 925 // Delegate the resize to the generation. | |
| 926 _young_gen->resize(eden_size, survivor_size); | |
| 927 } | |
| 928 | |
| 929 // Before delegating the resize to the old generation, | |
| 930 // the reserved space for the young and old generations | |
| 931 // may be changed to accomodate the desired resize. | |
| 932 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 933 if (UseAdaptiveGCBoundary) { | |
| 934 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 935 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 936 return; // The generation changed size already. | |
| 937 } | |
| 938 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 939 } | |
| 940 | |
| 941 // Delegate the resize to the generation. | |
| 942 _old_gen->resize(desired_free_space); | |
| 943 } | |
|
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944 |
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945 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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946 // nothing particular |
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947 } |
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948 |
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949 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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950 // nothing particular |
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951 } |
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952 |
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953 #ifndef PRODUCT |
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954 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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955 if (ZapUnusedHeapArea) { |
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956 young_gen()->record_spaces_top(); |
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957 old_gen()->record_spaces_top(); |
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958 perm_gen()->record_spaces_top(); |
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959 } |
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960 } |
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961 |
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962 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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963 if (ZapUnusedHeapArea) { |
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964 young_gen()->eden_space()->mangle_unused_area(); |
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965 young_gen()->to_space()->mangle_unused_area(); |
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966 young_gen()->from_space()->mangle_unused_area(); |
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967 old_gen()->object_space()->mangle_unused_area(); |
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6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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968 perm_gen()->object_space()->mangle_unused_area(); |
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12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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969 } |
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12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
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139
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changeset
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970 } |
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12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
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971 #endif |