Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | 7b835924c31c |
| children | 1a8fb39bdbc4 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 10405 | 2 * Copyright (c) 2001, 2013, 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" | |
| 10405 | 38 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 39 #include "gc_implementation/shared/gcWhen.hpp" | |
| 1972 | 40 #include "memory/gcLocker.inline.hpp" |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/handles.inline.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 44 #include "runtime/vmThread.hpp" | |
| 6197 | 45 #include "services/memTracker.hpp" |
| 1972 | 46 #include "utilities/vmError.hpp" |
| 0 | 47 |
| 48 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
| 49 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
| 50 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
| 51 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
| 52 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
| 53 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
| 54 | |
| 55 static void trace_gen_sizes(const char* const str, | |
| 56 size_t og_min, size_t og_max, | |
| 57 size_t yg_min, size_t yg_max) | |
| 58 { | |
| 59 if (TracePageSizes) { | |
| 60 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
| 61 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 62 SIZE_FORMAT, | |
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63 str, |
| 0 | 64 og_min / K, og_max / K, |
| 65 yg_min / K, yg_max / K, | |
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66 (og_max + yg_max) / K); |
| 0 | 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 |
| 82 trace_gen_sizes("ps heap raw", | |
| 83 og_min_size, og_max_size, | |
| 84 yg_min_size, yg_max_size); | |
| 85 | |
| 86 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
| 87 yg_max_size + og_max_size, | |
| 88 8); | |
| 89 | |
| 90 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
| 91 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
| 92 | |
| 93 // Update sizes to reflect the selected page size(s). | |
| 94 // | |
| 95 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
| 96 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
| 97 // move to the common code. | |
| 98 yg_min_size = align_size_up(yg_min_size, yg_align); | |
| 99 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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100 size_t yg_cur_size = |
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101 align_size_up(_collector_policy->young_gen_size(), yg_align); |
| 0 | 102 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
| 103 | |
| 104 og_min_size = align_size_up(og_min_size, og_align); | |
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105 // Align old gen size down to preserve specified heap size. |
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106 assert(og_align == yg_align, "sanity"); |
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107 og_max_size = align_size_down(og_max_size, og_align); |
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108 og_max_size = MAX2(og_max_size, og_min_size); |
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109 size_t og_cur_size = |
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110 align_size_down(_collector_policy->old_gen_size(), og_align); |
| 0 | 111 og_cur_size = MAX2(og_cur_size, og_min_size); |
| 112 | |
| 113 trace_gen_sizes("ps heap rnd", | |
| 114 og_min_size, og_max_size, | |
| 115 yg_min_size, yg_max_size); | |
| 116 | |
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117 const size_t heap_size = og_max_size + yg_max_size; |
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118 |
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119 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, og_align); |
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120 |
| 6197 | 121 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
| 122 | |
| 0 | 123 os::trace_page_sizes("ps main", og_min_size + yg_min_size, |
| 124 og_max_size + yg_max_size, og_page_sz, | |
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125 heap_rs.base(), |
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126 heap_rs.size()); |
| 0 | 127 if (!heap_rs.is_reserved()) { |
| 128 vm_shutdown_during_initialization( | |
| 129 "Could not reserve enough space for object heap"); | |
| 130 return JNI_ENOMEM; | |
| 131 } | |
| 132 | |
| 133 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 134 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 135 | |
| 136 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 137 _barrier_set = barrier_set; | |
| 138 oopDesc::set_bs(_barrier_set); | |
| 139 if (_barrier_set == NULL) { | |
| 140 vm_shutdown_during_initialization( | |
| 141 "Could not reserve enough space for barrier set"); | |
| 142 return JNI_ENOMEM; | |
| 143 } | |
| 144 | |
| 145 // Initial young gen size is 4 Mb | |
| 146 // | |
| 147 // XXX - what about flag_parser.young_gen_size()? | |
| 148 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
| 149 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
| 150 | |
| 151 // Make up the generations | |
| 152 // Calculate the maximum size that a generation can grow. This | |
| 153 // includes growth into the other generation. Note that the | |
| 154 // parameter _max_gen_size is kept as the maximum | |
| 155 // size of the generation as the boundaries currently stand. | |
| 156 // _max_gen_size is still used as that value. | |
| 157 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 158 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 159 | |
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160 _gens = new AdjoiningGenerations(heap_rs, |
| 0 | 161 og_cur_size, |
| 162 og_min_size, | |
| 163 og_max_size, | |
| 164 yg_cur_size, | |
| 165 yg_min_size, | |
| 166 yg_max_size, | |
| 167 yg_align); | |
| 168 | |
| 169 _old_gen = _gens->old_gen(); | |
| 170 _young_gen = _gens->young_gen(); | |
| 171 | |
| 172 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 173 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 174 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 175 _size_policy = | |
| 176 new PSAdaptiveSizePolicy(eden_capacity, | |
| 177 initial_promo_size, | |
| 178 young_gen()->to_space()->capacity_in_bytes(), | |
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179 intra_heap_alignment(), |
| 0 | 180 max_gc_pause_sec, |
| 181 max_gc_minor_pause_sec, | |
| 182 GCTimeRatio | |
| 183 ); | |
| 184 | |
| 185 assert(!UseAdaptiveGCBoundary || | |
| 186 (old_gen()->virtual_space()->high_boundary() == | |
| 187 young_gen()->virtual_space()->low_boundary()), | |
| 188 "Boundaries must meet"); | |
| 189 // initialize the policy counters - 2 collectors, 3 generations | |
| 190 _gc_policy_counters = | |
| 191 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 192 _psh = this; | |
| 193 | |
| 194 // Set up the GCTaskManager | |
| 195 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 196 | |
| 197 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 198 return JNI_ENOMEM; | |
| 199 } | |
| 200 | |
| 201 return JNI_OK; | |
| 202 } | |
| 203 | |
| 204 void ParallelScavengeHeap::post_initialize() { | |
| 205 // Need to init the tenuring threshold | |
| 206 PSScavenge::initialize(); | |
| 207 if (UseParallelOldGC) { | |
| 208 PSParallelCompact::post_initialize(); | |
| 209 } else { | |
| 210 PSMarkSweep::initialize(); | |
| 211 } | |
| 212 PSPromotionManager::initialize(); | |
| 213 } | |
| 214 | |
| 215 void ParallelScavengeHeap::update_counters() { | |
| 216 young_gen()->update_counters(); | |
| 217 old_gen()->update_counters(); | |
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218 MetaspaceCounters::update_performance_counters(); |
| 0 | 219 } |
| 220 | |
| 221 size_t ParallelScavengeHeap::capacity() const { | |
| 222 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 223 return value; | |
| 224 } | |
| 225 | |
| 226 size_t ParallelScavengeHeap::used() const { | |
| 227 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 228 return value; | |
| 229 } | |
| 230 | |
| 231 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 232 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 233 } | |
| 234 | |
| 235 | |
| 236 size_t ParallelScavengeHeap::max_capacity() const { | |
| 237 size_t estimated = reserved_region().byte_size(); | |
| 238 if (UseAdaptiveSizePolicy) { | |
| 239 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 240 } else { | |
| 241 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 242 } | |
| 243 return MAX2(estimated, capacity()); | |
| 244 } | |
| 245 | |
| 246 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 247 if (young_gen()->is_in(p)) { | |
| 248 return true; | |
| 249 } | |
| 250 | |
| 251 if (old_gen()->is_in(p)) { | |
| 252 return true; | |
| 253 } | |
| 254 | |
| 255 return false; | |
| 256 } | |
| 257 | |
| 258 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 259 if (young_gen()->is_in_reserved(p)) { | |
| 260 return true; | |
| 261 } | |
| 262 | |
| 263 if (old_gen()->is_in_reserved(p)) { | |
| 264 return true; | |
| 265 } | |
| 266 | |
| 267 return false; | |
| 268 } | |
| 269 | |
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270 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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271 return is_in_young((oop)addr); |
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272 } |
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273 |
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274 #ifdef ASSERT |
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275 // Don't implement this by using is_in_young(). This method is used |
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276 // in some cases to check that is_in_young() is correct. |
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277 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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278 assert(is_in_reserved(p) || p == NULL, |
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279 "Does not work if address is non-null and outside of the heap"); |
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280 // The order of the generations is old (low addr), young (high addr) |
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281 return p >= old_gen()->reserved().end(); |
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282 } |
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283 #endif |
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284 |
| 0 | 285 // There are two levels of allocation policy here. |
| 286 // | |
| 287 // When an allocation request fails, the requesting thread must invoke a VM | |
| 288 // operation, transfer control to the VM thread, and await the results of a | |
| 289 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 290 // multiple times if possible. | |
| 291 // | |
| 292 // To accomplish this, we have a basic allocation policy, and also a | |
| 293 // failed allocation policy. | |
| 294 // | |
| 295 // The basic allocation policy controls how you allocate memory without | |
| 296 // attempting garbage collection. It is okay to grab locks and | |
| 297 // expand the heap, if that can be done without coming to a safepoint. | |
| 298 // It is likely that the basic allocation policy will not be very | |
| 299 // aggressive. | |
| 300 // | |
| 301 // The failed allocation policy is invoked from the VM thread after | |
| 302 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 303 // request. This policy needs to cover the entire range of collection, | |
| 304 // heap expansion, and out-of-memory conditions. It should make every | |
| 305 // attempt to allocate the requested memory. | |
| 306 | |
| 307 // Basic allocation policy. Should never be called at a safepoint, or | |
| 308 // from the VM thread. | |
| 309 // | |
| 310 // This method must handle cases where many mem_allocate requests fail | |
| 311 // simultaneously. When that happens, only one VM operation will succeed, | |
| 312 // and the rest will not be executed. For that reason, this method loops | |
| 313 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 314 // we rely on the size_policy object to force a bail out. | |
| 315 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 316 size_t size, | |
| 317 bool* gc_overhead_limit_was_exceeded) { | |
| 318 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 319 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 320 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 321 | |
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322 // In general gc_overhead_limit_was_exceeded should be false so |
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323 // set it so here and reset it to true only if the gc time |
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324 // limit is being exceeded as checked below. |
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325 *gc_overhead_limit_was_exceeded = false; |
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326 |
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327 HeapWord* result = young_gen()->allocate(size); |
| 0 | 328 |
| 329 uint loop_count = 0; | |
| 330 uint gc_count = 0; | |
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331 int gclocker_stalled_count = 0; |
| 0 | 332 |
| 333 while (result == NULL) { | |
| 334 // We don't want to have multiple collections for a single filled generation. | |
| 335 // To prevent this, each thread tracks the total_collections() value, and if | |
| 336 // the count has changed, does not do a new collection. | |
| 337 // | |
| 338 // The collection count must be read only while holding the heap lock. VM | |
| 339 // operations also hold the heap lock during collections. There is a lock | |
| 340 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 341 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 342 // the collection count has already changed. To prevent duplicate collections, | |
| 343 // The policy MUST attempt allocations during the same period it reads the | |
| 344 // total_collections() value! | |
| 345 { | |
| 346 MutexLocker ml(Heap_lock); | |
| 347 gc_count = Universe::heap()->total_collections(); | |
| 348 | |
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349 result = young_gen()->allocate(size); |
| 0 | 350 if (result != NULL) { |
| 351 return result; | |
| 352 } | |
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353 |
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354 // If certain conditions hold, try allocating from the old gen. |
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355 result = mem_allocate_old_gen(size); |
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356 if (result != NULL) { |
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357 return result; |
| 0 | 358 } |
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359 |
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360 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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361 return NULL; |
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362 } |
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363 |
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364 // Failed to allocate without a gc. |
| 0 | 365 if (GC_locker::is_active_and_needs_gc()) { |
| 366 // If this thread is not in a jni critical section, we stall | |
| 367 // the requestor until the critical section has cleared and | |
| 368 // GC allowed. When the critical section clears, a GC is | |
| 369 // initiated by the last thread exiting the critical section; so | |
| 370 // we retry the allocation sequence from the beginning of the loop, | |
| 371 // rather than causing more, now probably unnecessary, GC attempts. | |
| 372 JavaThread* jthr = JavaThread::current(); | |
| 373 if (!jthr->in_critical()) { | |
| 374 MutexUnlocker mul(Heap_lock); | |
| 375 GC_locker::stall_until_clear(); | |
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376 gclocker_stalled_count += 1; |
| 0 | 377 continue; |
| 378 } else { | |
| 379 if (CheckJNICalls) { | |
| 380 fatal("Possible deadlock due to allocating while" | |
| 381 " in jni critical section"); | |
| 382 } | |
| 383 return NULL; | |
| 384 } | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 if (result == NULL) { | |
| 389 // Generate a VM operation | |
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390 VM_ParallelGCFailedAllocation op(size, gc_count); |
| 0 | 391 VMThread::execute(&op); |
| 392 | |
| 393 // Did the VM operation execute? If so, return the result directly. | |
| 394 // This prevents us from looping until time out on requests that can | |
| 395 // not be satisfied. | |
| 396 if (op.prologue_succeeded()) { | |
| 397 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 398 "result not in heap"); | |
| 399 | |
| 400 // If GC was locked out during VM operation then retry allocation | |
| 401 // and/or stall as necessary. | |
| 402 if (op.gc_locked()) { | |
| 403 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 404 continue; // retry and/or stall as necessary | |
| 405 } | |
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406 |
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407 // Exit the loop if the gc time limit has been exceeded. |
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408 // The allocation must have failed above ("result" guarding |
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409 // this path is NULL) and the most recent collection has exceeded the |
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410 // gc overhead limit (although enough may have been collected to |
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411 // satisfy the allocation). Exit the loop so that an out-of-memory |
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412 // will be thrown (return a NULL ignoring the contents of |
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413 // op.result()), |
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414 // but clear gc_overhead_limit_exceeded so that the next collection |
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415 // starts with a clean slate (i.e., forgets about previous overhead |
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416 // excesses). Fill op.result() with a filler object so that the |
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417 // heap remains parsable. |
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418 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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419 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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420 |
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421 if (limit_exceeded && softrefs_clear) { |
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422 *gc_overhead_limit_was_exceeded = true; |
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423 size_policy()->set_gc_overhead_limit_exceeded(false); |
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424 if (PrintGCDetails && Verbose) { |
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425 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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426 "return NULL because gc_overhead_limit_exceeded is set"); |
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427 } |
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428 if (op.result() != NULL) { |
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429 CollectedHeap::fill_with_object(op.result(), size); |
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430 } |
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431 return NULL; |
| 0 | 432 } |
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433 |
| 0 | 434 return op.result(); |
| 435 } | |
| 436 } | |
| 437 | |
| 438 // The policy object will prevent us from looping forever. If the | |
| 439 // time spent in gc crosses a threshold, we will bail out. | |
| 440 loop_count++; | |
| 441 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 442 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 443 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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444 " size=%d", loop_count, size); |
| 0 | 445 } |
| 446 } | |
| 447 | |
| 448 return result; | |
| 449 } | |
| 450 | |
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451 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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452 // done before each allocation, and after the full gc the allocation still |
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453 // cannot be satisfied from the young gen. This routine detects that condition; |
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454 // it should be called after a full gc has been done and the allocation |
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455 // attempted from the young gen. The parameter 'addr' should be the result of |
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456 // that young gen allocation attempt. |
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457 void |
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458 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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459 if (addr != NULL) { |
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460 _death_march_count = 0; // death march has ended |
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461 } else if (_death_march_count == 0) { |
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462 if (should_alloc_in_eden(size)) { |
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463 _death_march_count = 1; // death march has started |
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464 } |
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465 } |
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466 } |
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467 |
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468 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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469 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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470 // Size is too big for eden, or gc is locked out. |
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471 return old_gen()->allocate(size); |
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472 } |
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473 |
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474 // If a "death march" is in progress, allocate from the old gen a limited |
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475 // number of times before doing a GC. |
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476 if (_death_march_count > 0) { |
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477 if (_death_march_count < 64) { |
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478 ++_death_march_count; |
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479 return old_gen()->allocate(size); |
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480 } else { |
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481 _death_march_count = 0; |
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482 } |
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483 } |
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484 return NULL; |
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485 } |
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486 |
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487 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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488 if (UseParallelOldGC) { |
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489 // The do_full_collection() parameter clear_all_soft_refs |
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490 // is interpreted here as maximum_compaction which will |
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491 // cause SoftRefs to be cleared. |
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492 bool maximum_compaction = clear_all_soft_refs; |
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493 PSParallelCompact::invoke(maximum_compaction); |
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494 } else { |
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495 PSMarkSweep::invoke(clear_all_soft_refs); |
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496 } |
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497 } |
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498 |
| 0 | 499 // Failed allocation policy. Must be called from the VM thread, and |
| 500 // only at a safepoint! Note that this method has policy for allocation | |
| 501 // flow, and NOT collection policy. So we do not check for gc collection | |
| 502 // time over limit here, that is the responsibility of the heap specific | |
| 503 // collection methods. This method decides where to attempt allocations, | |
| 504 // and when to attempt collections, but no collection specific policy. | |
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505 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
| 0 | 506 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 507 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 508 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 509 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 510 | |
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511 // We assume that allocation in eden will fail unless we collect. |
| 0 | 512 |
| 513 // First level allocation failure, scavenge and allocate in young gen. | |
| 514 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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515 const bool invoked_full_gc = PSScavenge::invoke(); |
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516 HeapWord* result = young_gen()->allocate(size); |
| 0 | 517 |
| 518 // Second level allocation failure. | |
| 519 // Mark sweep and allocate in young generation. | |
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520 if (result == NULL && !invoked_full_gc) { |
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521 do_full_collection(false); |
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522 result = young_gen()->allocate(size); |
| 0 | 523 } |
| 524 | |
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525 death_march_check(result, size); |
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526 |
| 0 | 527 // Third level allocation failure. |
| 528 // After mark sweep and young generation allocation failure, | |
| 529 // allocate in old generation. | |
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530 if (result == NULL) { |
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531 result = old_gen()->allocate(size); |
| 0 | 532 } |
| 533 | |
| 534 // Fourth level allocation failure. We're running out of memory. | |
| 535 // More complete mark sweep and allocate in young generation. | |
| 536 if (result == NULL) { | |
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537 do_full_collection(true); |
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538 result = young_gen()->allocate(size); |
| 0 | 539 } |
| 540 | |
| 541 // Fifth level allocation failure. | |
| 542 // After more complete mark sweep, allocate in old generation. | |
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543 if (result == NULL) { |
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544 result = old_gen()->allocate(size); |
| 0 | 545 } |
| 546 | |
| 547 return result; | |
| 548 } | |
| 549 | |
| 550 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 551 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 552 young_gen()->eden_space()->ensure_parsability(); | |
| 553 } | |
| 554 | |
| 555 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 556 return young_gen()->eden_space()->free_in_bytes(); | |
| 557 } | |
| 558 | |
| 559 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 560 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 561 } | |
| 562 | |
| 563 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 564 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 565 } | |
| 566 | |
| 567 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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568 return young_gen()->allocate(size); |
| 0 | 569 } |
| 570 | |
| 571 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 572 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 573 } | |
| 574 | |
| 575 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 576 CollectedHeap::resize_all_tlabs(); | |
| 577 } | |
| 578 | |
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579 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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580 // We don't need barriers for stores to objects in the |
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581 // young gen and, a fortiori, for initializing stores to |
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582 // objects therein. |
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583 return is_in_young(new_obj); |
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584 } |
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585 |
| 0 | 586 // This method is used by System.gc() and JVMTI. |
| 587 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 588 assert(!Heap_lock->owned_by_self(), | |
| 589 "this thread should not own the Heap_lock"); | |
| 590 | |
| 591 unsigned int gc_count = 0; | |
| 592 unsigned int full_gc_count = 0; | |
| 593 { | |
| 594 MutexLocker ml(Heap_lock); | |
| 595 // This value is guarded by the Heap_lock | |
| 596 gc_count = Universe::heap()->total_collections(); | |
| 597 full_gc_count = Universe::heap()->total_full_collections(); | |
| 598 } | |
| 599 | |
| 600 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 601 VMThread::execute(&op); | |
| 602 } | |
| 603 | |
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604 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 605 Unimplemented(); |
| 606 } | |
| 607 | |
| 608 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 609 young_gen()->object_iterate(cl); | |
| 610 old_gen()->object_iterate(cl); | |
| 611 } | |
| 612 | |
| 613 | |
| 614 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 615 if (young_gen()->is_in_reserved(addr)) { | |
| 616 assert(young_gen()->is_in(addr), | |
| 617 "addr should be in allocated part of young gen"); | |
| 1907 | 618 // called from os::print_location by find or VMError |
| 619 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
| 0 | 620 Unimplemented(); |
| 621 } else if (old_gen()->is_in_reserved(addr)) { | |
| 622 assert(old_gen()->is_in(addr), | |
| 623 "addr should be in allocated part of old gen"); | |
| 624 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 625 } | |
| 626 return 0; | |
| 627 } | |
| 628 | |
| 629 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 630 return oop(addr)->size(); | |
| 631 } | |
| 632 | |
| 633 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 634 return block_start(addr) == addr; | |
| 635 } | |
| 636 | |
| 637 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 638 return UseParallelOldGC ? | |
| 639 PSParallelCompact::millis_since_last_gc() : | |
| 640 PSMarkSweep::millis_since_last_gc(); | |
| 641 } | |
| 642 | |
| 643 void ParallelScavengeHeap::prepare_for_verify() { | |
| 644 ensure_parsability(false); // no need to retire TLABs for verification | |
| 645 } | |
| 646 | |
| 10405 | 647 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() { |
| 648 PSOldGen* old = old_gen(); | |
| 649 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr(); | |
| 650 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end()); | |
| 651 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes()); | |
| 652 | |
| 653 PSYoungGen* young = young_gen(); | |
| 654 VirtualSpaceSummary young_summary(young->reserved().start(), | |
| 655 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end()); | |
| 656 | |
| 657 MutableSpace* eden = young_gen()->eden_space(); | |
| 658 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes()); | |
| 659 | |
| 660 MutableSpace* from = young_gen()->from_space(); | |
| 661 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes()); | |
| 662 | |
| 663 MutableSpace* to = young_gen()->to_space(); | |
| 664 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes()); | |
| 665 | |
| 666 VirtualSpaceSummary heap_summary = create_heap_space_summary(); | |
| 667 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space); | |
| 668 } | |
| 669 | |
| 0 | 670 void ParallelScavengeHeap::print_on(outputStream* st) const { |
| 671 young_gen()->print_on(st); | |
| 672 old_gen()->print_on(st); | |
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673 MetaspaceAux::print_on(st); |
| 0 | 674 } |
| 675 | |
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676 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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677 this->CollectedHeap::print_on_error(st); |
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678 |
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679 if (UseParallelOldGC) { |
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680 st->cr(); |
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681 PSParallelCompact::print_on_error(st); |
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682 } |
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683 } |
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684 |
| 0 | 685 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
| 686 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 687 } | |
| 688 | |
| 689 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 690 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 691 } | |
| 692 | |
| 693 void ParallelScavengeHeap::print_tracing_info() const { | |
| 694 if (TraceGen0Time) { | |
| 695 double time = PSScavenge::accumulated_time()->seconds(); | |
| 696 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 697 } | |
| 698 if (TraceGen1Time) { | |
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699 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
| 0 | 700 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
| 701 } | |
| 702 } | |
| 703 | |
| 704 | |
| 6008 | 705 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 706 // Why do we need the total_collections()-filter below? |
| 707 if (total_collections() > 0) { | |
| 708 if (!silent) { | |
| 709 gclog_or_tty->print("tenured "); | |
| 710 } | |
| 6008 | 711 old_gen()->verify(); |
| 0 | 712 |
| 713 if (!silent) { | |
| 714 gclog_or_tty->print("eden "); | |
| 715 } | |
| 6008 | 716 young_gen()->verify(); |
| 0 | 717 } |
| 718 } | |
| 719 | |
| 720 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 721 if (PrintGCDetails && Verbose) { | |
| 722 gclog_or_tty->print(" " SIZE_FORMAT | |
| 723 "->" SIZE_FORMAT | |
| 724 "(" SIZE_FORMAT ")", | |
| 725 prev_used, used(), capacity()); | |
| 726 } else { | |
| 727 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 728 "->" SIZE_FORMAT "K" | |
| 729 "(" SIZE_FORMAT "K)", | |
| 730 prev_used / K, used() / K, capacity() / K); | |
| 731 } | |
| 732 } | |
| 733 | |
| 10405 | 734 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
| 735 const PSHeapSummary& heap_summary = create_ps_heap_summary(); | |
| 736 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); | |
| 737 gc_tracer->report_gc_heap_summary(when, heap_summary, metaspace_summary); | |
| 738 } | |
| 739 | |
| 0 | 740 ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
| 741 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 742 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 743 return _psh; | |
| 744 } | |
| 745 | |
| 746 // Before delegating the resize to the young generation, | |
| 747 // the reserved space for the young and old generations | |
| 748 // may be changed to accomodate the desired resize. | |
| 749 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 750 size_t survivor_size) { | |
| 751 if (UseAdaptiveGCBoundary) { | |
| 752 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 753 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 754 return; // The generation changed size already. | |
| 755 } | |
| 756 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 757 } | |
| 758 | |
| 759 // Delegate the resize to the generation. | |
| 760 _young_gen->resize(eden_size, survivor_size); | |
| 761 } | |
| 762 | |
| 763 // Before delegating the resize to the old generation, | |
| 764 // the reserved space for the young and old generations | |
| 765 // may be changed to accomodate the desired resize. | |
| 766 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 767 if (UseAdaptiveGCBoundary) { | |
| 768 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 769 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 770 return; // The generation changed size already. | |
| 771 } | |
| 772 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 773 } | |
| 774 | |
| 775 // Delegate the resize to the generation. | |
| 776 _old_gen->resize(desired_free_space); | |
| 777 } | |
|
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778 |
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779 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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780 // nothing particular |
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781 } |
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782 |
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783 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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784 // nothing particular |
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785 } |
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786 |
|
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787 #ifndef PRODUCT |
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788 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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789 if (ZapUnusedHeapArea) { |
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790 young_gen()->record_spaces_top(); |
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791 old_gen()->record_spaces_top(); |
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792 } |
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793 } |
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794 |
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795 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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796 if (ZapUnusedHeapArea) { |
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797 young_gen()->eden_space()->mangle_unused_area(); |
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798 young_gen()->to_space()->mangle_unused_area(); |
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799 young_gen()->from_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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800 old_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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801 } |
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12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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802 } |
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12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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803 #endif |