Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 13060:8f07aa079343
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
7057939: jmap shows MaxNewSize=4GB when Java is using parallel collector
Summary: Major cleanup of the collectorpolicy classes
Reviewed-by: tschatzl, jcoomes
| author | jwilhelm |
|---|---|
| date | Fri, 01 Nov 2013 17:09:38 +0100 |
| parents | 1a8fb39bdbc4 |
| children | ff355e26c78d cfd4aac53239 |
| 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 jint ParallelScavengeHeap::initialize() { | |
| 1166 | 56 CollectedHeap::pre_initialize(); |
| 57 | |
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58 // Initialize collector policy |
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59 _collector_policy = new GenerationSizer(); |
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60 _collector_policy->initialize_all(); |
| 0 | 61 |
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62 const size_t heap_size = _collector_policy->max_heap_byte_size(); |
| 0 | 63 |
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64 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, _collector_policy->heap_alignment()); |
| 6197 | 65 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
| 66 | |
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67 os::trace_page_sizes("ps main", _collector_policy->min_heap_byte_size(), |
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68 heap_size, generation_alignment(), |
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69 heap_rs.base(), |
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70 heap_rs.size()); |
| 0 | 71 if (!heap_rs.is_reserved()) { |
| 72 vm_shutdown_during_initialization( | |
| 73 "Could not reserve enough space for object heap"); | |
| 74 return JNI_ENOMEM; | |
| 75 } | |
| 76 | |
| 77 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 78 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 79 | |
| 80 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 81 _barrier_set = barrier_set; | |
| 82 oopDesc::set_bs(_barrier_set); | |
| 83 if (_barrier_set == NULL) { | |
| 84 vm_shutdown_during_initialization( | |
| 85 "Could not reserve enough space for barrier set"); | |
| 86 return JNI_ENOMEM; | |
| 87 } | |
| 88 | |
| 89 // Make up the generations | |
| 90 // Calculate the maximum size that a generation can grow. This | |
| 91 // includes growth into the other generation. Note that the | |
| 92 // parameter _max_gen_size is kept as the maximum | |
| 93 // size of the generation as the boundaries currently stand. | |
| 94 // _max_gen_size is still used as that value. | |
| 95 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 96 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 97 | |
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98 _gens = new AdjoiningGenerations(heap_rs, _collector_policy, generation_alignment()); |
| 0 | 99 |
| 100 _old_gen = _gens->old_gen(); | |
| 101 _young_gen = _gens->young_gen(); | |
| 102 | |
| 103 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 104 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 105 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 106 _size_policy = | |
| 107 new PSAdaptiveSizePolicy(eden_capacity, | |
| 108 initial_promo_size, | |
| 109 young_gen()->to_space()->capacity_in_bytes(), | |
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110 _collector_policy->gen_alignment(), |
| 0 | 111 max_gc_pause_sec, |
| 112 max_gc_minor_pause_sec, | |
| 113 GCTimeRatio | |
| 114 ); | |
| 115 | |
| 116 assert(!UseAdaptiveGCBoundary || | |
| 117 (old_gen()->virtual_space()->high_boundary() == | |
| 118 young_gen()->virtual_space()->low_boundary()), | |
| 119 "Boundaries must meet"); | |
| 120 // initialize the policy counters - 2 collectors, 3 generations | |
| 121 _gc_policy_counters = | |
| 122 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 123 _psh = this; | |
| 124 | |
| 125 // Set up the GCTaskManager | |
| 126 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 127 | |
| 128 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 129 return JNI_ENOMEM; | |
| 130 } | |
| 131 | |
| 132 return JNI_OK; | |
| 133 } | |
| 134 | |
| 135 void ParallelScavengeHeap::post_initialize() { | |
| 136 // Need to init the tenuring threshold | |
| 137 PSScavenge::initialize(); | |
| 138 if (UseParallelOldGC) { | |
| 139 PSParallelCompact::post_initialize(); | |
| 140 } else { | |
| 141 PSMarkSweep::initialize(); | |
| 142 } | |
| 143 PSPromotionManager::initialize(); | |
| 144 } | |
| 145 | |
| 146 void ParallelScavengeHeap::update_counters() { | |
| 147 young_gen()->update_counters(); | |
| 148 old_gen()->update_counters(); | |
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149 MetaspaceCounters::update_performance_counters(); |
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150 CompressedClassSpaceCounters::update_performance_counters(); |
| 0 | 151 } |
| 152 | |
| 153 size_t ParallelScavengeHeap::capacity() const { | |
| 154 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 155 return value; | |
| 156 } | |
| 157 | |
| 158 size_t ParallelScavengeHeap::used() const { | |
| 159 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 160 return value; | |
| 161 } | |
| 162 | |
| 163 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 164 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 165 } | |
| 166 | |
| 167 | |
| 168 size_t ParallelScavengeHeap::max_capacity() const { | |
| 169 size_t estimated = reserved_region().byte_size(); | |
| 170 if (UseAdaptiveSizePolicy) { | |
| 171 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 172 } else { | |
| 173 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 174 } | |
| 175 return MAX2(estimated, capacity()); | |
| 176 } | |
| 177 | |
| 178 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 179 if (young_gen()->is_in(p)) { | |
| 180 return true; | |
| 181 } | |
| 182 | |
| 183 if (old_gen()->is_in(p)) { | |
| 184 return true; | |
| 185 } | |
| 186 | |
| 187 return false; | |
| 188 } | |
| 189 | |
| 190 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 191 if (young_gen()->is_in_reserved(p)) { | |
| 192 return true; | |
| 193 } | |
| 194 | |
| 195 if (old_gen()->is_in_reserved(p)) { | |
| 196 return true; | |
| 197 } | |
| 198 | |
| 199 return false; | |
| 200 } | |
| 201 | |
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202 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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203 return is_in_young((oop)addr); |
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204 } |
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205 |
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206 #ifdef ASSERT |
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207 // Don't implement this by using is_in_young(). This method is used |
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208 // in some cases to check that is_in_young() is correct. |
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209 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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210 assert(is_in_reserved(p) || p == NULL, |
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211 "Does not work if address is non-null and outside of the heap"); |
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212 // The order of the generations is old (low addr), young (high addr) |
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213 return p >= old_gen()->reserved().end(); |
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214 } |
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215 #endif |
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216 |
| 0 | 217 // There are two levels of allocation policy here. |
| 218 // | |
| 219 // When an allocation request fails, the requesting thread must invoke a VM | |
| 220 // operation, transfer control to the VM thread, and await the results of a | |
| 221 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 222 // multiple times if possible. | |
| 223 // | |
| 224 // To accomplish this, we have a basic allocation policy, and also a | |
| 225 // failed allocation policy. | |
| 226 // | |
| 227 // The basic allocation policy controls how you allocate memory without | |
| 228 // attempting garbage collection. It is okay to grab locks and | |
| 229 // expand the heap, if that can be done without coming to a safepoint. | |
| 230 // It is likely that the basic allocation policy will not be very | |
| 231 // aggressive. | |
| 232 // | |
| 233 // The failed allocation policy is invoked from the VM thread after | |
| 234 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 235 // request. This policy needs to cover the entire range of collection, | |
| 236 // heap expansion, and out-of-memory conditions. It should make every | |
| 237 // attempt to allocate the requested memory. | |
| 238 | |
| 239 // Basic allocation policy. Should never be called at a safepoint, or | |
| 240 // from the VM thread. | |
| 241 // | |
| 242 // This method must handle cases where many mem_allocate requests fail | |
| 243 // simultaneously. When that happens, only one VM operation will succeed, | |
| 244 // and the rest will not be executed. For that reason, this method loops | |
| 245 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 246 // we rely on the size_policy object to force a bail out. | |
| 247 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 248 size_t size, | |
| 249 bool* gc_overhead_limit_was_exceeded) { | |
| 250 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 251 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 252 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 253 | |
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254 // In general gc_overhead_limit_was_exceeded should be false so |
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255 // set it so here and reset it to true only if the gc time |
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256 // limit is being exceeded as checked below. |
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257 *gc_overhead_limit_was_exceeded = false; |
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258 |
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259 HeapWord* result = young_gen()->allocate(size); |
| 0 | 260 |
| 261 uint loop_count = 0; | |
| 262 uint gc_count = 0; | |
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263 int gclocker_stalled_count = 0; |
| 0 | 264 |
| 265 while (result == NULL) { | |
| 266 // We don't want to have multiple collections for a single filled generation. | |
| 267 // To prevent this, each thread tracks the total_collections() value, and if | |
| 268 // the count has changed, does not do a new collection. | |
| 269 // | |
| 270 // The collection count must be read only while holding the heap lock. VM | |
| 271 // operations also hold the heap lock during collections. There is a lock | |
| 272 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 273 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 274 // the collection count has already changed. To prevent duplicate collections, | |
| 275 // The policy MUST attempt allocations during the same period it reads the | |
| 276 // total_collections() value! | |
| 277 { | |
| 278 MutexLocker ml(Heap_lock); | |
| 279 gc_count = Universe::heap()->total_collections(); | |
| 280 | |
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281 result = young_gen()->allocate(size); |
| 0 | 282 if (result != NULL) { |
| 283 return result; | |
| 284 } | |
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285 |
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286 // If certain conditions hold, try allocating from the old gen. |
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287 result = mem_allocate_old_gen(size); |
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288 if (result != NULL) { |
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289 return result; |
| 0 | 290 } |
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291 |
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292 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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293 return NULL; |
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294 } |
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295 |
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296 // Failed to allocate without a gc. |
| 0 | 297 if (GC_locker::is_active_and_needs_gc()) { |
| 298 // If this thread is not in a jni critical section, we stall | |
| 299 // the requestor until the critical section has cleared and | |
| 300 // GC allowed. When the critical section clears, a GC is | |
| 301 // initiated by the last thread exiting the critical section; so | |
| 302 // we retry the allocation sequence from the beginning of the loop, | |
| 303 // rather than causing more, now probably unnecessary, GC attempts. | |
| 304 JavaThread* jthr = JavaThread::current(); | |
| 305 if (!jthr->in_critical()) { | |
| 306 MutexUnlocker mul(Heap_lock); | |
| 307 GC_locker::stall_until_clear(); | |
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308 gclocker_stalled_count += 1; |
| 0 | 309 continue; |
| 310 } else { | |
| 311 if (CheckJNICalls) { | |
| 312 fatal("Possible deadlock due to allocating while" | |
| 313 " in jni critical section"); | |
| 314 } | |
| 315 return NULL; | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 if (result == NULL) { | |
| 321 // Generate a VM operation | |
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322 VM_ParallelGCFailedAllocation op(size, gc_count); |
| 0 | 323 VMThread::execute(&op); |
| 324 | |
| 325 // Did the VM operation execute? If so, return the result directly. | |
| 326 // This prevents us from looping until time out on requests that can | |
| 327 // not be satisfied. | |
| 328 if (op.prologue_succeeded()) { | |
| 329 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 330 "result not in heap"); | |
| 331 | |
| 332 // If GC was locked out during VM operation then retry allocation | |
| 333 // and/or stall as necessary. | |
| 334 if (op.gc_locked()) { | |
| 335 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 336 continue; // retry and/or stall as necessary | |
| 337 } | |
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338 |
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339 // Exit the loop if the gc time limit has been exceeded. |
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340 // The allocation must have failed above ("result" guarding |
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341 // this path is NULL) and the most recent collection has exceeded the |
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342 // gc overhead limit (although enough may have been collected to |
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343 // satisfy the allocation). Exit the loop so that an out-of-memory |
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344 // will be thrown (return a NULL ignoring the contents of |
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345 // op.result()), |
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346 // but clear gc_overhead_limit_exceeded so that the next collection |
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347 // starts with a clean slate (i.e., forgets about previous overhead |
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348 // excesses). Fill op.result() with a filler object so that the |
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349 // heap remains parsable. |
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350 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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351 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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352 |
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353 if (limit_exceeded && softrefs_clear) { |
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354 *gc_overhead_limit_was_exceeded = true; |
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355 size_policy()->set_gc_overhead_limit_exceeded(false); |
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356 if (PrintGCDetails && Verbose) { |
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357 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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358 "return NULL because gc_overhead_limit_exceeded is set"); |
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359 } |
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360 if (op.result() != NULL) { |
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361 CollectedHeap::fill_with_object(op.result(), size); |
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362 } |
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363 return NULL; |
| 0 | 364 } |
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365 |
| 0 | 366 return op.result(); |
| 367 } | |
| 368 } | |
| 369 | |
| 370 // The policy object will prevent us from looping forever. If the | |
| 371 // time spent in gc crosses a threshold, we will bail out. | |
| 372 loop_count++; | |
| 373 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 374 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 375 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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376 " size=%d", loop_count, size); |
| 0 | 377 } |
| 378 } | |
| 379 | |
| 380 return result; | |
| 381 } | |
| 382 | |
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383 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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384 // done before each allocation, and after the full gc the allocation still |
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385 // cannot be satisfied from the young gen. This routine detects that condition; |
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386 // it should be called after a full gc has been done and the allocation |
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387 // attempted from the young gen. The parameter 'addr' should be the result of |
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388 // that young gen allocation attempt. |
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389 void |
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390 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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391 if (addr != NULL) { |
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392 _death_march_count = 0; // death march has ended |
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393 } else if (_death_march_count == 0) { |
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394 if (should_alloc_in_eden(size)) { |
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395 _death_march_count = 1; // death march has started |
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396 } |
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397 } |
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398 } |
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399 |
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400 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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401 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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402 // Size is too big for eden, or gc is locked out. |
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403 return old_gen()->allocate(size); |
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404 } |
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405 |
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406 // If a "death march" is in progress, allocate from the old gen a limited |
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407 // number of times before doing a GC. |
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408 if (_death_march_count > 0) { |
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409 if (_death_march_count < 64) { |
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410 ++_death_march_count; |
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411 return old_gen()->allocate(size); |
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412 } else { |
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413 _death_march_count = 0; |
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414 } |
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415 } |
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416 return NULL; |
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417 } |
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418 |
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419 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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420 if (UseParallelOldGC) { |
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421 // The do_full_collection() parameter clear_all_soft_refs |
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422 // is interpreted here as maximum_compaction which will |
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423 // cause SoftRefs to be cleared. |
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424 bool maximum_compaction = clear_all_soft_refs; |
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425 PSParallelCompact::invoke(maximum_compaction); |
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426 } else { |
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427 PSMarkSweep::invoke(clear_all_soft_refs); |
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428 } |
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429 } |
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430 |
| 0 | 431 // Failed allocation policy. Must be called from the VM thread, and |
| 432 // only at a safepoint! Note that this method has policy for allocation | |
| 433 // flow, and NOT collection policy. So we do not check for gc collection | |
| 434 // time over limit here, that is the responsibility of the heap specific | |
| 435 // collection methods. This method decides where to attempt allocations, | |
| 436 // and when to attempt collections, but no collection specific policy. | |
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437 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
| 0 | 438 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 439 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 440 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 441 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 442 | |
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443 // We assume that allocation in eden will fail unless we collect. |
| 0 | 444 |
| 445 // First level allocation failure, scavenge and allocate in young gen. | |
| 446 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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447 const bool invoked_full_gc = PSScavenge::invoke(); |
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448 HeapWord* result = young_gen()->allocate(size); |
| 0 | 449 |
| 450 // Second level allocation failure. | |
| 451 // Mark sweep and allocate in young generation. | |
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452 if (result == NULL && !invoked_full_gc) { |
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453 do_full_collection(false); |
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454 result = young_gen()->allocate(size); |
| 0 | 455 } |
| 456 | |
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457 death_march_check(result, size); |
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458 |
| 0 | 459 // Third level allocation failure. |
| 460 // After mark sweep and young generation allocation failure, | |
| 461 // allocate in old generation. | |
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462 if (result == NULL) { |
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463 result = old_gen()->allocate(size); |
| 0 | 464 } |
| 465 | |
| 466 // Fourth level allocation failure. We're running out of memory. | |
| 467 // More complete mark sweep and allocate in young generation. | |
| 468 if (result == NULL) { | |
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469 do_full_collection(true); |
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470 result = young_gen()->allocate(size); |
| 0 | 471 } |
| 472 | |
| 473 // Fifth level allocation failure. | |
| 474 // After more complete mark sweep, allocate in old generation. | |
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475 if (result == NULL) { |
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476 result = old_gen()->allocate(size); |
| 0 | 477 } |
| 478 | |
| 479 return result; | |
| 480 } | |
| 481 | |
| 482 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 483 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 484 young_gen()->eden_space()->ensure_parsability(); | |
| 485 } | |
| 486 | |
| 487 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 488 return young_gen()->eden_space()->free_in_bytes(); | |
| 489 } | |
| 490 | |
| 491 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 492 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 493 } | |
| 494 | |
| 495 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 496 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 497 } | |
| 498 | |
| 499 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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500 return young_gen()->allocate(size); |
| 0 | 501 } |
| 502 | |
| 503 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 504 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 505 } | |
| 506 | |
| 507 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 508 CollectedHeap::resize_all_tlabs(); | |
| 509 } | |
| 510 | |
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511 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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512 // We don't need barriers for stores to objects in the |
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513 // young gen and, a fortiori, for initializing stores to |
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514 // objects therein. |
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515 return is_in_young(new_obj); |
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516 } |
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517 |
| 0 | 518 // This method is used by System.gc() and JVMTI. |
| 519 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 520 assert(!Heap_lock->owned_by_self(), | |
| 521 "this thread should not own the Heap_lock"); | |
| 522 | |
| 523 unsigned int gc_count = 0; | |
| 524 unsigned int full_gc_count = 0; | |
| 525 { | |
| 526 MutexLocker ml(Heap_lock); | |
| 527 // This value is guarded by the Heap_lock | |
| 528 gc_count = Universe::heap()->total_collections(); | |
| 529 full_gc_count = Universe::heap()->total_full_collections(); | |
| 530 } | |
| 531 | |
| 532 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 533 VMThread::execute(&op); | |
| 534 } | |
| 535 | |
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536 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 537 Unimplemented(); |
| 538 } | |
| 539 | |
| 540 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 541 young_gen()->object_iterate(cl); | |
| 542 old_gen()->object_iterate(cl); | |
| 543 } | |
| 544 | |
| 545 | |
| 546 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 547 if (young_gen()->is_in_reserved(addr)) { | |
| 548 assert(young_gen()->is_in(addr), | |
| 549 "addr should be in allocated part of young gen"); | |
| 1907 | 550 // called from os::print_location by find or VMError |
| 551 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
| 0 | 552 Unimplemented(); |
| 553 } else if (old_gen()->is_in_reserved(addr)) { | |
| 554 assert(old_gen()->is_in(addr), | |
| 555 "addr should be in allocated part of old gen"); | |
| 556 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 557 } | |
| 558 return 0; | |
| 559 } | |
| 560 | |
| 561 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 562 return oop(addr)->size(); | |
| 563 } | |
| 564 | |
| 565 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 566 return block_start(addr) == addr; | |
| 567 } | |
| 568 | |
| 569 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 570 return UseParallelOldGC ? | |
| 571 PSParallelCompact::millis_since_last_gc() : | |
| 572 PSMarkSweep::millis_since_last_gc(); | |
| 573 } | |
| 574 | |
| 575 void ParallelScavengeHeap::prepare_for_verify() { | |
| 576 ensure_parsability(false); // no need to retire TLABs for verification | |
| 577 } | |
| 578 | |
| 10405 | 579 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() { |
| 580 PSOldGen* old = old_gen(); | |
| 581 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr(); | |
| 582 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end()); | |
| 583 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes()); | |
| 584 | |
| 585 PSYoungGen* young = young_gen(); | |
| 586 VirtualSpaceSummary young_summary(young->reserved().start(), | |
| 587 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end()); | |
| 588 | |
| 589 MutableSpace* eden = young_gen()->eden_space(); | |
| 590 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes()); | |
| 591 | |
| 592 MutableSpace* from = young_gen()->from_space(); | |
| 593 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes()); | |
| 594 | |
| 595 MutableSpace* to = young_gen()->to_space(); | |
| 596 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes()); | |
| 597 | |
| 598 VirtualSpaceSummary heap_summary = create_heap_space_summary(); | |
| 599 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space); | |
| 600 } | |
| 601 | |
| 0 | 602 void ParallelScavengeHeap::print_on(outputStream* st) const { |
| 603 young_gen()->print_on(st); | |
| 604 old_gen()->print_on(st); | |
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605 MetaspaceAux::print_on(st); |
| 0 | 606 } |
| 607 | |
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608 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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609 this->CollectedHeap::print_on_error(st); |
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610 |
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611 if (UseParallelOldGC) { |
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612 st->cr(); |
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613 PSParallelCompact::print_on_error(st); |
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614 } |
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615 } |
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616 |
| 0 | 617 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
| 618 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 619 } | |
| 620 | |
| 621 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 622 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 623 } | |
| 624 | |
| 625 void ParallelScavengeHeap::print_tracing_info() const { | |
| 626 if (TraceGen0Time) { | |
| 627 double time = PSScavenge::accumulated_time()->seconds(); | |
| 628 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 629 } | |
| 630 if (TraceGen1Time) { | |
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631 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
| 0 | 632 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
| 633 } | |
| 634 } | |
| 635 | |
| 636 | |
| 6008 | 637 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 638 // Why do we need the total_collections()-filter below? |
| 639 if (total_collections() > 0) { | |
| 640 if (!silent) { | |
| 641 gclog_or_tty->print("tenured "); | |
| 642 } | |
| 6008 | 643 old_gen()->verify(); |
| 0 | 644 |
| 645 if (!silent) { | |
| 646 gclog_or_tty->print("eden "); | |
| 647 } | |
| 6008 | 648 young_gen()->verify(); |
| 0 | 649 } |
| 650 } | |
| 651 | |
| 652 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 653 if (PrintGCDetails && Verbose) { | |
| 654 gclog_or_tty->print(" " SIZE_FORMAT | |
| 655 "->" SIZE_FORMAT | |
| 656 "(" SIZE_FORMAT ")", | |
| 657 prev_used, used(), capacity()); | |
| 658 } else { | |
| 659 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 660 "->" SIZE_FORMAT "K" | |
| 661 "(" SIZE_FORMAT "K)", | |
| 662 prev_used / K, used() / K, capacity() / K); | |
| 663 } | |
| 664 } | |
| 665 | |
| 10405 | 666 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
| 667 const PSHeapSummary& heap_summary = create_ps_heap_summary(); | |
| 668 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); | |
| 669 gc_tracer->report_gc_heap_summary(when, heap_summary, metaspace_summary); | |
| 670 } | |
| 671 | |
| 0 | 672 ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
| 673 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 674 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 675 return _psh; | |
| 676 } | |
| 677 | |
| 678 // Before delegating the resize to the young generation, | |
| 679 // the reserved space for the young and old generations | |
| 680 // may be changed to accomodate the desired resize. | |
| 681 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 682 size_t survivor_size) { | |
| 683 if (UseAdaptiveGCBoundary) { | |
| 684 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 685 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 686 return; // The generation changed size already. | |
| 687 } | |
| 688 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 689 } | |
| 690 | |
| 691 // Delegate the resize to the generation. | |
| 692 _young_gen->resize(eden_size, survivor_size); | |
| 693 } | |
| 694 | |
| 695 // Before delegating the resize to the old generation, | |
| 696 // the reserved space for the young and old generations | |
| 697 // may be changed to accomodate the desired resize. | |
| 698 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 699 if (UseAdaptiveGCBoundary) { | |
| 700 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 701 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 702 return; // The generation changed size already. | |
| 703 } | |
| 704 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 705 } | |
| 706 | |
| 707 // Delegate the resize to the generation. | |
| 708 _old_gen->resize(desired_free_space); | |
| 709 } | |
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710 |
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711 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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712 // nothing particular |
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713 } |
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714 |
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715 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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716 // nothing particular |
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717 } |
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718 |
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719 #ifndef PRODUCT |
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720 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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721 if (ZapUnusedHeapArea) { |
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722 young_gen()->record_spaces_top(); |
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723 old_gen()->record_spaces_top(); |
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724 } |
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725 } |
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726 |
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727 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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728 if (ZapUnusedHeapArea) { |
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729 young_gen()->eden_space()->mangle_unused_area(); |
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730 young_gen()->to_space()->mangle_unused_area(); |
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731 young_gen()->from_space()->mangle_unused_area(); |
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732 old_gen()->object_space()->mangle_unused_area(); |
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733 } |
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734 } |
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735 #endif |