Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | 7848fc12602b |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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); | |
20337 | 81 barrier_set->initialize(); |
0 | 82 _barrier_set = barrier_set; |
83 oopDesc::set_bs(_barrier_set); | |
84 if (_barrier_set == NULL) { | |
85 vm_shutdown_during_initialization( | |
86 "Could not reserve enough space for barrier set"); | |
87 return JNI_ENOMEM; | |
88 } | |
89 | |
90 // Make up the generations | |
91 // Calculate the maximum size that a generation can grow. This | |
92 // includes growth into the other generation. Note that the | |
93 // parameter _max_gen_size is kept as the maximum | |
94 // size of the generation as the boundaries currently stand. | |
95 // _max_gen_size is still used as that value. | |
96 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
97 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
98 | |
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99 _gens = new AdjoiningGenerations(heap_rs, _collector_policy, generation_alignment()); |
0 | 100 |
101 _old_gen = _gens->old_gen(); | |
102 _young_gen = _gens->young_gen(); | |
103 | |
104 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
105 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
106 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
107 _size_policy = | |
108 new PSAdaptiveSizePolicy(eden_capacity, | |
109 initial_promo_size, | |
110 young_gen()->to_space()->capacity_in_bytes(), | |
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111 _collector_policy->gen_alignment(), |
0 | 112 max_gc_pause_sec, |
113 max_gc_minor_pause_sec, | |
114 GCTimeRatio | |
115 ); | |
116 | |
117 assert(!UseAdaptiveGCBoundary || | |
118 (old_gen()->virtual_space()->high_boundary() == | |
119 young_gen()->virtual_space()->low_boundary()), | |
120 "Boundaries must meet"); | |
121 // initialize the policy counters - 2 collectors, 3 generations | |
122 _gc_policy_counters = | |
123 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
124 _psh = this; | |
125 | |
126 // Set up the GCTaskManager | |
127 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
128 | |
129 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
130 return JNI_ENOMEM; | |
131 } | |
132 | |
133 return JNI_OK; | |
134 } | |
135 | |
136 void ParallelScavengeHeap::post_initialize() { | |
137 // Need to init the tenuring threshold | |
138 PSScavenge::initialize(); | |
139 if (UseParallelOldGC) { | |
140 PSParallelCompact::post_initialize(); | |
141 } else { | |
142 PSMarkSweep::initialize(); | |
143 } | |
144 PSPromotionManager::initialize(); | |
145 } | |
146 | |
147 void ParallelScavengeHeap::update_counters() { | |
148 young_gen()->update_counters(); | |
149 old_gen()->update_counters(); | |
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150 MetaspaceCounters::update_performance_counters(); |
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151 CompressedClassSpaceCounters::update_performance_counters(); |
0 | 152 } |
153 | |
154 size_t ParallelScavengeHeap::capacity() const { | |
155 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
156 return value; | |
157 } | |
158 | |
159 size_t ParallelScavengeHeap::used() const { | |
160 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
161 return value; | |
162 } | |
163 | |
164 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
165 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
166 } | |
167 | |
168 | |
169 size_t ParallelScavengeHeap::max_capacity() const { | |
170 size_t estimated = reserved_region().byte_size(); | |
171 if (UseAdaptiveSizePolicy) { | |
172 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
173 } else { | |
174 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
175 } | |
176 return MAX2(estimated, capacity()); | |
177 } | |
178 | |
179 bool ParallelScavengeHeap::is_in(const void* p) const { | |
180 if (young_gen()->is_in(p)) { | |
181 return true; | |
182 } | |
183 | |
184 if (old_gen()->is_in(p)) { | |
185 return true; | |
186 } | |
187 | |
188 return false; | |
189 } | |
190 | |
191 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
192 if (young_gen()->is_in_reserved(p)) { | |
193 return true; | |
194 } | |
195 | |
196 if (old_gen()->is_in_reserved(p)) { | |
197 return true; | |
198 } | |
199 | |
200 return false; | |
201 } | |
202 | |
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203 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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204 return is_in_young((oop)addr); |
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205 } |
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206 |
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207 #ifdef ASSERT |
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208 // Don't implement this by using is_in_young(). This method is used |
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209 // in some cases to check that is_in_young() is correct. |
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210 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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211 assert(is_in_reserved(p) || p == NULL, |
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212 "Does not work if address is non-null and outside of the heap"); |
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213 // The order of the generations is old (low addr), young (high addr) |
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214 return p >= old_gen()->reserved().end(); |
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215 } |
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216 #endif |
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217 |
0 | 218 // There are two levels of allocation policy here. |
219 // | |
220 // When an allocation request fails, the requesting thread must invoke a VM | |
221 // operation, transfer control to the VM thread, and await the results of a | |
222 // garbage collection. That is quite expensive, and we should avoid doing it | |
223 // multiple times if possible. | |
224 // | |
225 // To accomplish this, we have a basic allocation policy, and also a | |
226 // failed allocation policy. | |
227 // | |
228 // The basic allocation policy controls how you allocate memory without | |
229 // attempting garbage collection. It is okay to grab locks and | |
230 // expand the heap, if that can be done without coming to a safepoint. | |
231 // It is likely that the basic allocation policy will not be very | |
232 // aggressive. | |
233 // | |
234 // The failed allocation policy is invoked from the VM thread after | |
235 // the basic allocation policy is unable to satisfy a mem_allocate | |
236 // request. This policy needs to cover the entire range of collection, | |
237 // heap expansion, and out-of-memory conditions. It should make every | |
238 // attempt to allocate the requested memory. | |
239 | |
240 // Basic allocation policy. Should never be called at a safepoint, or | |
241 // from the VM thread. | |
242 // | |
243 // This method must handle cases where many mem_allocate requests fail | |
244 // simultaneously. When that happens, only one VM operation will succeed, | |
245 // and the rest will not be executed. For that reason, this method loops | |
246 // during failed allocation attempts. If the java heap becomes exhausted, | |
247 // we rely on the size_policy object to force a bail out. | |
248 HeapWord* ParallelScavengeHeap::mem_allocate( | |
249 size_t size, | |
250 bool* gc_overhead_limit_was_exceeded) { | |
251 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
252 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
253 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
254 | |
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255 // In general gc_overhead_limit_was_exceeded should be false so |
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256 // set it so here and reset it to true only if the gc time |
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257 // limit is being exceeded as checked below. |
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258 *gc_overhead_limit_was_exceeded = false; |
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259 |
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260 HeapWord* result = young_gen()->allocate(size); |
0 | 261 |
262 uint loop_count = 0; | |
263 uint gc_count = 0; | |
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264 int gclocker_stalled_count = 0; |
0 | 265 |
266 while (result == NULL) { | |
267 // We don't want to have multiple collections for a single filled generation. | |
268 // To prevent this, each thread tracks the total_collections() value, and if | |
269 // the count has changed, does not do a new collection. | |
270 // | |
271 // The collection count must be read only while holding the heap lock. VM | |
272 // operations also hold the heap lock during collections. There is a lock | |
273 // contention case where thread A blocks waiting on the Heap_lock, while | |
274 // thread B is holding it doing a collection. When thread A gets the lock, | |
275 // the collection count has already changed. To prevent duplicate collections, | |
276 // The policy MUST attempt allocations during the same period it reads the | |
277 // total_collections() value! | |
278 { | |
279 MutexLocker ml(Heap_lock); | |
280 gc_count = Universe::heap()->total_collections(); | |
281 | |
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282 result = young_gen()->allocate(size); |
0 | 283 if (result != NULL) { |
284 return result; | |
285 } | |
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286 |
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287 // If certain conditions hold, try allocating from the old gen. |
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288 result = mem_allocate_old_gen(size); |
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289 if (result != NULL) { |
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290 return result; |
0 | 291 } |
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292 |
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293 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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294 return NULL; |
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295 } |
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296 |
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297 // Failed to allocate without a gc. |
0 | 298 if (GC_locker::is_active_and_needs_gc()) { |
299 // If this thread is not in a jni critical section, we stall | |
300 // the requestor until the critical section has cleared and | |
301 // GC allowed. When the critical section clears, a GC is | |
302 // initiated by the last thread exiting the critical section; so | |
303 // we retry the allocation sequence from the beginning of the loop, | |
304 // rather than causing more, now probably unnecessary, GC attempts. | |
305 JavaThread* jthr = JavaThread::current(); | |
306 if (!jthr->in_critical()) { | |
307 MutexUnlocker mul(Heap_lock); | |
308 GC_locker::stall_until_clear(); | |
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309 gclocker_stalled_count += 1; |
0 | 310 continue; |
311 } else { | |
312 if (CheckJNICalls) { | |
313 fatal("Possible deadlock due to allocating while" | |
314 " in jni critical section"); | |
315 } | |
316 return NULL; | |
317 } | |
318 } | |
319 } | |
320 | |
321 if (result == NULL) { | |
322 // Generate a VM operation | |
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323 VM_ParallelGCFailedAllocation op(size, gc_count); |
0 | 324 VMThread::execute(&op); |
325 | |
326 // Did the VM operation execute? If so, return the result directly. | |
327 // This prevents us from looping until time out on requests that can | |
328 // not be satisfied. | |
329 if (op.prologue_succeeded()) { | |
330 assert(Universe::heap()->is_in_or_null(op.result()), | |
331 "result not in heap"); | |
332 | |
333 // If GC was locked out during VM operation then retry allocation | |
334 // and/or stall as necessary. | |
335 if (op.gc_locked()) { | |
336 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
337 continue; // retry and/or stall as necessary | |
338 } | |
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339 |
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340 // Exit the loop if the gc time limit has been exceeded. |
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341 // The allocation must have failed above ("result" guarding |
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342 // this path is NULL) and the most recent collection has exceeded the |
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343 // gc overhead limit (although enough may have been collected to |
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344 // satisfy the allocation). Exit the loop so that an out-of-memory |
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345 // will be thrown (return a NULL ignoring the contents of |
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346 // op.result()), |
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347 // but clear gc_overhead_limit_exceeded so that the next collection |
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348 // starts with a clean slate (i.e., forgets about previous overhead |
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349 // excesses). Fill op.result() with a filler object so that the |
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350 // heap remains parsable. |
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351 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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352 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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353 |
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354 if (limit_exceeded && softrefs_clear) { |
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355 *gc_overhead_limit_was_exceeded = true; |
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356 size_policy()->set_gc_overhead_limit_exceeded(false); |
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357 if (PrintGCDetails && Verbose) { |
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358 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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359 "return NULL because gc_overhead_limit_exceeded is set"); |
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360 } |
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361 if (op.result() != NULL) { |
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362 CollectedHeap::fill_with_object(op.result(), size); |
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363 } |
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364 return NULL; |
0 | 365 } |
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366 |
0 | 367 return op.result(); |
368 } | |
369 } | |
370 | |
371 // The policy object will prevent us from looping forever. If the | |
372 // time spent in gc crosses a threshold, we will bail out. | |
373 loop_count++; | |
374 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
375 (loop_count % QueuedAllocationWarningCount == 0)) { | |
376 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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377 " size=" SIZE_FORMAT, loop_count, size); |
0 | 378 } |
379 } | |
380 | |
381 return result; | |
382 } | |
383 | |
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384 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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385 // done before each allocation, and after the full gc the allocation still |
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386 // cannot be satisfied from the young gen. This routine detects that condition; |
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387 // it should be called after a full gc has been done and the allocation |
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388 // attempted from the young gen. The parameter 'addr' should be the result of |
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389 // that young gen allocation attempt. |
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390 void |
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391 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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392 if (addr != NULL) { |
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393 _death_march_count = 0; // death march has ended |
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394 } else if (_death_march_count == 0) { |
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395 if (should_alloc_in_eden(size)) { |
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396 _death_march_count = 1; // death march has started |
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397 } |
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398 } |
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399 } |
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400 |
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401 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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402 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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403 // Size is too big for eden, or gc is locked out. |
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404 return old_gen()->allocate(size); |
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405 } |
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406 |
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407 // If a "death march" is in progress, allocate from the old gen a limited |
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408 // number of times before doing a GC. |
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409 if (_death_march_count > 0) { |
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410 if (_death_march_count < 64) { |
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411 ++_death_march_count; |
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412 return old_gen()->allocate(size); |
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413 } else { |
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414 _death_march_count = 0; |
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415 } |
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416 } |
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417 return NULL; |
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418 } |
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419 |
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420 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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421 if (UseParallelOldGC) { |
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422 // The do_full_collection() parameter clear_all_soft_refs |
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423 // is interpreted here as maximum_compaction which will |
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424 // cause SoftRefs to be cleared. |
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425 bool maximum_compaction = clear_all_soft_refs; |
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426 PSParallelCompact::invoke(maximum_compaction); |
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427 } else { |
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428 PSMarkSweep::invoke(clear_all_soft_refs); |
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429 } |
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430 } |
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431 |
0 | 432 // Failed allocation policy. Must be called from the VM thread, and |
433 // only at a safepoint! Note that this method has policy for allocation | |
434 // flow, and NOT collection policy. So we do not check for gc collection | |
435 // time over limit here, that is the responsibility of the heap specific | |
436 // collection methods. This method decides where to attempt allocations, | |
437 // and when to attempt collections, but no collection specific policy. | |
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438 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
0 | 439 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
440 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
441 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
442 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
443 | |
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444 // We assume that allocation in eden will fail unless we collect. |
0 | 445 |
446 // First level allocation failure, scavenge and allocate in young gen. | |
447 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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448 const bool invoked_full_gc = PSScavenge::invoke(); |
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449 HeapWord* result = young_gen()->allocate(size); |
0 | 450 |
451 // Second level allocation failure. | |
452 // Mark sweep and allocate in young generation. | |
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453 if (result == NULL && !invoked_full_gc) { |
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454 do_full_collection(false); |
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455 result = young_gen()->allocate(size); |
0 | 456 } |
457 | |
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458 death_march_check(result, size); |
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459 |
0 | 460 // Third level allocation failure. |
461 // After mark sweep and young generation allocation failure, | |
462 // allocate in old generation. | |
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463 if (result == NULL) { |
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464 result = old_gen()->allocate(size); |
0 | 465 } |
466 | |
467 // Fourth level allocation failure. We're running out of memory. | |
468 // More complete mark sweep and allocate in young generation. | |
469 if (result == NULL) { | |
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470 do_full_collection(true); |
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471 result = young_gen()->allocate(size); |
0 | 472 } |
473 | |
474 // Fifth level allocation failure. | |
475 // After more complete mark sweep, allocate in old generation. | |
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476 if (result == NULL) { |
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477 result = old_gen()->allocate(size); |
0 | 478 } |
479 | |
480 return result; | |
481 } | |
482 | |
483 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
484 CollectedHeap::ensure_parsability(retire_tlabs); | |
485 young_gen()->eden_space()->ensure_parsability(); | |
486 } | |
487 | |
488 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
489 return young_gen()->eden_space()->tlab_capacity(thr); | |
490 } | |
491 | |
17727 | 492 size_t ParallelScavengeHeap::tlab_used(Thread* thr) const { |
493 return young_gen()->eden_space()->tlab_used(thr); | |
494 } | |
495 | |
0 | 496 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
497 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
498 } | |
499 | |
500 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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501 return young_gen()->allocate(size); |
0 | 502 } |
503 | |
504 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
505 CollectedHeap::accumulate_statistics_all_tlabs(); | |
506 } | |
507 | |
508 void ParallelScavengeHeap::resize_all_tlabs() { | |
509 CollectedHeap::resize_all_tlabs(); | |
510 } | |
511 | |
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512 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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513 // We don't need barriers for stores to objects in the |
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514 // young gen and, a fortiori, for initializing stores to |
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515 // objects therein. |
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516 return is_in_young(new_obj); |
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517 } |
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518 |
0 | 519 // This method is used by System.gc() and JVMTI. |
520 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
521 assert(!Heap_lock->owned_by_self(), | |
522 "this thread should not own the Heap_lock"); | |
523 | |
524 unsigned int gc_count = 0; | |
525 unsigned int full_gc_count = 0; | |
526 { | |
527 MutexLocker ml(Heap_lock); | |
528 // This value is guarded by the Heap_lock | |
529 gc_count = Universe::heap()->total_collections(); | |
530 full_gc_count = Universe::heap()->total_full_collections(); | |
531 } | |
532 | |
533 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
534 VMThread::execute(&op); | |
535 } | |
536 | |
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537 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 538 Unimplemented(); |
539 } | |
540 | |
541 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
542 young_gen()->object_iterate(cl); | |
543 old_gen()->object_iterate(cl); | |
544 } | |
545 | |
546 | |
547 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
548 if (young_gen()->is_in_reserved(addr)) { | |
549 assert(young_gen()->is_in(addr), | |
550 "addr should be in allocated part of young gen"); | |
1907 | 551 // called from os::print_location by find or VMError |
552 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 553 Unimplemented(); |
554 } else if (old_gen()->is_in_reserved(addr)) { | |
555 assert(old_gen()->is_in(addr), | |
556 "addr should be in allocated part of old gen"); | |
557 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
558 } | |
559 return 0; | |
560 } | |
561 | |
562 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
563 return oop(addr)->size(); | |
564 } | |
565 | |
566 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
567 return block_start(addr) == addr; | |
568 } | |
569 | |
570 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
571 return UseParallelOldGC ? | |
572 PSParallelCompact::millis_since_last_gc() : | |
573 PSMarkSweep::millis_since_last_gc(); | |
574 } | |
575 | |
576 void ParallelScavengeHeap::prepare_for_verify() { | |
577 ensure_parsability(false); // no need to retire TLABs for verification | |
578 } | |
579 | |
10405 | 580 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() { |
581 PSOldGen* old = old_gen(); | |
582 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr(); | |
583 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end()); | |
584 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes()); | |
585 | |
586 PSYoungGen* young = young_gen(); | |
587 VirtualSpaceSummary young_summary(young->reserved().start(), | |
588 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end()); | |
589 | |
590 MutableSpace* eden = young_gen()->eden_space(); | |
591 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes()); | |
592 | |
593 MutableSpace* from = young_gen()->from_space(); | |
594 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes()); | |
595 | |
596 MutableSpace* to = young_gen()->to_space(); | |
597 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes()); | |
598 | |
599 VirtualSpaceSummary heap_summary = create_heap_space_summary(); | |
600 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space); | |
601 } | |
602 | |
0 | 603 void ParallelScavengeHeap::print_on(outputStream* st) const { |
604 young_gen()->print_on(st); | |
605 old_gen()->print_on(st); | |
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606 MetaspaceAux::print_on(st); |
0 | 607 } |
608 | |
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609 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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610 this->CollectedHeap::print_on_error(st); |
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611 |
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612 if (UseParallelOldGC) { |
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613 st->cr(); |
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614 PSParallelCompact::print_on_error(st); |
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615 } |
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616 } |
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617 |
0 | 618 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
619 PSScavenge::gc_task_manager()->threads_do(tc); | |
620 } | |
621 | |
622 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
623 PSScavenge::gc_task_manager()->print_threads_on(st); | |
624 } | |
625 | |
626 void ParallelScavengeHeap::print_tracing_info() const { | |
627 if (TraceGen0Time) { | |
628 double time = PSScavenge::accumulated_time()->seconds(); | |
629 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
630 } | |
631 if (TraceGen1Time) { | |
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632 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
0 | 633 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
634 } | |
635 } | |
636 | |
637 | |
6008 | 638 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 639 // Why do we need the total_collections()-filter below? |
640 if (total_collections() > 0) { | |
641 if (!silent) { | |
642 gclog_or_tty->print("tenured "); | |
643 } | |
6008 | 644 old_gen()->verify(); |
0 | 645 |
646 if (!silent) { | |
647 gclog_or_tty->print("eden "); | |
648 } | |
6008 | 649 young_gen()->verify(); |
0 | 650 } |
651 } | |
652 | |
653 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
654 if (PrintGCDetails && Verbose) { | |
655 gclog_or_tty->print(" " SIZE_FORMAT | |
656 "->" SIZE_FORMAT | |
657 "(" SIZE_FORMAT ")", | |
658 prev_used, used(), capacity()); | |
659 } else { | |
660 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
661 "->" SIZE_FORMAT "K" | |
662 "(" SIZE_FORMAT "K)", | |
663 prev_used / K, used() / K, capacity() / K); | |
664 } | |
665 } | |
666 | |
10405 | 667 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
668 const PSHeapSummary& heap_summary = create_ps_heap_summary(); | |
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669 gc_tracer->report_gc_heap_summary(when, heap_summary); |
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670 |
10405 | 671 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); |
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672 gc_tracer->report_metaspace_summary(when, metaspace_summary); |
10405 | 673 } |
674 | |
0 | 675 ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
676 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
677 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
678 return _psh; | |
679 } | |
680 | |
681 // Before delegating the resize to the young generation, | |
682 // the reserved space for the young and old generations | |
683 // may be changed to accomodate the desired resize. | |
684 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
685 size_t survivor_size) { | |
686 if (UseAdaptiveGCBoundary) { | |
687 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
688 size_policy()->reset_bytes_absorbed_from_eden(); | |
689 return; // The generation changed size already. | |
690 } | |
691 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
692 } | |
693 | |
694 // Delegate the resize to the generation. | |
695 _young_gen->resize(eden_size, survivor_size); | |
696 } | |
697 | |
698 // Before delegating the resize to the old generation, | |
699 // the reserved space for the young and old generations | |
700 // may be changed to accomodate the desired resize. | |
701 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
702 if (UseAdaptiveGCBoundary) { | |
703 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
704 size_policy()->reset_bytes_absorbed_from_eden(); | |
705 return; // The generation changed size already. | |
706 } | |
707 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
708 } | |
709 | |
710 // Delegate the resize to the generation. | |
711 _old_gen->resize(desired_free_space); | |
712 } | |
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713 |
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714 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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715 // nothing particular |
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716 } |
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717 |
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718 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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719 // nothing particular |
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720 } |
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721 |
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722 #ifndef PRODUCT |
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723 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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724 if (ZapUnusedHeapArea) { |
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725 young_gen()->record_spaces_top(); |
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726 old_gen()->record_spaces_top(); |
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727 } |
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728 } |
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729 |
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730 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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731 if (ZapUnusedHeapArea) { |
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732 young_gen()->eden_space()->mangle_unused_area(); |
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733 young_gen()->to_space()->mangle_unused_area(); |
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734 young_gen()->from_space()->mangle_unused_area(); |
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735 old_gen()->object_space()->mangle_unused_area(); |
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736 } |
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737 } |
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738 #endif |