Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
children | 7848fc12602b |
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); | |
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=" SIZE_FORMAT, 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 | |
17727 | 495 size_t ParallelScavengeHeap::tlab_used(Thread* thr) const { |
496 return young_gen()->eden_space()->tlab_used(thr); | |
497 } | |
498 | |
0 | 499 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
500 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
501 } | |
502 | |
503 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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504 return young_gen()->allocate(size); |
0 | 505 } |
506 | |
507 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
508 CollectedHeap::accumulate_statistics_all_tlabs(); | |
509 } | |
510 | |
511 void ParallelScavengeHeap::resize_all_tlabs() { | |
512 CollectedHeap::resize_all_tlabs(); | |
513 } | |
514 | |
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515 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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516 // We don't need barriers for stores to objects in the |
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517 // young gen and, a fortiori, for initializing stores to |
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518 // objects therein. |
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519 return is_in_young(new_obj); |
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520 } |
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521 |
0 | 522 // This method is used by System.gc() and JVMTI. |
523 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
524 assert(!Heap_lock->owned_by_self(), | |
525 "this thread should not own the Heap_lock"); | |
526 | |
527 unsigned int gc_count = 0; | |
528 unsigned int full_gc_count = 0; | |
529 { | |
530 MutexLocker ml(Heap_lock); | |
531 // This value is guarded by the Heap_lock | |
532 gc_count = Universe::heap()->total_collections(); | |
533 full_gc_count = Universe::heap()->total_full_collections(); | |
534 } | |
535 | |
536 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
537 VMThread::execute(&op); | |
538 } | |
539 | |
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540 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 541 Unimplemented(); |
542 } | |
543 | |
544 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
545 young_gen()->object_iterate(cl); | |
546 old_gen()->object_iterate(cl); | |
547 } | |
548 | |
549 | |
550 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
551 if (young_gen()->is_in_reserved(addr)) { | |
552 assert(young_gen()->is_in(addr), | |
553 "addr should be in allocated part of young gen"); | |
1907 | 554 // called from os::print_location by find or VMError |
555 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 556 Unimplemented(); |
557 } else if (old_gen()->is_in_reserved(addr)) { | |
558 assert(old_gen()->is_in(addr), | |
559 "addr should be in allocated part of old gen"); | |
560 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
561 } | |
562 return 0; | |
563 } | |
564 | |
565 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
566 return oop(addr)->size(); | |
567 } | |
568 | |
569 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
570 return block_start(addr) == addr; | |
571 } | |
572 | |
573 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
574 return UseParallelOldGC ? | |
575 PSParallelCompact::millis_since_last_gc() : | |
576 PSMarkSweep::millis_since_last_gc(); | |
577 } | |
578 | |
579 void ParallelScavengeHeap::prepare_for_verify() { | |
580 ensure_parsability(false); // no need to retire TLABs for verification | |
581 } | |
582 | |
10405 | 583 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() { |
584 PSOldGen* old = old_gen(); | |
585 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr(); | |
586 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end()); | |
587 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes()); | |
588 | |
589 PSYoungGen* young = young_gen(); | |
590 VirtualSpaceSummary young_summary(young->reserved().start(), | |
591 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end()); | |
592 | |
593 MutableSpace* eden = young_gen()->eden_space(); | |
594 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes()); | |
595 | |
596 MutableSpace* from = young_gen()->from_space(); | |
597 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes()); | |
598 | |
599 MutableSpace* to = young_gen()->to_space(); | |
600 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes()); | |
601 | |
602 VirtualSpaceSummary heap_summary = create_heap_space_summary(); | |
603 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space); | |
604 } | |
605 | |
0 | 606 void ParallelScavengeHeap::print_on(outputStream* st) const { |
607 young_gen()->print_on(st); | |
608 old_gen()->print_on(st); | |
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609 MetaspaceAux::print_on(st); |
0 | 610 } |
611 | |
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612 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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613 this->CollectedHeap::print_on_error(st); |
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614 |
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615 if (UseParallelOldGC) { |
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616 st->cr(); |
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617 PSParallelCompact::print_on_error(st); |
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618 } |
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619 } |
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620 |
0 | 621 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
622 PSScavenge::gc_task_manager()->threads_do(tc); | |
623 } | |
624 | |
625 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
626 PSScavenge::gc_task_manager()->print_threads_on(st); | |
627 } | |
628 | |
629 void ParallelScavengeHeap::print_tracing_info() const { | |
630 if (TraceGen0Time) { | |
631 double time = PSScavenge::accumulated_time()->seconds(); | |
632 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
633 } | |
634 if (TraceGen1Time) { | |
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635 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
0 | 636 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
637 } | |
638 } | |
639 | |
640 | |
6008 | 641 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 642 // Why do we need the total_collections()-filter below? |
643 if (total_collections() > 0) { | |
644 if (!silent) { | |
645 gclog_or_tty->print("tenured "); | |
646 } | |
6008 | 647 old_gen()->verify(); |
0 | 648 |
649 if (!silent) { | |
650 gclog_or_tty->print("eden "); | |
651 } | |
6008 | 652 young_gen()->verify(); |
0 | 653 } |
654 } | |
655 | |
656 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
657 if (PrintGCDetails && Verbose) { | |
658 gclog_or_tty->print(" " SIZE_FORMAT | |
659 "->" SIZE_FORMAT | |
660 "(" SIZE_FORMAT ")", | |
661 prev_used, used(), capacity()); | |
662 } else { | |
663 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
664 "->" SIZE_FORMAT "K" | |
665 "(" SIZE_FORMAT "K)", | |
666 prev_used / K, used() / K, capacity() / K); | |
667 } | |
668 } | |
669 | |
10405 | 670 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
671 const PSHeapSummary& heap_summary = create_ps_heap_summary(); | |
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672 gc_tracer->report_gc_heap_summary(when, heap_summary); |
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673 |
10405 | 674 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); |
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675 gc_tracer->report_metaspace_summary(when, metaspace_summary); |
10405 | 676 } |
677 | |
0 | 678 ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
679 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
680 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
681 return _psh; | |
682 } | |
683 | |
684 // Before delegating the resize to the young generation, | |
685 // the reserved space for the young and old generations | |
686 // may be changed to accomodate the desired resize. | |
687 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
688 size_t survivor_size) { | |
689 if (UseAdaptiveGCBoundary) { | |
690 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
691 size_policy()->reset_bytes_absorbed_from_eden(); | |
692 return; // The generation changed size already. | |
693 } | |
694 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
695 } | |
696 | |
697 // Delegate the resize to the generation. | |
698 _young_gen->resize(eden_size, survivor_size); | |
699 } | |
700 | |
701 // Before delegating the resize to the old generation, | |
702 // the reserved space for the young and old generations | |
703 // may be changed to accomodate the desired resize. | |
704 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
705 if (UseAdaptiveGCBoundary) { | |
706 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
707 size_policy()->reset_bytes_absorbed_from_eden(); | |
708 return; // The generation changed size already. | |
709 } | |
710 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
711 } | |
712 | |
713 // Delegate the resize to the generation. | |
714 _old_gen->resize(desired_free_space); | |
715 } | |
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716 |
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717 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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718 // nothing particular |
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719 } |
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720 |
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721 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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722 // nothing particular |
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723 } |
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724 |
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725 #ifndef PRODUCT |
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726 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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727 if (ZapUnusedHeapArea) { |
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728 young_gen()->record_spaces_top(); |
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729 old_gen()->record_spaces_top(); |
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730 } |
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731 } |
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732 |
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733 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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734 if (ZapUnusedHeapArea) { |
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735 young_gen()->eden_space()->mangle_unused_area(); |
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736 young_gen()->to_space()->mangle_unused_area(); |
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737 young_gen()->from_space()->mangle_unused_area(); |
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738 old_gen()->object_space()->mangle_unused_area(); |
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739 } |
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740 } |
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741 #endif |