Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 10179:a08c80e9e1e5
8012687: Remove unused is_root checks and closures
Reviewed-by: tschatzl, jmasa
author | stefank |
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date | Mon, 22 Apr 2013 20:27:36 +0200 |
parents | 7b835924c31c |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" | |
38 #include "memory/gcLocker.inline.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/handles.inline.hpp" | |
41 #include "runtime/java.hpp" | |
42 #include "runtime/vmThread.hpp" | |
6197 | 43 #include "services/memTracker.hpp" |
1972 | 44 #include "utilities/vmError.hpp" |
0 | 45 |
46 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
47 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
48 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
49 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
50 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
51 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
52 | |
53 static void trace_gen_sizes(const char* const str, | |
54 size_t og_min, size_t og_max, | |
55 size_t yg_min, size_t yg_max) | |
56 { | |
57 if (TracePageSizes) { | |
58 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
59 SIZE_FORMAT "," SIZE_FORMAT " " | |
60 SIZE_FORMAT, | |
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61 str, |
0 | 62 og_min / K, og_max / K, |
63 yg_min / K, yg_max / K, | |
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64 (og_max + yg_max) / K); |
0 | 65 } |
66 } | |
67 | |
68 jint ParallelScavengeHeap::initialize() { | |
1166 | 69 CollectedHeap::pre_initialize(); |
70 | |
0 | 71 // Cannot be initialized until after the flags are parsed |
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72 // GenerationSizer flag_parser; |
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73 _collector_policy = new GenerationSizer(); |
0 | 74 |
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75 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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76 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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77 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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78 size_t og_max_size = _collector_policy->max_old_gen_size(); |
0 | 79 |
80 trace_gen_sizes("ps heap raw", | |
81 og_min_size, og_max_size, | |
82 yg_min_size, yg_max_size); | |
83 | |
84 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
85 yg_max_size + og_max_size, | |
86 8); | |
87 | |
88 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
89 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
90 | |
91 // Update sizes to reflect the selected page size(s). | |
92 // | |
93 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
94 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
95 // move to the common code. | |
96 yg_min_size = align_size_up(yg_min_size, yg_align); | |
97 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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98 size_t yg_cur_size = |
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99 align_size_up(_collector_policy->young_gen_size(), yg_align); |
0 | 100 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
101 | |
102 og_min_size = align_size_up(og_min_size, og_align); | |
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103 // Align old gen size down to preserve specified heap size. |
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104 assert(og_align == yg_align, "sanity"); |
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105 og_max_size = align_size_down(og_max_size, og_align); |
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106 og_max_size = MAX2(og_max_size, og_min_size); |
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107 size_t og_cur_size = |
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108 align_size_down(_collector_policy->old_gen_size(), og_align); |
0 | 109 og_cur_size = MAX2(og_cur_size, og_min_size); |
110 | |
111 trace_gen_sizes("ps heap rnd", | |
112 og_min_size, og_max_size, | |
113 yg_min_size, yg_max_size); | |
114 | |
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115 const size_t heap_size = og_max_size + yg_max_size; |
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116 |
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117 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, og_align); |
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118 |
6197 | 119 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
120 | |
0 | 121 os::trace_page_sizes("ps main", og_min_size + yg_min_size, |
122 og_max_size + yg_max_size, og_page_sz, | |
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123 heap_rs.base(), |
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124 heap_rs.size()); |
0 | 125 if (!heap_rs.is_reserved()) { |
126 vm_shutdown_during_initialization( | |
127 "Could not reserve enough space for object heap"); | |
128 return JNI_ENOMEM; | |
129 } | |
130 | |
131 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
132 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
133 | |
134 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
135 _barrier_set = barrier_set; | |
136 oopDesc::set_bs(_barrier_set); | |
137 if (_barrier_set == NULL) { | |
138 vm_shutdown_during_initialization( | |
139 "Could not reserve enough space for barrier set"); | |
140 return JNI_ENOMEM; | |
141 } | |
142 | |
143 // Initial young gen size is 4 Mb | |
144 // | |
145 // XXX - what about flag_parser.young_gen_size()? | |
146 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
147 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
148 | |
149 // Make up the generations | |
150 // Calculate the maximum size that a generation can grow. This | |
151 // includes growth into the other generation. Note that the | |
152 // parameter _max_gen_size is kept as the maximum | |
153 // size of the generation as the boundaries currently stand. | |
154 // _max_gen_size is still used as that value. | |
155 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
156 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
157 | |
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158 _gens = new AdjoiningGenerations(heap_rs, |
0 | 159 og_cur_size, |
160 og_min_size, | |
161 og_max_size, | |
162 yg_cur_size, | |
163 yg_min_size, | |
164 yg_max_size, | |
165 yg_align); | |
166 | |
167 _old_gen = _gens->old_gen(); | |
168 _young_gen = _gens->young_gen(); | |
169 | |
170 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
171 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
172 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
173 _size_policy = | |
174 new PSAdaptiveSizePolicy(eden_capacity, | |
175 initial_promo_size, | |
176 young_gen()->to_space()->capacity_in_bytes(), | |
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177 intra_heap_alignment(), |
0 | 178 max_gc_pause_sec, |
179 max_gc_minor_pause_sec, | |
180 GCTimeRatio | |
181 ); | |
182 | |
183 assert(!UseAdaptiveGCBoundary || | |
184 (old_gen()->virtual_space()->high_boundary() == | |
185 young_gen()->virtual_space()->low_boundary()), | |
186 "Boundaries must meet"); | |
187 // initialize the policy counters - 2 collectors, 3 generations | |
188 _gc_policy_counters = | |
189 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
190 _psh = this; | |
191 | |
192 // Set up the GCTaskManager | |
193 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
194 | |
195 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
196 return JNI_ENOMEM; | |
197 } | |
198 | |
199 return JNI_OK; | |
200 } | |
201 | |
202 void ParallelScavengeHeap::post_initialize() { | |
203 // Need to init the tenuring threshold | |
204 PSScavenge::initialize(); | |
205 if (UseParallelOldGC) { | |
206 PSParallelCompact::post_initialize(); | |
207 } else { | |
208 PSMarkSweep::initialize(); | |
209 } | |
210 PSPromotionManager::initialize(); | |
211 } | |
212 | |
213 void ParallelScavengeHeap::update_counters() { | |
214 young_gen()->update_counters(); | |
215 old_gen()->update_counters(); | |
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216 MetaspaceCounters::update_performance_counters(); |
0 | 217 } |
218 | |
219 size_t ParallelScavengeHeap::capacity() const { | |
220 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
221 return value; | |
222 } | |
223 | |
224 size_t ParallelScavengeHeap::used() const { | |
225 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
226 return value; | |
227 } | |
228 | |
229 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
230 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
231 } | |
232 | |
233 | |
234 size_t ParallelScavengeHeap::max_capacity() const { | |
235 size_t estimated = reserved_region().byte_size(); | |
236 if (UseAdaptiveSizePolicy) { | |
237 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
238 } else { | |
239 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
240 } | |
241 return MAX2(estimated, capacity()); | |
242 } | |
243 | |
244 bool ParallelScavengeHeap::is_in(const void* p) const { | |
245 if (young_gen()->is_in(p)) { | |
246 return true; | |
247 } | |
248 | |
249 if (old_gen()->is_in(p)) { | |
250 return true; | |
251 } | |
252 | |
253 return false; | |
254 } | |
255 | |
256 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
257 if (young_gen()->is_in_reserved(p)) { | |
258 return true; | |
259 } | |
260 | |
261 if (old_gen()->is_in_reserved(p)) { | |
262 return true; | |
263 } | |
264 | |
265 return false; | |
266 } | |
267 | |
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268 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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269 return is_in_young((oop)addr); |
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270 } |
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271 |
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272 #ifdef ASSERT |
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273 // Don't implement this by using is_in_young(). This method is used |
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274 // in some cases to check that is_in_young() is correct. |
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275 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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276 assert(is_in_reserved(p) || p == NULL, |
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277 "Does not work if address is non-null and outside of the heap"); |
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278 // The order of the generations is old (low addr), young (high addr) |
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279 return p >= old_gen()->reserved().end(); |
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280 } |
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281 #endif |
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282 |
0 | 283 // There are two levels of allocation policy here. |
284 // | |
285 // When an allocation request fails, the requesting thread must invoke a VM | |
286 // operation, transfer control to the VM thread, and await the results of a | |
287 // garbage collection. That is quite expensive, and we should avoid doing it | |
288 // multiple times if possible. | |
289 // | |
290 // To accomplish this, we have a basic allocation policy, and also a | |
291 // failed allocation policy. | |
292 // | |
293 // The basic allocation policy controls how you allocate memory without | |
294 // attempting garbage collection. It is okay to grab locks and | |
295 // expand the heap, if that can be done without coming to a safepoint. | |
296 // It is likely that the basic allocation policy will not be very | |
297 // aggressive. | |
298 // | |
299 // The failed allocation policy is invoked from the VM thread after | |
300 // the basic allocation policy is unable to satisfy a mem_allocate | |
301 // request. This policy needs to cover the entire range of collection, | |
302 // heap expansion, and out-of-memory conditions. It should make every | |
303 // attempt to allocate the requested memory. | |
304 | |
305 // Basic allocation policy. Should never be called at a safepoint, or | |
306 // from the VM thread. | |
307 // | |
308 // This method must handle cases where many mem_allocate requests fail | |
309 // simultaneously. When that happens, only one VM operation will succeed, | |
310 // and the rest will not be executed. For that reason, this method loops | |
311 // during failed allocation attempts. If the java heap becomes exhausted, | |
312 // we rely on the size_policy object to force a bail out. | |
313 HeapWord* ParallelScavengeHeap::mem_allocate( | |
314 size_t size, | |
315 bool* gc_overhead_limit_was_exceeded) { | |
316 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
317 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
318 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
319 | |
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320 // In general gc_overhead_limit_was_exceeded should be false so |
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321 // set it so here and reset it to true only if the gc time |
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322 // limit is being exceeded as checked below. |
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323 *gc_overhead_limit_was_exceeded = false; |
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324 |
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325 HeapWord* result = young_gen()->allocate(size); |
0 | 326 |
327 uint loop_count = 0; | |
328 uint gc_count = 0; | |
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329 int gclocker_stalled_count = 0; |
0 | 330 |
331 while (result == NULL) { | |
332 // We don't want to have multiple collections for a single filled generation. | |
333 // To prevent this, each thread tracks the total_collections() value, and if | |
334 // the count has changed, does not do a new collection. | |
335 // | |
336 // The collection count must be read only while holding the heap lock. VM | |
337 // operations also hold the heap lock during collections. There is a lock | |
338 // contention case where thread A blocks waiting on the Heap_lock, while | |
339 // thread B is holding it doing a collection. When thread A gets the lock, | |
340 // the collection count has already changed. To prevent duplicate collections, | |
341 // The policy MUST attempt allocations during the same period it reads the | |
342 // total_collections() value! | |
343 { | |
344 MutexLocker ml(Heap_lock); | |
345 gc_count = Universe::heap()->total_collections(); | |
346 | |
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347 result = young_gen()->allocate(size); |
0 | 348 if (result != NULL) { |
349 return result; | |
350 } | |
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351 |
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352 // If certain conditions hold, try allocating from the old gen. |
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353 result = mem_allocate_old_gen(size); |
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354 if (result != NULL) { |
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355 return result; |
0 | 356 } |
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357 |
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358 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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359 return NULL; |
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360 } |
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361 |
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362 // Failed to allocate without a gc. |
0 | 363 if (GC_locker::is_active_and_needs_gc()) { |
364 // If this thread is not in a jni critical section, we stall | |
365 // the requestor until the critical section has cleared and | |
366 // GC allowed. When the critical section clears, a GC is | |
367 // initiated by the last thread exiting the critical section; so | |
368 // we retry the allocation sequence from the beginning of the loop, | |
369 // rather than causing more, now probably unnecessary, GC attempts. | |
370 JavaThread* jthr = JavaThread::current(); | |
371 if (!jthr->in_critical()) { | |
372 MutexUnlocker mul(Heap_lock); | |
373 GC_locker::stall_until_clear(); | |
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374 gclocker_stalled_count += 1; |
0 | 375 continue; |
376 } else { | |
377 if (CheckJNICalls) { | |
378 fatal("Possible deadlock due to allocating while" | |
379 " in jni critical section"); | |
380 } | |
381 return NULL; | |
382 } | |
383 } | |
384 } | |
385 | |
386 if (result == NULL) { | |
387 // Generate a VM operation | |
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388 VM_ParallelGCFailedAllocation op(size, gc_count); |
0 | 389 VMThread::execute(&op); |
390 | |
391 // Did the VM operation execute? If so, return the result directly. | |
392 // This prevents us from looping until time out on requests that can | |
393 // not be satisfied. | |
394 if (op.prologue_succeeded()) { | |
395 assert(Universe::heap()->is_in_or_null(op.result()), | |
396 "result not in heap"); | |
397 | |
398 // If GC was locked out during VM operation then retry allocation | |
399 // and/or stall as necessary. | |
400 if (op.gc_locked()) { | |
401 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
402 continue; // retry and/or stall as necessary | |
403 } | |
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404 |
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405 // Exit the loop if the gc time limit has been exceeded. |
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406 // The allocation must have failed above ("result" guarding |
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407 // this path is NULL) and the most recent collection has exceeded the |
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408 // gc overhead limit (although enough may have been collected to |
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409 // satisfy the allocation). Exit the loop so that an out-of-memory |
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410 // will be thrown (return a NULL ignoring the contents of |
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411 // op.result()), |
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412 // but clear gc_overhead_limit_exceeded so that the next collection |
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413 // starts with a clean slate (i.e., forgets about previous overhead |
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414 // excesses). Fill op.result() with a filler object so that the |
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415 // heap remains parsable. |
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416 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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417 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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418 |
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419 if (limit_exceeded && softrefs_clear) { |
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420 *gc_overhead_limit_was_exceeded = true; |
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421 size_policy()->set_gc_overhead_limit_exceeded(false); |
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422 if (PrintGCDetails && Verbose) { |
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423 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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424 "return NULL because gc_overhead_limit_exceeded is set"); |
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425 } |
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426 if (op.result() != NULL) { |
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427 CollectedHeap::fill_with_object(op.result(), size); |
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428 } |
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429 return NULL; |
0 | 430 } |
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431 |
0 | 432 return op.result(); |
433 } | |
434 } | |
435 | |
436 // The policy object will prevent us from looping forever. If the | |
437 // time spent in gc crosses a threshold, we will bail out. | |
438 loop_count++; | |
439 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
440 (loop_count % QueuedAllocationWarningCount == 0)) { | |
441 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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442 " size=%d", loop_count, size); |
0 | 443 } |
444 } | |
445 | |
446 return result; | |
447 } | |
448 | |
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449 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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450 // done before each allocation, and after the full gc the allocation still |
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451 // cannot be satisfied from the young gen. This routine detects that condition; |
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452 // it should be called after a full gc has been done and the allocation |
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453 // attempted from the young gen. The parameter 'addr' should be the result of |
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454 // that young gen allocation attempt. |
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455 void |
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456 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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457 if (addr != NULL) { |
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458 _death_march_count = 0; // death march has ended |
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459 } else if (_death_march_count == 0) { |
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460 if (should_alloc_in_eden(size)) { |
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461 _death_march_count = 1; // death march has started |
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462 } |
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463 } |
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464 } |
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465 |
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466 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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467 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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468 // Size is too big for eden, or gc is locked out. |
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469 return old_gen()->allocate(size); |
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470 } |
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471 |
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472 // If a "death march" is in progress, allocate from the old gen a limited |
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473 // number of times before doing a GC. |
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474 if (_death_march_count > 0) { |
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475 if (_death_march_count < 64) { |
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476 ++_death_march_count; |
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477 return old_gen()->allocate(size); |
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478 } else { |
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479 _death_march_count = 0; |
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480 } |
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481 } |
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482 return NULL; |
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483 } |
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484 |
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485 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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486 if (UseParallelOldGC) { |
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487 // The do_full_collection() parameter clear_all_soft_refs |
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488 // is interpreted here as maximum_compaction which will |
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489 // cause SoftRefs to be cleared. |
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490 bool maximum_compaction = clear_all_soft_refs; |
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491 PSParallelCompact::invoke(maximum_compaction); |
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492 } else { |
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493 PSMarkSweep::invoke(clear_all_soft_refs); |
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494 } |
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495 } |
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496 |
0 | 497 // Failed allocation policy. Must be called from the VM thread, and |
498 // only at a safepoint! Note that this method has policy for allocation | |
499 // flow, and NOT collection policy. So we do not check for gc collection | |
500 // time over limit here, that is the responsibility of the heap specific | |
501 // collection methods. This method decides where to attempt allocations, | |
502 // and when to attempt collections, but no collection specific policy. | |
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503 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
0 | 504 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
505 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
506 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
507 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
508 | |
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509 // We assume that allocation in eden will fail unless we collect. |
0 | 510 |
511 // First level allocation failure, scavenge and allocate in young gen. | |
512 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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513 const bool invoked_full_gc = PSScavenge::invoke(); |
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514 HeapWord* result = young_gen()->allocate(size); |
0 | 515 |
516 // Second level allocation failure. | |
517 // Mark sweep and allocate in young generation. | |
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518 if (result == NULL && !invoked_full_gc) { |
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519 do_full_collection(false); |
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520 result = young_gen()->allocate(size); |
0 | 521 } |
522 | |
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523 death_march_check(result, size); |
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524 |
0 | 525 // Third level allocation failure. |
526 // After mark sweep and young generation allocation failure, | |
527 // allocate in old generation. | |
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528 if (result == NULL) { |
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529 result = old_gen()->allocate(size); |
0 | 530 } |
531 | |
532 // Fourth level allocation failure. We're running out of memory. | |
533 // More complete mark sweep and allocate in young generation. | |
534 if (result == NULL) { | |
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535 do_full_collection(true); |
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536 result = young_gen()->allocate(size); |
0 | 537 } |
538 | |
539 // Fifth level allocation failure. | |
540 // After more complete mark sweep, allocate in old generation. | |
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541 if (result == NULL) { |
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542 result = old_gen()->allocate(size); |
0 | 543 } |
544 | |
545 return result; | |
546 } | |
547 | |
548 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
549 CollectedHeap::ensure_parsability(retire_tlabs); | |
550 young_gen()->eden_space()->ensure_parsability(); | |
551 } | |
552 | |
553 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
554 return young_gen()->eden_space()->free_in_bytes(); | |
555 } | |
556 | |
557 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
558 return young_gen()->eden_space()->tlab_capacity(thr); | |
559 } | |
560 | |
561 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
562 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
563 } | |
564 | |
565 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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566 return young_gen()->allocate(size); |
0 | 567 } |
568 | |
569 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
570 CollectedHeap::accumulate_statistics_all_tlabs(); | |
571 } | |
572 | |
573 void ParallelScavengeHeap::resize_all_tlabs() { | |
574 CollectedHeap::resize_all_tlabs(); | |
575 } | |
576 | |
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577 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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578 // We don't need barriers for stores to objects in the |
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579 // young gen and, a fortiori, for initializing stores to |
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580 // objects therein. |
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581 return is_in_young(new_obj); |
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582 } |
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583 |
0 | 584 // This method is used by System.gc() and JVMTI. |
585 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
586 assert(!Heap_lock->owned_by_self(), | |
587 "this thread should not own the Heap_lock"); | |
588 | |
589 unsigned int gc_count = 0; | |
590 unsigned int full_gc_count = 0; | |
591 { | |
592 MutexLocker ml(Heap_lock); | |
593 // This value is guarded by the Heap_lock | |
594 gc_count = Universe::heap()->total_collections(); | |
595 full_gc_count = Universe::heap()->total_full_collections(); | |
596 } | |
597 | |
598 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
599 VMThread::execute(&op); | |
600 } | |
601 | |
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602 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 603 Unimplemented(); |
604 } | |
605 | |
606 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
607 young_gen()->object_iterate(cl); | |
608 old_gen()->object_iterate(cl); | |
609 } | |
610 | |
611 | |
612 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
613 if (young_gen()->is_in_reserved(addr)) { | |
614 assert(young_gen()->is_in(addr), | |
615 "addr should be in allocated part of young gen"); | |
1907 | 616 // called from os::print_location by find or VMError |
617 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 618 Unimplemented(); |
619 } else if (old_gen()->is_in_reserved(addr)) { | |
620 assert(old_gen()->is_in(addr), | |
621 "addr should be in allocated part of old gen"); | |
622 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
623 } | |
624 return 0; | |
625 } | |
626 | |
627 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
628 return oop(addr)->size(); | |
629 } | |
630 | |
631 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
632 return block_start(addr) == addr; | |
633 } | |
634 | |
635 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
636 return UseParallelOldGC ? | |
637 PSParallelCompact::millis_since_last_gc() : | |
638 PSMarkSweep::millis_since_last_gc(); | |
639 } | |
640 | |
641 void ParallelScavengeHeap::prepare_for_verify() { | |
642 ensure_parsability(false); // no need to retire TLABs for verification | |
643 } | |
644 | |
645 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
646 young_gen()->print_on(st); | |
647 old_gen()->print_on(st); | |
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648 MetaspaceAux::print_on(st); |
0 | 649 } |
650 | |
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651 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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652 this->CollectedHeap::print_on_error(st); |
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653 |
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654 if (UseParallelOldGC) { |
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655 st->cr(); |
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656 PSParallelCompact::print_on_error(st); |
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657 } |
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658 } |
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659 |
0 | 660 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
661 PSScavenge::gc_task_manager()->threads_do(tc); | |
662 } | |
663 | |
664 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
665 PSScavenge::gc_task_manager()->print_threads_on(st); | |
666 } | |
667 | |
668 void ParallelScavengeHeap::print_tracing_info() const { | |
669 if (TraceGen0Time) { | |
670 double time = PSScavenge::accumulated_time()->seconds(); | |
671 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
672 } | |
673 if (TraceGen1Time) { | |
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674 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
0 | 675 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
676 } | |
677 } | |
678 | |
679 | |
6008 | 680 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 681 // Why do we need the total_collections()-filter below? |
682 if (total_collections() > 0) { | |
683 if (!silent) { | |
684 gclog_or_tty->print("tenured "); | |
685 } | |
6008 | 686 old_gen()->verify(); |
0 | 687 |
688 if (!silent) { | |
689 gclog_or_tty->print("eden "); | |
690 } | |
6008 | 691 young_gen()->verify(); |
0 | 692 } |
693 } | |
694 | |
695 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
696 if (PrintGCDetails && Verbose) { | |
697 gclog_or_tty->print(" " SIZE_FORMAT | |
698 "->" SIZE_FORMAT | |
699 "(" SIZE_FORMAT ")", | |
700 prev_used, used(), capacity()); | |
701 } else { | |
702 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
703 "->" SIZE_FORMAT "K" | |
704 "(" SIZE_FORMAT "K)", | |
705 prev_used / K, used() / K, capacity() / K); | |
706 } | |
707 } | |
708 | |
709 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
710 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
711 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
712 return _psh; | |
713 } | |
714 | |
715 // Before delegating the resize to the young generation, | |
716 // the reserved space for the young and old generations | |
717 // may be changed to accomodate the desired resize. | |
718 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
719 size_t survivor_size) { | |
720 if (UseAdaptiveGCBoundary) { | |
721 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
722 size_policy()->reset_bytes_absorbed_from_eden(); | |
723 return; // The generation changed size already. | |
724 } | |
725 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
726 } | |
727 | |
728 // Delegate the resize to the generation. | |
729 _young_gen->resize(eden_size, survivor_size); | |
730 } | |
731 | |
732 // Before delegating the resize to the old generation, | |
733 // the reserved space for the young and old generations | |
734 // may be changed to accomodate the desired resize. | |
735 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
736 if (UseAdaptiveGCBoundary) { | |
737 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
738 size_policy()->reset_bytes_absorbed_from_eden(); | |
739 return; // The generation changed size already. | |
740 } | |
741 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
742 } | |
743 | |
744 // Delegate the resize to the generation. | |
745 _old_gen->resize(desired_free_space); | |
746 } | |
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747 |
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748 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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749 // nothing particular |
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750 } |
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751 |
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752 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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753 // nothing particular |
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754 } |
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755 |
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756 #ifndef PRODUCT |
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757 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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758 if (ZapUnusedHeapArea) { |
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759 young_gen()->record_spaces_top(); |
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760 old_gen()->record_spaces_top(); |
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761 } |
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762 } |
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763 |
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764 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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765 if (ZapUnusedHeapArea) { |
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766 young_gen()->eden_space()->mangle_unused_area(); |
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767 young_gen()->to_space()->mangle_unused_area(); |
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768 young_gen()->from_space()->mangle_unused_area(); |
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769 old_gen()->object_space()->mangle_unused_area(); |
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770 } |
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771 } |
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772 #endif |