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annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 12054:bba234a1670e
grouped provider values/parameters into a Providers object (GRAAL-511)
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 11 Oct 2013 16:11:21 +0200 |
parents | f2110083203d |
children | 1a8fb39bdbc4 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/adjoiningGenerations.hpp" | |
27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
35 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" | |
36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
37 #include "gc_implementation/parallelScavenge/vmPSOperations.hpp" | |
10405 | 38 #include "gc_implementation/shared/gcHeapSummary.hpp" |
39 #include "gc_implementation/shared/gcWhen.hpp" | |
1972 | 40 #include "memory/gcLocker.inline.hpp" |
41 #include "oops/oop.inline.hpp" | |
42 #include "runtime/handles.inline.hpp" | |
43 #include "runtime/java.hpp" | |
44 #include "runtime/vmThread.hpp" | |
6197 | 45 #include "services/memTracker.hpp" |
1972 | 46 #include "utilities/vmError.hpp" |
0 | 47 |
48 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
49 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
50 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
51 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
52 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
53 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
54 | |
55 static void trace_gen_sizes(const char* const str, | |
56 size_t og_min, size_t og_max, | |
57 size_t yg_min, size_t yg_max) | |
58 { | |
59 if (TracePageSizes) { | |
60 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
61 SIZE_FORMAT "," SIZE_FORMAT " " | |
62 SIZE_FORMAT, | |
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63 str, |
0 | 64 og_min / K, og_max / K, |
65 yg_min / K, yg_max / K, | |
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66 (og_max + yg_max) / K); |
0 | 67 } |
68 } | |
69 | |
70 jint ParallelScavengeHeap::initialize() { | |
1166 | 71 CollectedHeap::pre_initialize(); |
72 | |
0 | 73 // Cannot be initialized until after the flags are parsed |
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74 // GenerationSizer flag_parser; |
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75 _collector_policy = new GenerationSizer(); |
0 | 76 |
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77 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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78 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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79 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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80 size_t og_max_size = _collector_policy->max_old_gen_size(); |
0 | 81 |
82 trace_gen_sizes("ps heap raw", | |
83 og_min_size, og_max_size, | |
84 yg_min_size, yg_max_size); | |
85 | |
86 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
87 yg_max_size + og_max_size, | |
88 8); | |
89 | |
90 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
91 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
92 | |
93 // Update sizes to reflect the selected page size(s). | |
94 // | |
95 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
96 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
97 // move to the common code. | |
98 yg_min_size = align_size_up(yg_min_size, yg_align); | |
99 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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100 size_t yg_cur_size = |
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101 align_size_up(_collector_policy->young_gen_size(), yg_align); |
0 | 102 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
103 | |
104 og_min_size = align_size_up(og_min_size, og_align); | |
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105 // Align old gen size down to preserve specified heap size. |
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106 assert(og_align == yg_align, "sanity"); |
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107 og_max_size = align_size_down(og_max_size, og_align); |
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108 og_max_size = MAX2(og_max_size, og_min_size); |
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109 size_t og_cur_size = |
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110 align_size_down(_collector_policy->old_gen_size(), og_align); |
0 | 111 og_cur_size = MAX2(og_cur_size, og_min_size); |
112 | |
113 trace_gen_sizes("ps heap rnd", | |
114 og_min_size, og_max_size, | |
115 yg_min_size, yg_max_size); | |
116 | |
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117 const size_t heap_size = og_max_size + yg_max_size; |
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118 |
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119 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, og_align); |
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120 |
6197 | 121 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
122 | |
0 | 123 os::trace_page_sizes("ps main", og_min_size + yg_min_size, |
124 og_max_size + yg_max_size, og_page_sz, | |
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125 heap_rs.base(), |
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126 heap_rs.size()); |
0 | 127 if (!heap_rs.is_reserved()) { |
128 vm_shutdown_during_initialization( | |
129 "Could not reserve enough space for object heap"); | |
130 return JNI_ENOMEM; | |
131 } | |
132 | |
133 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
134 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
135 | |
136 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
137 _barrier_set = barrier_set; | |
138 oopDesc::set_bs(_barrier_set); | |
139 if (_barrier_set == NULL) { | |
140 vm_shutdown_during_initialization( | |
141 "Could not reserve enough space for barrier set"); | |
142 return JNI_ENOMEM; | |
143 } | |
144 | |
145 // Initial young gen size is 4 Mb | |
146 // | |
147 // XXX - what about flag_parser.young_gen_size()? | |
148 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
149 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
150 | |
151 // Make up the generations | |
152 // Calculate the maximum size that a generation can grow. This | |
153 // includes growth into the other generation. Note that the | |
154 // parameter _max_gen_size is kept as the maximum | |
155 // size of the generation as the boundaries currently stand. | |
156 // _max_gen_size is still used as that value. | |
157 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
158 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
159 | |
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160 _gens = new AdjoiningGenerations(heap_rs, |
0 | 161 og_cur_size, |
162 og_min_size, | |
163 og_max_size, | |
164 yg_cur_size, | |
165 yg_min_size, | |
166 yg_max_size, | |
167 yg_align); | |
168 | |
169 _old_gen = _gens->old_gen(); | |
170 _young_gen = _gens->young_gen(); | |
171 | |
172 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
173 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
174 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
175 _size_policy = | |
176 new PSAdaptiveSizePolicy(eden_capacity, | |
177 initial_promo_size, | |
178 young_gen()->to_space()->capacity_in_bytes(), | |
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179 intra_heap_alignment(), |
0 | 180 max_gc_pause_sec, |
181 max_gc_minor_pause_sec, | |
182 GCTimeRatio | |
183 ); | |
184 | |
185 assert(!UseAdaptiveGCBoundary || | |
186 (old_gen()->virtual_space()->high_boundary() == | |
187 young_gen()->virtual_space()->low_boundary()), | |
188 "Boundaries must meet"); | |
189 // initialize the policy counters - 2 collectors, 3 generations | |
190 _gc_policy_counters = | |
191 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
192 _psh = this; | |
193 | |
194 // Set up the GCTaskManager | |
195 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
196 | |
197 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
198 return JNI_ENOMEM; | |
199 } | |
200 | |
201 return JNI_OK; | |
202 } | |
203 | |
204 void ParallelScavengeHeap::post_initialize() { | |
205 // Need to init the tenuring threshold | |
206 PSScavenge::initialize(); | |
207 if (UseParallelOldGC) { | |
208 PSParallelCompact::post_initialize(); | |
209 } else { | |
210 PSMarkSweep::initialize(); | |
211 } | |
212 PSPromotionManager::initialize(); | |
213 } | |
214 | |
215 void ParallelScavengeHeap::update_counters() { | |
216 young_gen()->update_counters(); | |
217 old_gen()->update_counters(); | |
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218 MetaspaceCounters::update_performance_counters(); |
0 | 219 } |
220 | |
221 size_t ParallelScavengeHeap::capacity() const { | |
222 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
223 return value; | |
224 } | |
225 | |
226 size_t ParallelScavengeHeap::used() const { | |
227 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
228 return value; | |
229 } | |
230 | |
231 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
232 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
233 } | |
234 | |
235 | |
236 size_t ParallelScavengeHeap::max_capacity() const { | |
237 size_t estimated = reserved_region().byte_size(); | |
238 if (UseAdaptiveSizePolicy) { | |
239 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
240 } else { | |
241 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
242 } | |
243 return MAX2(estimated, capacity()); | |
244 } | |
245 | |
246 bool ParallelScavengeHeap::is_in(const void* p) const { | |
247 if (young_gen()->is_in(p)) { | |
248 return true; | |
249 } | |
250 | |
251 if (old_gen()->is_in(p)) { | |
252 return true; | |
253 } | |
254 | |
255 return false; | |
256 } | |
257 | |
258 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
259 if (young_gen()->is_in_reserved(p)) { | |
260 return true; | |
261 } | |
262 | |
263 if (old_gen()->is_in_reserved(p)) { | |
264 return true; | |
265 } | |
266 | |
267 return false; | |
268 } | |
269 | |
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270 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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271 return is_in_young((oop)addr); |
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272 } |
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273 |
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274 #ifdef ASSERT |
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275 // Don't implement this by using is_in_young(). This method is used |
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276 // in some cases to check that is_in_young() is correct. |
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277 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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278 assert(is_in_reserved(p) || p == NULL, |
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279 "Does not work if address is non-null and outside of the heap"); |
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280 // The order of the generations is old (low addr), young (high addr) |
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281 return p >= old_gen()->reserved().end(); |
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282 } |
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283 #endif |
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284 |
0 | 285 // There are two levels of allocation policy here. |
286 // | |
287 // When an allocation request fails, the requesting thread must invoke a VM | |
288 // operation, transfer control to the VM thread, and await the results of a | |
289 // garbage collection. That is quite expensive, and we should avoid doing it | |
290 // multiple times if possible. | |
291 // | |
292 // To accomplish this, we have a basic allocation policy, and also a | |
293 // failed allocation policy. | |
294 // | |
295 // The basic allocation policy controls how you allocate memory without | |
296 // attempting garbage collection. It is okay to grab locks and | |
297 // expand the heap, if that can be done without coming to a safepoint. | |
298 // It is likely that the basic allocation policy will not be very | |
299 // aggressive. | |
300 // | |
301 // The failed allocation policy is invoked from the VM thread after | |
302 // the basic allocation policy is unable to satisfy a mem_allocate | |
303 // request. This policy needs to cover the entire range of collection, | |
304 // heap expansion, and out-of-memory conditions. It should make every | |
305 // attempt to allocate the requested memory. | |
306 | |
307 // Basic allocation policy. Should never be called at a safepoint, or | |
308 // from the VM thread. | |
309 // | |
310 // This method must handle cases where many mem_allocate requests fail | |
311 // simultaneously. When that happens, only one VM operation will succeed, | |
312 // and the rest will not be executed. For that reason, this method loops | |
313 // during failed allocation attempts. If the java heap becomes exhausted, | |
314 // we rely on the size_policy object to force a bail out. | |
315 HeapWord* ParallelScavengeHeap::mem_allocate( | |
316 size_t size, | |
317 bool* gc_overhead_limit_was_exceeded) { | |
318 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
319 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
320 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
321 | |
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322 // In general gc_overhead_limit_was_exceeded should be false so |
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323 // set it so here and reset it to true only if the gc time |
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324 // limit is being exceeded as checked below. |
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325 *gc_overhead_limit_was_exceeded = false; |
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326 |
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327 HeapWord* result = young_gen()->allocate(size); |
0 | 328 |
329 uint loop_count = 0; | |
330 uint gc_count = 0; | |
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331 int gclocker_stalled_count = 0; |
0 | 332 |
333 while (result == NULL) { | |
334 // We don't want to have multiple collections for a single filled generation. | |
335 // To prevent this, each thread tracks the total_collections() value, and if | |
336 // the count has changed, does not do a new collection. | |
337 // | |
338 // The collection count must be read only while holding the heap lock. VM | |
339 // operations also hold the heap lock during collections. There is a lock | |
340 // contention case where thread A blocks waiting on the Heap_lock, while | |
341 // thread B is holding it doing a collection. When thread A gets the lock, | |
342 // the collection count has already changed. To prevent duplicate collections, | |
343 // The policy MUST attempt allocations during the same period it reads the | |
344 // total_collections() value! | |
345 { | |
346 MutexLocker ml(Heap_lock); | |
347 gc_count = Universe::heap()->total_collections(); | |
348 | |
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349 result = young_gen()->allocate(size); |
0 | 350 if (result != NULL) { |
351 return result; | |
352 } | |
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353 |
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354 // If certain conditions hold, try allocating from the old gen. |
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355 result = mem_allocate_old_gen(size); |
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356 if (result != NULL) { |
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357 return result; |
0 | 358 } |
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359 |
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360 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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361 return NULL; |
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362 } |
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363 |
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364 // Failed to allocate without a gc. |
0 | 365 if (GC_locker::is_active_and_needs_gc()) { |
366 // If this thread is not in a jni critical section, we stall | |
367 // the requestor until the critical section has cleared and | |
368 // GC allowed. When the critical section clears, a GC is | |
369 // initiated by the last thread exiting the critical section; so | |
370 // we retry the allocation sequence from the beginning of the loop, | |
371 // rather than causing more, now probably unnecessary, GC attempts. | |
372 JavaThread* jthr = JavaThread::current(); | |
373 if (!jthr->in_critical()) { | |
374 MutexUnlocker mul(Heap_lock); | |
375 GC_locker::stall_until_clear(); | |
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376 gclocker_stalled_count += 1; |
0 | 377 continue; |
378 } else { | |
379 if (CheckJNICalls) { | |
380 fatal("Possible deadlock due to allocating while" | |
381 " in jni critical section"); | |
382 } | |
383 return NULL; | |
384 } | |
385 } | |
386 } | |
387 | |
388 if (result == NULL) { | |
389 // Generate a VM operation | |
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390 VM_ParallelGCFailedAllocation op(size, gc_count); |
0 | 391 VMThread::execute(&op); |
392 | |
393 // Did the VM operation execute? If so, return the result directly. | |
394 // This prevents us from looping until time out on requests that can | |
395 // not be satisfied. | |
396 if (op.prologue_succeeded()) { | |
397 assert(Universe::heap()->is_in_or_null(op.result()), | |
398 "result not in heap"); | |
399 | |
400 // If GC was locked out during VM operation then retry allocation | |
401 // and/or stall as necessary. | |
402 if (op.gc_locked()) { | |
403 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
404 continue; // retry and/or stall as necessary | |
405 } | |
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406 |
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407 // Exit the loop if the gc time limit has been exceeded. |
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408 // The allocation must have failed above ("result" guarding |
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409 // this path is NULL) and the most recent collection has exceeded the |
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410 // gc overhead limit (although enough may have been collected to |
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411 // satisfy the allocation). Exit the loop so that an out-of-memory |
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412 // will be thrown (return a NULL ignoring the contents of |
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413 // op.result()), |
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414 // but clear gc_overhead_limit_exceeded so that the next collection |
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415 // starts with a clean slate (i.e., forgets about previous overhead |
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416 // excesses). Fill op.result() with a filler object so that the |
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417 // heap remains parsable. |
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418 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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419 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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420 |
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421 if (limit_exceeded && softrefs_clear) { |
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422 *gc_overhead_limit_was_exceeded = true; |
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423 size_policy()->set_gc_overhead_limit_exceeded(false); |
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424 if (PrintGCDetails && Verbose) { |
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425 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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426 "return NULL because gc_overhead_limit_exceeded is set"); |
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427 } |
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428 if (op.result() != NULL) { |
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429 CollectedHeap::fill_with_object(op.result(), size); |
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430 } |
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431 return NULL; |
0 | 432 } |
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433 |
0 | 434 return op.result(); |
435 } | |
436 } | |
437 | |
438 // The policy object will prevent us from looping forever. If the | |
439 // time spent in gc crosses a threshold, we will bail out. | |
440 loop_count++; | |
441 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
442 (loop_count % QueuedAllocationWarningCount == 0)) { | |
443 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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444 " size=%d", loop_count, size); |
0 | 445 } |
446 } | |
447 | |
448 return result; | |
449 } | |
450 | |
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451 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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452 // done before each allocation, and after the full gc the allocation still |
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453 // cannot be satisfied from the young gen. This routine detects that condition; |
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454 // it should be called after a full gc has been done and the allocation |
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455 // attempted from the young gen. The parameter 'addr' should be the result of |
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456 // that young gen allocation attempt. |
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457 void |
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458 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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459 if (addr != NULL) { |
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460 _death_march_count = 0; // death march has ended |
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461 } else if (_death_march_count == 0) { |
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462 if (should_alloc_in_eden(size)) { |
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463 _death_march_count = 1; // death march has started |
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464 } |
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465 } |
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466 } |
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467 |
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468 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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469 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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470 // Size is too big for eden, or gc is locked out. |
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471 return old_gen()->allocate(size); |
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472 } |
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473 |
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474 // If a "death march" is in progress, allocate from the old gen a limited |
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475 // number of times before doing a GC. |
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476 if (_death_march_count > 0) { |
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477 if (_death_march_count < 64) { |
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478 ++_death_march_count; |
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479 return old_gen()->allocate(size); |
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480 } else { |
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481 _death_march_count = 0; |
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482 } |
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483 } |
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484 return NULL; |
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485 } |
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486 |
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487 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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488 if (UseParallelOldGC) { |
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489 // The do_full_collection() parameter clear_all_soft_refs |
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490 // is interpreted here as maximum_compaction which will |
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491 // cause SoftRefs to be cleared. |
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492 bool maximum_compaction = clear_all_soft_refs; |
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493 PSParallelCompact::invoke(maximum_compaction); |
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494 } else { |
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495 PSMarkSweep::invoke(clear_all_soft_refs); |
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496 } |
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497 } |
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498 |
0 | 499 // Failed allocation policy. Must be called from the VM thread, and |
500 // only at a safepoint! Note that this method has policy for allocation | |
501 // flow, and NOT collection policy. So we do not check for gc collection | |
502 // time over limit here, that is the responsibility of the heap specific | |
503 // collection methods. This method decides where to attempt allocations, | |
504 // and when to attempt collections, but no collection specific policy. | |
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505 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
0 | 506 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
507 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
508 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
509 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
510 | |
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511 // We assume that allocation in eden will fail unless we collect. |
0 | 512 |
513 // First level allocation failure, scavenge and allocate in young gen. | |
514 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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515 const bool invoked_full_gc = PSScavenge::invoke(); |
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516 HeapWord* result = young_gen()->allocate(size); |
0 | 517 |
518 // Second level allocation failure. | |
519 // Mark sweep and allocate in young generation. | |
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520 if (result == NULL && !invoked_full_gc) { |
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521 do_full_collection(false); |
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522 result = young_gen()->allocate(size); |
0 | 523 } |
524 | |
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525 death_march_check(result, size); |
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526 |
0 | 527 // Third level allocation failure. |
528 // After mark sweep and young generation allocation failure, | |
529 // allocate in old generation. | |
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530 if (result == NULL) { |
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531 result = old_gen()->allocate(size); |
0 | 532 } |
533 | |
534 // Fourth level allocation failure. We're running out of memory. | |
535 // More complete mark sweep and allocate in young generation. | |
536 if (result == NULL) { | |
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537 do_full_collection(true); |
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538 result = young_gen()->allocate(size); |
0 | 539 } |
540 | |
541 // Fifth level allocation failure. | |
542 // After more complete mark sweep, allocate in old generation. | |
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543 if (result == NULL) { |
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544 result = old_gen()->allocate(size); |
0 | 545 } |
546 | |
547 return result; | |
548 } | |
549 | |
550 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
551 CollectedHeap::ensure_parsability(retire_tlabs); | |
552 young_gen()->eden_space()->ensure_parsability(); | |
553 } | |
554 | |
555 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
556 return young_gen()->eden_space()->free_in_bytes(); | |
557 } | |
558 | |
559 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
560 return young_gen()->eden_space()->tlab_capacity(thr); | |
561 } | |
562 | |
563 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
564 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
565 } | |
566 | |
567 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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568 return young_gen()->allocate(size); |
0 | 569 } |
570 | |
571 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
572 CollectedHeap::accumulate_statistics_all_tlabs(); | |
573 } | |
574 | |
575 void ParallelScavengeHeap::resize_all_tlabs() { | |
576 CollectedHeap::resize_all_tlabs(); | |
577 } | |
578 | |
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579 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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580 // We don't need barriers for stores to objects in the |
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581 // young gen and, a fortiori, for initializing stores to |
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582 // objects therein. |
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583 return is_in_young(new_obj); |
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584 } |
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585 |
0 | 586 // This method is used by System.gc() and JVMTI. |
587 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
588 assert(!Heap_lock->owned_by_self(), | |
589 "this thread should not own the Heap_lock"); | |
590 | |
591 unsigned int gc_count = 0; | |
592 unsigned int full_gc_count = 0; | |
593 { | |
594 MutexLocker ml(Heap_lock); | |
595 // This value is guarded by the Heap_lock | |
596 gc_count = Universe::heap()->total_collections(); | |
597 full_gc_count = Universe::heap()->total_full_collections(); | |
598 } | |
599 | |
600 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
601 VMThread::execute(&op); | |
602 } | |
603 | |
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604 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 605 Unimplemented(); |
606 } | |
607 | |
608 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
609 young_gen()->object_iterate(cl); | |
610 old_gen()->object_iterate(cl); | |
611 } | |
612 | |
613 | |
614 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
615 if (young_gen()->is_in_reserved(addr)) { | |
616 assert(young_gen()->is_in(addr), | |
617 "addr should be in allocated part of young gen"); | |
1907 | 618 // called from os::print_location by find or VMError |
619 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 620 Unimplemented(); |
621 } else if (old_gen()->is_in_reserved(addr)) { | |
622 assert(old_gen()->is_in(addr), | |
623 "addr should be in allocated part of old gen"); | |
624 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
625 } | |
626 return 0; | |
627 } | |
628 | |
629 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
630 return oop(addr)->size(); | |
631 } | |
632 | |
633 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
634 return block_start(addr) == addr; | |
635 } | |
636 | |
637 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
638 return UseParallelOldGC ? | |
639 PSParallelCompact::millis_since_last_gc() : | |
640 PSMarkSweep::millis_since_last_gc(); | |
641 } | |
642 | |
643 void ParallelScavengeHeap::prepare_for_verify() { | |
644 ensure_parsability(false); // no need to retire TLABs for verification | |
645 } | |
646 | |
10405 | 647 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() { |
648 PSOldGen* old = old_gen(); | |
649 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr(); | |
650 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end()); | |
651 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes()); | |
652 | |
653 PSYoungGen* young = young_gen(); | |
654 VirtualSpaceSummary young_summary(young->reserved().start(), | |
655 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end()); | |
656 | |
657 MutableSpace* eden = young_gen()->eden_space(); | |
658 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes()); | |
659 | |
660 MutableSpace* from = young_gen()->from_space(); | |
661 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes()); | |
662 | |
663 MutableSpace* to = young_gen()->to_space(); | |
664 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes()); | |
665 | |
666 VirtualSpaceSummary heap_summary = create_heap_space_summary(); | |
667 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space); | |
668 } | |
669 | |
0 | 670 void ParallelScavengeHeap::print_on(outputStream* st) const { |
671 young_gen()->print_on(st); | |
672 old_gen()->print_on(st); | |
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673 MetaspaceAux::print_on(st); |
0 | 674 } |
675 | |
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676 void ParallelScavengeHeap::print_on_error(outputStream* st) const { |
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677 this->CollectedHeap::print_on_error(st); |
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678 |
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679 if (UseParallelOldGC) { |
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680 st->cr(); |
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681 PSParallelCompact::print_on_error(st); |
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682 } |
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683 } |
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684 |
0 | 685 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
686 PSScavenge::gc_task_manager()->threads_do(tc); | |
687 } | |
688 | |
689 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
690 PSScavenge::gc_task_manager()->print_threads_on(st); | |
691 } | |
692 | |
693 void ParallelScavengeHeap::print_tracing_info() const { | |
694 if (TraceGen0Time) { | |
695 double time = PSScavenge::accumulated_time()->seconds(); | |
696 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
697 } | |
698 if (TraceGen1Time) { | |
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699 double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds(); |
0 | 700 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
701 } | |
702 } | |
703 | |
704 | |
6008 | 705 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 706 // Why do we need the total_collections()-filter below? |
707 if (total_collections() > 0) { | |
708 if (!silent) { | |
709 gclog_or_tty->print("tenured "); | |
710 } | |
6008 | 711 old_gen()->verify(); |
0 | 712 |
713 if (!silent) { | |
714 gclog_or_tty->print("eden "); | |
715 } | |
6008 | 716 young_gen()->verify(); |
0 | 717 } |
718 } | |
719 | |
720 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
721 if (PrintGCDetails && Verbose) { | |
722 gclog_or_tty->print(" " SIZE_FORMAT | |
723 "->" SIZE_FORMAT | |
724 "(" SIZE_FORMAT ")", | |
725 prev_used, used(), capacity()); | |
726 } else { | |
727 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
728 "->" SIZE_FORMAT "K" | |
729 "(" SIZE_FORMAT "K)", | |
730 prev_used / K, used() / K, capacity() / K); | |
731 } | |
732 } | |
733 | |
10405 | 734 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
735 const PSHeapSummary& heap_summary = create_ps_heap_summary(); | |
736 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); | |
737 gc_tracer->report_gc_heap_summary(when, heap_summary, metaspace_summary); | |
738 } | |
739 | |
0 | 740 ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
741 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
742 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
743 return _psh; | |
744 } | |
745 | |
746 // Before delegating the resize to the young generation, | |
747 // the reserved space for the young and old generations | |
748 // may be changed to accomodate the desired resize. | |
749 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
750 size_t survivor_size) { | |
751 if (UseAdaptiveGCBoundary) { | |
752 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
753 size_policy()->reset_bytes_absorbed_from_eden(); | |
754 return; // The generation changed size already. | |
755 } | |
756 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
757 } | |
758 | |
759 // Delegate the resize to the generation. | |
760 _young_gen->resize(eden_size, survivor_size); | |
761 } | |
762 | |
763 // Before delegating the resize to the old generation, | |
764 // the reserved space for the young and old generations | |
765 // may be changed to accomodate the desired resize. | |
766 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
767 if (UseAdaptiveGCBoundary) { | |
768 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
769 size_policy()->reset_bytes_absorbed_from_eden(); | |
770 return; // The generation changed size already. | |
771 } | |
772 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
773 } | |
774 | |
775 // Delegate the resize to the generation. | |
776 _old_gen->resize(desired_free_space); | |
777 } | |
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778 |
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779 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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780 // nothing particular |
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781 } |
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782 |
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783 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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784 // nothing particular |
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785 } |
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786 |
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787 #ifndef PRODUCT |
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788 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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789 if (ZapUnusedHeapArea) { |
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790 young_gen()->record_spaces_top(); |
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791 old_gen()->record_spaces_top(); |
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792 } |
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793 } |
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794 |
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795 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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796 if (ZapUnusedHeapArea) { |
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797 young_gen()->eden_space()->mangle_unused_area(); |
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798 young_gen()->to_space()->mangle_unused_area(); |
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799 young_gen()->from_space()->mangle_unused_area(); |
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800 old_gen()->object_space()->mangle_unused_area(); |
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801 } |
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802 } |
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803 #endif |