Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 4059:44ce519bc3d1
7104960: JSR 292: +VerifyMethodHandles in product JVM can overflow buffer
Reviewed-by: kvn, jrose, twisti
author | never |
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date | Tue, 08 Nov 2011 10:31:53 -0800 |
parents | 4dfb2df418f2 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2011, 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" |
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26 #include "classfile/symbolTable.hpp" |
1972 | 27 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
28 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
29 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
31 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
32 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
33 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
34 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
35 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
36 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
37 #include "gc_implementation/shared/spaceDecorator.hpp" | |
38 #include "gc_interface/gcCause.hpp" | |
39 #include "memory/collectorPolicy.hpp" | |
40 #include "memory/gcLocker.inline.hpp" | |
41 #include "memory/referencePolicy.hpp" | |
42 #include "memory/referenceProcessor.hpp" | |
43 #include "memory/resourceArea.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.psgc.inline.hpp" | |
46 #include "runtime/biasedLocking.hpp" | |
47 #include "runtime/fprofiler.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/threadCritical.hpp" | |
50 #include "runtime/vmThread.hpp" | |
51 #include "runtime/vm_operations.hpp" | |
52 #include "services/memoryService.hpp" | |
53 #include "utilities/stack.inline.hpp" | |
0 | 54 |
55 | |
56 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
57 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
58 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
59 CardTableExtension* PSScavenge::_card_table = NULL; | |
60 bool PSScavenge::_survivor_overflow = false; | |
61 int PSScavenge::_tenuring_threshold = 0; | |
62 HeapWord* PSScavenge::_young_generation_boundary = NULL; | |
63 elapsedTimer PSScavenge::_accumulated_time; | |
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64 Stack<markOop> PSScavenge::_preserved_mark_stack; |
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65 Stack<oop> PSScavenge::_preserved_oop_stack; |
0 | 66 CollectorCounters* PSScavenge::_counters = NULL; |
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67 bool PSScavenge::_promotion_failed = false; |
0 | 68 |
69 // Define before use | |
70 class PSIsAliveClosure: public BoolObjectClosure { | |
71 public: | |
72 void do_object(oop p) { | |
73 assert(false, "Do not call."); | |
74 } | |
75 bool do_object_b(oop p) { | |
76 return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded(); | |
77 } | |
78 }; | |
79 | |
80 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
81 | |
82 class PSKeepAliveClosure: public OopClosure { | |
83 protected: | |
84 MutableSpace* _to_space; | |
85 PSPromotionManager* _promotion_manager; | |
86 | |
87 public: | |
88 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
89 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
90 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
91 _to_space = heap->young_gen()->to_space(); | |
92 | |
93 assert(_promotion_manager != NULL, "Sanity"); | |
94 } | |
95 | |
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96 template <class T> void do_oop_work(T* p) { |
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97 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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98 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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99 "expected an oop while scanning weak refs"); |
0 | 100 |
101 // Weak refs may be visited more than once. | |
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102 if (PSScavenge::should_scavenge(p, _to_space)) { |
0 | 103 PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p); |
104 } | |
105 } | |
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106 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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107 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 108 }; |
109 | |
110 class PSEvacuateFollowersClosure: public VoidClosure { | |
111 private: | |
112 PSPromotionManager* _promotion_manager; | |
113 public: | |
114 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
115 | |
113
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116 virtual void do_void() { |
0 | 117 assert(_promotion_manager != NULL, "Sanity"); |
118 _promotion_manager->drain_stacks(true); | |
119 guarantee(_promotion_manager->stacks_empty(), | |
120 "stacks should be empty at this point"); | |
121 } | |
122 }; | |
123 | |
124 class PSPromotionFailedClosure : public ObjectClosure { | |
125 virtual void do_object(oop obj) { | |
126 if (obj->is_forwarded()) { | |
127 obj->init_mark(); | |
128 } | |
129 } | |
130 }; | |
131 | |
132 class PSRefProcTaskProxy: public GCTask { | |
133 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
134 ProcessTask & _rp_task; | |
135 uint _work_id; | |
136 public: | |
137 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
138 : _rp_task(rp_task), | |
139 _work_id(work_id) | |
140 { } | |
141 | |
142 private: | |
143 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
144 virtual void do_it(GCTaskManager* manager, uint which); | |
145 }; | |
146 | |
147 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
148 { | |
149 PSPromotionManager* promotion_manager = | |
150 PSPromotionManager::gc_thread_promotion_manager(which); | |
151 assert(promotion_manager != NULL, "sanity check"); | |
152 PSKeepAliveClosure keep_alive(promotion_manager); | |
153 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
154 PSIsAliveClosure is_alive; | |
155 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
156 } | |
157 | |
158 class PSRefEnqueueTaskProxy: public GCTask { | |
159 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
160 EnqueueTask& _enq_task; | |
161 uint _work_id; | |
162 | |
163 public: | |
164 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
165 : _enq_task(enq_task), | |
166 _work_id(work_id) | |
167 { } | |
168 | |
169 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
170 virtual void do_it(GCTaskManager* manager, uint which) | |
171 { | |
172 _enq_task.work(_work_id); | |
173 } | |
174 }; | |
175 | |
176 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
177 virtual void execute(ProcessTask& task); | |
178 virtual void execute(EnqueueTask& task); | |
179 }; | |
180 | |
181 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
182 { | |
183 GCTaskQueue* q = GCTaskQueue::create(); | |
184 for(uint i=0; i<ParallelGCThreads; i++) { | |
185 q->enqueue(new PSRefProcTaskProxy(task, i)); | |
186 } | |
187 ParallelTaskTerminator terminator( | |
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188 ParallelScavengeHeap::gc_task_manager()->workers(), |
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189 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
0 | 190 if (task.marks_oops_alive() && ParallelGCThreads > 1) { |
191 for (uint j=0; j<ParallelGCThreads; j++) { | |
192 q->enqueue(new StealTask(&terminator)); | |
193 } | |
194 } | |
195 ParallelScavengeHeap::gc_task_manager()->execute_and_wait(q); | |
196 } | |
197 | |
198 | |
199 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
200 { | |
201 GCTaskQueue* q = GCTaskQueue::create(); | |
202 for(uint i=0; i<ParallelGCThreads; i++) { | |
203 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); | |
204 } | |
205 ParallelScavengeHeap::gc_task_manager()->execute_and_wait(q); | |
206 } | |
207 | |
208 // This method contains all heap specific policy for invoking scavenge. | |
209 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
210 // scavenge. It will not clean up after failed promotions, bail out if | |
211 // we've exceeded policy time limits, or any other special behavior. | |
212 // All such policy should be placed here. | |
213 // | |
214 // Note that this method should only be called from the vm_thread while | |
215 // at a safepoint! | |
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216 void PSScavenge::invoke() { |
0 | 217 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
218 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
219 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
220 | |
221 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
222 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
223 | |
224 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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225 IsGCActiveMark mark; |
0 | 226 |
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227 bool scavenge_was_done = PSScavenge::invoke_no_policy(); |
0 | 228 |
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229 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); |
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230 if (UsePerfData) |
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231 counters->update_full_follows_scavenge(0); |
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232 if (!scavenge_was_done || |
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233 policy->should_full_GC(heap->old_gen()->free_in_bytes())) { |
0 | 234 if (UsePerfData) |
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235 counters->update_full_follows_scavenge(full_follows_scavenge); |
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236 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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237 CollectorPolicy* cp = heap->collector_policy(); |
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238 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 239 |
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240 if (UseParallelOldGC) { |
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241 PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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242 } else { |
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243 PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 244 } |
245 } | |
246 } | |
247 | |
248 // This method contains no policy. You should probably | |
249 // be calling invoke() instead. | |
250 bool PSScavenge::invoke_no_policy() { | |
251 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
252 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
253 | |
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254 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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255 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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256 |
0 | 257 TimeStamp scavenge_entry; |
258 TimeStamp scavenge_midpoint; | |
259 TimeStamp scavenge_exit; | |
260 | |
261 scavenge_entry.update(); | |
262 | |
263 if (GC_locker::check_active_before_gc()) { | |
264 return false; | |
265 } | |
266 | |
267 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
268 GCCause::Cause gc_cause = heap->gc_cause(); | |
269 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
270 | |
271 // Check for potential problems. | |
272 if (!should_attempt_scavenge()) { | |
273 return false; | |
274 } | |
275 | |
276 bool promotion_failure_occurred = false; | |
277 | |
278 PSYoungGen* young_gen = heap->young_gen(); | |
279 PSOldGen* old_gen = heap->old_gen(); | |
280 PSPermGen* perm_gen = heap->perm_gen(); | |
281 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
282 heap->increment_total_collections(); | |
283 | |
284 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
285 | |
286 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
287 UseAdaptiveSizePolicyWithSystemGC) { | |
288 // Gather the feedback data for eden occupancy. | |
289 young_gen->eden_space()->accumulate_statistics(); | |
290 } | |
291 | |
263
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292 if (ZapUnusedHeapArea) { |
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293 // Save information needed to minimize mangling |
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294 heap->record_gen_tops_before_GC(); |
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295 } |
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296 |
0 | 297 if (PrintHeapAtGC) { |
298 Universe::print_heap_before_gc(); | |
299 } | |
300 | |
301 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
302 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
303 | |
304 size_t prev_used = heap->used(); | |
305 assert(promotion_failed() == false, "Sanity"); | |
306 | |
307 // Fill in TLABs | |
308 heap->accumulate_statistics_all_tlabs(); | |
309 heap->ensure_parsability(true); // retire TLABs | |
310 | |
311 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
312 HandleMark hm; // Discard invalid handles created during verification | |
313 gclog_or_tty->print(" VerifyBeforeGC:"); | |
314 Universe::verify(true); | |
315 } | |
316 | |
317 { | |
318 ResourceMark rm; | |
319 HandleMark hm; | |
320 | |
321 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
322 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
323 TraceTime t1("GC", PrintGC, !PrintGCDetails, gclog_or_tty); | |
324 TraceCollectorStats tcs(counters()); | |
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325 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 326 |
327 if (TraceGen0Time) accumulated_time()->start(); | |
328 | |
329 // Let the size policy know we're starting | |
330 size_policy->minor_collection_begin(); | |
331 | |
332 // Verify the object start arrays. | |
333 if (VerifyObjectStartArray && | |
334 VerifyBeforeGC) { | |
335 old_gen->verify_object_start_array(); | |
336 perm_gen->verify_object_start_array(); | |
337 } | |
338 | |
339 // Verify no unmarked old->young roots | |
340 if (VerifyRememberedSets) { | |
341 CardTableExtension::verify_all_young_refs_imprecise(); | |
342 } | |
343 | |
344 if (!ScavengeWithObjectsInToSpace) { | |
345 assert(young_gen->to_space()->is_empty(), | |
346 "Attempt to scavenge with live objects in to_space"); | |
263
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347 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 348 } else if (ZapUnusedHeapArea) { |
349 young_gen->to_space()->mangle_unused_area(); | |
350 } | |
351 save_to_space_top_before_gc(); | |
352 | |
353 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
354 | |
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355 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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356 reference_processor()->setup_policy(false); |
0 | 357 |
358 // We track how much was promoted to the next generation for | |
359 // the AdaptiveSizePolicy. | |
360 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
361 | |
362 // For PrintGCDetails | |
363 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
364 | |
365 // Reset our survivor overflow. | |
366 set_survivor_overflow(false); | |
367 | |
368 // We need to save the old/perm top values before | |
369 // creating the promotion_manager. We pass the top | |
370 // values to the card_table, to prevent it from | |
371 // straying into the promotion labs. | |
372 HeapWord* old_top = old_gen->object_space()->top(); | |
373 HeapWord* perm_top = perm_gen->object_space()->top(); | |
374 | |
375 // Release all previously held resources | |
376 gc_task_manager()->release_all_resources(); | |
377 | |
378 PSPromotionManager::pre_scavenge(); | |
379 | |
380 // We'll use the promotion manager again later. | |
381 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
382 { | |
383 // TraceTime("Roots"); | |
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384 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 385 |
386 GCTaskQueue* q = GCTaskQueue::create(); | |
387 | |
388 for(uint i=0; i<ParallelGCThreads; i++) { | |
389 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i)); | |
390 } | |
391 | |
392 q->enqueue(new SerialOldToYoungRootsTask(perm_gen, perm_top)); | |
393 | |
394 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
395 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
396 // We scan the thread roots in parallel | |
397 Threads::create_thread_roots_tasks(q); | |
398 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
399 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
400 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
401 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
402 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); | |
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403 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 404 |
405 ParallelTaskTerminator terminator( | |
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406 gc_task_manager()->workers(), |
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407 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
0 | 408 if (ParallelGCThreads>1) { |
409 for (uint j=0; j<ParallelGCThreads; j++) { | |
410 q->enqueue(new StealTask(&terminator)); | |
411 } | |
412 } | |
413 | |
414 gc_task_manager()->execute_and_wait(q); | |
415 } | |
416 | |
417 scavenge_midpoint.update(); | |
418 | |
419 // Process reference objects discovered during scavenge | |
420 { | |
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421 reference_processor()->setup_policy(false); // not always_clear |
0 | 422 PSKeepAliveClosure keep_alive(promotion_manager); |
423 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
424 if (reference_processor()->processing_is_mt()) { | |
425 PSRefProcTaskExecutor task_executor; | |
426 reference_processor()->process_discovered_references( | |
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427 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
0 | 428 } else { |
429 reference_processor()->process_discovered_references( | |
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430 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
0 | 431 } |
432 } | |
433 | |
434 // Enqueue reference objects discovered during scavenge. | |
435 if (reference_processor()->processing_is_mt()) { | |
436 PSRefProcTaskExecutor task_executor; | |
437 reference_processor()->enqueue_discovered_references(&task_executor); | |
438 } else { | |
439 reference_processor()->enqueue_discovered_references(NULL); | |
440 } | |
441 | |
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442 if (!JavaObjectsInPerm) { |
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443 // Unlink any dead interned Strings |
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444 StringTable::unlink(&_is_alive_closure); |
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445 // Process the remaining live ones |
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446 PSScavengeRootsClosure root_closure(promotion_manager); |
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447 StringTable::oops_do(&root_closure); |
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448 } |
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449 |
0 | 450 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
451 PSPromotionManager::post_scavenge(); | |
452 | |
453 promotion_failure_occurred = promotion_failed(); | |
454 if (promotion_failure_occurred) { | |
455 clean_up_failed_promotion(); | |
456 if (PrintGC) { | |
457 gclog_or_tty->print("--"); | |
458 } | |
459 } | |
460 | |
461 // Let the size policy know we're done. Note that we count promotion | |
462 // failure cleanup time as part of the collection (otherwise, we're | |
463 // implicitly saying it's mutator time). | |
464 size_policy->minor_collection_end(gc_cause); | |
465 | |
466 if (!promotion_failure_occurred) { | |
467 // Swap the survivor spaces. | |
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468 |
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469 |
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470 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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471 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 472 young_gen->swap_spaces(); |
473 | |
474 size_t survived = young_gen->from_space()->used_in_bytes(); | |
475 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
476 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
477 | |
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478 // A successful scavenge should restart the GC time limit count which is |
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479 // for full GC's. |
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480 size_policy->reset_gc_overhead_limit_count(); |
0 | 481 if (UseAdaptiveSizePolicy) { |
482 // Calculate the new survivor size and tenuring threshold | |
483 | |
484 if (PrintAdaptiveSizePolicy) { | |
485 gclog_or_tty->print("AdaptiveSizeStart: "); | |
486 gclog_or_tty->stamp(); | |
487 gclog_or_tty->print_cr(" collection: %d ", | |
488 heap->total_collections()); | |
489 | |
490 if (Verbose) { | |
491 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
492 " perm_gen_capacity: %d ", | |
493 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
494 perm_gen->capacity_in_bytes()); | |
495 } | |
496 } | |
497 | |
498 | |
499 if (UsePerfData) { | |
500 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
501 counters->update_old_eden_size( | |
502 size_policy->calculated_eden_size_in_bytes()); | |
503 counters->update_old_promo_size( | |
504 size_policy->calculated_promo_size_in_bytes()); | |
505 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
506 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
507 counters->update_survived(survived); | |
508 counters->update_promoted(promoted); | |
509 counters->update_survivor_overflowed(_survivor_overflow); | |
510 } | |
511 | |
512 size_t survivor_limit = | |
513 size_policy->max_survivor_size(young_gen->max_size()); | |
514 _tenuring_threshold = | |
515 size_policy->compute_survivor_space_size_and_threshold( | |
516 _survivor_overflow, | |
517 _tenuring_threshold, | |
518 survivor_limit); | |
519 | |
520 if (PrintTenuringDistribution) { | |
521 gclog_or_tty->cr(); | |
522 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)", | |
523 size_policy->calculated_survivor_size_in_bytes(), | |
524 _tenuring_threshold, MaxTenuringThreshold); | |
525 } | |
526 | |
527 if (UsePerfData) { | |
528 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
529 counters->update_tenuring_threshold(_tenuring_threshold); | |
530 counters->update_survivor_size_counters(); | |
531 } | |
532 | |
533 // Do call at minor collections? | |
534 // Don't check if the size_policy is ready at this | |
535 // level. Let the size_policy check that internally. | |
536 if (UseAdaptiveSizePolicy && | |
537 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
538 ((gc_cause != GCCause::_java_lang_system_gc) || | |
539 UseAdaptiveSizePolicyWithSystemGC)) { | |
540 | |
541 // Calculate optimial free space amounts | |
542 assert(young_gen->max_size() > | |
543 young_gen->from_space()->capacity_in_bytes() + | |
544 young_gen->to_space()->capacity_in_bytes(), | |
545 "Sizes of space in young gen are out-of-bounds"); | |
546 size_t max_eden_size = young_gen->max_size() - | |
547 young_gen->from_space()->capacity_in_bytes() - | |
548 young_gen->to_space()->capacity_in_bytes(); | |
549 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
550 young_gen->eden_space()->used_in_bytes(), | |
551 old_gen->used_in_bytes(), | |
552 perm_gen->used_in_bytes(), | |
553 young_gen->eden_space()->capacity_in_bytes(), | |
554 old_gen->max_gen_size(), | |
555 max_eden_size, | |
556 false /* full gc*/, | |
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557 gc_cause, |
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558 heap->collector_policy()); |
0 | 559 |
560 } | |
561 // Resize the young generation at every collection | |
562 // even if new sizes have not been calculated. This is | |
563 // to allow resizes that may have been inhibited by the | |
564 // relative location of the "to" and "from" spaces. | |
565 | |
566 // Resizing the old gen at minor collects can cause increases | |
567 // that don't feed back to the generation sizing policy until | |
568 // a major collection. Don't resize the old gen here. | |
569 | |
570 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
571 size_policy->calculated_survivor_size_in_bytes()); | |
572 | |
573 if (PrintAdaptiveSizePolicy) { | |
574 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
575 heap->total_collections()); | |
576 } | |
577 } | |
578 | |
579 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
580 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
581 // Also update() will case adaptive NUMA chunk resizing. | |
582 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
583 young_gen->eden_space()->update(); | |
584 | |
585 heap->gc_policy_counters()->update_counters(); | |
586 | |
587 heap->resize_all_tlabs(); | |
588 | |
589 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
590 } | |
591 | |
592 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
593 | |
594 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
595 | |
596 // Re-verify object start arrays | |
597 if (VerifyObjectStartArray && | |
598 VerifyAfterGC) { | |
599 old_gen->verify_object_start_array(); | |
600 perm_gen->verify_object_start_array(); | |
601 } | |
602 | |
603 // Verify all old -> young cards are now precise | |
604 if (VerifyRememberedSets) { | |
605 // Precise verification will give false positives. Until this is fixed, | |
606 // use imprecise verification. | |
607 // CardTableExtension::verify_all_young_refs_precise(); | |
608 CardTableExtension::verify_all_young_refs_imprecise(); | |
609 } | |
610 | |
611 if (TraceGen0Time) accumulated_time()->stop(); | |
612 | |
613 if (PrintGC) { | |
614 if (PrintGCDetails) { | |
615 // Don't print a GC timestamp here. This is after the GC so | |
616 // would be confusing. | |
617 young_gen->print_used_change(young_gen_used_before); | |
618 } | |
619 heap->print_heap_change(prev_used); | |
620 } | |
621 | |
622 // Track memory usage and detect low memory | |
623 MemoryService::track_memory_usage(); | |
624 heap->update_counters(); | |
625 } | |
626 | |
627 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
628 HandleMark hm; // Discard invalid handles created during verification | |
629 gclog_or_tty->print(" VerifyAfterGC:"); | |
630 Universe::verify(false); | |
631 } | |
632 | |
633 if (PrintHeapAtGC) { | |
634 Universe::print_heap_after_gc(); | |
635 } | |
636 | |
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637 if (ZapUnusedHeapArea) { |
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638 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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639 young_gen->from_space()->check_mangled_unused_area_complete(); |
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640 young_gen->to_space()->check_mangled_unused_area_complete(); |
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641 } |
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642 |
0 | 643 scavenge_exit.update(); |
644 | |
645 if (PrintGCTaskTimeStamps) { | |
646 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
647 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
648 scavenge_exit.ticks()); | |
649 gc_task_manager()->print_task_time_stamps(); | |
650 } | |
651 | |
546
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652 #ifdef TRACESPINNING |
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653 ParallelTaskTerminator::print_termination_counts(); |
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654 #endif |
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655 |
0 | 656 return !promotion_failure_occurred; |
657 } | |
658 | |
659 // This method iterates over all objects in the young generation, | |
660 // unforwarding markOops. It then restores any preserved mark oops, | |
661 // and clears the _preserved_mark_stack. | |
662 void PSScavenge::clean_up_failed_promotion() { | |
663 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
664 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
665 assert(promotion_failed(), "Sanity"); | |
666 | |
667 PSYoungGen* young_gen = heap->young_gen(); | |
668 | |
669 { | |
670 ResourceMark rm; | |
671 | |
672 // Unforward all pointers in the young gen. | |
673 PSPromotionFailedClosure unforward_closure; | |
674 young_gen->object_iterate(&unforward_closure); | |
675 | |
676 if (PrintGC && Verbose) { | |
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677 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 678 } |
679 | |
680 // Restore any saved marks. | |
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681 while (!_preserved_oop_stack.is_empty()) { |
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682 oop obj = _preserved_oop_stack.pop(); |
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683 markOop mark = _preserved_mark_stack.pop(); |
0 | 684 obj->set_mark(mark); |
685 } | |
686 | |
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687 // Clear the preserved mark and oop stack caches. |
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688 _preserved_mark_stack.clear(true); |
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689 _preserved_oop_stack.clear(true); |
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690 _promotion_failed = false; |
0 | 691 } |
692 | |
693 // Reset the PromotionFailureALot counters. | |
694 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
695 } | |
696 | |
697 // This method is called whenever an attempt to promote an object | |
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698 // fails. Some markOops will need preservation, some will not. Note |
0 | 699 // that the entire eden is traversed after a failed promotion, with |
700 // all forwarded headers replaced by the default markOop. This means | |
701 // it is not neccessary to preserve most markOops. | |
702 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
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703 _promotion_failed = true; |
0 | 704 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
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705 // Should use per-worker private stakcs hetre rather than |
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706 // locking a common pair of stacks. |
0 | 707 ThreadCritical tc; |
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708 _preserved_oop_stack.push(obj); |
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709 _preserved_mark_stack.push(obj_mark); |
0 | 710 } |
711 } | |
712 | |
713 bool PSScavenge::should_attempt_scavenge() { | |
714 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
715 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
716 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
717 | |
718 if (UsePerfData) { | |
719 counters->update_scavenge_skipped(not_skipped); | |
720 } | |
721 | |
722 PSYoungGen* young_gen = heap->young_gen(); | |
723 PSOldGen* old_gen = heap->old_gen(); | |
724 | |
725 if (!ScavengeWithObjectsInToSpace) { | |
726 // Do not attempt to promote unless to_space is empty | |
727 if (!young_gen->to_space()->is_empty()) { | |
728 _consecutive_skipped_scavenges++; | |
729 if (UsePerfData) { | |
730 counters->update_scavenge_skipped(to_space_not_empty); | |
731 } | |
732 return false; | |
733 } | |
734 } | |
735 | |
736 // Test to see if the scavenge will likely fail. | |
737 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
738 | |
739 // A similar test is done in the policy's should_full_GC(). If this is | |
740 // changed, decide if that test should also be changed. | |
741 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
742 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
743 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
744 | |
745 if (PrintGCDetails && Verbose) { | |
746 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
747 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
748 " padded_average_promoted " SIZE_FORMAT | |
749 " free in old gen " SIZE_FORMAT, | |
750 (size_t) policy->average_promoted_in_bytes(), | |
751 (size_t) policy->padded_average_promoted_in_bytes(), | |
752 old_gen->free_in_bytes()); | |
753 if (young_gen->used_in_bytes() < | |
754 (size_t) policy->padded_average_promoted_in_bytes()) { | |
755 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
756 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
757 } | |
758 } | |
759 | |
760 if (result) { | |
761 _consecutive_skipped_scavenges = 0; | |
762 } else { | |
763 _consecutive_skipped_scavenges++; | |
764 if (UsePerfData) { | |
765 counters->update_scavenge_skipped(promoted_too_large); | |
766 } | |
767 } | |
768 return result; | |
769 } | |
770 | |
771 // Used to add tasks | |
772 GCTaskManager* const PSScavenge::gc_task_manager() { | |
773 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
774 "shouldn't return NULL"); | |
775 return ParallelScavengeHeap::gc_task_manager(); | |
776 } | |
777 | |
778 void PSScavenge::initialize() { | |
779 // Arguments must have been parsed | |
780 | |
781 if (AlwaysTenure) { | |
782 _tenuring_threshold = 0; | |
783 } else if (NeverTenure) { | |
784 _tenuring_threshold = markOopDesc::max_age + 1; | |
785 } else { | |
786 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
787 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
788 MaxTenuringThreshold; | |
789 } | |
790 | |
791 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
792 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
793 | |
794 PSYoungGen* young_gen = heap->young_gen(); | |
795 PSOldGen* old_gen = heap->old_gen(); | |
796 PSPermGen* perm_gen = heap->perm_gen(); | |
797 | |
798 // Set boundary between young_gen and old_gen | |
799 assert(perm_gen->reserved().end() <= old_gen->object_space()->bottom(), | |
800 "perm above old"); | |
801 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
802 "old above young"); | |
803 _young_generation_boundary = young_gen->eden_space()->bottom(); | |
804 | |
805 // Initialize ref handling object for scavenging. | |
806 MemRegion mr = young_gen->reserved(); | |
2369
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807 _ref_processor = |
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808 new ReferenceProcessor(mr, // span |
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809 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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810 (int) ParallelGCThreads, // mt processing degree |
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811 true, // mt discovery |
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812 (int) ParallelGCThreads, // mt discovery degree |
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813 true, // atomic_discovery |
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814 NULL, // header provides liveness info |
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815 false); // next field updates do not need write barrier |
0 | 816 |
817 // Cache the cardtable | |
818 BarrierSet* bs = Universe::heap()->barrier_set(); | |
819 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
820 _card_table = (CardTableExtension*)bs; | |
821 | |
822 _counters = new CollectorCounters("PSScavenge", 0); | |
823 } |