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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 4625:73f935f28920
in esa mode, check that values in stateAfter are all ready after LIRGen of a ValudeNode
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Fri, 17 Feb 2012 11:37:44 +0100 |
parents | bca17e38de00 |
children | aa3d708d67c4 |
rev | line source |
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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 | |
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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(); | |
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184 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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185 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 186 q->enqueue(new PSRefProcTaskProxy(task, i)); |
187 } | |
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188 ParallelTaskTerminator terminator(manager->active_workers(), |
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189 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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190 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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191 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 192 q->enqueue(new StealTask(&terminator)); |
193 } | |
194 } | |
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195 manager->execute_and_wait(q); |
0 | 196 } |
197 | |
198 | |
199 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
200 { | |
201 GCTaskQueue* q = GCTaskQueue::create(); | |
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202 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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203 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 204 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
205 } | |
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206 manager->execute_and_wait(q); |
0 | 207 } |
208 | |
209 // This method contains all heap specific policy for invoking scavenge. | |
210 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
211 // scavenge. It will not clean up after failed promotions, bail out if | |
212 // we've exceeded policy time limits, or any other special behavior. | |
213 // All such policy should be placed here. | |
214 // | |
215 // Note that this method should only be called from the vm_thread while | |
216 // at a safepoint! | |
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217 void PSScavenge::invoke() { |
0 | 218 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
219 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
220 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
221 | |
222 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
223 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
224 | |
225 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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226 IsGCActiveMark mark; |
0 | 227 |
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228 bool scavenge_was_done = PSScavenge::invoke_no_policy(); |
0 | 229 |
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230 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); |
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231 if (UsePerfData) |
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232 counters->update_full_follows_scavenge(0); |
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233 if (!scavenge_was_done || |
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234 policy->should_full_GC(heap->old_gen()->free_in_bytes())) { |
0 | 235 if (UsePerfData) |
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236 counters->update_full_follows_scavenge(full_follows_scavenge); |
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237 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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238 CollectorPolicy* cp = heap->collector_policy(); |
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239 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 240 |
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241 if (UseParallelOldGC) { |
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242 PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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243 } else { |
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244 PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 245 } |
246 } | |
247 } | |
248 | |
249 // This method contains no policy. You should probably | |
250 // be calling invoke() instead. | |
251 bool PSScavenge::invoke_no_policy() { | |
252 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
253 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
254 | |
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255 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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256 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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257 |
0 | 258 TimeStamp scavenge_entry; |
259 TimeStamp scavenge_midpoint; | |
260 TimeStamp scavenge_exit; | |
261 | |
262 scavenge_entry.update(); | |
263 | |
264 if (GC_locker::check_active_before_gc()) { | |
265 return false; | |
266 } | |
267 | |
268 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
269 GCCause::Cause gc_cause = heap->gc_cause(); | |
270 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
271 | |
272 // Check for potential problems. | |
273 if (!should_attempt_scavenge()) { | |
274 return false; | |
275 } | |
276 | |
277 bool promotion_failure_occurred = false; | |
278 | |
279 PSYoungGen* young_gen = heap->young_gen(); | |
280 PSOldGen* old_gen = heap->old_gen(); | |
281 PSPermGen* perm_gen = heap->perm_gen(); | |
282 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
283 heap->increment_total_collections(); | |
284 | |
285 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
286 | |
287 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
288 UseAdaptiveSizePolicyWithSystemGC) { | |
289 // Gather the feedback data for eden occupancy. | |
290 young_gen->eden_space()->accumulate_statistics(); | |
291 } | |
292 | |
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293 if (ZapUnusedHeapArea) { |
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294 // Save information needed to minimize mangling |
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295 heap->record_gen_tops_before_GC(); |
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296 } |
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297 |
0 | 298 if (PrintHeapAtGC) { |
299 Universe::print_heap_before_gc(); | |
300 } | |
301 | |
302 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
303 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
304 | |
305 size_t prev_used = heap->used(); | |
306 assert(promotion_failed() == false, "Sanity"); | |
307 | |
308 // Fill in TLABs | |
309 heap->accumulate_statistics_all_tlabs(); | |
310 heap->ensure_parsability(true); // retire TLABs | |
311 | |
312 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
313 HandleMark hm; // Discard invalid handles created during verification | |
314 gclog_or_tty->print(" VerifyBeforeGC:"); | |
315 Universe::verify(true); | |
316 } | |
317 | |
318 { | |
319 ResourceMark rm; | |
320 HandleMark hm; | |
321 | |
322 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
323 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
324 TraceTime t1("GC", PrintGC, !PrintGCDetails, gclog_or_tty); | |
325 TraceCollectorStats tcs(counters()); | |
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326 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 327 |
328 if (TraceGen0Time) accumulated_time()->start(); | |
329 | |
330 // Let the size policy know we're starting | |
331 size_policy->minor_collection_begin(); | |
332 | |
333 // Verify the object start arrays. | |
334 if (VerifyObjectStartArray && | |
335 VerifyBeforeGC) { | |
336 old_gen->verify_object_start_array(); | |
337 perm_gen->verify_object_start_array(); | |
338 } | |
339 | |
340 // Verify no unmarked old->young roots | |
341 if (VerifyRememberedSets) { | |
342 CardTableExtension::verify_all_young_refs_imprecise(); | |
343 } | |
344 | |
345 if (!ScavengeWithObjectsInToSpace) { | |
346 assert(young_gen->to_space()->is_empty(), | |
347 "Attempt to scavenge with live objects in to_space"); | |
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348 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 349 } else if (ZapUnusedHeapArea) { |
350 young_gen->to_space()->mangle_unused_area(); | |
351 } | |
352 save_to_space_top_before_gc(); | |
353 | |
354 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
355 | |
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356 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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357 reference_processor()->setup_policy(false); |
0 | 358 |
359 // We track how much was promoted to the next generation for | |
360 // the AdaptiveSizePolicy. | |
361 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
362 | |
363 // For PrintGCDetails | |
364 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
365 | |
366 // Reset our survivor overflow. | |
367 set_survivor_overflow(false); | |
368 | |
369 // We need to save the old/perm top values before | |
370 // creating the promotion_manager. We pass the top | |
371 // values to the card_table, to prevent it from | |
372 // straying into the promotion labs. | |
373 HeapWord* old_top = old_gen->object_space()->top(); | |
374 HeapWord* perm_top = perm_gen->object_space()->top(); | |
375 | |
376 // Release all previously held resources | |
377 gc_task_manager()->release_all_resources(); | |
378 | |
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379 // Set the number of GC threads to be used in this collection |
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380 gc_task_manager()->set_active_gang(); |
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381 gc_task_manager()->task_idle_workers(); |
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382 // Get the active number of workers here and use that value |
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383 // throughout the methods. |
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384 uint active_workers = gc_task_manager()->active_workers(); |
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385 heap->set_par_threads(active_workers); |
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386 |
0 | 387 PSPromotionManager::pre_scavenge(); |
388 | |
389 // We'll use the promotion manager again later. | |
390 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
391 { | |
392 // TraceTime("Roots"); | |
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393 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 394 |
395 GCTaskQueue* q = GCTaskQueue::create(); | |
396 | |
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397 uint stripe_total = active_workers; |
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398 for(uint i=0; i < stripe_total; i++) { |
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399 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); |
0 | 400 } |
401 | |
402 q->enqueue(new SerialOldToYoungRootsTask(perm_gen, perm_top)); | |
403 | |
404 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
405 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
406 // We scan the thread roots in parallel | |
407 Threads::create_thread_roots_tasks(q); | |
408 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
409 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
410 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
411 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
412 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); | |
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413 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 414 |
415 ParallelTaskTerminator terminator( | |
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416 active_workers, |
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417 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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418 if (active_workers > 1) { |
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419 for (uint j = 0; j < active_workers; j++) { |
0 | 420 q->enqueue(new StealTask(&terminator)); |
421 } | |
422 } | |
423 | |
424 gc_task_manager()->execute_and_wait(q); | |
425 } | |
426 | |
427 scavenge_midpoint.update(); | |
428 | |
429 // Process reference objects discovered during scavenge | |
430 { | |
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431 reference_processor()->setup_policy(false); // not always_clear |
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432 reference_processor()->set_active_mt_degree(active_workers); |
0 | 433 PSKeepAliveClosure keep_alive(promotion_manager); |
434 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
435 if (reference_processor()->processing_is_mt()) { | |
436 PSRefProcTaskExecutor task_executor; | |
437 reference_processor()->process_discovered_references( | |
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438 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
0 | 439 } else { |
440 reference_processor()->process_discovered_references( | |
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441 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
0 | 442 } |
443 } | |
444 | |
445 // Enqueue reference objects discovered during scavenge. | |
446 if (reference_processor()->processing_is_mt()) { | |
447 PSRefProcTaskExecutor task_executor; | |
448 reference_processor()->enqueue_discovered_references(&task_executor); | |
449 } else { | |
450 reference_processor()->enqueue_discovered_references(NULL); | |
451 } | |
452 | |
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453 if (!JavaObjectsInPerm) { |
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454 // Unlink any dead interned Strings |
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455 StringTable::unlink(&_is_alive_closure); |
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456 // Process the remaining live ones |
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457 PSScavengeRootsClosure root_closure(promotion_manager); |
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458 StringTable::oops_do(&root_closure); |
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459 } |
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460 |
0 | 461 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
462 PSPromotionManager::post_scavenge(); | |
463 | |
464 promotion_failure_occurred = promotion_failed(); | |
465 if (promotion_failure_occurred) { | |
466 clean_up_failed_promotion(); | |
467 if (PrintGC) { | |
468 gclog_or_tty->print("--"); | |
469 } | |
470 } | |
471 | |
472 // Let the size policy know we're done. Note that we count promotion | |
473 // failure cleanup time as part of the collection (otherwise, we're | |
474 // implicitly saying it's mutator time). | |
475 size_policy->minor_collection_end(gc_cause); | |
476 | |
477 if (!promotion_failure_occurred) { | |
478 // Swap the survivor spaces. | |
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479 |
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480 |
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481 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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482 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 483 young_gen->swap_spaces(); |
484 | |
485 size_t survived = young_gen->from_space()->used_in_bytes(); | |
486 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
487 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
488 | |
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489 // A successful scavenge should restart the GC time limit count which is |
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490 // for full GC's. |
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491 size_policy->reset_gc_overhead_limit_count(); |
0 | 492 if (UseAdaptiveSizePolicy) { |
493 // Calculate the new survivor size and tenuring threshold | |
494 | |
495 if (PrintAdaptiveSizePolicy) { | |
496 gclog_or_tty->print("AdaptiveSizeStart: "); | |
497 gclog_or_tty->stamp(); | |
498 gclog_or_tty->print_cr(" collection: %d ", | |
499 heap->total_collections()); | |
500 | |
501 if (Verbose) { | |
502 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
503 " perm_gen_capacity: %d ", | |
504 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
505 perm_gen->capacity_in_bytes()); | |
506 } | |
507 } | |
508 | |
509 | |
510 if (UsePerfData) { | |
511 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
512 counters->update_old_eden_size( | |
513 size_policy->calculated_eden_size_in_bytes()); | |
514 counters->update_old_promo_size( | |
515 size_policy->calculated_promo_size_in_bytes()); | |
516 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
517 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
518 counters->update_survived(survived); | |
519 counters->update_promoted(promoted); | |
520 counters->update_survivor_overflowed(_survivor_overflow); | |
521 } | |
522 | |
523 size_t survivor_limit = | |
524 size_policy->max_survivor_size(young_gen->max_size()); | |
525 _tenuring_threshold = | |
526 size_policy->compute_survivor_space_size_and_threshold( | |
527 _survivor_overflow, | |
528 _tenuring_threshold, | |
529 survivor_limit); | |
530 | |
531 if (PrintTenuringDistribution) { | |
532 gclog_or_tty->cr(); | |
533 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)", | |
534 size_policy->calculated_survivor_size_in_bytes(), | |
535 _tenuring_threshold, MaxTenuringThreshold); | |
536 } | |
537 | |
538 if (UsePerfData) { | |
539 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
540 counters->update_tenuring_threshold(_tenuring_threshold); | |
541 counters->update_survivor_size_counters(); | |
542 } | |
543 | |
544 // Do call at minor collections? | |
545 // Don't check if the size_policy is ready at this | |
546 // level. Let the size_policy check that internally. | |
547 if (UseAdaptiveSizePolicy && | |
548 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
549 ((gc_cause != GCCause::_java_lang_system_gc) || | |
550 UseAdaptiveSizePolicyWithSystemGC)) { | |
551 | |
552 // Calculate optimial free space amounts | |
553 assert(young_gen->max_size() > | |
554 young_gen->from_space()->capacity_in_bytes() + | |
555 young_gen->to_space()->capacity_in_bytes(), | |
556 "Sizes of space in young gen are out-of-bounds"); | |
557 size_t max_eden_size = young_gen->max_size() - | |
558 young_gen->from_space()->capacity_in_bytes() - | |
559 young_gen->to_space()->capacity_in_bytes(); | |
560 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
561 young_gen->eden_space()->used_in_bytes(), | |
562 old_gen->used_in_bytes(), | |
563 perm_gen->used_in_bytes(), | |
564 young_gen->eden_space()->capacity_in_bytes(), | |
565 old_gen->max_gen_size(), | |
566 max_eden_size, | |
567 false /* full gc*/, | |
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568 gc_cause, |
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569 heap->collector_policy()); |
0 | 570 |
571 } | |
572 // Resize the young generation at every collection | |
573 // even if new sizes have not been calculated. This is | |
574 // to allow resizes that may have been inhibited by the | |
575 // relative location of the "to" and "from" spaces. | |
576 | |
577 // Resizing the old gen at minor collects can cause increases | |
578 // that don't feed back to the generation sizing policy until | |
579 // a major collection. Don't resize the old gen here. | |
580 | |
581 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
582 size_policy->calculated_survivor_size_in_bytes()); | |
583 | |
584 if (PrintAdaptiveSizePolicy) { | |
585 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
586 heap->total_collections()); | |
587 } | |
588 } | |
589 | |
590 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
591 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
592 // Also update() will case adaptive NUMA chunk resizing. | |
593 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
594 young_gen->eden_space()->update(); | |
595 | |
596 heap->gc_policy_counters()->update_counters(); | |
597 | |
598 heap->resize_all_tlabs(); | |
599 | |
600 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
601 } | |
602 | |
603 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
604 | |
605 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
606 | |
607 // Re-verify object start arrays | |
608 if (VerifyObjectStartArray && | |
609 VerifyAfterGC) { | |
610 old_gen->verify_object_start_array(); | |
611 perm_gen->verify_object_start_array(); | |
612 } | |
613 | |
614 // Verify all old -> young cards are now precise | |
615 if (VerifyRememberedSets) { | |
616 // Precise verification will give false positives. Until this is fixed, | |
617 // use imprecise verification. | |
618 // CardTableExtension::verify_all_young_refs_precise(); | |
619 CardTableExtension::verify_all_young_refs_imprecise(); | |
620 } | |
621 | |
622 if (TraceGen0Time) accumulated_time()->stop(); | |
623 | |
624 if (PrintGC) { | |
625 if (PrintGCDetails) { | |
626 // Don't print a GC timestamp here. This is after the GC so | |
627 // would be confusing. | |
628 young_gen->print_used_change(young_gen_used_before); | |
629 } | |
630 heap->print_heap_change(prev_used); | |
631 } | |
632 | |
633 // Track memory usage and detect low memory | |
634 MemoryService::track_memory_usage(); | |
635 heap->update_counters(); | |
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636 |
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637 gc_task_manager()->release_idle_workers(); |
0 | 638 } |
639 | |
640 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
641 HandleMark hm; // Discard invalid handles created during verification | |
642 gclog_or_tty->print(" VerifyAfterGC:"); | |
643 Universe::verify(false); | |
644 } | |
645 | |
646 if (PrintHeapAtGC) { | |
647 Universe::print_heap_after_gc(); | |
648 } | |
649 | |
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650 if (ZapUnusedHeapArea) { |
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651 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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652 young_gen->from_space()->check_mangled_unused_area_complete(); |
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653 young_gen->to_space()->check_mangled_unused_area_complete(); |
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654 } |
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655 |
0 | 656 scavenge_exit.update(); |
657 | |
658 if (PrintGCTaskTimeStamps) { | |
659 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
660 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
661 scavenge_exit.ticks()); | |
662 gc_task_manager()->print_task_time_stamps(); | |
663 } | |
664 | |
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665 #ifdef TRACESPINNING |
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666 ParallelTaskTerminator::print_termination_counts(); |
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667 #endif |
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668 |
0 | 669 return !promotion_failure_occurred; |
670 } | |
671 | |
672 // This method iterates over all objects in the young generation, | |
673 // unforwarding markOops. It then restores any preserved mark oops, | |
674 // and clears the _preserved_mark_stack. | |
675 void PSScavenge::clean_up_failed_promotion() { | |
676 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
677 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
678 assert(promotion_failed(), "Sanity"); | |
679 | |
680 PSYoungGen* young_gen = heap->young_gen(); | |
681 | |
682 { | |
683 ResourceMark rm; | |
684 | |
685 // Unforward all pointers in the young gen. | |
686 PSPromotionFailedClosure unforward_closure; | |
687 young_gen->object_iterate(&unforward_closure); | |
688 | |
689 if (PrintGC && Verbose) { | |
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690 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 691 } |
692 | |
693 // Restore any saved marks. | |
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694 while (!_preserved_oop_stack.is_empty()) { |
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695 oop obj = _preserved_oop_stack.pop(); |
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696 markOop mark = _preserved_mark_stack.pop(); |
0 | 697 obj->set_mark(mark); |
698 } | |
699 | |
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700 // Clear the preserved mark and oop stack caches. |
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701 _preserved_mark_stack.clear(true); |
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702 _preserved_oop_stack.clear(true); |
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703 _promotion_failed = false; |
0 | 704 } |
705 | |
706 // Reset the PromotionFailureALot counters. | |
707 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
708 } | |
709 | |
710 // This method is called whenever an attempt to promote an object | |
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711 // fails. Some markOops will need preservation, some will not. Note |
0 | 712 // that the entire eden is traversed after a failed promotion, with |
713 // all forwarded headers replaced by the default markOop. This means | |
714 // it is not neccessary to preserve most markOops. | |
715 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
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716 _promotion_failed = true; |
0 | 717 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
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718 // Should use per-worker private stakcs hetre rather than |
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719 // locking a common pair of stacks. |
0 | 720 ThreadCritical tc; |
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721 _preserved_oop_stack.push(obj); |
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722 _preserved_mark_stack.push(obj_mark); |
0 | 723 } |
724 } | |
725 | |
726 bool PSScavenge::should_attempt_scavenge() { | |
727 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
728 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
729 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
730 | |
731 if (UsePerfData) { | |
732 counters->update_scavenge_skipped(not_skipped); | |
733 } | |
734 | |
735 PSYoungGen* young_gen = heap->young_gen(); | |
736 PSOldGen* old_gen = heap->old_gen(); | |
737 | |
738 if (!ScavengeWithObjectsInToSpace) { | |
739 // Do not attempt to promote unless to_space is empty | |
740 if (!young_gen->to_space()->is_empty()) { | |
741 _consecutive_skipped_scavenges++; | |
742 if (UsePerfData) { | |
743 counters->update_scavenge_skipped(to_space_not_empty); | |
744 } | |
745 return false; | |
746 } | |
747 } | |
748 | |
749 // Test to see if the scavenge will likely fail. | |
750 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
751 | |
752 // A similar test is done in the policy's should_full_GC(). If this is | |
753 // changed, decide if that test should also be changed. | |
754 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
755 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
756 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
757 | |
758 if (PrintGCDetails && Verbose) { | |
759 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
760 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
761 " padded_average_promoted " SIZE_FORMAT | |
762 " free in old gen " SIZE_FORMAT, | |
763 (size_t) policy->average_promoted_in_bytes(), | |
764 (size_t) policy->padded_average_promoted_in_bytes(), | |
765 old_gen->free_in_bytes()); | |
766 if (young_gen->used_in_bytes() < | |
767 (size_t) policy->padded_average_promoted_in_bytes()) { | |
768 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
769 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
770 } | |
771 } | |
772 | |
773 if (result) { | |
774 _consecutive_skipped_scavenges = 0; | |
775 } else { | |
776 _consecutive_skipped_scavenges++; | |
777 if (UsePerfData) { | |
778 counters->update_scavenge_skipped(promoted_too_large); | |
779 } | |
780 } | |
781 return result; | |
782 } | |
783 | |
784 // Used to add tasks | |
785 GCTaskManager* const PSScavenge::gc_task_manager() { | |
786 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
787 "shouldn't return NULL"); | |
788 return ParallelScavengeHeap::gc_task_manager(); | |
789 } | |
790 | |
791 void PSScavenge::initialize() { | |
792 // Arguments must have been parsed | |
793 | |
794 if (AlwaysTenure) { | |
795 _tenuring_threshold = 0; | |
796 } else if (NeverTenure) { | |
797 _tenuring_threshold = markOopDesc::max_age + 1; | |
798 } else { | |
799 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
800 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
801 MaxTenuringThreshold; | |
802 } | |
803 | |
804 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
805 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
806 | |
807 PSYoungGen* young_gen = heap->young_gen(); | |
808 PSOldGen* old_gen = heap->old_gen(); | |
809 PSPermGen* perm_gen = heap->perm_gen(); | |
810 | |
811 // Set boundary between young_gen and old_gen | |
812 assert(perm_gen->reserved().end() <= old_gen->object_space()->bottom(), | |
813 "perm above old"); | |
814 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
815 "old above young"); | |
816 _young_generation_boundary = young_gen->eden_space()->bottom(); | |
817 | |
818 // Initialize ref handling object for scavenging. | |
819 MemRegion mr = young_gen->reserved(); | |
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820 |
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821 _ref_processor = |
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822 new ReferenceProcessor(mr, // span |
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823 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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824 (int) ParallelGCThreads, // mt processing degree |
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825 true, // mt discovery |
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826 (int) ParallelGCThreads, // mt discovery degree |
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827 true, // atomic_discovery |
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828 NULL, // header provides liveness info |
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829 false); // next field updates do not need write barrier |
0 | 830 |
831 // Cache the cardtable | |
832 BarrierSet* bs = Universe::heap()->barrier_set(); | |
833 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
834 _card_table = (CardTableExtension*)bs; | |
835 | |
836 _counters = new CollectorCounters("PSScavenge", 0); | |
837 } |