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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 14909:4ca6dc0799b6
Backout jdk9 merge
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Tue, 01 Apr 2014 13:57:07 +0200 |
parents | 44315152d434 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
14909 | 2 * Copyright (c) 2002, 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" |
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26 #include "classfile/symbolTable.hpp" |
4909 | 27 #include "code/codeCache.hpp" |
1972 | 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.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" | |
10405 | 36 #include "gc_implementation/shared/gcHeapSummary.hpp" |
37 #include "gc_implementation/shared/gcTimer.hpp" | |
38 #include "gc_implementation/shared/gcTrace.hpp" | |
39 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 40 #include "gc_implementation/shared/isGCActiveMark.hpp" |
41 #include "gc_implementation/shared/spaceDecorator.hpp" | |
42 #include "gc_interface/gcCause.hpp" | |
43 #include "memory/collectorPolicy.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/referenceProcessor.hpp" | |
47 #include "memory/resourceArea.hpp" | |
48 #include "oops/oop.inline.hpp" | |
49 #include "oops/oop.psgc.inline.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/fprofiler.hpp" | |
52 #include "runtime/handles.inline.hpp" | |
53 #include "runtime/threadCritical.hpp" | |
54 #include "runtime/vmThread.hpp" | |
55 #include "runtime/vm_operations.hpp" | |
56 #include "services/memoryService.hpp" | |
57 #include "utilities/stack.inline.hpp" | |
0 | 58 |
59 | |
60 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
61 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
62 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
63 CardTableExtension* PSScavenge::_card_table = NULL; | |
64 bool PSScavenge::_survivor_overflow = false; | |
6818 | 65 uint PSScavenge::_tenuring_threshold = 0; |
0 | 66 HeapWord* PSScavenge::_young_generation_boundary = NULL; |
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67 uintptr_t PSScavenge::_young_generation_boundary_compressed = 0; |
0 | 68 elapsedTimer PSScavenge::_accumulated_time; |
10405 | 69 STWGCTimer PSScavenge::_gc_timer; |
70 ParallelScavengeTracer PSScavenge::_gc_tracer; | |
6197 | 71 Stack<markOop, mtGC> PSScavenge::_preserved_mark_stack; |
72 Stack<oop, mtGC> PSScavenge::_preserved_oop_stack; | |
0 | 73 CollectorCounters* PSScavenge::_counters = NULL; |
74 | |
75 // Define before use | |
76 class PSIsAliveClosure: public BoolObjectClosure { | |
77 public: | |
78 bool do_object_b(oop p) { | |
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79 return (!PSScavenge::is_obj_in_young(p)) || p->is_forwarded(); |
0 | 80 } |
81 }; | |
82 | |
83 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
84 | |
85 class PSKeepAliveClosure: public OopClosure { | |
86 protected: | |
87 MutableSpace* _to_space; | |
88 PSPromotionManager* _promotion_manager; | |
89 | |
90 public: | |
91 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
92 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
93 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
94 _to_space = heap->young_gen()->to_space(); | |
95 | |
96 assert(_promotion_manager != NULL, "Sanity"); | |
97 } | |
98 | |
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99 template <class T> void do_oop_work(T* p) { |
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100 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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101 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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102 "expected an oop while scanning weak refs"); |
0 | 103 |
104 // Weak refs may be visited more than once. | |
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105 if (PSScavenge::should_scavenge(p, _to_space)) { |
4909 | 106 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
0 | 107 } |
108 } | |
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109 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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110 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 111 }; |
112 | |
113 class PSEvacuateFollowersClosure: public VoidClosure { | |
114 private: | |
115 PSPromotionManager* _promotion_manager; | |
116 public: | |
117 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
118 | |
113
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119 virtual void do_void() { |
0 | 120 assert(_promotion_manager != NULL, "Sanity"); |
121 _promotion_manager->drain_stacks(true); | |
122 guarantee(_promotion_manager->stacks_empty(), | |
123 "stacks should be empty at this point"); | |
124 } | |
125 }; | |
126 | |
127 class PSPromotionFailedClosure : public ObjectClosure { | |
128 virtual void do_object(oop obj) { | |
129 if (obj->is_forwarded()) { | |
130 obj->init_mark(); | |
131 } | |
132 } | |
133 }; | |
134 | |
135 class PSRefProcTaskProxy: public GCTask { | |
136 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
137 ProcessTask & _rp_task; | |
138 uint _work_id; | |
139 public: | |
140 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
141 : _rp_task(rp_task), | |
142 _work_id(work_id) | |
143 { } | |
144 | |
145 private: | |
146 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
147 virtual void do_it(GCTaskManager* manager, uint which); | |
148 }; | |
149 | |
150 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
151 { | |
152 PSPromotionManager* promotion_manager = | |
153 PSPromotionManager::gc_thread_promotion_manager(which); | |
154 assert(promotion_manager != NULL, "sanity check"); | |
155 PSKeepAliveClosure keep_alive(promotion_manager); | |
156 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
157 PSIsAliveClosure is_alive; | |
158 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
159 } | |
160 | |
161 class PSRefEnqueueTaskProxy: public GCTask { | |
162 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
163 EnqueueTask& _enq_task; | |
164 uint _work_id; | |
165 | |
166 public: | |
167 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
168 : _enq_task(enq_task), | |
169 _work_id(work_id) | |
170 { } | |
171 | |
172 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
173 virtual void do_it(GCTaskManager* manager, uint which) | |
174 { | |
175 _enq_task.work(_work_id); | |
176 } | |
177 }; | |
178 | |
179 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
180 virtual void execute(ProcessTask& task); | |
181 virtual void execute(EnqueueTask& task); | |
182 }; | |
183 | |
184 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
185 { | |
186 GCTaskQueue* q = GCTaskQueue::create(); | |
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187 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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188 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 189 q->enqueue(new PSRefProcTaskProxy(task, i)); |
190 } | |
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191 ParallelTaskTerminator terminator(manager->active_workers(), |
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192 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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193 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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194 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 195 q->enqueue(new StealTask(&terminator)); |
196 } | |
197 } | |
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198 manager->execute_and_wait(q); |
0 | 199 } |
200 | |
201 | |
202 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
203 { | |
204 GCTaskQueue* q = GCTaskQueue::create(); | |
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205 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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206 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 207 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
208 } | |
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209 manager->execute_and_wait(q); |
0 | 210 } |
211 | |
212 // This method contains all heap specific policy for invoking scavenge. | |
213 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
214 // scavenge. It will not clean up after failed promotions, bail out if | |
215 // we've exceeded policy time limits, or any other special behavior. | |
216 // All such policy should be placed here. | |
217 // | |
218 // Note that this method should only be called from the vm_thread while | |
219 // at a safepoint! | |
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220 bool PSScavenge::invoke() { |
0 | 221 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
222 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
223 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
224 | |
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225 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
0 | 226 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
227 | |
228 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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229 IsGCActiveMark mark; |
0 | 230 |
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231 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
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232 const bool need_full_gc = !scavenge_done || |
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233 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
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234 bool full_gc_done = false; |
0 | 235 |
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236 if (UsePerfData) { |
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237 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
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238 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
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239 counters->update_full_follows_scavenge(ffs_val); |
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240 } |
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241 |
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242 if (need_full_gc) { |
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243 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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244 CollectorPolicy* cp = heap->collector_policy(); |
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245 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 246 |
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247 if (UseParallelOldGC) { |
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248 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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249 } else { |
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250 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 251 } |
252 } | |
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253 |
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254 return full_gc_done; |
0 | 255 } |
256 | |
257 // This method contains no policy. You should probably | |
258 // be calling invoke() instead. | |
259 bool PSScavenge::invoke_no_policy() { | |
260 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
261 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
262 | |
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263 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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264 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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265 |
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266 _gc_timer.register_gc_start(); |
10405 | 267 |
0 | 268 TimeStamp scavenge_entry; |
269 TimeStamp scavenge_midpoint; | |
270 TimeStamp scavenge_exit; | |
271 | |
272 scavenge_entry.update(); | |
273 | |
274 if (GC_locker::check_active_before_gc()) { | |
275 return false; | |
276 } | |
277 | |
278 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
279 GCCause::Cause gc_cause = heap->gc_cause(); | |
280 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
281 | |
282 // Check for potential problems. | |
283 if (!should_attempt_scavenge()) { | |
284 return false; | |
285 } | |
286 | |
10405 | 287 _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start()); |
288 | |
0 | 289 bool promotion_failure_occurred = false; |
290 | |
291 PSYoungGen* young_gen = heap->young_gen(); | |
292 PSOldGen* old_gen = heap->old_gen(); | |
293 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
10405 | 294 |
0 | 295 heap->increment_total_collections(); |
296 | |
297 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
298 | |
299 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
300 UseAdaptiveSizePolicyWithSystemGC) { | |
301 // Gather the feedback data for eden occupancy. | |
302 young_gen->eden_space()->accumulate_statistics(); | |
303 } | |
304 | |
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305 if (ZapUnusedHeapArea) { |
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306 // Save information needed to minimize mangling |
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307 heap->record_gen_tops_before_GC(); |
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308 } |
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309 |
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310 heap->print_heap_before_gc(); |
10405 | 311 heap->trace_heap_before_gc(&_gc_tracer); |
0 | 312 |
313 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
314 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
315 | |
316 size_t prev_used = heap->used(); | |
317 | |
318 // Fill in TLABs | |
319 heap->accumulate_statistics_all_tlabs(); | |
320 heap->ensure_parsability(true); // retire TLABs | |
321 | |
322 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
323 HandleMark hm; // Discard invalid handles created during verification | |
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324 Universe::verify(" VerifyBeforeGC:"); |
0 | 325 } |
326 | |
327 { | |
328 ResourceMark rm; | |
329 HandleMark hm; | |
330 | |
331 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
332 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
10405 | 333 GCTraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
0 | 334 TraceCollectorStats tcs(counters()); |
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335 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 336 |
337 if (TraceGen0Time) accumulated_time()->start(); | |
338 | |
339 // Let the size policy know we're starting | |
340 size_policy->minor_collection_begin(); | |
341 | |
342 // Verify the object start arrays. | |
343 if (VerifyObjectStartArray && | |
344 VerifyBeforeGC) { | |
345 old_gen->verify_object_start_array(); | |
346 } | |
347 | |
348 // Verify no unmarked old->young roots | |
349 if (VerifyRememberedSets) { | |
350 CardTableExtension::verify_all_young_refs_imprecise(); | |
351 } | |
352 | |
353 if (!ScavengeWithObjectsInToSpace) { | |
354 assert(young_gen->to_space()->is_empty(), | |
355 "Attempt to scavenge with live objects in to_space"); | |
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356 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 357 } else if (ZapUnusedHeapArea) { |
358 young_gen->to_space()->mangle_unused_area(); | |
359 } | |
360 save_to_space_top_before_gc(); | |
361 | |
362 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
363 | |
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364 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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365 reference_processor()->setup_policy(false); |
0 | 366 |
367 // We track how much was promoted to the next generation for | |
368 // the AdaptiveSizePolicy. | |
369 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
370 | |
371 // For PrintGCDetails | |
372 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
373 | |
374 // Reset our survivor overflow. | |
375 set_survivor_overflow(false); | |
376 | |
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377 // We need to save the old top values before |
0 | 378 // creating the promotion_manager. We pass the top |
379 // values to the card_table, to prevent it from | |
380 // straying into the promotion labs. | |
381 HeapWord* old_top = old_gen->object_space()->top(); | |
382 | |
383 // Release all previously held resources | |
384 gc_task_manager()->release_all_resources(); | |
385 | |
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386 // Set the number of GC threads to be used in this collection |
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387 gc_task_manager()->set_active_gang(); |
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388 gc_task_manager()->task_idle_workers(); |
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389 // Get the active number of workers here and use that value |
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390 // throughout the methods. |
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391 uint active_workers = gc_task_manager()->active_workers(); |
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392 heap->set_par_threads(active_workers); |
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393 |
0 | 394 PSPromotionManager::pre_scavenge(); |
395 | |
396 // We'll use the promotion manager again later. | |
397 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
398 { | |
10405 | 399 GCTraceTime tm("Scavenge", false, false, &_gc_timer); |
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400 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 401 |
402 GCTaskQueue* q = GCTaskQueue::create(); | |
403 | |
6817 | 404 if (!old_gen->object_space()->is_empty()) { |
405 // There are only old-to-young pointers if there are objects | |
406 // in the old gen. | |
407 uint stripe_total = active_workers; | |
408 for(uint i=0; i < stripe_total; i++) { | |
409 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); | |
410 } | |
0 | 411 } |
412 | |
413 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
414 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
415 // We scan the thread roots in parallel | |
416 Threads::create_thread_roots_tasks(q); | |
417 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
418 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
419 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
420 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
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421 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::class_loader_data)); |
0 | 422 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); |
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423 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 424 |
425 ParallelTaskTerminator terminator( | |
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426 active_workers, |
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427 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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428 if (active_workers > 1) { |
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429 for (uint j = 0; j < active_workers; j++) { |
0 | 430 q->enqueue(new StealTask(&terminator)); |
431 } | |
432 } | |
433 | |
434 gc_task_manager()->execute_and_wait(q); | |
435 } | |
436 | |
437 scavenge_midpoint.update(); | |
438 | |
439 // Process reference objects discovered during scavenge | |
440 { | |
10405 | 441 GCTraceTime tm("References", false, false, &_gc_timer); |
442 | |
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443 reference_processor()->setup_policy(false); // not always_clear |
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444 reference_processor()->set_active_mt_degree(active_workers); |
0 | 445 PSKeepAliveClosure keep_alive(promotion_manager); |
446 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
10405 | 447 ReferenceProcessorStats stats; |
0 | 448 if (reference_processor()->processing_is_mt()) { |
449 PSRefProcTaskExecutor task_executor; | |
10405 | 450 stats = reference_processor()->process_discovered_references( |
451 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor, | |
452 &_gc_timer); | |
0 | 453 } else { |
10405 | 454 stats = reference_processor()->process_discovered_references( |
455 &_is_alive_closure, &keep_alive, &evac_followers, NULL, &_gc_timer); | |
456 } | |
457 | |
458 _gc_tracer.report_gc_reference_stats(stats); | |
459 | |
460 // Enqueue reference objects discovered during scavenge. | |
461 if (reference_processor()->processing_is_mt()) { | |
462 PSRefProcTaskExecutor task_executor; | |
463 reference_processor()->enqueue_discovered_references(&task_executor); | |
464 } else { | |
465 reference_processor()->enqueue_discovered_references(NULL); | |
0 | 466 } |
467 } | |
468 | |
14909 | 469 GCTraceTime tm("StringTable", false, false, &_gc_timer); |
470 // Unlink any dead interned Strings and process the remaining live ones. | |
471 PSScavengeRootsClosure root_closure(promotion_manager); | |
472 StringTable::unlink_or_oops_do(&_is_alive_closure, &root_closure); | |
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473 |
0 | 474 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
10405 | 475 promotion_failure_occurred = PSPromotionManager::post_scavenge(_gc_tracer); |
0 | 476 if (promotion_failure_occurred) { |
477 clean_up_failed_promotion(); | |
478 if (PrintGC) { | |
479 gclog_or_tty->print("--"); | |
480 } | |
481 } | |
482 | |
483 // Let the size policy know we're done. Note that we count promotion | |
484 // failure cleanup time as part of the collection (otherwise, we're | |
485 // implicitly saying it's mutator time). | |
486 size_policy->minor_collection_end(gc_cause); | |
487 | |
488 if (!promotion_failure_occurred) { | |
489 // Swap the survivor spaces. | |
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490 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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491 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 492 young_gen->swap_spaces(); |
493 | |
494 size_t survived = young_gen->from_space()->used_in_bytes(); | |
495 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
496 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
497 | |
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498 // A successful scavenge should restart the GC time limit count which is |
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499 // for full GC's. |
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500 size_policy->reset_gc_overhead_limit_count(); |
0 | 501 if (UseAdaptiveSizePolicy) { |
502 // Calculate the new survivor size and tenuring threshold | |
503 | |
504 if (PrintAdaptiveSizePolicy) { | |
505 gclog_or_tty->print("AdaptiveSizeStart: "); | |
506 gclog_or_tty->stamp(); | |
507 gclog_or_tty->print_cr(" collection: %d ", | |
508 heap->total_collections()); | |
509 | |
510 if (Verbose) { | |
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511 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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512 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 513 } |
514 } | |
515 | |
516 | |
517 if (UsePerfData) { | |
518 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
519 counters->update_old_eden_size( | |
520 size_policy->calculated_eden_size_in_bytes()); | |
521 counters->update_old_promo_size( | |
522 size_policy->calculated_promo_size_in_bytes()); | |
523 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
524 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
525 counters->update_survived(survived); | |
526 counters->update_promoted(promoted); | |
527 counters->update_survivor_overflowed(_survivor_overflow); | |
528 } | |
529 | |
530 size_t survivor_limit = | |
14909 | 531 size_policy->max_survivor_size(young_gen->max_size()); |
0 | 532 _tenuring_threshold = |
533 size_policy->compute_survivor_space_size_and_threshold( | |
534 _survivor_overflow, | |
535 _tenuring_threshold, | |
536 survivor_limit); | |
537 | |
538 if (PrintTenuringDistribution) { | |
539 gclog_or_tty->cr(); | |
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540 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
0 | 541 size_policy->calculated_survivor_size_in_bytes(), |
542 _tenuring_threshold, MaxTenuringThreshold); | |
543 } | |
544 | |
545 if (UsePerfData) { | |
546 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
547 counters->update_tenuring_threshold(_tenuring_threshold); | |
548 counters->update_survivor_size_counters(); | |
549 } | |
550 | |
551 // Do call at minor collections? | |
552 // Don't check if the size_policy is ready at this | |
553 // level. Let the size_policy check that internally. | |
14909 | 554 if (UseAdaptiveSizePolicy && |
555 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
0 | 556 ((gc_cause != GCCause::_java_lang_system_gc) || |
557 UseAdaptiveSizePolicyWithSystemGC)) { | |
558 | |
14909 | 559 // Calculate optimial free space amounts |
0 | 560 assert(young_gen->max_size() > |
561 young_gen->from_space()->capacity_in_bytes() + | |
562 young_gen->to_space()->capacity_in_bytes(), | |
563 "Sizes of space in young gen are out-of-bounds"); | |
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564 |
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565 size_t young_live = young_gen->used_in_bytes(); |
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566 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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567 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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568 size_t max_old_gen_size = old_gen->max_gen_size(); |
14909 | 569 size_t max_eden_size = young_gen->max_size() - |
0 | 570 young_gen->from_space()->capacity_in_bytes() - |
571 young_gen->to_space()->capacity_in_bytes(); | |
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572 |
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573 // Used for diagnostics |
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574 size_policy->clear_generation_free_space_flags(); |
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575 |
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576 size_policy->compute_eden_space_size(young_live, |
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577 eden_live, |
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578 cur_eden, |
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579 max_eden_size, |
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580 false /* not full gc*/); |
0 | 581 |
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582 size_policy->check_gc_overhead_limit(young_live, |
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583 eden_live, |
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584 max_old_gen_size, |
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585 max_eden_size, |
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586 false /* not full gc*/, |
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587 gc_cause, |
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588 heap->collector_policy()); |
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589 |
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590 size_policy->decay_supplemental_growth(false /* not full gc*/); |
0 | 591 } |
592 // Resize the young generation at every collection | |
593 // even if new sizes have not been calculated. This is | |
594 // to allow resizes that may have been inhibited by the | |
595 // relative location of the "to" and "from" spaces. | |
596 | |
597 // Resizing the old gen at minor collects can cause increases | |
598 // that don't feed back to the generation sizing policy until | |
599 // a major collection. Don't resize the old gen here. | |
600 | |
601 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
602 size_policy->calculated_survivor_size_in_bytes()); | |
603 | |
604 if (PrintAdaptiveSizePolicy) { | |
605 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
606 heap->total_collections()); | |
607 } | |
608 } | |
609 | |
610 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
611 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
612 // Also update() will case adaptive NUMA chunk resizing. | |
613 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
614 young_gen->eden_space()->update(); | |
615 | |
616 heap->gc_policy_counters()->update_counters(); | |
617 | |
618 heap->resize_all_tlabs(); | |
619 | |
620 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
621 } | |
622 | |
623 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
624 | |
625 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
626 | |
10405 | 627 { |
628 GCTraceTime tm("Prune Scavenge Root Methods", false, false, &_gc_timer); | |
629 | |
630 CodeCache::prune_scavenge_root_nmethods(); | |
631 } | |
4909 | 632 |
0 | 633 // Re-verify object start arrays |
634 if (VerifyObjectStartArray && | |
635 VerifyAfterGC) { | |
636 old_gen->verify_object_start_array(); | |
637 } | |
638 | |
639 // Verify all old -> young cards are now precise | |
640 if (VerifyRememberedSets) { | |
641 // Precise verification will give false positives. Until this is fixed, | |
642 // use imprecise verification. | |
643 // CardTableExtension::verify_all_young_refs_precise(); | |
644 CardTableExtension::verify_all_young_refs_imprecise(); | |
645 } | |
646 | |
647 if (TraceGen0Time) accumulated_time()->stop(); | |
648 | |
649 if (PrintGC) { | |
650 if (PrintGCDetails) { | |
651 // Don't print a GC timestamp here. This is after the GC so | |
652 // would be confusing. | |
653 young_gen->print_used_change(young_gen_used_before); | |
654 } | |
655 heap->print_heap_change(prev_used); | |
656 } | |
657 | |
658 // Track memory usage and detect low memory | |
659 MemoryService::track_memory_usage(); | |
660 heap->update_counters(); | |
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661 |
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662 gc_task_manager()->release_idle_workers(); |
0 | 663 } |
664 | |
665 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
666 HandleMark hm; // Discard invalid handles created during verification | |
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667 Universe::verify(" VerifyAfterGC:"); |
0 | 668 } |
669 | |
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670 heap->print_heap_after_gc(); |
10405 | 671 heap->trace_heap_after_gc(&_gc_tracer); |
672 _gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
0 | 673 |
263
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674 if (ZapUnusedHeapArea) { |
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675 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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676 young_gen->from_space()->check_mangled_unused_area_complete(); |
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677 young_gen->to_space()->check_mangled_unused_area_complete(); |
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678 } |
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679 |
0 | 680 scavenge_exit.update(); |
681 | |
682 if (PrintGCTaskTimeStamps) { | |
683 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
684 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
685 scavenge_exit.ticks()); | |
686 gc_task_manager()->print_task_time_stamps(); | |
687 } | |
688 | |
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689 #ifdef TRACESPINNING |
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690 ParallelTaskTerminator::print_termination_counts(); |
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691 #endif |
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692 |
10405 | 693 |
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694 _gc_timer.register_gc_end(); |
10405 | 695 |
696 _gc_tracer.report_gc_end(_gc_timer.gc_end(), _gc_timer.time_partitions()); | |
697 | |
0 | 698 return !promotion_failure_occurred; |
699 } | |
700 | |
701 // This method iterates over all objects in the young generation, | |
702 // unforwarding markOops. It then restores any preserved mark oops, | |
703 // and clears the _preserved_mark_stack. | |
704 void PSScavenge::clean_up_failed_promotion() { | |
705 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
706 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
707 | |
708 PSYoungGen* young_gen = heap->young_gen(); | |
709 | |
710 { | |
711 ResourceMark rm; | |
712 | |
713 // Unforward all pointers in the young gen. | |
714 PSPromotionFailedClosure unforward_closure; | |
715 young_gen->object_iterate(&unforward_closure); | |
716 | |
717 if (PrintGC && Verbose) { | |
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718 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 719 } |
720 | |
721 // Restore any saved marks. | |
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722 while (!_preserved_oop_stack.is_empty()) { |
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723 oop obj = _preserved_oop_stack.pop(); |
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724 markOop mark = _preserved_mark_stack.pop(); |
0 | 725 obj->set_mark(mark); |
726 } | |
727 | |
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728 // Clear the preserved mark and oop stack caches. |
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729 _preserved_mark_stack.clear(true); |
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730 _preserved_oop_stack.clear(true); |
0 | 731 } |
732 | |
733 // Reset the PromotionFailureALot counters. | |
734 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
735 } | |
736 | |
737 // This method is called whenever an attempt to promote an object | |
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738 // fails. Some markOops will need preservation, some will not. Note |
0 | 739 // that the entire eden is traversed after a failed promotion, with |
740 // all forwarded headers replaced by the default markOop. This means | |
10405 | 741 // it is not necessary to preserve most markOops. |
0 | 742 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { |
743 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { | |
10405 | 744 // Should use per-worker private stacks here rather than |
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745 // locking a common pair of stacks. |
0 | 746 ThreadCritical tc; |
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747 _preserved_oop_stack.push(obj); |
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748 _preserved_mark_stack.push(obj_mark); |
0 | 749 } |
750 } | |
751 | |
752 bool PSScavenge::should_attempt_scavenge() { | |
753 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
754 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
755 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
756 | |
757 if (UsePerfData) { | |
758 counters->update_scavenge_skipped(not_skipped); | |
759 } | |
760 | |
761 PSYoungGen* young_gen = heap->young_gen(); | |
762 PSOldGen* old_gen = heap->old_gen(); | |
763 | |
764 if (!ScavengeWithObjectsInToSpace) { | |
765 // Do not attempt to promote unless to_space is empty | |
766 if (!young_gen->to_space()->is_empty()) { | |
767 _consecutive_skipped_scavenges++; | |
768 if (UsePerfData) { | |
769 counters->update_scavenge_skipped(to_space_not_empty); | |
770 } | |
771 return false; | |
772 } | |
773 } | |
774 | |
775 // Test to see if the scavenge will likely fail. | |
776 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
777 | |
778 // A similar test is done in the policy's should_full_GC(). If this is | |
779 // changed, decide if that test should also be changed. | |
780 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
781 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
782 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
783 | |
784 if (PrintGCDetails && Verbose) { | |
785 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
786 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
787 " padded_average_promoted " SIZE_FORMAT | |
788 " free in old gen " SIZE_FORMAT, | |
789 (size_t) policy->average_promoted_in_bytes(), | |
790 (size_t) policy->padded_average_promoted_in_bytes(), | |
791 old_gen->free_in_bytes()); | |
792 if (young_gen->used_in_bytes() < | |
793 (size_t) policy->padded_average_promoted_in_bytes()) { | |
794 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
795 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
796 } | |
797 } | |
798 | |
799 if (result) { | |
800 _consecutive_skipped_scavenges = 0; | |
801 } else { | |
802 _consecutive_skipped_scavenges++; | |
803 if (UsePerfData) { | |
804 counters->update_scavenge_skipped(promoted_too_large); | |
805 } | |
806 } | |
807 return result; | |
808 } | |
809 | |
810 // Used to add tasks | |
811 GCTaskManager* const PSScavenge::gc_task_manager() { | |
812 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
813 "shouldn't return NULL"); | |
814 return ParallelScavengeHeap::gc_task_manager(); | |
815 } | |
816 | |
817 void PSScavenge::initialize() { | |
818 // Arguments must have been parsed | |
819 | |
820 if (AlwaysTenure) { | |
821 _tenuring_threshold = 0; | |
822 } else if (NeverTenure) { | |
823 _tenuring_threshold = markOopDesc::max_age + 1; | |
824 } else { | |
825 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
826 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
827 MaxTenuringThreshold; | |
828 } | |
829 | |
830 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
831 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
832 | |
833 PSYoungGen* young_gen = heap->young_gen(); | |
834 PSOldGen* old_gen = heap->old_gen(); | |
835 | |
836 // Set boundary between young_gen and old_gen | |
837 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
838 "old above young"); | |
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839 set_young_generation_boundary(young_gen->eden_space()->bottom()); |
0 | 840 |
841 // Initialize ref handling object for scavenging. | |
842 MemRegion mr = young_gen->reserved(); | |
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843 |
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844 _ref_processor = |
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845 new ReferenceProcessor(mr, // span |
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846 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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847 (int) ParallelGCThreads, // mt processing degree |
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848 true, // mt discovery |
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849 (int) ParallelGCThreads, // mt discovery degree |
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850 true, // atomic_discovery |
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851 NULL, // header provides liveness info |
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852 false); // next field updates do not need write barrier |
0 | 853 |
854 // Cache the cardtable | |
855 BarrierSet* bs = Universe::heap()->barrier_set(); | |
856 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
857 _card_table = (CardTableExtension*)bs; | |
858 | |
859 _counters = new CollectorCounters("PSScavenge", 0); | |
860 } |