Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2014, 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 |
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59 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
0 | 60 |
61 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
62 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
63 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
64 CardTableExtension* PSScavenge::_card_table = NULL; | |
65 bool PSScavenge::_survivor_overflow = false; | |
6818 | 66 uint PSScavenge::_tenuring_threshold = 0; |
0 | 67 HeapWord* PSScavenge::_young_generation_boundary = NULL; |
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68 uintptr_t PSScavenge::_young_generation_boundary_compressed = 0; |
0 | 69 elapsedTimer PSScavenge::_accumulated_time; |
10405 | 70 STWGCTimer PSScavenge::_gc_timer; |
71 ParallelScavengeTracer PSScavenge::_gc_tracer; | |
6197 | 72 Stack<markOop, mtGC> PSScavenge::_preserved_mark_stack; |
73 Stack<oop, mtGC> PSScavenge::_preserved_oop_stack; | |
0 | 74 CollectorCounters* PSScavenge::_counters = NULL; |
75 | |
76 // Define before use | |
77 class PSIsAliveClosure: public BoolObjectClosure { | |
78 public: | |
79 bool do_object_b(oop p) { | |
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80 return (!PSScavenge::is_obj_in_young(p)) || p->is_forwarded(); |
0 | 81 } |
82 }; | |
83 | |
84 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
85 | |
86 class PSKeepAliveClosure: public OopClosure { | |
87 protected: | |
88 MutableSpace* _to_space; | |
89 PSPromotionManager* _promotion_manager; | |
90 | |
91 public: | |
92 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
93 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
94 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
95 _to_space = heap->young_gen()->to_space(); | |
96 | |
97 assert(_promotion_manager != NULL, "Sanity"); | |
98 } | |
99 | |
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100 template <class T> void do_oop_work(T* p) { |
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101 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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102 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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103 "expected an oop while scanning weak refs"); |
0 | 104 |
105 // Weak refs may be visited more than once. | |
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106 if (PSScavenge::should_scavenge(p, _to_space)) { |
4909 | 107 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
0 | 108 } |
109 } | |
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110 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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111 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 112 }; |
113 | |
114 class PSEvacuateFollowersClosure: public VoidClosure { | |
115 private: | |
116 PSPromotionManager* _promotion_manager; | |
117 public: | |
118 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
119 | |
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120 virtual void do_void() { |
0 | 121 assert(_promotion_manager != NULL, "Sanity"); |
122 _promotion_manager->drain_stacks(true); | |
123 guarantee(_promotion_manager->stacks_empty(), | |
124 "stacks should be empty at this point"); | |
125 } | |
126 }; | |
127 | |
128 class PSPromotionFailedClosure : public ObjectClosure { | |
129 virtual void do_object(oop obj) { | |
130 if (obj->is_forwarded()) { | |
131 obj->init_mark(); | |
132 } | |
133 } | |
134 }; | |
135 | |
136 class PSRefProcTaskProxy: public GCTask { | |
137 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
138 ProcessTask & _rp_task; | |
139 uint _work_id; | |
140 public: | |
141 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
142 : _rp_task(rp_task), | |
143 _work_id(work_id) | |
144 { } | |
145 | |
146 private: | |
147 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
148 virtual void do_it(GCTaskManager* manager, uint which); | |
149 }; | |
150 | |
151 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
152 { | |
153 PSPromotionManager* promotion_manager = | |
154 PSPromotionManager::gc_thread_promotion_manager(which); | |
155 assert(promotion_manager != NULL, "sanity check"); | |
156 PSKeepAliveClosure keep_alive(promotion_manager); | |
157 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
158 PSIsAliveClosure is_alive; | |
159 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
160 } | |
161 | |
162 class PSRefEnqueueTaskProxy: public GCTask { | |
163 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
164 EnqueueTask& _enq_task; | |
165 uint _work_id; | |
166 | |
167 public: | |
168 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
169 : _enq_task(enq_task), | |
170 _work_id(work_id) | |
171 { } | |
172 | |
173 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
174 virtual void do_it(GCTaskManager* manager, uint which) | |
175 { | |
176 _enq_task.work(_work_id); | |
177 } | |
178 }; | |
179 | |
180 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
181 virtual void execute(ProcessTask& task); | |
182 virtual void execute(EnqueueTask& task); | |
183 }; | |
184 | |
185 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
186 { | |
187 GCTaskQueue* q = GCTaskQueue::create(); | |
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188 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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189 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 190 q->enqueue(new PSRefProcTaskProxy(task, i)); |
191 } | |
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192 ParallelTaskTerminator terminator(manager->active_workers(), |
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193 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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194 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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195 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 196 q->enqueue(new StealTask(&terminator)); |
197 } | |
198 } | |
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199 manager->execute_and_wait(q); |
0 | 200 } |
201 | |
202 | |
203 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
204 { | |
205 GCTaskQueue* q = GCTaskQueue::create(); | |
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206 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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207 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 208 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
209 } | |
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210 manager->execute_and_wait(q); |
0 | 211 } |
212 | |
213 // This method contains all heap specific policy for invoking scavenge. | |
214 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
215 // scavenge. It will not clean up after failed promotions, bail out if | |
216 // we've exceeded policy time limits, or any other special behavior. | |
217 // All such policy should be placed here. | |
218 // | |
219 // Note that this method should only be called from the vm_thread while | |
220 // at a safepoint! | |
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221 bool PSScavenge::invoke() { |
0 | 222 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
223 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
224 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
225 | |
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226 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
0 | 227 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
228 | |
229 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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230 IsGCActiveMark mark; |
0 | 231 |
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232 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
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233 const bool need_full_gc = !scavenge_done || |
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234 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
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235 bool full_gc_done = false; |
0 | 236 |
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237 if (UsePerfData) { |
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238 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
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239 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
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240 counters->update_full_follows_scavenge(ffs_val); |
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241 } |
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242 |
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243 if (need_full_gc) { |
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244 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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245 CollectorPolicy* cp = heap->collector_policy(); |
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246 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 247 |
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248 if (UseParallelOldGC) { |
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249 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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250 } else { |
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251 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 252 } |
253 } | |
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254 |
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255 return full_gc_done; |
0 | 256 } |
257 | |
258 // This method contains no policy. You should probably | |
259 // be calling invoke() instead. | |
260 bool PSScavenge::invoke_no_policy() { | |
261 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
262 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
263 | |
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264 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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265 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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266 |
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267 _gc_timer.register_gc_start(); |
10405 | 268 |
0 | 269 TimeStamp scavenge_entry; |
270 TimeStamp scavenge_midpoint; | |
271 TimeStamp scavenge_exit; | |
272 | |
273 scavenge_entry.update(); | |
274 | |
275 if (GC_locker::check_active_before_gc()) { | |
276 return false; | |
277 } | |
278 | |
279 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
280 GCCause::Cause gc_cause = heap->gc_cause(); | |
281 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
282 | |
283 // Check for potential problems. | |
284 if (!should_attempt_scavenge()) { | |
285 return false; | |
286 } | |
287 | |
10405 | 288 _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start()); |
289 | |
0 | 290 bool promotion_failure_occurred = false; |
291 | |
292 PSYoungGen* young_gen = heap->young_gen(); | |
293 PSOldGen* old_gen = heap->old_gen(); | |
294 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
10405 | 295 |
0 | 296 heap->increment_total_collections(); |
297 | |
298 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
299 | |
300 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
301 UseAdaptiveSizePolicyWithSystemGC) { | |
302 // Gather the feedback data for eden occupancy. | |
303 young_gen->eden_space()->accumulate_statistics(); | |
304 } | |
305 | |
263
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306 if (ZapUnusedHeapArea) { |
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307 // Save information needed to minimize mangling |
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308 heap->record_gen_tops_before_GC(); |
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309 } |
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310 |
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311 heap->print_heap_before_gc(); |
10405 | 312 heap->trace_heap_before_gc(&_gc_tracer); |
0 | 313 |
314 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
315 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
316 | |
317 size_t prev_used = heap->used(); | |
318 | |
319 // Fill in TLABs | |
320 heap->accumulate_statistics_all_tlabs(); | |
321 heap->ensure_parsability(true); // retire TLABs | |
322 | |
323 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
324 HandleMark hm; // Discard invalid handles created during verification | |
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325 Universe::verify(" VerifyBeforeGC:"); |
0 | 326 } |
327 | |
328 { | |
329 ResourceMark rm; | |
330 HandleMark hm; | |
331 | |
332 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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333 GCTraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, NULL, _gc_tracer.gc_id()); |
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 | |
22298 | 362 #if defined(COMPILER2) || INCLUDE_JVMCI |
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363 DerivedPointerTable::clear(); |
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364 #endif |
0 | 365 |
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366 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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367 reference_processor()->setup_policy(false); |
0 | 368 |
369 // We track how much was promoted to the next generation for | |
370 // the AdaptiveSizePolicy. | |
371 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
372 | |
373 // For PrintGCDetails | |
374 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
375 | |
376 // Reset our survivor overflow. | |
377 set_survivor_overflow(false); | |
378 | |
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379 // We need to save the old top values before |
0 | 380 // creating the promotion_manager. We pass the top |
381 // values to the card_table, to prevent it from | |
382 // straying into the promotion labs. | |
383 HeapWord* old_top = old_gen->object_space()->top(); | |
384 | |
385 // Release all previously held resources | |
386 gc_task_manager()->release_all_resources(); | |
387 | |
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388 // Set the number of GC threads to be used in this collection |
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389 gc_task_manager()->set_active_gang(); |
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390 gc_task_manager()->task_idle_workers(); |
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391 // Get the active number of workers here and use that value |
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392 // throughout the methods. |
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393 uint active_workers = gc_task_manager()->active_workers(); |
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394 heap->set_par_threads(active_workers); |
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395 |
0 | 396 PSPromotionManager::pre_scavenge(); |
397 | |
398 // We'll use the promotion manager again later. | |
399 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
400 { | |
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401 GCTraceTime tm("Scavenge", false, false, &_gc_timer, _gc_tracer.gc_id()); |
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402 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 403 |
404 GCTaskQueue* q = GCTaskQueue::create(); | |
405 | |
6817 | 406 if (!old_gen->object_space()->is_empty()) { |
407 // There are only old-to-young pointers if there are objects | |
408 // in the old gen. | |
409 uint stripe_total = active_workers; | |
410 for(uint i=0; i < stripe_total; i++) { | |
411 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); | |
412 } | |
0 | 413 } |
414 | |
415 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
416 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
417 // We scan the thread roots in parallel | |
418 Threads::create_thread_roots_tasks(q); | |
419 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
420 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
421 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
422 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
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423 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::class_loader_data)); |
0 | 424 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); |
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425 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 426 |
427 ParallelTaskTerminator terminator( | |
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428 active_workers, |
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429 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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430 if (active_workers > 1) { |
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431 for (uint j = 0; j < active_workers; j++) { |
0 | 432 q->enqueue(new StealTask(&terminator)); |
433 } | |
434 } | |
435 | |
436 gc_task_manager()->execute_and_wait(q); | |
437 } | |
438 | |
439 scavenge_midpoint.update(); | |
440 | |
441 // Process reference objects discovered during scavenge | |
442 { | |
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443 GCTraceTime tm("References", false, false, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 444 |
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445 reference_processor()->setup_policy(false); // not always_clear |
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446 reference_processor()->set_active_mt_degree(active_workers); |
0 | 447 PSKeepAliveClosure keep_alive(promotion_manager); |
448 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
10405 | 449 ReferenceProcessorStats stats; |
0 | 450 if (reference_processor()->processing_is_mt()) { |
451 PSRefProcTaskExecutor task_executor; | |
10405 | 452 stats = reference_processor()->process_discovered_references( |
453 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor, | |
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454 &_gc_timer, _gc_tracer.gc_id()); |
0 | 455 } else { |
10405 | 456 stats = reference_processor()->process_discovered_references( |
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457 &_is_alive_closure, &keep_alive, &evac_followers, NULL, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 458 } |
459 | |
460 _gc_tracer.report_gc_reference_stats(stats); | |
461 | |
462 // Enqueue reference objects discovered during scavenge. | |
463 if (reference_processor()->processing_is_mt()) { | |
464 PSRefProcTaskExecutor task_executor; | |
465 reference_processor()->enqueue_discovered_references(&task_executor); | |
466 } else { | |
467 reference_processor()->enqueue_discovered_references(NULL); | |
0 | 468 } |
469 } | |
470 | |
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471 { |
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472 GCTraceTime tm("StringTable", false, false, &_gc_timer, _gc_tracer.gc_id()); |
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473 // Unlink any dead interned Strings and process the remaining live ones. |
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474 PSScavengeRootsClosure root_closure(promotion_manager); |
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475 StringTable::unlink_or_oops_do(&_is_alive_closure, &root_closure); |
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476 } |
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477 |
0 | 478 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
10405 | 479 promotion_failure_occurred = PSPromotionManager::post_scavenge(_gc_tracer); |
0 | 480 if (promotion_failure_occurred) { |
481 clean_up_failed_promotion(); | |
482 if (PrintGC) { | |
483 gclog_or_tty->print("--"); | |
484 } | |
485 } | |
486 | |
487 // Let the size policy know we're done. Note that we count promotion | |
488 // failure cleanup time as part of the collection (otherwise, we're | |
489 // implicitly saying it's mutator time). | |
490 size_policy->minor_collection_end(gc_cause); | |
491 | |
492 if (!promotion_failure_occurred) { | |
493 // Swap the survivor spaces. | |
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494 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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495 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 496 young_gen->swap_spaces(); |
497 | |
498 size_t survived = young_gen->from_space()->used_in_bytes(); | |
499 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
500 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
501 | |
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502 // A successful scavenge should restart the GC time limit count which is |
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503 // for full GC's. |
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504 size_policy->reset_gc_overhead_limit_count(); |
0 | 505 if (UseAdaptiveSizePolicy) { |
506 // Calculate the new survivor size and tenuring threshold | |
507 | |
508 if (PrintAdaptiveSizePolicy) { | |
509 gclog_or_tty->print("AdaptiveSizeStart: "); | |
510 gclog_or_tty->stamp(); | |
511 gclog_or_tty->print_cr(" collection: %d ", | |
512 heap->total_collections()); | |
513 | |
514 if (Verbose) { | |
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515 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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516 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 517 } |
518 } | |
519 | |
520 | |
521 if (UsePerfData) { | |
522 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
523 counters->update_old_eden_size( | |
524 size_policy->calculated_eden_size_in_bytes()); | |
525 counters->update_old_promo_size( | |
526 size_policy->calculated_promo_size_in_bytes()); | |
527 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
528 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
529 counters->update_survived(survived); | |
530 counters->update_promoted(promoted); | |
531 counters->update_survivor_overflowed(_survivor_overflow); | |
532 } | |
533 | |
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534 size_t max_young_size = young_gen->max_size(); |
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535 |
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536 // Deciding a free ratio in the young generation is tricky, so if |
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537 // MinHeapFreeRatio or MaxHeapFreeRatio are in use (implicating |
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538 // that the old generation size may have been limited because of them) we |
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539 // should then limit our young generation size using NewRatio to have it |
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540 // follow the old generation size. |
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541 if (MinHeapFreeRatio != 0 || MaxHeapFreeRatio != 100) { |
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542 max_young_size = MIN2(old_gen->capacity_in_bytes() / NewRatio, young_gen->max_size()); |
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543 } |
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544 |
0 | 545 size_t survivor_limit = |
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546 size_policy->max_survivor_size(max_young_size); |
0 | 547 _tenuring_threshold = |
548 size_policy->compute_survivor_space_size_and_threshold( | |
549 _survivor_overflow, | |
550 _tenuring_threshold, | |
551 survivor_limit); | |
552 | |
553 if (PrintTenuringDistribution) { | |
554 gclog_or_tty->cr(); | |
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555 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
0 | 556 size_policy->calculated_survivor_size_in_bytes(), |
557 _tenuring_threshold, MaxTenuringThreshold); | |
558 } | |
559 | |
560 if (UsePerfData) { | |
561 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
562 counters->update_tenuring_threshold(_tenuring_threshold); | |
563 counters->update_survivor_size_counters(); | |
564 } | |
565 | |
566 // Do call at minor collections? | |
567 // Don't check if the size_policy is ready at this | |
568 // level. Let the size_policy check that internally. | |
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569 if (UseAdaptiveGenerationSizePolicyAtMinorCollection && |
0 | 570 ((gc_cause != GCCause::_java_lang_system_gc) || |
571 UseAdaptiveSizePolicyWithSystemGC)) { | |
572 | |
573 // Calculate optimial free space amounts | |
574 assert(young_gen->max_size() > | |
575 young_gen->from_space()->capacity_in_bytes() + | |
576 young_gen->to_space()->capacity_in_bytes(), | |
577 "Sizes of space in young gen are out-of-bounds"); | |
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578 |
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579 size_t young_live = young_gen->used_in_bytes(); |
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580 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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581 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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582 size_t max_old_gen_size = old_gen->max_gen_size(); |
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583 size_t max_eden_size = max_young_size - |
0 | 584 young_gen->from_space()->capacity_in_bytes() - |
585 young_gen->to_space()->capacity_in_bytes(); | |
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586 |
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587 // Used for diagnostics |
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588 size_policy->clear_generation_free_space_flags(); |
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589 |
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590 size_policy->compute_eden_space_size(young_live, |
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591 eden_live, |
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592 cur_eden, |
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593 max_eden_size, |
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594 false /* not full gc*/); |
0 | 595 |
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596 size_policy->check_gc_overhead_limit(young_live, |
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597 eden_live, |
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598 max_old_gen_size, |
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599 max_eden_size, |
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600 false /* not full gc*/, |
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601 gc_cause, |
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602 heap->collector_policy()); |
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603 |
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604 size_policy->decay_supplemental_growth(false /* not full gc*/); |
0 | 605 } |
606 // Resize the young generation at every collection | |
607 // even if new sizes have not been calculated. This is | |
608 // to allow resizes that may have been inhibited by the | |
609 // relative location of the "to" and "from" spaces. | |
610 | |
611 // Resizing the old gen at minor collects can cause increases | |
612 // that don't feed back to the generation sizing policy until | |
613 // a major collection. Don't resize the old gen here. | |
614 | |
615 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
616 size_policy->calculated_survivor_size_in_bytes()); | |
617 | |
618 if (PrintAdaptiveSizePolicy) { | |
619 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
620 heap->total_collections()); | |
621 } | |
622 } | |
623 | |
624 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
625 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
626 // Also update() will case adaptive NUMA chunk resizing. | |
627 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
628 young_gen->eden_space()->update(); | |
629 | |
630 heap->gc_policy_counters()->update_counters(); | |
631 | |
632 heap->resize_all_tlabs(); | |
633 | |
634 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
635 } | |
636 | |
22298 | 637 #if defined(COMPILER2) || INCLUDE_JVMCI |
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638 DerivedPointerTable::update_pointers(); |
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639 #endif |
0 | 640 |
641 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
642 | |
10405 | 643 { |
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644 GCTraceTime tm("Prune Scavenge Root Methods", false, false, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 645 |
646 CodeCache::prune_scavenge_root_nmethods(); | |
647 } | |
4909 | 648 |
0 | 649 // Re-verify object start arrays |
650 if (VerifyObjectStartArray && | |
651 VerifyAfterGC) { | |
652 old_gen->verify_object_start_array(); | |
653 } | |
654 | |
655 // Verify all old -> young cards are now precise | |
656 if (VerifyRememberedSets) { | |
657 // Precise verification will give false positives. Until this is fixed, | |
658 // use imprecise verification. | |
659 // CardTableExtension::verify_all_young_refs_precise(); | |
660 CardTableExtension::verify_all_young_refs_imprecise(); | |
661 } | |
662 | |
663 if (TraceGen0Time) accumulated_time()->stop(); | |
664 | |
665 if (PrintGC) { | |
666 if (PrintGCDetails) { | |
667 // Don't print a GC timestamp here. This is after the GC so | |
668 // would be confusing. | |
669 young_gen->print_used_change(young_gen_used_before); | |
670 } | |
671 heap->print_heap_change(prev_used); | |
672 } | |
673 | |
674 // Track memory usage and detect low memory | |
675 MemoryService::track_memory_usage(); | |
676 heap->update_counters(); | |
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677 |
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678 gc_task_manager()->release_idle_workers(); |
0 | 679 } |
680 | |
681 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
682 HandleMark hm; // Discard invalid handles created during verification | |
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683 Universe::verify(" VerifyAfterGC:"); |
0 | 684 } |
685 | |
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686 heap->print_heap_after_gc(); |
10405 | 687 heap->trace_heap_after_gc(&_gc_tracer); |
688 _gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
0 | 689 |
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690 if (ZapUnusedHeapArea) { |
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691 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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692 young_gen->from_space()->check_mangled_unused_area_complete(); |
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693 young_gen->to_space()->check_mangled_unused_area_complete(); |
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694 } |
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695 |
0 | 696 scavenge_exit.update(); |
697 | |
698 if (PrintGCTaskTimeStamps) { | |
699 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
700 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
701 scavenge_exit.ticks()); | |
702 gc_task_manager()->print_task_time_stamps(); | |
703 } | |
704 | |
546
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705 #ifdef TRACESPINNING |
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706 ParallelTaskTerminator::print_termination_counts(); |
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707 #endif |
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708 |
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710 _gc_timer.register_gc_end(); |
10405 | 711 |
712 _gc_tracer.report_gc_end(_gc_timer.gc_end(), _gc_timer.time_partitions()); | |
713 | |
0 | 714 return !promotion_failure_occurred; |
715 } | |
716 | |
717 // This method iterates over all objects in the young generation, | |
718 // unforwarding markOops. It then restores any preserved mark oops, | |
719 // and clears the _preserved_mark_stack. | |
720 void PSScavenge::clean_up_failed_promotion() { | |
721 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
722 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
723 | |
724 PSYoungGen* young_gen = heap->young_gen(); | |
725 | |
726 { | |
727 ResourceMark rm; | |
728 | |
729 // Unforward all pointers in the young gen. | |
730 PSPromotionFailedClosure unforward_closure; | |
731 young_gen->object_iterate(&unforward_closure); | |
732 | |
733 if (PrintGC && Verbose) { | |
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734 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 735 } |
736 | |
737 // Restore any saved marks. | |
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738 while (!_preserved_oop_stack.is_empty()) { |
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739 oop obj = _preserved_oop_stack.pop(); |
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740 markOop mark = _preserved_mark_stack.pop(); |
0 | 741 obj->set_mark(mark); |
742 } | |
743 | |
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744 // Clear the preserved mark and oop stack caches. |
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745 _preserved_mark_stack.clear(true); |
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746 _preserved_oop_stack.clear(true); |
0 | 747 } |
748 | |
749 // Reset the PromotionFailureALot counters. | |
750 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
751 } | |
752 | |
753 // This method is called whenever an attempt to promote an object | |
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754 // fails. Some markOops will need preservation, some will not. Note |
0 | 755 // that the entire eden is traversed after a failed promotion, with |
756 // all forwarded headers replaced by the default markOop. This means | |
10405 | 757 // it is not necessary to preserve most markOops. |
0 | 758 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { |
759 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { | |
10405 | 760 // Should use per-worker private stacks here rather than |
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761 // locking a common pair of stacks. |
0 | 762 ThreadCritical tc; |
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763 _preserved_oop_stack.push(obj); |
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764 _preserved_mark_stack.push(obj_mark); |
0 | 765 } |
766 } | |
767 | |
768 bool PSScavenge::should_attempt_scavenge() { | |
769 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
770 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
771 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
772 | |
773 if (UsePerfData) { | |
774 counters->update_scavenge_skipped(not_skipped); | |
775 } | |
776 | |
777 PSYoungGen* young_gen = heap->young_gen(); | |
778 PSOldGen* old_gen = heap->old_gen(); | |
779 | |
780 if (!ScavengeWithObjectsInToSpace) { | |
781 // Do not attempt to promote unless to_space is empty | |
782 if (!young_gen->to_space()->is_empty()) { | |
783 _consecutive_skipped_scavenges++; | |
784 if (UsePerfData) { | |
785 counters->update_scavenge_skipped(to_space_not_empty); | |
786 } | |
787 return false; | |
788 } | |
789 } | |
790 | |
791 // Test to see if the scavenge will likely fail. | |
792 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
793 | |
794 // A similar test is done in the policy's should_full_GC(). If this is | |
795 // changed, decide if that test should also be changed. | |
796 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
797 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
798 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
799 | |
800 if (PrintGCDetails && Verbose) { | |
801 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
802 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
803 " padded_average_promoted " SIZE_FORMAT | |
804 " free in old gen " SIZE_FORMAT, | |
805 (size_t) policy->average_promoted_in_bytes(), | |
806 (size_t) policy->padded_average_promoted_in_bytes(), | |
807 old_gen->free_in_bytes()); | |
808 if (young_gen->used_in_bytes() < | |
809 (size_t) policy->padded_average_promoted_in_bytes()) { | |
810 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
811 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
812 } | |
813 } | |
814 | |
815 if (result) { | |
816 _consecutive_skipped_scavenges = 0; | |
817 } else { | |
818 _consecutive_skipped_scavenges++; | |
819 if (UsePerfData) { | |
820 counters->update_scavenge_skipped(promoted_too_large); | |
821 } | |
822 } | |
823 return result; | |
824 } | |
825 | |
826 // Used to add tasks | |
827 GCTaskManager* const PSScavenge::gc_task_manager() { | |
828 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
829 "shouldn't return NULL"); | |
830 return ParallelScavengeHeap::gc_task_manager(); | |
831 } | |
832 | |
833 void PSScavenge::initialize() { | |
834 // Arguments must have been parsed | |
835 | |
836 if (AlwaysTenure) { | |
837 _tenuring_threshold = 0; | |
838 } else if (NeverTenure) { | |
839 _tenuring_threshold = markOopDesc::max_age + 1; | |
840 } else { | |
841 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
842 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
843 MaxTenuringThreshold; | |
844 } | |
845 | |
846 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
847 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
848 | |
849 PSYoungGen* young_gen = heap->young_gen(); | |
850 PSOldGen* old_gen = heap->old_gen(); | |
851 | |
852 // Set boundary between young_gen and old_gen | |
853 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
854 "old above young"); | |
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855 set_young_generation_boundary(young_gen->eden_space()->bottom()); |
0 | 856 |
857 // Initialize ref handling object for scavenging. | |
858 MemRegion mr = young_gen->reserved(); | |
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859 |
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860 _ref_processor = |
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861 new ReferenceProcessor(mr, // span |
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862 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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863 (int) ParallelGCThreads, // mt processing degree |
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864 true, // mt discovery |
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865 (int) ParallelGCThreads, // mt discovery degree |
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866 true, // atomic_discovery |
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867 NULL); // header provides liveness info |
0 | 868 |
869 // Cache the cardtable | |
870 BarrierSet* bs = Universe::heap()->barrier_set(); | |
871 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
872 _card_table = (CardTableExtension*)bs; | |
873 | |
874 _counters = new CollectorCounters("PSScavenge", 0); | |
875 } |