Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | 7848fc12602b |
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rev | line source |
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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 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
333 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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334 GCTraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, NULL, _gc_tracer.gc_id()); |
0 | 335 TraceCollectorStats tcs(counters()); |
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336 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 337 |
338 if (TraceGen0Time) accumulated_time()->start(); | |
339 | |
340 // Let the size policy know we're starting | |
341 size_policy->minor_collection_begin(); | |
342 | |
343 // Verify the object start arrays. | |
344 if (VerifyObjectStartArray && | |
345 VerifyBeforeGC) { | |
346 old_gen->verify_object_start_array(); | |
347 } | |
348 | |
349 // Verify no unmarked old->young roots | |
350 if (VerifyRememberedSets) { | |
351 CardTableExtension::verify_all_young_refs_imprecise(); | |
352 } | |
353 | |
354 if (!ScavengeWithObjectsInToSpace) { | |
355 assert(young_gen->to_space()->is_empty(), | |
356 "Attempt to scavenge with live objects in to_space"); | |
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357 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 358 } else if (ZapUnusedHeapArea) { |
359 young_gen->to_space()->mangle_unused_area(); | |
360 } | |
361 save_to_space_top_before_gc(); | |
362 | |
363 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
364 | |
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365 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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366 reference_processor()->setup_policy(false); |
0 | 367 |
368 // We track how much was promoted to the next generation for | |
369 // the AdaptiveSizePolicy. | |
370 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
371 | |
372 // For PrintGCDetails | |
373 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
374 | |
375 // Reset our survivor overflow. | |
376 set_survivor_overflow(false); | |
377 | |
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378 // We need to save the old top values before |
0 | 379 // creating the promotion_manager. We pass the top |
380 // values to the card_table, to prevent it from | |
381 // straying into the promotion labs. | |
382 HeapWord* old_top = old_gen->object_space()->top(); | |
383 | |
384 // Release all previously held resources | |
385 gc_task_manager()->release_all_resources(); | |
386 | |
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387 // Set the number of GC threads to be used in this collection |
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388 gc_task_manager()->set_active_gang(); |
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389 gc_task_manager()->task_idle_workers(); |
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390 // Get the active number of workers here and use that value |
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391 // throughout the methods. |
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392 uint active_workers = gc_task_manager()->active_workers(); |
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393 heap->set_par_threads(active_workers); |
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394 |
0 | 395 PSPromotionManager::pre_scavenge(); |
396 | |
397 // We'll use the promotion manager again later. | |
398 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
399 { | |
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400 GCTraceTime tm("Scavenge", false, false, &_gc_timer, _gc_tracer.gc_id()); |
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401 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 402 |
403 GCTaskQueue* q = GCTaskQueue::create(); | |
404 | |
6817 | 405 if (!old_gen->object_space()->is_empty()) { |
406 // There are only old-to-young pointers if there are objects | |
407 // in the old gen. | |
408 uint stripe_total = active_workers; | |
409 for(uint i=0; i < stripe_total; i++) { | |
410 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); | |
411 } | |
0 | 412 } |
413 | |
414 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
415 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
416 // We scan the thread roots in parallel | |
417 Threads::create_thread_roots_tasks(q); | |
418 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
419 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
420 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
421 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
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422 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::class_loader_data)); |
0 | 423 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); |
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424 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 425 |
426 ParallelTaskTerminator terminator( | |
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427 active_workers, |
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428 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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429 if (active_workers > 1) { |
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430 for (uint j = 0; j < active_workers; j++) { |
0 | 431 q->enqueue(new StealTask(&terminator)); |
432 } | |
433 } | |
434 | |
435 gc_task_manager()->execute_and_wait(q); | |
436 } | |
437 | |
438 scavenge_midpoint.update(); | |
439 | |
440 // Process reference objects discovered during scavenge | |
441 { | |
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442 GCTraceTime tm("References", false, false, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 443 |
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444 reference_processor()->setup_policy(false); // not always_clear |
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445 reference_processor()->set_active_mt_degree(active_workers); |
0 | 446 PSKeepAliveClosure keep_alive(promotion_manager); |
447 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
10405 | 448 ReferenceProcessorStats stats; |
0 | 449 if (reference_processor()->processing_is_mt()) { |
450 PSRefProcTaskExecutor task_executor; | |
10405 | 451 stats = reference_processor()->process_discovered_references( |
452 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor, | |
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453 &_gc_timer, _gc_tracer.gc_id()); |
0 | 454 } else { |
10405 | 455 stats = reference_processor()->process_discovered_references( |
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456 &_is_alive_closure, &keep_alive, &evac_followers, NULL, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 457 } |
458 | |
459 _gc_tracer.report_gc_reference_stats(stats); | |
460 | |
461 // Enqueue reference objects discovered during scavenge. | |
462 if (reference_processor()->processing_is_mt()) { | |
463 PSRefProcTaskExecutor task_executor; | |
464 reference_processor()->enqueue_discovered_references(&task_executor); | |
465 } else { | |
466 reference_processor()->enqueue_discovered_references(NULL); | |
0 | 467 } |
468 } | |
469 | |
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470 { |
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471 GCTraceTime tm("StringTable", false, false, &_gc_timer, _gc_tracer.gc_id()); |
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472 // Unlink any dead interned Strings and process the remaining live ones. |
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473 PSScavengeRootsClosure root_closure(promotion_manager); |
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474 StringTable::unlink_or_oops_do(&_is_alive_closure, &root_closure); |
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475 } |
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476 |
0 | 477 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
10405 | 478 promotion_failure_occurred = PSPromotionManager::post_scavenge(_gc_tracer); |
0 | 479 if (promotion_failure_occurred) { |
480 clean_up_failed_promotion(); | |
481 if (PrintGC) { | |
482 gclog_or_tty->print("--"); | |
483 } | |
484 } | |
485 | |
486 // Let the size policy know we're done. Note that we count promotion | |
487 // failure cleanup time as part of the collection (otherwise, we're | |
488 // implicitly saying it's mutator time). | |
489 size_policy->minor_collection_end(gc_cause); | |
490 | |
491 if (!promotion_failure_occurred) { | |
492 // Swap the survivor spaces. | |
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493 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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494 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 495 young_gen->swap_spaces(); |
496 | |
497 size_t survived = young_gen->from_space()->used_in_bytes(); | |
498 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
499 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
500 | |
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501 // A successful scavenge should restart the GC time limit count which is |
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502 // for full GC's. |
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503 size_policy->reset_gc_overhead_limit_count(); |
0 | 504 if (UseAdaptiveSizePolicy) { |
505 // Calculate the new survivor size and tenuring threshold | |
506 | |
507 if (PrintAdaptiveSizePolicy) { | |
508 gclog_or_tty->print("AdaptiveSizeStart: "); | |
509 gclog_or_tty->stamp(); | |
510 gclog_or_tty->print_cr(" collection: %d ", | |
511 heap->total_collections()); | |
512 | |
513 if (Verbose) { | |
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514 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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515 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 516 } |
517 } | |
518 | |
519 | |
520 if (UsePerfData) { | |
521 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
522 counters->update_old_eden_size( | |
523 size_policy->calculated_eden_size_in_bytes()); | |
524 counters->update_old_promo_size( | |
525 size_policy->calculated_promo_size_in_bytes()); | |
526 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
527 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
528 counters->update_survived(survived); | |
529 counters->update_promoted(promoted); | |
530 counters->update_survivor_overflowed(_survivor_overflow); | |
531 } | |
532 | |
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533 size_t max_young_size = young_gen->max_size(); |
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534 |
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535 // Deciding a free ratio in the young generation is tricky, so if |
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536 // MinHeapFreeRatio or MaxHeapFreeRatio are in use (implicating |
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537 // that the old generation size may have been limited because of them) we |
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538 // should then limit our young generation size using NewRatio to have it |
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539 // follow the old generation size. |
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540 if (MinHeapFreeRatio != 0 || MaxHeapFreeRatio != 100) { |
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541 max_young_size = MIN2(old_gen->capacity_in_bytes() / NewRatio, young_gen->max_size()); |
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542 } |
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543 |
0 | 544 size_t survivor_limit = |
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545 size_policy->max_survivor_size(max_young_size); |
0 | 546 _tenuring_threshold = |
547 size_policy->compute_survivor_space_size_and_threshold( | |
548 _survivor_overflow, | |
549 _tenuring_threshold, | |
550 survivor_limit); | |
551 | |
552 if (PrintTenuringDistribution) { | |
553 gclog_or_tty->cr(); | |
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554 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
0 | 555 size_policy->calculated_survivor_size_in_bytes(), |
556 _tenuring_threshold, MaxTenuringThreshold); | |
557 } | |
558 | |
559 if (UsePerfData) { | |
560 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
561 counters->update_tenuring_threshold(_tenuring_threshold); | |
562 counters->update_survivor_size_counters(); | |
563 } | |
564 | |
565 // Do call at minor collections? | |
566 // Don't check if the size_policy is ready at this | |
567 // level. Let the size_policy check that internally. | |
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568 if (UseAdaptiveGenerationSizePolicyAtMinorCollection && |
0 | 569 ((gc_cause != GCCause::_java_lang_system_gc) || |
570 UseAdaptiveSizePolicyWithSystemGC)) { | |
571 | |
572 // Calculate optimial free space amounts | |
573 assert(young_gen->max_size() > | |
574 young_gen->from_space()->capacity_in_bytes() + | |
575 young_gen->to_space()->capacity_in_bytes(), | |
576 "Sizes of space in young gen are out-of-bounds"); | |
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577 |
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578 size_t young_live = young_gen->used_in_bytes(); |
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579 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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580 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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581 size_t max_old_gen_size = old_gen->max_gen_size(); |
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582 size_t max_eden_size = max_young_size - |
0 | 583 young_gen->from_space()->capacity_in_bytes() - |
584 young_gen->to_space()->capacity_in_bytes(); | |
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585 |
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586 // Used for diagnostics |
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587 size_policy->clear_generation_free_space_flags(); |
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588 |
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589 size_policy->compute_eden_space_size(young_live, |
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590 eden_live, |
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591 cur_eden, |
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592 max_eden_size, |
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593 false /* not full gc*/); |
0 | 594 |
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595 size_policy->check_gc_overhead_limit(young_live, |
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596 eden_live, |
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597 max_old_gen_size, |
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598 max_eden_size, |
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599 false /* not full gc*/, |
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600 gc_cause, |
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601 heap->collector_policy()); |
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602 |
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603 size_policy->decay_supplemental_growth(false /* not full gc*/); |
0 | 604 } |
605 // Resize the young generation at every collection | |
606 // even if new sizes have not been calculated. This is | |
607 // to allow resizes that may have been inhibited by the | |
608 // relative location of the "to" and "from" spaces. | |
609 | |
610 // Resizing the old gen at minor collects can cause increases | |
611 // that don't feed back to the generation sizing policy until | |
612 // a major collection. Don't resize the old gen here. | |
613 | |
614 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
615 size_policy->calculated_survivor_size_in_bytes()); | |
616 | |
617 if (PrintAdaptiveSizePolicy) { | |
618 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
619 heap->total_collections()); | |
620 } | |
621 } | |
622 | |
623 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
624 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
625 // Also update() will case adaptive NUMA chunk resizing. | |
626 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
627 young_gen->eden_space()->update(); | |
628 | |
629 heap->gc_policy_counters()->update_counters(); | |
630 | |
631 heap->resize_all_tlabs(); | |
632 | |
633 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
634 } | |
635 | |
636 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
637 | |
638 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
639 | |
10405 | 640 { |
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641 GCTraceTime tm("Prune Scavenge Root Methods", false, false, &_gc_timer, _gc_tracer.gc_id()); |
10405 | 642 |
643 CodeCache::prune_scavenge_root_nmethods(); | |
644 } | |
4909 | 645 |
0 | 646 // Re-verify object start arrays |
647 if (VerifyObjectStartArray && | |
648 VerifyAfterGC) { | |
649 old_gen->verify_object_start_array(); | |
650 } | |
651 | |
652 // Verify all old -> young cards are now precise | |
653 if (VerifyRememberedSets) { | |
654 // Precise verification will give false positives. Until this is fixed, | |
655 // use imprecise verification. | |
656 // CardTableExtension::verify_all_young_refs_precise(); | |
657 CardTableExtension::verify_all_young_refs_imprecise(); | |
658 } | |
659 | |
660 if (TraceGen0Time) accumulated_time()->stop(); | |
661 | |
662 if (PrintGC) { | |
663 if (PrintGCDetails) { | |
664 // Don't print a GC timestamp here. This is after the GC so | |
665 // would be confusing. | |
666 young_gen->print_used_change(young_gen_used_before); | |
667 } | |
668 heap->print_heap_change(prev_used); | |
669 } | |
670 | |
671 // Track memory usage and detect low memory | |
672 MemoryService::track_memory_usage(); | |
673 heap->update_counters(); | |
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674 |
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675 gc_task_manager()->release_idle_workers(); |
0 | 676 } |
677 | |
678 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
679 HandleMark hm; // Discard invalid handles created during verification | |
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680 Universe::verify(" VerifyAfterGC:"); |
0 | 681 } |
682 | |
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683 heap->print_heap_after_gc(); |
10405 | 684 heap->trace_heap_after_gc(&_gc_tracer); |
685 _gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
0 | 686 |
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687 if (ZapUnusedHeapArea) { |
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688 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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689 young_gen->from_space()->check_mangled_unused_area_complete(); |
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690 young_gen->to_space()->check_mangled_unused_area_complete(); |
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691 } |
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692 |
0 | 693 scavenge_exit.update(); |
694 | |
695 if (PrintGCTaskTimeStamps) { | |
696 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
697 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
698 scavenge_exit.ticks()); | |
699 gc_task_manager()->print_task_time_stamps(); | |
700 } | |
701 | |
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702 #ifdef TRACESPINNING |
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703 ParallelTaskTerminator::print_termination_counts(); |
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704 #endif |
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705 |
10405 | 706 |
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707 _gc_timer.register_gc_end(); |
10405 | 708 |
709 _gc_tracer.report_gc_end(_gc_timer.gc_end(), _gc_timer.time_partitions()); | |
710 | |
0 | 711 return !promotion_failure_occurred; |
712 } | |
713 | |
714 // This method iterates over all objects in the young generation, | |
715 // unforwarding markOops. It then restores any preserved mark oops, | |
716 // and clears the _preserved_mark_stack. | |
717 void PSScavenge::clean_up_failed_promotion() { | |
718 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
719 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
720 | |
721 PSYoungGen* young_gen = heap->young_gen(); | |
722 | |
723 { | |
724 ResourceMark rm; | |
725 | |
726 // Unforward all pointers in the young gen. | |
727 PSPromotionFailedClosure unforward_closure; | |
728 young_gen->object_iterate(&unforward_closure); | |
729 | |
730 if (PrintGC && Verbose) { | |
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731 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 732 } |
733 | |
734 // Restore any saved marks. | |
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735 while (!_preserved_oop_stack.is_empty()) { |
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736 oop obj = _preserved_oop_stack.pop(); |
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737 markOop mark = _preserved_mark_stack.pop(); |
0 | 738 obj->set_mark(mark); |
739 } | |
740 | |
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741 // Clear the preserved mark and oop stack caches. |
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742 _preserved_mark_stack.clear(true); |
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743 _preserved_oop_stack.clear(true); |
0 | 744 } |
745 | |
746 // Reset the PromotionFailureALot counters. | |
747 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
748 } | |
749 | |
750 // This method is called whenever an attempt to promote an object | |
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751 // fails. Some markOops will need preservation, some will not. Note |
0 | 752 // that the entire eden is traversed after a failed promotion, with |
753 // all forwarded headers replaced by the default markOop. This means | |
10405 | 754 // it is not necessary to preserve most markOops. |
0 | 755 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { |
756 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { | |
10405 | 757 // Should use per-worker private stacks here rather than |
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758 // locking a common pair of stacks. |
0 | 759 ThreadCritical tc; |
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760 _preserved_oop_stack.push(obj); |
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761 _preserved_mark_stack.push(obj_mark); |
0 | 762 } |
763 } | |
764 | |
765 bool PSScavenge::should_attempt_scavenge() { | |
766 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
767 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
768 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
769 | |
770 if (UsePerfData) { | |
771 counters->update_scavenge_skipped(not_skipped); | |
772 } | |
773 | |
774 PSYoungGen* young_gen = heap->young_gen(); | |
775 PSOldGen* old_gen = heap->old_gen(); | |
776 | |
777 if (!ScavengeWithObjectsInToSpace) { | |
778 // Do not attempt to promote unless to_space is empty | |
779 if (!young_gen->to_space()->is_empty()) { | |
780 _consecutive_skipped_scavenges++; | |
781 if (UsePerfData) { | |
782 counters->update_scavenge_skipped(to_space_not_empty); | |
783 } | |
784 return false; | |
785 } | |
786 } | |
787 | |
788 // Test to see if the scavenge will likely fail. | |
789 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
790 | |
791 // A similar test is done in the policy's should_full_GC(). If this is | |
792 // changed, decide if that test should also be changed. | |
793 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
794 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
795 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
796 | |
797 if (PrintGCDetails && Verbose) { | |
798 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
799 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
800 " padded_average_promoted " SIZE_FORMAT | |
801 " free in old gen " SIZE_FORMAT, | |
802 (size_t) policy->average_promoted_in_bytes(), | |
803 (size_t) policy->padded_average_promoted_in_bytes(), | |
804 old_gen->free_in_bytes()); | |
805 if (young_gen->used_in_bytes() < | |
806 (size_t) policy->padded_average_promoted_in_bytes()) { | |
807 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
808 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
809 } | |
810 } | |
811 | |
812 if (result) { | |
813 _consecutive_skipped_scavenges = 0; | |
814 } else { | |
815 _consecutive_skipped_scavenges++; | |
816 if (UsePerfData) { | |
817 counters->update_scavenge_skipped(promoted_too_large); | |
818 } | |
819 } | |
820 return result; | |
821 } | |
822 | |
823 // Used to add tasks | |
824 GCTaskManager* const PSScavenge::gc_task_manager() { | |
825 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
826 "shouldn't return NULL"); | |
827 return ParallelScavengeHeap::gc_task_manager(); | |
828 } | |
829 | |
830 void PSScavenge::initialize() { | |
831 // Arguments must have been parsed | |
832 | |
833 if (AlwaysTenure) { | |
834 _tenuring_threshold = 0; | |
835 } else if (NeverTenure) { | |
836 _tenuring_threshold = markOopDesc::max_age + 1; | |
837 } else { | |
838 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
839 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
840 MaxTenuringThreshold; | |
841 } | |
842 | |
843 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
844 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
845 | |
846 PSYoungGen* young_gen = heap->young_gen(); | |
847 PSOldGen* old_gen = heap->old_gen(); | |
848 | |
849 // Set boundary between young_gen and old_gen | |
850 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
851 "old above young"); | |
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852 set_young_generation_boundary(young_gen->eden_space()->bottom()); |
0 | 853 |
854 // Initialize ref handling object for scavenging. | |
855 MemRegion mr = young_gen->reserved(); | |
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856 |
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857 _ref_processor = |
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858 new ReferenceProcessor(mr, // span |
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859 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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860 (int) ParallelGCThreads, // mt processing degree |
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861 true, // mt discovery |
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862 (int) ParallelGCThreads, // mt discovery degree |
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863 true, // atomic_discovery |
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864 NULL); // header provides liveness info |
0 | 865 |
866 // Cache the cardtable | |
867 BarrierSet* bs = Universe::heap()->barrier_set(); | |
868 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
869 _card_table = (CardTableExtension*)bs; | |
870 | |
871 _counters = new CollectorCounters("PSScavenge", 0); | |
872 } |