Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 10370:47bdfb3d010f
8015486: PSScavenge::is_obj_in_young is unnecessarily slow with UseCompressedOops
Summary: Compare compressed oops to a compressed young gen boundary instead of uncompressing the oops before doing the young gen boundary check.
Reviewed-by: brutisso, jmasa
author | stefank |
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date | Thu, 30 May 2013 10:58:16 +0200 |
parents | 8dbc025ff709 |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
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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/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
36 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
38 #include "gc_implementation/shared/spaceDecorator.hpp" | |
39 #include "gc_interface/gcCause.hpp" | |
40 #include "memory/collectorPolicy.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "memory/resourceArea.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "oops/oop.psgc.inline.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/threadCritical.hpp" | |
51 #include "runtime/vmThread.hpp" | |
52 #include "runtime/vm_operations.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/stack.inline.hpp" | |
0 | 55 |
56 | |
57 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
58 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
59 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
60 CardTableExtension* PSScavenge::_card_table = NULL; | |
61 bool PSScavenge::_survivor_overflow = false; | |
6818 | 62 uint PSScavenge::_tenuring_threshold = 0; |
0 | 63 HeapWord* PSScavenge::_young_generation_boundary = NULL; |
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64 uintptr_t PSScavenge::_young_generation_boundary_compressed = 0; |
0 | 65 elapsedTimer PSScavenge::_accumulated_time; |
6197 | 66 Stack<markOop, mtGC> PSScavenge::_preserved_mark_stack; |
67 Stack<oop, mtGC> PSScavenge::_preserved_oop_stack; | |
0 | 68 CollectorCounters* PSScavenge::_counters = NULL; |
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69 bool PSScavenge::_promotion_failed = false; |
0 | 70 |
71 // Define before use | |
72 class PSIsAliveClosure: public BoolObjectClosure { | |
73 public: | |
74 bool do_object_b(oop p) { | |
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75 return (!PSScavenge::is_obj_in_young(p)) || p->is_forwarded(); |
0 | 76 } |
77 }; | |
78 | |
79 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
80 | |
81 class PSKeepAliveClosure: public OopClosure { | |
82 protected: | |
83 MutableSpace* _to_space; | |
84 PSPromotionManager* _promotion_manager; | |
85 | |
86 public: | |
87 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
88 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
89 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
90 _to_space = heap->young_gen()->to_space(); | |
91 | |
92 assert(_promotion_manager != NULL, "Sanity"); | |
93 } | |
94 | |
113
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95 template <class T> void do_oop_work(T* p) { |
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96 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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97 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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98 "expected an oop while scanning weak refs"); |
0 | 99 |
100 // Weak refs may be visited more than once. | |
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101 if (PSScavenge::should_scavenge(p, _to_space)) { |
4909 | 102 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
0 | 103 } |
104 } | |
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105 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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106 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 107 }; |
108 | |
109 class PSEvacuateFollowersClosure: public VoidClosure { | |
110 private: | |
111 PSPromotionManager* _promotion_manager; | |
112 public: | |
113 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
114 | |
113
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115 virtual void do_void() { |
0 | 116 assert(_promotion_manager != NULL, "Sanity"); |
117 _promotion_manager->drain_stacks(true); | |
118 guarantee(_promotion_manager->stacks_empty(), | |
119 "stacks should be empty at this point"); | |
120 } | |
121 }; | |
122 | |
123 class PSPromotionFailedClosure : public ObjectClosure { | |
124 virtual void do_object(oop obj) { | |
125 if (obj->is_forwarded()) { | |
126 obj->init_mark(); | |
127 } | |
128 } | |
129 }; | |
130 | |
131 class PSRefProcTaskProxy: public GCTask { | |
132 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
133 ProcessTask & _rp_task; | |
134 uint _work_id; | |
135 public: | |
136 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
137 : _rp_task(rp_task), | |
138 _work_id(work_id) | |
139 { } | |
140 | |
141 private: | |
142 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
143 virtual void do_it(GCTaskManager* manager, uint which); | |
144 }; | |
145 | |
146 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
147 { | |
148 PSPromotionManager* promotion_manager = | |
149 PSPromotionManager::gc_thread_promotion_manager(which); | |
150 assert(promotion_manager != NULL, "sanity check"); | |
151 PSKeepAliveClosure keep_alive(promotion_manager); | |
152 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
153 PSIsAliveClosure is_alive; | |
154 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
155 } | |
156 | |
157 class PSRefEnqueueTaskProxy: public GCTask { | |
158 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
159 EnqueueTask& _enq_task; | |
160 uint _work_id; | |
161 | |
162 public: | |
163 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
164 : _enq_task(enq_task), | |
165 _work_id(work_id) | |
166 { } | |
167 | |
168 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
169 virtual void do_it(GCTaskManager* manager, uint which) | |
170 { | |
171 _enq_task.work(_work_id); | |
172 } | |
173 }; | |
174 | |
175 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
176 virtual void execute(ProcessTask& task); | |
177 virtual void execute(EnqueueTask& task); | |
178 }; | |
179 | |
180 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
181 { | |
182 GCTaskQueue* q = GCTaskQueue::create(); | |
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183 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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184 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 185 q->enqueue(new PSRefProcTaskProxy(task, i)); |
186 } | |
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187 ParallelTaskTerminator terminator(manager->active_workers(), |
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188 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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189 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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190 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 191 q->enqueue(new StealTask(&terminator)); |
192 } | |
193 } | |
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194 manager->execute_and_wait(q); |
0 | 195 } |
196 | |
197 | |
198 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
199 { | |
200 GCTaskQueue* q = GCTaskQueue::create(); | |
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201 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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202 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 203 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
204 } | |
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205 manager->execute_and_wait(q); |
0 | 206 } |
207 | |
208 // This method contains all heap specific policy for invoking scavenge. | |
209 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
210 // scavenge. It will not clean up after failed promotions, bail out if | |
211 // we've exceeded policy time limits, or any other special behavior. | |
212 // All such policy should be placed here. | |
213 // | |
214 // Note that this method should only be called from the vm_thread while | |
215 // at a safepoint! | |
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216 bool PSScavenge::invoke() { |
0 | 217 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
218 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
219 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
220 | |
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221 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
0 | 222 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
223 | |
224 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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225 IsGCActiveMark mark; |
0 | 226 |
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227 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
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228 const bool need_full_gc = !scavenge_done || |
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229 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
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230 bool full_gc_done = false; |
0 | 231 |
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232 if (UsePerfData) { |
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233 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
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234 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
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235 counters->update_full_follows_scavenge(ffs_val); |
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236 } |
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237 |
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238 if (need_full_gc) { |
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239 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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240 CollectorPolicy* cp = heap->collector_policy(); |
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241 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 242 |
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243 if (UseParallelOldGC) { |
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244 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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245 } else { |
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246 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 247 } |
248 } | |
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249 |
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250 return full_gc_done; |
0 | 251 } |
252 | |
253 // This method contains no policy. You should probably | |
254 // be calling invoke() instead. | |
255 bool PSScavenge::invoke_no_policy() { | |
256 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
257 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
258 | |
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259 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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260 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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261 |
0 | 262 TimeStamp scavenge_entry; |
263 TimeStamp scavenge_midpoint; | |
264 TimeStamp scavenge_exit; | |
265 | |
266 scavenge_entry.update(); | |
267 | |
268 if (GC_locker::check_active_before_gc()) { | |
269 return false; | |
270 } | |
271 | |
272 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
273 GCCause::Cause gc_cause = heap->gc_cause(); | |
274 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
275 | |
276 // Check for potential problems. | |
277 if (!should_attempt_scavenge()) { | |
278 return false; | |
279 } | |
280 | |
281 bool promotion_failure_occurred = false; | |
282 | |
283 PSYoungGen* young_gen = heap->young_gen(); | |
284 PSOldGen* old_gen = heap->old_gen(); | |
285 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
286 heap->increment_total_collections(); | |
287 | |
288 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
289 | |
290 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
291 UseAdaptiveSizePolicyWithSystemGC) { | |
292 // Gather the feedback data for eden occupancy. | |
293 young_gen->eden_space()->accumulate_statistics(); | |
294 } | |
295 | |
263
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296 if (ZapUnusedHeapArea) { |
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297 // Save information needed to minimize mangling |
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298 heap->record_gen_tops_before_GC(); |
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299 } |
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300 |
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301 heap->print_heap_before_gc(); |
0 | 302 |
303 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
304 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
305 | |
306 size_t prev_used = heap->used(); | |
307 assert(promotion_failed() == false, "Sanity"); | |
308 | |
309 // Fill in TLABs | |
310 heap->accumulate_statistics_all_tlabs(); | |
311 heap->ensure_parsability(true); // retire TLABs | |
312 | |
313 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
314 HandleMark hm; // Discard invalid handles created during verification | |
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315 Universe::verify(" VerifyBeforeGC:"); |
0 | 316 } |
317 | |
318 { | |
319 ResourceMark rm; | |
320 HandleMark hm; | |
321 | |
322 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
323 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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324 TraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 325 TraceCollectorStats tcs(counters()); |
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326 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 327 |
328 if (TraceGen0Time) accumulated_time()->start(); | |
329 | |
330 // Let the size policy know we're starting | |
331 size_policy->minor_collection_begin(); | |
332 | |
333 // Verify the object start arrays. | |
334 if (VerifyObjectStartArray && | |
335 VerifyBeforeGC) { | |
336 old_gen->verify_object_start_array(); | |
337 } | |
338 | |
339 // Verify no unmarked old->young roots | |
340 if (VerifyRememberedSets) { | |
341 CardTableExtension::verify_all_young_refs_imprecise(); | |
342 } | |
343 | |
344 if (!ScavengeWithObjectsInToSpace) { | |
345 assert(young_gen->to_space()->is_empty(), | |
346 "Attempt to scavenge with live objects in to_space"); | |
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347 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 348 } else if (ZapUnusedHeapArea) { |
349 young_gen->to_space()->mangle_unused_area(); | |
350 } | |
351 save_to_space_top_before_gc(); | |
352 | |
353 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
354 | |
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355 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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356 reference_processor()->setup_policy(false); |
0 | 357 |
358 // We track how much was promoted to the next generation for | |
359 // the AdaptiveSizePolicy. | |
360 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
361 | |
362 // For PrintGCDetails | |
363 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
364 | |
365 // Reset our survivor overflow. | |
366 set_survivor_overflow(false); | |
367 | |
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368 // We need to save the old top values before |
0 | 369 // creating the promotion_manager. We pass the top |
370 // values to the card_table, to prevent it from | |
371 // straying into the promotion labs. | |
372 HeapWord* old_top = old_gen->object_space()->top(); | |
373 | |
374 // Release all previously held resources | |
375 gc_task_manager()->release_all_resources(); | |
376 | |
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377 // Set the number of GC threads to be used in this collection |
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378 gc_task_manager()->set_active_gang(); |
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379 gc_task_manager()->task_idle_workers(); |
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380 // Get the active number of workers here and use that value |
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381 // throughout the methods. |
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382 uint active_workers = gc_task_manager()->active_workers(); |
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383 heap->set_par_threads(active_workers); |
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384 |
0 | 385 PSPromotionManager::pre_scavenge(); |
386 | |
387 // We'll use the promotion manager again later. | |
388 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
389 { | |
390 // TraceTime("Roots"); | |
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391 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 392 |
393 GCTaskQueue* q = GCTaskQueue::create(); | |
394 | |
6817 | 395 if (!old_gen->object_space()->is_empty()) { |
396 // There are only old-to-young pointers if there are objects | |
397 // in the old gen. | |
398 uint stripe_total = active_workers; | |
399 for(uint i=0; i < stripe_total; i++) { | |
400 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); | |
401 } | |
0 | 402 } |
403 | |
404 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
405 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
406 // We scan the thread roots in parallel | |
407 Threads::create_thread_roots_tasks(q); | |
408 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
409 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
410 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
411 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
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412 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::class_loader_data)); |
0 | 413 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); |
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414 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 415 |
416 ParallelTaskTerminator terminator( | |
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417 active_workers, |
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418 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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419 if (active_workers > 1) { |
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420 for (uint j = 0; j < active_workers; j++) { |
0 | 421 q->enqueue(new StealTask(&terminator)); |
422 } | |
423 } | |
424 | |
425 gc_task_manager()->execute_and_wait(q); | |
426 } | |
427 | |
428 scavenge_midpoint.update(); | |
429 | |
430 // Process reference objects discovered during scavenge | |
431 { | |
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432 reference_processor()->setup_policy(false); // not always_clear |
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433 reference_processor()->set_active_mt_degree(active_workers); |
0 | 434 PSKeepAliveClosure keep_alive(promotion_manager); |
435 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
436 if (reference_processor()->processing_is_mt()) { | |
437 PSRefProcTaskExecutor task_executor; | |
438 reference_processor()->process_discovered_references( | |
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439 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
0 | 440 } else { |
441 reference_processor()->process_discovered_references( | |
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442 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
0 | 443 } |
444 } | |
445 | |
446 // Enqueue reference objects discovered during scavenge. | |
447 if (reference_processor()->processing_is_mt()) { | |
448 PSRefProcTaskExecutor task_executor; | |
449 reference_processor()->enqueue_discovered_references(&task_executor); | |
450 } else { | |
451 reference_processor()->enqueue_discovered_references(NULL); | |
452 } | |
453 | |
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454 // Unlink any dead interned Strings and process the remaining live ones. |
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455 PSScavengeRootsClosure root_closure(promotion_manager); |
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456 StringTable::unlink_or_oops_do(&_is_alive_closure, &root_closure); |
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457 |
0 | 458 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
459 PSPromotionManager::post_scavenge(); | |
460 | |
461 promotion_failure_occurred = promotion_failed(); | |
462 if (promotion_failure_occurred) { | |
463 clean_up_failed_promotion(); | |
464 if (PrintGC) { | |
465 gclog_or_tty->print("--"); | |
466 } | |
467 } | |
468 | |
469 // Let the size policy know we're done. Note that we count promotion | |
470 // failure cleanup time as part of the collection (otherwise, we're | |
471 // implicitly saying it's mutator time). | |
472 size_policy->minor_collection_end(gc_cause); | |
473 | |
474 if (!promotion_failure_occurred) { | |
475 // Swap the survivor spaces. | |
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476 |
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477 |
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478 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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479 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 480 young_gen->swap_spaces(); |
481 | |
482 size_t survived = young_gen->from_space()->used_in_bytes(); | |
483 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
484 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
485 | |
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486 // A successful scavenge should restart the GC time limit count which is |
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487 // for full GC's. |
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488 size_policy->reset_gc_overhead_limit_count(); |
0 | 489 if (UseAdaptiveSizePolicy) { |
490 // Calculate the new survivor size and tenuring threshold | |
491 | |
492 if (PrintAdaptiveSizePolicy) { | |
493 gclog_or_tty->print("AdaptiveSizeStart: "); | |
494 gclog_or_tty->stamp(); | |
495 gclog_or_tty->print_cr(" collection: %d ", | |
496 heap->total_collections()); | |
497 | |
498 if (Verbose) { | |
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499 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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500 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 501 } |
502 } | |
503 | |
504 | |
505 if (UsePerfData) { | |
506 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
507 counters->update_old_eden_size( | |
508 size_policy->calculated_eden_size_in_bytes()); | |
509 counters->update_old_promo_size( | |
510 size_policy->calculated_promo_size_in_bytes()); | |
511 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
512 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
513 counters->update_survived(survived); | |
514 counters->update_promoted(promoted); | |
515 counters->update_survivor_overflowed(_survivor_overflow); | |
516 } | |
517 | |
518 size_t survivor_limit = | |
519 size_policy->max_survivor_size(young_gen->max_size()); | |
520 _tenuring_threshold = | |
521 size_policy->compute_survivor_space_size_and_threshold( | |
522 _survivor_overflow, | |
523 _tenuring_threshold, | |
524 survivor_limit); | |
525 | |
526 if (PrintTenuringDistribution) { | |
527 gclog_or_tty->cr(); | |
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528 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
0 | 529 size_policy->calculated_survivor_size_in_bytes(), |
530 _tenuring_threshold, MaxTenuringThreshold); | |
531 } | |
532 | |
533 if (UsePerfData) { | |
534 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
535 counters->update_tenuring_threshold(_tenuring_threshold); | |
536 counters->update_survivor_size_counters(); | |
537 } | |
538 | |
539 // Do call at minor collections? | |
540 // Don't check if the size_policy is ready at this | |
541 // level. Let the size_policy check that internally. | |
542 if (UseAdaptiveSizePolicy && | |
543 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
544 ((gc_cause != GCCause::_java_lang_system_gc) || | |
545 UseAdaptiveSizePolicyWithSystemGC)) { | |
546 | |
547 // Calculate optimial free space amounts | |
548 assert(young_gen->max_size() > | |
549 young_gen->from_space()->capacity_in_bytes() + | |
550 young_gen->to_space()->capacity_in_bytes(), | |
551 "Sizes of space in young gen are out-of-bounds"); | |
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552 |
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553 size_t young_live = young_gen->used_in_bytes(); |
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554 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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555 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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556 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 557 size_t max_eden_size = young_gen->max_size() - |
558 young_gen->from_space()->capacity_in_bytes() - | |
559 young_gen->to_space()->capacity_in_bytes(); | |
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560 |
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561 // Used for diagnostics |
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562 size_policy->clear_generation_free_space_flags(); |
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563 |
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564 size_policy->compute_eden_space_size(young_live, |
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565 eden_live, |
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566 cur_eden, |
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567 max_eden_size, |
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568 false /* not full gc*/); |
0 | 569 |
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570 size_policy->check_gc_overhead_limit(young_live, |
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571 eden_live, |
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572 max_old_gen_size, |
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573 max_eden_size, |
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574 false /* not full gc*/, |
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575 gc_cause, |
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576 heap->collector_policy()); |
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577 |
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578 size_policy->decay_supplemental_growth(false /* not full gc*/); |
0 | 579 } |
580 // Resize the young generation at every collection | |
581 // even if new sizes have not been calculated. This is | |
582 // to allow resizes that may have been inhibited by the | |
583 // relative location of the "to" and "from" spaces. | |
584 | |
585 // Resizing the old gen at minor collects can cause increases | |
586 // that don't feed back to the generation sizing policy until | |
587 // a major collection. Don't resize the old gen here. | |
588 | |
589 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
590 size_policy->calculated_survivor_size_in_bytes()); | |
591 | |
592 if (PrintAdaptiveSizePolicy) { | |
593 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
594 heap->total_collections()); | |
595 } | |
596 } | |
597 | |
598 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
599 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
600 // Also update() will case adaptive NUMA chunk resizing. | |
601 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
602 young_gen->eden_space()->update(); | |
603 | |
604 heap->gc_policy_counters()->update_counters(); | |
605 | |
606 heap->resize_all_tlabs(); | |
607 | |
608 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
609 } | |
610 | |
611 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
612 | |
613 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
614 | |
4909 | 615 CodeCache::prune_scavenge_root_nmethods(); |
616 | |
0 | 617 // Re-verify object start arrays |
618 if (VerifyObjectStartArray && | |
619 VerifyAfterGC) { | |
620 old_gen->verify_object_start_array(); | |
621 } | |
622 | |
623 // Verify all old -> young cards are now precise | |
624 if (VerifyRememberedSets) { | |
625 // Precise verification will give false positives. Until this is fixed, | |
626 // use imprecise verification. | |
627 // CardTableExtension::verify_all_young_refs_precise(); | |
628 CardTableExtension::verify_all_young_refs_imprecise(); | |
629 } | |
630 | |
631 if (TraceGen0Time) accumulated_time()->stop(); | |
632 | |
633 if (PrintGC) { | |
634 if (PrintGCDetails) { | |
635 // Don't print a GC timestamp here. This is after the GC so | |
636 // would be confusing. | |
637 young_gen->print_used_change(young_gen_used_before); | |
638 } | |
639 heap->print_heap_change(prev_used); | |
640 } | |
641 | |
642 // Track memory usage and detect low memory | |
643 MemoryService::track_memory_usage(); | |
644 heap->update_counters(); | |
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645 |
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646 gc_task_manager()->release_idle_workers(); |
0 | 647 } |
648 | |
649 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
650 HandleMark hm; // Discard invalid handles created during verification | |
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651 Universe::verify(" VerifyAfterGC:"); |
0 | 652 } |
653 | |
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654 heap->print_heap_after_gc(); |
0 | 655 |
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656 if (ZapUnusedHeapArea) { |
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657 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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658 young_gen->from_space()->check_mangled_unused_area_complete(); |
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659 young_gen->to_space()->check_mangled_unused_area_complete(); |
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660 } |
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661 |
0 | 662 scavenge_exit.update(); |
663 | |
664 if (PrintGCTaskTimeStamps) { | |
665 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
666 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
667 scavenge_exit.ticks()); | |
668 gc_task_manager()->print_task_time_stamps(); | |
669 } | |
670 | |
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671 #ifdef TRACESPINNING |
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672 ParallelTaskTerminator::print_termination_counts(); |
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673 #endif |
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674 |
0 | 675 return !promotion_failure_occurred; |
676 } | |
677 | |
678 // This method iterates over all objects in the young generation, | |
679 // unforwarding markOops. It then restores any preserved mark oops, | |
680 // and clears the _preserved_mark_stack. | |
681 void PSScavenge::clean_up_failed_promotion() { | |
682 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
683 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
684 assert(promotion_failed(), "Sanity"); | |
685 | |
686 PSYoungGen* young_gen = heap->young_gen(); | |
687 | |
688 { | |
689 ResourceMark rm; | |
690 | |
691 // Unforward all pointers in the young gen. | |
692 PSPromotionFailedClosure unforward_closure; | |
693 young_gen->object_iterate(&unforward_closure); | |
694 | |
695 if (PrintGC && Verbose) { | |
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696 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 697 } |
698 | |
699 // Restore any saved marks. | |
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700 while (!_preserved_oop_stack.is_empty()) { |
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701 oop obj = _preserved_oop_stack.pop(); |
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702 markOop mark = _preserved_mark_stack.pop(); |
0 | 703 obj->set_mark(mark); |
704 } | |
705 | |
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706 // Clear the preserved mark and oop stack caches. |
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707 _preserved_mark_stack.clear(true); |
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708 _preserved_oop_stack.clear(true); |
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709 _promotion_failed = false; |
0 | 710 } |
711 | |
712 // Reset the PromotionFailureALot counters. | |
713 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
714 } | |
715 | |
716 // This method is called whenever an attempt to promote an object | |
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717 // fails. Some markOops will need preservation, some will not. Note |
0 | 718 // that the entire eden is traversed after a failed promotion, with |
719 // all forwarded headers replaced by the default markOop. This means | |
720 // it is not neccessary to preserve most markOops. | |
721 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
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722 _promotion_failed = true; |
0 | 723 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
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724 // Should use per-worker private stakcs hetre rather than |
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725 // locking a common pair of stacks. |
0 | 726 ThreadCritical tc; |
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727 _preserved_oop_stack.push(obj); |
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728 _preserved_mark_stack.push(obj_mark); |
0 | 729 } |
730 } | |
731 | |
732 bool PSScavenge::should_attempt_scavenge() { | |
733 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
734 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
735 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
736 | |
737 if (UsePerfData) { | |
738 counters->update_scavenge_skipped(not_skipped); | |
739 } | |
740 | |
741 PSYoungGen* young_gen = heap->young_gen(); | |
742 PSOldGen* old_gen = heap->old_gen(); | |
743 | |
744 if (!ScavengeWithObjectsInToSpace) { | |
745 // Do not attempt to promote unless to_space is empty | |
746 if (!young_gen->to_space()->is_empty()) { | |
747 _consecutive_skipped_scavenges++; | |
748 if (UsePerfData) { | |
749 counters->update_scavenge_skipped(to_space_not_empty); | |
750 } | |
751 return false; | |
752 } | |
753 } | |
754 | |
755 // Test to see if the scavenge will likely fail. | |
756 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
757 | |
758 // A similar test is done in the policy's should_full_GC(). If this is | |
759 // changed, decide if that test should also be changed. | |
760 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
761 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
762 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
763 | |
764 if (PrintGCDetails && Verbose) { | |
765 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
766 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
767 " padded_average_promoted " SIZE_FORMAT | |
768 " free in old gen " SIZE_FORMAT, | |
769 (size_t) policy->average_promoted_in_bytes(), | |
770 (size_t) policy->padded_average_promoted_in_bytes(), | |
771 old_gen->free_in_bytes()); | |
772 if (young_gen->used_in_bytes() < | |
773 (size_t) policy->padded_average_promoted_in_bytes()) { | |
774 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
775 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
776 } | |
777 } | |
778 | |
779 if (result) { | |
780 _consecutive_skipped_scavenges = 0; | |
781 } else { | |
782 _consecutive_skipped_scavenges++; | |
783 if (UsePerfData) { | |
784 counters->update_scavenge_skipped(promoted_too_large); | |
785 } | |
786 } | |
787 return result; | |
788 } | |
789 | |
790 // Used to add tasks | |
791 GCTaskManager* const PSScavenge::gc_task_manager() { | |
792 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
793 "shouldn't return NULL"); | |
794 return ParallelScavengeHeap::gc_task_manager(); | |
795 } | |
796 | |
797 void PSScavenge::initialize() { | |
798 // Arguments must have been parsed | |
799 | |
800 if (AlwaysTenure) { | |
801 _tenuring_threshold = 0; | |
802 } else if (NeverTenure) { | |
803 _tenuring_threshold = markOopDesc::max_age + 1; | |
804 } else { | |
805 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
806 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
807 MaxTenuringThreshold; | |
808 } | |
809 | |
810 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
811 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
812 | |
813 PSYoungGen* young_gen = heap->young_gen(); | |
814 PSOldGen* old_gen = heap->old_gen(); | |
815 | |
816 // Set boundary between young_gen and old_gen | |
817 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
818 "old above young"); | |
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819 set_young_generation_boundary(young_gen->eden_space()->bottom()); |
0 | 820 |
821 // Initialize ref handling object for scavenging. | |
822 MemRegion mr = young_gen->reserved(); | |
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823 |
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824 _ref_processor = |
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825 new ReferenceProcessor(mr, // span |
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826 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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827 (int) ParallelGCThreads, // mt processing degree |
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828 true, // mt discovery |
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829 (int) ParallelGCThreads, // mt discovery degree |
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830 true, // atomic_discovery |
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831 NULL, // header provides liveness info |
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832 false); // next field updates do not need write barrier |
0 | 833 |
834 // Cache the cardtable | |
835 BarrierSet* bs = Universe::heap()->barrier_set(); | |
836 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
837 _card_table = (CardTableExtension*)bs; | |
838 | |
839 _counters = new CollectorCounters("PSScavenge", 0); | |
840 } |