Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 52b4284cb496 0982ec23da03 |
| children |
| rev | line source |
|---|---|
| 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 | |
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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 } |