Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | f81a7c0c618d |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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; | |
| 62 int PSScavenge::_tenuring_threshold = 0; | |
| 63 HeapWord* PSScavenge::_young_generation_boundary = NULL; | |
| 64 elapsedTimer PSScavenge::_accumulated_time; | |
| 6197 | 65 Stack<markOop, mtGC> PSScavenge::_preserved_mark_stack; |
| 66 Stack<oop, mtGC> PSScavenge::_preserved_oop_stack; | |
| 0 | 67 CollectorCounters* PSScavenge::_counters = NULL; |
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68 bool PSScavenge::_promotion_failed = false; |
| 0 | 69 |
| 70 // Define before use | |
| 71 class PSIsAliveClosure: public BoolObjectClosure { | |
| 72 public: | |
| 73 void do_object(oop p) { | |
| 74 assert(false, "Do not call."); | |
| 75 } | |
| 76 bool do_object_b(oop p) { | |
| 77 return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded(); | |
| 78 } | |
| 79 }; | |
| 80 | |
| 81 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
| 82 | |
| 83 class PSKeepAliveClosure: public OopClosure { | |
| 84 protected: | |
| 85 MutableSpace* _to_space; | |
| 86 PSPromotionManager* _promotion_manager; | |
| 87 | |
| 88 public: | |
| 89 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
| 90 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 91 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 92 _to_space = heap->young_gen()->to_space(); | |
| 93 | |
| 94 assert(_promotion_manager != NULL, "Sanity"); | |
| 95 } | |
| 96 | |
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97 template <class T> void do_oop_work(T* p) { |
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98 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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99 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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100 "expected an oop while scanning weak refs"); |
| 0 | 101 |
| 102 // Weak refs may be visited more than once. | |
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103 if (PSScavenge::should_scavenge(p, _to_space)) { |
| 4909 | 104 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
| 0 | 105 } |
| 106 } | |
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107 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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108 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
| 0 | 109 }; |
| 110 | |
| 111 class PSEvacuateFollowersClosure: public VoidClosure { | |
| 112 private: | |
| 113 PSPromotionManager* _promotion_manager; | |
| 114 public: | |
| 115 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
| 116 | |
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117 virtual void do_void() { |
| 0 | 118 assert(_promotion_manager != NULL, "Sanity"); |
| 119 _promotion_manager->drain_stacks(true); | |
| 120 guarantee(_promotion_manager->stacks_empty(), | |
| 121 "stacks should be empty at this point"); | |
| 122 } | |
| 123 }; | |
| 124 | |
| 125 class PSPromotionFailedClosure : public ObjectClosure { | |
| 126 virtual void do_object(oop obj) { | |
| 127 if (obj->is_forwarded()) { | |
| 128 obj->init_mark(); | |
| 129 } | |
| 130 } | |
| 131 }; | |
| 132 | |
| 133 class PSRefProcTaskProxy: public GCTask { | |
| 134 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
| 135 ProcessTask & _rp_task; | |
| 136 uint _work_id; | |
| 137 public: | |
| 138 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
| 139 : _rp_task(rp_task), | |
| 140 _work_id(work_id) | |
| 141 { } | |
| 142 | |
| 143 private: | |
| 144 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
| 145 virtual void do_it(GCTaskManager* manager, uint which); | |
| 146 }; | |
| 147 | |
| 148 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
| 149 { | |
| 150 PSPromotionManager* promotion_manager = | |
| 151 PSPromotionManager::gc_thread_promotion_manager(which); | |
| 152 assert(promotion_manager != NULL, "sanity check"); | |
| 153 PSKeepAliveClosure keep_alive(promotion_manager); | |
| 154 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
| 155 PSIsAliveClosure is_alive; | |
| 156 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
| 157 } | |
| 158 | |
| 159 class PSRefEnqueueTaskProxy: public GCTask { | |
| 160 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
| 161 EnqueueTask& _enq_task; | |
| 162 uint _work_id; | |
| 163 | |
| 164 public: | |
| 165 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
| 166 : _enq_task(enq_task), | |
| 167 _work_id(work_id) | |
| 168 { } | |
| 169 | |
| 170 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
| 171 virtual void do_it(GCTaskManager* manager, uint which) | |
| 172 { | |
| 173 _enq_task.work(_work_id); | |
| 174 } | |
| 175 }; | |
| 176 | |
| 177 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
| 178 virtual void execute(ProcessTask& task); | |
| 179 virtual void execute(EnqueueTask& task); | |
| 180 }; | |
| 181 | |
| 182 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
| 183 { | |
| 184 GCTaskQueue* q = GCTaskQueue::create(); | |
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185 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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186 for(uint i=0; i < manager->active_workers(); i++) { |
| 0 | 187 q->enqueue(new PSRefProcTaskProxy(task, i)); |
| 188 } | |
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189 ParallelTaskTerminator terminator(manager->active_workers(), |
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190 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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191 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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192 for (uint j = 0; j < manager->active_workers(); j++) { |
| 0 | 193 q->enqueue(new StealTask(&terminator)); |
| 194 } | |
| 195 } | |
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196 manager->execute_and_wait(q); |
| 0 | 197 } |
| 198 | |
| 199 | |
| 200 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
| 201 { | |
| 202 GCTaskQueue* q = GCTaskQueue::create(); | |
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203 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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204 for(uint i=0; i < manager->active_workers(); i++) { |
| 0 | 205 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
| 206 } | |
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207 manager->execute_and_wait(q); |
| 0 | 208 } |
| 209 | |
| 210 // This method contains all heap specific policy for invoking scavenge. | |
| 211 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
| 212 // scavenge. It will not clean up after failed promotions, bail out if | |
| 213 // we've exceeded policy time limits, or any other special behavior. | |
| 214 // All such policy should be placed here. | |
| 215 // | |
| 216 // Note that this method should only be called from the vm_thread while | |
| 217 // at a safepoint! | |
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218 bool PSScavenge::invoke() { |
| 0 | 219 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 220 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 221 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 222 | |
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223 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
| 0 | 224 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
| 225 | |
| 226 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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227 IsGCActiveMark mark; |
| 0 | 228 |
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229 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
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230 const bool need_full_gc = !scavenge_done || |
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231 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
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232 bool full_gc_done = false; |
| 0 | 233 |
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234 if (UsePerfData) { |
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235 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
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236 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
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237 counters->update_full_follows_scavenge(ffs_val); |
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238 } |
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239 |
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240 if (need_full_gc) { |
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241 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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242 CollectorPolicy* cp = heap->collector_policy(); |
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243 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
| 0 | 244 |
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245 if (UseParallelOldGC) { |
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246 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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247 } else { |
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248 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
| 0 | 249 } |
| 250 } | |
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251 |
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252 return full_gc_done; |
| 0 | 253 } |
| 254 | |
| 255 // This method contains no policy. You should probably | |
| 256 // be calling invoke() instead. | |
| 257 bool PSScavenge::invoke_no_policy() { | |
| 258 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 259 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 260 | |
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261 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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262 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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263 |
| 0 | 264 TimeStamp scavenge_entry; |
| 265 TimeStamp scavenge_midpoint; | |
| 266 TimeStamp scavenge_exit; | |
| 267 | |
| 268 scavenge_entry.update(); | |
| 269 | |
| 270 if (GC_locker::check_active_before_gc()) { | |
| 271 return false; | |
| 272 } | |
| 273 | |
| 274 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 275 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 276 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 277 | |
| 278 // Check for potential problems. | |
| 279 if (!should_attempt_scavenge()) { | |
| 280 return false; | |
| 281 } | |
| 282 | |
| 283 bool promotion_failure_occurred = false; | |
| 284 | |
| 285 PSYoungGen* young_gen = heap->young_gen(); | |
| 286 PSOldGen* old_gen = heap->old_gen(); | |
| 287 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
| 288 heap->increment_total_collections(); | |
| 289 | |
| 290 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 291 | |
| 292 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 293 UseAdaptiveSizePolicyWithSystemGC) { | |
| 294 // Gather the feedback data for eden occupancy. | |
| 295 young_gen->eden_space()->accumulate_statistics(); | |
| 296 } | |
| 297 | |
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298 if (ZapUnusedHeapArea) { |
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299 // Save information needed to minimize mangling |
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300 heap->record_gen_tops_before_GC(); |
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301 } |
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302 |
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303 heap->print_heap_before_gc(); |
| 0 | 304 |
| 305 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
| 306 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
| 307 | |
| 308 size_t prev_used = heap->used(); | |
| 309 assert(promotion_failed() == false, "Sanity"); | |
| 310 | |
| 311 // Fill in TLABs | |
| 312 heap->accumulate_statistics_all_tlabs(); | |
| 313 heap->ensure_parsability(true); // retire TLABs | |
| 314 | |
| 315 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 316 HandleMark hm; // Discard invalid handles created during verification | |
| 317 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 318 Universe::verify(true); | |
| 319 } | |
| 320 | |
| 321 { | |
| 322 ResourceMark rm; | |
| 323 HandleMark hm; | |
| 324 | |
| 325 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 326 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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327 TraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
| 0 | 328 TraceCollectorStats tcs(counters()); |
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329 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
| 0 | 330 |
| 331 if (TraceGen0Time) accumulated_time()->start(); | |
| 332 | |
| 333 // Let the size policy know we're starting | |
| 334 size_policy->minor_collection_begin(); | |
| 335 | |
| 336 // Verify the object start arrays. | |
| 337 if (VerifyObjectStartArray && | |
| 338 VerifyBeforeGC) { | |
| 339 old_gen->verify_object_start_array(); | |
| 340 } | |
| 341 | |
| 342 // Verify no unmarked old->young roots | |
| 343 if (VerifyRememberedSets) { | |
| 344 CardTableExtension::verify_all_young_refs_imprecise(); | |
| 345 } | |
| 346 | |
| 347 if (!ScavengeWithObjectsInToSpace) { | |
| 348 assert(young_gen->to_space()->is_empty(), | |
| 349 "Attempt to scavenge with live objects in to_space"); | |
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350 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
| 0 | 351 } else if (ZapUnusedHeapArea) { |
| 352 young_gen->to_space()->mangle_unused_area(); | |
| 353 } | |
| 354 save_to_space_top_before_gc(); | |
| 355 | |
| 356 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 357 | |
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358 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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359 reference_processor()->setup_policy(false); |
| 0 | 360 |
| 361 // We track how much was promoted to the next generation for | |
| 362 // the AdaptiveSizePolicy. | |
| 363 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
| 364 | |
| 365 // For PrintGCDetails | |
| 366 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
| 367 | |
| 368 // Reset our survivor overflow. | |
| 369 set_survivor_overflow(false); | |
| 370 | |
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371 // We need to save the old top values before |
| 0 | 372 // creating the promotion_manager. We pass the top |
| 373 // values to the card_table, to prevent it from | |
| 374 // straying into the promotion labs. | |
| 375 HeapWord* old_top = old_gen->object_space()->top(); | |
| 376 | |
| 377 // Release all previously held resources | |
| 378 gc_task_manager()->release_all_resources(); | |
| 379 | |
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380 // Set the number of GC threads to be used in this collection |
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381 gc_task_manager()->set_active_gang(); |
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382 gc_task_manager()->task_idle_workers(); |
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383 // Get the active number of workers here and use that value |
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384 // throughout the methods. |
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385 uint active_workers = gc_task_manager()->active_workers(); |
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386 heap->set_par_threads(active_workers); |
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387 |
| 0 | 388 PSPromotionManager::pre_scavenge(); |
| 389 | |
| 390 // We'll use the promotion manager again later. | |
| 391 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
| 392 { | |
| 393 // TraceTime("Roots"); | |
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394 ParallelScavengeHeap::ParStrongRootsScope psrs; |
| 0 | 395 |
| 396 GCTaskQueue* q = GCTaskQueue::create(); | |
| 397 | |
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398 uint stripe_total = active_workers; |
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399 for(uint i=0; i < stripe_total; i++) { |
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400 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); |
| 0 | 401 } |
| 402 | |
| 403 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
| 404 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
| 405 // We scan the thread roots in parallel | |
| 406 Threads::create_thread_roots_tasks(q); | |
| 407 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
| 408 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
| 409 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
| 410 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
| 411 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); | |
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412 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
| 0 | 413 |
| 414 ParallelTaskTerminator terminator( | |
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415 active_workers, |
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416 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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417 if (active_workers > 1) { |
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418 for (uint j = 0; j < active_workers; j++) { |
| 0 | 419 q->enqueue(new StealTask(&terminator)); |
| 420 } | |
| 421 } | |
| 422 | |
| 423 gc_task_manager()->execute_and_wait(q); | |
| 424 } | |
| 425 | |
| 426 scavenge_midpoint.update(); | |
| 427 | |
| 428 // Process reference objects discovered during scavenge | |
| 429 { | |
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430 reference_processor()->setup_policy(false); // not always_clear |
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431 reference_processor()->set_active_mt_degree(active_workers); |
| 0 | 432 PSKeepAliveClosure keep_alive(promotion_manager); |
| 433 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
| 434 if (reference_processor()->processing_is_mt()) { | |
| 435 PSRefProcTaskExecutor task_executor; | |
| 436 reference_processor()->process_discovered_references( | |
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437 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
| 0 | 438 } else { |
| 439 reference_processor()->process_discovered_references( | |
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440 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
| 0 | 441 } |
| 442 } | |
| 443 | |
| 444 // Enqueue reference objects discovered during scavenge. | |
| 445 if (reference_processor()->processing_is_mt()) { | |
| 446 PSRefProcTaskExecutor task_executor; | |
| 447 reference_processor()->enqueue_discovered_references(&task_executor); | |
| 448 } else { | |
| 449 reference_processor()->enqueue_discovered_references(NULL); | |
| 450 } | |
| 451 | |
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452 // Unlink any dead interned Strings |
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453 StringTable::unlink(&_is_alive_closure); |
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454 // Process the remaining live ones |
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455 PSScavengeRootsClosure root_closure(promotion_manager); |
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456 StringTable::oops_do(&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(); | |
| 528 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)", | |
| 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"); | |
| 552 size_t max_eden_size = young_gen->max_size() - | |
| 553 young_gen->from_space()->capacity_in_bytes() - | |
| 554 young_gen->to_space()->capacity_in_bytes(); | |
| 555 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
| 556 young_gen->eden_space()->used_in_bytes(), | |
| 557 old_gen->used_in_bytes(), | |
| 558 young_gen->eden_space()->capacity_in_bytes(), | |
| 559 old_gen->max_gen_size(), | |
| 560 max_eden_size, | |
| 561 false /* full gc*/, | |
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562 gc_cause, |
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563 heap->collector_policy()); |
| 0 | 564 |
| 565 } | |
| 566 // Resize the young generation at every collection | |
| 567 // even if new sizes have not been calculated. This is | |
| 568 // to allow resizes that may have been inhibited by the | |
| 569 // relative location of the "to" and "from" spaces. | |
| 570 | |
| 571 // Resizing the old gen at minor collects can cause increases | |
| 572 // that don't feed back to the generation sizing policy until | |
| 573 // a major collection. Don't resize the old gen here. | |
| 574 | |
| 575 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
| 576 size_policy->calculated_survivor_size_in_bytes()); | |
| 577 | |
| 578 if (PrintAdaptiveSizePolicy) { | |
| 579 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 580 heap->total_collections()); | |
| 581 } | |
| 582 } | |
| 583 | |
| 584 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
| 585 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
| 586 // Also update() will case adaptive NUMA chunk resizing. | |
| 587 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
| 588 young_gen->eden_space()->update(); | |
| 589 | |
| 590 heap->gc_policy_counters()->update_counters(); | |
| 591 | |
| 592 heap->resize_all_tlabs(); | |
| 593 | |
| 594 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
| 595 } | |
| 596 | |
| 597 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 598 | |
| 599 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
| 600 | |
| 4909 | 601 CodeCache::prune_scavenge_root_nmethods(); |
| 602 | |
| 0 | 603 // Re-verify object start arrays |
| 604 if (VerifyObjectStartArray && | |
| 605 VerifyAfterGC) { | |
| 606 old_gen->verify_object_start_array(); | |
| 607 } | |
| 608 | |
| 609 // Verify all old -> young cards are now precise | |
| 610 if (VerifyRememberedSets) { | |
| 611 // Precise verification will give false positives. Until this is fixed, | |
| 612 // use imprecise verification. | |
| 613 // CardTableExtension::verify_all_young_refs_precise(); | |
| 614 CardTableExtension::verify_all_young_refs_imprecise(); | |
| 615 } | |
| 616 | |
| 617 if (TraceGen0Time) accumulated_time()->stop(); | |
| 618 | |
| 619 if (PrintGC) { | |
| 620 if (PrintGCDetails) { | |
| 621 // Don't print a GC timestamp here. This is after the GC so | |
| 622 // would be confusing. | |
| 623 young_gen->print_used_change(young_gen_used_before); | |
| 624 } | |
| 625 heap->print_heap_change(prev_used); | |
| 626 } | |
| 627 | |
| 628 // Track memory usage and detect low memory | |
| 629 MemoryService::track_memory_usage(); | |
| 630 heap->update_counters(); | |
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631 |
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632 gc_task_manager()->release_idle_workers(); |
| 0 | 633 } |
| 634 | |
| 635 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 636 HandleMark hm; // Discard invalid handles created during verification | |
| 637 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 638 Universe::verify(false); | |
| 639 } | |
| 640 | |
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641 heap->print_heap_after_gc(); |
| 0 | 642 |
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643 if (ZapUnusedHeapArea) { |
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644 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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645 young_gen->from_space()->check_mangled_unused_area_complete(); |
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646 young_gen->to_space()->check_mangled_unused_area_complete(); |
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647 } |
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648 |
| 0 | 649 scavenge_exit.update(); |
| 650 | |
| 651 if (PrintGCTaskTimeStamps) { | |
| 652 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
| 653 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
| 654 scavenge_exit.ticks()); | |
| 655 gc_task_manager()->print_task_time_stamps(); | |
| 656 } | |
| 657 | |
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658 #ifdef TRACESPINNING |
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659 ParallelTaskTerminator::print_termination_counts(); |
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660 #endif |
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661 |
| 0 | 662 return !promotion_failure_occurred; |
| 663 } | |
| 664 | |
| 665 // This method iterates over all objects in the young generation, | |
| 666 // unforwarding markOops. It then restores any preserved mark oops, | |
| 667 // and clears the _preserved_mark_stack. | |
| 668 void PSScavenge::clean_up_failed_promotion() { | |
| 669 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 670 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 671 assert(promotion_failed(), "Sanity"); | |
| 672 | |
| 673 PSYoungGen* young_gen = heap->young_gen(); | |
| 674 | |
| 675 { | |
| 676 ResourceMark rm; | |
| 677 | |
| 678 // Unforward all pointers in the young gen. | |
| 679 PSPromotionFailedClosure unforward_closure; | |
| 680 young_gen->object_iterate(&unforward_closure); | |
| 681 | |
| 682 if (PrintGC && Verbose) { | |
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683 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
| 0 | 684 } |
| 685 | |
| 686 // Restore any saved marks. | |
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687 while (!_preserved_oop_stack.is_empty()) { |
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688 oop obj = _preserved_oop_stack.pop(); |
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689 markOop mark = _preserved_mark_stack.pop(); |
| 0 | 690 obj->set_mark(mark); |
| 691 } | |
| 692 | |
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693 // Clear the preserved mark and oop stack caches. |
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694 _preserved_mark_stack.clear(true); |
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695 _preserved_oop_stack.clear(true); |
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696 _promotion_failed = false; |
| 0 | 697 } |
| 698 | |
| 699 // Reset the PromotionFailureALot counters. | |
| 700 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
| 701 } | |
| 702 | |
| 703 // This method is called whenever an attempt to promote an object | |
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704 // fails. Some markOops will need preservation, some will not. Note |
| 0 | 705 // that the entire eden is traversed after a failed promotion, with |
| 706 // all forwarded headers replaced by the default markOop. This means | |
| 707 // it is not neccessary to preserve most markOops. | |
| 708 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
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709 _promotion_failed = true; |
| 0 | 710 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
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711 // Should use per-worker private stakcs hetre rather than |
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712 // locking a common pair of stacks. |
| 0 | 713 ThreadCritical tc; |
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714 _preserved_oop_stack.push(obj); |
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715 _preserved_mark_stack.push(obj_mark); |
| 0 | 716 } |
| 717 } | |
| 718 | |
| 719 bool PSScavenge::should_attempt_scavenge() { | |
| 720 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 721 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 722 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
| 723 | |
| 724 if (UsePerfData) { | |
| 725 counters->update_scavenge_skipped(not_skipped); | |
| 726 } | |
| 727 | |
| 728 PSYoungGen* young_gen = heap->young_gen(); | |
| 729 PSOldGen* old_gen = heap->old_gen(); | |
| 730 | |
| 731 if (!ScavengeWithObjectsInToSpace) { | |
| 732 // Do not attempt to promote unless to_space is empty | |
| 733 if (!young_gen->to_space()->is_empty()) { | |
| 734 _consecutive_skipped_scavenges++; | |
| 735 if (UsePerfData) { | |
| 736 counters->update_scavenge_skipped(to_space_not_empty); | |
| 737 } | |
| 738 return false; | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 // Test to see if the scavenge will likely fail. | |
| 743 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
| 744 | |
| 745 // A similar test is done in the policy's should_full_GC(). If this is | |
| 746 // changed, decide if that test should also be changed. | |
| 747 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
| 748 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
| 749 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
| 750 | |
| 751 if (PrintGCDetails && Verbose) { | |
| 752 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
| 753 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
| 754 " padded_average_promoted " SIZE_FORMAT | |
| 755 " free in old gen " SIZE_FORMAT, | |
| 756 (size_t) policy->average_promoted_in_bytes(), | |
| 757 (size_t) policy->padded_average_promoted_in_bytes(), | |
| 758 old_gen->free_in_bytes()); | |
| 759 if (young_gen->used_in_bytes() < | |
| 760 (size_t) policy->padded_average_promoted_in_bytes()) { | |
| 761 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
| 762 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
| 763 } | |
| 764 } | |
| 765 | |
| 766 if (result) { | |
| 767 _consecutive_skipped_scavenges = 0; | |
| 768 } else { | |
| 769 _consecutive_skipped_scavenges++; | |
| 770 if (UsePerfData) { | |
| 771 counters->update_scavenge_skipped(promoted_too_large); | |
| 772 } | |
| 773 } | |
| 774 return result; | |
| 775 } | |
| 776 | |
| 777 // Used to add tasks | |
| 778 GCTaskManager* const PSScavenge::gc_task_manager() { | |
| 779 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
| 780 "shouldn't return NULL"); | |
| 781 return ParallelScavengeHeap::gc_task_manager(); | |
| 782 } | |
| 783 | |
| 784 void PSScavenge::initialize() { | |
| 785 // Arguments must have been parsed | |
| 786 | |
| 787 if (AlwaysTenure) { | |
| 788 _tenuring_threshold = 0; | |
| 789 } else if (NeverTenure) { | |
| 790 _tenuring_threshold = markOopDesc::max_age + 1; | |
| 791 } else { | |
| 792 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
| 793 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
| 794 MaxTenuringThreshold; | |
| 795 } | |
| 796 | |
| 797 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 798 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 799 | |
| 800 PSYoungGen* young_gen = heap->young_gen(); | |
| 801 PSOldGen* old_gen = heap->old_gen(); | |
| 802 | |
| 803 // Set boundary between young_gen and old_gen | |
| 804 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
| 805 "old above young"); | |
| 806 _young_generation_boundary = young_gen->eden_space()->bottom(); | |
| 807 | |
| 808 // Initialize ref handling object for scavenging. | |
| 809 MemRegion mr = young_gen->reserved(); | |
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810 |
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811 _ref_processor = |
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812 new ReferenceProcessor(mr, // span |
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813 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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814 (int) ParallelGCThreads, // mt processing degree |
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815 true, // mt discovery |
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816 (int) ParallelGCThreads, // mt discovery degree |
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817 true, // atomic_discovery |
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818 NULL, // header provides liveness info |
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819 false); // next field updates do not need write barrier |
| 0 | 820 |
| 821 // Cache the cardtable | |
| 822 BarrierSet* bs = Universe::heap()->barrier_set(); | |
| 823 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
| 824 _card_table = (CardTableExtension*)bs; | |
| 825 | |
| 826 _counters = new CollectorCounters("PSScavenge", 0); | |
| 827 } |