Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 894b1d7c7e01 |
| children | 74ee0db180fa |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
2 * Copyright (c) 2002, 2010, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
| 31 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
| 32 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
| 33 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
| 34 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
| 35 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 36 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 37 #include "gc_interface/gcCause.hpp" | |
| 38 #include "memory/collectorPolicy.hpp" | |
| 39 #include "memory/gcLocker.inline.hpp" | |
| 40 #include "memory/referencePolicy.hpp" | |
| 41 #include "memory/referenceProcessor.hpp" | |
| 42 #include "memory/resourceArea.hpp" | |
| 43 #include "oops/oop.inline.hpp" | |
| 44 #include "oops/oop.psgc.inline.hpp" | |
| 45 #include "runtime/biasedLocking.hpp" | |
| 46 #include "runtime/fprofiler.hpp" | |
| 47 #include "runtime/handles.inline.hpp" | |
| 48 #include "runtime/threadCritical.hpp" | |
| 49 #include "runtime/vmThread.hpp" | |
| 50 #include "runtime/vm_operations.hpp" | |
| 51 #include "services/memoryService.hpp" | |
| 52 #include "utilities/stack.inline.hpp" | |
| 0 | 53 |
| 54 | |
| 55 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
| 56 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
| 57 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
| 58 CardTableExtension* PSScavenge::_card_table = NULL; | |
| 59 bool PSScavenge::_survivor_overflow = false; | |
| 60 int PSScavenge::_tenuring_threshold = 0; | |
| 61 HeapWord* PSScavenge::_young_generation_boundary = NULL; | |
| 62 elapsedTimer PSScavenge::_accumulated_time; | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
63 Stack<markOop> PSScavenge::_preserved_mark_stack; |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
64 Stack<oop> PSScavenge::_preserved_oop_stack; |
| 0 | 65 CollectorCounters* PSScavenge::_counters = NULL; |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
66 bool PSScavenge::_promotion_failed = false; |
| 0 | 67 |
| 68 // Define before use | |
| 69 class PSIsAliveClosure: public BoolObjectClosure { | |
| 70 public: | |
| 71 void do_object(oop p) { | |
| 72 assert(false, "Do not call."); | |
| 73 } | |
| 74 bool do_object_b(oop p) { | |
| 75 return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded(); | |
| 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
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
95 template <class T> void do_oop_work(T* p) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
96 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
97 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
98 "expected an oop while scanning weak refs"); |
| 0 | 99 |
| 100 // Weak refs may be visited more than once. | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
101 if (PSScavenge::should_scavenge(p, _to_space)) { |
| 0 | 102 PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p); |
| 103 } | |
| 104 } | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
105 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
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
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
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(); | |
| 183 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 184 q->enqueue(new PSRefProcTaskProxy(task, i)); | |
| 185 } | |
| 186 ParallelTaskTerminator terminator( | |
|
1706
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
187 ParallelScavengeHeap::gc_task_manager()->workers(), |
|
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
188 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
| 0 | 189 if (task.marks_oops_alive() && ParallelGCThreads > 1) { |
| 190 for (uint j=0; j<ParallelGCThreads; j++) { | |
| 191 q->enqueue(new StealTask(&terminator)); | |
| 192 } | |
| 193 } | |
| 194 ParallelScavengeHeap::gc_task_manager()->execute_and_wait(q); | |
| 195 } | |
| 196 | |
| 197 | |
| 198 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
| 199 { | |
| 200 GCTaskQueue* q = GCTaskQueue::create(); | |
| 201 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 202 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); | |
| 203 } | |
| 204 ParallelScavengeHeap::gc_task_manager()->execute_and_wait(q); | |
| 205 } | |
| 206 | |
| 207 // This method contains all heap specific policy for invoking scavenge. | |
| 208 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
| 209 // scavenge. It will not clean up after failed promotions, bail out if | |
| 210 // we've exceeded policy time limits, or any other special behavior. | |
| 211 // All such policy should be placed here. | |
| 212 // | |
| 213 // Note that this method should only be called from the vm_thread while | |
| 214 // at a safepoint! | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
215 void PSScavenge::invoke() { |
| 0 | 216 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 217 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 218 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 219 | |
| 220 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 221 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 222 | |
| 223 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
224 IsGCActiveMark mark; |
| 0 | 225 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
226 bool scavenge_was_done = PSScavenge::invoke_no_policy(); |
| 0 | 227 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
228 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
229 if (UsePerfData) |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
230 counters->update_full_follows_scavenge(0); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
231 if (!scavenge_was_done || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
232 policy->should_full_GC(heap->old_gen()->free_in_bytes())) { |
| 0 | 233 if (UsePerfData) |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
234 counters->update_full_follows_scavenge(full_follows_scavenge); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
235 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
236 CollectorPolicy* cp = heap->collector_policy(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
237 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
| 0 | 238 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
239 if (UseParallelOldGC) { |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
240 PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
241 } else { |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
242 PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
| 0 | 243 } |
| 244 } | |
| 245 } | |
| 246 | |
| 247 // This method contains no policy. You should probably | |
| 248 // be calling invoke() instead. | |
| 249 bool PSScavenge::invoke_no_policy() { | |
| 250 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 251 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 252 | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
253 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
254 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
255 |
| 0 | 256 TimeStamp scavenge_entry; |
| 257 TimeStamp scavenge_midpoint; | |
| 258 TimeStamp scavenge_exit; | |
| 259 | |
| 260 scavenge_entry.update(); | |
| 261 | |
| 262 if (GC_locker::check_active_before_gc()) { | |
| 263 return false; | |
| 264 } | |
| 265 | |
| 266 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 267 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 268 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 269 | |
| 270 // Check for potential problems. | |
| 271 if (!should_attempt_scavenge()) { | |
| 272 return false; | |
| 273 } | |
| 274 | |
| 275 bool promotion_failure_occurred = false; | |
| 276 | |
| 277 PSYoungGen* young_gen = heap->young_gen(); | |
| 278 PSOldGen* old_gen = heap->old_gen(); | |
| 279 PSPermGen* perm_gen = heap->perm_gen(); | |
| 280 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
| 281 heap->increment_total_collections(); | |
| 282 | |
| 283 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 284 | |
| 285 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 286 UseAdaptiveSizePolicyWithSystemGC) { | |
| 287 // Gather the feedback data for eden occupancy. | |
| 288 young_gen->eden_space()->accumulate_statistics(); | |
| 289 } | |
| 290 | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
291 if (ZapUnusedHeapArea) { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
292 // Save information needed to minimize mangling |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
293 heap->record_gen_tops_before_GC(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
294 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
295 |
| 0 | 296 if (PrintHeapAtGC) { |
| 297 Universe::print_heap_before_gc(); | |
| 298 } | |
| 299 | |
| 300 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
| 301 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
| 302 | |
| 303 size_t prev_used = heap->used(); | |
| 304 assert(promotion_failed() == false, "Sanity"); | |
| 305 | |
| 306 // Fill in TLABs | |
| 307 heap->accumulate_statistics_all_tlabs(); | |
| 308 heap->ensure_parsability(true); // retire TLABs | |
| 309 | |
| 310 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 311 HandleMark hm; // Discard invalid handles created during verification | |
| 312 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 313 Universe::verify(true); | |
| 314 } | |
| 315 | |
| 316 { | |
| 317 ResourceMark rm; | |
| 318 HandleMark hm; | |
| 319 | |
| 320 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 321 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 322 TraceTime t1("GC", PrintGC, !PrintGCDetails, gclog_or_tty); | |
| 323 TraceCollectorStats tcs(counters()); | |
| 324 TraceMemoryManagerStats tms(false /* not full GC */); | |
| 325 | |
| 326 if (TraceGen0Time) accumulated_time()->start(); | |
| 327 | |
| 328 // Let the size policy know we're starting | |
| 329 size_policy->minor_collection_begin(); | |
| 330 | |
| 331 // Verify the object start arrays. | |
| 332 if (VerifyObjectStartArray && | |
| 333 VerifyBeforeGC) { | |
| 334 old_gen->verify_object_start_array(); | |
| 335 perm_gen->verify_object_start_array(); | |
| 336 } | |
| 337 | |
| 338 // Verify no unmarked old->young roots | |
| 339 if (VerifyRememberedSets) { | |
| 340 CardTableExtension::verify_all_young_refs_imprecise(); | |
| 341 } | |
| 342 | |
| 343 if (!ScavengeWithObjectsInToSpace) { | |
| 344 assert(young_gen->to_space()->is_empty(), | |
| 345 "Attempt to scavenge with live objects in to_space"); | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
346 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
| 0 | 347 } else if (ZapUnusedHeapArea) { |
| 348 young_gen->to_space()->mangle_unused_area(); | |
| 349 } | |
| 350 save_to_space_top_before_gc(); | |
| 351 | |
| 352 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
| 353 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 354 | |
| 355 reference_processor()->enable_discovery(); | |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
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 | |
| 368 // We need to save the old/perm top values before | |
| 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 HeapWord* perm_top = perm_gen->object_space()->top(); | |
| 374 | |
| 375 // Release all previously held resources | |
| 376 gc_task_manager()->release_all_resources(); | |
| 377 | |
| 378 PSPromotionManager::pre_scavenge(); | |
| 379 | |
| 380 // We'll use the promotion manager again later. | |
| 381 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
| 382 { | |
| 383 // TraceTime("Roots"); | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
384 ParallelScavengeHeap::ParStrongRootsScope psrs; |
| 0 | 385 |
| 386 GCTaskQueue* q = GCTaskQueue::create(); | |
| 387 | |
| 388 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 389 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i)); | |
| 390 } | |
| 391 | |
| 392 q->enqueue(new SerialOldToYoungRootsTask(perm_gen, perm_top)); | |
| 393 | |
| 394 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
| 395 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
| 396 // We scan the thread roots in parallel | |
| 397 Threads::create_thread_roots_tasks(q); | |
| 398 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
| 399 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
| 400 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
| 401 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
| 402 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
403 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
| 0 | 404 |
| 405 ParallelTaskTerminator terminator( | |
|
1706
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
406 gc_task_manager()->workers(), |
|
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
407 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
| 0 | 408 if (ParallelGCThreads>1) { |
| 409 for (uint j=0; j<ParallelGCThreads; j++) { | |
| 410 q->enqueue(new StealTask(&terminator)); | |
| 411 } | |
| 412 } | |
| 413 | |
| 414 gc_task_manager()->execute_and_wait(q); | |
| 415 } | |
| 416 | |
| 417 scavenge_midpoint.update(); | |
| 418 | |
| 419 // Process reference objects discovered during scavenge | |
| 420 { | |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
421 reference_processor()->setup_policy(false); // not always_clear |
| 0 | 422 PSKeepAliveClosure keep_alive(promotion_manager); |
| 423 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
| 424 if (reference_processor()->processing_is_mt()) { | |
| 425 PSRefProcTaskExecutor task_executor; | |
| 426 reference_processor()->process_discovered_references( | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
269
diff
changeset
|
427 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
| 0 | 428 } else { |
| 429 reference_processor()->process_discovered_references( | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
269
diff
changeset
|
430 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
| 0 | 431 } |
| 432 } | |
| 433 | |
| 434 // Enqueue reference objects discovered during scavenge. | |
| 435 if (reference_processor()->processing_is_mt()) { | |
| 436 PSRefProcTaskExecutor task_executor; | |
| 437 reference_processor()->enqueue_discovered_references(&task_executor); | |
| 438 } else { | |
| 439 reference_processor()->enqueue_discovered_references(NULL); | |
| 440 } | |
| 441 | |
| 442 // Finally, flush the promotion_manager's labs, and deallocate its stacks. | |
| 443 PSPromotionManager::post_scavenge(); | |
| 444 | |
| 445 promotion_failure_occurred = promotion_failed(); | |
| 446 if (promotion_failure_occurred) { | |
| 447 clean_up_failed_promotion(); | |
| 448 if (PrintGC) { | |
| 449 gclog_or_tty->print("--"); | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 // Let the size policy know we're done. Note that we count promotion | |
| 454 // failure cleanup time as part of the collection (otherwise, we're | |
| 455 // implicitly saying it's mutator time). | |
| 456 size_policy->minor_collection_end(gc_cause); | |
| 457 | |
| 458 if (!promotion_failure_occurred) { | |
| 459 // Swap the survivor spaces. | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
460 |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
461 |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
462 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
463 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
| 0 | 464 young_gen->swap_spaces(); |
| 465 | |
| 466 size_t survived = young_gen->from_space()->used_in_bytes(); | |
| 467 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
| 468 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
| 469 | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
470 // A successful scavenge should restart the GC time limit count which is |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
471 // for full GC's. |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
472 size_policy->reset_gc_overhead_limit_count(); |
| 0 | 473 if (UseAdaptiveSizePolicy) { |
| 474 // Calculate the new survivor size and tenuring threshold | |
| 475 | |
| 476 if (PrintAdaptiveSizePolicy) { | |
| 477 gclog_or_tty->print("AdaptiveSizeStart: "); | |
| 478 gclog_or_tty->stamp(); | |
| 479 gclog_or_tty->print_cr(" collection: %d ", | |
| 480 heap->total_collections()); | |
| 481 | |
| 482 if (Verbose) { | |
| 483 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
| 484 " perm_gen_capacity: %d ", | |
| 485 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
| 486 perm_gen->capacity_in_bytes()); | |
| 487 } | |
| 488 } | |
| 489 | |
| 490 | |
| 491 if (UsePerfData) { | |
| 492 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
| 493 counters->update_old_eden_size( | |
| 494 size_policy->calculated_eden_size_in_bytes()); | |
| 495 counters->update_old_promo_size( | |
| 496 size_policy->calculated_promo_size_in_bytes()); | |
| 497 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
| 498 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
| 499 counters->update_survived(survived); | |
| 500 counters->update_promoted(promoted); | |
| 501 counters->update_survivor_overflowed(_survivor_overflow); | |
| 502 } | |
| 503 | |
| 504 size_t survivor_limit = | |
| 505 size_policy->max_survivor_size(young_gen->max_size()); | |
| 506 _tenuring_threshold = | |
| 507 size_policy->compute_survivor_space_size_and_threshold( | |
| 508 _survivor_overflow, | |
| 509 _tenuring_threshold, | |
| 510 survivor_limit); | |
| 511 | |
| 512 if (PrintTenuringDistribution) { | |
| 513 gclog_or_tty->cr(); | |
| 514 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)", | |
| 515 size_policy->calculated_survivor_size_in_bytes(), | |
| 516 _tenuring_threshold, MaxTenuringThreshold); | |
| 517 } | |
| 518 | |
| 519 if (UsePerfData) { | |
| 520 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
| 521 counters->update_tenuring_threshold(_tenuring_threshold); | |
| 522 counters->update_survivor_size_counters(); | |
| 523 } | |
| 524 | |
| 525 // Do call at minor collections? | |
| 526 // Don't check if the size_policy is ready at this | |
| 527 // level. Let the size_policy check that internally. | |
| 528 if (UseAdaptiveSizePolicy && | |
| 529 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
| 530 ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 531 UseAdaptiveSizePolicyWithSystemGC)) { | |
| 532 | |
| 533 // Calculate optimial free space amounts | |
| 534 assert(young_gen->max_size() > | |
| 535 young_gen->from_space()->capacity_in_bytes() + | |
| 536 young_gen->to_space()->capacity_in_bytes(), | |
| 537 "Sizes of space in young gen are out-of-bounds"); | |
| 538 size_t max_eden_size = young_gen->max_size() - | |
| 539 young_gen->from_space()->capacity_in_bytes() - | |
| 540 young_gen->to_space()->capacity_in_bytes(); | |
| 541 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
| 542 young_gen->eden_space()->used_in_bytes(), | |
| 543 old_gen->used_in_bytes(), | |
| 544 perm_gen->used_in_bytes(), | |
| 545 young_gen->eden_space()->capacity_in_bytes(), | |
| 546 old_gen->max_gen_size(), | |
| 547 max_eden_size, | |
| 548 false /* full gc*/, | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
549 gc_cause, |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
550 heap->collector_policy()); |
| 0 | 551 |
| 552 } | |
| 553 // Resize the young generation at every collection | |
| 554 // even if new sizes have not been calculated. This is | |
| 555 // to allow resizes that may have been inhibited by the | |
| 556 // relative location of the "to" and "from" spaces. | |
| 557 | |
| 558 // Resizing the old gen at minor collects can cause increases | |
| 559 // that don't feed back to the generation sizing policy until | |
| 560 // a major collection. Don't resize the old gen here. | |
| 561 | |
| 562 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
| 563 size_policy->calculated_survivor_size_in_bytes()); | |
| 564 | |
| 565 if (PrintAdaptiveSizePolicy) { | |
| 566 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 567 heap->total_collections()); | |
| 568 } | |
| 569 } | |
| 570 | |
| 571 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
| 572 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
| 573 // Also update() will case adaptive NUMA chunk resizing. | |
| 574 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
| 575 young_gen->eden_space()->update(); | |
| 576 | |
| 577 heap->gc_policy_counters()->update_counters(); | |
| 578 | |
| 579 heap->resize_all_tlabs(); | |
| 580 | |
| 581 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
| 582 } | |
| 583 | |
| 584 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 585 | |
| 586 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
| 587 | |
| 588 // Re-verify object start arrays | |
| 589 if (VerifyObjectStartArray && | |
| 590 VerifyAfterGC) { | |
| 591 old_gen->verify_object_start_array(); | |
| 592 perm_gen->verify_object_start_array(); | |
| 593 } | |
| 594 | |
| 595 // Verify all old -> young cards are now precise | |
| 596 if (VerifyRememberedSets) { | |
| 597 // Precise verification will give false positives. Until this is fixed, | |
| 598 // use imprecise verification. | |
| 599 // CardTableExtension::verify_all_young_refs_precise(); | |
| 600 CardTableExtension::verify_all_young_refs_imprecise(); | |
| 601 } | |
| 602 | |
| 603 if (TraceGen0Time) accumulated_time()->stop(); | |
| 604 | |
| 605 if (PrintGC) { | |
| 606 if (PrintGCDetails) { | |
| 607 // Don't print a GC timestamp here. This is after the GC so | |
| 608 // would be confusing. | |
| 609 young_gen->print_used_change(young_gen_used_before); | |
| 610 } | |
| 611 heap->print_heap_change(prev_used); | |
| 612 } | |
| 613 | |
| 614 // Track memory usage and detect low memory | |
| 615 MemoryService::track_memory_usage(); | |
| 616 heap->update_counters(); | |
| 617 } | |
| 618 | |
| 619 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 620 HandleMark hm; // Discard invalid handles created during verification | |
| 621 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 622 Universe::verify(false); | |
| 623 } | |
| 624 | |
| 625 if (PrintHeapAtGC) { | |
| 626 Universe::print_heap_after_gc(); | |
| 627 } | |
| 628 | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
629 if (ZapUnusedHeapArea) { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
630 young_gen->eden_space()->check_mangled_unused_area_complete(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
631 young_gen->from_space()->check_mangled_unused_area_complete(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
632 young_gen->to_space()->check_mangled_unused_area_complete(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
633 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
634 |
| 0 | 635 scavenge_exit.update(); |
| 636 | |
| 637 if (PrintGCTaskTimeStamps) { | |
| 638 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
| 639 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
| 640 scavenge_exit.ticks()); | |
| 641 gc_task_manager()->print_task_time_stamps(); | |
| 642 } | |
| 643 | |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
644 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
645 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
646 #endif |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
647 |
| 0 | 648 return !promotion_failure_occurred; |
| 649 } | |
| 650 | |
| 651 // This method iterates over all objects in the young generation, | |
| 652 // unforwarding markOops. It then restores any preserved mark oops, | |
| 653 // and clears the _preserved_mark_stack. | |
| 654 void PSScavenge::clean_up_failed_promotion() { | |
| 655 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 656 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 657 assert(promotion_failed(), "Sanity"); | |
| 658 | |
| 659 PSYoungGen* young_gen = heap->young_gen(); | |
| 660 | |
| 661 { | |
| 662 ResourceMark rm; | |
| 663 | |
| 664 // Unforward all pointers in the young gen. | |
| 665 PSPromotionFailedClosure unforward_closure; | |
| 666 young_gen->object_iterate(&unforward_closure); | |
| 667 | |
| 668 if (PrintGC && Verbose) { | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
669 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
| 0 | 670 } |
| 671 | |
| 672 // Restore any saved marks. | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
673 while (!_preserved_oop_stack.is_empty()) { |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
674 oop obj = _preserved_oop_stack.pop(); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
675 markOop mark = _preserved_mark_stack.pop(); |
| 0 | 676 obj->set_mark(mark); |
| 677 } | |
| 678 | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
679 // Clear the preserved mark and oop stack caches. |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
680 _preserved_mark_stack.clear(true); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
681 _preserved_oop_stack.clear(true); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
682 _promotion_failed = false; |
| 0 | 683 } |
| 684 | |
| 685 // Reset the PromotionFailureALot counters. | |
| 686 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
| 687 } | |
| 688 | |
| 689 // This method is called whenever an attempt to promote an object | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
690 // fails. Some markOops will need preservation, some will not. Note |
| 0 | 691 // that the entire eden is traversed after a failed promotion, with |
| 692 // all forwarded headers replaced by the default markOop. This means | |
| 693 // it is not neccessary to preserve most markOops. | |
| 694 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
695 _promotion_failed = true; |
| 0 | 696 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
| 697 ThreadCritical tc; | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
698 _preserved_oop_stack.push(obj); |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
699 _preserved_mark_stack.push(obj_mark); |
| 0 | 700 } |
| 701 } | |
| 702 | |
| 703 bool PSScavenge::should_attempt_scavenge() { | |
| 704 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 705 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 706 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
| 707 | |
| 708 if (UsePerfData) { | |
| 709 counters->update_scavenge_skipped(not_skipped); | |
| 710 } | |
| 711 | |
| 712 PSYoungGen* young_gen = heap->young_gen(); | |
| 713 PSOldGen* old_gen = heap->old_gen(); | |
| 714 | |
| 715 if (!ScavengeWithObjectsInToSpace) { | |
| 716 // Do not attempt to promote unless to_space is empty | |
| 717 if (!young_gen->to_space()->is_empty()) { | |
| 718 _consecutive_skipped_scavenges++; | |
| 719 if (UsePerfData) { | |
| 720 counters->update_scavenge_skipped(to_space_not_empty); | |
| 721 } | |
| 722 return false; | |
| 723 } | |
| 724 } | |
| 725 | |
| 726 // Test to see if the scavenge will likely fail. | |
| 727 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
| 728 | |
| 729 // A similar test is done in the policy's should_full_GC(). If this is | |
| 730 // changed, decide if that test should also be changed. | |
| 731 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
| 732 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
| 733 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
| 734 | |
| 735 if (PrintGCDetails && Verbose) { | |
| 736 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
| 737 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
| 738 " padded_average_promoted " SIZE_FORMAT | |
| 739 " free in old gen " SIZE_FORMAT, | |
| 740 (size_t) policy->average_promoted_in_bytes(), | |
| 741 (size_t) policy->padded_average_promoted_in_bytes(), | |
| 742 old_gen->free_in_bytes()); | |
| 743 if (young_gen->used_in_bytes() < | |
| 744 (size_t) policy->padded_average_promoted_in_bytes()) { | |
| 745 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
| 746 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
| 747 } | |
| 748 } | |
| 749 | |
| 750 if (result) { | |
| 751 _consecutive_skipped_scavenges = 0; | |
| 752 } else { | |
| 753 _consecutive_skipped_scavenges++; | |
| 754 if (UsePerfData) { | |
| 755 counters->update_scavenge_skipped(promoted_too_large); | |
| 756 } | |
| 757 } | |
| 758 return result; | |
| 759 } | |
| 760 | |
| 761 // Used to add tasks | |
| 762 GCTaskManager* const PSScavenge::gc_task_manager() { | |
| 763 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
| 764 "shouldn't return NULL"); | |
| 765 return ParallelScavengeHeap::gc_task_manager(); | |
| 766 } | |
| 767 | |
| 768 void PSScavenge::initialize() { | |
| 769 // Arguments must have been parsed | |
| 770 | |
| 771 if (AlwaysTenure) { | |
| 772 _tenuring_threshold = 0; | |
| 773 } else if (NeverTenure) { | |
| 774 _tenuring_threshold = markOopDesc::max_age + 1; | |
| 775 } else { | |
| 776 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
| 777 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
| 778 MaxTenuringThreshold; | |
| 779 } | |
| 780 | |
| 781 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 782 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 783 | |
| 784 PSYoungGen* young_gen = heap->young_gen(); | |
| 785 PSOldGen* old_gen = heap->old_gen(); | |
| 786 PSPermGen* perm_gen = heap->perm_gen(); | |
| 787 | |
| 788 // Set boundary between young_gen and old_gen | |
| 789 assert(perm_gen->reserved().end() <= old_gen->object_space()->bottom(), | |
| 790 "perm above old"); | |
| 791 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
| 792 "old above young"); | |
| 793 _young_generation_boundary = young_gen->eden_space()->bottom(); | |
| 794 | |
| 795 // Initialize ref handling object for scavenging. | |
| 796 MemRegion mr = young_gen->reserved(); | |
| 797 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 798 mr, // span | |
| 799 true, // atomic_discovery | |
| 800 true, // mt_discovery | |
| 801 NULL, // is_alive_non_header | |
| 802 ParallelGCThreads, | |
| 803 ParallelRefProcEnabled); | |
| 804 | |
| 805 // Cache the cardtable | |
| 806 BarrierSet* bs = Universe::heap()->barrier_set(); | |
| 807 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
| 808 _card_table = (CardTableExtension*)bs; | |
| 809 | |
| 810 _counters = new CollectorCounters("PSScavenge", 0); | |
| 811 } |