Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 10361:eda078b01c65
8015268: NPG: 2.5% regression in young GC times on CRM Sales Opty
Summary: Split SystemDictionary and ClassLoaderDataGraph root processing to help load balancing.
Reviewed-by: tschatzl, johnc
author | stefank |
---|---|
date | Mon, 27 May 2013 15:22:59 +0200 |
parents | 001ec9515f84 |
children | 8dbc025ff709 |
rev | line source |
---|---|
0 | 1 /* |
7623
203f64878aab
7102489: RFE: cleanup jlong typedef on __APPLE__and _LLP64 systems.
hseigel
parents:
6865
diff
changeset
|
2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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" |
2379
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
26 #include "classfile/symbolTable.hpp" |
4909 | 27 #include "code/codeCache.hpp" |
1972 | 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
36 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
38 #include "gc_implementation/shared/spaceDecorator.hpp" | |
39 #include "gc_interface/gcCause.hpp" | |
40 #include "memory/collectorPolicy.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "memory/resourceArea.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "oops/oop.psgc.inline.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/threadCritical.hpp" | |
51 #include "runtime/vmThread.hpp" | |
52 #include "runtime/vm_operations.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/stack.inline.hpp" | |
0 | 55 |
56 | |
57 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
58 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
59 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
60 CardTableExtension* PSScavenge::_card_table = NULL; | |
61 bool PSScavenge::_survivor_overflow = false; | |
6818 | 62 uint PSScavenge::_tenuring_threshold = 0; |
0 | 63 HeapWord* PSScavenge::_young_generation_boundary = NULL; |
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; |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
68 bool PSScavenge::_promotion_failed = false; |
0 | 69 |
70 // Define before use | |
71 class PSIsAliveClosure: public BoolObjectClosure { | |
72 public: | |
73 bool do_object_b(oop p) { | |
74 return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded(); | |
75 } | |
76 }; | |
77 | |
78 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
79 | |
80 class PSKeepAliveClosure: public OopClosure { | |
81 protected: | |
82 MutableSpace* _to_space; | |
83 PSPromotionManager* _promotion_manager; | |
84 | |
85 public: | |
86 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
87 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
88 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
89 _to_space = heap->young_gen()->to_space(); | |
90 | |
91 assert(_promotion_manager != NULL, "Sanity"); | |
92 } | |
93 | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
94 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
|
95 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
|
96 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
|
97 "expected an oop while scanning weak refs"); |
0 | 98 |
99 // 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
|
100 if (PSScavenge::should_scavenge(p, _to_space)) { |
4909 | 101 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
0 | 102 } |
103 } | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
104 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
|
105 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 106 }; |
107 | |
108 class PSEvacuateFollowersClosure: public VoidClosure { | |
109 private: | |
110 PSPromotionManager* _promotion_manager; | |
111 public: | |
112 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
113 | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
114 virtual void do_void() { |
0 | 115 assert(_promotion_manager != NULL, "Sanity"); |
116 _promotion_manager->drain_stacks(true); | |
117 guarantee(_promotion_manager->stacks_empty(), | |
118 "stacks should be empty at this point"); | |
119 } | |
120 }; | |
121 | |
122 class PSPromotionFailedClosure : public ObjectClosure { | |
123 virtual void do_object(oop obj) { | |
124 if (obj->is_forwarded()) { | |
125 obj->init_mark(); | |
126 } | |
127 } | |
128 }; | |
129 | |
130 class PSRefProcTaskProxy: public GCTask { | |
131 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
132 ProcessTask & _rp_task; | |
133 uint _work_id; | |
134 public: | |
135 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
136 : _rp_task(rp_task), | |
137 _work_id(work_id) | |
138 { } | |
139 | |
140 private: | |
141 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
142 virtual void do_it(GCTaskManager* manager, uint which); | |
143 }; | |
144 | |
145 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
146 { | |
147 PSPromotionManager* promotion_manager = | |
148 PSPromotionManager::gc_thread_promotion_manager(which); | |
149 assert(promotion_manager != NULL, "sanity check"); | |
150 PSKeepAliveClosure keep_alive(promotion_manager); | |
151 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
152 PSIsAliveClosure is_alive; | |
153 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
154 } | |
155 | |
156 class PSRefEnqueueTaskProxy: public GCTask { | |
157 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
158 EnqueueTask& _enq_task; | |
159 uint _work_id; | |
160 | |
161 public: | |
162 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
163 : _enq_task(enq_task), | |
164 _work_id(work_id) | |
165 { } | |
166 | |
167 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
168 virtual void do_it(GCTaskManager* manager, uint which) | |
169 { | |
170 _enq_task.work(_work_id); | |
171 } | |
172 }; | |
173 | |
174 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
175 virtual void execute(ProcessTask& task); | |
176 virtual void execute(EnqueueTask& task); | |
177 }; | |
178 | |
179 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
180 { | |
181 GCTaskQueue* q = GCTaskQueue::create(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
182 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
183 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 184 q->enqueue(new PSRefProcTaskProxy(task, i)); |
185 } | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
186 ParallelTaskTerminator terminator(manager->active_workers(), |
1706
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
187 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
188 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
189 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 190 q->enqueue(new StealTask(&terminator)); |
191 } | |
192 } | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
193 manager->execute_and_wait(q); |
0 | 194 } |
195 | |
196 | |
197 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
198 { | |
199 GCTaskQueue* q = GCTaskQueue::create(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
200 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
201 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 202 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
203 } | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
204 manager->execute_and_wait(q); |
0 | 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! | |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
215 bool 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 | |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
220 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
0 | 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 |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
226 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
227 const bool need_full_gc = !scavenge_done || |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
228 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
229 bool full_gc_done = false; |
0 | 230 |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
231 if (UsePerfData) { |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
232 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
233 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
234 counters->update_full_follows_scavenge(ffs_val); |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
235 } |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
236 |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
237 if (need_full_gc) { |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
238 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
|
239 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
|
240 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 241 |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
242 if (UseParallelOldGC) { |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
243 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
244 } else { |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
245 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 246 } |
247 } | |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
248 |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4909
diff
changeset
|
249 return full_gc_done; |
0 | 250 } |
251 | |
252 // This method contains no policy. You should probably | |
253 // be calling invoke() instead. | |
254 bool PSScavenge::invoke_no_policy() { | |
255 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
256 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
257 | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
258 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
259 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
260 |
0 | 261 TimeStamp scavenge_entry; |
262 TimeStamp scavenge_midpoint; | |
263 TimeStamp scavenge_exit; | |
264 | |
265 scavenge_entry.update(); | |
266 | |
267 if (GC_locker::check_active_before_gc()) { | |
268 return false; | |
269 } | |
270 | |
271 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
272 GCCause::Cause gc_cause = heap->gc_cause(); | |
273 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
274 | |
275 // Check for potential problems. | |
276 if (!should_attempt_scavenge()) { | |
277 return false; | |
278 } | |
279 | |
280 bool promotion_failure_occurred = false; | |
281 | |
282 PSYoungGen* young_gen = heap->young_gen(); | |
283 PSOldGen* old_gen = heap->old_gen(); | |
284 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
285 heap->increment_total_collections(); | |
286 | |
287 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
288 | |
289 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
290 UseAdaptiveSizePolicyWithSystemGC) { | |
291 // Gather the feedback data for eden occupancy. | |
292 young_gen->eden_space()->accumulate_statistics(); | |
293 } | |
294 | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
295 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
296 // 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
|
297 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
|
298 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
299 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4095
diff
changeset
|
300 heap->print_heap_before_gc(); |
0 | 301 |
302 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
303 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
304 | |
305 size_t prev_used = heap->used(); | |
306 assert(promotion_failed() == false, "Sanity"); | |
307 | |
308 // Fill in TLABs | |
309 heap->accumulate_statistics_all_tlabs(); | |
310 heap->ensure_parsability(true); // retire TLABs | |
311 | |
312 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
313 HandleMark hm; // Discard invalid handles created during verification | |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
7623
diff
changeset
|
314 Universe::verify(" VerifyBeforeGC:"); |
0 | 315 } |
316 | |
317 { | |
318 ResourceMark rm; | |
319 HandleMark hm; | |
320 | |
321 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
322 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
4913
diff
changeset
|
323 TraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 324 TraceCollectorStats tcs(counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
2379
diff
changeset
|
325 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 326 |
327 if (TraceGen0Time) accumulated_time()->start(); | |
328 | |
329 // Let the size policy know we're starting | |
330 size_policy->minor_collection_begin(); | |
331 | |
332 // Verify the object start arrays. | |
333 if (VerifyObjectStartArray && | |
334 VerifyBeforeGC) { | |
335 old_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 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
353 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3356
diff
changeset
|
354 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
355 reference_processor()->setup_policy(false); |
0 | 356 |
357 // We track how much was promoted to the next generation for | |
358 // the AdaptiveSizePolicy. | |
359 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
360 | |
361 // For PrintGCDetails | |
362 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
363 | |
364 // Reset our survivor overflow. | |
365 set_survivor_overflow(false); | |
366 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
367 // We need to save the old top values before |
0 | 368 // creating the promotion_manager. We pass the top |
369 // values to the card_table, to prevent it from | |
370 // straying into the promotion labs. | |
371 HeapWord* old_top = old_gen->object_space()->top(); | |
372 | |
373 // Release all previously held resources | |
374 gc_task_manager()->release_all_resources(); | |
375 | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
376 // Set the number of GC threads to be used in this collection |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
377 gc_task_manager()->set_active_gang(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
378 gc_task_manager()->task_idle_workers(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
379 // Get the active number of workers here and use that value |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
380 // throughout the methods. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
381 uint active_workers = gc_task_manager()->active_workers(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
382 heap->set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
383 |
0 | 384 PSPromotionManager::pre_scavenge(); |
385 | |
386 // We'll use the promotion manager again later. | |
387 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
388 { | |
389 // TraceTime("Roots"); | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
390 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 391 |
392 GCTaskQueue* q = GCTaskQueue::create(); | |
393 | |
6817 | 394 if (!old_gen->object_space()->is_empty()) { |
395 // There are only old-to-young pointers if there are objects | |
396 // in the old gen. | |
397 uint stripe_total = active_workers; | |
398 for(uint i=0; i < stripe_total; i++) { | |
399 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); | |
400 } | |
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)); | |
10361
eda078b01c65
8015268: NPG: 2.5% regression in young GC times on CRM Sales Opty
stefank
parents:
10327
diff
changeset
|
411 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::class_loader_data)); |
0 | 412 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
413 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 414 |
415 ParallelTaskTerminator terminator( | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
416 active_workers, |
1706
9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
tonyp
parents:
1638
diff
changeset
|
417 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
418 if (active_workers > 1) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
419 for (uint j = 0; j < active_workers; j++) { |
0 | 420 q->enqueue(new StealTask(&terminator)); |
421 } | |
422 } | |
423 | |
424 gc_task_manager()->execute_and_wait(q); | |
425 } | |
426 | |
427 scavenge_midpoint.update(); | |
428 | |
429 // Process reference objects discovered during scavenge | |
430 { | |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
431 reference_processor()->setup_policy(false); // not always_clear |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
432 reference_processor()->set_active_mt_degree(active_workers); |
0 | 433 PSKeepAliveClosure keep_alive(promotion_manager); |
434 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
435 if (reference_processor()->processing_is_mt()) { | |
436 PSRefProcTaskExecutor task_executor; | |
437 reference_processor()->process_discovered_references( | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
269
diff
changeset
|
438 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
0 | 439 } else { |
440 reference_processor()->process_discovered_references( | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
269
diff
changeset
|
441 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
0 | 442 } |
443 } | |
444 | |
445 // Enqueue reference objects discovered during scavenge. | |
446 if (reference_processor()->processing_is_mt()) { | |
447 PSRefProcTaskExecutor task_executor; | |
448 reference_processor()->enqueue_discovered_references(&task_executor); | |
449 } else { | |
450 reference_processor()->enqueue_discovered_references(NULL); | |
451 } | |
452 | |
2379
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
453 // Unlink any dead interned Strings |
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
454 StringTable::unlink(&_is_alive_closure); |
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
455 // Process the remaining live ones |
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
456 PSScavengeRootsClosure root_closure(promotion_manager); |
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
457 StringTable::oops_do(&root_closure); |
b099aaf51bf8
6962931: move interned strings out of the perm gen
jcoomes
parents:
2369
diff
changeset
|
458 |
0 | 459 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
460 PSPromotionManager::post_scavenge(); | |
461 | |
462 promotion_failure_occurred = promotion_failed(); | |
463 if (promotion_failure_occurred) { | |
464 clean_up_failed_promotion(); | |
465 if (PrintGC) { | |
466 gclog_or_tty->print("--"); | |
467 } | |
468 } | |
469 | |
470 // Let the size policy know we're done. Note that we count promotion | |
471 // failure cleanup time as part of the collection (otherwise, we're | |
472 // implicitly saying it's mutator time). | |
473 size_policy->minor_collection_end(gc_cause); | |
474 | |
475 if (!promotion_failure_occurred) { | |
476 // Swap the survivor spaces. | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
477 |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
478 |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
479 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
|
480 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 481 young_gen->swap_spaces(); |
482 | |
483 size_t survived = young_gen->from_space()->used_in_bytes(); | |
484 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
485 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
486 | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
487 // 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
|
488 // for full GC's. |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
989
diff
changeset
|
489 size_policy->reset_gc_overhead_limit_count(); |
0 | 490 if (UseAdaptiveSizePolicy) { |
491 // Calculate the new survivor size and tenuring threshold | |
492 | |
493 if (PrintAdaptiveSizePolicy) { | |
494 gclog_or_tty->print("AdaptiveSizeStart: "); | |
495 gclog_or_tty->stamp(); | |
496 gclog_or_tty->print_cr(" collection: %d ", | |
497 heap->total_collections()); | |
498 | |
499 if (Verbose) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
500 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
501 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 502 } |
503 } | |
504 | |
505 | |
506 if (UsePerfData) { | |
507 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
508 counters->update_old_eden_size( | |
509 size_policy->calculated_eden_size_in_bytes()); | |
510 counters->update_old_promo_size( | |
511 size_policy->calculated_promo_size_in_bytes()); | |
512 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
513 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
514 counters->update_survived(survived); | |
515 counters->update_promoted(promoted); | |
516 counters->update_survivor_overflowed(_survivor_overflow); | |
517 } | |
518 | |
519 size_t survivor_limit = | |
520 size_policy->max_survivor_size(young_gen->max_size()); | |
521 _tenuring_threshold = | |
522 size_policy->compute_survivor_space_size_and_threshold( | |
523 _survivor_overflow, | |
524 _tenuring_threshold, | |
525 survivor_limit); | |
526 | |
527 if (PrintTenuringDistribution) { | |
528 gclog_or_tty->cr(); | |
7623
203f64878aab
7102489: RFE: cleanup jlong typedef on __APPLE__and _LLP64 systems.
hseigel
parents:
6865
diff
changeset
|
529 gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
0 | 530 size_policy->calculated_survivor_size_in_bytes(), |
531 _tenuring_threshold, MaxTenuringThreshold); | |
532 } | |
533 | |
534 if (UsePerfData) { | |
535 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
536 counters->update_tenuring_threshold(_tenuring_threshold); | |
537 counters->update_survivor_size_counters(); | |
538 } | |
539 | |
540 // Do call at minor collections? | |
541 // Don't check if the size_policy is ready at this | |
542 // level. Let the size_policy check that internally. | |
543 if (UseAdaptiveSizePolicy && | |
544 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
545 ((gc_cause != GCCause::_java_lang_system_gc) || | |
546 UseAdaptiveSizePolicyWithSystemGC)) { | |
547 | |
548 // Calculate optimial free space amounts | |
549 assert(young_gen->max_size() > | |
550 young_gen->from_space()->capacity_in_bytes() + | |
551 young_gen->to_space()->capacity_in_bytes(), | |
552 "Sizes of space in young gen are out-of-bounds"); | |
10288
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
553 |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
554 size_t young_live = young_gen->used_in_bytes(); |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
555 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
556 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
557 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 558 size_t max_eden_size = young_gen->max_size() - |
559 young_gen->from_space()->capacity_in_bytes() - | |
560 young_gen->to_space()->capacity_in_bytes(); | |
10288
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
561 |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
562 // Used for diagnostics |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
563 size_policy->clear_generation_free_space_flags(); |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
564 |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
565 size_policy->compute_eden_space_size(young_live, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
566 eden_live, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
567 cur_eden, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
568 max_eden_size, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
569 false /* not full gc*/); |
0 | 570 |
10288
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
571 size_policy->check_gc_overhead_limit(young_live, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
572 eden_live, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
573 max_old_gen_size, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
574 max_eden_size, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
575 false /* not full gc*/, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
576 gc_cause, |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
577 heap->collector_policy()); |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
578 |
eba99d16dc6f
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
10186
diff
changeset
|
579 size_policy->decay_supplemental_growth(false /* not full gc*/); |
0 | 580 } |
581 // Resize the young generation at every collection | |
582 // even if new sizes have not been calculated. This is | |
583 // to allow resizes that may have been inhibited by the | |
584 // relative location of the "to" and "from" spaces. | |
585 | |
586 // Resizing the old gen at minor collects can cause increases | |
587 // that don't feed back to the generation sizing policy until | |
588 // a major collection. Don't resize the old gen here. | |
589 | |
590 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
591 size_policy->calculated_survivor_size_in_bytes()); | |
592 | |
593 if (PrintAdaptiveSizePolicy) { | |
594 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
595 heap->total_collections()); | |
596 } | |
597 } | |
598 | |
599 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
600 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
601 // Also update() will case adaptive NUMA chunk resizing. | |
602 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
603 young_gen->eden_space()->update(); | |
604 | |
605 heap->gc_policy_counters()->update_counters(); | |
606 | |
607 heap->resize_all_tlabs(); | |
608 | |
609 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
610 } | |
611 | |
612 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
613 | |
614 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
615 | |
4909 | 616 CodeCache::prune_scavenge_root_nmethods(); |
617 | |
0 | 618 // Re-verify object start arrays |
619 if (VerifyObjectStartArray && | |
620 VerifyAfterGC) { | |
621 old_gen->verify_object_start_array(); | |
622 } | |
623 | |
624 // Verify all old -> young cards are now precise | |
625 if (VerifyRememberedSets) { | |
626 // Precise verification will give false positives. Until this is fixed, | |
627 // use imprecise verification. | |
628 // CardTableExtension::verify_all_young_refs_precise(); | |
629 CardTableExtension::verify_all_young_refs_imprecise(); | |
630 } | |
631 | |
632 if (TraceGen0Time) accumulated_time()->stop(); | |
633 | |
634 if (PrintGC) { | |
635 if (PrintGCDetails) { | |
636 // Don't print a GC timestamp here. This is after the GC so | |
637 // would be confusing. | |
638 young_gen->print_used_change(young_gen_used_before); | |
639 } | |
640 heap->print_heap_change(prev_used); | |
641 } | |
642 | |
643 // Track memory usage and detect low memory | |
644 MemoryService::track_memory_usage(); | |
645 heap->update_counters(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
646 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
647 gc_task_manager()->release_idle_workers(); |
0 | 648 } |
649 | |
650 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
651 HandleMark hm; // Discard invalid handles created during verification | |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
7623
diff
changeset
|
652 Universe::verify(" VerifyAfterGC:"); |
0 | 653 } |
654 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4095
diff
changeset
|
655 heap->print_heap_after_gc(); |
0 | 656 |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
657 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
658 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
|
659 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
|
660 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
|
661 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
662 |
0 | 663 scavenge_exit.update(); |
664 | |
665 if (PrintGCTaskTimeStamps) { | |
666 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
667 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
668 scavenge_exit.ticks()); | |
669 gc_task_manager()->print_task_time_stamps(); | |
670 } | |
671 | |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
672 #ifdef TRACESPINNING |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
673 ParallelTaskTerminator::print_termination_counts(); |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
674 #endif |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
457
diff
changeset
|
675 |
0 | 676 return !promotion_failure_occurred; |
677 } | |
678 | |
679 // This method iterates over all objects in the young generation, | |
680 // unforwarding markOops. It then restores any preserved mark oops, | |
681 // and clears the _preserved_mark_stack. | |
682 void PSScavenge::clean_up_failed_promotion() { | |
683 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
684 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
685 assert(promotion_failed(), "Sanity"); | |
686 | |
687 PSYoungGen* young_gen = heap->young_gen(); | |
688 | |
689 { | |
690 ResourceMark rm; | |
691 | |
692 // Unforward all pointers in the young gen. | |
693 PSPromotionFailedClosure unforward_closure; | |
694 young_gen->object_iterate(&unforward_closure); | |
695 | |
696 if (PrintGC && Verbose) { | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
697 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 698 } |
699 | |
700 // Restore any saved marks. | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
701 while (!_preserved_oop_stack.is_empty()) { |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
702 oop obj = _preserved_oop_stack.pop(); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
703 markOop mark = _preserved_mark_stack.pop(); |
0 | 704 obj->set_mark(mark); |
705 } | |
706 | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
707 // Clear the preserved mark and oop stack caches. |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
708 _preserved_mark_stack.clear(true); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
709 _preserved_oop_stack.clear(true); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
710 _promotion_failed = false; |
0 | 711 } |
712 | |
713 // Reset the PromotionFailureALot counters. | |
714 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
715 } | |
716 | |
717 // 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
|
718 // fails. Some markOops will need preservation, some will not. Note |
0 | 719 // that the entire eden is traversed after a failed promotion, with |
720 // all forwarded headers replaced by the default markOop. This means | |
721 // it is not neccessary to preserve most markOops. | |
722 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
|
723 _promotion_failed = true; |
0 | 724 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
1972
diff
changeset
|
725 // Should use per-worker private stakcs hetre rather than |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
1972
diff
changeset
|
726 // locking a common pair of stacks. |
0 | 727 ThreadCritical tc; |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
728 _preserved_oop_stack.push(obj); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1706
diff
changeset
|
729 _preserved_mark_stack.push(obj_mark); |
0 | 730 } |
731 } | |
732 | |
733 bool PSScavenge::should_attempt_scavenge() { | |
734 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
735 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
736 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
737 | |
738 if (UsePerfData) { | |
739 counters->update_scavenge_skipped(not_skipped); | |
740 } | |
741 | |
742 PSYoungGen* young_gen = heap->young_gen(); | |
743 PSOldGen* old_gen = heap->old_gen(); | |
744 | |
745 if (!ScavengeWithObjectsInToSpace) { | |
746 // Do not attempt to promote unless to_space is empty | |
747 if (!young_gen->to_space()->is_empty()) { | |
748 _consecutive_skipped_scavenges++; | |
749 if (UsePerfData) { | |
750 counters->update_scavenge_skipped(to_space_not_empty); | |
751 } | |
752 return false; | |
753 } | |
754 } | |
755 | |
756 // Test to see if the scavenge will likely fail. | |
757 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
758 | |
759 // A similar test is done in the policy's should_full_GC(). If this is | |
760 // changed, decide if that test should also be changed. | |
761 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
762 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
763 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
764 | |
765 if (PrintGCDetails && Verbose) { | |
766 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
767 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
768 " padded_average_promoted " SIZE_FORMAT | |
769 " free in old gen " SIZE_FORMAT, | |
770 (size_t) policy->average_promoted_in_bytes(), | |
771 (size_t) policy->padded_average_promoted_in_bytes(), | |
772 old_gen->free_in_bytes()); | |
773 if (young_gen->used_in_bytes() < | |
774 (size_t) policy->padded_average_promoted_in_bytes()) { | |
775 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
776 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
777 } | |
778 } | |
779 | |
780 if (result) { | |
781 _consecutive_skipped_scavenges = 0; | |
782 } else { | |
783 _consecutive_skipped_scavenges++; | |
784 if (UsePerfData) { | |
785 counters->update_scavenge_skipped(promoted_too_large); | |
786 } | |
787 } | |
788 return result; | |
789 } | |
790 | |
791 // Used to add tasks | |
792 GCTaskManager* const PSScavenge::gc_task_manager() { | |
793 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
794 "shouldn't return NULL"); | |
795 return ParallelScavengeHeap::gc_task_manager(); | |
796 } | |
797 | |
798 void PSScavenge::initialize() { | |
799 // Arguments must have been parsed | |
800 | |
801 if (AlwaysTenure) { | |
802 _tenuring_threshold = 0; | |
803 } else if (NeverTenure) { | |
804 _tenuring_threshold = markOopDesc::max_age + 1; | |
805 } else { | |
806 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
807 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
808 MaxTenuringThreshold; | |
809 } | |
810 | |
811 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
812 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
813 | |
814 PSYoungGen* young_gen = heap->young_gen(); | |
815 PSOldGen* old_gen = heap->old_gen(); | |
816 | |
817 // Set boundary between young_gen and old_gen | |
818 assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(), | |
819 "old above young"); | |
820 _young_generation_boundary = young_gen->eden_space()->bottom(); | |
821 | |
822 // Initialize ref handling object for scavenging. | |
823 MemRegion mr = young_gen->reserved(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
3979
diff
changeset
|
824 |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
825 _ref_processor = |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
826 new ReferenceProcessor(mr, // span |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
827 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
828 (int) ParallelGCThreads, // mt processing degree |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
829 true, // mt discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
830 (int) ParallelGCThreads, // mt discovery degree |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
831 true, // atomic_discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
832 NULL, // header provides liveness info |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2038
diff
changeset
|
833 false); // next field updates do not need write barrier |
0 | 834 |
835 // Cache the cardtable | |
836 BarrierSet* bs = Universe::heap()->barrier_set(); | |
837 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); | |
838 _card_table = (CardTableExtension*)bs; | |
839 | |
840 _counters = new CollectorCounters("PSScavenge", 0); | |
841 } |