Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 5964:21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
Summary: Make two G1 cmd line flags available in product builds: G1HeapWastePercent (previously called: G1OldReclaimableThresholdPercent) and G1MixedGCCountTarget (previous called: G1MaxMixedGCNum). Also changed the default of the former from 1% to 5% and the default for G1OldCSetRegionLiveThresholdPercent to 90%.
Reviewed-by: azeemj, jwilhelm, johnc
author | tonyp |
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date | Fri, 23 Mar 2012 10:53:19 -0400 |
parents | ab4422d0ed59 |
children | 9d679effd28c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/symbolTable.hpp" |
4909 | 27 #include "code/codeCache.hpp" |
1972 | 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
36 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
38 #include "gc_implementation/shared/spaceDecorator.hpp" | |
39 #include "gc_interface/gcCause.hpp" | |
40 #include "memory/collectorPolicy.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "memory/resourceArea.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "oops/oop.psgc.inline.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/threadCritical.hpp" | |
51 #include "runtime/vmThread.hpp" | |
52 #include "runtime/vm_operations.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/stack.inline.hpp" | |
0 | 55 |
56 | |
57 HeapWord* PSScavenge::_to_space_top_before_gc = NULL; | |
58 int PSScavenge::_consecutive_skipped_scavenges = 0; | |
59 ReferenceProcessor* PSScavenge::_ref_processor = NULL; | |
60 CardTableExtension* PSScavenge::_card_table = NULL; | |
61 bool PSScavenge::_survivor_overflow = false; | |
62 int PSScavenge::_tenuring_threshold = 0; | |
63 HeapWord* PSScavenge::_young_generation_boundary = NULL; | |
64 elapsedTimer PSScavenge::_accumulated_time; | |
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65 Stack<markOop> PSScavenge::_preserved_mark_stack; |
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66 Stack<oop> PSScavenge::_preserved_oop_stack; |
0 | 67 CollectorCounters* PSScavenge::_counters = NULL; |
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68 bool PSScavenge::_promotion_failed = false; |
0 | 69 |
70 // Define before use | |
71 class PSIsAliveClosure: public BoolObjectClosure { | |
72 public: | |
73 void do_object(oop p) { | |
74 assert(false, "Do not call."); | |
75 } | |
76 bool do_object_b(oop p) { | |
77 return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded(); | |
78 } | |
79 }; | |
80 | |
81 PSIsAliveClosure PSScavenge::_is_alive_closure; | |
82 | |
83 class PSKeepAliveClosure: public OopClosure { | |
84 protected: | |
85 MutableSpace* _to_space; | |
86 PSPromotionManager* _promotion_manager; | |
87 | |
88 public: | |
89 PSKeepAliveClosure(PSPromotionManager* pm) : _promotion_manager(pm) { | |
90 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
91 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
92 _to_space = heap->young_gen()->to_space(); | |
93 | |
94 assert(_promotion_manager != NULL, "Sanity"); | |
95 } | |
96 | |
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97 template <class T> void do_oop_work(T* p) { |
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98 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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99 assert ((oopDesc::load_decode_heap_oop_not_null(p))->is_oop(), |
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100 "expected an oop while scanning weak refs"); |
0 | 101 |
102 // Weak refs may be visited more than once. | |
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103 if (PSScavenge::should_scavenge(p, _to_space)) { |
4909 | 104 PSScavenge::copy_and_push_safe_barrier<T, /*promote_immediately=*/false>(_promotion_manager, p); |
0 | 105 } |
106 } | |
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107 virtual void do_oop(oop* p) { PSKeepAliveClosure::do_oop_work(p); } |
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108 virtual void do_oop(narrowOop* p) { PSKeepAliveClosure::do_oop_work(p); } |
0 | 109 }; |
110 | |
111 class PSEvacuateFollowersClosure: public VoidClosure { | |
112 private: | |
113 PSPromotionManager* _promotion_manager; | |
114 public: | |
115 PSEvacuateFollowersClosure(PSPromotionManager* pm) : _promotion_manager(pm) {} | |
116 | |
113
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117 virtual void do_void() { |
0 | 118 assert(_promotion_manager != NULL, "Sanity"); |
119 _promotion_manager->drain_stacks(true); | |
120 guarantee(_promotion_manager->stacks_empty(), | |
121 "stacks should be empty at this point"); | |
122 } | |
123 }; | |
124 | |
125 class PSPromotionFailedClosure : public ObjectClosure { | |
126 virtual void do_object(oop obj) { | |
127 if (obj->is_forwarded()) { | |
128 obj->init_mark(); | |
129 } | |
130 } | |
131 }; | |
132 | |
133 class PSRefProcTaskProxy: public GCTask { | |
134 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
135 ProcessTask & _rp_task; | |
136 uint _work_id; | |
137 public: | |
138 PSRefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
139 : _rp_task(rp_task), | |
140 _work_id(work_id) | |
141 { } | |
142 | |
143 private: | |
144 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
145 virtual void do_it(GCTaskManager* manager, uint which); | |
146 }; | |
147 | |
148 void PSRefProcTaskProxy::do_it(GCTaskManager* manager, uint which) | |
149 { | |
150 PSPromotionManager* promotion_manager = | |
151 PSPromotionManager::gc_thread_promotion_manager(which); | |
152 assert(promotion_manager != NULL, "sanity check"); | |
153 PSKeepAliveClosure keep_alive(promotion_manager); | |
154 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
155 PSIsAliveClosure is_alive; | |
156 _rp_task.work(_work_id, is_alive, keep_alive, evac_followers); | |
157 } | |
158 | |
159 class PSRefEnqueueTaskProxy: public GCTask { | |
160 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
161 EnqueueTask& _enq_task; | |
162 uint _work_id; | |
163 | |
164 public: | |
165 PSRefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
166 : _enq_task(enq_task), | |
167 _work_id(work_id) | |
168 { } | |
169 | |
170 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
171 virtual void do_it(GCTaskManager* manager, uint which) | |
172 { | |
173 _enq_task.work(_work_id); | |
174 } | |
175 }; | |
176 | |
177 class PSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
178 virtual void execute(ProcessTask& task); | |
179 virtual void execute(EnqueueTask& task); | |
180 }; | |
181 | |
182 void PSRefProcTaskExecutor::execute(ProcessTask& task) | |
183 { | |
184 GCTaskQueue* q = GCTaskQueue::create(); | |
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185 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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186 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 187 q->enqueue(new PSRefProcTaskProxy(task, i)); |
188 } | |
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189 ParallelTaskTerminator terminator(manager->active_workers(), |
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190 (TaskQueueSetSuper*) PSPromotionManager::stack_array_depth()); |
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191 if (task.marks_oops_alive() && manager->active_workers() > 1) { |
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192 for (uint j = 0; j < manager->active_workers(); j++) { |
0 | 193 q->enqueue(new StealTask(&terminator)); |
194 } | |
195 } | |
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196 manager->execute_and_wait(q); |
0 | 197 } |
198 | |
199 | |
200 void PSRefProcTaskExecutor::execute(EnqueueTask& task) | |
201 { | |
202 GCTaskQueue* q = GCTaskQueue::create(); | |
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203 GCTaskManager* manager = ParallelScavengeHeap::gc_task_manager(); |
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204 for(uint i=0; i < manager->active_workers(); i++) { |
0 | 205 q->enqueue(new PSRefEnqueueTaskProxy(task, i)); |
206 } | |
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207 manager->execute_and_wait(q); |
0 | 208 } |
209 | |
210 // This method contains all heap specific policy for invoking scavenge. | |
211 // PSScavenge::invoke_no_policy() will do nothing but attempt to | |
212 // scavenge. It will not clean up after failed promotions, bail out if | |
213 // we've exceeded policy time limits, or any other special behavior. | |
214 // All such policy should be placed here. | |
215 // | |
216 // Note that this method should only be called from the vm_thread while | |
217 // at a safepoint! | |
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218 bool PSScavenge::invoke() { |
0 | 219 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
220 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
221 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
222 | |
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223 ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap(); |
0 | 224 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
225 | |
226 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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227 IsGCActiveMark mark; |
0 | 228 |
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229 const bool scavenge_done = PSScavenge::invoke_no_policy(); |
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230 const bool need_full_gc = !scavenge_done || |
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231 policy->should_full_GC(heap->old_gen()->free_in_bytes()); |
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232 bool full_gc_done = false; |
0 | 233 |
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234 if (UsePerfData) { |
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235 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); |
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236 const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped; |
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237 counters->update_full_follows_scavenge(ffs_val); |
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238 } |
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239 |
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240 if (need_full_gc) { |
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241 GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy); |
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242 CollectorPolicy* cp = heap->collector_policy(); |
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243 const bool clear_all_softrefs = cp->should_clear_all_soft_refs(); |
0 | 244 |
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245 if (UseParallelOldGC) { |
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246 full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs); |
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247 } else { |
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248 full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs); |
0 | 249 } |
250 } | |
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251 |
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252 return full_gc_done; |
0 | 253 } |
254 | |
255 // This method contains no policy. You should probably | |
256 // be calling invoke() instead. | |
257 bool PSScavenge::invoke_no_policy() { | |
258 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
259 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
260 | |
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261 assert(_preserved_mark_stack.is_empty(), "should be empty"); |
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262 assert(_preserved_oop_stack.is_empty(), "should be empty"); |
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263 |
0 | 264 TimeStamp scavenge_entry; |
265 TimeStamp scavenge_midpoint; | |
266 TimeStamp scavenge_exit; | |
267 | |
268 scavenge_entry.update(); | |
269 | |
270 if (GC_locker::check_active_before_gc()) { | |
271 return false; | |
272 } | |
273 | |
274 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
275 GCCause::Cause gc_cause = heap->gc_cause(); | |
276 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
277 | |
278 // Check for potential problems. | |
279 if (!should_attempt_scavenge()) { | |
280 return false; | |
281 } | |
282 | |
283 bool promotion_failure_occurred = false; | |
284 | |
285 PSYoungGen* young_gen = heap->young_gen(); | |
286 PSOldGen* old_gen = heap->old_gen(); | |
287 PSPermGen* perm_gen = heap->perm_gen(); | |
288 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
289 heap->increment_total_collections(); | |
290 | |
291 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
292 | |
293 if ((gc_cause != GCCause::_java_lang_system_gc) || | |
294 UseAdaptiveSizePolicyWithSystemGC) { | |
295 // Gather the feedback data for eden occupancy. | |
296 young_gen->eden_space()->accumulate_statistics(); | |
297 } | |
298 | |
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299 if (ZapUnusedHeapArea) { |
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300 // Save information needed to minimize mangling |
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301 heap->record_gen_tops_before_GC(); |
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302 } |
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303 |
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304 heap->print_heap_before_gc(); |
0 | 305 |
306 assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity"); | |
307 assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity"); | |
308 | |
309 size_t prev_used = heap->used(); | |
310 assert(promotion_failed() == false, "Sanity"); | |
311 | |
312 // Fill in TLABs | |
313 heap->accumulate_statistics_all_tlabs(); | |
314 heap->ensure_parsability(true); // retire TLABs | |
315 | |
316 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
317 HandleMark hm; // Discard invalid handles created during verification | |
318 gclog_or_tty->print(" VerifyBeforeGC:"); | |
319 Universe::verify(true); | |
320 } | |
321 | |
322 { | |
323 ResourceMark rm; | |
324 HandleMark hm; | |
325 | |
326 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
327 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
328 TraceTime t1("GC", PrintGC, !PrintGCDetails, gclog_or_tty); | |
329 TraceCollectorStats tcs(counters()); | |
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330 TraceMemoryManagerStats tms(false /* not full GC */,gc_cause); |
0 | 331 |
332 if (TraceGen0Time) accumulated_time()->start(); | |
333 | |
334 // Let the size policy know we're starting | |
335 size_policy->minor_collection_begin(); | |
336 | |
337 // Verify the object start arrays. | |
338 if (VerifyObjectStartArray && | |
339 VerifyBeforeGC) { | |
340 old_gen->verify_object_start_array(); | |
341 perm_gen->verify_object_start_array(); | |
342 } | |
343 | |
344 // Verify no unmarked old->young roots | |
345 if (VerifyRememberedSets) { | |
346 CardTableExtension::verify_all_young_refs_imprecise(); | |
347 } | |
348 | |
349 if (!ScavengeWithObjectsInToSpace) { | |
350 assert(young_gen->to_space()->is_empty(), | |
351 "Attempt to scavenge with live objects in to_space"); | |
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352 young_gen->to_space()->clear(SpaceDecorator::Mangle); |
0 | 353 } else if (ZapUnusedHeapArea) { |
354 young_gen->to_space()->mangle_unused_area(); | |
355 } | |
356 save_to_space_top_before_gc(); | |
357 | |
358 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
359 | |
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360 reference_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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361 reference_processor()->setup_policy(false); |
0 | 362 |
363 // We track how much was promoted to the next generation for | |
364 // the AdaptiveSizePolicy. | |
365 size_t old_gen_used_before = old_gen->used_in_bytes(); | |
366 | |
367 // For PrintGCDetails | |
368 size_t young_gen_used_before = young_gen->used_in_bytes(); | |
369 | |
370 // Reset our survivor overflow. | |
371 set_survivor_overflow(false); | |
372 | |
373 // We need to save the old/perm top values before | |
374 // creating the promotion_manager. We pass the top | |
375 // values to the card_table, to prevent it from | |
376 // straying into the promotion labs. | |
377 HeapWord* old_top = old_gen->object_space()->top(); | |
378 HeapWord* perm_top = perm_gen->object_space()->top(); | |
379 | |
380 // Release all previously held resources | |
381 gc_task_manager()->release_all_resources(); | |
382 | |
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383 // Set the number of GC threads to be used in this collection |
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384 gc_task_manager()->set_active_gang(); |
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385 gc_task_manager()->task_idle_workers(); |
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386 // Get the active number of workers here and use that value |
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387 // throughout the methods. |
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388 uint active_workers = gc_task_manager()->active_workers(); |
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389 heap->set_par_threads(active_workers); |
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390 |
0 | 391 PSPromotionManager::pre_scavenge(); |
392 | |
393 // We'll use the promotion manager again later. | |
394 PSPromotionManager* promotion_manager = PSPromotionManager::vm_thread_promotion_manager(); | |
395 { | |
396 // TraceTime("Roots"); | |
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397 ParallelScavengeHeap::ParStrongRootsScope psrs; |
0 | 398 |
399 GCTaskQueue* q = GCTaskQueue::create(); | |
400 | |
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401 uint stripe_total = active_workers; |
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402 for(uint i=0; i < stripe_total; i++) { |
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403 q->enqueue(new OldToYoungRootsTask(old_gen, old_top, i, stripe_total)); |
0 | 404 } |
405 | |
406 q->enqueue(new SerialOldToYoungRootsTask(perm_gen, perm_top)); | |
407 | |
408 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::universe)); | |
409 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jni_handles)); | |
410 // We scan the thread roots in parallel | |
411 Threads::create_thread_roots_tasks(q); | |
412 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::object_synchronizer)); | |
413 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::flat_profiler)); | |
414 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::management)); | |
415 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::system_dictionary)); | |
416 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::jvmti)); | |
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417 q->enqueue(new ScavengeRootsTask(ScavengeRootsTask::code_cache)); |
0 | 418 |
419 ParallelTaskTerminator terminator( | |
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420 active_workers, |
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421 (TaskQueueSetSuper*) promotion_manager->stack_array_depth()); |
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422 if (active_workers > 1) { |
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423 for (uint j = 0; j < active_workers; j++) { |
0 | 424 q->enqueue(new StealTask(&terminator)); |
425 } | |
426 } | |
427 | |
428 gc_task_manager()->execute_and_wait(q); | |
429 } | |
430 | |
431 scavenge_midpoint.update(); | |
432 | |
433 // Process reference objects discovered during scavenge | |
434 { | |
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435 reference_processor()->setup_policy(false); // not always_clear |
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436 reference_processor()->set_active_mt_degree(active_workers); |
0 | 437 PSKeepAliveClosure keep_alive(promotion_manager); |
438 PSEvacuateFollowersClosure evac_followers(promotion_manager); | |
439 if (reference_processor()->processing_is_mt()) { | |
440 PSRefProcTaskExecutor task_executor; | |
441 reference_processor()->process_discovered_references( | |
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442 &_is_alive_closure, &keep_alive, &evac_followers, &task_executor); |
0 | 443 } else { |
444 reference_processor()->process_discovered_references( | |
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445 &_is_alive_closure, &keep_alive, &evac_followers, NULL); |
0 | 446 } |
447 } | |
448 | |
449 // Enqueue reference objects discovered during scavenge. | |
450 if (reference_processor()->processing_is_mt()) { | |
451 PSRefProcTaskExecutor task_executor; | |
452 reference_processor()->enqueue_discovered_references(&task_executor); | |
453 } else { | |
454 reference_processor()->enqueue_discovered_references(NULL); | |
455 } | |
456 | |
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457 if (!JavaObjectsInPerm) { |
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458 // Unlink any dead interned Strings |
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459 StringTable::unlink(&_is_alive_closure); |
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460 // Process the remaining live ones |
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461 PSScavengeRootsClosure root_closure(promotion_manager); |
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462 StringTable::oops_do(&root_closure); |
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463 } |
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464 |
0 | 465 // Finally, flush the promotion_manager's labs, and deallocate its stacks. |
466 PSPromotionManager::post_scavenge(); | |
467 | |
468 promotion_failure_occurred = promotion_failed(); | |
469 if (promotion_failure_occurred) { | |
470 clean_up_failed_promotion(); | |
471 if (PrintGC) { | |
472 gclog_or_tty->print("--"); | |
473 } | |
474 } | |
475 | |
476 // Let the size policy know we're done. Note that we count promotion | |
477 // failure cleanup time as part of the collection (otherwise, we're | |
478 // implicitly saying it's mutator time). | |
479 size_policy->minor_collection_end(gc_cause); | |
480 | |
481 if (!promotion_failure_occurred) { | |
482 // Swap the survivor spaces. | |
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483 |
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484 |
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485 young_gen->eden_space()->clear(SpaceDecorator::Mangle); |
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486 young_gen->from_space()->clear(SpaceDecorator::Mangle); |
0 | 487 young_gen->swap_spaces(); |
488 | |
489 size_t survived = young_gen->from_space()->used_in_bytes(); | |
490 size_t promoted = old_gen->used_in_bytes() - old_gen_used_before; | |
491 size_policy->update_averages(_survivor_overflow, survived, promoted); | |
492 | |
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493 // A successful scavenge should restart the GC time limit count which is |
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494 // for full GC's. |
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495 size_policy->reset_gc_overhead_limit_count(); |
0 | 496 if (UseAdaptiveSizePolicy) { |
497 // Calculate the new survivor size and tenuring threshold | |
498 | |
499 if (PrintAdaptiveSizePolicy) { | |
500 gclog_or_tty->print("AdaptiveSizeStart: "); | |
501 gclog_or_tty->stamp(); | |
502 gclog_or_tty->print_cr(" collection: %d ", | |
503 heap->total_collections()); | |
504 | |
505 if (Verbose) { | |
506 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
507 " perm_gen_capacity: %d ", | |
508 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
509 perm_gen->capacity_in_bytes()); | |
510 } | |
511 } | |
512 | |
513 | |
514 if (UsePerfData) { | |
515 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
516 counters->update_old_eden_size( | |
517 size_policy->calculated_eden_size_in_bytes()); | |
518 counters->update_old_promo_size( | |
519 size_policy->calculated_promo_size_in_bytes()); | |
520 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
521 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
522 counters->update_survived(survived); | |
523 counters->update_promoted(promoted); | |
524 counters->update_survivor_overflowed(_survivor_overflow); | |
525 } | |
526 | |
527 size_t survivor_limit = | |
528 size_policy->max_survivor_size(young_gen->max_size()); | |
529 _tenuring_threshold = | |
530 size_policy->compute_survivor_space_size_and_threshold( | |
531 _survivor_overflow, | |
532 _tenuring_threshold, | |
533 survivor_limit); | |
534 | |
535 if (PrintTenuringDistribution) { | |
536 gclog_or_tty->cr(); | |
537 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)", | |
538 size_policy->calculated_survivor_size_in_bytes(), | |
539 _tenuring_threshold, MaxTenuringThreshold); | |
540 } | |
541 | |
542 if (UsePerfData) { | |
543 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
544 counters->update_tenuring_threshold(_tenuring_threshold); | |
545 counters->update_survivor_size_counters(); | |
546 } | |
547 | |
548 // Do call at minor collections? | |
549 // Don't check if the size_policy is ready at this | |
550 // level. Let the size_policy check that internally. | |
551 if (UseAdaptiveSizePolicy && | |
552 UseAdaptiveGenerationSizePolicyAtMinorCollection && | |
553 ((gc_cause != GCCause::_java_lang_system_gc) || | |
554 UseAdaptiveSizePolicyWithSystemGC)) { | |
555 | |
556 // Calculate optimial free space amounts | |
557 assert(young_gen->max_size() > | |
558 young_gen->from_space()->capacity_in_bytes() + | |
559 young_gen->to_space()->capacity_in_bytes(), | |
560 "Sizes of space in young gen are out-of-bounds"); | |
561 size_t max_eden_size = young_gen->max_size() - | |
562 young_gen->from_space()->capacity_in_bytes() - | |
563 young_gen->to_space()->capacity_in_bytes(); | |
564 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
565 young_gen->eden_space()->used_in_bytes(), | |
566 old_gen->used_in_bytes(), | |
567 perm_gen->used_in_bytes(), | |
568 young_gen->eden_space()->capacity_in_bytes(), | |
569 old_gen->max_gen_size(), | |
570 max_eden_size, | |
571 false /* full gc*/, | |
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572 gc_cause, |
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573 heap->collector_policy()); |
0 | 574 |
575 } | |
576 // Resize the young generation at every collection | |
577 // even if new sizes have not been calculated. This is | |
578 // to allow resizes that may have been inhibited by the | |
579 // relative location of the "to" and "from" spaces. | |
580 | |
581 // Resizing the old gen at minor collects can cause increases | |
582 // that don't feed back to the generation sizing policy until | |
583 // a major collection. Don't resize the old gen here. | |
584 | |
585 heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), | |
586 size_policy->calculated_survivor_size_in_bytes()); | |
587 | |
588 if (PrintAdaptiveSizePolicy) { | |
589 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
590 heap->total_collections()); | |
591 } | |
592 } | |
593 | |
594 // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can | |
595 // cause the change of the heap layout. Make sure eden is reshaped if that's the case. | |
596 // Also update() will case adaptive NUMA chunk resizing. | |
597 assert(young_gen->eden_space()->is_empty(), "eden space should be empty now"); | |
598 young_gen->eden_space()->update(); | |
599 | |
600 heap->gc_policy_counters()->update_counters(); | |
601 | |
602 heap->resize_all_tlabs(); | |
603 | |
604 assert(young_gen->to_space()->is_empty(), "to space should be empty now"); | |
605 } | |
606 | |
607 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
608 | |
609 NOT_PRODUCT(reference_processor()->verify_no_references_recorded()); | |
610 | |
4909 | 611 CodeCache::prune_scavenge_root_nmethods(); |
612 | |
0 | 613 // Re-verify object start arrays |
614 if (VerifyObjectStartArray && | |
615 VerifyAfterGC) { | |
616 old_gen->verify_object_start_array(); | |
617 perm_gen->verify_object_start_array(); | |
618 } | |
619 | |
620 // Verify all old -> young cards are now precise | |
621 if (VerifyRememberedSets) { | |
622 // Precise verification will give false positives. Until this is fixed, | |
623 // use imprecise verification. | |
624 // CardTableExtension::verify_all_young_refs_precise(); | |
625 CardTableExtension::verify_all_young_refs_imprecise(); | |
626 } | |
627 | |
628 if (TraceGen0Time) accumulated_time()->stop(); | |
629 | |
630 if (PrintGC) { | |
631 if (PrintGCDetails) { | |
632 // Don't print a GC timestamp here. This is after the GC so | |
633 // would be confusing. | |
634 young_gen->print_used_change(young_gen_used_before); | |
635 } | |
636 heap->print_heap_change(prev_used); | |
637 } | |
638 | |
639 // Track memory usage and detect low memory | |
640 MemoryService::track_memory_usage(); | |
641 heap->update_counters(); | |
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642 |
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643 gc_task_manager()->release_idle_workers(); |
0 | 644 } |
645 | |
646 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
647 HandleMark hm; // Discard invalid handles created during verification | |
648 gclog_or_tty->print(" VerifyAfterGC:"); | |
649 Universe::verify(false); | |
650 } | |
651 | |
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652 heap->print_heap_after_gc(); |
0 | 653 |
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654 if (ZapUnusedHeapArea) { |
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655 young_gen->eden_space()->check_mangled_unused_area_complete(); |
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656 young_gen->from_space()->check_mangled_unused_area_complete(); |
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657 young_gen->to_space()->check_mangled_unused_area_complete(); |
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658 } |
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659 |
0 | 660 scavenge_exit.update(); |
661 | |
662 if (PrintGCTaskTimeStamps) { | |
663 tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " INT64_FORMAT, | |
664 scavenge_entry.ticks(), scavenge_midpoint.ticks(), | |
665 scavenge_exit.ticks()); | |
666 gc_task_manager()->print_task_time_stamps(); | |
667 } | |
668 | |
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669 #ifdef TRACESPINNING |
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670 ParallelTaskTerminator::print_termination_counts(); |
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671 #endif |
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672 |
0 | 673 return !promotion_failure_occurred; |
674 } | |
675 | |
676 // This method iterates over all objects in the young generation, | |
677 // unforwarding markOops. It then restores any preserved mark oops, | |
678 // and clears the _preserved_mark_stack. | |
679 void PSScavenge::clean_up_failed_promotion() { | |
680 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
681 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
682 assert(promotion_failed(), "Sanity"); | |
683 | |
684 PSYoungGen* young_gen = heap->young_gen(); | |
685 | |
686 { | |
687 ResourceMark rm; | |
688 | |
689 // Unforward all pointers in the young gen. | |
690 PSPromotionFailedClosure unforward_closure; | |
691 young_gen->object_iterate(&unforward_closure); | |
692 | |
693 if (PrintGC && Verbose) { | |
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694 gclog_or_tty->print_cr("Restoring %d marks", _preserved_oop_stack.size()); |
0 | 695 } |
696 | |
697 // Restore any saved marks. | |
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698 while (!_preserved_oop_stack.is_empty()) { |
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699 oop obj = _preserved_oop_stack.pop(); |
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700 markOop mark = _preserved_mark_stack.pop(); |
0 | 701 obj->set_mark(mark); |
702 } | |
703 | |
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704 // Clear the preserved mark and oop stack caches. |
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705 _preserved_mark_stack.clear(true); |
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706 _preserved_oop_stack.clear(true); |
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707 _promotion_failed = false; |
0 | 708 } |
709 | |
710 // Reset the PromotionFailureALot counters. | |
711 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
712 } | |
713 | |
714 // This method is called whenever an attempt to promote an object | |
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715 // fails. Some markOops will need preservation, some will not. Note |
0 | 716 // that the entire eden is traversed after a failed promotion, with |
717 // all forwarded headers replaced by the default markOop. This means | |
718 // it is not neccessary to preserve most markOops. | |
719 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | |
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720 _promotion_failed = true; |
0 | 721 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
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722 // Should use per-worker private stakcs hetre rather than |
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723 // locking a common pair of stacks. |
0 | 724 ThreadCritical tc; |
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725 _preserved_oop_stack.push(obj); |
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726 _preserved_mark_stack.push(obj_mark); |
0 | 727 } |
728 } | |
729 | |
730 bool PSScavenge::should_attempt_scavenge() { | |
731 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
732 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
733 PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters(); | |
734 | |
735 if (UsePerfData) { | |
736 counters->update_scavenge_skipped(not_skipped); | |
737 } | |
738 | |
739 PSYoungGen* young_gen = heap->young_gen(); | |
740 PSOldGen* old_gen = heap->old_gen(); | |
741 | |
742 if (!ScavengeWithObjectsInToSpace) { | |
743 // Do not attempt to promote unless to_space is empty | |
744 if (!young_gen->to_space()->is_empty()) { | |
745 _consecutive_skipped_scavenges++; | |
746 if (UsePerfData) { | |
747 counters->update_scavenge_skipped(to_space_not_empty); | |
748 } | |
749 return false; | |
750 } | |
751 } | |
752 | |
753 // Test to see if the scavenge will likely fail. | |
754 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
755 | |
756 // A similar test is done in the policy's should_full_GC(). If this is | |
757 // changed, decide if that test should also be changed. | |
758 size_t avg_promoted = (size_t) policy->padded_average_promoted_in_bytes(); | |
759 size_t promotion_estimate = MIN2(avg_promoted, young_gen->used_in_bytes()); | |
760 bool result = promotion_estimate < old_gen->free_in_bytes(); | |
761 | |
762 if (PrintGCDetails && Verbose) { | |
763 gclog_or_tty->print(result ? " do scavenge: " : " skip scavenge: "); | |
764 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
765 " padded_average_promoted " SIZE_FORMAT | |
766 " free in old gen " SIZE_FORMAT, | |
767 (size_t) policy->average_promoted_in_bytes(), | |
768 (size_t) policy->padded_average_promoted_in_bytes(), | |
769 old_gen->free_in_bytes()); | |
770 if (young_gen->used_in_bytes() < | |
771 (size_t) policy->padded_average_promoted_in_bytes()) { | |
772 gclog_or_tty->print_cr(" padded_promoted_average is greater" | |
773 " than maximum promotion = " SIZE_FORMAT, young_gen->used_in_bytes()); | |
774 } | |
775 } | |
776 | |
777 if (result) { | |
778 _consecutive_skipped_scavenges = 0; | |
779 } else { | |
780 _consecutive_skipped_scavenges++; | |
781 if (UsePerfData) { | |
782 counters->update_scavenge_skipped(promoted_too_large); | |
783 } | |
784 } | |
785 return result; | |
786 } | |
787 | |
788 // Used to add tasks | |
789 GCTaskManager* const PSScavenge::gc_task_manager() { | |
790 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
791 "shouldn't return NULL"); | |
792 return ParallelScavengeHeap::gc_task_manager(); | |
793 } | |
794 | |
795 void PSScavenge::initialize() { | |
796 // Arguments must have been parsed | |
797 | |
798 if (AlwaysTenure) { | |
799 _tenuring_threshold = 0; | |
800 } else if (NeverTenure) { | |
801 _tenuring_threshold = markOopDesc::max_age + 1; | |
802 } else { | |
803 // We want to smooth out our startup times for the AdaptiveSizePolicy | |
804 _tenuring_threshold = (UseAdaptiveSizePolicy) ? InitialTenuringThreshold : | |
805 MaxTenuringThreshold; | |
806 } | |
807 | |
808 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
809 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
810 | |
811 PSYoungGen* young_gen = heap->young_gen(); | |
812 PSOldGen* old_gen = heap->old_gen(); | |
813 PSPermGen* perm_gen = heap->perm_gen(); | |
814 | |
815 // Set boundary between young_gen and old_gen | |
816 assert(perm_gen->reserved().end() <= old_gen->object_space()->bottom(), | |
817 "perm above old"); | |
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(); | |
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824 |
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825 _ref_processor = |
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826 new ReferenceProcessor(mr, // span |
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827 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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828 (int) ParallelGCThreads, // mt processing degree |
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829 true, // mt discovery |
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830 (int) ParallelGCThreads, // mt discovery degree |
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831 true, // atomic_discovery |
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832 NULL, // header provides liveness info |
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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 } |