Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 7200:dd38cfd12c3a
8004319: test/gc/7168848/HumongousAlloc.java fails after 7172640
Reviewed-by: kvn, johnc
author | twisti |
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date | Mon, 03 Dec 2012 15:48:49 -0800 |
parents | 4202510ee0fe |
children | d0aa87f04bd5 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 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" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
31 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
32 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
34 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
35 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
36 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
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38 #include "gc_implementation/shared/markSweep.hpp" |
1972 | 39 #include "gc_implementation/shared/spaceDecorator.hpp" |
40 #include "gc_interface/gcCause.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "runtime/biasedLocking.hpp" | |
46 #include "runtime/fprofiler.hpp" | |
47 #include "runtime/safepoint.hpp" | |
48 #include "runtime/vmThread.hpp" | |
49 #include "services/management.hpp" | |
50 #include "services/memoryService.hpp" | |
51 #include "utilities/events.hpp" | |
52 #include "utilities/stack.inline.hpp" | |
0 | 53 |
54 elapsedTimer PSMarkSweep::_accumulated_time; | |
55 jlong PSMarkSweep::_time_of_last_gc = 0; | |
56 CollectorCounters* PSMarkSweep::_counters = NULL; | |
57 | |
58 void PSMarkSweep::initialize() { | |
59 MemRegion mr = Universe::heap()->reserved_region(); | |
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60 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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61 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 62 } |
63 | |
64 // This method contains all heap specific policy for invoking mark sweep. | |
65 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
66 // the heap. It will do nothing further. If we need to bail out for policy | |
67 // reasons, scavenge before full gc, or any other specialized behavior, it | |
68 // needs to be added here. | |
69 // | |
70 // Note that this method should only be called from the vm_thread while | |
71 // at a safepoint! | |
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72 // |
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73 // Note that the all_soft_refs_clear flag in the collector policy |
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74 // may be true because this method can be called without intervening |
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75 // activity. For example when the heap space is tight and full measure |
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76 // are being taken to free space. |
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77 |
0 | 78 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
79 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
80 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
81 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
82 | |
83 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
84 GCCause::Cause gc_cause = heap->gc_cause(); | |
85 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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86 IsGCActiveMark mark; |
0 | 87 |
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88 if (ScavengeBeforeFullGC) { |
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89 PSScavenge::invoke_no_policy(); |
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90 } |
0 | 91 |
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92 const bool clear_all_soft_refs = |
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93 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 94 |
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95 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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96 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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97 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 98 } |
99 | |
100 // This method contains no policy. You should probably | |
101 // be calling invoke() instead. | |
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102 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 103 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
104 assert(ref_processor() != NULL, "Sanity"); | |
105 | |
106 if (GC_locker::check_active_before_gc()) { | |
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107 return false; |
0 | 108 } |
109 | |
110 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
111 GCCause::Cause gc_cause = heap->gc_cause(); | |
112 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
113 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
114 | |
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115 // The scope of casr should end after code that can change |
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116 // CollectorPolicy::_should_clear_all_soft_refs. |
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117 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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118 |
0 | 119 PSYoungGen* young_gen = heap->young_gen(); |
120 PSOldGen* old_gen = heap->old_gen(); | |
121 | |
122 // Increment the invocation count | |
123 heap->increment_total_collections(true /* full */); | |
124 | |
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125 // Save information needed to minimize mangling |
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126 heap->record_gen_tops_before_GC(); |
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127 |
0 | 128 // We need to track unique mark sweep invocations as well. |
129 _total_invocations++; | |
130 | |
131 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
132 | |
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133 heap->print_heap_before_gc(); |
0 | 134 |
135 // Fill in TLABs | |
136 heap->accumulate_statistics_all_tlabs(); | |
137 heap->ensure_parsability(true); // retire TLABs | |
138 | |
139 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
140 HandleMark hm; // Discard invalid handles created during verification | |
141 gclog_or_tty->print(" VerifyBeforeGC:"); | |
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142 Universe::verify(); |
0 | 143 } |
144 | |
145 // Verify object start arrays | |
146 if (VerifyObjectStartArray && | |
147 VerifyBeforeGC) { | |
148 old_gen->verify_object_start_array(); | |
149 } | |
150 | |
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151 heap->pre_full_gc_dump(); |
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152 |
0 | 153 // Filled in below to track the state of the young gen after the collection. |
154 bool eden_empty; | |
155 bool survivors_empty; | |
156 bool young_gen_empty; | |
157 | |
158 { | |
159 HandleMark hm; | |
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160 |
0 | 161 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
162 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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163 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 164 TraceCollectorStats tcs(counters()); |
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165 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 166 |
167 if (TraceGen1Time) accumulated_time()->start(); | |
168 | |
169 // Let the size policy know we're starting | |
170 size_policy->major_collection_begin(); | |
171 | |
172 CodeCache::gc_prologue(); | |
173 Threads::gc_prologue(); | |
174 BiasedLocking::preserve_marks(); | |
175 | |
176 // Capture heap size before collection for printing. | |
177 size_t prev_used = heap->used(); | |
178 | |
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179 // Capture metadata size before collection for sizing. |
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180 size_t metadata_prev_used = MetaspaceAux::used_in_bytes(); |
0 | 181 |
182 // For PrintGCDetails | |
183 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
184 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
185 | |
186 allocate_stacks(); | |
187 | |
188 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
189 | |
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190 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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191 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 192 |
193 mark_sweep_phase1(clear_all_softrefs); | |
194 | |
195 mark_sweep_phase2(); | |
196 | |
197 // Don't add any more derived pointers during phase3 | |
198 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
199 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
200 | |
201 mark_sweep_phase3(); | |
202 | |
203 mark_sweep_phase4(); | |
204 | |
205 restore_marks(); | |
206 | |
207 deallocate_stacks(); | |
208 | |
263
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209 if (ZapUnusedHeapArea) { |
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210 // Do a complete mangle (top to end) because the usage for |
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211 // scratch does not maintain a top pointer. |
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212 young_gen->to_space()->mangle_unused_area_complete(); |
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213 } |
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214 |
0 | 215 eden_empty = young_gen->eden_space()->is_empty(); |
216 if (!eden_empty) { | |
217 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
218 } | |
219 | |
220 // Update heap occupancy information which is used as | |
221 // input to soft ref clearing policy at the next gc. | |
222 Universe::update_heap_info_at_gc(); | |
223 | |
224 survivors_empty = young_gen->from_space()->is_empty() && | |
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225 young_gen->to_space()->is_empty(); |
0 | 226 young_gen_empty = eden_empty && survivors_empty; |
227 | |
228 BarrierSet* bs = heap->barrier_set(); | |
229 if (bs->is_a(BarrierSet::ModRef)) { | |
230 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
231 MemRegion old_mr = heap->old_gen()->reserved(); | |
232 if (young_gen_empty) { | |
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233 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 234 } else { |
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235 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 236 } |
237 } | |
238 | |
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239 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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240 ClassLoaderDataGraph::purge(); |
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241 |
0 | 242 BiasedLocking::restore_marks(); |
243 Threads::gc_epilogue(); | |
244 CodeCache::gc_epilogue(); | |
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245 JvmtiExport::gc_epilogue(); |
0 | 246 |
247 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
248 | |
249 ref_processor()->enqueue_discovered_references(NULL); | |
250 | |
251 // Update time of last GC | |
252 reset_millis_since_last_gc(); | |
253 | |
254 // Let the size policy know we're done | |
255 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
256 | |
257 if (UseAdaptiveSizePolicy) { | |
258 | |
259 if (PrintAdaptiveSizePolicy) { | |
260 gclog_or_tty->print("AdaptiveSizeStart: "); | |
261 gclog_or_tty->stamp(); | |
262 gclog_or_tty->print_cr(" collection: %d ", | |
263 heap->total_collections()); | |
264 if (Verbose) { | |
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265 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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266 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 267 } |
268 } | |
269 | |
270 // Don't check if the size_policy is ready here. Let | |
271 // the size_policy check that internally. | |
272 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
273 ((gc_cause != GCCause::_java_lang_system_gc) || | |
274 UseAdaptiveSizePolicyWithSystemGC)) { | |
275 // Calculate optimal free space amounts | |
276 assert(young_gen->max_size() > | |
277 young_gen->from_space()->capacity_in_bytes() + | |
278 young_gen->to_space()->capacity_in_bytes(), | |
279 "Sizes of space in young gen are out-of-bounds"); | |
280 size_t max_eden_size = young_gen->max_size() - | |
281 young_gen->from_space()->capacity_in_bytes() - | |
282 young_gen->to_space()->capacity_in_bytes(); | |
283 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
284 young_gen->eden_space()->used_in_bytes(), | |
285 old_gen->used_in_bytes(), | |
286 young_gen->eden_space()->capacity_in_bytes(), | |
287 old_gen->max_gen_size(), | |
288 max_eden_size, | |
289 true /* full gc*/, | |
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290 gc_cause, |
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291 heap->collector_policy()); |
0 | 292 |
293 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
294 | |
295 // Don't resize the young generation at an major collection. A | |
296 // desired young generation size may have been calculated but | |
297 // resizing the young generation complicates the code because the | |
298 // resizing of the old generation may have moved the boundary | |
299 // between the young generation and the old generation. Let the | |
300 // young generation resizing happen at the minor collections. | |
301 } | |
302 if (PrintAdaptiveSizePolicy) { | |
303 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
304 heap->total_collections()); | |
305 } | |
306 } | |
307 | |
308 if (UsePerfData) { | |
309 heap->gc_policy_counters()->update_counters(); | |
310 heap->gc_policy_counters()->update_old_capacity( | |
311 old_gen->capacity_in_bytes()); | |
312 heap->gc_policy_counters()->update_young_capacity( | |
313 young_gen->capacity_in_bytes()); | |
314 } | |
315 | |
316 heap->resize_all_tlabs(); | |
317 | |
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318 // We collected the heap, recalculate the metaspace capacity |
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319 MetaspaceGC::compute_new_size(); |
0 | 320 |
321 if (TraceGen1Time) accumulated_time()->stop(); | |
322 | |
323 if (PrintGC) { | |
324 if (PrintGCDetails) { | |
325 // Don't print a GC timestamp here. This is after the GC so | |
326 // would be confusing. | |
327 young_gen->print_used_change(young_gen_prev_used); | |
328 old_gen->print_used_change(old_gen_prev_used); | |
329 } | |
330 heap->print_heap_change(prev_used); | |
331 if (PrintGCDetails) { | |
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332 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 333 } |
334 } | |
335 | |
336 // Track memory usage and detect low memory | |
337 MemoryService::track_memory_usage(); | |
338 heap->update_counters(); | |
339 } | |
340 | |
341 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
342 HandleMark hm; // Discard invalid handles created during verification | |
343 gclog_or_tty->print(" VerifyAfterGC:"); | |
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344 Universe::verify(); |
0 | 345 } |
346 | |
347 // Re-verify object start arrays | |
348 if (VerifyObjectStartArray && | |
349 VerifyAfterGC) { | |
350 old_gen->verify_object_start_array(); | |
351 } | |
352 | |
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353 if (ZapUnusedHeapArea) { |
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354 old_gen->object_space()->check_mangled_unused_area_complete(); |
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355 } |
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356 |
0 | 357 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
358 | |
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359 heap->print_heap_after_gc(); |
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360 |
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361 heap->post_full_gc_dump(); |
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362 |
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363 #ifdef TRACESPINNING |
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364 ParallelTaskTerminator::print_termination_counts(); |
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365 #endif |
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366 |
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367 return true; |
0 | 368 } |
369 | |
370 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
371 PSYoungGen* young_gen, | |
372 PSOldGen* old_gen) { | |
373 MutableSpace* const eden_space = young_gen->eden_space(); | |
374 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
375 assert(young_gen->virtual_space()->alignment() == | |
376 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
377 | |
378 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
379 return false; | |
380 } | |
381 | |
382 // Both generations must be completely committed. | |
383 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
384 return false; | |
385 } | |
386 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
387 return false; | |
388 } | |
389 | |
390 // Figure out how much to take from eden. Include the average amount promoted | |
391 // in the total; otherwise the next young gen GC will simply bail out to a | |
392 // full GC. | |
393 const size_t alignment = old_gen->virtual_space()->alignment(); | |
394 const size_t eden_used = eden_space->used_in_bytes(); | |
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395 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 396 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
397 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
398 | |
399 if (absorb_size >= eden_capacity) { | |
400 return false; // Must leave some space in eden. | |
401 } | |
402 | |
403 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
404 if (new_young_size < young_gen->min_gen_size()) { | |
405 return false; // Respect young gen minimum size. | |
406 } | |
407 | |
408 if (TraceAdaptiveGCBoundary && Verbose) { | |
409 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
410 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
411 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
412 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
413 absorb_size / K, | |
414 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
415 young_gen->from_space()->used_in_bytes() / K, | |
416 young_gen->to_space()->used_in_bytes() / K, | |
417 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
418 } | |
419 | |
420 // Fill the unused part of the old gen. | |
421 MutableSpace* const old_space = old_gen->object_space(); | |
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422 HeapWord* const unused_start = old_space->top(); |
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423 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 424 |
481
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425 if (unused_words > 0) { |
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426 if (unused_words < CollectedHeap::min_fill_size()) { |
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427 return false; // If the old gen cannot be filled, must give up. |
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428 } |
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429 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 430 } |
431 | |
432 // Take the live data from eden and set both top and end in the old gen to | |
433 // eden top. (Need to set end because reset_after_change() mangles the region | |
434 // from end to virtual_space->high() in debug builds). | |
435 HeapWord* const new_top = eden_space->top(); | |
436 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
437 absorb_size); | |
438 young_gen->reset_after_change(); | |
439 old_space->set_top(new_top); | |
440 old_space->set_end(new_top); | |
441 old_gen->reset_after_change(); | |
442 | |
443 // Update the object start array for the filler object and the data from eden. | |
444 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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445 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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446 start_array->allocate_block(p); |
0 | 447 } |
448 | |
449 // Could update the promoted average here, but it is not typically updated at | |
450 // full GCs and the value to use is unclear. Something like | |
451 // | |
452 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
453 | |
454 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
455 return true; | |
456 } | |
457 | |
458 void PSMarkSweep::allocate_stacks() { | |
459 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
460 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
461 | |
462 PSYoungGen* young_gen = heap->young_gen(); | |
463 | |
464 MutableSpace* to_space = young_gen->to_space(); | |
465 _preserved_marks = (PreservedMark*)to_space->top(); | |
466 _preserved_count = 0; | |
467 | |
468 // We want to calculate the size in bytes first. | |
469 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
470 // Now divide by the size of a PreservedMark | |
471 _preserved_count_max /= sizeof(PreservedMark); | |
472 } | |
473 | |
474 | |
475 void PSMarkSweep::deallocate_stacks() { | |
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476 _preserved_mark_stack.clear(true); |
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477 _preserved_oop_stack.clear(true); |
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478 _marking_stack.clear(); |
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479 _objarray_stack.clear(true); |
0 | 480 } |
481 | |
482 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
483 // Recursively traverse all live objects and mark them | |
484 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
485 trace(" 1"); | |
486 | |
487 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
488 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
489 | |
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490 // Need to clear claim bits before the tracing starts. |
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491 ClassLoaderDataGraph::clear_claimed_marks(); |
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492 |
0 | 493 // General strong roots. |
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494 { |
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495 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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496 Universe::oops_do(mark_and_push_closure()); |
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497 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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498 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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499 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
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500 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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501 FlatProfiler::oops_do(mark_and_push_closure()); |
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502 Management::oops_do(mark_and_push_closure()); |
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503 JvmtiExport::oops_do(mark_and_push_closure()); |
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504 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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505 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
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506 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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507 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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508 } |
0 | 509 |
510 // Flush marking stack. | |
511 follow_stack(); | |
512 | |
513 // Process reference objects found during marking | |
514 { | |
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515 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 516 ref_processor()->process_discovered_references( |
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517 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
0 | 518 } |
519 | |
520 // Follow system dictionary roots and unload classes | |
521 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
522 | |
523 // Follow code cache roots | |
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524 CodeCache::do_unloading(is_alive_closure(), purged_class); |
0 | 525 follow_stack(); // Flush marking stack |
526 | |
527 // Update subklass/sibling/implementor links of live klasses | |
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528 Klass::clean_weak_klass_links(&is_alive); |
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529 assert(_marking_stack.is_empty(), "just drained"); |
941 | 530 |
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531 // Visit interned string tables and delete unmarked oops |
0 | 532 StringTable::unlink(is_alive_closure()); |
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533 // Clean up unreferenced symbols in symbol table. |
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534 SymbolTable::unlink(); |
0 | 535 |
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536 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
0 | 537 } |
538 | |
539 | |
540 void PSMarkSweep::mark_sweep_phase2() { | |
541 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
542 trace("2"); | |
543 | |
544 // Now all live objects are marked, compute the new object addresses. | |
545 | |
546 // It is not required that we traverse spaces in the same order in | |
547 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
548 // tracking expects us to do so. See comment under phase4. | |
549 | |
550 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
551 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
552 | |
553 PSOldGen* old_gen = heap->old_gen(); | |
554 | |
555 // Begin compacting into the old gen | |
556 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
557 | |
558 // This will also compact the young gen spaces. | |
559 old_gen->precompact(); | |
560 } | |
561 | |
562 // This should be moved to the shared markSweep code! | |
563 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
564 public: | |
565 void do_object(oop p) { ShouldNotReachHere(); } | |
566 bool do_object_b(oop p) { return true; } | |
567 }; | |
568 static PSAlwaysTrueClosure always_true; | |
569 | |
570 void PSMarkSweep::mark_sweep_phase3() { | |
571 // Adjust the pointers to reflect the new locations | |
572 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
573 trace("3"); | |
574 | |
575 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
576 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
577 | |
578 PSYoungGen* young_gen = heap->young_gen(); | |
579 PSOldGen* old_gen = heap->old_gen(); | |
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580 |
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581 // Need to clear claim bits before the tracing starts. |
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582 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 583 |
584 // General strong roots. | |
585 Universe::oops_do(adjust_root_pointer_closure()); | |
586 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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587 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 588 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
589 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
590 Management::oops_do(adjust_root_pointer_closure()); | |
591 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
592 // SO_AllClasses | |
593 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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594 ClassLoaderDataGraph::oops_do(adjust_root_pointer_closure(), adjust_klass_closure(), true); |
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595 //CodeCache::scavenge_root_nmethods_oops_do(adjust_root_pointer_closure()); |
0 | 596 |
597 // Now adjust pointers in remaining weak roots. (All of which should | |
598 // have been cleared if they pointed to non-surviving objects.) | |
599 // Global (weak) JNI handles | |
600 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
601 | |
602 CodeCache::oops_do(adjust_pointer_closure()); | |
603 StringTable::oops_do(adjust_root_pointer_closure()); | |
604 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
605 PSScavenge::reference_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
606 | |
607 adjust_marks(); | |
608 | |
609 young_gen->adjust_pointers(); | |
610 old_gen->adjust_pointers(); | |
611 } | |
612 | |
613 void PSMarkSweep::mark_sweep_phase4() { | |
614 EventMark m("4 compact heap"); | |
615 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
616 trace("4"); | |
617 | |
618 // All pointers are now adjusted, move objects accordingly | |
619 | |
620 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
621 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
622 | |
623 PSYoungGen* young_gen = heap->young_gen(); | |
624 PSOldGen* old_gen = heap->old_gen(); | |
625 | |
626 old_gen->compact(); | |
627 young_gen->compact(); | |
628 } | |
629 | |
630 jlong PSMarkSweep::millis_since_last_gc() { | |
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631 // We need a monotonically non-deccreasing time in ms but |
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632 // os::javaTimeMillis() does not guarantee monotonicity. |
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633 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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634 jlong ret_val = now - _time_of_last_gc; |
0 | 635 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
636 if (ret_val < 0) { | |
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637 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 638 return 0; |
639 } | |
640 return ret_val; | |
641 } | |
642 | |
643 void PSMarkSweep::reset_millis_since_last_gc() { | |
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644 // We need a monotonically non-deccreasing time in ms but |
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7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
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diff
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645 // os::javaTimeMillis() does not guarantee monotonicity. |
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646 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 647 } |