Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 6064:9d679effd28c
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Reviewed-by: mgerdin, johnc
author | brutisso |
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date | Tue, 15 May 2012 10:25:06 +0200 |
parents | ab4422d0ed59 |
children | da91efe96a93 |
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/psPermGen.hpp" | |
36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
37 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
38 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
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 unsigned int PSMarkSweep::_total_invocations = 0; | |
56 jlong PSMarkSweep::_time_of_last_gc = 0; | |
57 CollectorCounters* PSMarkSweep::_counters = NULL; | |
58 | |
59 void PSMarkSweep::initialize() { | |
60 MemRegion mr = Universe::heap()->reserved_region(); | |
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61 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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62 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 63 } |
64 | |
65 // This method contains all heap specific policy for invoking mark sweep. | |
66 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
67 // the heap. It will do nothing further. If we need to bail out for policy | |
68 // reasons, scavenge before full gc, or any other specialized behavior, it | |
69 // needs to be added here. | |
70 // | |
71 // Note that this method should only be called from the vm_thread while | |
72 // at a safepoint! | |
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73 // |
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74 // Note that the all_soft_refs_clear flag in the collector policy |
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75 // may be true because this method can be called without intervening |
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76 // activity. For example when the heap space is tight and full measure |
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77 // are being taken to free space. |
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78 |
0 | 79 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
80 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
81 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
82 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
83 | |
84 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
85 GCCause::Cause gc_cause = heap->gc_cause(); | |
86 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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87 IsGCActiveMark mark; |
0 | 88 |
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89 if (ScavengeBeforeFullGC) { |
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90 PSScavenge::invoke_no_policy(); |
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91 } |
0 | 92 |
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93 const bool clear_all_soft_refs = |
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94 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 95 |
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96 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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97 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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98 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 99 } |
100 | |
101 // This method contains no policy. You should probably | |
102 // be calling invoke() instead. | |
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103 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 104 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
105 assert(ref_processor() != NULL, "Sanity"); | |
106 | |
107 if (GC_locker::check_active_before_gc()) { | |
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108 return false; |
0 | 109 } |
110 | |
111 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
112 GCCause::Cause gc_cause = heap->gc_cause(); | |
113 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
114 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
115 | |
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116 // The scope of casr should end after code that can change |
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117 // CollectorPolicy::_should_clear_all_soft_refs. |
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118 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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119 |
0 | 120 PSYoungGen* young_gen = heap->young_gen(); |
121 PSOldGen* old_gen = heap->old_gen(); | |
122 PSPermGen* perm_gen = heap->perm_gen(); | |
123 | |
124 // Increment the invocation count | |
125 heap->increment_total_collections(true /* full */); | |
126 | |
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127 // Save information needed to minimize mangling |
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128 heap->record_gen_tops_before_GC(); |
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129 |
0 | 130 // We need to track unique mark sweep invocations as well. |
131 _total_invocations++; | |
132 | |
133 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
134 | |
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135 heap->print_heap_before_gc(); |
0 | 136 |
137 // Fill in TLABs | |
138 heap->accumulate_statistics_all_tlabs(); | |
139 heap->ensure_parsability(true); // retire TLABs | |
140 | |
141 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
142 HandleMark hm; // Discard invalid handles created during verification | |
143 gclog_or_tty->print(" VerifyBeforeGC:"); | |
144 Universe::verify(true); | |
145 } | |
146 | |
147 // Verify object start arrays | |
148 if (VerifyObjectStartArray && | |
149 VerifyBeforeGC) { | |
150 old_gen->verify_object_start_array(); | |
151 perm_gen->verify_object_start_array(); | |
152 } | |
153 | |
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154 heap->pre_full_gc_dump(); |
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155 |
0 | 156 // Filled in below to track the state of the young gen after the collection. |
157 bool eden_empty; | |
158 bool survivors_empty; | |
159 bool young_gen_empty; | |
160 | |
161 { | |
162 HandleMark hm; | |
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163 |
0 | 164 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
165 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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166 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 167 TraceCollectorStats tcs(counters()); |
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168 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 169 |
170 if (TraceGen1Time) accumulated_time()->start(); | |
171 | |
172 // Let the size policy know we're starting | |
173 size_policy->major_collection_begin(); | |
174 | |
175 // When collecting the permanent generation methodOops may be moving, | |
176 // so we either have to flush all bcp data or convert it into bci. | |
177 CodeCache::gc_prologue(); | |
178 Threads::gc_prologue(); | |
179 BiasedLocking::preserve_marks(); | |
180 | |
181 // Capture heap size before collection for printing. | |
182 size_t prev_used = heap->used(); | |
183 | |
184 // Capture perm gen size before collection for sizing. | |
185 size_t perm_gen_prev_used = perm_gen->used_in_bytes(); | |
186 | |
187 // For PrintGCDetails | |
188 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
189 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
190 | |
191 allocate_stacks(); | |
192 | |
193 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
194 | |
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195 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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196 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 197 |
198 mark_sweep_phase1(clear_all_softrefs); | |
199 | |
200 mark_sweep_phase2(); | |
201 | |
202 // Don't add any more derived pointers during phase3 | |
203 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
204 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
205 | |
206 mark_sweep_phase3(); | |
207 | |
208 mark_sweep_phase4(); | |
209 | |
210 restore_marks(); | |
211 | |
212 deallocate_stacks(); | |
213 | |
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214 if (ZapUnusedHeapArea) { |
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215 // Do a complete mangle (top to end) because the usage for |
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216 // scratch does not maintain a top pointer. |
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217 young_gen->to_space()->mangle_unused_area_complete(); |
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218 } |
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219 |
0 | 220 eden_empty = young_gen->eden_space()->is_empty(); |
221 if (!eden_empty) { | |
222 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
223 } | |
224 | |
225 // Update heap occupancy information which is used as | |
226 // input to soft ref clearing policy at the next gc. | |
227 Universe::update_heap_info_at_gc(); | |
228 | |
229 survivors_empty = young_gen->from_space()->is_empty() && | |
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230 young_gen->to_space()->is_empty(); |
0 | 231 young_gen_empty = eden_empty && survivors_empty; |
232 | |
233 BarrierSet* bs = heap->barrier_set(); | |
234 if (bs->is_a(BarrierSet::ModRef)) { | |
235 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
236 MemRegion old_mr = heap->old_gen()->reserved(); | |
237 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
238 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
239 | |
240 if (young_gen_empty) { | |
241 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
242 } else { | |
243 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
244 } | |
245 } | |
246 | |
247 BiasedLocking::restore_marks(); | |
248 Threads::gc_epilogue(); | |
249 CodeCache::gc_epilogue(); | |
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250 JvmtiExport::gc_epilogue(); |
0 | 251 |
252 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
253 | |
254 ref_processor()->enqueue_discovered_references(NULL); | |
255 | |
256 // Update time of last GC | |
257 reset_millis_since_last_gc(); | |
258 | |
259 // Let the size policy know we're done | |
260 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
261 | |
262 if (UseAdaptiveSizePolicy) { | |
263 | |
264 if (PrintAdaptiveSizePolicy) { | |
265 gclog_or_tty->print("AdaptiveSizeStart: "); | |
266 gclog_or_tty->stamp(); | |
267 gclog_or_tty->print_cr(" collection: %d ", | |
268 heap->total_collections()); | |
269 if (Verbose) { | |
270 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
271 " perm_gen_capacity: %d ", | |
272 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
273 perm_gen->capacity_in_bytes()); | |
274 } | |
275 } | |
276 | |
277 // Don't check if the size_policy is ready here. Let | |
278 // the size_policy check that internally. | |
279 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
280 ((gc_cause != GCCause::_java_lang_system_gc) || | |
281 UseAdaptiveSizePolicyWithSystemGC)) { | |
282 // Calculate optimal free space amounts | |
283 assert(young_gen->max_size() > | |
284 young_gen->from_space()->capacity_in_bytes() + | |
285 young_gen->to_space()->capacity_in_bytes(), | |
286 "Sizes of space in young gen are out-of-bounds"); | |
287 size_t max_eden_size = young_gen->max_size() - | |
288 young_gen->from_space()->capacity_in_bytes() - | |
289 young_gen->to_space()->capacity_in_bytes(); | |
290 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
291 young_gen->eden_space()->used_in_bytes(), | |
292 old_gen->used_in_bytes(), | |
293 perm_gen->used_in_bytes(), | |
294 young_gen->eden_space()->capacity_in_bytes(), | |
295 old_gen->max_gen_size(), | |
296 max_eden_size, | |
297 true /* full gc*/, | |
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298 gc_cause, |
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299 heap->collector_policy()); |
0 | 300 |
301 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
302 | |
303 // Don't resize the young generation at an major collection. A | |
304 // desired young generation size may have been calculated but | |
305 // resizing the young generation complicates the code because the | |
306 // resizing of the old generation may have moved the boundary | |
307 // between the young generation and the old generation. Let the | |
308 // young generation resizing happen at the minor collections. | |
309 } | |
310 if (PrintAdaptiveSizePolicy) { | |
311 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
312 heap->total_collections()); | |
313 } | |
314 } | |
315 | |
316 if (UsePerfData) { | |
317 heap->gc_policy_counters()->update_counters(); | |
318 heap->gc_policy_counters()->update_old_capacity( | |
319 old_gen->capacity_in_bytes()); | |
320 heap->gc_policy_counters()->update_young_capacity( | |
321 young_gen->capacity_in_bytes()); | |
322 } | |
323 | |
324 heap->resize_all_tlabs(); | |
325 | |
326 // We collected the perm gen, so we'll resize it here. | |
327 perm_gen->compute_new_size(perm_gen_prev_used); | |
328 | |
329 if (TraceGen1Time) accumulated_time()->stop(); | |
330 | |
331 if (PrintGC) { | |
332 if (PrintGCDetails) { | |
333 // Don't print a GC timestamp here. This is after the GC so | |
334 // would be confusing. | |
335 young_gen->print_used_change(young_gen_prev_used); | |
336 old_gen->print_used_change(old_gen_prev_used); | |
337 } | |
338 heap->print_heap_change(prev_used); | |
339 // Do perm gen after heap becase prev_used does | |
340 // not include the perm gen (done this way in the other | |
341 // collectors). | |
342 if (PrintGCDetails) { | |
343 perm_gen->print_used_change(perm_gen_prev_used); | |
344 } | |
345 } | |
346 | |
347 // Track memory usage and detect low memory | |
348 MemoryService::track_memory_usage(); | |
349 heap->update_counters(); | |
350 } | |
351 | |
352 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
353 HandleMark hm; // Discard invalid handles created during verification | |
354 gclog_or_tty->print(" VerifyAfterGC:"); | |
355 Universe::verify(false); | |
356 } | |
357 | |
358 // Re-verify object start arrays | |
359 if (VerifyObjectStartArray && | |
360 VerifyAfterGC) { | |
361 old_gen->verify_object_start_array(); | |
362 perm_gen->verify_object_start_array(); | |
363 } | |
364 | |
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365 if (ZapUnusedHeapArea) { |
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366 old_gen->object_space()->check_mangled_unused_area_complete(); |
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367 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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368 } |
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369 |
0 | 370 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
371 | |
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372 heap->print_heap_after_gc(); |
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373 |
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374 heap->post_full_gc_dump(); |
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375 |
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376 #ifdef TRACESPINNING |
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377 ParallelTaskTerminator::print_termination_counts(); |
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378 #endif |
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379 |
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380 return true; |
0 | 381 } |
382 | |
383 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
384 PSYoungGen* young_gen, | |
385 PSOldGen* old_gen) { | |
386 MutableSpace* const eden_space = young_gen->eden_space(); | |
387 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
388 assert(young_gen->virtual_space()->alignment() == | |
389 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
390 | |
391 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
392 return false; | |
393 } | |
394 | |
395 // Both generations must be completely committed. | |
396 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
397 return false; | |
398 } | |
399 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
400 return false; | |
401 } | |
402 | |
403 // Figure out how much to take from eden. Include the average amount promoted | |
404 // in the total; otherwise the next young gen GC will simply bail out to a | |
405 // full GC. | |
406 const size_t alignment = old_gen->virtual_space()->alignment(); | |
407 const size_t eden_used = eden_space->used_in_bytes(); | |
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408 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 409 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
410 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
411 | |
412 if (absorb_size >= eden_capacity) { | |
413 return false; // Must leave some space in eden. | |
414 } | |
415 | |
416 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
417 if (new_young_size < young_gen->min_gen_size()) { | |
418 return false; // Respect young gen minimum size. | |
419 } | |
420 | |
421 if (TraceAdaptiveGCBoundary && Verbose) { | |
422 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
423 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
424 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
425 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
426 absorb_size / K, | |
427 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
428 young_gen->from_space()->used_in_bytes() / K, | |
429 young_gen->to_space()->used_in_bytes() / K, | |
430 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
431 } | |
432 | |
433 // Fill the unused part of the old gen. | |
434 MutableSpace* const old_space = old_gen->object_space(); | |
481
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435 HeapWord* const unused_start = old_space->top(); |
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436 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 437 |
481
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438 if (unused_words > 0) { |
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439 if (unused_words < CollectedHeap::min_fill_size()) { |
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440 return false; // If the old gen cannot be filled, must give up. |
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441 } |
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442 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 443 } |
444 | |
445 // Take the live data from eden and set both top and end in the old gen to | |
446 // eden top. (Need to set end because reset_after_change() mangles the region | |
447 // from end to virtual_space->high() in debug builds). | |
448 HeapWord* const new_top = eden_space->top(); | |
449 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
450 absorb_size); | |
451 young_gen->reset_after_change(); | |
452 old_space->set_top(new_top); | |
453 old_space->set_end(new_top); | |
454 old_gen->reset_after_change(); | |
455 | |
456 // Update the object start array for the filler object and the data from eden. | |
457 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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458 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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459 start_array->allocate_block(p); |
0 | 460 } |
461 | |
462 // Could update the promoted average here, but it is not typically updated at | |
463 // full GCs and the value to use is unclear. Something like | |
464 // | |
465 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
466 | |
467 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
468 return true; | |
469 } | |
470 | |
471 void PSMarkSweep::allocate_stacks() { | |
472 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
473 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
474 | |
475 PSYoungGen* young_gen = heap->young_gen(); | |
476 | |
477 MutableSpace* to_space = young_gen->to_space(); | |
478 _preserved_marks = (PreservedMark*)to_space->top(); | |
479 _preserved_count = 0; | |
480 | |
481 // We want to calculate the size in bytes first. | |
482 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
483 // Now divide by the size of a PreservedMark | |
484 _preserved_count_max /= sizeof(PreservedMark); | |
485 } | |
486 | |
487 | |
488 void PSMarkSweep::deallocate_stacks() { | |
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489 _preserved_mark_stack.clear(true); |
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490 _preserved_oop_stack.clear(true); |
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491 _marking_stack.clear(); |
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492 _objarray_stack.clear(true); |
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493 _revisit_klass_stack.clear(true); |
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494 _revisit_mdo_stack.clear(true); |
0 | 495 } |
496 | |
497 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
498 // Recursively traverse all live objects and mark them | |
499 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
500 trace(" 1"); | |
501 | |
502 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
503 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
504 | |
505 // General strong roots. | |
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506 { |
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507 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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508 Universe::oops_do(mark_and_push_closure()); |
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509 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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510 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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511 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
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512 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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513 FlatProfiler::oops_do(mark_and_push_closure()); |
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514 Management::oops_do(mark_and_push_closure()); |
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515 JvmtiExport::oops_do(mark_and_push_closure()); |
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516 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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517 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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518 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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519 } |
0 | 520 |
521 // Flush marking stack. | |
522 follow_stack(); | |
523 | |
524 // Process reference objects found during marking | |
525 { | |
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526 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 527 ref_processor()->process_discovered_references( |
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528 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
0 | 529 } |
530 | |
531 // Follow system dictionary roots and unload classes | |
532 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
533 | |
534 // Follow code cache roots | |
535 CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(), | |
536 purged_class); | |
537 follow_stack(); // Flush marking stack | |
538 | |
539 // Update subklass/sibling/implementor links of live klasses | |
540 follow_weak_klass_links(); | |
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541 assert(_marking_stack.is_empty(), "just drained"); |
0 | 542 |
941 | 543 // Visit memoized mdo's and clear unmarked weak refs |
544 follow_mdo_weak_refs(); | |
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545 assert(_marking_stack.is_empty(), "just drained"); |
941 | 546 |
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547 // Visit interned string tables and delete unmarked oops |
0 | 548 StringTable::unlink(is_alive_closure()); |
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549 // Clean up unreferenced symbols in symbol table. |
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550 SymbolTable::unlink(); |
0 | 551 |
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552 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
0 | 553 } |
554 | |
555 | |
556 void PSMarkSweep::mark_sweep_phase2() { | |
557 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
558 trace("2"); | |
559 | |
560 // Now all live objects are marked, compute the new object addresses. | |
561 | |
562 // It is imperative that we traverse perm_gen LAST. If dead space is | |
563 // allowed a range of dead object may get overwritten by a dead int | |
564 // array. If perm_gen is not traversed last a klassOop may get | |
565 // overwritten. This is fine since it is dead, but if the class has dead | |
566 // instances we have to skip them, and in order to find their size we | |
567 // need the klassOop! | |
568 // | |
569 // It is not required that we traverse spaces in the same order in | |
570 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
571 // tracking expects us to do so. See comment under phase4. | |
572 | |
573 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
574 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
575 | |
576 PSOldGen* old_gen = heap->old_gen(); | |
577 PSPermGen* perm_gen = heap->perm_gen(); | |
578 | |
579 // Begin compacting into the old gen | |
580 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
581 | |
582 // This will also compact the young gen spaces. | |
583 old_gen->precompact(); | |
584 | |
585 // Compact the perm gen into the perm gen | |
586 PSMarkSweepDecorator::set_destination_decorator_perm_gen(); | |
587 | |
588 perm_gen->precompact(); | |
589 } | |
590 | |
591 // This should be moved to the shared markSweep code! | |
592 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
593 public: | |
594 void do_object(oop p) { ShouldNotReachHere(); } | |
595 bool do_object_b(oop p) { return true; } | |
596 }; | |
597 static PSAlwaysTrueClosure always_true; | |
598 | |
599 void PSMarkSweep::mark_sweep_phase3() { | |
600 // Adjust the pointers to reflect the new locations | |
601 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
602 trace("3"); | |
603 | |
604 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
605 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
606 | |
607 PSYoungGen* young_gen = heap->young_gen(); | |
608 PSOldGen* old_gen = heap->old_gen(); | |
609 PSPermGen* perm_gen = heap->perm_gen(); | |
610 | |
611 // General strong roots. | |
612 Universe::oops_do(adjust_root_pointer_closure()); | |
613 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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614 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 615 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
616 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
617 Management::oops_do(adjust_root_pointer_closure()); | |
618 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
619 // SO_AllClasses | |
620 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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621 //CodeCache::scavenge_root_nmethods_oops_do(adjust_root_pointer_closure()); |
0 | 622 |
623 // Now adjust pointers in remaining weak roots. (All of which should | |
624 // have been cleared if they pointed to non-surviving objects.) | |
625 // Global (weak) JNI handles | |
626 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
627 | |
628 CodeCache::oops_do(adjust_pointer_closure()); | |
629 StringTable::oops_do(adjust_root_pointer_closure()); | |
630 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
631 PSScavenge::reference_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
632 | |
633 adjust_marks(); | |
634 | |
635 young_gen->adjust_pointers(); | |
636 old_gen->adjust_pointers(); | |
637 perm_gen->adjust_pointers(); | |
638 } | |
639 | |
640 void PSMarkSweep::mark_sweep_phase4() { | |
641 EventMark m("4 compact heap"); | |
642 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
643 trace("4"); | |
644 | |
645 // All pointers are now adjusted, move objects accordingly | |
646 | |
647 // It is imperative that we traverse perm_gen first in phase4. All | |
648 // classes must be allocated earlier than their instances, and traversing | |
649 // perm_gen first makes sure that all klassOops have moved to their new | |
650 // location before any instance does a dispatch through it's klass! | |
651 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
652 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
653 | |
654 PSYoungGen* young_gen = heap->young_gen(); | |
655 PSOldGen* old_gen = heap->old_gen(); | |
656 PSPermGen* perm_gen = heap->perm_gen(); | |
657 | |
658 perm_gen->compact(); | |
659 old_gen->compact(); | |
660 young_gen->compact(); | |
661 } | |
662 | |
663 jlong PSMarkSweep::millis_since_last_gc() { | |
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664 // We need a monotonically non-deccreasing time in ms but |
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665 // os::javaTimeMillis() does not guarantee monotonicity. |
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666 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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667 jlong ret_val = now - _time_of_last_gc; |
0 | 668 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
669 if (ret_val < 0) { | |
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670 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 671 return 0; |
672 } | |
673 return ret_val; | |
674 } | |
675 | |
676 void PSMarkSweep::reset_millis_since_last_gc() { | |
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677 // 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
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678 // os::javaTimeMillis() does not guarantee monotonicity. |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
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679 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 680 } |