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annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 13422:55dd6e77b399
8028624: [TESTBUG] compiler/intrinsics/mathexact/DecExactLTest executes DecExactITest
Reviewed-by: kvn, twisti
author | rbackman |
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date | Fri, 22 Nov 2013 15:26:37 +0100 |
parents | 86e6d691f2e1 |
children | 63a4eb8bcd23 270d7cb38f40 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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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/parallelScavengeHeap.hpp" | |
30 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
31 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
32 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
33 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
34 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
35 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
10405 | 36 #include "gc_implementation/shared/gcHeapSummary.hpp" |
37 #include "gc_implementation/shared/gcTimer.hpp" | |
38 #include "gc_implementation/shared/gcTrace.hpp" | |
39 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 40 #include "gc_implementation/shared/isGCActiveMark.hpp" |
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41 #include "gc_implementation/shared/markSweep.hpp" |
1972 | 42 #include "gc_implementation/shared/spaceDecorator.hpp" |
43 #include "gc_interface/gcCause.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/referenceProcessor.hpp" | |
47 #include "oops/oop.inline.hpp" | |
48 #include "runtime/biasedLocking.hpp" | |
49 #include "runtime/fprofiler.hpp" | |
50 #include "runtime/safepoint.hpp" | |
51 #include "runtime/vmThread.hpp" | |
52 #include "services/management.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/events.hpp" | |
55 #include "utilities/stack.inline.hpp" | |
0 | 56 |
57 elapsedTimer PSMarkSweep::_accumulated_time; | |
58 jlong PSMarkSweep::_time_of_last_gc = 0; | |
59 CollectorCounters* PSMarkSweep::_counters = NULL; | |
60 | |
61 void PSMarkSweep::initialize() { | |
62 MemRegion mr = Universe::heap()->reserved_region(); | |
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63 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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64 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 65 } |
66 | |
67 // This method contains all heap specific policy for invoking mark sweep. | |
68 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
69 // the heap. It will do nothing further. If we need to bail out for policy | |
70 // reasons, scavenge before full gc, or any other specialized behavior, it | |
71 // needs to be added here. | |
72 // | |
73 // Note that this method should only be called from the vm_thread while | |
74 // at a safepoint! | |
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75 // |
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76 // Note that the all_soft_refs_clear flag in the collector policy |
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77 // may be true because this method can be called without intervening |
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78 // activity. For example when the heap space is tight and full measure |
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79 // are being taken to free space. |
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80 |
0 | 81 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
82 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
83 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
84 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
85 | |
86 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
87 GCCause::Cause gc_cause = heap->gc_cause(); | |
88 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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89 IsGCActiveMark mark; |
0 | 90 |
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91 if (ScavengeBeforeFullGC) { |
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92 PSScavenge::invoke_no_policy(); |
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93 } |
0 | 94 |
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95 const bool clear_all_soft_refs = |
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96 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 97 |
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98 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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99 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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100 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 101 } |
102 | |
103 // This method contains no policy. You should probably | |
104 // be calling invoke() instead. | |
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105 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 106 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
107 assert(ref_processor() != NULL, "Sanity"); | |
108 | |
109 if (GC_locker::check_active_before_gc()) { | |
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110 return false; |
0 | 111 } |
112 | |
113 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
10405 | 114 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
0 | 115 GCCause::Cause gc_cause = heap->gc_cause(); |
10405 | 116 |
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117 _gc_timer->register_gc_start(); |
10405 | 118 _gc_tracer->report_gc_start(gc_cause, _gc_timer->gc_start()); |
119 | |
0 | 120 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); |
121 | |
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122 // The scope of casr should end after code that can change |
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123 // CollectorPolicy::_should_clear_all_soft_refs. |
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124 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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125 |
0 | 126 PSYoungGen* young_gen = heap->young_gen(); |
127 PSOldGen* old_gen = heap->old_gen(); | |
128 | |
129 // Increment the invocation count | |
130 heap->increment_total_collections(true /* full */); | |
131 | |
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132 // Save information needed to minimize mangling |
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133 heap->record_gen_tops_before_GC(); |
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134 |
0 | 135 // We need to track unique mark sweep invocations as well. |
136 _total_invocations++; | |
137 | |
138 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
139 | |
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140 heap->print_heap_before_gc(); |
10405 | 141 heap->trace_heap_before_gc(_gc_tracer); |
0 | 142 |
143 // Fill in TLABs | |
144 heap->accumulate_statistics_all_tlabs(); | |
145 heap->ensure_parsability(true); // retire TLABs | |
146 | |
147 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
148 HandleMark hm; // Discard invalid handles created during verification | |
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149 Universe::verify(" VerifyBeforeGC:"); |
0 | 150 } |
151 | |
152 // Verify object start arrays | |
153 if (VerifyObjectStartArray && | |
154 VerifyBeforeGC) { | |
155 old_gen->verify_object_start_array(); | |
156 } | |
157 | |
10405 | 158 heap->pre_full_gc_dump(_gc_timer); |
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159 |
0 | 160 // Filled in below to track the state of the young gen after the collection. |
161 bool eden_empty; | |
162 bool survivors_empty; | |
163 bool young_gen_empty; | |
164 | |
165 { | |
166 HandleMark hm; | |
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167 |
0 | 168 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
169 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
10405 | 170 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
0 | 171 TraceCollectorStats tcs(counters()); |
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172 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 173 |
174 if (TraceGen1Time) accumulated_time()->start(); | |
175 | |
176 // Let the size policy know we're starting | |
177 size_policy->major_collection_begin(); | |
178 | |
179 CodeCache::gc_prologue(); | |
180 Threads::gc_prologue(); | |
181 BiasedLocking::preserve_marks(); | |
182 | |
183 // Capture heap size before collection for printing. | |
184 size_t prev_used = heap->used(); | |
185 | |
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186 // Capture metadata size before collection for sizing. |
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187 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
0 | 188 |
189 // For PrintGCDetails | |
190 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
191 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
192 | |
193 allocate_stacks(); | |
194 | |
195 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
196 | |
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197 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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198 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 199 |
200 mark_sweep_phase1(clear_all_softrefs); | |
201 | |
202 mark_sweep_phase2(); | |
203 | |
204 // Don't add any more derived pointers during phase3 | |
205 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
206 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
207 | |
208 mark_sweep_phase3(); | |
209 | |
210 mark_sweep_phase4(); | |
211 | |
212 restore_marks(); | |
213 | |
214 deallocate_stacks(); | |
215 | |
263
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216 if (ZapUnusedHeapArea) { |
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217 // Do a complete mangle (top to end) because the usage for |
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218 // scratch does not maintain a top pointer. |
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219 young_gen->to_space()->mangle_unused_area_complete(); |
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220 } |
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221 |
0 | 222 eden_empty = young_gen->eden_space()->is_empty(); |
223 if (!eden_empty) { | |
224 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
225 } | |
226 | |
227 // Update heap occupancy information which is used as | |
228 // input to soft ref clearing policy at the next gc. | |
229 Universe::update_heap_info_at_gc(); | |
230 | |
231 survivors_empty = young_gen->from_space()->is_empty() && | |
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232 young_gen->to_space()->is_empty(); |
0 | 233 young_gen_empty = eden_empty && survivors_empty; |
234 | |
235 BarrierSet* bs = heap->barrier_set(); | |
236 if (bs->is_a(BarrierSet::ModRef)) { | |
237 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
238 MemRegion old_mr = heap->old_gen()->reserved(); | |
239 if (young_gen_empty) { | |
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240 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 241 } else { |
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242 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 243 } |
244 } | |
245 | |
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246 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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247 ClassLoaderDataGraph::purge(); |
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248 MetaspaceAux::verify_metrics(); |
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249 |
0 | 250 BiasedLocking::restore_marks(); |
251 Threads::gc_epilogue(); | |
252 CodeCache::gc_epilogue(); | |
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253 JvmtiExport::gc_epilogue(); |
0 | 254 |
255 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
256 | |
257 ref_processor()->enqueue_discovered_references(NULL); | |
258 | |
259 // Update time of last GC | |
260 reset_millis_since_last_gc(); | |
261 | |
262 // Let the size policy know we're done | |
263 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
264 | |
265 if (UseAdaptiveSizePolicy) { | |
266 | |
267 if (PrintAdaptiveSizePolicy) { | |
268 gclog_or_tty->print("AdaptiveSizeStart: "); | |
269 gclog_or_tty->stamp(); | |
270 gclog_or_tty->print_cr(" collection: %d ", | |
271 heap->total_collections()); | |
272 if (Verbose) { | |
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273 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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274 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 275 } |
276 } | |
277 | |
278 // Don't check if the size_policy is ready here. Let | |
279 // the size_policy check that internally. | |
280 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
281 ((gc_cause != GCCause::_java_lang_system_gc) || | |
282 UseAdaptiveSizePolicyWithSystemGC)) { | |
283 // Calculate optimal free space amounts | |
284 assert(young_gen->max_size() > | |
285 young_gen->from_space()->capacity_in_bytes() + | |
286 young_gen->to_space()->capacity_in_bytes(), | |
287 "Sizes of space in young gen are out-of-bounds"); | |
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288 |
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289 size_t young_live = young_gen->used_in_bytes(); |
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290 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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291 size_t old_live = old_gen->used_in_bytes(); |
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292 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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293 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 294 size_t max_eden_size = young_gen->max_size() - |
295 young_gen->from_space()->capacity_in_bytes() - | |
296 young_gen->to_space()->capacity_in_bytes(); | |
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297 |
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298 // Used for diagnostics |
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299 size_policy->clear_generation_free_space_flags(); |
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300 |
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301 size_policy->compute_generations_free_space(young_live, |
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302 eden_live, |
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303 old_live, |
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304 cur_eden, |
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305 max_old_gen_size, |
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306 max_eden_size, |
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307 true /* full gc*/); |
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308 |
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309 size_policy->check_gc_overhead_limit(young_live, |
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310 eden_live, |
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311 max_old_gen_size, |
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312 max_eden_size, |
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313 true /* full gc*/, |
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314 gc_cause, |
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315 heap->collector_policy()); |
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316 |
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317 size_policy->decay_supplemental_growth(true /* full gc*/); |
0 | 318 |
319 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
320 | |
321 // Don't resize the young generation at an major collection. A | |
322 // desired young generation size may have been calculated but | |
323 // resizing the young generation complicates the code because the | |
324 // resizing of the old generation may have moved the boundary | |
325 // between the young generation and the old generation. Let the | |
326 // young generation resizing happen at the minor collections. | |
327 } | |
328 if (PrintAdaptiveSizePolicy) { | |
329 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
330 heap->total_collections()); | |
331 } | |
332 } | |
333 | |
334 if (UsePerfData) { | |
335 heap->gc_policy_counters()->update_counters(); | |
336 heap->gc_policy_counters()->update_old_capacity( | |
337 old_gen->capacity_in_bytes()); | |
338 heap->gc_policy_counters()->update_young_capacity( | |
339 young_gen->capacity_in_bytes()); | |
340 } | |
341 | |
342 heap->resize_all_tlabs(); | |
343 | |
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344 // We collected the heap, recalculate the metaspace capacity |
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345 MetaspaceGC::compute_new_size(); |
0 | 346 |
347 if (TraceGen1Time) accumulated_time()->stop(); | |
348 | |
349 if (PrintGC) { | |
350 if (PrintGCDetails) { | |
351 // Don't print a GC timestamp here. This is after the GC so | |
352 // would be confusing. | |
353 young_gen->print_used_change(young_gen_prev_used); | |
354 old_gen->print_used_change(old_gen_prev_used); | |
355 } | |
356 heap->print_heap_change(prev_used); | |
357 if (PrintGCDetails) { | |
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358 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 359 } |
360 } | |
361 | |
362 // Track memory usage and detect low memory | |
363 MemoryService::track_memory_usage(); | |
364 heap->update_counters(); | |
365 } | |
366 | |
367 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
368 HandleMark hm; // Discard invalid handles created during verification | |
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369 Universe::verify(" VerifyAfterGC:"); |
0 | 370 } |
371 | |
372 // Re-verify object start arrays | |
373 if (VerifyObjectStartArray && | |
374 VerifyAfterGC) { | |
375 old_gen->verify_object_start_array(); | |
376 } | |
377 | |
263
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378 if (ZapUnusedHeapArea) { |
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379 old_gen->object_space()->check_mangled_unused_area_complete(); |
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380 } |
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381 |
0 | 382 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
383 | |
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384 heap->print_heap_after_gc(); |
10405 | 385 heap->trace_heap_after_gc(_gc_tracer); |
546
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386 |
10405 | 387 heap->post_full_gc_dump(_gc_timer); |
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388 |
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389 #ifdef TRACESPINNING |
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390 ParallelTaskTerminator::print_termination_counts(); |
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391 #endif |
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392 |
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393 _gc_timer->register_gc_end(); |
10405 | 394 |
395 _gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
396 | |
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397 return true; |
0 | 398 } |
399 | |
400 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
401 PSYoungGen* young_gen, | |
402 PSOldGen* old_gen) { | |
403 MutableSpace* const eden_space = young_gen->eden_space(); | |
404 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
405 assert(young_gen->virtual_space()->alignment() == | |
406 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
407 | |
408 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
409 return false; | |
410 } | |
411 | |
412 // Both generations must be completely committed. | |
413 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
414 return false; | |
415 } | |
416 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
417 return false; | |
418 } | |
419 | |
420 // Figure out how much to take from eden. Include the average amount promoted | |
421 // in the total; otherwise the next young gen GC will simply bail out to a | |
422 // full GC. | |
423 const size_t alignment = old_gen->virtual_space()->alignment(); | |
424 const size_t eden_used = eden_space->used_in_bytes(); | |
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425 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 426 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
427 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
428 | |
429 if (absorb_size >= eden_capacity) { | |
430 return false; // Must leave some space in eden. | |
431 } | |
432 | |
433 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
434 if (new_young_size < young_gen->min_gen_size()) { | |
435 return false; // Respect young gen minimum size. | |
436 } | |
437 | |
438 if (TraceAdaptiveGCBoundary && Verbose) { | |
439 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
440 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
441 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
442 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
443 absorb_size / K, | |
444 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
445 young_gen->from_space()->used_in_bytes() / K, | |
446 young_gen->to_space()->used_in_bytes() / K, | |
447 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
448 } | |
449 | |
450 // Fill the unused part of the old gen. | |
451 MutableSpace* const old_space = old_gen->object_space(); | |
481
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452 HeapWord* const unused_start = old_space->top(); |
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453 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 454 |
481
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455 if (unused_words > 0) { |
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456 if (unused_words < CollectedHeap::min_fill_size()) { |
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457 return false; // If the old gen cannot be filled, must give up. |
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458 } |
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459 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 460 } |
461 | |
462 // Take the live data from eden and set both top and end in the old gen to | |
463 // eden top. (Need to set end because reset_after_change() mangles the region | |
464 // from end to virtual_space->high() in debug builds). | |
465 HeapWord* const new_top = eden_space->top(); | |
466 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
467 absorb_size); | |
468 young_gen->reset_after_change(); | |
469 old_space->set_top(new_top); | |
470 old_space->set_end(new_top); | |
471 old_gen->reset_after_change(); | |
472 | |
473 // Update the object start array for the filler object and the data from eden. | |
474 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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475 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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476 start_array->allocate_block(p); |
0 | 477 } |
478 | |
479 // Could update the promoted average here, but it is not typically updated at | |
480 // full GCs and the value to use is unclear. Something like | |
481 // | |
482 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
483 | |
484 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
485 return true; | |
486 } | |
487 | |
488 void PSMarkSweep::allocate_stacks() { | |
489 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
490 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
491 | |
492 PSYoungGen* young_gen = heap->young_gen(); | |
493 | |
494 MutableSpace* to_space = young_gen->to_space(); | |
495 _preserved_marks = (PreservedMark*)to_space->top(); | |
496 _preserved_count = 0; | |
497 | |
498 // We want to calculate the size in bytes first. | |
499 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
500 // Now divide by the size of a PreservedMark | |
501 _preserved_count_max /= sizeof(PreservedMark); | |
502 } | |
503 | |
504 | |
505 void PSMarkSweep::deallocate_stacks() { | |
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506 _preserved_mark_stack.clear(true); |
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507 _preserved_oop_stack.clear(true); |
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508 _marking_stack.clear(); |
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509 _objarray_stack.clear(true); |
0 | 510 } |
511 | |
512 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
513 // Recursively traverse all live objects and mark them | |
10405 | 514 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 515 trace(" 1"); |
516 | |
517 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
518 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
519 | |
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520 // Need to clear claim bits before the tracing starts. |
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521 ClassLoaderDataGraph::clear_claimed_marks(); |
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522 |
0 | 523 // General strong roots. |
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524 { |
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525 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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526 Universe::oops_do(mark_and_push_closure()); |
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527 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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528 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
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529 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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530 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
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531 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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532 FlatProfiler::oops_do(mark_and_push_closure()); |
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533 Management::oops_do(mark_and_push_closure()); |
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534 JvmtiExport::oops_do(mark_and_push_closure()); |
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535 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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536 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
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537 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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538 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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539 } |
0 | 540 |
541 // Flush marking stack. | |
542 follow_stack(); | |
543 | |
544 // Process reference objects found during marking | |
545 { | |
457
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546 ref_processor()->setup_policy(clear_all_softrefs); |
10405 | 547 const ReferenceProcessorStats& stats = |
548 ref_processor()->process_discovered_references( | |
549 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer); | |
550 gc_tracer()->report_gc_reference_stats(stats); | |
0 | 551 } |
552 | |
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553 // This is the point where the entire marking should have completed. |
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554 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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555 |
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556 // Unload classes and purge the SystemDictionary. |
0 | 557 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
558 | |
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559 // Unload nmethods. |
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560 CodeCache::do_unloading(is_alive_closure(), purged_class); |
0 | 561 |
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562 // Prune dead klasses from subklass/sibling/implementor lists. |
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563 Klass::clean_weak_klass_links(is_alive_closure()); |
941 | 564 |
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565 // Delete entries for dead interned strings. |
0 | 566 StringTable::unlink(is_alive_closure()); |
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567 |
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568 // Clean up unreferenced symbols in symbol table. |
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569 SymbolTable::unlink(); |
10405 | 570 _gc_tracer->report_object_count_after_gc(is_alive_closure()); |
0 | 571 } |
572 | |
573 | |
574 void PSMarkSweep::mark_sweep_phase2() { | |
10405 | 575 GCTraceTime tm("phase 2", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 576 trace("2"); |
577 | |
578 // Now all live objects are marked, compute the new object addresses. | |
579 | |
580 // It is not required that we traverse spaces in the same order in | |
581 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
582 // tracking expects us to do so. See comment under phase4. | |
583 | |
584 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
585 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
586 | |
587 PSOldGen* old_gen = heap->old_gen(); | |
588 | |
589 // Begin compacting into the old gen | |
590 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
591 | |
592 // This will also compact the young gen spaces. | |
593 old_gen->precompact(); | |
594 } | |
595 | |
596 // This should be moved to the shared markSweep code! | |
597 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
598 public: | |
599 bool do_object_b(oop p) { return true; } | |
600 }; | |
601 static PSAlwaysTrueClosure always_true; | |
602 | |
603 void PSMarkSweep::mark_sweep_phase3() { | |
604 // Adjust the pointers to reflect the new locations | |
10405 | 605 GCTraceTime tm("phase 3", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 606 trace("3"); |
607 | |
608 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
609 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
610 | |
611 PSYoungGen* young_gen = heap->young_gen(); | |
612 PSOldGen* old_gen = heap->old_gen(); | |
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613 |
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614 // Need to clear claim bits before the tracing starts. |
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615 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 616 |
617 // General strong roots. | |
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618 Universe::oops_do(adjust_pointer_closure()); |
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619 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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620 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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621 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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622 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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623 FlatProfiler::oops_do(adjust_pointer_closure()); |
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624 Management::oops_do(adjust_pointer_closure()); |
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625 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 626 // SO_AllClasses |
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627 SystemDictionary::oops_do(adjust_pointer_closure()); |
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628 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 629 |
630 // Now adjust pointers in remaining weak roots. (All of which should | |
631 // have been cleared if they pointed to non-surviving objects.) | |
632 // Global (weak) JNI handles | |
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633 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 634 |
635 CodeCache::oops_do(adjust_pointer_closure()); | |
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636 StringTable::oops_do(adjust_pointer_closure()); |
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637 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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638 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 639 |
640 adjust_marks(); | |
641 | |
642 young_gen->adjust_pointers(); | |
643 old_gen->adjust_pointers(); | |
644 } | |
645 | |
646 void PSMarkSweep::mark_sweep_phase4() { | |
647 EventMark m("4 compact heap"); | |
10405 | 648 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 649 trace("4"); |
650 | |
651 // All pointers are now adjusted, move objects accordingly | |
652 | |
653 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
654 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
655 | |
656 PSYoungGen* young_gen = heap->young_gen(); | |
657 PSOldGen* old_gen = heap->old_gen(); | |
658 | |
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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678 // os::javaTimeMillis() does not guarantee monotonicity. |
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679 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 680 } |