Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10810:4e1db4c9d4c5
Support data patches for values larger than long.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 18 Jul 2013 15:37:02 +0200 |
parents | f2110083203d |
children | c49c7f835e8d |
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/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" | |
10405 | 37 #include "gc_implementation/shared/gcHeapSummary.hpp" |
38 #include "gc_implementation/shared/gcTimer.hpp" | |
39 #include "gc_implementation/shared/gcTrace.hpp" | |
40 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 41 #include "gc_implementation/shared/isGCActiveMark.hpp" |
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42 #include "gc_implementation/shared/markSweep.hpp" |
1972 | 43 #include "gc_implementation/shared/spaceDecorator.hpp" |
44 #include "gc_interface/gcCause.hpp" | |
45 #include "memory/gcLocker.inline.hpp" | |
46 #include "memory/referencePolicy.hpp" | |
47 #include "memory/referenceProcessor.hpp" | |
48 #include "oops/oop.inline.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/fprofiler.hpp" | |
51 #include "runtime/safepoint.hpp" | |
52 #include "runtime/vmThread.hpp" | |
53 #include "services/management.hpp" | |
54 #include "services/memoryService.hpp" | |
55 #include "utilities/events.hpp" | |
56 #include "utilities/stack.inline.hpp" | |
0 | 57 |
58 elapsedTimer PSMarkSweep::_accumulated_time; | |
59 jlong PSMarkSweep::_time_of_last_gc = 0; | |
60 CollectorCounters* PSMarkSweep::_counters = NULL; | |
61 | |
62 void PSMarkSweep::initialize() { | |
63 MemRegion mr = Universe::heap()->reserved_region(); | |
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64 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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65 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 66 } |
67 | |
68 // This method contains all heap specific policy for invoking mark sweep. | |
69 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
70 // the heap. It will do nothing further. If we need to bail out for policy | |
71 // reasons, scavenge before full gc, or any other specialized behavior, it | |
72 // needs to be added here. | |
73 // | |
74 // Note that this method should only be called from the vm_thread while | |
75 // at a safepoint! | |
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76 // |
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77 // Note that the all_soft_refs_clear flag in the collector policy |
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78 // may be true because this method can be called without intervening |
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79 // activity. For example when the heap space is tight and full measure |
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80 // are being taken to free space. |
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81 |
0 | 82 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
83 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
84 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
85 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
86 | |
87 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
88 GCCause::Cause gc_cause = heap->gc_cause(); | |
89 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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90 IsGCActiveMark mark; |
0 | 91 |
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92 if (ScavengeBeforeFullGC) { |
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93 PSScavenge::invoke_no_policy(); |
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94 } |
0 | 95 |
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96 const bool clear_all_soft_refs = |
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97 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 98 |
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99 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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100 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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101 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 102 } |
103 | |
104 // This method contains no policy. You should probably | |
105 // be calling invoke() instead. | |
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106 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 107 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
108 assert(ref_processor() != NULL, "Sanity"); | |
109 | |
110 if (GC_locker::check_active_before_gc()) { | |
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111 return false; |
0 | 112 } |
113 | |
114 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
10405 | 115 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
0 | 116 GCCause::Cause gc_cause = heap->gc_cause(); |
10405 | 117 |
118 _gc_timer->register_gc_start(os::elapsed_counter()); | |
119 _gc_tracer->report_gc_start(gc_cause, _gc_timer->gc_start()); | |
120 | |
0 | 121 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); |
122 | |
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123 // The scope of casr should end after code that can change |
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124 // CollectorPolicy::_should_clear_all_soft_refs. |
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125 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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126 |
0 | 127 PSYoungGen* young_gen = heap->young_gen(); |
128 PSOldGen* old_gen = heap->old_gen(); | |
129 | |
130 // Increment the invocation count | |
131 heap->increment_total_collections(true /* full */); | |
132 | |
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133 // Save information needed to minimize mangling |
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134 heap->record_gen_tops_before_GC(); |
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135 |
0 | 136 // We need to track unique mark sweep invocations as well. |
137 _total_invocations++; | |
138 | |
139 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
140 | |
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141 heap->print_heap_before_gc(); |
10405 | 142 heap->trace_heap_before_gc(_gc_tracer); |
0 | 143 |
144 // Fill in TLABs | |
145 heap->accumulate_statistics_all_tlabs(); | |
146 heap->ensure_parsability(true); // retire TLABs | |
147 | |
148 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
149 HandleMark hm; // Discard invalid handles created during verification | |
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150 Universe::verify(" VerifyBeforeGC:"); |
0 | 151 } |
152 | |
153 // Verify object start arrays | |
154 if (VerifyObjectStartArray && | |
155 VerifyBeforeGC) { | |
156 old_gen->verify_object_start_array(); | |
157 } | |
158 | |
10405 | 159 heap->pre_full_gc_dump(_gc_timer); |
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160 |
0 | 161 // Filled in below to track the state of the young gen after the collection. |
162 bool eden_empty; | |
163 bool survivors_empty; | |
164 bool young_gen_empty; | |
165 | |
166 { | |
167 HandleMark hm; | |
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168 |
0 | 169 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
170 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
10405 | 171 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
0 | 172 TraceCollectorStats tcs(counters()); |
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173 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 174 |
175 if (TraceGen1Time) accumulated_time()->start(); | |
176 | |
177 // Let the size policy know we're starting | |
178 size_policy->major_collection_begin(); | |
179 | |
180 CodeCache::gc_prologue(); | |
181 Threads::gc_prologue(); | |
182 BiasedLocking::preserve_marks(); | |
183 | |
184 // Capture heap size before collection for printing. | |
185 size_t prev_used = heap->used(); | |
186 | |
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187 // Capture metadata size before collection for sizing. |
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188 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
0 | 189 |
190 // For PrintGCDetails | |
191 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
192 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
193 | |
194 allocate_stacks(); | |
195 | |
196 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
197 | |
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198 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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199 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 200 |
201 mark_sweep_phase1(clear_all_softrefs); | |
202 | |
203 mark_sweep_phase2(); | |
204 | |
205 // Don't add any more derived pointers during phase3 | |
206 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
207 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
208 | |
209 mark_sweep_phase3(); | |
210 | |
211 mark_sweep_phase4(); | |
212 | |
213 restore_marks(); | |
214 | |
215 deallocate_stacks(); | |
216 | |
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217 if (ZapUnusedHeapArea) { |
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218 // Do a complete mangle (top to end) because the usage for |
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219 // scratch does not maintain a top pointer. |
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220 young_gen->to_space()->mangle_unused_area_complete(); |
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221 } |
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222 |
0 | 223 eden_empty = young_gen->eden_space()->is_empty(); |
224 if (!eden_empty) { | |
225 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
226 } | |
227 | |
228 // Update heap occupancy information which is used as | |
229 // input to soft ref clearing policy at the next gc. | |
230 Universe::update_heap_info_at_gc(); | |
231 | |
232 survivors_empty = young_gen->from_space()->is_empty() && | |
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233 young_gen->to_space()->is_empty(); |
0 | 234 young_gen_empty = eden_empty && survivors_empty; |
235 | |
236 BarrierSet* bs = heap->barrier_set(); | |
237 if (bs->is_a(BarrierSet::ModRef)) { | |
238 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
239 MemRegion old_mr = heap->old_gen()->reserved(); | |
240 if (young_gen_empty) { | |
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241 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 242 } else { |
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243 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 244 } |
245 } | |
246 | |
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247 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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248 ClassLoaderDataGraph::purge(); |
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249 MetaspaceAux::verify_metrics(); |
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250 |
0 | 251 BiasedLocking::restore_marks(); |
252 Threads::gc_epilogue(); | |
253 CodeCache::gc_epilogue(); | |
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254 JvmtiExport::gc_epilogue(); |
0 | 255 |
256 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
257 | |
258 ref_processor()->enqueue_discovered_references(NULL); | |
259 | |
260 // Update time of last GC | |
261 reset_millis_since_last_gc(); | |
262 | |
263 // Let the size policy know we're done | |
264 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
265 | |
266 if (UseAdaptiveSizePolicy) { | |
267 | |
268 if (PrintAdaptiveSizePolicy) { | |
269 gclog_or_tty->print("AdaptiveSizeStart: "); | |
270 gclog_or_tty->stamp(); | |
271 gclog_or_tty->print_cr(" collection: %d ", | |
272 heap->total_collections()); | |
273 if (Verbose) { | |
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274 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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275 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 276 } |
277 } | |
278 | |
279 // Don't check if the size_policy is ready here. Let | |
280 // the size_policy check that internally. | |
281 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
282 ((gc_cause != GCCause::_java_lang_system_gc) || | |
283 UseAdaptiveSizePolicyWithSystemGC)) { | |
284 // Calculate optimal free space amounts | |
285 assert(young_gen->max_size() > | |
286 young_gen->from_space()->capacity_in_bytes() + | |
287 young_gen->to_space()->capacity_in_bytes(), | |
288 "Sizes of space in young gen are out-of-bounds"); | |
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289 |
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290 size_t young_live = young_gen->used_in_bytes(); |
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291 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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292 size_t old_live = old_gen->used_in_bytes(); |
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293 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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294 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 295 size_t max_eden_size = young_gen->max_size() - |
296 young_gen->from_space()->capacity_in_bytes() - | |
297 young_gen->to_space()->capacity_in_bytes(); | |
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298 |
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299 // Used for diagnostics |
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300 size_policy->clear_generation_free_space_flags(); |
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301 |
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302 size_policy->compute_generations_free_space(young_live, |
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303 eden_live, |
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304 old_live, |
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305 cur_eden, |
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306 max_old_gen_size, |
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307 max_eden_size, |
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308 true /* full gc*/); |
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309 |
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310 size_policy->check_gc_overhead_limit(young_live, |
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311 eden_live, |
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312 max_old_gen_size, |
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313 max_eden_size, |
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314 true /* full gc*/, |
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315 gc_cause, |
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316 heap->collector_policy()); |
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317 |
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318 size_policy->decay_supplemental_growth(true /* full gc*/); |
0 | 319 |
320 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
321 | |
322 // Don't resize the young generation at an major collection. A | |
323 // desired young generation size may have been calculated but | |
324 // resizing the young generation complicates the code because the | |
325 // resizing of the old generation may have moved the boundary | |
326 // between the young generation and the old generation. Let the | |
327 // young generation resizing happen at the minor collections. | |
328 } | |
329 if (PrintAdaptiveSizePolicy) { | |
330 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
331 heap->total_collections()); | |
332 } | |
333 } | |
334 | |
335 if (UsePerfData) { | |
336 heap->gc_policy_counters()->update_counters(); | |
337 heap->gc_policy_counters()->update_old_capacity( | |
338 old_gen->capacity_in_bytes()); | |
339 heap->gc_policy_counters()->update_young_capacity( | |
340 young_gen->capacity_in_bytes()); | |
341 } | |
342 | |
343 heap->resize_all_tlabs(); | |
344 | |
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345 // We collected the heap, recalculate the metaspace capacity |
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346 MetaspaceGC::compute_new_size(); |
0 | 347 |
348 if (TraceGen1Time) accumulated_time()->stop(); | |
349 | |
350 if (PrintGC) { | |
351 if (PrintGCDetails) { | |
352 // Don't print a GC timestamp here. This is after the GC so | |
353 // would be confusing. | |
354 young_gen->print_used_change(young_gen_prev_used); | |
355 old_gen->print_used_change(old_gen_prev_used); | |
356 } | |
357 heap->print_heap_change(prev_used); | |
358 if (PrintGCDetails) { | |
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359 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 360 } |
361 } | |
362 | |
363 // Track memory usage and detect low memory | |
364 MemoryService::track_memory_usage(); | |
365 heap->update_counters(); | |
366 } | |
367 | |
368 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
369 HandleMark hm; // Discard invalid handles created during verification | |
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370 Universe::verify(" VerifyAfterGC:"); |
0 | 371 } |
372 | |
373 // Re-verify object start arrays | |
374 if (VerifyObjectStartArray && | |
375 VerifyAfterGC) { | |
376 old_gen->verify_object_start_array(); | |
377 } | |
378 | |
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379 if (ZapUnusedHeapArea) { |
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380 old_gen->object_space()->check_mangled_unused_area_complete(); |
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381 } |
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382 |
0 | 383 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
384 | |
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385 heap->print_heap_after_gc(); |
10405 | 386 heap->trace_heap_after_gc(_gc_tracer); |
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387 |
10405 | 388 heap->post_full_gc_dump(_gc_timer); |
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389 |
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390 #ifdef TRACESPINNING |
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391 ParallelTaskTerminator::print_termination_counts(); |
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392 #endif |
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393 |
10405 | 394 _gc_timer->register_gc_end(os::elapsed_counter()); |
395 | |
396 _gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
397 | |
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398 return true; |
0 | 399 } |
400 | |
401 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
402 PSYoungGen* young_gen, | |
403 PSOldGen* old_gen) { | |
404 MutableSpace* const eden_space = young_gen->eden_space(); | |
405 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
406 assert(young_gen->virtual_space()->alignment() == | |
407 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
408 | |
409 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
410 return false; | |
411 } | |
412 | |
413 // Both generations must be completely committed. | |
414 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
415 return false; | |
416 } | |
417 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
418 return false; | |
419 } | |
420 | |
421 // Figure out how much to take from eden. Include the average amount promoted | |
422 // in the total; otherwise the next young gen GC will simply bail out to a | |
423 // full GC. | |
424 const size_t alignment = old_gen->virtual_space()->alignment(); | |
425 const size_t eden_used = eden_space->used_in_bytes(); | |
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426 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 427 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
428 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
429 | |
430 if (absorb_size >= eden_capacity) { | |
431 return false; // Must leave some space in eden. | |
432 } | |
433 | |
434 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
435 if (new_young_size < young_gen->min_gen_size()) { | |
436 return false; // Respect young gen minimum size. | |
437 } | |
438 | |
439 if (TraceAdaptiveGCBoundary && Verbose) { | |
440 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
441 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
442 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
443 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
444 absorb_size / K, | |
445 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
446 young_gen->from_space()->used_in_bytes() / K, | |
447 young_gen->to_space()->used_in_bytes() / K, | |
448 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
449 } | |
450 | |
451 // Fill the unused part of the old gen. | |
452 MutableSpace* const old_space = old_gen->object_space(); | |
481
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453 HeapWord* const unused_start = old_space->top(); |
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454 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 455 |
481
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456 if (unused_words > 0) { |
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457 if (unused_words < CollectedHeap::min_fill_size()) { |
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458 return false; // If the old gen cannot be filled, must give up. |
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459 } |
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460 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 461 } |
462 | |
463 // Take the live data from eden and set both top and end in the old gen to | |
464 // eden top. (Need to set end because reset_after_change() mangles the region | |
465 // from end to virtual_space->high() in debug builds). | |
466 HeapWord* const new_top = eden_space->top(); | |
467 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
468 absorb_size); | |
469 young_gen->reset_after_change(); | |
470 old_space->set_top(new_top); | |
471 old_space->set_end(new_top); | |
472 old_gen->reset_after_change(); | |
473 | |
474 // Update the object start array for the filler object and the data from eden. | |
475 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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476 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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477 start_array->allocate_block(p); |
0 | 478 } |
479 | |
480 // Could update the promoted average here, but it is not typically updated at | |
481 // full GCs and the value to use is unclear. Something like | |
482 // | |
483 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
484 | |
485 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
486 return true; | |
487 } | |
488 | |
489 void PSMarkSweep::allocate_stacks() { | |
490 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
491 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
492 | |
493 PSYoungGen* young_gen = heap->young_gen(); | |
494 | |
495 MutableSpace* to_space = young_gen->to_space(); | |
496 _preserved_marks = (PreservedMark*)to_space->top(); | |
497 _preserved_count = 0; | |
498 | |
499 // We want to calculate the size in bytes first. | |
500 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
501 // Now divide by the size of a PreservedMark | |
502 _preserved_count_max /= sizeof(PreservedMark); | |
503 } | |
504 | |
505 | |
506 void PSMarkSweep::deallocate_stacks() { | |
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507 _preserved_mark_stack.clear(true); |
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508 _preserved_oop_stack.clear(true); |
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509 _marking_stack.clear(); |
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510 _objarray_stack.clear(true); |
0 | 511 } |
512 | |
513 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
514 // Recursively traverse all live objects and mark them | |
10405 | 515 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 516 trace(" 1"); |
517 | |
518 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
519 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
520 | |
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521 // Need to clear claim bits before the tracing starts. |
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522 ClassLoaderDataGraph::clear_claimed_marks(); |
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523 |
0 | 524 // General strong roots. |
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525 { |
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526 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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527 Universe::oops_do(mark_and_push_closure()); |
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528 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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529 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
989
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530 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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531 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
989
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532 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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533 FlatProfiler::oops_do(mark_and_push_closure()); |
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534 Management::oops_do(mark_and_push_closure()); |
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535 JvmtiExport::oops_do(mark_and_push_closure()); |
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536 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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537 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
989
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538 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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539 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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540 } |
0 | 541 |
542 // Flush marking stack. | |
543 follow_stack(); | |
544 | |
545 // Process reference objects found during marking | |
546 { | |
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547 ref_processor()->setup_policy(clear_all_softrefs); |
10405 | 548 const ReferenceProcessorStats& stats = |
549 ref_processor()->process_discovered_references( | |
550 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer); | |
551 gc_tracer()->report_gc_reference_stats(stats); | |
0 | 552 } |
553 | |
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554 // This is the point where the entire marking should have completed. |
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555 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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556 |
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557 // Unload classes and purge the SystemDictionary. |
0 | 558 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
559 | |
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560 // Unload nmethods. |
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561 CodeCache::do_unloading(is_alive_closure(), purged_class); |
0 | 562 |
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563 // Prune dead klasses from subklass/sibling/implementor lists. |
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564 Klass::clean_weak_klass_links(is_alive_closure()); |
941 | 565 |
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566 // Delete entries for dead interned strings. |
0 | 567 StringTable::unlink(is_alive_closure()); |
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568 |
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569 // Clean up unreferenced symbols in symbol table. |
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570 SymbolTable::unlink(); |
10405 | 571 _gc_tracer->report_object_count_after_gc(is_alive_closure()); |
0 | 572 } |
573 | |
574 | |
575 void PSMarkSweep::mark_sweep_phase2() { | |
10405 | 576 GCTraceTime tm("phase 2", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 577 trace("2"); |
578 | |
579 // Now all live objects are marked, compute the new object addresses. | |
580 | |
581 // It is not required that we traverse spaces in the same order in | |
582 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
583 // tracking expects us to do so. See comment under phase4. | |
584 | |
585 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
586 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
587 | |
588 PSOldGen* old_gen = heap->old_gen(); | |
589 | |
590 // Begin compacting into the old gen | |
591 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
592 | |
593 // This will also compact the young gen spaces. | |
594 old_gen->precompact(); | |
595 } | |
596 | |
597 // This should be moved to the shared markSweep code! | |
598 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
599 public: | |
600 bool do_object_b(oop p) { return true; } | |
601 }; | |
602 static PSAlwaysTrueClosure always_true; | |
603 | |
604 void PSMarkSweep::mark_sweep_phase3() { | |
605 // Adjust the pointers to reflect the new locations | |
10405 | 606 GCTraceTime tm("phase 3", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 607 trace("3"); |
608 | |
609 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
610 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
611 | |
612 PSYoungGen* young_gen = heap->young_gen(); | |
613 PSOldGen* old_gen = heap->old_gen(); | |
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614 |
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615 // Need to clear claim bits before the tracing starts. |
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616 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 617 |
618 // General strong roots. | |
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619 Universe::oops_do(adjust_pointer_closure()); |
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620 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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621 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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622 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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623 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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624 FlatProfiler::oops_do(adjust_pointer_closure()); |
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625 Management::oops_do(adjust_pointer_closure()); |
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626 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 627 // SO_AllClasses |
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628 SystemDictionary::oops_do(adjust_pointer_closure()); |
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629 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 630 |
631 // Now adjust pointers in remaining weak roots. (All of which should | |
632 // have been cleared if they pointed to non-surviving objects.) | |
633 // Global (weak) JNI handles | |
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634 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 635 |
636 CodeCache::oops_do(adjust_pointer_closure()); | |
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637 StringTable::oops_do(adjust_pointer_closure()); |
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638 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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639 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 640 |
641 adjust_marks(); | |
642 | |
643 young_gen->adjust_pointers(); | |
644 old_gen->adjust_pointers(); | |
645 } | |
646 | |
647 void PSMarkSweep::mark_sweep_phase4() { | |
648 EventMark m("4 compact heap"); | |
10405 | 649 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer); |
0 | 650 trace("4"); |
651 | |
652 // All pointers are now adjusted, move objects accordingly | |
653 | |
654 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
655 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
656 | |
657 PSYoungGen* young_gen = heap->young_gen(); | |
658 PSOldGen* old_gen = heap->old_gen(); | |
659 | |
660 old_gen->compact(); | |
661 young_gen->compact(); | |
662 } | |
663 | |
664 jlong PSMarkSweep::millis_since_last_gc() { | |
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665 // We need a monotonically non-deccreasing time in ms but |
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666 // os::javaTimeMillis() does not guarantee monotonicity. |
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667 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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668 jlong ret_val = now - _time_of_last_gc; |
0 | 669 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
670 if (ret_val < 0) { | |
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671 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 672 return 0; |
673 } | |
674 return ret_val; | |
675 } | |
676 | |
677 void PSMarkSweep::reset_millis_since_last_gc() { | |
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678 // We need a monotonically non-deccreasing time in ms but |
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679 // os::javaTimeMillis() does not guarantee monotonicity. |
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680 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 681 } |