Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10370:47bdfb3d010f
8015486: PSScavenge::is_obj_in_young is unnecessarily slow with UseCompressedOops
Summary: Compare compressed oops to a compressed young gen boundary instead of uncompressing the oops before doing the young gen boundary check.
Reviewed-by: brutisso, jmasa
author | stefank |
---|---|
date | Thu, 30 May 2013 10:58:16 +0200 |
parents | 14d3f71f831d |
children | f2110083203d |
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" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
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38 #include "gc_implementation/shared/markSweep.hpp" |
1972 | 39 #include "gc_implementation/shared/spaceDecorator.hpp" |
40 #include "gc_interface/gcCause.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "runtime/biasedLocking.hpp" | |
46 #include "runtime/fprofiler.hpp" | |
47 #include "runtime/safepoint.hpp" | |
48 #include "runtime/vmThread.hpp" | |
49 #include "services/management.hpp" | |
50 #include "services/memoryService.hpp" | |
51 #include "utilities/events.hpp" | |
52 #include "utilities/stack.inline.hpp" | |
0 | 53 |
54 elapsedTimer PSMarkSweep::_accumulated_time; | |
55 jlong PSMarkSweep::_time_of_last_gc = 0; | |
56 CollectorCounters* PSMarkSweep::_counters = NULL; | |
57 | |
58 void PSMarkSweep::initialize() { | |
59 MemRegion mr = Universe::heap()->reserved_region(); | |
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60 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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61 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 62 } |
63 | |
64 // This method contains all heap specific policy for invoking mark sweep. | |
65 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
66 // the heap. It will do nothing further. If we need to bail out for policy | |
67 // reasons, scavenge before full gc, or any other specialized behavior, it | |
68 // needs to be added here. | |
69 // | |
70 // Note that this method should only be called from the vm_thread while | |
71 // at a safepoint! | |
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72 // |
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73 // Note that the all_soft_refs_clear flag in the collector policy |
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74 // may be true because this method can be called without intervening |
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75 // activity. For example when the heap space is tight and full measure |
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76 // are being taken to free space. |
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77 |
0 | 78 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
79 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
80 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
81 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
82 | |
83 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
84 GCCause::Cause gc_cause = heap->gc_cause(); | |
85 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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86 IsGCActiveMark mark; |
0 | 87 |
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88 if (ScavengeBeforeFullGC) { |
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89 PSScavenge::invoke_no_policy(); |
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90 } |
0 | 91 |
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92 const bool clear_all_soft_refs = |
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93 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 94 |
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95 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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96 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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97 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 98 } |
99 | |
100 // This method contains no policy. You should probably | |
101 // be calling invoke() instead. | |
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102 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 103 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
104 assert(ref_processor() != NULL, "Sanity"); | |
105 | |
106 if (GC_locker::check_active_before_gc()) { | |
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107 return false; |
0 | 108 } |
109 | |
110 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
111 GCCause::Cause gc_cause = heap->gc_cause(); | |
112 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
113 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
114 | |
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115 // The scope of casr should end after code that can change |
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116 // CollectorPolicy::_should_clear_all_soft_refs. |
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117 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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118 |
0 | 119 PSYoungGen* young_gen = heap->young_gen(); |
120 PSOldGen* old_gen = heap->old_gen(); | |
121 | |
122 // Increment the invocation count | |
123 heap->increment_total_collections(true /* full */); | |
124 | |
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125 // Save information needed to minimize mangling |
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126 heap->record_gen_tops_before_GC(); |
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127 |
0 | 128 // We need to track unique mark sweep invocations as well. |
129 _total_invocations++; | |
130 | |
131 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
132 | |
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133 heap->print_heap_before_gc(); |
0 | 134 |
135 // Fill in TLABs | |
136 heap->accumulate_statistics_all_tlabs(); | |
137 heap->ensure_parsability(true); // retire TLABs | |
138 | |
139 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
140 HandleMark hm; // Discard invalid handles created during verification | |
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141 Universe::verify(" VerifyBeforeGC:"); |
0 | 142 } |
143 | |
144 // Verify object start arrays | |
145 if (VerifyObjectStartArray && | |
146 VerifyBeforeGC) { | |
147 old_gen->verify_object_start_array(); | |
148 } | |
149 | |
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150 heap->pre_full_gc_dump(); |
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151 |
0 | 152 // Filled in below to track the state of the young gen after the collection. |
153 bool eden_empty; | |
154 bool survivors_empty; | |
155 bool young_gen_empty; | |
156 | |
157 { | |
158 HandleMark hm; | |
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159 |
0 | 160 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
161 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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162 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 163 TraceCollectorStats tcs(counters()); |
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164 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 165 |
166 if (TraceGen1Time) accumulated_time()->start(); | |
167 | |
168 // Let the size policy know we're starting | |
169 size_policy->major_collection_begin(); | |
170 | |
171 CodeCache::gc_prologue(); | |
172 Threads::gc_prologue(); | |
173 BiasedLocking::preserve_marks(); | |
174 | |
175 // Capture heap size before collection for printing. | |
176 size_t prev_used = heap->used(); | |
177 | |
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178 // Capture metadata size before collection for sizing. |
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179 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
0 | 180 |
181 // For PrintGCDetails | |
182 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
183 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
184 | |
185 allocate_stacks(); | |
186 | |
187 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
188 | |
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189 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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190 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 191 |
192 mark_sweep_phase1(clear_all_softrefs); | |
193 | |
194 mark_sweep_phase2(); | |
195 | |
196 // Don't add any more derived pointers during phase3 | |
197 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
198 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
199 | |
200 mark_sweep_phase3(); | |
201 | |
202 mark_sweep_phase4(); | |
203 | |
204 restore_marks(); | |
205 | |
206 deallocate_stacks(); | |
207 | |
263
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208 if (ZapUnusedHeapArea) { |
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209 // Do a complete mangle (top to end) because the usage for |
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210 // scratch does not maintain a top pointer. |
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211 young_gen->to_space()->mangle_unused_area_complete(); |
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212 } |
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213 |
0 | 214 eden_empty = young_gen->eden_space()->is_empty(); |
215 if (!eden_empty) { | |
216 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
217 } | |
218 | |
219 // Update heap occupancy information which is used as | |
220 // input to soft ref clearing policy at the next gc. | |
221 Universe::update_heap_info_at_gc(); | |
222 | |
223 survivors_empty = young_gen->from_space()->is_empty() && | |
263
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224 young_gen->to_space()->is_empty(); |
0 | 225 young_gen_empty = eden_empty && survivors_empty; |
226 | |
227 BarrierSet* bs = heap->barrier_set(); | |
228 if (bs->is_a(BarrierSet::ModRef)) { | |
229 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
230 MemRegion old_mr = heap->old_gen()->reserved(); | |
231 if (young_gen_empty) { | |
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232 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 233 } else { |
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234 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 235 } |
236 } | |
237 | |
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238 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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239 ClassLoaderDataGraph::purge(); |
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240 MetaspaceAux::verify_metrics(); |
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241 |
0 | 242 BiasedLocking::restore_marks(); |
243 Threads::gc_epilogue(); | |
244 CodeCache::gc_epilogue(); | |
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245 JvmtiExport::gc_epilogue(); |
0 | 246 |
247 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
248 | |
249 ref_processor()->enqueue_discovered_references(NULL); | |
250 | |
251 // Update time of last GC | |
252 reset_millis_since_last_gc(); | |
253 | |
254 // Let the size policy know we're done | |
255 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
256 | |
257 if (UseAdaptiveSizePolicy) { | |
258 | |
259 if (PrintAdaptiveSizePolicy) { | |
260 gclog_or_tty->print("AdaptiveSizeStart: "); | |
261 gclog_or_tty->stamp(); | |
262 gclog_or_tty->print_cr(" collection: %d ", | |
263 heap->total_collections()); | |
264 if (Verbose) { | |
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265 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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266 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 267 } |
268 } | |
269 | |
270 // Don't check if the size_policy is ready here. Let | |
271 // the size_policy check that internally. | |
272 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
273 ((gc_cause != GCCause::_java_lang_system_gc) || | |
274 UseAdaptiveSizePolicyWithSystemGC)) { | |
275 // Calculate optimal free space amounts | |
276 assert(young_gen->max_size() > | |
277 young_gen->from_space()->capacity_in_bytes() + | |
278 young_gen->to_space()->capacity_in_bytes(), | |
279 "Sizes of space in young gen are out-of-bounds"); | |
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280 |
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281 size_t young_live = young_gen->used_in_bytes(); |
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282 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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283 size_t old_live = old_gen->used_in_bytes(); |
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284 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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285 size_t max_old_gen_size = old_gen->max_gen_size(); |
0 | 286 size_t max_eden_size = young_gen->max_size() - |
287 young_gen->from_space()->capacity_in_bytes() - | |
288 young_gen->to_space()->capacity_in_bytes(); | |
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289 |
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290 // Used for diagnostics |
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291 size_policy->clear_generation_free_space_flags(); |
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292 |
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293 size_policy->compute_generations_free_space(young_live, |
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294 eden_live, |
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295 old_live, |
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296 cur_eden, |
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297 max_old_gen_size, |
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298 max_eden_size, |
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299 true /* full gc*/); |
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300 |
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301 size_policy->check_gc_overhead_limit(young_live, |
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302 eden_live, |
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303 max_old_gen_size, |
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304 max_eden_size, |
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305 true /* full gc*/, |
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306 gc_cause, |
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307 heap->collector_policy()); |
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308 |
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309 size_policy->decay_supplemental_growth(true /* full gc*/); |
0 | 310 |
311 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
312 | |
313 // Don't resize the young generation at an major collection. A | |
314 // desired young generation size may have been calculated but | |
315 // resizing the young generation complicates the code because the | |
316 // resizing of the old generation may have moved the boundary | |
317 // between the young generation and the old generation. Let the | |
318 // young generation resizing happen at the minor collections. | |
319 } | |
320 if (PrintAdaptiveSizePolicy) { | |
321 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
322 heap->total_collections()); | |
323 } | |
324 } | |
325 | |
326 if (UsePerfData) { | |
327 heap->gc_policy_counters()->update_counters(); | |
328 heap->gc_policy_counters()->update_old_capacity( | |
329 old_gen->capacity_in_bytes()); | |
330 heap->gc_policy_counters()->update_young_capacity( | |
331 young_gen->capacity_in_bytes()); | |
332 } | |
333 | |
334 heap->resize_all_tlabs(); | |
335 | |
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336 // We collected the heap, recalculate the metaspace capacity |
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337 MetaspaceGC::compute_new_size(); |
0 | 338 |
339 if (TraceGen1Time) accumulated_time()->stop(); | |
340 | |
341 if (PrintGC) { | |
342 if (PrintGCDetails) { | |
343 // Don't print a GC timestamp here. This is after the GC so | |
344 // would be confusing. | |
345 young_gen->print_used_change(young_gen_prev_used); | |
346 old_gen->print_used_change(old_gen_prev_used); | |
347 } | |
348 heap->print_heap_change(prev_used); | |
349 if (PrintGCDetails) { | |
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350 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 351 } |
352 } | |
353 | |
354 // Track memory usage and detect low memory | |
355 MemoryService::track_memory_usage(); | |
356 heap->update_counters(); | |
357 } | |
358 | |
359 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
360 HandleMark hm; // Discard invalid handles created during verification | |
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361 Universe::verify(" VerifyAfterGC:"); |
0 | 362 } |
363 | |
364 // Re-verify object start arrays | |
365 if (VerifyObjectStartArray && | |
366 VerifyAfterGC) { | |
367 old_gen->verify_object_start_array(); | |
368 } | |
369 | |
263
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370 if (ZapUnusedHeapArea) { |
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371 old_gen->object_space()->check_mangled_unused_area_complete(); |
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372 } |
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373 |
0 | 374 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
375 | |
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376 heap->print_heap_after_gc(); |
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377 |
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378 heap->post_full_gc_dump(); |
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379 |
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380 #ifdef TRACESPINNING |
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381 ParallelTaskTerminator::print_termination_counts(); |
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382 #endif |
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383 |
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384 return true; |
0 | 385 } |
386 | |
387 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
388 PSYoungGen* young_gen, | |
389 PSOldGen* old_gen) { | |
390 MutableSpace* const eden_space = young_gen->eden_space(); | |
391 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
392 assert(young_gen->virtual_space()->alignment() == | |
393 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
394 | |
395 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
396 return false; | |
397 } | |
398 | |
399 // Both generations must be completely committed. | |
400 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
401 return false; | |
402 } | |
403 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
404 return false; | |
405 } | |
406 | |
407 // Figure out how much to take from eden. Include the average amount promoted | |
408 // in the total; otherwise the next young gen GC will simply bail out to a | |
409 // full GC. | |
410 const size_t alignment = old_gen->virtual_space()->alignment(); | |
411 const size_t eden_used = eden_space->used_in_bytes(); | |
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412 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 413 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
414 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
415 | |
416 if (absorb_size >= eden_capacity) { | |
417 return false; // Must leave some space in eden. | |
418 } | |
419 | |
420 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
421 if (new_young_size < young_gen->min_gen_size()) { | |
422 return false; // Respect young gen minimum size. | |
423 } | |
424 | |
425 if (TraceAdaptiveGCBoundary && Verbose) { | |
426 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
427 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
428 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
429 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
430 absorb_size / K, | |
431 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
432 young_gen->from_space()->used_in_bytes() / K, | |
433 young_gen->to_space()->used_in_bytes() / K, | |
434 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
435 } | |
436 | |
437 // Fill the unused part of the old gen. | |
438 MutableSpace* const old_space = old_gen->object_space(); | |
481
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439 HeapWord* const unused_start = old_space->top(); |
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440 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 441 |
481
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442 if (unused_words > 0) { |
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443 if (unused_words < CollectedHeap::min_fill_size()) { |
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444 return false; // If the old gen cannot be filled, must give up. |
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445 } |
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446 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 447 } |
448 | |
449 // Take the live data from eden and set both top and end in the old gen to | |
450 // eden top. (Need to set end because reset_after_change() mangles the region | |
451 // from end to virtual_space->high() in debug builds). | |
452 HeapWord* const new_top = eden_space->top(); | |
453 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
454 absorb_size); | |
455 young_gen->reset_after_change(); | |
456 old_space->set_top(new_top); | |
457 old_space->set_end(new_top); | |
458 old_gen->reset_after_change(); | |
459 | |
460 // Update the object start array for the filler object and the data from eden. | |
461 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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462 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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463 start_array->allocate_block(p); |
0 | 464 } |
465 | |
466 // Could update the promoted average here, but it is not typically updated at | |
467 // full GCs and the value to use is unclear. Something like | |
468 // | |
469 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
470 | |
471 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
472 return true; | |
473 } | |
474 | |
475 void PSMarkSweep::allocate_stacks() { | |
476 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
477 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
478 | |
479 PSYoungGen* young_gen = heap->young_gen(); | |
480 | |
481 MutableSpace* to_space = young_gen->to_space(); | |
482 _preserved_marks = (PreservedMark*)to_space->top(); | |
483 _preserved_count = 0; | |
484 | |
485 // We want to calculate the size in bytes first. | |
486 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
487 // Now divide by the size of a PreservedMark | |
488 _preserved_count_max /= sizeof(PreservedMark); | |
489 } | |
490 | |
491 | |
492 void PSMarkSweep::deallocate_stacks() { | |
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493 _preserved_mark_stack.clear(true); |
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494 _preserved_oop_stack.clear(true); |
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495 _marking_stack.clear(); |
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496 _objarray_stack.clear(true); |
0 | 497 } |
498 | |
499 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
500 // Recursively traverse all live objects and mark them | |
501 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
502 trace(" 1"); | |
503 | |
504 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
505 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
506 | |
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507 // Need to clear claim bits before the tracing starts. |
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508 ClassLoaderDataGraph::clear_claimed_marks(); |
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509 |
0 | 510 // General strong roots. |
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511 { |
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512 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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513 Universe::oops_do(mark_and_push_closure()); |
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514 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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515 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
989
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516 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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517 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
989
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518 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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519 FlatProfiler::oops_do(mark_and_push_closure()); |
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520 Management::oops_do(mark_and_push_closure()); |
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521 JvmtiExport::oops_do(mark_and_push_closure()); |
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522 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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523 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
989
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524 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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525 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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526 } |
0 | 527 |
528 // Flush marking stack. | |
529 follow_stack(); | |
530 | |
531 // Process reference objects found during marking | |
532 { | |
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533 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 534 ref_processor()->process_discovered_references( |
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535 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
0 | 536 } |
537 | |
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538 // This is the point where the entire marking should have completed. |
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539 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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540 |
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541 // Unload classes and purge the SystemDictionary. |
0 | 542 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
543 | |
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544 // Unload nmethods. |
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545 CodeCache::do_unloading(is_alive_closure(), purged_class); |
0 | 546 |
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547 // Prune dead klasses from subklass/sibling/implementor lists. |
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548 Klass::clean_weak_klass_links(is_alive_closure()); |
941 | 549 |
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550 // Delete entries for dead interned strings. |
0 | 551 StringTable::unlink(is_alive_closure()); |
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552 |
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553 // Clean up unreferenced symbols in symbol table. |
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554 SymbolTable::unlink(); |
0 | 555 } |
556 | |
557 | |
558 void PSMarkSweep::mark_sweep_phase2() { | |
559 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
560 trace("2"); | |
561 | |
562 // Now all live objects are marked, compute the new object addresses. | |
563 | |
564 // It is not required that we traverse spaces in the same order in | |
565 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
566 // tracking expects us to do so. See comment under phase4. | |
567 | |
568 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
569 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
570 | |
571 PSOldGen* old_gen = heap->old_gen(); | |
572 | |
573 // Begin compacting into the old gen | |
574 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
575 | |
576 // This will also compact the young gen spaces. | |
577 old_gen->precompact(); | |
578 } | |
579 | |
580 // This should be moved to the shared markSweep code! | |
581 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
582 public: | |
583 bool do_object_b(oop p) { return true; } | |
584 }; | |
585 static PSAlwaysTrueClosure always_true; | |
586 | |
587 void PSMarkSweep::mark_sweep_phase3() { | |
588 // Adjust the pointers to reflect the new locations | |
589 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
590 trace("3"); | |
591 | |
592 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
593 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
594 | |
595 PSYoungGen* young_gen = heap->young_gen(); | |
596 PSOldGen* old_gen = heap->old_gen(); | |
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597 |
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598 // Need to clear claim bits before the tracing starts. |
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599 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 600 |
601 // General strong roots. | |
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602 Universe::oops_do(adjust_pointer_closure()); |
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603 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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604 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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605 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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606 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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607 FlatProfiler::oops_do(adjust_pointer_closure()); |
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608 Management::oops_do(adjust_pointer_closure()); |
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609 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 610 // SO_AllClasses |
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611 SystemDictionary::oops_do(adjust_pointer_closure()); |
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612 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 613 |
614 // Now adjust pointers in remaining weak roots. (All of which should | |
615 // have been cleared if they pointed to non-surviving objects.) | |
616 // Global (weak) JNI handles | |
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617 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 618 |
619 CodeCache::oops_do(adjust_pointer_closure()); | |
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620 StringTable::oops_do(adjust_pointer_closure()); |
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621 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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622 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 623 |
624 adjust_marks(); | |
625 | |
626 young_gen->adjust_pointers(); | |
627 old_gen->adjust_pointers(); | |
628 } | |
629 | |
630 void PSMarkSweep::mark_sweep_phase4() { | |
631 EventMark m("4 compact heap"); | |
632 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
633 trace("4"); | |
634 | |
635 // All pointers are now adjusted, move objects accordingly | |
636 | |
637 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
638 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
639 | |
640 PSYoungGen* young_gen = heap->young_gen(); | |
641 PSOldGen* old_gen = heap->old_gen(); | |
642 | |
643 old_gen->compact(); | |
644 young_gen->compact(); | |
645 } | |
646 | |
647 jlong PSMarkSweep::millis_since_last_gc() { | |
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648 // We need a monotonically non-deccreasing time in ms but |
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649 // os::javaTimeMillis() does not guarantee monotonicity. |
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650 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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651 jlong ret_val = now - _time_of_last_gc; |
0 | 652 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
653 if (ret_val < 0) { | |
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654 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 655 return 0; |
656 } | |
657 return ret_val; | |
658 } | |
659 | |
660 void PSMarkSweep::reset_millis_since_last_gc() { | |
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661 // We need a monotonically non-deccreasing time in ms but |
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662 // os::javaTimeMillis() does not guarantee monotonicity. |
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663 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 664 } |