Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10183:868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
Reviewed-by: mgerdin, coleenp
| author | jmasa |
|---|---|
| date | Tue, 12 Feb 2013 14:15:45 -0800 |
| parents | a08c80e9e1e5 |
| children | b06ac540229e |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "code/codeCache.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 31 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
| 32 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
| 33 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
| 34 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
| 35 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 36 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
| 37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
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38 #include "gc_implementation/shared/markSweep.hpp" |
| 1972 | 39 #include "gc_implementation/shared/spaceDecorator.hpp" |
| 40 #include "gc_interface/gcCause.hpp" | |
| 41 #include "memory/gcLocker.inline.hpp" | |
| 42 #include "memory/referencePolicy.hpp" | |
| 43 #include "memory/referenceProcessor.hpp" | |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "runtime/biasedLocking.hpp" | |
| 46 #include "runtime/fprofiler.hpp" | |
| 47 #include "runtime/safepoint.hpp" | |
| 48 #include "runtime/vmThread.hpp" | |
| 49 #include "services/management.hpp" | |
| 50 #include "services/memoryService.hpp" | |
| 51 #include "utilities/events.hpp" | |
| 52 #include "utilities/stack.inline.hpp" | |
| 0 | 53 |
| 54 elapsedTimer PSMarkSweep::_accumulated_time; | |
| 55 jlong PSMarkSweep::_time_of_last_gc = 0; | |
| 56 CollectorCounters* PSMarkSweep::_counters = NULL; | |
| 57 | |
| 58 void PSMarkSweep::initialize() { | |
| 59 MemRegion mr = Universe::heap()->reserved_region(); | |
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60 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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61 _counters = new CollectorCounters("PSMarkSweep", 1); |
| 0 | 62 } |
| 63 | |
| 64 // This method contains all heap specific policy for invoking mark sweep. | |
| 65 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
| 66 // the heap. It will do nothing further. If we need to bail out for policy | |
| 67 // reasons, scavenge before full gc, or any other specialized behavior, it | |
| 68 // needs to be added here. | |
| 69 // | |
| 70 // Note that this method should only be called from the vm_thread while | |
| 71 // at a safepoint! | |
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72 // |
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73 // Note that the all_soft_refs_clear flag in the collector policy |
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74 // may be true because this method can be called without intervening |
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75 // activity. For example when the heap space is tight and full measure |
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76 // are being taken to free space. |
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77 |
| 0 | 78 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
| 79 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 80 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 81 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 82 | |
| 83 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 84 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 85 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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86 IsGCActiveMark mark; |
| 0 | 87 |
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88 if (ScavengeBeforeFullGC) { |
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89 PSScavenge::invoke_no_policy(); |
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90 } |
| 0 | 91 |
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92 const bool clear_all_soft_refs = |
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93 heap->collector_policy()->should_clear_all_soft_refs(); |
| 0 | 94 |
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95 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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96 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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97 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
| 0 | 98 } |
| 99 | |
| 100 // This method contains no policy. You should probably | |
| 101 // be calling invoke() instead. | |
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102 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
| 0 | 103 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
| 104 assert(ref_processor() != NULL, "Sanity"); | |
| 105 | |
| 106 if (GC_locker::check_active_before_gc()) { | |
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107 return false; |
| 0 | 108 } |
| 109 | |
| 110 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 111 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 112 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 113 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
| 114 | |
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115 // The scope of casr should end after code that can change |
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116 // CollectorPolicy::_should_clear_all_soft_refs. |
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117 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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118 |
| 0 | 119 PSYoungGen* young_gen = heap->young_gen(); |
| 120 PSOldGen* old_gen = heap->old_gen(); | |
| 121 | |
| 122 // Increment the invocation count | |
| 123 heap->increment_total_collections(true /* full */); | |
| 124 | |
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125 // Save information needed to minimize mangling |
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126 heap->record_gen_tops_before_GC(); |
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127 |
| 0 | 128 // We need to track unique mark sweep invocations as well. |
| 129 _total_invocations++; | |
| 130 | |
| 131 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 132 | |
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133 heap->print_heap_before_gc(); |
| 0 | 134 |
| 135 // Fill in TLABs | |
| 136 heap->accumulate_statistics_all_tlabs(); | |
| 137 heap->ensure_parsability(true); // retire TLABs | |
| 138 | |
| 139 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 140 HandleMark hm; // Discard invalid handles created during verification | |
| 141 gclog_or_tty->print(" VerifyBeforeGC:"); | |
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142 Universe::verify(); |
| 0 | 143 } |
| 144 | |
| 145 // Verify object start arrays | |
| 146 if (VerifyObjectStartArray && | |
| 147 VerifyBeforeGC) { | |
| 148 old_gen->verify_object_start_array(); | |
| 149 } | |
| 150 | |
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151 heap->pre_full_gc_dump(); |
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152 |
| 0 | 153 // Filled in below to track the state of the young gen after the collection. |
| 154 bool eden_empty; | |
| 155 bool survivors_empty; | |
| 156 bool young_gen_empty; | |
| 157 | |
| 158 { | |
| 159 HandleMark hm; | |
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160 |
| 0 | 161 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 162 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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163 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
| 0 | 164 TraceCollectorStats tcs(counters()); |
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165 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
| 0 | 166 |
| 167 if (TraceGen1Time) accumulated_time()->start(); | |
| 168 | |
| 169 // Let the size policy know we're starting | |
| 170 size_policy->major_collection_begin(); | |
| 171 | |
| 172 CodeCache::gc_prologue(); | |
| 173 Threads::gc_prologue(); | |
| 174 BiasedLocking::preserve_marks(); | |
| 175 | |
| 176 // Capture heap size before collection for printing. | |
| 177 size_t prev_used = heap->used(); | |
| 178 | |
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179 // Capture metadata size before collection for sizing. |
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180 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
| 0 | 181 |
| 182 // For PrintGCDetails | |
| 183 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
| 184 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
| 185 | |
| 186 allocate_stacks(); | |
| 187 | |
| 188 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 189 | |
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190 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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191 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 192 |
| 193 mark_sweep_phase1(clear_all_softrefs); | |
| 194 | |
| 195 mark_sweep_phase2(); | |
| 196 | |
| 197 // Don't add any more derived pointers during phase3 | |
| 198 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 199 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 200 | |
| 201 mark_sweep_phase3(); | |
| 202 | |
| 203 mark_sweep_phase4(); | |
| 204 | |
| 205 restore_marks(); | |
| 206 | |
| 207 deallocate_stacks(); | |
| 208 | |
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209 if (ZapUnusedHeapArea) { |
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210 // Do a complete mangle (top to end) because the usage for |
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211 // scratch does not maintain a top pointer. |
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212 young_gen->to_space()->mangle_unused_area_complete(); |
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213 } |
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214 |
| 0 | 215 eden_empty = young_gen->eden_space()->is_empty(); |
| 216 if (!eden_empty) { | |
| 217 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
| 218 } | |
| 219 | |
| 220 // Update heap occupancy information which is used as | |
| 221 // input to soft ref clearing policy at the next gc. | |
| 222 Universe::update_heap_info_at_gc(); | |
| 223 | |
| 224 survivors_empty = young_gen->from_space()->is_empty() && | |
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225 young_gen->to_space()->is_empty(); |
| 0 | 226 young_gen_empty = eden_empty && survivors_empty; |
| 227 | |
| 228 BarrierSet* bs = heap->barrier_set(); | |
| 229 if (bs->is_a(BarrierSet::ModRef)) { | |
| 230 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
| 231 MemRegion old_mr = heap->old_gen()->reserved(); | |
| 232 if (young_gen_empty) { | |
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233 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 234 } else { |
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235 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 236 } |
| 237 } | |
| 238 | |
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239 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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240 ClassLoaderDataGraph::purge(); |
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241 MetaspaceAux::verify_metrics(); |
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242 |
| 0 | 243 BiasedLocking::restore_marks(); |
| 244 Threads::gc_epilogue(); | |
| 245 CodeCache::gc_epilogue(); | |
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246 JvmtiExport::gc_epilogue(); |
| 0 | 247 |
| 248 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 249 | |
| 250 ref_processor()->enqueue_discovered_references(NULL); | |
| 251 | |
| 252 // Update time of last GC | |
| 253 reset_millis_since_last_gc(); | |
| 254 | |
| 255 // Let the size policy know we're done | |
| 256 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
| 257 | |
| 258 if (UseAdaptiveSizePolicy) { | |
| 259 | |
| 260 if (PrintAdaptiveSizePolicy) { | |
| 261 gclog_or_tty->print("AdaptiveSizeStart: "); | |
| 262 gclog_or_tty->stamp(); | |
| 263 gclog_or_tty->print_cr(" collection: %d ", | |
| 264 heap->total_collections()); | |
| 265 if (Verbose) { | |
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266 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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267 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
| 0 | 268 } |
| 269 } | |
| 270 | |
| 271 // Don't check if the size_policy is ready here. Let | |
| 272 // the size_policy check that internally. | |
| 273 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
| 274 ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 275 UseAdaptiveSizePolicyWithSystemGC)) { | |
| 276 // Calculate optimal free space amounts | |
| 277 assert(young_gen->max_size() > | |
| 278 young_gen->from_space()->capacity_in_bytes() + | |
| 279 young_gen->to_space()->capacity_in_bytes(), | |
| 280 "Sizes of space in young gen are out-of-bounds"); | |
| 281 size_t max_eden_size = young_gen->max_size() - | |
| 282 young_gen->from_space()->capacity_in_bytes() - | |
| 283 young_gen->to_space()->capacity_in_bytes(); | |
| 284 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
| 285 young_gen->eden_space()->used_in_bytes(), | |
| 286 old_gen->used_in_bytes(), | |
| 287 young_gen->eden_space()->capacity_in_bytes(), | |
| 288 old_gen->max_gen_size(), | |
| 289 max_eden_size, | |
| 290 true /* full gc*/, | |
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291 gc_cause, |
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292 heap->collector_policy()); |
| 0 | 293 |
| 294 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
| 295 | |
| 296 // Don't resize the young generation at an major collection. A | |
| 297 // desired young generation size may have been calculated but | |
| 298 // resizing the young generation complicates the code because the | |
| 299 // resizing of the old generation may have moved the boundary | |
| 300 // between the young generation and the old generation. Let the | |
| 301 // young generation resizing happen at the minor collections. | |
| 302 } | |
| 303 if (PrintAdaptiveSizePolicy) { | |
| 304 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 305 heap->total_collections()); | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 if (UsePerfData) { | |
| 310 heap->gc_policy_counters()->update_counters(); | |
| 311 heap->gc_policy_counters()->update_old_capacity( | |
| 312 old_gen->capacity_in_bytes()); | |
| 313 heap->gc_policy_counters()->update_young_capacity( | |
| 314 young_gen->capacity_in_bytes()); | |
| 315 } | |
| 316 | |
| 317 heap->resize_all_tlabs(); | |
| 318 | |
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319 // We collected the heap, recalculate the metaspace capacity |
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320 MetaspaceGC::compute_new_size(); |
| 0 | 321 |
| 322 if (TraceGen1Time) accumulated_time()->stop(); | |
| 323 | |
| 324 if (PrintGC) { | |
| 325 if (PrintGCDetails) { | |
| 326 // Don't print a GC timestamp here. This is after the GC so | |
| 327 // would be confusing. | |
| 328 young_gen->print_used_change(young_gen_prev_used); | |
| 329 old_gen->print_used_change(old_gen_prev_used); | |
| 330 } | |
| 331 heap->print_heap_change(prev_used); | |
| 332 if (PrintGCDetails) { | |
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333 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 334 } |
| 335 } | |
| 336 | |
| 337 // Track memory usage and detect low memory | |
| 338 MemoryService::track_memory_usage(); | |
| 339 heap->update_counters(); | |
| 340 } | |
| 341 | |
| 342 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 343 HandleMark hm; // Discard invalid handles created during verification | |
| 344 gclog_or_tty->print(" VerifyAfterGC:"); | |
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345 Universe::verify(); |
| 0 | 346 } |
| 347 | |
| 348 // Re-verify object start arrays | |
| 349 if (VerifyObjectStartArray && | |
| 350 VerifyAfterGC) { | |
| 351 old_gen->verify_object_start_array(); | |
| 352 } | |
| 353 | |
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354 if (ZapUnusedHeapArea) { |
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355 old_gen->object_space()->check_mangled_unused_area_complete(); |
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356 } |
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357 |
| 0 | 358 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
| 359 | |
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360 heap->print_heap_after_gc(); |
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361 |
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362 heap->post_full_gc_dump(); |
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363 |
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364 #ifdef TRACESPINNING |
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365 ParallelTaskTerminator::print_termination_counts(); |
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366 #endif |
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367 |
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368 return true; |
| 0 | 369 } |
| 370 | |
| 371 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 372 PSYoungGen* young_gen, | |
| 373 PSOldGen* old_gen) { | |
| 374 MutableSpace* const eden_space = young_gen->eden_space(); | |
| 375 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
| 376 assert(young_gen->virtual_space()->alignment() == | |
| 377 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
| 378 | |
| 379 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
| 380 return false; | |
| 381 } | |
| 382 | |
| 383 // Both generations must be completely committed. | |
| 384 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
| 385 return false; | |
| 386 } | |
| 387 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
| 388 return false; | |
| 389 } | |
| 390 | |
| 391 // Figure out how much to take from eden. Include the average amount promoted | |
| 392 // in the total; otherwise the next young gen GC will simply bail out to a | |
| 393 // full GC. | |
| 394 const size_t alignment = old_gen->virtual_space()->alignment(); | |
| 395 const size_t eden_used = eden_space->used_in_bytes(); | |
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396 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
| 0 | 397 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
| 398 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
| 399 | |
| 400 if (absorb_size >= eden_capacity) { | |
| 401 return false; // Must leave some space in eden. | |
| 402 } | |
| 403 | |
| 404 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
| 405 if (new_young_size < young_gen->min_gen_size()) { | |
| 406 return false; // Respect young gen minimum size. | |
| 407 } | |
| 408 | |
| 409 if (TraceAdaptiveGCBoundary && Verbose) { | |
| 410 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
| 411 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
| 412 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
| 413 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
| 414 absorb_size / K, | |
| 415 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
| 416 young_gen->from_space()->used_in_bytes() / K, | |
| 417 young_gen->to_space()->used_in_bytes() / K, | |
| 418 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
| 419 } | |
| 420 | |
| 421 // Fill the unused part of the old gen. | |
| 422 MutableSpace* const old_space = old_gen->object_space(); | |
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423 HeapWord* const unused_start = old_space->top(); |
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424 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
| 0 | 425 |
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426 if (unused_words > 0) { |
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427 if (unused_words < CollectedHeap::min_fill_size()) { |
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428 return false; // If the old gen cannot be filled, must give up. |
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429 } |
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430 CollectedHeap::fill_with_objects(unused_start, unused_words); |
| 0 | 431 } |
| 432 | |
| 433 // Take the live data from eden and set both top and end in the old gen to | |
| 434 // eden top. (Need to set end because reset_after_change() mangles the region | |
| 435 // from end to virtual_space->high() in debug builds). | |
| 436 HeapWord* const new_top = eden_space->top(); | |
| 437 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
| 438 absorb_size); | |
| 439 young_gen->reset_after_change(); | |
| 440 old_space->set_top(new_top); | |
| 441 old_space->set_end(new_top); | |
| 442 old_gen->reset_after_change(); | |
| 443 | |
| 444 // Update the object start array for the filler object and the data from eden. | |
| 445 ObjectStartArray* const start_array = old_gen->start_array(); | |
|
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446 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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447 start_array->allocate_block(p); |
| 0 | 448 } |
| 449 | |
| 450 // Could update the promoted average here, but it is not typically updated at | |
| 451 // full GCs and the value to use is unclear. Something like | |
| 452 // | |
| 453 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
| 454 | |
| 455 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
| 456 return true; | |
| 457 } | |
| 458 | |
| 459 void PSMarkSweep::allocate_stacks() { | |
| 460 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 461 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 462 | |
| 463 PSYoungGen* young_gen = heap->young_gen(); | |
| 464 | |
| 465 MutableSpace* to_space = young_gen->to_space(); | |
| 466 _preserved_marks = (PreservedMark*)to_space->top(); | |
| 467 _preserved_count = 0; | |
| 468 | |
| 469 // We want to calculate the size in bytes first. | |
| 470 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
| 471 // Now divide by the size of a PreservedMark | |
| 472 _preserved_count_max /= sizeof(PreservedMark); | |
| 473 } | |
| 474 | |
| 475 | |
| 476 void PSMarkSweep::deallocate_stacks() { | |
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477 _preserved_mark_stack.clear(true); |
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478 _preserved_oop_stack.clear(true); |
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479 _marking_stack.clear(); |
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480 _objarray_stack.clear(true); |
| 0 | 481 } |
| 482 | |
| 483 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
| 484 // Recursively traverse all live objects and mark them | |
| 485 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 486 trace(" 1"); | |
| 487 | |
| 488 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 489 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 490 | |
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491 // Need to clear claim bits before the tracing starts. |
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492 ClassLoaderDataGraph::clear_claimed_marks(); |
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493 |
| 0 | 494 // General strong roots. |
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495 { |
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496 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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497 Universe::oops_do(mark_and_push_closure()); |
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498 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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499 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
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500 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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501 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
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502 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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503 FlatProfiler::oops_do(mark_and_push_closure()); |
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504 Management::oops_do(mark_and_push_closure()); |
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505 JvmtiExport::oops_do(mark_and_push_closure()); |
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506 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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507 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
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508 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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509 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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510 } |
| 0 | 511 |
| 512 // Flush marking stack. | |
| 513 follow_stack(); | |
| 514 | |
| 515 // Process reference objects found during marking | |
| 516 { | |
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517 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 518 ref_processor()->process_discovered_references( |
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519 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
| 0 | 520 } |
| 521 | |
| 522 // Follow system dictionary roots and unload classes | |
| 523 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
| 524 | |
| 525 // Follow code cache roots | |
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526 CodeCache::do_unloading(is_alive_closure(), purged_class); |
| 0 | 527 follow_stack(); // Flush marking stack |
| 528 | |
| 529 // Update subklass/sibling/implementor links of live klasses | |
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530 Klass::clean_weak_klass_links(&is_alive); |
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531 assert(_marking_stack.is_empty(), "just drained"); |
| 941 | 532 |
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533 // Visit interned string tables and delete unmarked oops |
| 0 | 534 StringTable::unlink(is_alive_closure()); |
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535 // Clean up unreferenced symbols in symbol table. |
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536 SymbolTable::unlink(); |
| 0 | 537 |
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538 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
| 0 | 539 } |
| 540 | |
| 541 | |
| 542 void PSMarkSweep::mark_sweep_phase2() { | |
| 543 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 544 trace("2"); | |
| 545 | |
| 546 // Now all live objects are marked, compute the new object addresses. | |
| 547 | |
| 548 // It is not required that we traverse spaces in the same order in | |
| 549 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 550 // tracking expects us to do so. See comment under phase4. | |
| 551 | |
| 552 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 553 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 554 | |
| 555 PSOldGen* old_gen = heap->old_gen(); | |
| 556 | |
| 557 // Begin compacting into the old gen | |
| 558 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
| 559 | |
| 560 // This will also compact the young gen spaces. | |
| 561 old_gen->precompact(); | |
| 562 } | |
| 563 | |
| 564 // This should be moved to the shared markSweep code! | |
| 565 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
| 566 public: | |
| 567 void do_object(oop p) { ShouldNotReachHere(); } | |
| 568 bool do_object_b(oop p) { return true; } | |
| 569 }; | |
| 570 static PSAlwaysTrueClosure always_true; | |
| 571 | |
| 572 void PSMarkSweep::mark_sweep_phase3() { | |
| 573 // Adjust the pointers to reflect the new locations | |
| 574 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 575 trace("3"); | |
| 576 | |
| 577 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 578 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 579 | |
| 580 PSYoungGen* young_gen = heap->young_gen(); | |
| 581 PSOldGen* old_gen = heap->old_gen(); | |
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582 |
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583 // Need to clear claim bits before the tracing starts. |
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584 ClassLoaderDataGraph::clear_claimed_marks(); |
| 0 | 585 |
| 586 // General strong roots. | |
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587 Universe::oops_do(adjust_pointer_closure()); |
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588 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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589 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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590 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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591 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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592 FlatProfiler::oops_do(adjust_pointer_closure()); |
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593 Management::oops_do(adjust_pointer_closure()); |
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594 JvmtiExport::oops_do(adjust_pointer_closure()); |
| 0 | 595 // SO_AllClasses |
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596 SystemDictionary::oops_do(adjust_pointer_closure()); |
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597 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
| 0 | 598 |
| 599 // Now adjust pointers in remaining weak roots. (All of which should | |
| 600 // have been cleared if they pointed to non-surviving objects.) | |
| 601 // Global (weak) JNI handles | |
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602 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
| 0 | 603 |
| 604 CodeCache::oops_do(adjust_pointer_closure()); | |
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605 StringTable::oops_do(adjust_pointer_closure()); |
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606 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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607 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
| 0 | 608 |
| 609 adjust_marks(); | |
| 610 | |
| 611 young_gen->adjust_pointers(); | |
| 612 old_gen->adjust_pointers(); | |
| 613 } | |
| 614 | |
| 615 void PSMarkSweep::mark_sweep_phase4() { | |
| 616 EventMark m("4 compact heap"); | |
| 617 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 618 trace("4"); | |
| 619 | |
| 620 // All pointers are now adjusted, move objects accordingly | |
| 621 | |
| 622 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 623 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 624 | |
| 625 PSYoungGen* young_gen = heap->young_gen(); | |
| 626 PSOldGen* old_gen = heap->old_gen(); | |
| 627 | |
| 628 old_gen->compact(); | |
| 629 young_gen->compact(); | |
| 630 } | |
| 631 | |
| 632 jlong PSMarkSweep::millis_since_last_gc() { | |
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633 // We need a monotonically non-deccreasing time in ms but |
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634 // os::javaTimeMillis() does not guarantee monotonicity. |
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635 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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636 jlong ret_val = now - _time_of_last_gc; |
| 0 | 637 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
| 638 if (ret_val < 0) { | |
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639 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
| 0 | 640 return 0; |
| 641 } | |
| 642 return ret_val; | |
| 643 } | |
| 644 | |
| 645 void PSMarkSweep::reset_millis_since_last_gc() { | |
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646 // We need a monotonically non-deccreasing time in ms but |
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647 // os::javaTimeMillis() does not guarantee monotonicity. |
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648 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 649 } |