Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 17866:270d7cb38f40
8038934: Remove prefix allocated_ from methods and variables in Metaspace
Reviewed-by: jmasa, coleenp
| author | ehelin |
|---|---|
| date | Mon, 31 Mar 2014 17:09:38 +0200 |
| parents | 86e6d691f2e1 |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "code/codeCache.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
| 31 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
| 32 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
| 33 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
| 34 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 35 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
| 10405 | 36 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 37 #include "gc_implementation/shared/gcTimer.hpp" | |
| 38 #include "gc_implementation/shared/gcTrace.hpp" | |
| 39 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 1972 | 40 #include "gc_implementation/shared/isGCActiveMark.hpp" |
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41 #include "gc_implementation/shared/markSweep.hpp" |
| 1972 | 42 #include "gc_implementation/shared/spaceDecorator.hpp" |
| 43 #include "gc_interface/gcCause.hpp" | |
| 44 #include "memory/gcLocker.inline.hpp" | |
| 45 #include "memory/referencePolicy.hpp" | |
| 46 #include "memory/referenceProcessor.hpp" | |
| 47 #include "oops/oop.inline.hpp" | |
| 48 #include "runtime/biasedLocking.hpp" | |
| 49 #include "runtime/fprofiler.hpp" | |
| 50 #include "runtime/safepoint.hpp" | |
| 51 #include "runtime/vmThread.hpp" | |
| 52 #include "services/management.hpp" | |
| 53 #include "services/memoryService.hpp" | |
| 54 #include "utilities/events.hpp" | |
| 55 #include "utilities/stack.inline.hpp" | |
| 0 | 56 |
| 57 elapsedTimer PSMarkSweep::_accumulated_time; | |
| 58 jlong PSMarkSweep::_time_of_last_gc = 0; | |
| 59 CollectorCounters* PSMarkSweep::_counters = NULL; | |
| 60 | |
| 61 void PSMarkSweep::initialize() { | |
| 62 MemRegion mr = Universe::heap()->reserved_region(); | |
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63 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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64 _counters = new CollectorCounters("PSMarkSweep", 1); |
| 0 | 65 } |
| 66 | |
| 67 // This method contains all heap specific policy for invoking mark sweep. | |
| 68 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
| 69 // the heap. It will do nothing further. If we need to bail out for policy | |
| 70 // reasons, scavenge before full gc, or any other specialized behavior, it | |
| 71 // needs to be added here. | |
| 72 // | |
| 73 // Note that this method should only be called from the vm_thread while | |
| 74 // at a safepoint! | |
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75 // |
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76 // Note that the all_soft_refs_clear flag in the collector policy |
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77 // may be true because this method can be called without intervening |
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78 // activity. For example when the heap space is tight and full measure |
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79 // are being taken to free space. |
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80 |
| 0 | 81 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
| 82 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 83 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 84 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 85 | |
| 86 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 87 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 88 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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89 IsGCActiveMark mark; |
| 0 | 90 |
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91 if (ScavengeBeforeFullGC) { |
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92 PSScavenge::invoke_no_policy(); |
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93 } |
| 0 | 94 |
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95 const bool clear_all_soft_refs = |
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96 heap->collector_policy()->should_clear_all_soft_refs(); |
| 0 | 97 |
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98 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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99 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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100 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
| 0 | 101 } |
| 102 | |
| 103 // This method contains no policy. You should probably | |
| 104 // be calling invoke() instead. | |
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105 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
| 0 | 106 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
| 107 assert(ref_processor() != NULL, "Sanity"); | |
| 108 | |
| 109 if (GC_locker::check_active_before_gc()) { | |
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110 return false; |
| 0 | 111 } |
| 112 | |
| 113 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 10405 | 114 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
| 0 | 115 GCCause::Cause gc_cause = heap->gc_cause(); |
| 10405 | 116 |
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117 _gc_timer->register_gc_start(); |
| 10405 | 118 _gc_tracer->report_gc_start(gc_cause, _gc_timer->gc_start()); |
| 119 | |
| 0 | 120 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); |
| 121 | |
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122 // The scope of casr should end after code that can change |
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123 // CollectorPolicy::_should_clear_all_soft_refs. |
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124 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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125 |
| 0 | 126 PSYoungGen* young_gen = heap->young_gen(); |
| 127 PSOldGen* old_gen = heap->old_gen(); | |
| 128 | |
| 129 // Increment the invocation count | |
| 130 heap->increment_total_collections(true /* full */); | |
| 131 | |
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132 // Save information needed to minimize mangling |
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133 heap->record_gen_tops_before_GC(); |
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134 |
| 0 | 135 // We need to track unique mark sweep invocations as well. |
| 136 _total_invocations++; | |
| 137 | |
| 138 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 139 | |
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140 heap->print_heap_before_gc(); |
| 10405 | 141 heap->trace_heap_before_gc(_gc_tracer); |
| 0 | 142 |
| 143 // Fill in TLABs | |
| 144 heap->accumulate_statistics_all_tlabs(); | |
| 145 heap->ensure_parsability(true); // retire TLABs | |
| 146 | |
| 147 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 148 HandleMark hm; // Discard invalid handles created during verification | |
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149 Universe::verify(" VerifyBeforeGC:"); |
| 0 | 150 } |
| 151 | |
| 152 // Verify object start arrays | |
| 153 if (VerifyObjectStartArray && | |
| 154 VerifyBeforeGC) { | |
| 155 old_gen->verify_object_start_array(); | |
| 156 } | |
| 157 | |
| 10405 | 158 heap->pre_full_gc_dump(_gc_timer); |
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159 |
| 0 | 160 // Filled in below to track the state of the young gen after the collection. |
| 161 bool eden_empty; | |
| 162 bool survivors_empty; | |
| 163 bool young_gen_empty; | |
| 164 | |
| 165 { | |
| 166 HandleMark hm; | |
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167 |
| 0 | 168 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 169 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 10405 | 170 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
| 0 | 171 TraceCollectorStats tcs(counters()); |
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172 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
| 0 | 173 |
| 174 if (TraceGen1Time) accumulated_time()->start(); | |
| 175 | |
| 176 // Let the size policy know we're starting | |
| 177 size_policy->major_collection_begin(); | |
| 178 | |
| 179 CodeCache::gc_prologue(); | |
| 180 Threads::gc_prologue(); | |
| 181 BiasedLocking::preserve_marks(); | |
| 182 | |
| 183 // Capture heap size before collection for printing. | |
| 184 size_t prev_used = heap->used(); | |
| 185 | |
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186 // Capture metadata size before collection for sizing. |
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187 size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
| 0 | 188 |
| 189 // For PrintGCDetails | |
| 190 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
| 191 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
| 192 | |
| 193 allocate_stacks(); | |
| 194 | |
| 195 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 196 | |
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197 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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198 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 199 |
| 200 mark_sweep_phase1(clear_all_softrefs); | |
| 201 | |
| 202 mark_sweep_phase2(); | |
| 203 | |
| 204 // Don't add any more derived pointers during phase3 | |
| 205 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 206 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 207 | |
| 208 mark_sweep_phase3(); | |
| 209 | |
| 210 mark_sweep_phase4(); | |
| 211 | |
| 212 restore_marks(); | |
| 213 | |
| 214 deallocate_stacks(); | |
| 215 | |
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216 if (ZapUnusedHeapArea) { |
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217 // Do a complete mangle (top to end) because the usage for |
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218 // scratch does not maintain a top pointer. |
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219 young_gen->to_space()->mangle_unused_area_complete(); |
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220 } |
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221 |
| 0 | 222 eden_empty = young_gen->eden_space()->is_empty(); |
| 223 if (!eden_empty) { | |
| 224 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
| 225 } | |
| 226 | |
| 227 // Update heap occupancy information which is used as | |
| 228 // input to soft ref clearing policy at the next gc. | |
| 229 Universe::update_heap_info_at_gc(); | |
| 230 | |
| 231 survivors_empty = young_gen->from_space()->is_empty() && | |
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232 young_gen->to_space()->is_empty(); |
| 0 | 233 young_gen_empty = eden_empty && survivors_empty; |
| 234 | |
| 235 BarrierSet* bs = heap->barrier_set(); | |
| 236 if (bs->is_a(BarrierSet::ModRef)) { | |
| 237 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
| 238 MemRegion old_mr = heap->old_gen()->reserved(); | |
| 239 if (young_gen_empty) { | |
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240 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 241 } else { |
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242 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 243 } |
| 244 } | |
| 245 | |
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246 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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247 ClassLoaderDataGraph::purge(); |
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248 MetaspaceAux::verify_metrics(); |
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249 |
| 0 | 250 BiasedLocking::restore_marks(); |
| 251 Threads::gc_epilogue(); | |
| 252 CodeCache::gc_epilogue(); | |
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253 JvmtiExport::gc_epilogue(); |
| 0 | 254 |
| 255 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 256 | |
| 257 ref_processor()->enqueue_discovered_references(NULL); | |
| 258 | |
| 259 // Update time of last GC | |
| 260 reset_millis_since_last_gc(); | |
| 261 | |
| 262 // Let the size policy know we're done | |
| 263 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
| 264 | |
| 265 if (UseAdaptiveSizePolicy) { | |
| 266 | |
| 267 if (PrintAdaptiveSizePolicy) { | |
| 268 gclog_or_tty->print("AdaptiveSizeStart: "); | |
| 269 gclog_or_tty->stamp(); | |
| 270 gclog_or_tty->print_cr(" collection: %d ", | |
| 271 heap->total_collections()); | |
| 272 if (Verbose) { | |
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273 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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274 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
| 0 | 275 } |
| 276 } | |
| 277 | |
| 278 // Don't check if the size_policy is ready here. Let | |
| 279 // the size_policy check that internally. | |
| 280 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
| 281 ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 282 UseAdaptiveSizePolicyWithSystemGC)) { | |
| 283 // Calculate optimal free space amounts | |
| 284 assert(young_gen->max_size() > | |
| 285 young_gen->from_space()->capacity_in_bytes() + | |
| 286 young_gen->to_space()->capacity_in_bytes(), | |
| 287 "Sizes of space in young gen are out-of-bounds"); | |
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288 |
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289 size_t young_live = young_gen->used_in_bytes(); |
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290 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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291 size_t old_live = old_gen->used_in_bytes(); |
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292 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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293 size_t max_old_gen_size = old_gen->max_gen_size(); |
| 0 | 294 size_t max_eden_size = young_gen->max_size() - |
| 295 young_gen->from_space()->capacity_in_bytes() - | |
| 296 young_gen->to_space()->capacity_in_bytes(); | |
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297 |
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298 // Used for diagnostics |
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299 size_policy->clear_generation_free_space_flags(); |
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300 |
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301 size_policy->compute_generations_free_space(young_live, |
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302 eden_live, |
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303 old_live, |
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304 cur_eden, |
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305 max_old_gen_size, |
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306 max_eden_size, |
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307 true /* full gc*/); |
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308 |
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309 size_policy->check_gc_overhead_limit(young_live, |
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310 eden_live, |
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311 max_old_gen_size, |
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312 max_eden_size, |
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313 true /* full gc*/, |
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314 gc_cause, |
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315 heap->collector_policy()); |
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316 |
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317 size_policy->decay_supplemental_growth(true /* full gc*/); |
| 0 | 318 |
| 319 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
| 320 | |
| 321 // Don't resize the young generation at an major collection. A | |
| 322 // desired young generation size may have been calculated but | |
| 323 // resizing the young generation complicates the code because the | |
| 324 // resizing of the old generation may have moved the boundary | |
| 325 // between the young generation and the old generation. Let the | |
| 326 // young generation resizing happen at the minor collections. | |
| 327 } | |
| 328 if (PrintAdaptiveSizePolicy) { | |
| 329 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 330 heap->total_collections()); | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 if (UsePerfData) { | |
| 335 heap->gc_policy_counters()->update_counters(); | |
| 336 heap->gc_policy_counters()->update_old_capacity( | |
| 337 old_gen->capacity_in_bytes()); | |
| 338 heap->gc_policy_counters()->update_young_capacity( | |
| 339 young_gen->capacity_in_bytes()); | |
| 340 } | |
| 341 | |
| 342 heap->resize_all_tlabs(); | |
| 343 | |
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344 // We collected the heap, recalculate the metaspace capacity |
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345 MetaspaceGC::compute_new_size(); |
| 0 | 346 |
| 347 if (TraceGen1Time) accumulated_time()->stop(); | |
| 348 | |
| 349 if (PrintGC) { | |
| 350 if (PrintGCDetails) { | |
| 351 // Don't print a GC timestamp here. This is after the GC so | |
| 352 // would be confusing. | |
| 353 young_gen->print_used_change(young_gen_prev_used); | |
| 354 old_gen->print_used_change(old_gen_prev_used); | |
| 355 } | |
| 356 heap->print_heap_change(prev_used); | |
| 357 if (PrintGCDetails) { | |
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358 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 359 } |
| 360 } | |
| 361 | |
| 362 // Track memory usage and detect low memory | |
| 363 MemoryService::track_memory_usage(); | |
| 364 heap->update_counters(); | |
| 365 } | |
| 366 | |
| 367 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 368 HandleMark hm; // Discard invalid handles created during verification | |
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369 Universe::verify(" VerifyAfterGC:"); |
| 0 | 370 } |
| 371 | |
| 372 // Re-verify object start arrays | |
| 373 if (VerifyObjectStartArray && | |
| 374 VerifyAfterGC) { | |
| 375 old_gen->verify_object_start_array(); | |
| 376 } | |
| 377 | |
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378 if (ZapUnusedHeapArea) { |
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379 old_gen->object_space()->check_mangled_unused_area_complete(); |
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380 } |
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381 |
| 0 | 382 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
| 383 | |
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384 heap->print_heap_after_gc(); |
| 10405 | 385 heap->trace_heap_after_gc(_gc_tracer); |
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386 |
| 10405 | 387 heap->post_full_gc_dump(_gc_timer); |
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388 |
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389 #ifdef TRACESPINNING |
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390 ParallelTaskTerminator::print_termination_counts(); |
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391 #endif |
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392 |
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393 _gc_timer->register_gc_end(); |
| 10405 | 394 |
| 395 _gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
| 396 | |
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397 return true; |
| 0 | 398 } |
| 399 | |
| 400 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 401 PSYoungGen* young_gen, | |
| 402 PSOldGen* old_gen) { | |
| 403 MutableSpace* const eden_space = young_gen->eden_space(); | |
| 404 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
| 405 assert(young_gen->virtual_space()->alignment() == | |
| 406 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
| 407 | |
| 408 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
| 409 return false; | |
| 410 } | |
| 411 | |
| 412 // Both generations must be completely committed. | |
| 413 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
| 414 return false; | |
| 415 } | |
| 416 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
| 417 return false; | |
| 418 } | |
| 419 | |
| 420 // Figure out how much to take from eden. Include the average amount promoted | |
| 421 // in the total; otherwise the next young gen GC will simply bail out to a | |
| 422 // full GC. | |
| 423 const size_t alignment = old_gen->virtual_space()->alignment(); | |
| 424 const size_t eden_used = eden_space->used_in_bytes(); | |
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425 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
| 0 | 426 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
| 427 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
| 428 | |
| 429 if (absorb_size >= eden_capacity) { | |
| 430 return false; // Must leave some space in eden. | |
| 431 } | |
| 432 | |
| 433 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
| 434 if (new_young_size < young_gen->min_gen_size()) { | |
| 435 return false; // Respect young gen minimum size. | |
| 436 } | |
| 437 | |
| 438 if (TraceAdaptiveGCBoundary && Verbose) { | |
| 439 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
| 440 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
| 441 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
| 442 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
| 443 absorb_size / K, | |
| 444 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
| 445 young_gen->from_space()->used_in_bytes() / K, | |
| 446 young_gen->to_space()->used_in_bytes() / K, | |
| 447 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
| 448 } | |
| 449 | |
| 450 // Fill the unused part of the old gen. | |
| 451 MutableSpace* const old_space = old_gen->object_space(); | |
|
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452 HeapWord* const unused_start = old_space->top(); |
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453 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
| 0 | 454 |
|
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455 if (unused_words > 0) { |
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456 if (unused_words < CollectedHeap::min_fill_size()) { |
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457 return false; // If the old gen cannot be filled, must give up. |
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458 } |
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459 CollectedHeap::fill_with_objects(unused_start, unused_words); |
| 0 | 460 } |
| 461 | |
| 462 // Take the live data from eden and set both top and end in the old gen to | |
| 463 // eden top. (Need to set end because reset_after_change() mangles the region | |
| 464 // from end to virtual_space->high() in debug builds). | |
| 465 HeapWord* const new_top = eden_space->top(); | |
| 466 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
| 467 absorb_size); | |
| 468 young_gen->reset_after_change(); | |
| 469 old_space->set_top(new_top); | |
| 470 old_space->set_end(new_top); | |
| 471 old_gen->reset_after_change(); | |
| 472 | |
| 473 // Update the object start array for the filler object and the data from eden. | |
| 474 ObjectStartArray* const start_array = old_gen->start_array(); | |
|
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475 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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476 start_array->allocate_block(p); |
| 0 | 477 } |
| 478 | |
| 479 // Could update the promoted average here, but it is not typically updated at | |
| 480 // full GCs and the value to use is unclear. Something like | |
| 481 // | |
| 482 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
| 483 | |
| 484 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
| 485 return true; | |
| 486 } | |
| 487 | |
| 488 void PSMarkSweep::allocate_stacks() { | |
| 489 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 490 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 491 | |
| 492 PSYoungGen* young_gen = heap->young_gen(); | |
| 493 | |
| 494 MutableSpace* to_space = young_gen->to_space(); | |
| 495 _preserved_marks = (PreservedMark*)to_space->top(); | |
| 496 _preserved_count = 0; | |
| 497 | |
| 498 // We want to calculate the size in bytes first. | |
| 499 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
| 500 // Now divide by the size of a PreservedMark | |
| 501 _preserved_count_max /= sizeof(PreservedMark); | |
| 502 } | |
| 503 | |
| 504 | |
| 505 void PSMarkSweep::deallocate_stacks() { | |
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506 _preserved_mark_stack.clear(true); |
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507 _preserved_oop_stack.clear(true); |
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508 _marking_stack.clear(); |
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509 _objarray_stack.clear(true); |
| 0 | 510 } |
| 511 | |
| 512 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
| 513 // Recursively traverse all live objects and mark them | |
| 10405 | 514 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 515 trace(" 1"); |
| 516 | |
| 517 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 518 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 519 | |
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520 // Need to clear claim bits before the tracing starts. |
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521 ClassLoaderDataGraph::clear_claimed_marks(); |
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522 |
| 0 | 523 // General strong roots. |
|
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524 { |
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525 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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526 Universe::oops_do(mark_and_push_closure()); |
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527 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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528 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
|
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529 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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530 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
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531 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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532 FlatProfiler::oops_do(mark_and_push_closure()); |
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533 Management::oops_do(mark_and_push_closure()); |
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534 JvmtiExport::oops_do(mark_and_push_closure()); |
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535 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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536 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
|
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537 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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538 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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539 } |
| 0 | 540 |
| 541 // Flush marking stack. | |
| 542 follow_stack(); | |
| 543 | |
| 544 // Process reference objects found during marking | |
| 545 { | |
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546 ref_processor()->setup_policy(clear_all_softrefs); |
| 10405 | 547 const ReferenceProcessorStats& stats = |
| 548 ref_processor()->process_discovered_references( | |
| 549 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer); | |
| 550 gc_tracer()->report_gc_reference_stats(stats); | |
| 0 | 551 } |
| 552 | |
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553 // This is the point where the entire marking should have completed. |
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554 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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555 |
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556 // Unload classes and purge the SystemDictionary. |
| 0 | 557 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
| 558 | |
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559 // Unload nmethods. |
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560 CodeCache::do_unloading(is_alive_closure(), purged_class); |
| 0 | 561 |
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562 // Prune dead klasses from subklass/sibling/implementor lists. |
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563 Klass::clean_weak_klass_links(is_alive_closure()); |
| 941 | 564 |
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565 // Delete entries for dead interned strings. |
| 0 | 566 StringTable::unlink(is_alive_closure()); |
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567 |
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568 // Clean up unreferenced symbols in symbol table. |
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569 SymbolTable::unlink(); |
| 10405 | 570 _gc_tracer->report_object_count_after_gc(is_alive_closure()); |
| 0 | 571 } |
| 572 | |
| 573 | |
| 574 void PSMarkSweep::mark_sweep_phase2() { | |
| 10405 | 575 GCTraceTime tm("phase 2", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 576 trace("2"); |
| 577 | |
| 578 // Now all live objects are marked, compute the new object addresses. | |
| 579 | |
| 580 // It is not required that we traverse spaces in the same order in | |
| 581 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 582 // tracking expects us to do so. See comment under phase4. | |
| 583 | |
| 584 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 585 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 586 | |
| 587 PSOldGen* old_gen = heap->old_gen(); | |
| 588 | |
| 589 // Begin compacting into the old gen | |
| 590 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
| 591 | |
| 592 // This will also compact the young gen spaces. | |
| 593 old_gen->precompact(); | |
| 594 } | |
| 595 | |
| 596 // This should be moved to the shared markSweep code! | |
| 597 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
| 598 public: | |
| 599 bool do_object_b(oop p) { return true; } | |
| 600 }; | |
| 601 static PSAlwaysTrueClosure always_true; | |
| 602 | |
| 603 void PSMarkSweep::mark_sweep_phase3() { | |
| 604 // Adjust the pointers to reflect the new locations | |
| 10405 | 605 GCTraceTime tm("phase 3", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 606 trace("3"); |
| 607 | |
| 608 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 609 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 610 | |
| 611 PSYoungGen* young_gen = heap->young_gen(); | |
| 612 PSOldGen* old_gen = heap->old_gen(); | |
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613 |
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614 // Need to clear claim bits before the tracing starts. |
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615 ClassLoaderDataGraph::clear_claimed_marks(); |
| 0 | 616 |
| 617 // General strong roots. | |
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618 Universe::oops_do(adjust_pointer_closure()); |
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619 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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620 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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621 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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622 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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623 FlatProfiler::oops_do(adjust_pointer_closure()); |
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624 Management::oops_do(adjust_pointer_closure()); |
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625 JvmtiExport::oops_do(adjust_pointer_closure()); |
| 0 | 626 // SO_AllClasses |
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627 SystemDictionary::oops_do(adjust_pointer_closure()); |
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628 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
| 0 | 629 |
| 630 // Now adjust pointers in remaining weak roots. (All of which should | |
| 631 // have been cleared if they pointed to non-surviving objects.) | |
| 632 // Global (weak) JNI handles | |
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633 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
| 0 | 634 |
| 635 CodeCache::oops_do(adjust_pointer_closure()); | |
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636 StringTable::oops_do(adjust_pointer_closure()); |
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637 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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638 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
| 0 | 639 |
| 640 adjust_marks(); | |
| 641 | |
| 642 young_gen->adjust_pointers(); | |
| 643 old_gen->adjust_pointers(); | |
| 644 } | |
| 645 | |
| 646 void PSMarkSweep::mark_sweep_phase4() { | |
| 647 EventMark m("4 compact heap"); | |
| 10405 | 648 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 649 trace("4"); |
| 650 | |
| 651 // All pointers are now adjusted, move objects accordingly | |
| 652 | |
| 653 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 654 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 655 | |
| 656 PSYoungGen* young_gen = heap->young_gen(); | |
| 657 PSOldGen* old_gen = heap->old_gen(); | |
| 658 | |
| 659 old_gen->compact(); | |
| 660 young_gen->compact(); | |
| 661 } | |
| 662 | |
| 663 jlong PSMarkSweep::millis_since_last_gc() { | |
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664 // We need a monotonically non-deccreasing time in ms but |
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665 // os::javaTimeMillis() does not guarantee monotonicity. |
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666 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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667 jlong ret_val = now - _time_of_last_gc; |
| 0 | 668 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
| 669 if (ret_val < 0) { | |
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670 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
| 0 | 671 return 0; |
| 672 } | |
| 673 return ret_val; | |
| 674 } | |
| 675 | |
| 676 void PSMarkSweep::reset_millis_since_last_gc() { | |
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677 // We need a monotonically non-deccreasing time in ms but |
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678 // os::javaTimeMillis() does not guarantee monotonicity. |
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679 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 680 } |