Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 17937:78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti
| author | drchase |
|---|---|
| date | Thu, 22 May 2014 15:52:41 -0400 |
| parents | 270d7cb38f40 |
| children | 52b4284cb496 0982ec23da03 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 |
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57 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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58 |
| 0 | 59 elapsedTimer PSMarkSweep::_accumulated_time; |
| 60 jlong PSMarkSweep::_time_of_last_gc = 0; | |
| 61 CollectorCounters* PSMarkSweep::_counters = NULL; | |
| 62 | |
| 63 void PSMarkSweep::initialize() { | |
| 64 MemRegion mr = Universe::heap()->reserved_region(); | |
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65 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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66 _counters = new CollectorCounters("PSMarkSweep", 1); |
| 0 | 67 } |
| 68 | |
| 69 // This method contains all heap specific policy for invoking mark sweep. | |
| 70 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
| 71 // the heap. It will do nothing further. If we need to bail out for policy | |
| 72 // reasons, scavenge before full gc, or any other specialized behavior, it | |
| 73 // needs to be added here. | |
| 74 // | |
| 75 // Note that this method should only be called from the vm_thread while | |
| 76 // at a safepoint! | |
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77 // |
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78 // Note that the all_soft_refs_clear flag in the collector policy |
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79 // may be true because this method can be called without intervening |
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80 // activity. For example when the heap space is tight and full measure |
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81 // are being taken to free space. |
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82 |
| 0 | 83 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
| 84 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 85 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 86 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 87 | |
| 88 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 89 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 90 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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91 IsGCActiveMark mark; |
| 0 | 92 |
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93 if (ScavengeBeforeFullGC) { |
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94 PSScavenge::invoke_no_policy(); |
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95 } |
| 0 | 96 |
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97 const bool clear_all_soft_refs = |
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98 heap->collector_policy()->should_clear_all_soft_refs(); |
| 0 | 99 |
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100 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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101 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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102 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
| 0 | 103 } |
| 104 | |
| 105 // This method contains no policy. You should probably | |
| 106 // be calling invoke() instead. | |
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107 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
| 0 | 108 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
| 109 assert(ref_processor() != NULL, "Sanity"); | |
| 110 | |
| 111 if (GC_locker::check_active_before_gc()) { | |
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112 return false; |
| 0 | 113 } |
| 114 | |
| 115 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 10405 | 116 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
| 0 | 117 GCCause::Cause gc_cause = heap->gc_cause(); |
| 10405 | 118 |
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119 _gc_timer->register_gc_start(); |
| 10405 | 120 _gc_tracer->report_gc_start(gc_cause, _gc_timer->gc_start()); |
| 121 | |
| 0 | 122 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); |
| 123 | |
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124 // The scope of casr should end after code that can change |
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125 // CollectorPolicy::_should_clear_all_soft_refs. |
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126 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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127 |
| 0 | 128 PSYoungGen* young_gen = heap->young_gen(); |
| 129 PSOldGen* old_gen = heap->old_gen(); | |
| 130 | |
| 131 // Increment the invocation count | |
| 132 heap->increment_total_collections(true /* full */); | |
| 133 | |
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134 // Save information needed to minimize mangling |
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135 heap->record_gen_tops_before_GC(); |
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136 |
| 0 | 137 // We need to track unique mark sweep invocations as well. |
| 138 _total_invocations++; | |
| 139 | |
| 140 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 141 | |
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142 heap->print_heap_before_gc(); |
| 10405 | 143 heap->trace_heap_before_gc(_gc_tracer); |
| 0 | 144 |
| 145 // Fill in TLABs | |
| 146 heap->accumulate_statistics_all_tlabs(); | |
| 147 heap->ensure_parsability(true); // retire TLABs | |
| 148 | |
| 149 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 150 HandleMark hm; // Discard invalid handles created during verification | |
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151 Universe::verify(" VerifyBeforeGC:"); |
| 0 | 152 } |
| 153 | |
| 154 // Verify object start arrays | |
| 155 if (VerifyObjectStartArray && | |
| 156 VerifyBeforeGC) { | |
| 157 old_gen->verify_object_start_array(); | |
| 158 } | |
| 159 | |
| 10405 | 160 heap->pre_full_gc_dump(_gc_timer); |
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161 |
| 0 | 162 // Filled in below to track the state of the young gen after the collection. |
| 163 bool eden_empty; | |
| 164 bool survivors_empty; | |
| 165 bool young_gen_empty; | |
| 166 | |
| 167 { | |
| 168 HandleMark hm; | |
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169 |
| 0 | 170 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 171 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 10405 | 172 GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL); |
| 0 | 173 TraceCollectorStats tcs(counters()); |
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174 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
| 0 | 175 |
| 176 if (TraceGen1Time) accumulated_time()->start(); | |
| 177 | |
| 178 // Let the size policy know we're starting | |
| 179 size_policy->major_collection_begin(); | |
| 180 | |
| 181 CodeCache::gc_prologue(); | |
| 182 Threads::gc_prologue(); | |
| 183 BiasedLocking::preserve_marks(); | |
| 184 | |
| 185 // Capture heap size before collection for printing. | |
| 186 size_t prev_used = heap->used(); | |
| 187 | |
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188 // Capture metadata size before collection for sizing. |
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189 size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
| 0 | 190 |
| 191 // For PrintGCDetails | |
| 192 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
| 193 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
| 194 | |
| 195 allocate_stacks(); | |
| 196 | |
| 197 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 198 | |
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199 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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200 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 201 |
| 202 mark_sweep_phase1(clear_all_softrefs); | |
| 203 | |
| 204 mark_sweep_phase2(); | |
| 205 | |
| 206 // Don't add any more derived pointers during phase3 | |
| 207 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 208 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 209 | |
| 210 mark_sweep_phase3(); | |
| 211 | |
| 212 mark_sweep_phase4(); | |
| 213 | |
| 214 restore_marks(); | |
| 215 | |
| 216 deallocate_stacks(); | |
| 217 | |
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218 if (ZapUnusedHeapArea) { |
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219 // Do a complete mangle (top to end) because the usage for |
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220 // scratch does not maintain a top pointer. |
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221 young_gen->to_space()->mangle_unused_area_complete(); |
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222 } |
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223 |
| 0 | 224 eden_empty = young_gen->eden_space()->is_empty(); |
| 225 if (!eden_empty) { | |
| 226 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
| 227 } | |
| 228 | |
| 229 // Update heap occupancy information which is used as | |
| 230 // input to soft ref clearing policy at the next gc. | |
| 231 Universe::update_heap_info_at_gc(); | |
| 232 | |
| 233 survivors_empty = young_gen->from_space()->is_empty() && | |
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234 young_gen->to_space()->is_empty(); |
| 0 | 235 young_gen_empty = eden_empty && survivors_empty; |
| 236 | |
| 237 BarrierSet* bs = heap->barrier_set(); | |
| 238 if (bs->is_a(BarrierSet::ModRef)) { | |
| 239 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
| 240 MemRegion old_mr = heap->old_gen()->reserved(); | |
| 241 if (young_gen_empty) { | |
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242 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 243 } else { |
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244 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
| 0 | 245 } |
| 246 } | |
| 247 | |
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248 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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249 ClassLoaderDataGraph::purge(); |
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250 MetaspaceAux::verify_metrics(); |
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251 |
| 0 | 252 BiasedLocking::restore_marks(); |
| 253 Threads::gc_epilogue(); | |
| 254 CodeCache::gc_epilogue(); | |
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255 JvmtiExport::gc_epilogue(); |
| 0 | 256 |
| 257 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 258 | |
| 259 ref_processor()->enqueue_discovered_references(NULL); | |
| 260 | |
| 261 // Update time of last GC | |
| 262 reset_millis_since_last_gc(); | |
| 263 | |
| 264 // Let the size policy know we're done | |
| 265 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
| 266 | |
| 267 if (UseAdaptiveSizePolicy) { | |
| 268 | |
| 269 if (PrintAdaptiveSizePolicy) { | |
| 270 gclog_or_tty->print("AdaptiveSizeStart: "); | |
| 271 gclog_or_tty->stamp(); | |
| 272 gclog_or_tty->print_cr(" collection: %d ", | |
| 273 heap->total_collections()); | |
| 274 if (Verbose) { | |
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275 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
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276 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
| 0 | 277 } |
| 278 } | |
| 279 | |
| 280 // Don't check if the size_policy is ready here. Let | |
| 281 // the size_policy check that internally. | |
| 282 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
| 283 ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 284 UseAdaptiveSizePolicyWithSystemGC)) { | |
| 285 // Calculate optimal free space amounts | |
| 286 assert(young_gen->max_size() > | |
| 287 young_gen->from_space()->capacity_in_bytes() + | |
| 288 young_gen->to_space()->capacity_in_bytes(), | |
| 289 "Sizes of space in young gen are out-of-bounds"); | |
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290 |
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291 size_t young_live = young_gen->used_in_bytes(); |
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292 size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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293 size_t old_live = old_gen->used_in_bytes(); |
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294 size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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295 size_t max_old_gen_size = old_gen->max_gen_size(); |
| 0 | 296 size_t max_eden_size = young_gen->max_size() - |
| 297 young_gen->from_space()->capacity_in_bytes() - | |
| 298 young_gen->to_space()->capacity_in_bytes(); | |
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299 |
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300 // Used for diagnostics |
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301 size_policy->clear_generation_free_space_flags(); |
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302 |
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303 size_policy->compute_generations_free_space(young_live, |
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304 eden_live, |
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305 old_live, |
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306 cur_eden, |
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307 max_old_gen_size, |
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308 max_eden_size, |
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309 true /* full gc*/); |
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310 |
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311 size_policy->check_gc_overhead_limit(young_live, |
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312 eden_live, |
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313 max_old_gen_size, |
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314 max_eden_size, |
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315 true /* full gc*/, |
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316 gc_cause, |
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317 heap->collector_policy()); |
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318 |
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319 size_policy->decay_supplemental_growth(true /* full gc*/); |
| 0 | 320 |
| 321 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
| 322 | |
| 323 // Don't resize the young generation at an major collection. A | |
| 324 // desired young generation size may have been calculated but | |
| 325 // resizing the young generation complicates the code because the | |
| 326 // resizing of the old generation may have moved the boundary | |
| 327 // between the young generation and the old generation. Let the | |
| 328 // young generation resizing happen at the minor collections. | |
| 329 } | |
| 330 if (PrintAdaptiveSizePolicy) { | |
| 331 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 332 heap->total_collections()); | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 if (UsePerfData) { | |
| 337 heap->gc_policy_counters()->update_counters(); | |
| 338 heap->gc_policy_counters()->update_old_capacity( | |
| 339 old_gen->capacity_in_bytes()); | |
| 340 heap->gc_policy_counters()->update_young_capacity( | |
| 341 young_gen->capacity_in_bytes()); | |
| 342 } | |
| 343 | |
| 344 heap->resize_all_tlabs(); | |
| 345 | |
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346 // We collected the heap, recalculate the metaspace capacity |
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347 MetaspaceGC::compute_new_size(); |
| 0 | 348 |
| 349 if (TraceGen1Time) accumulated_time()->stop(); | |
| 350 | |
| 351 if (PrintGC) { | |
| 352 if (PrintGCDetails) { | |
| 353 // Don't print a GC timestamp here. This is after the GC so | |
| 354 // would be confusing. | |
| 355 young_gen->print_used_change(young_gen_prev_used); | |
| 356 old_gen->print_used_change(old_gen_prev_used); | |
| 357 } | |
| 358 heap->print_heap_change(prev_used); | |
| 359 if (PrintGCDetails) { | |
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360 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 361 } |
| 362 } | |
| 363 | |
| 364 // Track memory usage and detect low memory | |
| 365 MemoryService::track_memory_usage(); | |
| 366 heap->update_counters(); | |
| 367 } | |
| 368 | |
| 369 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 370 HandleMark hm; // Discard invalid handles created during verification | |
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371 Universe::verify(" VerifyAfterGC:"); |
| 0 | 372 } |
| 373 | |
| 374 // Re-verify object start arrays | |
| 375 if (VerifyObjectStartArray && | |
| 376 VerifyAfterGC) { | |
| 377 old_gen->verify_object_start_array(); | |
| 378 } | |
| 379 | |
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380 if (ZapUnusedHeapArea) { |
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381 old_gen->object_space()->check_mangled_unused_area_complete(); |
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382 } |
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383 |
| 0 | 384 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
| 385 | |
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386 heap->print_heap_after_gc(); |
| 10405 | 387 heap->trace_heap_after_gc(_gc_tracer); |
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388 |
| 10405 | 389 heap->post_full_gc_dump(_gc_timer); |
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390 |
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391 #ifdef TRACESPINNING |
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392 ParallelTaskTerminator::print_termination_counts(); |
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393 #endif |
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394 |
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395 _gc_timer->register_gc_end(); |
| 10405 | 396 |
| 397 _gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
| 398 | |
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399 return true; |
| 0 | 400 } |
| 401 | |
| 402 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 403 PSYoungGen* young_gen, | |
| 404 PSOldGen* old_gen) { | |
| 405 MutableSpace* const eden_space = young_gen->eden_space(); | |
| 406 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
| 407 assert(young_gen->virtual_space()->alignment() == | |
| 408 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
| 409 | |
| 410 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
| 411 return false; | |
| 412 } | |
| 413 | |
| 414 // Both generations must be completely committed. | |
| 415 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
| 416 return false; | |
| 417 } | |
| 418 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
| 419 return false; | |
| 420 } | |
| 421 | |
| 422 // Figure out how much to take from eden. Include the average amount promoted | |
| 423 // in the total; otherwise the next young gen GC will simply bail out to a | |
| 424 // full GC. | |
| 425 const size_t alignment = old_gen->virtual_space()->alignment(); | |
| 426 const size_t eden_used = eden_space->used_in_bytes(); | |
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427 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
| 0 | 428 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
| 429 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
| 430 | |
| 431 if (absorb_size >= eden_capacity) { | |
| 432 return false; // Must leave some space in eden. | |
| 433 } | |
| 434 | |
| 435 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
| 436 if (new_young_size < young_gen->min_gen_size()) { | |
| 437 return false; // Respect young gen minimum size. | |
| 438 } | |
| 439 | |
| 440 if (TraceAdaptiveGCBoundary && Verbose) { | |
| 441 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
| 442 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
| 443 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
| 444 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
| 445 absorb_size / K, | |
| 446 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
| 447 young_gen->from_space()->used_in_bytes() / K, | |
| 448 young_gen->to_space()->used_in_bytes() / K, | |
| 449 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
| 450 } | |
| 451 | |
| 452 // Fill the unused part of the old gen. | |
| 453 MutableSpace* const old_space = old_gen->object_space(); | |
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454 HeapWord* const unused_start = old_space->top(); |
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455 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
| 0 | 456 |
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457 if (unused_words > 0) { |
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458 if (unused_words < CollectedHeap::min_fill_size()) { |
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459 return false; // If the old gen cannot be filled, must give up. |
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460 } |
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461 CollectedHeap::fill_with_objects(unused_start, unused_words); |
| 0 | 462 } |
| 463 | |
| 464 // Take the live data from eden and set both top and end in the old gen to | |
| 465 // eden top. (Need to set end because reset_after_change() mangles the region | |
| 466 // from end to virtual_space->high() in debug builds). | |
| 467 HeapWord* const new_top = eden_space->top(); | |
| 468 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
| 469 absorb_size); | |
| 470 young_gen->reset_after_change(); | |
| 471 old_space->set_top(new_top); | |
| 472 old_space->set_end(new_top); | |
| 473 old_gen->reset_after_change(); | |
| 474 | |
| 475 // Update the object start array for the filler object and the data from eden. | |
| 476 ObjectStartArray* const start_array = old_gen->start_array(); | |
|
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477 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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478 start_array->allocate_block(p); |
| 0 | 479 } |
| 480 | |
| 481 // Could update the promoted average here, but it is not typically updated at | |
| 482 // full GCs and the value to use is unclear. Something like | |
| 483 // | |
| 484 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
| 485 | |
| 486 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
| 487 return true; | |
| 488 } | |
| 489 | |
| 490 void PSMarkSweep::allocate_stacks() { | |
| 491 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 492 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 493 | |
| 494 PSYoungGen* young_gen = heap->young_gen(); | |
| 495 | |
| 496 MutableSpace* to_space = young_gen->to_space(); | |
| 497 _preserved_marks = (PreservedMark*)to_space->top(); | |
| 498 _preserved_count = 0; | |
| 499 | |
| 500 // We want to calculate the size in bytes first. | |
| 501 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
| 502 // Now divide by the size of a PreservedMark | |
| 503 _preserved_count_max /= sizeof(PreservedMark); | |
| 504 } | |
| 505 | |
| 506 | |
| 507 void PSMarkSweep::deallocate_stacks() { | |
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508 _preserved_mark_stack.clear(true); |
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509 _preserved_oop_stack.clear(true); |
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510 _marking_stack.clear(); |
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511 _objarray_stack.clear(true); |
| 0 | 512 } |
| 513 | |
| 514 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
| 515 // Recursively traverse all live objects and mark them | |
| 10405 | 516 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 517 trace(" 1"); |
| 518 | |
| 519 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 520 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 521 | |
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522 // Need to clear claim bits before the tracing starts. |
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523 ClassLoaderDataGraph::clear_claimed_marks(); |
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524 |
| 0 | 525 // General strong roots. |
|
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526 { |
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527 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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528 Universe::oops_do(mark_and_push_closure()); |
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529 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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530 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
|
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531 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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532 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
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533 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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534 FlatProfiler::oops_do(mark_and_push_closure()); |
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535 Management::oops_do(mark_and_push_closure()); |
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536 JvmtiExport::oops_do(mark_and_push_closure()); |
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537 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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538 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
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539 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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540 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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541 } |
| 0 | 542 |
| 543 // Flush marking stack. | |
| 544 follow_stack(); | |
| 545 | |
| 546 // Process reference objects found during marking | |
| 547 { | |
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548 ref_processor()->setup_policy(clear_all_softrefs); |
| 10405 | 549 const ReferenceProcessorStats& stats = |
| 550 ref_processor()->process_discovered_references( | |
| 551 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer); | |
| 552 gc_tracer()->report_gc_reference_stats(stats); | |
| 0 | 553 } |
| 554 | |
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555 // This is the point where the entire marking should have completed. |
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556 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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557 |
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558 // Unload classes and purge the SystemDictionary. |
| 0 | 559 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
| 560 | |
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561 // Unload nmethods. |
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562 CodeCache::do_unloading(is_alive_closure(), purged_class); |
| 0 | 563 |
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564 // Prune dead klasses from subklass/sibling/implementor lists. |
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565 Klass::clean_weak_klass_links(is_alive_closure()); |
| 941 | 566 |
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567 // Delete entries for dead interned strings. |
| 0 | 568 StringTable::unlink(is_alive_closure()); |
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569 |
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570 // Clean up unreferenced symbols in symbol table. |
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571 SymbolTable::unlink(); |
| 10405 | 572 _gc_tracer->report_object_count_after_gc(is_alive_closure()); |
| 0 | 573 } |
| 574 | |
| 575 | |
| 576 void PSMarkSweep::mark_sweep_phase2() { | |
| 10405 | 577 GCTraceTime tm("phase 2", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 578 trace("2"); |
| 579 | |
| 580 // Now all live objects are marked, compute the new object addresses. | |
| 581 | |
| 582 // It is not required that we traverse spaces in the same order in | |
| 583 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 584 // tracking expects us to do so. See comment under phase4. | |
| 585 | |
| 586 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 587 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 588 | |
| 589 PSOldGen* old_gen = heap->old_gen(); | |
| 590 | |
| 591 // Begin compacting into the old gen | |
| 592 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
| 593 | |
| 594 // This will also compact the young gen spaces. | |
| 595 old_gen->precompact(); | |
| 596 } | |
| 597 | |
| 598 // This should be moved to the shared markSweep code! | |
| 599 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
| 600 public: | |
| 601 bool do_object_b(oop p) { return true; } | |
| 602 }; | |
| 603 static PSAlwaysTrueClosure always_true; | |
| 604 | |
| 605 void PSMarkSweep::mark_sweep_phase3() { | |
| 606 // Adjust the pointers to reflect the new locations | |
| 10405 | 607 GCTraceTime tm("phase 3", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 608 trace("3"); |
| 609 | |
| 610 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 611 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 612 | |
| 613 PSYoungGen* young_gen = heap->young_gen(); | |
| 614 PSOldGen* old_gen = heap->old_gen(); | |
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615 |
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616 // Need to clear claim bits before the tracing starts. |
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617 ClassLoaderDataGraph::clear_claimed_marks(); |
| 0 | 618 |
| 619 // General strong roots. | |
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620 Universe::oops_do(adjust_pointer_closure()); |
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621 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
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622 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
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623 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
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624 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
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625 FlatProfiler::oops_do(adjust_pointer_closure()); |
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626 Management::oops_do(adjust_pointer_closure()); |
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627 JvmtiExport::oops_do(adjust_pointer_closure()); |
| 0 | 628 // SO_AllClasses |
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629 SystemDictionary::oops_do(adjust_pointer_closure()); |
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630 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
| 0 | 631 |
| 632 // Now adjust pointers in remaining weak roots. (All of which should | |
| 633 // have been cleared if they pointed to non-surviving objects.) | |
| 634 // Global (weak) JNI handles | |
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635 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
| 0 | 636 |
| 637 CodeCache::oops_do(adjust_pointer_closure()); | |
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638 StringTable::oops_do(adjust_pointer_closure()); |
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639 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
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640 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
| 0 | 641 |
| 642 adjust_marks(); | |
| 643 | |
| 644 young_gen->adjust_pointers(); | |
| 645 old_gen->adjust_pointers(); | |
| 646 } | |
| 647 | |
| 648 void PSMarkSweep::mark_sweep_phase4() { | |
| 649 EventMark m("4 compact heap"); | |
| 10405 | 650 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer); |
| 0 | 651 trace("4"); |
| 652 | |
| 653 // All pointers are now adjusted, move objects accordingly | |
| 654 | |
| 655 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 656 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 657 | |
| 658 PSYoungGen* young_gen = heap->young_gen(); | |
| 659 PSOldGen* old_gen = heap->old_gen(); | |
| 660 | |
| 661 old_gen->compact(); | |
| 662 young_gen->compact(); | |
| 663 } | |
| 664 | |
| 665 jlong PSMarkSweep::millis_since_last_gc() { | |
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666 // We need a monotonically non-deccreasing time in ms but |
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667 // os::javaTimeMillis() does not guarantee monotonicity. |
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668 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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669 jlong ret_val = now - _time_of_last_gc; |
| 0 | 670 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
| 671 if (ret_val < 0) { | |
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672 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
| 0 | 673 return 0; |
| 674 } | |
| 675 return ret_val; | |
| 676 } | |
| 677 | |
| 678 void PSMarkSweep::reset_millis_since_last_gc() { | |
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679 // We need a monotonically non-deccreasing time in ms but |
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680 // os::javaTimeMillis() does not guarantee monotonicity. |
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681 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 682 } |