Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 4913:ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
Reviewed-by: stefank, jmasa
| author | jcoomes |
|---|---|
| date | Thu, 16 Feb 2012 13:12:25 -0800 |
| parents | aa3d708d67c4 |
| children | 9d679effd28c |
| 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/psPermGen.hpp" | |
| 36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 37 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
| 38 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 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 unsigned int PSMarkSweep::_total_invocations = 0; | |
| 56 jlong PSMarkSweep::_time_of_last_gc = 0; | |
| 57 CollectorCounters* PSMarkSweep::_counters = NULL; | |
| 58 | |
| 59 void PSMarkSweep::initialize() { | |
| 60 MemRegion mr = Universe::heap()->reserved_region(); | |
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61 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
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62 _counters = new CollectorCounters("PSMarkSweep", 1); |
| 0 | 63 } |
| 64 | |
| 65 // This method contains all heap specific policy for invoking mark sweep. | |
| 66 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
| 67 // the heap. It will do nothing further. If we need to bail out for policy | |
| 68 // reasons, scavenge before full gc, or any other specialized behavior, it | |
| 69 // needs to be added here. | |
| 70 // | |
| 71 // Note that this method should only be called from the vm_thread while | |
| 72 // at a safepoint! | |
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73 // |
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74 // Note that the all_soft_refs_clear flag in the collector policy |
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75 // may be true because this method can be called without intervening |
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76 // activity. For example when the heap space is tight and full measure |
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77 // are being taken to free space. |
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78 |
| 0 | 79 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
| 80 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 81 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 82 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 83 | |
| 84 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 85 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 86 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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87 IsGCActiveMark mark; |
| 0 | 88 |
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89 if (ScavengeBeforeFullGC) { |
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90 PSScavenge::invoke_no_policy(); |
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91 } |
| 0 | 92 |
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93 const bool clear_all_soft_refs = |
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94 heap->collector_policy()->should_clear_all_soft_refs(); |
| 0 | 95 |
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96 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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97 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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98 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
| 0 | 99 } |
| 100 | |
| 101 // This method contains no policy. You should probably | |
| 102 // be calling invoke() instead. | |
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103 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
| 0 | 104 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
| 105 assert(ref_processor() != NULL, "Sanity"); | |
| 106 | |
| 107 if (GC_locker::check_active_before_gc()) { | |
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108 return false; |
| 0 | 109 } |
| 110 | |
| 111 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 112 GCCause::Cause gc_cause = heap->gc_cause(); | |
| 113 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 114 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
| 115 | |
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116 // The scope of casr should end after code that can change |
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117 // CollectorPolicy::_should_clear_all_soft_refs. |
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118 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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119 |
| 0 | 120 PSYoungGen* young_gen = heap->young_gen(); |
| 121 PSOldGen* old_gen = heap->old_gen(); | |
| 122 PSPermGen* perm_gen = heap->perm_gen(); | |
| 123 | |
| 124 // Increment the invocation count | |
| 125 heap->increment_total_collections(true /* full */); | |
| 126 | |
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127 // Save information needed to minimize mangling |
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128 heap->record_gen_tops_before_GC(); |
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129 |
| 0 | 130 // We need to track unique mark sweep invocations as well. |
| 131 _total_invocations++; | |
| 132 | |
| 133 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
| 134 | |
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135 heap->print_heap_before_gc(); |
| 0 | 136 |
| 137 // Fill in TLABs | |
| 138 heap->accumulate_statistics_all_tlabs(); | |
| 139 heap->ensure_parsability(true); // retire TLABs | |
| 140 | |
| 141 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 142 HandleMark hm; // Discard invalid handles created during verification | |
| 143 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 144 Universe::verify(true); | |
| 145 } | |
| 146 | |
| 147 // Verify object start arrays | |
| 148 if (VerifyObjectStartArray && | |
| 149 VerifyBeforeGC) { | |
| 150 old_gen->verify_object_start_array(); | |
| 151 perm_gen->verify_object_start_array(); | |
| 152 } | |
| 153 | |
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154 heap->pre_full_gc_dump(); |
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155 |
| 0 | 156 // Filled in below to track the state of the young gen after the collection. |
| 157 bool eden_empty; | |
| 158 bool survivors_empty; | |
| 159 bool young_gen_empty; | |
| 160 | |
| 161 { | |
| 162 HandleMark hm; | |
| 163 const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc; | |
| 164 // This is useful for debugging but don't change the output the | |
| 165 // the customer sees. | |
| 166 const char* gc_cause_str = "Full GC"; | |
| 167 if (is_system_gc && PrintGCDetails) { | |
| 168 gc_cause_str = "Full GC (System)"; | |
| 169 } | |
| 170 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 171 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 172 TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty); | |
| 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 // When collecting the permanent generation methodOops may be moving, | |
| 182 // so we either have to flush all bcp data or convert it into bci. | |
| 183 CodeCache::gc_prologue(); | |
| 184 Threads::gc_prologue(); | |
| 185 BiasedLocking::preserve_marks(); | |
| 186 | |
| 187 // Capture heap size before collection for printing. | |
| 188 size_t prev_used = heap->used(); | |
| 189 | |
| 190 // Capture perm gen size before collection for sizing. | |
| 191 size_t perm_gen_prev_used = perm_gen->used_in_bytes(); | |
| 192 | |
| 193 // For PrintGCDetails | |
| 194 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
| 195 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
| 196 | |
| 197 allocate_stacks(); | |
| 198 | |
| 199 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 200 | |
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201 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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202 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 203 |
| 204 mark_sweep_phase1(clear_all_softrefs); | |
| 205 | |
| 206 mark_sweep_phase2(); | |
| 207 | |
| 208 // Don't add any more derived pointers during phase3 | |
| 209 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 210 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 211 | |
| 212 mark_sweep_phase3(); | |
| 213 | |
| 214 mark_sweep_phase4(); | |
| 215 | |
| 216 restore_marks(); | |
| 217 | |
| 218 deallocate_stacks(); | |
| 219 | |
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220 if (ZapUnusedHeapArea) { |
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221 // Do a complete mangle (top to end) because the usage for |
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222 // scratch does not maintain a top pointer. |
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223 young_gen->to_space()->mangle_unused_area_complete(); |
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224 } |
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225 |
| 0 | 226 eden_empty = young_gen->eden_space()->is_empty(); |
| 227 if (!eden_empty) { | |
| 228 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
| 229 } | |
| 230 | |
| 231 // Update heap occupancy information which is used as | |
| 232 // input to soft ref clearing policy at the next gc. | |
| 233 Universe::update_heap_info_at_gc(); | |
| 234 | |
| 235 survivors_empty = young_gen->from_space()->is_empty() && | |
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236 young_gen->to_space()->is_empty(); |
| 0 | 237 young_gen_empty = eden_empty && survivors_empty; |
| 238 | |
| 239 BarrierSet* bs = heap->barrier_set(); | |
| 240 if (bs->is_a(BarrierSet::ModRef)) { | |
| 241 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
| 242 MemRegion old_mr = heap->old_gen()->reserved(); | |
| 243 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
| 244 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
| 245 | |
| 246 if (young_gen_empty) { | |
| 247 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
| 248 } else { | |
| 249 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 BiasedLocking::restore_marks(); | |
| 254 Threads::gc_epilogue(); | |
| 255 CodeCache::gc_epilogue(); | |
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256 JvmtiExport::gc_epilogue(); |
| 0 | 257 |
| 258 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 259 | |
| 260 ref_processor()->enqueue_discovered_references(NULL); | |
| 261 | |
| 262 // Update time of last GC | |
| 263 reset_millis_since_last_gc(); | |
| 264 | |
| 265 // Let the size policy know we're done | |
| 266 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
| 267 | |
| 268 if (UseAdaptiveSizePolicy) { | |
| 269 | |
| 270 if (PrintAdaptiveSizePolicy) { | |
| 271 gclog_or_tty->print("AdaptiveSizeStart: "); | |
| 272 gclog_or_tty->stamp(); | |
| 273 gclog_or_tty->print_cr(" collection: %d ", | |
| 274 heap->total_collections()); | |
| 275 if (Verbose) { | |
| 276 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
| 277 " perm_gen_capacity: %d ", | |
| 278 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
| 279 perm_gen->capacity_in_bytes()); | |
| 280 } | |
| 281 } | |
| 282 | |
| 283 // Don't check if the size_policy is ready here. Let | |
| 284 // the size_policy check that internally. | |
| 285 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
| 286 ((gc_cause != GCCause::_java_lang_system_gc) || | |
| 287 UseAdaptiveSizePolicyWithSystemGC)) { | |
| 288 // Calculate optimal free space amounts | |
| 289 assert(young_gen->max_size() > | |
| 290 young_gen->from_space()->capacity_in_bytes() + | |
| 291 young_gen->to_space()->capacity_in_bytes(), | |
| 292 "Sizes of space in young gen are out-of-bounds"); | |
| 293 size_t max_eden_size = young_gen->max_size() - | |
| 294 young_gen->from_space()->capacity_in_bytes() - | |
| 295 young_gen->to_space()->capacity_in_bytes(); | |
| 296 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
| 297 young_gen->eden_space()->used_in_bytes(), | |
| 298 old_gen->used_in_bytes(), | |
| 299 perm_gen->used_in_bytes(), | |
| 300 young_gen->eden_space()->capacity_in_bytes(), | |
| 301 old_gen->max_gen_size(), | |
| 302 max_eden_size, | |
| 303 true /* full gc*/, | |
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304 gc_cause, |
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305 heap->collector_policy()); |
| 0 | 306 |
| 307 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
| 308 | |
| 309 // Don't resize the young generation at an major collection. A | |
| 310 // desired young generation size may have been calculated but | |
| 311 // resizing the young generation complicates the code because the | |
| 312 // resizing of the old generation may have moved the boundary | |
| 313 // between the young generation and the old generation. Let the | |
| 314 // young generation resizing happen at the minor collections. | |
| 315 } | |
| 316 if (PrintAdaptiveSizePolicy) { | |
| 317 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
| 318 heap->total_collections()); | |
| 319 } | |
| 320 } | |
| 321 | |
| 322 if (UsePerfData) { | |
| 323 heap->gc_policy_counters()->update_counters(); | |
| 324 heap->gc_policy_counters()->update_old_capacity( | |
| 325 old_gen->capacity_in_bytes()); | |
| 326 heap->gc_policy_counters()->update_young_capacity( | |
| 327 young_gen->capacity_in_bytes()); | |
| 328 } | |
| 329 | |
| 330 heap->resize_all_tlabs(); | |
| 331 | |
| 332 // We collected the perm gen, so we'll resize it here. | |
| 333 perm_gen->compute_new_size(perm_gen_prev_used); | |
| 334 | |
| 335 if (TraceGen1Time) accumulated_time()->stop(); | |
| 336 | |
| 337 if (PrintGC) { | |
| 338 if (PrintGCDetails) { | |
| 339 // Don't print a GC timestamp here. This is after the GC so | |
| 340 // would be confusing. | |
| 341 young_gen->print_used_change(young_gen_prev_used); | |
| 342 old_gen->print_used_change(old_gen_prev_used); | |
| 343 } | |
| 344 heap->print_heap_change(prev_used); | |
| 345 // Do perm gen after heap becase prev_used does | |
| 346 // not include the perm gen (done this way in the other | |
| 347 // collectors). | |
| 348 if (PrintGCDetails) { | |
| 349 perm_gen->print_used_change(perm_gen_prev_used); | |
| 350 } | |
| 351 } | |
| 352 | |
| 353 // Track memory usage and detect low memory | |
| 354 MemoryService::track_memory_usage(); | |
| 355 heap->update_counters(); | |
| 356 } | |
| 357 | |
| 358 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
| 359 HandleMark hm; // Discard invalid handles created during verification | |
| 360 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 361 Universe::verify(false); | |
| 362 } | |
| 363 | |
| 364 // Re-verify object start arrays | |
| 365 if (VerifyObjectStartArray && | |
| 366 VerifyAfterGC) { | |
| 367 old_gen->verify_object_start_array(); | |
| 368 perm_gen->verify_object_start_array(); | |
| 369 } | |
| 370 | |
|
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371 if (ZapUnusedHeapArea) { |
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372 old_gen->object_space()->check_mangled_unused_area_complete(); |
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373 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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374 } |
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375 |
| 0 | 376 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
| 377 | |
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378 heap->print_heap_after_gc(); |
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379 |
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380 heap->post_full_gc_dump(); |
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381 |
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382 #ifdef TRACESPINNING |
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383 ParallelTaskTerminator::print_termination_counts(); |
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384 #endif |
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385 |
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386 return true; |
| 0 | 387 } |
| 388 | |
| 389 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
| 390 PSYoungGen* young_gen, | |
| 391 PSOldGen* old_gen) { | |
| 392 MutableSpace* const eden_space = young_gen->eden_space(); | |
| 393 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
| 394 assert(young_gen->virtual_space()->alignment() == | |
| 395 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
| 396 | |
| 397 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
| 398 return false; | |
| 399 } | |
| 400 | |
| 401 // Both generations must be completely committed. | |
| 402 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
| 403 return false; | |
| 404 } | |
| 405 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
| 406 return false; | |
| 407 } | |
| 408 | |
| 409 // Figure out how much to take from eden. Include the average amount promoted | |
| 410 // in the total; otherwise the next young gen GC will simply bail out to a | |
| 411 // full GC. | |
| 412 const size_t alignment = old_gen->virtual_space()->alignment(); | |
| 413 const size_t eden_used = eden_space->used_in_bytes(); | |
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414 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
| 0 | 415 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
| 416 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
| 417 | |
| 418 if (absorb_size >= eden_capacity) { | |
| 419 return false; // Must leave some space in eden. | |
| 420 } | |
| 421 | |
| 422 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
| 423 if (new_young_size < young_gen->min_gen_size()) { | |
| 424 return false; // Respect young gen minimum size. | |
| 425 } | |
| 426 | |
| 427 if (TraceAdaptiveGCBoundary && Verbose) { | |
| 428 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
| 429 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
| 430 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
| 431 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
| 432 absorb_size / K, | |
| 433 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
| 434 young_gen->from_space()->used_in_bytes() / K, | |
| 435 young_gen->to_space()->used_in_bytes() / K, | |
| 436 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
| 437 } | |
| 438 | |
| 439 // Fill the unused part of the old gen. | |
| 440 MutableSpace* const old_space = old_gen->object_space(); | |
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441 HeapWord* const unused_start = old_space->top(); |
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442 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
| 0 | 443 |
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444 if (unused_words > 0) { |
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445 if (unused_words < CollectedHeap::min_fill_size()) { |
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446 return false; // If the old gen cannot be filled, must give up. |
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447 } |
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448 CollectedHeap::fill_with_objects(unused_start, unused_words); |
| 0 | 449 } |
| 450 | |
| 451 // Take the live data from eden and set both top and end in the old gen to | |
| 452 // eden top. (Need to set end because reset_after_change() mangles the region | |
| 453 // from end to virtual_space->high() in debug builds). | |
| 454 HeapWord* const new_top = eden_space->top(); | |
| 455 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
| 456 absorb_size); | |
| 457 young_gen->reset_after_change(); | |
| 458 old_space->set_top(new_top); | |
| 459 old_space->set_end(new_top); | |
| 460 old_gen->reset_after_change(); | |
| 461 | |
| 462 // Update the object start array for the filler object and the data from eden. | |
| 463 ObjectStartArray* const start_array = old_gen->start_array(); | |
|
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464 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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465 start_array->allocate_block(p); |
| 0 | 466 } |
| 467 | |
| 468 // Could update the promoted average here, but it is not typically updated at | |
| 469 // full GCs and the value to use is unclear. Something like | |
| 470 // | |
| 471 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
| 472 | |
| 473 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
| 474 return true; | |
| 475 } | |
| 476 | |
| 477 void PSMarkSweep::allocate_stacks() { | |
| 478 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 479 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 480 | |
| 481 PSYoungGen* young_gen = heap->young_gen(); | |
| 482 | |
| 483 MutableSpace* to_space = young_gen->to_space(); | |
| 484 _preserved_marks = (PreservedMark*)to_space->top(); | |
| 485 _preserved_count = 0; | |
| 486 | |
| 487 // We want to calculate the size in bytes first. | |
| 488 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
| 489 // Now divide by the size of a PreservedMark | |
| 490 _preserved_count_max /= sizeof(PreservedMark); | |
| 491 } | |
| 492 | |
| 493 | |
| 494 void PSMarkSweep::deallocate_stacks() { | |
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495 _preserved_mark_stack.clear(true); |
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496 _preserved_oop_stack.clear(true); |
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497 _marking_stack.clear(); |
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498 _objarray_stack.clear(true); |
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499 _revisit_klass_stack.clear(true); |
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500 _revisit_mdo_stack.clear(true); |
| 0 | 501 } |
| 502 | |
| 503 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
| 504 // Recursively traverse all live objects and mark them | |
| 505 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 506 trace(" 1"); | |
| 507 | |
| 508 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 509 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 510 | |
| 511 // General strong roots. | |
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512 { |
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513 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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514 Universe::oops_do(mark_and_push_closure()); |
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515 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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516 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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517 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
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518 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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519 FlatProfiler::oops_do(mark_and_push_closure()); |
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520 Management::oops_do(mark_and_push_closure()); |
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521 JvmtiExport::oops_do(mark_and_push_closure()); |
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522 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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523 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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524 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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525 } |
| 0 | 526 |
| 527 // Flush marking stack. | |
| 528 follow_stack(); | |
| 529 | |
| 530 // Process reference objects found during marking | |
| 531 { | |
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532 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 533 ref_processor()->process_discovered_references( |
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534 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
| 0 | 535 } |
| 536 | |
| 537 // Follow system dictionary roots and unload classes | |
| 538 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
| 539 | |
| 540 // Follow code cache roots | |
| 541 CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(), | |
| 542 purged_class); | |
| 543 follow_stack(); // Flush marking stack | |
| 544 | |
| 545 // Update subklass/sibling/implementor links of live klasses | |
| 546 follow_weak_klass_links(); | |
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547 assert(_marking_stack.is_empty(), "just drained"); |
| 0 | 548 |
| 941 | 549 // Visit memoized mdo's and clear unmarked weak refs |
| 550 follow_mdo_weak_refs(); | |
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551 assert(_marking_stack.is_empty(), "just drained"); |
| 941 | 552 |
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553 // Visit interned string tables and delete unmarked oops |
| 0 | 554 StringTable::unlink(is_alive_closure()); |
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555 // Clean up unreferenced symbols in symbol table. |
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556 SymbolTable::unlink(); |
| 0 | 557 |
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558 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
| 0 | 559 } |
| 560 | |
| 561 | |
| 562 void PSMarkSweep::mark_sweep_phase2() { | |
| 563 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 564 trace("2"); | |
| 565 | |
| 566 // Now all live objects are marked, compute the new object addresses. | |
| 567 | |
| 568 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 569 // allowed a range of dead object may get overwritten by a dead int | |
| 570 // array. If perm_gen is not traversed last a klassOop may get | |
| 571 // overwritten. This is fine since it is dead, but if the class has dead | |
| 572 // instances we have to skip them, and in order to find their size we | |
| 573 // need the klassOop! | |
| 574 // | |
| 575 // It is not required that we traverse spaces in the same order in | |
| 576 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 577 // tracking expects us to do so. See comment under phase4. | |
| 578 | |
| 579 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 580 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 581 | |
| 582 PSOldGen* old_gen = heap->old_gen(); | |
| 583 PSPermGen* perm_gen = heap->perm_gen(); | |
| 584 | |
| 585 // Begin compacting into the old gen | |
| 586 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
| 587 | |
| 588 // This will also compact the young gen spaces. | |
| 589 old_gen->precompact(); | |
| 590 | |
| 591 // Compact the perm gen into the perm gen | |
| 592 PSMarkSweepDecorator::set_destination_decorator_perm_gen(); | |
| 593 | |
| 594 perm_gen->precompact(); | |
| 595 } | |
| 596 | |
| 597 // This should be moved to the shared markSweep code! | |
| 598 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
| 599 public: | |
| 600 void do_object(oop p) { ShouldNotReachHere(); } | |
| 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 | |
| 607 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 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(); | |
| 615 PSPermGen* perm_gen = heap->perm_gen(); | |
| 616 | |
| 617 // General strong roots. | |
| 618 Universe::oops_do(adjust_root_pointer_closure()); | |
| 619 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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620 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
| 0 | 621 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
| 622 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
| 623 Management::oops_do(adjust_root_pointer_closure()); | |
| 624 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
| 625 // SO_AllClasses | |
| 626 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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627 //CodeCache::scavenge_root_nmethods_oops_do(adjust_root_pointer_closure()); |
| 0 | 628 |
| 629 // Now adjust pointers in remaining weak roots. (All of which should | |
| 630 // have been cleared if they pointed to non-surviving objects.) | |
| 631 // Global (weak) JNI handles | |
| 632 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
| 633 | |
| 634 CodeCache::oops_do(adjust_pointer_closure()); | |
| 635 StringTable::oops_do(adjust_root_pointer_closure()); | |
| 636 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
| 637 PSScavenge::reference_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
| 638 | |
| 639 adjust_marks(); | |
| 640 | |
| 641 young_gen->adjust_pointers(); | |
| 642 old_gen->adjust_pointers(); | |
| 643 perm_gen->adjust_pointers(); | |
| 644 } | |
| 645 | |
| 646 void PSMarkSweep::mark_sweep_phase4() { | |
| 647 EventMark m("4 compact heap"); | |
| 648 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
| 649 trace("4"); | |
| 650 | |
| 651 // All pointers are now adjusted, move objects accordingly | |
| 652 | |
| 653 // It is imperative that we traverse perm_gen first in phase4. All | |
| 654 // classes must be allocated earlier than their instances, and traversing | |
| 655 // perm_gen first makes sure that all klassOops have moved to their new | |
| 656 // location before any instance does a dispatch through it's klass! | |
| 657 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 658 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 659 | |
| 660 PSYoungGen* young_gen = heap->young_gen(); | |
| 661 PSOldGen* old_gen = heap->old_gen(); | |
| 662 PSPermGen* perm_gen = heap->perm_gen(); | |
| 663 | |
| 664 perm_gen->compact(); | |
| 665 old_gen->compact(); | |
| 666 young_gen->compact(); | |
| 667 } | |
| 668 | |
| 669 jlong PSMarkSweep::millis_since_last_gc() { | |
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670 // We need a monotonically non-deccreasing time in ms but |
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671 // os::javaTimeMillis() does not guarantee monotonicity. |
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672 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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673 jlong ret_val = now - _time_of_last_gc; |
| 0 | 674 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
| 675 if (ret_val < 0) { | |
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676 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
| 0 | 677 return 0; |
| 678 } | |
| 679 return ret_val; | |
| 680 } | |
| 681 | |
| 682 void PSMarkSweep::reset_millis_since_last_gc() { | |
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683 // We need a monotonically non-deccreasing time in ms but |
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684 // os::javaTimeMillis() does not guarantee monotonicity. |
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685 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 686 } |