Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 17736:58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
Reviewed-by: tschatzl, pliden
| author | brutisso |
|---|---|
| date | Fri, 14 Mar 2014 10:15:46 +0100 |
| parents | 5a32d2a3cc1e |
| children | 595c0f60d50d |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/javaClasses.hpp" | |
| 27 #include "classfile/symbolTable.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/codeCache.hpp" | |
| 31 #include "code/icBuffer.hpp" | |
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32 #include "gc_implementation/g1/g1Log.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 10405 | 34 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 35 #include "gc_implementation/shared/gcTimer.hpp" | |
| 36 #include "gc_implementation/shared/gcTrace.hpp" | |
| 37 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 1972 | 38 #include "memory/gcLocker.hpp" |
| 39 #include "memory/genCollectedHeap.hpp" | |
| 40 #include "memory/modRefBarrierSet.hpp" | |
| 41 #include "memory/referencePolicy.hpp" | |
| 42 #include "memory/space.hpp" | |
| 43 #include "oops/instanceRefKlass.hpp" | |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "prims/jvmtiExport.hpp" | |
| 46 #include "runtime/biasedLocking.hpp" | |
| 47 #include "runtime/fprofiler.hpp" | |
| 48 #include "runtime/synchronizer.hpp" | |
| 49 #include "runtime/thread.hpp" | |
| 50 #include "runtime/vmThread.hpp" | |
| 51 #include "utilities/copy.hpp" | |
| 52 #include "utilities/events.hpp" | |
| 342 | 53 |
| 54 class HeapRegion; | |
| 55 | |
| 56 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
| 57 bool clear_all_softrefs) { | |
| 58 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 59 | |
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60 SharedHeap* sh = SharedHeap::heap(); |
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61 #ifdef ASSERT |
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62 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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63 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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64 } |
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65 #endif |
| 342 | 66 // hook up weak ref data so it can be used during Mark-Sweep |
| 67 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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68 assert(rp != NULL, "should be non-NULL"); |
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69 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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70 |
| 342 | 71 GenMarkSweep::_ref_processor = rp; |
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72 rp->setup_policy(clear_all_softrefs); |
| 342 | 73 |
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74 // When collecting the permanent generation Method*s may be moving, |
| 342 | 75 // so we either have to flush all bcp data or convert it into bci. |
| 76 CodeCache::gc_prologue(); | |
| 77 Threads::gc_prologue(); | |
| 78 | |
| 79 bool marked_for_unloading = false; | |
| 80 | |
| 81 allocate_stacks(); | |
| 82 | |
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83 // We should save the marks of the currently locked biased monitors. |
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84 // The marking doesn't preserve the marks of biased objects. |
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85 BiasedLocking::preserve_marks(); |
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86 |
| 342 | 87 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
| 88 | |
| 89 mark_sweep_phase2(); | |
| 90 | |
| 91 // Don't add any more derived pointers during phase3 | |
| 92 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 93 | |
| 94 mark_sweep_phase3(); | |
| 95 | |
| 96 mark_sweep_phase4(); | |
| 97 | |
| 98 GenMarkSweep::restore_marks(); | |
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99 BiasedLocking::restore_marks(); |
| 342 | 100 GenMarkSweep::deallocate_stacks(); |
| 101 | |
| 102 // "free at last gc" is calculated from these. | |
| 103 // CHF: cheating for now!!! | |
| 104 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
| 105 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
| 106 | |
| 107 Threads::gc_epilogue(); | |
| 108 CodeCache::gc_epilogue(); | |
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109 JvmtiExport::gc_epilogue(); |
| 342 | 110 |
| 111 // refs processing: clean slate | |
| 112 GenMarkSweep::_ref_processor = NULL; | |
| 113 } | |
| 114 | |
| 115 | |
| 116 void G1MarkSweep::allocate_stacks() { | |
| 117 GenMarkSweep::_preserved_count_max = 0; | |
| 118 GenMarkSweep::_preserved_marks = NULL; | |
| 119 GenMarkSweep::_preserved_count = 0; | |
| 120 } | |
| 121 | |
| 122 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 123 bool clear_all_softrefs) { | |
| 124 // Recursively traverse all live objects and mark them | |
| 10405 | 125 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer()); |
| 342 | 126 GenMarkSweep::trace(" 1"); |
| 127 | |
| 128 SharedHeap* sh = SharedHeap::heap(); | |
| 129 | |
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130 // Need cleared claim bits for the strong roots processing |
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131 ClassLoaderDataGraph::clear_claimed_marks(); |
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132 |
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133 sh->process_strong_roots(true, // activate StrongRootsScope |
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134 false, // not scavenging. |
| 342 | 135 SharedHeap::SO_SystemClasses, |
| 136 &GenMarkSweep::follow_root_closure, | |
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137 &GenMarkSweep::follow_code_root_closure, |
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138 &GenMarkSweep::follow_klass_closure); |
| 342 | 139 |
| 140 // Process reference objects found during marking | |
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141 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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142 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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143 |
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144 rp->setup_policy(clear_all_softrefs); |
| 10405 | 145 const ReferenceProcessorStats& stats = |
| 146 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
| 147 &GenMarkSweep::keep_alive, | |
| 148 &GenMarkSweep::follow_stack_closure, | |
| 149 NULL, | |
| 150 gc_timer()); | |
| 151 gc_tracer()->report_gc_reference_stats(stats); | |
| 342 | 152 |
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153 |
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154 // This is the point where the entire marking should have completed. |
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155 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
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156 |
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157 // Unload classes and purge the SystemDictionary. |
| 342 | 158 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
| 159 | |
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160 // Unload nmethods. |
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161 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
| 342 | 162 |
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163 // Prune dead klasses from subklass/sibling/implementor lists. |
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164 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
| 342 | 165 |
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166 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
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167 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
| 342 | 168 |
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169 if (VerifyDuringGC) { |
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170 HandleMark hm; // handle scope |
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171 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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172 Universe::heap()->prepare_for_verify(); |
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173 // Note: we can verify only the heap here. When an object is |
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174 // marked, the previous value of the mark word (including |
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175 // identity hash values, ages, etc) is preserved, and the mark |
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176 // word is set to markOop::marked_value - effectively removing |
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177 // any hash values from the mark word. These hash values are |
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178 // used when verifying the dictionaries and so removing them |
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179 // from the mark word can make verification of the dictionaries |
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180 // fail. At the end of the GC, the orginal mark word values |
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181 // (including hash values) are restored to the appropriate |
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182 // objects. |
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183 if (!VerifySilently) { |
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184 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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185 } |
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186 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
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187 if (!VerifySilently) { |
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188 gclog_or_tty->print_cr("]"); |
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189 } |
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190 } |
| 10405 | 191 |
| 192 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
| 342 | 193 } |
| 194 | |
| 195 class G1PrepareCompactClosure: public HeapRegionClosure { | |
| 2152 | 196 G1CollectedHeap* _g1h; |
| 342 | 197 ModRefBarrierSet* _mrbs; |
| 198 CompactPoint _cp; | |
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199 HeapRegionSetCount _humongous_regions_removed; |
| 342 | 200 |
| 201 void free_humongous_region(HeapRegion* hr) { | |
| 202 HeapWord* end = hr->end(); | |
| 2361 | 203 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); |
| 204 | |
| 342 | 205 assert(hr->startsHumongous(), |
| 206 "Only the start of a humongous region should be freed."); | |
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207 |
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208 hr->set_containing_set(NULL); |
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209 _humongous_regions_removed.increment(1u, hr->capacity()); |
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210 |
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211 _g1h->free_humongous_region(hr, &dummy_free_list, false /* par */); |
| 342 | 212 hr->prepare_for_compaction(&_cp); |
| 213 // Also clear the part of the card table that will be unused after | |
| 214 // compaction. | |
| 2152 | 215 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
| 2361 | 216 dummy_free_list.remove_all(); |
| 342 | 217 } |
| 218 | |
| 219 public: | |
| 2152 | 220 G1PrepareCompactClosure(CompactibleSpace* cs) |
| 221 : _g1h(G1CollectedHeap::heap()), | |
| 12343 | 222 _mrbs(_g1h->g1_barrier_set()), |
| 342 | 223 _cp(NULL, cs, cs->initialize_threshold()), |
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224 _humongous_regions_removed() { } |
| 2152 | 225 |
| 226 void update_sets() { | |
| 227 // We'll recalculate total used bytes and recreate the free list | |
| 228 // at the end of the GC, so no point in updating those values here. | |
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229 HeapRegionSetCount empty_set; |
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230 _g1h->remove_from_old_sets(empty_set, _humongous_regions_removed); |
| 2152 | 231 } |
| 232 | |
| 342 | 233 bool doHeapRegion(HeapRegion* hr) { |
| 234 if (hr->isHumongous()) { | |
| 235 if (hr->startsHumongous()) { | |
| 236 oop obj = oop(hr->bottom()); | |
| 237 if (obj->is_gc_marked()) { | |
| 238 obj->forward_to(obj); | |
| 239 } else { | |
| 240 free_humongous_region(hr); | |
| 241 } | |
| 242 } else { | |
| 243 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 244 } | |
| 245 } else { | |
| 246 hr->prepare_for_compaction(&_cp); | |
| 247 // Also clear the part of the card table that will be unused after | |
| 248 // compaction. | |
| 249 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
| 250 } | |
| 251 return false; | |
| 252 } | |
| 253 }; | |
| 677 | 254 |
| 342 | 255 void G1MarkSweep::mark_sweep_phase2() { |
| 256 // Now all live objects are marked, compute the new object addresses. | |
| 257 | |
| 258 // It is not required that we traverse spaces in the same order in | |
| 259 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 260 // tracking expects us to do so. See comment under phase4. | |
| 261 | |
| 262 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 263 | |
| 10405 | 264 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer()); |
| 342 | 265 GenMarkSweep::trace("2"); |
| 266 | |
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267 // find the first region |
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268 HeapRegion* r = g1h->region_at(0); |
| 342 | 269 CompactibleSpace* sp = r; |
| 270 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
| 271 sp = r->next_compaction_space(); | |
| 272 } | |
| 273 | |
| 677 | 274 G1PrepareCompactClosure blk(sp); |
| 342 | 275 g1h->heap_region_iterate(&blk); |
| 2152 | 276 blk.update_sets(); |
| 342 | 277 } |
| 278 | |
| 279 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 280 public: | |
| 281 bool doHeapRegion(HeapRegion* r) { | |
| 282 if (r->isHumongous()) { | |
| 283 if (r->startsHumongous()) { | |
| 284 // We must adjust the pointers on the single H object. | |
| 285 oop obj = oop(r->bottom()); | |
| 286 // point all the oops to the new location | |
| 287 obj->adjust_pointers(); | |
| 288 } | |
| 289 } else { | |
| 290 // This really ought to be "as_CompactibleSpace"... | |
| 291 r->adjust_pointers(); | |
| 292 } | |
| 293 return false; | |
| 294 } | |
| 295 }; | |
| 296 | |
| 297 void G1MarkSweep::mark_sweep_phase3() { | |
| 298 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 299 | |
| 300 // Adjust the pointers to reflect the new locations | |
| 10405 | 301 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer()); |
| 342 | 302 GenMarkSweep::trace("3"); |
| 303 | |
| 304 SharedHeap* sh = SharedHeap::heap(); | |
| 305 | |
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306 // Need cleared claim bits for the strong roots processing |
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307 ClassLoaderDataGraph::clear_claimed_marks(); |
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308 |
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309 sh->process_strong_roots(true, // activate StrongRootsScope |
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310 false, // not scavenging. |
| 342 | 311 SharedHeap::SO_AllClasses, |
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312 &GenMarkSweep::adjust_pointer_closure, |
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313 NULL, // do not touch code cache here |
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314 &GenMarkSweep::adjust_klass_closure); |
| 342 | 315 |
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316 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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317 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
| 342 | 318 |
| 319 // Now adjust pointers in remaining weak roots. (All of which should | |
| 320 // have been cleared if they pointed to non-surviving objects.) | |
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321 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_pointer_closure); |
| 342 | 322 |
| 323 GenMarkSweep::adjust_marks(); | |
| 324 | |
| 325 G1AdjustPointersClosure blk; | |
| 326 g1h->heap_region_iterate(&blk); | |
| 327 } | |
| 328 | |
| 329 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 330 public: | |
| 331 G1SpaceCompactClosure() {} | |
| 332 | |
| 333 bool doHeapRegion(HeapRegion* hr) { | |
| 334 if (hr->isHumongous()) { | |
| 335 if (hr->startsHumongous()) { | |
| 336 oop obj = oop(hr->bottom()); | |
| 337 if (obj->is_gc_marked()) { | |
| 338 obj->init_mark(); | |
| 339 } else { | |
| 340 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 341 } | |
| 342 hr->reset_during_compaction(); | |
| 343 } | |
| 344 } else { | |
| 345 hr->compact(); | |
| 346 } | |
| 347 return false; | |
| 348 } | |
| 349 }; | |
| 350 | |
| 351 void G1MarkSweep::mark_sweep_phase4() { | |
| 352 // All pointers are now adjusted, move objects accordingly | |
| 353 | |
| 354 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 355 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
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356 // here (code and comment not fixed for perm removal), so we tell the validate code |
| 342 | 357 // to use a higher index (saved from phase2) when verifying perm_gen. |
| 358 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 359 | |
| 10405 | 360 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer()); |
| 342 | 361 GenMarkSweep::trace("4"); |
| 362 | |
| 363 G1SpaceCompactClosure blk; | |
| 364 g1h->heap_region_iterate(&blk); | |
| 365 | |
| 366 } |