Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 6254:a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
Summary: Various cleanups as a prelude to introducing iterators for HeapRegions.
Reviewed-by: johnc, brutisso
| author | tonyp |
|---|---|
| date | Thu, 19 Jul 2012 15:15:54 -0700 |
| parents | b632e80fc9dc |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" |
| 34 #include "memory/gcLocker.hpp" | |
| 35 #include "memory/genCollectedHeap.hpp" | |
| 36 #include "memory/modRefBarrierSet.hpp" | |
| 37 #include "memory/referencePolicy.hpp" | |
| 38 #include "memory/space.hpp" | |
| 39 #include "oops/instanceRefKlass.hpp" | |
| 40 #include "oops/oop.inline.hpp" | |
| 41 #include "prims/jvmtiExport.hpp" | |
| 42 #include "runtime/aprofiler.hpp" | |
| 43 #include "runtime/biasedLocking.hpp" | |
| 44 #include "runtime/fprofiler.hpp" | |
| 45 #include "runtime/synchronizer.hpp" | |
| 46 #include "runtime/thread.hpp" | |
| 47 #include "runtime/vmThread.hpp" | |
| 48 #include "utilities/copy.hpp" | |
| 49 #include "utilities/events.hpp" | |
| 342 | 50 |
| 51 class HeapRegion; | |
| 52 | |
| 53 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
| 54 bool clear_all_softrefs) { | |
| 55 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 56 | |
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57 SharedHeap* sh = SharedHeap::heap(); |
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58 #ifdef ASSERT |
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59 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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60 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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61 } |
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62 #endif |
| 342 | 63 // hook up weak ref data so it can be used during Mark-Sweep |
| 64 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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65 assert(rp != NULL, "should be non-NULL"); |
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66 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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67 |
| 342 | 68 GenMarkSweep::_ref_processor = rp; |
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69 rp->setup_policy(clear_all_softrefs); |
| 342 | 70 |
| 71 // When collecting the permanent generation methodOops may be moving, | |
| 72 // so we either have to flush all bcp data or convert it into bci. | |
| 73 CodeCache::gc_prologue(); | |
| 74 Threads::gc_prologue(); | |
| 75 | |
| 76 // Increment the invocation count for the permanent generation, since it is | |
| 77 // implicitly collected whenever we do a full mark sweep collection. | |
| 78 sh->perm_gen()->stat_record()->invocations++; | |
| 79 | |
| 80 bool marked_for_unloading = false; | |
| 81 | |
| 82 allocate_stacks(); | |
| 83 | |
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84 // We should save the marks of the currently locked biased monitors. |
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85 // The marking doesn't preserve the marks of biased objects. |
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86 BiasedLocking::preserve_marks(); |
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87 |
| 342 | 88 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
| 89 | |
| 90 mark_sweep_phase2(); | |
| 91 | |
| 92 // Don't add any more derived pointers during phase3 | |
| 93 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 94 | |
| 95 mark_sweep_phase3(); | |
| 96 | |
| 97 mark_sweep_phase4(); | |
| 98 | |
| 99 GenMarkSweep::restore_marks(); | |
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100 BiasedLocking::restore_marks(); |
| 342 | 101 GenMarkSweep::deallocate_stacks(); |
| 102 | |
| 103 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
| 104 GenRemSet* rs = sh->rem_set(); | |
| 105 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
| 106 | |
| 107 // "free at last gc" is calculated from these. | |
| 108 // CHF: cheating for now!!! | |
| 109 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
| 110 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
| 111 | |
| 112 Threads::gc_epilogue(); | |
| 113 CodeCache::gc_epilogue(); | |
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114 JvmtiExport::gc_epilogue(); |
| 342 | 115 |
| 116 // refs processing: clean slate | |
| 117 GenMarkSweep::_ref_processor = NULL; | |
| 118 } | |
| 119 | |
| 120 | |
| 121 void G1MarkSweep::allocate_stacks() { | |
| 122 GenMarkSweep::_preserved_count_max = 0; | |
| 123 GenMarkSweep::_preserved_marks = NULL; | |
| 124 GenMarkSweep::_preserved_count = 0; | |
| 125 } | |
| 126 | |
| 127 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 128 bool clear_all_softrefs) { | |
| 129 // Recursively traverse all live objects and mark them | |
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130 TraceTime tm("phase 1", G1Log::fine() && Verbose, true, gclog_or_tty); |
| 342 | 131 GenMarkSweep::trace(" 1"); |
| 132 | |
| 133 SharedHeap* sh = SharedHeap::heap(); | |
| 134 | |
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135 sh->process_strong_roots(true, // activeate StrongRootsScope |
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136 true, // Collecting permanent generation. |
| 342 | 137 SharedHeap::SO_SystemClasses, |
| 138 &GenMarkSweep::follow_root_closure, | |
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139 &GenMarkSweep::follow_code_root_closure, |
| 342 | 140 &GenMarkSweep::follow_root_closure); |
| 141 | |
| 142 // Process reference objects found during marking | |
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143 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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144 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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145 |
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146 rp->setup_policy(clear_all_softrefs); |
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147 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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148 &GenMarkSweep::keep_alive, |
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149 &GenMarkSweep::follow_stack_closure, |
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150 NULL); |
| 342 | 151 |
| 152 // Follow system dictionary roots and unload classes | |
| 153 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
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154 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 155 "stack should be empty by now"); |
| 156 | |
| 157 // Follow code cache roots (has to be done after system dictionary, | |
| 158 // assumes all live klasses are marked) | |
| 159 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
| 160 &GenMarkSweep::keep_alive, | |
| 161 purged_class); | |
| 941 | 162 GenMarkSweep::follow_stack(); |
| 342 | 163 |
| 164 // Update subklass/sibling/implementor links of live klasses | |
| 165 GenMarkSweep::follow_weak_klass_links(); | |
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166 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 167 "stack should be empty by now"); |
| 168 | |
| 941 | 169 // Visit memoized MDO's and clear any unmarked weak refs |
| 170 GenMarkSweep::follow_mdo_weak_refs(); | |
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171 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained"); |
| 941 | 172 |
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173 // Visit interned string tables and delete unmarked oops |
| 342 | 174 StringTable::unlink(&GenMarkSweep::is_alive); |
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175 // Clean up unreferenced symbols in symbol table. |
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176 SymbolTable::unlink(); |
| 342 | 177 |
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178 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 179 "stack should be empty by now"); |
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180 |
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181 if (VerifyDuringGC) { |
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182 HandleMark hm; // handle scope |
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183 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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184 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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185 Universe::heap()->prepare_for_verify(); |
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186 // Note: we can verify only the heap here. When an object is |
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187 // marked, the previous value of the mark word (including |
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188 // identity hash values, ages, etc) is preserved, and the mark |
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189 // word is set to markOop::marked_value - effectively removing |
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190 // any hash values from the mark word. These hash values are |
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191 // used when verifying the dictionaries and so removing them |
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192 // from the mark word can make verification of the dictionaries |
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193 // fail. At the end of the GC, the orginal mark word values |
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194 // (including hash values) are restored to the appropriate |
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195 // objects. |
| 6008 | 196 Universe::heap()->verify(/* silent */ false, |
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197 /* option */ VerifyOption_G1UseMarkWord); |
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198 |
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199 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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200 gclog_or_tty->print_cr("]"); |
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201 } |
| 342 | 202 } |
| 203 | |
| 204 class G1PrepareCompactClosure: public HeapRegionClosure { | |
| 2152 | 205 G1CollectedHeap* _g1h; |
| 342 | 206 ModRefBarrierSet* _mrbs; |
| 207 CompactPoint _cp; | |
| 2152 | 208 HumongousRegionSet _humongous_proxy_set; |
| 342 | 209 |
| 210 void free_humongous_region(HeapRegion* hr) { | |
| 211 HeapWord* end = hr->end(); | |
| 2361 | 212 size_t dummy_pre_used; |
| 213 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
| 214 | |
| 342 | 215 assert(hr->startsHumongous(), |
| 216 "Only the start of a humongous region should be freed."); | |
| 2361 | 217 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
| 2152 | 218 &_humongous_proxy_set, false /* par */); |
| 342 | 219 hr->prepare_for_compaction(&_cp); |
| 220 // Also clear the part of the card table that will be unused after | |
| 221 // compaction. | |
| 2152 | 222 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
| 2361 | 223 dummy_free_list.remove_all(); |
| 342 | 224 } |
| 225 | |
| 226 public: | |
| 2152 | 227 G1PrepareCompactClosure(CompactibleSpace* cs) |
| 228 : _g1h(G1CollectedHeap::heap()), | |
| 229 _mrbs(G1CollectedHeap::heap()->mr_bs()), | |
| 342 | 230 _cp(NULL, cs, cs->initialize_threshold()), |
| 2152 | 231 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
| 232 | |
| 233 void update_sets() { | |
| 234 // We'll recalculate total used bytes and recreate the free list | |
| 235 // at the end of the GC, so no point in updating those values here. | |
| 236 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
| 237 NULL, /* free_list */ | |
| 4072 | 238 NULL, /* old_proxy_set */ |
| 2152 | 239 &_humongous_proxy_set, |
| 240 false /* par */); | |
| 241 } | |
| 242 | |
| 342 | 243 bool doHeapRegion(HeapRegion* hr) { |
| 244 if (hr->isHumongous()) { | |
| 245 if (hr->startsHumongous()) { | |
| 246 oop obj = oop(hr->bottom()); | |
| 247 if (obj->is_gc_marked()) { | |
| 248 obj->forward_to(obj); | |
| 249 } else { | |
| 250 free_humongous_region(hr); | |
| 251 } | |
| 252 } else { | |
| 253 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 254 } | |
| 255 } else { | |
| 256 hr->prepare_for_compaction(&_cp); | |
| 257 // Also clear the part of the card table that will be unused after | |
| 258 // compaction. | |
| 259 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
| 260 } | |
| 261 return false; | |
| 262 } | |
| 263 }; | |
| 677 | 264 |
| 342 | 265 void G1MarkSweep::mark_sweep_phase2() { |
| 266 // Now all live objects are marked, compute the new object addresses. | |
| 267 | |
| 268 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 269 // allowed a range of dead object may get overwritten by a dead int | |
| 270 // array. If perm_gen is not traversed last a klassOop may get | |
| 271 // overwritten. This is fine since it is dead, but if the class has dead | |
| 272 // instances we have to skip them, and in order to find their size we | |
| 273 // need the klassOop! | |
| 274 // | |
| 275 // It is not required that we traverse spaces in the same order in | |
| 276 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 277 // tracking expects us to do so. See comment under phase4. | |
| 278 | |
| 279 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 280 Generation* pg = g1h->perm_gen(); | |
| 281 | |
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282 TraceTime tm("phase 2", G1Log::fine() && Verbose, true, gclog_or_tty); |
| 342 | 283 GenMarkSweep::trace("2"); |
| 284 | |
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285 // find the first region |
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286 HeapRegion* r = g1h->region_at(0); |
| 342 | 287 CompactibleSpace* sp = r; |
| 288 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
| 289 sp = r->next_compaction_space(); | |
| 290 } | |
| 291 | |
| 677 | 292 G1PrepareCompactClosure blk(sp); |
| 342 | 293 g1h->heap_region_iterate(&blk); |
| 2152 | 294 blk.update_sets(); |
| 342 | 295 |
| 296 CompactPoint perm_cp(pg, NULL, NULL); | |
| 297 pg->prepare_for_compaction(&perm_cp); | |
| 298 } | |
| 299 | |
| 300 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 301 public: | |
| 302 bool doHeapRegion(HeapRegion* r) { | |
| 303 if (r->isHumongous()) { | |
| 304 if (r->startsHumongous()) { | |
| 305 // We must adjust the pointers on the single H object. | |
| 306 oop obj = oop(r->bottom()); | |
| 307 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
| 308 // point all the oops to the new location | |
| 309 obj->adjust_pointers(); | |
| 310 debug_only(GenMarkSweep::check_interior_pointers()); | |
| 311 } | |
| 312 } else { | |
| 313 // This really ought to be "as_CompactibleSpace"... | |
| 314 r->adjust_pointers(); | |
| 315 } | |
| 316 return false; | |
| 317 } | |
| 318 }; | |
| 319 | |
| 320 void G1MarkSweep::mark_sweep_phase3() { | |
| 321 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 322 Generation* pg = g1h->perm_gen(); | |
| 323 | |
| 324 // Adjust the pointers to reflect the new locations | |
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7160728: Introduce an extra logging level for G1 logging
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325 TraceTime tm("phase 3", G1Log::fine() && Verbose, true, gclog_or_tty); |
| 342 | 326 GenMarkSweep::trace("3"); |
| 327 | |
| 328 SharedHeap* sh = SharedHeap::heap(); | |
| 329 | |
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6863023: need non-perm oops in code cache for JSR 292
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330 sh->process_strong_roots(true, // activate StrongRootsScope |
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331 true, // Collecting permanent generation. |
| 342 | 332 SharedHeap::SO_AllClasses, |
| 333 &GenMarkSweep::adjust_root_pointer_closure, | |
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334 NULL, // do not touch code cache here |
| 342 | 335 &GenMarkSweep::adjust_pointer_closure); |
| 336 | |
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6484982: G1: process references during evacuation pauses
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337 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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6484982: G1: process references during evacuation pauses
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338 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); |
| 342 | 339 |
| 340 // Now adjust pointers in remaining weak roots. (All of which should | |
| 341 // have been cleared if they pointed to non-surviving objects.) | |
| 342 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
| 343 &GenMarkSweep::adjust_pointer_closure); | |
| 344 | |
| 345 GenMarkSweep::adjust_marks(); | |
| 346 | |
| 347 G1AdjustPointersClosure blk; | |
| 348 g1h->heap_region_iterate(&blk); | |
| 349 pg->adjust_pointers(); | |
| 350 } | |
| 351 | |
| 352 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 353 public: | |
| 354 G1SpaceCompactClosure() {} | |
| 355 | |
| 356 bool doHeapRegion(HeapRegion* hr) { | |
| 357 if (hr->isHumongous()) { | |
| 358 if (hr->startsHumongous()) { | |
| 359 oop obj = oop(hr->bottom()); | |
| 360 if (obj->is_gc_marked()) { | |
| 361 obj->init_mark(); | |
| 362 } else { | |
| 363 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 364 } | |
| 365 hr->reset_during_compaction(); | |
| 366 } | |
| 367 } else { | |
| 368 hr->compact(); | |
| 369 } | |
| 370 return false; | |
| 371 } | |
| 372 }; | |
| 373 | |
| 374 void G1MarkSweep::mark_sweep_phase4() { | |
| 375 // All pointers are now adjusted, move objects accordingly | |
| 376 | |
| 377 // It is imperative that we traverse perm_gen first in phase4. All | |
| 378 // classes must be allocated earlier than their instances, and traversing | |
| 379 // perm_gen first makes sure that all klassOops have moved to their new | |
| 380 // location before any instance does a dispatch through it's klass! | |
| 381 | |
| 382 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 383 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
| 384 // here (perm_gen first rather than last), so we tell the validate code | |
| 385 // to use a higher index (saved from phase2) when verifying perm_gen. | |
| 386 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 387 Generation* pg = g1h->perm_gen(); | |
| 388 | |
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7160728: Introduce an extra logging level for G1 logging
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diff
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389 TraceTime tm("phase 4", G1Log::fine() && Verbose, true, gclog_or_tty); |
| 342 | 390 GenMarkSweep::trace("4"); |
| 391 | |
| 392 pg->compact(); | |
| 393 | |
| 394 G1SpaceCompactClosure blk; | |
| 395 g1h->heap_region_iterate(&blk); | |
| 396 | |
| 397 } |