Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 22298:c28cb37b2e1d
Rename JVMCI to INCLUDE_JVMCI.
| author | twisti |
|---|---|
| date | Wed, 22 Jul 2015 08:56:03 -0700 |
| parents | d86b226e331a |
| children | dd9cc155639c |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 17764 | 2 * Copyright (c) 2001, 2014, 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" |
| 17764 | 34 #include "gc_implementation/g1/g1StringDedup.hpp" |
| 10405 | 35 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 36 #include "gc_implementation/shared/gcTimer.hpp" | |
| 37 #include "gc_implementation/shared/gcTrace.hpp" | |
| 38 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 1972 | 39 #include "memory/gcLocker.hpp" |
| 40 #include "memory/genCollectedHeap.hpp" | |
| 41 #include "memory/modRefBarrierSet.hpp" | |
| 42 #include "memory/referencePolicy.hpp" | |
| 43 #include "memory/space.hpp" | |
| 44 #include "oops/instanceRefKlass.hpp" | |
| 45 #include "oops/oop.inline.hpp" | |
| 46 #include "prims/jvmtiExport.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/fprofiler.hpp" | |
| 49 #include "runtime/synchronizer.hpp" | |
| 50 #include "runtime/thread.hpp" | |
| 51 #include "runtime/vmThread.hpp" | |
| 52 #include "utilities/copy.hpp" | |
| 53 #include "utilities/events.hpp" | |
| 342 | 54 |
| 55 class HeapRegion; | |
| 56 | |
| 57 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
| 58 bool clear_all_softrefs) { | |
| 59 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 60 | |
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61 SharedHeap* sh = SharedHeap::heap(); |
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62 #ifdef ASSERT |
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63 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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64 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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65 } |
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66 #endif |
| 342 | 67 // hook up weak ref data so it can be used during Mark-Sweep |
| 68 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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69 assert(rp != NULL, "should be non-NULL"); |
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70 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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71 |
| 342 | 72 GenMarkSweep::_ref_processor = rp; |
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73 rp->setup_policy(clear_all_softrefs); |
| 342 | 74 |
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75 // When collecting the permanent generation Method*s may be moving, |
| 342 | 76 // so we either have to flush all bcp data or convert it into bci. |
| 77 CodeCache::gc_prologue(); | |
| 78 Threads::gc_prologue(); | |
| 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 | |
| 22298 | 92 #if defined(COMPILER2) || INCLUDE_JVMCI |
| 342 | 93 // Don't add any more derived pointers during phase3 |
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94 DerivedPointerTable::set_active(false); |
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95 #endif |
| 342 | 96 |
| 97 mark_sweep_phase3(); | |
| 98 | |
| 99 mark_sweep_phase4(); | |
| 100 | |
| 101 GenMarkSweep::restore_marks(); | |
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102 BiasedLocking::restore_marks(); |
| 342 | 103 GenMarkSweep::deallocate_stacks(); |
| 104 | |
| 105 // "free at last gc" is calculated from these. | |
| 106 // CHF: cheating for now!!! | |
| 107 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
| 108 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
| 109 | |
| 110 Threads::gc_epilogue(); | |
| 111 CodeCache::gc_epilogue(); | |
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112 JvmtiExport::gc_epilogue(); |
| 342 | 113 |
| 114 // refs processing: clean slate | |
| 115 GenMarkSweep::_ref_processor = NULL; | |
| 116 } | |
| 117 | |
| 118 | |
| 119 void G1MarkSweep::allocate_stacks() { | |
| 120 GenMarkSweep::_preserved_count_max = 0; | |
| 121 GenMarkSweep::_preserved_marks = NULL; | |
| 122 GenMarkSweep::_preserved_count = 0; | |
| 123 } | |
| 124 | |
| 125 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 126 bool clear_all_softrefs) { | |
| 127 // Recursively traverse all live objects and mark them | |
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128 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 129 GenMarkSweep::trace(" 1"); |
| 130 | |
| 131 SharedHeap* sh = SharedHeap::heap(); | |
| 132 | |
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133 // Need cleared claim bits for the roots processing |
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134 ClassLoaderDataGraph::clear_claimed_marks(); |
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135 |
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136 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations); |
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137 sh->process_strong_roots(true, // activate StrongRootsScope |
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138 SharedHeap::SO_None, |
| 342 | 139 &GenMarkSweep::follow_root_closure, |
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140 &GenMarkSweep::follow_cld_closure, |
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141 &follow_code_closure); |
| 342 | 142 |
| 143 // Process reference objects found during marking | |
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144 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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145 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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146 |
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147 rp->setup_policy(clear_all_softrefs); |
| 10405 | 148 const ReferenceProcessorStats& stats = |
| 149 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
| 150 &GenMarkSweep::keep_alive, | |
| 151 &GenMarkSweep::follow_stack_closure, | |
| 152 NULL, | |
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153 gc_timer(), |
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154 gc_tracer()->gc_id()); |
| 10405 | 155 gc_tracer()->report_gc_reference_stats(stats); |
| 342 | 156 |
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157 |
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158 // This is the point where the entire marking should have completed. |
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159 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
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160 |
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161 // Unload classes and purge the SystemDictionary. |
| 342 | 162 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
| 163 | |
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164 // Unload nmethods. |
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165 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
| 342 | 166 |
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167 // Prune dead klasses from subklass/sibling/implementor lists. |
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168 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
| 342 | 169 |
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170 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
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171 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
| 342 | 172 |
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173 if (VerifyDuringGC) { |
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174 HandleMark hm; // handle scope |
| 22298 | 175 #if defined(COMPILER2) || INCLUDE_JVMCI |
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176 DerivedPointerTableDeactivate dpt_deact; |
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177 #endif |
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178 Universe::heap()->prepare_for_verify(); |
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179 // Note: we can verify only the heap here. When an object is |
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180 // marked, the previous value of the mark word (including |
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181 // identity hash values, ages, etc) is preserved, and the mark |
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182 // word is set to markOop::marked_value - effectively removing |
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183 // any hash values from the mark word. These hash values are |
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184 // used when verifying the dictionaries and so removing them |
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185 // from the mark word can make verification of the dictionaries |
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186 // fail. At the end of the GC, the orginal mark word values |
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187 // (including hash values) are restored to the appropriate |
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188 // objects. |
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189 if (!VerifySilently) { |
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190 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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191 } |
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192 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
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193 if (!VerifySilently) { |
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194 gclog_or_tty->print_cr("]"); |
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195 } |
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196 } |
| 10405 | 197 |
| 198 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
| 342 | 199 } |
| 200 | |
| 677 | 201 |
| 342 | 202 void G1MarkSweep::mark_sweep_phase2() { |
| 203 // Now all live objects are marked, compute the new object addresses. | |
| 204 | |
| 205 // It is not required that we traverse spaces in the same order in | |
| 206 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 207 // tracking expects us to do so. See comment under phase4. | |
| 208 | |
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209 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 210 GenMarkSweep::trace("2"); |
| 211 | |
| 20417 | 212 prepare_compaction(); |
| 342 | 213 } |
| 214 | |
| 215 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 216 public: | |
| 217 bool doHeapRegion(HeapRegion* r) { | |
| 218 if (r->isHumongous()) { | |
| 219 if (r->startsHumongous()) { | |
| 220 // We must adjust the pointers on the single H object. | |
| 221 oop obj = oop(r->bottom()); | |
| 222 // point all the oops to the new location | |
| 223 obj->adjust_pointers(); | |
| 224 } | |
| 225 } else { | |
| 226 // This really ought to be "as_CompactibleSpace"... | |
| 227 r->adjust_pointers(); | |
| 228 } | |
| 229 return false; | |
| 230 } | |
| 231 }; | |
| 232 | |
| 233 void G1MarkSweep::mark_sweep_phase3() { | |
| 234 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 235 | |
| 236 // Adjust the pointers to reflect the new locations | |
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237 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 238 GenMarkSweep::trace("3"); |
| 239 | |
| 240 SharedHeap* sh = SharedHeap::heap(); | |
| 241 | |
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242 // Need cleared claim bits for the roots processing |
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243 ClassLoaderDataGraph::clear_claimed_marks(); |
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244 |
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245 CodeBlobToOopClosure adjust_code_closure(&GenMarkSweep::adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations); |
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246 sh->process_all_roots(true, // activate StrongRootsScope |
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247 SharedHeap::SO_AllCodeCache, |
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248 &GenMarkSweep::adjust_pointer_closure, |
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249 &GenMarkSweep::adjust_cld_closure, |
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250 &adjust_code_closure); |
| 342 | 251 |
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252 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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253 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
| 342 | 254 |
| 255 // Now adjust pointers in remaining weak roots. (All of which should | |
| 256 // have been cleared if they pointed to non-surviving objects.) | |
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257 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure); |
| 342 | 258 |
| 17764 | 259 if (G1StringDedup::is_enabled()) { |
| 260 G1StringDedup::oops_do(&GenMarkSweep::adjust_pointer_closure); | |
| 261 } | |
| 262 | |
| 342 | 263 GenMarkSweep::adjust_marks(); |
| 264 | |
| 265 G1AdjustPointersClosure blk; | |
| 266 g1h->heap_region_iterate(&blk); | |
| 267 } | |
| 268 | |
| 269 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 270 public: | |
| 271 G1SpaceCompactClosure() {} | |
| 272 | |
| 273 bool doHeapRegion(HeapRegion* hr) { | |
| 274 if (hr->isHumongous()) { | |
| 275 if (hr->startsHumongous()) { | |
| 276 oop obj = oop(hr->bottom()); | |
| 277 if (obj->is_gc_marked()) { | |
| 278 obj->init_mark(); | |
| 279 } else { | |
| 280 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 281 } | |
| 282 hr->reset_during_compaction(); | |
| 283 } | |
| 284 } else { | |
| 285 hr->compact(); | |
| 286 } | |
| 287 return false; | |
| 288 } | |
| 289 }; | |
| 290 | |
| 291 void G1MarkSweep::mark_sweep_phase4() { | |
| 292 // All pointers are now adjusted, move objects accordingly | |
| 293 | |
| 294 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 295 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
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296 // here (code and comment not fixed for perm removal), so we tell the validate code |
| 342 | 297 // to use a higher index (saved from phase2) when verifying perm_gen. |
| 298 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 299 | |
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300 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 301 GenMarkSweep::trace("4"); |
| 302 | |
| 303 G1SpaceCompactClosure blk; | |
| 304 g1h->heap_region_iterate(&blk); | |
| 305 | |
| 306 } | |
| 20417 | 307 |
| 308 void G1MarkSweep::prepare_compaction_work(G1PrepareCompactClosure* blk) { | |
| 309 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 310 g1h->heap_region_iterate(blk); | |
| 311 blk->update_sets(); | |
| 312 } | |
| 313 | |
| 314 void G1PrepareCompactClosure::free_humongous_region(HeapRegion* hr) { | |
| 315 HeapWord* end = hr->end(); | |
| 316 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
| 317 | |
| 318 assert(hr->startsHumongous(), | |
| 319 "Only the start of a humongous region should be freed."); | |
| 320 | |
| 321 hr->set_containing_set(NULL); | |
| 322 _humongous_regions_removed.increment(1u, hr->capacity()); | |
| 323 | |
| 324 _g1h->free_humongous_region(hr, &dummy_free_list, false /* par */); | |
| 325 prepare_for_compaction(hr, end); | |
| 326 dummy_free_list.remove_all(); | |
| 327 } | |
| 328 | |
| 329 void G1PrepareCompactClosure::prepare_for_compaction(HeapRegion* hr, HeapWord* end) { | |
| 330 // If this is the first live region that we came across which we can compact, | |
| 331 // initialize the CompactPoint. | |
| 332 if (!is_cp_initialized()) { | |
| 333 _cp.space = hr; | |
| 334 _cp.threshold = hr->initialize_threshold(); | |
| 335 } | |
| 336 prepare_for_compaction_work(&_cp, hr, end); | |
| 337 } | |
| 338 | |
| 339 void G1PrepareCompactClosure::prepare_for_compaction_work(CompactPoint* cp, | |
| 340 HeapRegion* hr, | |
| 341 HeapWord* end) { | |
| 342 hr->prepare_for_compaction(cp); | |
| 343 // Also clear the part of the card table that will be unused after | |
| 344 // compaction. | |
| 345 _mrbs->clear(MemRegion(hr->compaction_top(), end)); | |
| 346 } | |
| 347 | |
| 348 void G1PrepareCompactClosure::update_sets() { | |
| 349 // We'll recalculate total used bytes and recreate the free list | |
| 350 // at the end of the GC, so no point in updating those values here. | |
| 351 HeapRegionSetCount empty_set; | |
| 352 _g1h->remove_from_old_sets(empty_set, _humongous_regions_removed); | |
| 353 } | |
| 354 | |
| 355 bool G1PrepareCompactClosure::doHeapRegion(HeapRegion* hr) { | |
| 356 if (hr->isHumongous()) { | |
| 357 if (hr->startsHumongous()) { | |
| 358 oop obj = oop(hr->bottom()); | |
| 359 if (obj->is_gc_marked()) { | |
| 360 obj->forward_to(obj); | |
| 361 } else { | |
| 362 free_humongous_region(hr); | |
| 363 } | |
| 364 } else { | |
| 365 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 366 } | |
| 367 } else { | |
| 368 prepare_for_compaction(hr, hr->end()); | |
| 369 } | |
| 370 return false; | |
| 371 } |