Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 23286:dd9cc155639c
Merge with jdk8u66-b17
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Thu, 07 Jan 2016 17:28:46 +0100 |
| parents | c28cb37b2e1d 38d6febe66af |
| children |
| 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" |
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34 #include "gc_implementation/g1/g1RootProcessor.hpp" |
| 17764 | 35 #include "gc_implementation/g1/g1StringDedup.hpp" |
| 10405 | 36 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 37 #include "gc_implementation/shared/gcTimer.hpp" | |
| 38 #include "gc_implementation/shared/gcTrace.hpp" | |
| 39 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 1972 | 40 #include "memory/gcLocker.hpp" |
| 41 #include "memory/genCollectedHeap.hpp" | |
| 42 #include "memory/modRefBarrierSet.hpp" | |
| 43 #include "memory/referencePolicy.hpp" | |
| 44 #include "memory/space.hpp" | |
| 45 #include "oops/instanceRefKlass.hpp" | |
| 46 #include "oops/oop.inline.hpp" | |
| 47 #include "prims/jvmtiExport.hpp" | |
| 48 #include "runtime/biasedLocking.hpp" | |
| 49 #include "runtime/fprofiler.hpp" | |
| 50 #include "runtime/synchronizer.hpp" | |
| 51 #include "runtime/thread.hpp" | |
| 52 #include "runtime/vmThread.hpp" | |
| 53 #include "utilities/copy.hpp" | |
| 54 #include "utilities/events.hpp" | |
| 342 | 55 |
| 56 class HeapRegion; | |
| 57 | |
| 58 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
| 59 bool clear_all_softrefs) { | |
| 60 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 61 | |
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62 SharedHeap* sh = SharedHeap::heap(); |
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63 #ifdef ASSERT |
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64 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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65 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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66 } |
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67 #endif |
| 342 | 68 // hook up weak ref data so it can be used during Mark-Sweep |
| 69 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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70 assert(rp != NULL, "should be non-NULL"); |
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71 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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72 |
| 342 | 73 GenMarkSweep::_ref_processor = rp; |
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74 rp->setup_policy(clear_all_softrefs); |
| 342 | 75 |
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76 // When collecting the permanent generation Method*s may be moving, |
| 342 | 77 // so we either have to flush all bcp data or convert it into bci. |
| 78 CodeCache::gc_prologue(); | |
| 79 Threads::gc_prologue(); | |
| 80 | |
| 81 bool marked_for_unloading = false; | |
| 82 | |
| 83 allocate_stacks(); | |
| 84 | |
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85 // We should save the marks of the currently locked biased monitors. |
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86 // The marking doesn't preserve the marks of biased objects. |
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87 BiasedLocking::preserve_marks(); |
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88 |
| 342 | 89 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
| 90 | |
| 91 mark_sweep_phase2(); | |
| 92 | |
| 22298 | 93 #if defined(COMPILER2) || INCLUDE_JVMCI |
| 342 | 94 // Don't add any more derived pointers during phase3 |
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95 DerivedPointerTable::set_active(false); |
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96 #endif |
| 342 | 97 |
| 98 mark_sweep_phase3(); | |
| 99 | |
| 100 mark_sweep_phase4(); | |
| 101 | |
| 102 GenMarkSweep::restore_marks(); | |
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103 BiasedLocking::restore_marks(); |
| 342 | 104 GenMarkSweep::deallocate_stacks(); |
| 105 | |
| 106 // "free at last gc" is calculated from these. | |
| 107 // CHF: cheating for now!!! | |
| 108 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
| 109 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
| 110 | |
| 111 Threads::gc_epilogue(); | |
| 112 CodeCache::gc_epilogue(); | |
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113 JvmtiExport::gc_epilogue(); |
| 342 | 114 |
| 115 // refs processing: clean slate | |
| 116 GenMarkSweep::_ref_processor = NULL; | |
| 117 } | |
| 118 | |
| 119 | |
| 120 void G1MarkSweep::allocate_stacks() { | |
| 121 GenMarkSweep::_preserved_count_max = 0; | |
| 122 GenMarkSweep::_preserved_marks = NULL; | |
| 123 GenMarkSweep::_preserved_count = 0; | |
| 124 } | |
| 125 | |
| 126 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 127 bool clear_all_softrefs) { | |
| 128 // Recursively traverse all live objects and mark them | |
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129 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 130 GenMarkSweep::trace(" 1"); |
| 131 | |
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132 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 342 | 133 |
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134 // Need cleared claim bits for the roots processing |
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135 ClassLoaderDataGraph::clear_claimed_marks(); |
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136 |
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137 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations); |
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138 { |
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139 G1RootProcessor root_processor(g1h); |
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140 root_processor.process_strong_roots(&GenMarkSweep::follow_root_closure, |
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141 &GenMarkSweep::follow_cld_closure, |
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142 &follow_code_closure); |
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143 } |
| 342 | 144 |
| 145 // Process reference objects found during marking | |
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146 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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147 assert(rp == g1h->ref_processor_stw(), "Sanity"); |
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148 |
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149 rp->setup_policy(clear_all_softrefs); |
| 10405 | 150 const ReferenceProcessorStats& stats = |
| 151 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
| 152 &GenMarkSweep::keep_alive, | |
| 153 &GenMarkSweep::follow_stack_closure, | |
| 154 NULL, | |
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155 gc_timer(), |
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156 gc_tracer()->gc_id()); |
| 10405 | 157 gc_tracer()->report_gc_reference_stats(stats); |
| 342 | 158 |
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159 |
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160 // This is the point where the entire marking should have completed. |
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161 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
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162 |
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163 // Unload classes and purge the SystemDictionary. |
| 342 | 164 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
| 165 | |
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166 // Unload nmethods. |
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167 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
| 342 | 168 |
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169 // Prune dead klasses from subklass/sibling/implementor lists. |
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170 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
| 342 | 171 |
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172 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
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173 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
| 342 | 174 |
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175 if (VerifyDuringGC) { |
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176 HandleMark hm; // handle scope |
| 22298 | 177 #if defined(COMPILER2) || INCLUDE_JVMCI |
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178 DerivedPointerTableDeactivate dpt_deact; |
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179 #endif |
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180 Universe::heap()->prepare_for_verify(); |
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181 // Note: we can verify only the heap here. When an object is |
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182 // marked, the previous value of the mark word (including |
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183 // identity hash values, ages, etc) is preserved, and the mark |
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184 // word is set to markOop::marked_value - effectively removing |
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185 // any hash values from the mark word. These hash values are |
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186 // used when verifying the dictionaries and so removing them |
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187 // from the mark word can make verification of the dictionaries |
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188 // fail. At the end of the GC, the orginal mark word values |
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189 // (including hash values) are restored to the appropriate |
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190 // objects. |
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191 if (!VerifySilently) { |
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192 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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193 } |
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194 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
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195 if (!VerifySilently) { |
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196 gclog_or_tty->print_cr("]"); |
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197 } |
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198 } |
| 10405 | 199 |
| 200 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
| 342 | 201 } |
| 202 | |
| 677 | 203 |
| 342 | 204 void G1MarkSweep::mark_sweep_phase2() { |
| 205 // Now all live objects are marked, compute the new object addresses. | |
| 206 | |
| 207 // It is not required that we traverse spaces in the same order in | |
| 208 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 209 // tracking expects us to do so. See comment under phase4. | |
| 210 | |
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211 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 212 GenMarkSweep::trace("2"); |
| 213 | |
| 20417 | 214 prepare_compaction(); |
| 342 | 215 } |
| 216 | |
| 217 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 218 public: | |
| 219 bool doHeapRegion(HeapRegion* r) { | |
| 220 if (r->isHumongous()) { | |
| 221 if (r->startsHumongous()) { | |
| 222 // We must adjust the pointers on the single H object. | |
| 223 oop obj = oop(r->bottom()); | |
| 224 // point all the oops to the new location | |
| 225 obj->adjust_pointers(); | |
| 226 } | |
| 227 } else { | |
| 228 // This really ought to be "as_CompactibleSpace"... | |
| 229 r->adjust_pointers(); | |
| 230 } | |
| 231 return false; | |
| 232 } | |
| 233 }; | |
| 234 | |
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235 class G1AlwaysTrueClosure: public BoolObjectClosure { |
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236 public: |
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237 bool do_object_b(oop p) { return true; } |
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238 }; |
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239 static G1AlwaysTrueClosure always_true; |
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240 |
| 342 | 241 void G1MarkSweep::mark_sweep_phase3() { |
| 242 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 243 | |
| 244 // Adjust the pointers to reflect the new locations | |
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245 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 246 GenMarkSweep::trace("3"); |
| 247 | |
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248 // Need cleared claim bits for the roots processing |
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249 ClassLoaderDataGraph::clear_claimed_marks(); |
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250 |
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251 CodeBlobToOopClosure adjust_code_closure(&GenMarkSweep::adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations); |
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252 { |
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253 G1RootProcessor root_processor(g1h); |
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254 root_processor.process_all_roots(&GenMarkSweep::adjust_pointer_closure, |
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255 &GenMarkSweep::adjust_cld_closure, |
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256 &adjust_code_closure); |
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257 } |
| 342 | 258 |
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259 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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260 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
| 342 | 261 |
| 262 // Now adjust pointers in remaining weak roots. (All of which should | |
| 263 // have been cleared if they pointed to non-surviving objects.) | |
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264 JNIHandles::weak_oops_do(&always_true, &GenMarkSweep::adjust_pointer_closure); |
| 342 | 265 |
| 17764 | 266 if (G1StringDedup::is_enabled()) { |
| 267 G1StringDedup::oops_do(&GenMarkSweep::adjust_pointer_closure); | |
| 268 } | |
| 269 | |
| 342 | 270 GenMarkSweep::adjust_marks(); |
| 271 | |
| 272 G1AdjustPointersClosure blk; | |
| 273 g1h->heap_region_iterate(&blk); | |
| 274 } | |
| 275 | |
| 276 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 277 public: | |
| 278 G1SpaceCompactClosure() {} | |
| 279 | |
| 280 bool doHeapRegion(HeapRegion* hr) { | |
| 281 if (hr->isHumongous()) { | |
| 282 if (hr->startsHumongous()) { | |
| 283 oop obj = oop(hr->bottom()); | |
| 284 if (obj->is_gc_marked()) { | |
| 285 obj->init_mark(); | |
| 286 } else { | |
| 287 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 288 } | |
| 289 hr->reset_during_compaction(); | |
| 290 } | |
| 291 } else { | |
| 292 hr->compact(); | |
| 293 } | |
| 294 return false; | |
| 295 } | |
| 296 }; | |
| 297 | |
| 298 void G1MarkSweep::mark_sweep_phase4() { | |
| 299 // All pointers are now adjusted, move objects accordingly | |
| 300 | |
| 301 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 302 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
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303 // here (code and comment not fixed for perm removal), so we tell the validate code |
| 342 | 304 // to use a higher index (saved from phase2) when verifying perm_gen. |
| 305 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 306 | |
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307 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
| 342 | 308 GenMarkSweep::trace("4"); |
| 309 | |
| 310 G1SpaceCompactClosure blk; | |
| 311 g1h->heap_region_iterate(&blk); | |
| 312 | |
| 313 } | |
| 20417 | 314 |
| 315 void G1MarkSweep::prepare_compaction_work(G1PrepareCompactClosure* blk) { | |
| 316 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 317 g1h->heap_region_iterate(blk); | |
| 318 blk->update_sets(); | |
| 319 } | |
| 320 | |
| 321 void G1PrepareCompactClosure::free_humongous_region(HeapRegion* hr) { | |
| 322 HeapWord* end = hr->end(); | |
| 323 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
| 324 | |
| 325 assert(hr->startsHumongous(), | |
| 326 "Only the start of a humongous region should be freed."); | |
| 327 | |
| 328 hr->set_containing_set(NULL); | |
| 329 _humongous_regions_removed.increment(1u, hr->capacity()); | |
| 330 | |
| 331 _g1h->free_humongous_region(hr, &dummy_free_list, false /* par */); | |
| 332 prepare_for_compaction(hr, end); | |
| 333 dummy_free_list.remove_all(); | |
| 334 } | |
| 335 | |
| 336 void G1PrepareCompactClosure::prepare_for_compaction(HeapRegion* hr, HeapWord* end) { | |
| 337 // If this is the first live region that we came across which we can compact, | |
| 338 // initialize the CompactPoint. | |
| 339 if (!is_cp_initialized()) { | |
| 340 _cp.space = hr; | |
| 341 _cp.threshold = hr->initialize_threshold(); | |
| 342 } | |
| 343 prepare_for_compaction_work(&_cp, hr, end); | |
| 344 } | |
| 345 | |
| 346 void G1PrepareCompactClosure::prepare_for_compaction_work(CompactPoint* cp, | |
| 347 HeapRegion* hr, | |
| 348 HeapWord* end) { | |
| 349 hr->prepare_for_compaction(cp); | |
| 350 // Also clear the part of the card table that will be unused after | |
| 351 // compaction. | |
| 352 _mrbs->clear(MemRegion(hr->compaction_top(), end)); | |
| 353 } | |
| 354 | |
| 355 void G1PrepareCompactClosure::update_sets() { | |
| 356 // We'll recalculate total used bytes and recreate the free list | |
| 357 // at the end of the GC, so no point in updating those values here. | |
| 358 HeapRegionSetCount empty_set; | |
| 359 _g1h->remove_from_old_sets(empty_set, _humongous_regions_removed); | |
| 360 } | |
| 361 | |
| 362 bool G1PrepareCompactClosure::doHeapRegion(HeapRegion* hr) { | |
| 363 if (hr->isHumongous()) { | |
| 364 if (hr->startsHumongous()) { | |
| 365 oop obj = oop(hr->bottom()); | |
| 366 if (obj->is_gc_marked()) { | |
| 367 obj->forward_to(obj); | |
| 368 } else { | |
| 369 free_humongous_region(hr); | |
| 370 } | |
| 371 } else { | |
| 372 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 373 } | |
| 374 } else { | |
| 375 prepare_for_compaction(hr, hr->end()); | |
| 376 } | |
| 377 return false; | |
| 378 } |