Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 8855:24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
Summary: Some parts of the G1 heap can only be walked during a safepoint. Skip verifying these parts of the heap when verifying during JVM startup.
Reviewed-by: brutisso, tschatzl
author | johnc |
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date | Fri, 29 Mar 2013 13:49:37 -0700 |
parents | b735136e0d82 |
children | a08c80e9e1e5 |
rev | line source |
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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 |
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71 // When collecting the permanent generation Method*s may be moving, |
342 | 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 bool marked_for_unloading = false; | |
77 | |
78 allocate_stacks(); | |
79 | |
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80 // We should save the marks of the currently locked biased monitors. |
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81 // The marking doesn't preserve the marks of biased objects. |
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82 BiasedLocking::preserve_marks(); |
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83 |
342 | 84 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
85 | |
86 mark_sweep_phase2(); | |
87 | |
88 // Don't add any more derived pointers during phase3 | |
89 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
90 | |
91 mark_sweep_phase3(); | |
92 | |
93 mark_sweep_phase4(); | |
94 | |
95 GenMarkSweep::restore_marks(); | |
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96 BiasedLocking::restore_marks(); |
342 | 97 GenMarkSweep::deallocate_stacks(); |
98 | |
99 // "free at last gc" is calculated from these. | |
100 // CHF: cheating for now!!! | |
101 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
102 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
103 | |
104 Threads::gc_epilogue(); | |
105 CodeCache::gc_epilogue(); | |
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106 JvmtiExport::gc_epilogue(); |
342 | 107 |
108 // refs processing: clean slate | |
109 GenMarkSweep::_ref_processor = NULL; | |
110 } | |
111 | |
112 | |
113 void G1MarkSweep::allocate_stacks() { | |
114 GenMarkSweep::_preserved_count_max = 0; | |
115 GenMarkSweep::_preserved_marks = NULL; | |
116 GenMarkSweep::_preserved_count = 0; | |
117 } | |
118 | |
119 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
120 bool clear_all_softrefs) { | |
121 // Recursively traverse all live objects and mark them | |
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122 TraceTime tm("phase 1", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 123 GenMarkSweep::trace(" 1"); |
124 | |
125 SharedHeap* sh = SharedHeap::heap(); | |
126 | |
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127 // Need cleared claim bits for the strong roots processing |
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128 ClassLoaderDataGraph::clear_claimed_marks(); |
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129 |
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130 sh->process_strong_roots(true, // activate StrongRootsScope |
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131 false, // not scavenging. |
342 | 132 SharedHeap::SO_SystemClasses, |
133 &GenMarkSweep::follow_root_closure, | |
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134 &GenMarkSweep::follow_code_root_closure, |
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135 &GenMarkSweep::follow_klass_closure); |
342 | 136 |
137 // Process reference objects found during marking | |
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138 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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139 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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140 |
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141 rp->setup_policy(clear_all_softrefs); |
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142 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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143 &GenMarkSweep::keep_alive, |
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144 &GenMarkSweep::follow_stack_closure, |
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145 NULL); |
342 | 146 |
147 // Follow system dictionary roots and unload classes | |
148 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
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149 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 150 "stack should be empty by now"); |
151 | |
152 // Follow code cache roots (has to be done after system dictionary, | |
153 // assumes all live klasses are marked) | |
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154 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
941 | 155 GenMarkSweep::follow_stack(); |
342 | 156 |
157 // Update subklass/sibling/implementor links of live klasses | |
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158 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
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159 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 160 "stack should be empty by now"); |
161 | |
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162 // Visit interned string tables and delete unmarked oops |
342 | 163 StringTable::unlink(&GenMarkSweep::is_alive); |
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164 // Clean up unreferenced symbols in symbol table. |
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165 SymbolTable::unlink(); |
342 | 166 |
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167 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 168 "stack should be empty by now"); |
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169 |
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170 if (VerifyDuringGC) { |
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171 HandleMark hm; // handle scope |
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172 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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173 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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174 Universe::heap()->prepare_for_verify(); |
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175 // Note: we can verify only the heap here. When an object is |
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176 // marked, the previous value of the mark word (including |
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177 // identity hash values, ages, etc) is preserved, and the mark |
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178 // word is set to markOop::marked_value - effectively removing |
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179 // any hash values from the mark word. These hash values are |
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180 // used when verifying the dictionaries and so removing them |
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181 // from the mark word can make verification of the dictionaries |
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182 // fail. At the end of the GC, the orginal mark word values |
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183 // (including hash values) are restored to the appropriate |
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184 // objects. |
6008 | 185 Universe::heap()->verify(/* silent */ false, |
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186 /* option */ VerifyOption_G1UseMarkWord); |
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187 |
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188 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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189 gclog_or_tty->print_cr("]"); |
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190 } |
342 | 191 } |
192 | |
193 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 194 G1CollectedHeap* _g1h; |
342 | 195 ModRefBarrierSet* _mrbs; |
196 CompactPoint _cp; | |
2152 | 197 HumongousRegionSet _humongous_proxy_set; |
342 | 198 |
199 void free_humongous_region(HeapRegion* hr) { | |
200 HeapWord* end = hr->end(); | |
2361 | 201 size_t dummy_pre_used; |
202 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
203 | |
342 | 204 assert(hr->startsHumongous(), |
205 "Only the start of a humongous region should be freed."); | |
2361 | 206 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
2152 | 207 &_humongous_proxy_set, false /* par */); |
342 | 208 hr->prepare_for_compaction(&_cp); |
209 // Also clear the part of the card table that will be unused after | |
210 // compaction. | |
2152 | 211 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 212 dummy_free_list.remove_all(); |
342 | 213 } |
214 | |
215 public: | |
2152 | 216 G1PrepareCompactClosure(CompactibleSpace* cs) |
217 : _g1h(G1CollectedHeap::heap()), | |
218 _mrbs(G1CollectedHeap::heap()->mr_bs()), | |
342 | 219 _cp(NULL, cs, cs->initialize_threshold()), |
2152 | 220 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
221 | |
222 void update_sets() { | |
223 // We'll recalculate total used bytes and recreate the free list | |
224 // at the end of the GC, so no point in updating those values here. | |
225 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
226 NULL, /* free_list */ | |
4072 | 227 NULL, /* old_proxy_set */ |
2152 | 228 &_humongous_proxy_set, |
229 false /* par */); | |
230 } | |
231 | |
342 | 232 bool doHeapRegion(HeapRegion* hr) { |
233 if (hr->isHumongous()) { | |
234 if (hr->startsHumongous()) { | |
235 oop obj = oop(hr->bottom()); | |
236 if (obj->is_gc_marked()) { | |
237 obj->forward_to(obj); | |
238 } else { | |
239 free_humongous_region(hr); | |
240 } | |
241 } else { | |
242 assert(hr->continuesHumongous(), "Invalid humongous."); | |
243 } | |
244 } else { | |
245 hr->prepare_for_compaction(&_cp); | |
246 // Also clear the part of the card table that will be unused after | |
247 // compaction. | |
248 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
249 } | |
250 return false; | |
251 } | |
252 }; | |
677 | 253 |
342 | 254 void G1MarkSweep::mark_sweep_phase2() { |
255 // Now all live objects are marked, compute the new object addresses. | |
256 | |
257 // It is not required that we traverse spaces in the same order in | |
258 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
259 // tracking expects us to do so. See comment under phase4. | |
260 | |
261 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
262 | |
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263 TraceTime tm("phase 2", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 264 GenMarkSweep::trace("2"); |
265 | |
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266 // find the first region |
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267 HeapRegion* r = g1h->region_at(0); |
342 | 268 CompactibleSpace* sp = r; |
269 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
270 sp = r->next_compaction_space(); | |
271 } | |
272 | |
677 | 273 G1PrepareCompactClosure blk(sp); |
342 | 274 g1h->heap_region_iterate(&blk); |
2152 | 275 blk.update_sets(); |
342 | 276 } |
277 | |
278 class G1AdjustPointersClosure: public HeapRegionClosure { | |
279 public: | |
280 bool doHeapRegion(HeapRegion* r) { | |
281 if (r->isHumongous()) { | |
282 if (r->startsHumongous()) { | |
283 // We must adjust the pointers on the single H object. | |
284 oop obj = oop(r->bottom()); | |
285 // point all the oops to the new location | |
286 obj->adjust_pointers(); | |
287 } | |
288 } else { | |
289 // This really ought to be "as_CompactibleSpace"... | |
290 r->adjust_pointers(); | |
291 } | |
292 return false; | |
293 } | |
294 }; | |
295 | |
296 void G1MarkSweep::mark_sweep_phase3() { | |
297 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
298 | |
299 // Adjust the pointers to reflect the new locations | |
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300 TraceTime tm("phase 3", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 301 GenMarkSweep::trace("3"); |
302 | |
303 SharedHeap* sh = SharedHeap::heap(); | |
304 | |
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305 // Need cleared claim bits for the strong roots processing |
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306 ClassLoaderDataGraph::clear_claimed_marks(); |
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307 |
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308 sh->process_strong_roots(true, // activate StrongRootsScope |
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309 false, // not scavenging. |
342 | 310 SharedHeap::SO_AllClasses, |
311 &GenMarkSweep::adjust_root_pointer_closure, | |
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312 NULL, // do not touch code cache here |
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313 &GenMarkSweep::adjust_klass_closure); |
342 | 314 |
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315 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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316 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); |
342 | 317 |
318 // Now adjust pointers in remaining weak roots. (All of which should | |
319 // have been cleared if they pointed to non-surviving objects.) | |
320 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
321 &GenMarkSweep::adjust_pointer_closure); | |
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 | |
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360 TraceTime tm("phase 4", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 361 GenMarkSweep::trace("4"); |
362 | |
363 G1SpaceCompactClosure blk; | |
364 g1h->heap_region_iterate(&blk); | |
365 | |
366 } |