Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author | stefank |
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date | Mon, 07 Jul 2014 10:12:40 +0200 |
parents | 64ac9c55d666 |
children | 3f2894c5052e |
rev | line source |
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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 | |
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 // "free at last gc" is calculated from these. | |
104 // CHF: cheating for now!!! | |
105 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
106 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
107 | |
108 Threads::gc_epilogue(); | |
109 CodeCache::gc_epilogue(); | |
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110 JvmtiExport::gc_epilogue(); |
342 | 111 |
112 // refs processing: clean slate | |
113 GenMarkSweep::_ref_processor = NULL; | |
114 } | |
115 | |
116 | |
117 void G1MarkSweep::allocate_stacks() { | |
118 GenMarkSweep::_preserved_count_max = 0; | |
119 GenMarkSweep::_preserved_marks = NULL; | |
120 GenMarkSweep::_preserved_count = 0; | |
121 } | |
122 | |
123 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
124 bool clear_all_softrefs) { | |
125 // Recursively traverse all live objects and mark them | |
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126 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
342 | 127 GenMarkSweep::trace(" 1"); |
128 | |
129 SharedHeap* sh = SharedHeap::heap(); | |
130 | |
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131 // Need cleared claim bits for the roots processing |
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132 ClassLoaderDataGraph::clear_claimed_marks(); |
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133 |
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134 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations); |
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135 sh->process_strong_roots(true, // activate StrongRootsScope |
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136 SharedHeap::SO_None, |
342 | 137 &GenMarkSweep::follow_root_closure, |
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138 &GenMarkSweep::follow_cld_closure, |
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139 &follow_code_closure); |
342 | 140 |
141 // Process reference objects found during marking | |
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142 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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143 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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144 |
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145 rp->setup_policy(clear_all_softrefs); |
10405 | 146 const ReferenceProcessorStats& stats = |
147 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
148 &GenMarkSweep::keep_alive, | |
149 &GenMarkSweep::follow_stack_closure, | |
150 NULL, | |
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151 gc_timer(), |
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152 gc_tracer()->gc_id()); |
10405 | 153 gc_tracer()->report_gc_reference_stats(stats); |
342 | 154 |
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155 |
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156 // This is the point where the entire marking should have completed. |
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157 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
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158 |
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159 // Unload classes and purge the SystemDictionary. |
342 | 160 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
161 | |
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162 // Unload nmethods. |
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163 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
342 | 164 |
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165 // Prune dead klasses from subklass/sibling/implementor lists. |
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166 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
342 | 167 |
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168 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
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169 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
342 | 170 |
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171 if (VerifyDuringGC) { |
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172 HandleMark hm; // handle scope |
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173 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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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. |
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185 if (!VerifySilently) { |
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186 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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187 } |
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188 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
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189 if (!VerifySilently) { |
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190 gclog_or_tty->print_cr("]"); |
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191 } |
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192 } |
10405 | 193 |
194 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
342 | 195 } |
196 | |
197 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 198 G1CollectedHeap* _g1h; |
342 | 199 ModRefBarrierSet* _mrbs; |
200 CompactPoint _cp; | |
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201 HeapRegionSetCount _humongous_regions_removed; |
342 | 202 |
203 void free_humongous_region(HeapRegion* hr) { | |
204 HeapWord* end = hr->end(); | |
2361 | 205 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); |
206 | |
342 | 207 assert(hr->startsHumongous(), |
208 "Only the start of a humongous region should be freed."); | |
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209 |
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210 hr->set_containing_set(NULL); |
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211 _humongous_regions_removed.increment(1u, hr->capacity()); |
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212 |
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213 _g1h->free_humongous_region(hr, &dummy_free_list, false /* par */); |
342 | 214 hr->prepare_for_compaction(&_cp); |
215 // Also clear the part of the card table that will be unused after | |
216 // compaction. | |
2152 | 217 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 218 dummy_free_list.remove_all(); |
342 | 219 } |
220 | |
221 public: | |
2152 | 222 G1PrepareCompactClosure(CompactibleSpace* cs) |
223 : _g1h(G1CollectedHeap::heap()), | |
12343 | 224 _mrbs(_g1h->g1_barrier_set()), |
342 | 225 _cp(NULL, cs, cs->initialize_threshold()), |
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226 _humongous_regions_removed() { } |
2152 | 227 |
228 void update_sets() { | |
229 // We'll recalculate total used bytes and recreate the free list | |
230 // at the end of the GC, so no point in updating those values here. | |
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231 HeapRegionSetCount empty_set; |
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232 _g1h->remove_from_old_sets(empty_set, _humongous_regions_removed); |
2152 | 233 } |
234 | |
342 | 235 bool doHeapRegion(HeapRegion* hr) { |
236 if (hr->isHumongous()) { | |
237 if (hr->startsHumongous()) { | |
238 oop obj = oop(hr->bottom()); | |
239 if (obj->is_gc_marked()) { | |
240 obj->forward_to(obj); | |
241 } else { | |
242 free_humongous_region(hr); | |
243 } | |
244 } else { | |
245 assert(hr->continuesHumongous(), "Invalid humongous."); | |
246 } | |
247 } else { | |
248 hr->prepare_for_compaction(&_cp); | |
249 // Also clear the part of the card table that will be unused after | |
250 // compaction. | |
251 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
252 } | |
253 return false; | |
254 } | |
255 }; | |
677 | 256 |
342 | 257 void G1MarkSweep::mark_sweep_phase2() { |
258 // Now all live objects are marked, compute the new object addresses. | |
259 | |
260 // It is not required that we traverse spaces in the same order in | |
261 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
262 // tracking expects us to do so. See comment under phase4. | |
263 | |
264 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
265 | |
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266 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
342 | 267 GenMarkSweep::trace("2"); |
268 | |
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269 // find the first region |
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270 HeapRegion* r = g1h->region_at(0); |
342 | 271 CompactibleSpace* sp = r; |
272 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
273 sp = r->next_compaction_space(); | |
274 } | |
275 | |
677 | 276 G1PrepareCompactClosure blk(sp); |
342 | 277 g1h->heap_region_iterate(&blk); |
2152 | 278 blk.update_sets(); |
342 | 279 } |
280 | |
281 class G1AdjustPointersClosure: public HeapRegionClosure { | |
282 public: | |
283 bool doHeapRegion(HeapRegion* r) { | |
284 if (r->isHumongous()) { | |
285 if (r->startsHumongous()) { | |
286 // We must adjust the pointers on the single H object. | |
287 oop obj = oop(r->bottom()); | |
288 // point all the oops to the new location | |
289 obj->adjust_pointers(); | |
290 } | |
291 } else { | |
292 // This really ought to be "as_CompactibleSpace"... | |
293 r->adjust_pointers(); | |
294 } | |
295 return false; | |
296 } | |
297 }; | |
298 | |
299 void G1MarkSweep::mark_sweep_phase3() { | |
300 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
301 | |
302 // Adjust the pointers to reflect the new locations | |
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303 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
342 | 304 GenMarkSweep::trace("3"); |
305 | |
306 SharedHeap* sh = SharedHeap::heap(); | |
307 | |
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308 // Need cleared claim bits for the roots processing |
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309 ClassLoaderDataGraph::clear_claimed_marks(); |
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310 |
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311 CodeBlobToOopClosure adjust_code_closure(&GenMarkSweep::adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations); |
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312 sh->process_all_roots(true, // activate StrongRootsScope |
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313 SharedHeap::SO_AllCodeCache, |
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314 &GenMarkSweep::adjust_pointer_closure, |
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315 &GenMarkSweep::adjust_cld_closure, |
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316 &adjust_code_closure); |
342 | 317 |
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318 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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319 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
342 | 320 |
321 // Now adjust pointers in remaining weak roots. (All of which should | |
322 // have been cleared if they pointed to non-surviving objects.) | |
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323 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure); |
342 | 324 |
17764 | 325 if (G1StringDedup::is_enabled()) { |
326 G1StringDedup::oops_do(&GenMarkSweep::adjust_pointer_closure); | |
327 } | |
328 | |
342 | 329 GenMarkSweep::adjust_marks(); |
330 | |
331 G1AdjustPointersClosure blk; | |
332 g1h->heap_region_iterate(&blk); | |
333 } | |
334 | |
335 class G1SpaceCompactClosure: public HeapRegionClosure { | |
336 public: | |
337 G1SpaceCompactClosure() {} | |
338 | |
339 bool doHeapRegion(HeapRegion* hr) { | |
340 if (hr->isHumongous()) { | |
341 if (hr->startsHumongous()) { | |
342 oop obj = oop(hr->bottom()); | |
343 if (obj->is_gc_marked()) { | |
344 obj->init_mark(); | |
345 } else { | |
346 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
347 } | |
348 hr->reset_during_compaction(); | |
349 } | |
350 } else { | |
351 hr->compact(); | |
352 } | |
353 return false; | |
354 } | |
355 }; | |
356 | |
357 void G1MarkSweep::mark_sweep_phase4() { | |
358 // All pointers are now adjusted, move objects accordingly | |
359 | |
360 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
361 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
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362 // here (code and comment not fixed for perm removal), so we tell the validate code |
342 | 363 // to use a higher index (saved from phase2) when verifying perm_gen. |
364 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
365 | |
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366 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id()); |
342 | 367 GenMarkSweep::trace("4"); |
368 | |
369 G1SpaceCompactClosure blk; | |
370 g1h->heap_region_iterate(&blk); | |
371 | |
372 } |