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annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 17677:51e1bb81df86 jdk8u20-b03
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author | amurillo |
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date | Tue, 25 Feb 2014 13:02:52 -0800 |
parents | 5a32d2a3cc1e |
children | 870aedf4ba4f 58fc1b1523dc |
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342 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, 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" |
10405 | 34 #include "gc_implementation/shared/gcHeapSummary.hpp" |
35 #include "gc_implementation/shared/gcTimer.hpp" | |
36 #include "gc_implementation/shared/gcTrace.hpp" | |
37 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 38 #include "memory/gcLocker.hpp" |
39 #include "memory/genCollectedHeap.hpp" | |
40 #include "memory/modRefBarrierSet.hpp" | |
41 #include "memory/referencePolicy.hpp" | |
42 #include "memory/space.hpp" | |
43 #include "oops/instanceRefKlass.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "runtime/biasedLocking.hpp" | |
47 #include "runtime/fprofiler.hpp" | |
48 #include "runtime/synchronizer.hpp" | |
49 #include "runtime/thread.hpp" | |
50 #include "runtime/vmThread.hpp" | |
51 #include "utilities/copy.hpp" | |
52 #include "utilities/events.hpp" | |
342 | 53 |
54 class HeapRegion; | |
55 | |
56 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
57 bool clear_all_softrefs) { | |
58 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
59 | |
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60 SharedHeap* sh = SharedHeap::heap(); |
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61 #ifdef ASSERT |
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62 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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63 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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64 } |
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65 #endif |
342 | 66 // hook up weak ref data so it can be used during Mark-Sweep |
67 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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68 assert(rp != NULL, "should be non-NULL"); |
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69 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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70 |
342 | 71 GenMarkSweep::_ref_processor = rp; |
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72 rp->setup_policy(clear_all_softrefs); |
342 | 73 |
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74 // When collecting the permanent generation Method*s may be moving, |
342 | 75 // so we either have to flush all bcp data or convert it into bci. |
76 CodeCache::gc_prologue(); | |
77 Threads::gc_prologue(); | |
78 | |
79 bool marked_for_unloading = false; | |
80 | |
81 allocate_stacks(); | |
82 | |
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83 // We should save the marks of the currently locked biased monitors. |
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84 // The marking doesn't preserve the marks of biased objects. |
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85 BiasedLocking::preserve_marks(); |
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86 |
342 | 87 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
88 | |
89 mark_sweep_phase2(); | |
90 | |
91 // Don't add any more derived pointers during phase3 | |
92 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
93 | |
94 mark_sweep_phase3(); | |
95 | |
96 mark_sweep_phase4(); | |
97 | |
98 GenMarkSweep::restore_marks(); | |
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99 BiasedLocking::restore_marks(); |
342 | 100 GenMarkSweep::deallocate_stacks(); |
101 | |
102 // "free at last gc" is calculated from these. | |
103 // CHF: cheating for now!!! | |
104 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
105 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
106 | |
107 Threads::gc_epilogue(); | |
108 CodeCache::gc_epilogue(); | |
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109 JvmtiExport::gc_epilogue(); |
342 | 110 |
111 // refs processing: clean slate | |
112 GenMarkSweep::_ref_processor = NULL; | |
113 } | |
114 | |
115 | |
116 void G1MarkSweep::allocate_stacks() { | |
117 GenMarkSweep::_preserved_count_max = 0; | |
118 GenMarkSweep::_preserved_marks = NULL; | |
119 GenMarkSweep::_preserved_count = 0; | |
120 } | |
121 | |
122 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
123 bool clear_all_softrefs) { | |
124 // Recursively traverse all live objects and mark them | |
10405 | 125 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 126 GenMarkSweep::trace(" 1"); |
127 | |
128 SharedHeap* sh = SharedHeap::heap(); | |
129 | |
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130 // Need cleared claim bits for the strong roots processing |
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131 ClassLoaderDataGraph::clear_claimed_marks(); |
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132 |
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133 sh->process_strong_roots(true, // activate StrongRootsScope |
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134 false, // not scavenging. |
342 | 135 SharedHeap::SO_SystemClasses, |
136 &GenMarkSweep::follow_root_closure, | |
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137 &GenMarkSweep::follow_code_root_closure, |
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138 &GenMarkSweep::follow_klass_closure); |
342 | 139 |
140 // Process reference objects found during marking | |
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141 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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142 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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143 |
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144 rp->setup_policy(clear_all_softrefs); |
10405 | 145 const ReferenceProcessorStats& stats = |
146 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
147 &GenMarkSweep::keep_alive, | |
148 &GenMarkSweep::follow_stack_closure, | |
149 NULL, | |
150 gc_timer()); | |
151 gc_tracer()->report_gc_reference_stats(stats); | |
342 | 152 |
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153 |
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154 // This is the point where the entire marking should have completed. |
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155 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
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156 |
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157 // Unload classes and purge the SystemDictionary. |
342 | 158 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
159 | |
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160 // Unload nmethods. |
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161 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
342 | 162 |
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163 // Prune dead klasses from subklass/sibling/implementor lists. |
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164 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
342 | 165 |
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166 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
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167 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
342 | 168 |
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169 if (VerifyDuringGC) { |
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170 HandleMark hm; // handle scope |
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171 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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172 Universe::heap()->prepare_for_verify(); |
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173 // Note: we can verify only the heap here. When an object is |
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174 // marked, the previous value of the mark word (including |
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175 // identity hash values, ages, etc) is preserved, and the mark |
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176 // word is set to markOop::marked_value - effectively removing |
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177 // any hash values from the mark word. These hash values are |
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178 // used when verifying the dictionaries and so removing them |
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179 // from the mark word can make verification of the dictionaries |
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180 // fail. At the end of the GC, the orginal mark word values |
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181 // (including hash values) are restored to the appropriate |
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182 // objects. |
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183 if (!VerifySilently) { |
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184 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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185 } |
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186 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
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187 if (!VerifySilently) { |
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188 gclog_or_tty->print_cr("]"); |
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189 } |
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190 } |
10405 | 191 |
192 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
342 | 193 } |
194 | |
195 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 196 G1CollectedHeap* _g1h; |
342 | 197 ModRefBarrierSet* _mrbs; |
198 CompactPoint _cp; | |
2152 | 199 HumongousRegionSet _humongous_proxy_set; |
342 | 200 |
201 void free_humongous_region(HeapRegion* hr) { | |
202 HeapWord* end = hr->end(); | |
2361 | 203 size_t dummy_pre_used; |
204 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
205 | |
342 | 206 assert(hr->startsHumongous(), |
207 "Only the start of a humongous region should be freed."); | |
2361 | 208 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
2152 | 209 &_humongous_proxy_set, false /* par */); |
342 | 210 hr->prepare_for_compaction(&_cp); |
211 // Also clear the part of the card table that will be unused after | |
212 // compaction. | |
2152 | 213 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 214 dummy_free_list.remove_all(); |
342 | 215 } |
216 | |
217 public: | |
2152 | 218 G1PrepareCompactClosure(CompactibleSpace* cs) |
219 : _g1h(G1CollectedHeap::heap()), | |
12343 | 220 _mrbs(_g1h->g1_barrier_set()), |
342 | 221 _cp(NULL, cs, cs->initialize_threshold()), |
2152 | 222 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
223 | |
224 void update_sets() { | |
225 // We'll recalculate total used bytes and recreate the free list | |
226 // at the end of the GC, so no point in updating those values here. | |
227 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
228 NULL, /* free_list */ | |
4072 | 229 NULL, /* old_proxy_set */ |
2152 | 230 &_humongous_proxy_set, |
231 false /* par */); | |
232 } | |
233 | |
342 | 234 bool doHeapRegion(HeapRegion* hr) { |
235 if (hr->isHumongous()) { | |
236 if (hr->startsHumongous()) { | |
237 oop obj = oop(hr->bottom()); | |
238 if (obj->is_gc_marked()) { | |
239 obj->forward_to(obj); | |
240 } else { | |
241 free_humongous_region(hr); | |
242 } | |
243 } else { | |
244 assert(hr->continuesHumongous(), "Invalid humongous."); | |
245 } | |
246 } else { | |
247 hr->prepare_for_compaction(&_cp); | |
248 // Also clear the part of the card table that will be unused after | |
249 // compaction. | |
250 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
251 } | |
252 return false; | |
253 } | |
254 }; | |
677 | 255 |
342 | 256 void G1MarkSweep::mark_sweep_phase2() { |
257 // Now all live objects are marked, compute the new object addresses. | |
258 | |
259 // It is not required that we traverse spaces in the same order in | |
260 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
261 // tracking expects us to do so. See comment under phase4. | |
262 | |
263 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
264 | |
10405 | 265 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 266 GenMarkSweep::trace("2"); |
267 | |
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268 // find the first region |
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269 HeapRegion* r = g1h->region_at(0); |
342 | 270 CompactibleSpace* sp = r; |
271 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
272 sp = r->next_compaction_space(); | |
273 } | |
274 | |
677 | 275 G1PrepareCompactClosure blk(sp); |
342 | 276 g1h->heap_region_iterate(&blk); |
2152 | 277 blk.update_sets(); |
342 | 278 } |
279 | |
280 class G1AdjustPointersClosure: public HeapRegionClosure { | |
281 public: | |
282 bool doHeapRegion(HeapRegion* r) { | |
283 if (r->isHumongous()) { | |
284 if (r->startsHumongous()) { | |
285 // We must adjust the pointers on the single H object. | |
286 oop obj = oop(r->bottom()); | |
287 // point all the oops to the new location | |
288 obj->adjust_pointers(); | |
289 } | |
290 } else { | |
291 // This really ought to be "as_CompactibleSpace"... | |
292 r->adjust_pointers(); | |
293 } | |
294 return false; | |
295 } | |
296 }; | |
297 | |
298 void G1MarkSweep::mark_sweep_phase3() { | |
299 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
300 | |
301 // Adjust the pointers to reflect the new locations | |
10405 | 302 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 303 GenMarkSweep::trace("3"); |
304 | |
305 SharedHeap* sh = SharedHeap::heap(); | |
306 | |
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307 // Need cleared claim bits for the strong roots processing |
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308 ClassLoaderDataGraph::clear_claimed_marks(); |
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309 |
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310 sh->process_strong_roots(true, // activate StrongRootsScope |
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311 false, // not scavenging. |
342 | 312 SharedHeap::SO_AllClasses, |
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313 &GenMarkSweep::adjust_pointer_closure, |
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314 NULL, // do not touch code cache here |
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315 &GenMarkSweep::adjust_klass_closure); |
342 | 316 |
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317 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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318 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
342 | 319 |
320 // Now adjust pointers in remaining weak roots. (All of which should | |
321 // have been cleared if they pointed to non-surviving objects.) | |
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322 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_pointer_closure); |
342 | 323 |
324 GenMarkSweep::adjust_marks(); | |
325 | |
326 G1AdjustPointersClosure blk; | |
327 g1h->heap_region_iterate(&blk); | |
328 } | |
329 | |
330 class G1SpaceCompactClosure: public HeapRegionClosure { | |
331 public: | |
332 G1SpaceCompactClosure() {} | |
333 | |
334 bool doHeapRegion(HeapRegion* hr) { | |
335 if (hr->isHumongous()) { | |
336 if (hr->startsHumongous()) { | |
337 oop obj = oop(hr->bottom()); | |
338 if (obj->is_gc_marked()) { | |
339 obj->init_mark(); | |
340 } else { | |
341 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
342 } | |
343 hr->reset_during_compaction(); | |
344 } | |
345 } else { | |
346 hr->compact(); | |
347 } | |
348 return false; | |
349 } | |
350 }; | |
351 | |
352 void G1MarkSweep::mark_sweep_phase4() { | |
353 // All pointers are now adjusted, move objects accordingly | |
354 | |
355 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
356 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
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357 // here (code and comment not fixed for perm removal), so we tell the validate code |
342 | 358 // to use a higher index (saved from phase2) when verifying perm_gen. |
359 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
360 | |
10405 | 361 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 362 GenMarkSweep::trace("4"); |
363 | |
364 G1SpaceCompactClosure blk; | |
365 g1h->heap_region_iterate(&blk); | |
366 | |
367 } |