Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 2037:b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
Summary: Initialize the _is_alive_non_header field of G1's reference processor with an instance of the G1CMIsAliveClosure. This will stop adding reference objects with live referents to the discovered reference lists unnecessarily.
Reviewed-by: tonyp, ysr, jwilhelm, brutisso
author | johnc |
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date | Fri, 17 Dec 2010 11:26:53 -0800 |
parents | f95d63e2154a |
children | 9afee0b9fc1d 0fa27f37d4d4 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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" | |
32 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
33 #include "memory/gcLocker.hpp" | |
34 #include "memory/genCollectedHeap.hpp" | |
35 #include "memory/modRefBarrierSet.hpp" | |
36 #include "memory/referencePolicy.hpp" | |
37 #include "memory/space.hpp" | |
38 #include "oops/instanceRefKlass.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "prims/jvmtiExport.hpp" | |
41 #include "runtime/aprofiler.hpp" | |
42 #include "runtime/biasedLocking.hpp" | |
43 #include "runtime/fprofiler.hpp" | |
44 #include "runtime/synchronizer.hpp" | |
45 #include "runtime/thread.hpp" | |
46 #include "runtime/vmThread.hpp" | |
47 #include "utilities/copy.hpp" | |
48 #include "utilities/events.hpp" | |
342 | 49 |
50 class HeapRegion; | |
51 | |
52 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
53 bool clear_all_softrefs) { | |
54 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
55 | |
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56 SharedHeap* sh = SharedHeap::heap(); |
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57 #ifdef ASSERT |
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58 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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59 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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60 } |
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61 #endif |
342 | 62 // hook up weak ref data so it can be used during Mark-Sweep |
63 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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64 assert(rp != NULL, "should be non-NULL"); |
342 | 65 GenMarkSweep::_ref_processor = rp; |
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66 rp->setup_policy(clear_all_softrefs); |
342 | 67 |
68 // When collecting the permanent generation methodOops may be moving, | |
69 // so we either have to flush all bcp data or convert it into bci. | |
70 CodeCache::gc_prologue(); | |
71 Threads::gc_prologue(); | |
72 | |
73 // Increment the invocation count for the permanent generation, since it is | |
74 // implicitly collected whenever we do a full mark sweep collection. | |
75 sh->perm_gen()->stat_record()->invocations++; | |
76 | |
77 bool marked_for_unloading = false; | |
78 | |
79 allocate_stacks(); | |
80 | |
358
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81 // We should save the marks of the currently locked biased monitors. |
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82 // The marking doesn't preserve the marks of biased objects. |
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83 BiasedLocking::preserve_marks(); |
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84 |
342 | 85 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
86 | |
751 | 87 if (VerifyDuringGC) { |
342 | 88 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
89 g1h->checkConcurrentMark(); | |
90 } | |
91 | |
92 mark_sweep_phase2(); | |
93 | |
94 // Don't add any more derived pointers during phase3 | |
95 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
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 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
106 GenRemSet* rs = sh->rem_set(); | |
107 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
108 | |
109 // "free at last gc" is calculated from these. | |
110 // CHF: cheating for now!!! | |
111 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
112 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
113 | |
114 Threads::gc_epilogue(); | |
115 CodeCache::gc_epilogue(); | |
116 | |
117 // refs processing: clean slate | |
118 GenMarkSweep::_ref_processor = NULL; | |
119 } | |
120 | |
121 | |
122 void G1MarkSweep::allocate_stacks() { | |
123 GenMarkSweep::_preserved_count_max = 0; | |
124 GenMarkSweep::_preserved_marks = NULL; | |
125 GenMarkSweep::_preserved_count = 0; | |
126 } | |
127 | |
128 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
129 bool clear_all_softrefs) { | |
130 // Recursively traverse all live objects and mark them | |
131 EventMark m("1 mark object"); | |
132 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
133 GenMarkSweep::trace(" 1"); | |
134 | |
135 SharedHeap* sh = SharedHeap::heap(); | |
136 | |
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137 sh->process_strong_roots(true, // activeate StrongRootsScope |
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138 true, // Collecting permanent generation. |
342 | 139 SharedHeap::SO_SystemClasses, |
140 &GenMarkSweep::follow_root_closure, | |
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141 &GenMarkSweep::follow_code_root_closure, |
342 | 142 &GenMarkSweep::follow_root_closure); |
143 | |
144 // Process reference objects found during marking | |
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145 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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146 rp->setup_policy(clear_all_softrefs); |
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147 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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148 &GenMarkSweep::keep_alive, |
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149 &GenMarkSweep::follow_stack_closure, |
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150 NULL); |
342 | 151 |
152 // Follow system dictionary roots and unload classes | |
153 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
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154 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 155 "stack should be empty by now"); |
156 | |
157 // Follow code cache roots (has to be done after system dictionary, | |
158 // assumes all live klasses are marked) | |
159 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
160 &GenMarkSweep::keep_alive, | |
161 purged_class); | |
941 | 162 GenMarkSweep::follow_stack(); |
342 | 163 |
164 // Update subklass/sibling/implementor links of live klasses | |
165 GenMarkSweep::follow_weak_klass_links(); | |
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166 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 167 "stack should be empty by now"); |
168 | |
941 | 169 // Visit memoized MDO's and clear any unmarked weak refs |
170 GenMarkSweep::follow_mdo_weak_refs(); | |
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171 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained"); |
941 | 172 |
173 | |
342 | 174 // Visit symbol and interned string tables and delete unmarked oops |
175 SymbolTable::unlink(&GenMarkSweep::is_alive); | |
176 StringTable::unlink(&GenMarkSweep::is_alive); | |
177 | |
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178 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 179 "stack should be empty by now"); |
180 } | |
181 | |
182 class G1PrepareCompactClosure: public HeapRegionClosure { | |
183 ModRefBarrierSet* _mrbs; | |
184 CompactPoint _cp; | |
185 | |
186 void free_humongous_region(HeapRegion* hr) { | |
187 HeapWord* bot = hr->bottom(); | |
188 HeapWord* end = hr->end(); | |
189 assert(hr->startsHumongous(), | |
190 "Only the start of a humongous region should be freed."); | |
191 G1CollectedHeap::heap()->free_region(hr); | |
192 hr->prepare_for_compaction(&_cp); | |
193 // Also clear the part of the card table that will be unused after | |
194 // compaction. | |
195 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
196 } | |
197 | |
198 public: | |
677 | 199 G1PrepareCompactClosure(CompactibleSpace* cs) : |
342 | 200 _cp(NULL, cs, cs->initialize_threshold()), |
677 | 201 _mrbs(G1CollectedHeap::heap()->mr_bs()) |
342 | 202 {} |
203 bool doHeapRegion(HeapRegion* hr) { | |
204 if (hr->isHumongous()) { | |
205 if (hr->startsHumongous()) { | |
206 oop obj = oop(hr->bottom()); | |
207 if (obj->is_gc_marked()) { | |
208 obj->forward_to(obj); | |
209 } else { | |
210 free_humongous_region(hr); | |
211 } | |
212 } else { | |
213 assert(hr->continuesHumongous(), "Invalid humongous."); | |
214 } | |
215 } else { | |
216 hr->prepare_for_compaction(&_cp); | |
217 // Also clear the part of the card table that will be unused after | |
218 // compaction. | |
219 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
220 } | |
221 return false; | |
222 } | |
223 }; | |
677 | 224 |
225 // Finds the first HeapRegion. | |
342 | 226 class FindFirstRegionClosure: public HeapRegionClosure { |
227 HeapRegion* _a_region; | |
228 public: | |
677 | 229 FindFirstRegionClosure() : _a_region(NULL) {} |
342 | 230 bool doHeapRegion(HeapRegion* r) { |
677 | 231 _a_region = r; |
232 return true; | |
342 | 233 } |
234 HeapRegion* result() { return _a_region; } | |
235 }; | |
236 | |
237 void G1MarkSweep::mark_sweep_phase2() { | |
238 // Now all live objects are marked, compute the new object addresses. | |
239 | |
240 // It is imperative that we traverse perm_gen LAST. If dead space is | |
241 // allowed a range of dead object may get overwritten by a dead int | |
242 // array. If perm_gen is not traversed last a klassOop may get | |
243 // overwritten. This is fine since it is dead, but if the class has dead | |
244 // instances we have to skip them, and in order to find their size we | |
245 // need the klassOop! | |
246 // | |
247 // It is not required that we traverse spaces in the same order in | |
248 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
249 // tracking expects us to do so. See comment under phase4. | |
250 | |
251 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
252 Generation* pg = g1h->perm_gen(); | |
253 | |
254 EventMark m("2 compute new addresses"); | |
255 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
256 GenMarkSweep::trace("2"); | |
257 | |
677 | 258 FindFirstRegionClosure cl; |
342 | 259 g1h->heap_region_iterate(&cl); |
260 HeapRegion *r = cl.result(); | |
261 CompactibleSpace* sp = r; | |
262 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
263 sp = r->next_compaction_space(); | |
264 } | |
265 | |
677 | 266 G1PrepareCompactClosure blk(sp); |
342 | 267 g1h->heap_region_iterate(&blk); |
268 | |
269 CompactPoint perm_cp(pg, NULL, NULL); | |
270 pg->prepare_for_compaction(&perm_cp); | |
271 } | |
272 | |
273 class G1AdjustPointersClosure: public HeapRegionClosure { | |
274 public: | |
275 bool doHeapRegion(HeapRegion* r) { | |
276 if (r->isHumongous()) { | |
277 if (r->startsHumongous()) { | |
278 // We must adjust the pointers on the single H object. | |
279 oop obj = oop(r->bottom()); | |
280 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
281 // point all the oops to the new location | |
282 obj->adjust_pointers(); | |
283 debug_only(GenMarkSweep::check_interior_pointers()); | |
284 } | |
285 } else { | |
286 // This really ought to be "as_CompactibleSpace"... | |
287 r->adjust_pointers(); | |
288 } | |
289 return false; | |
290 } | |
291 }; | |
292 | |
293 void G1MarkSweep::mark_sweep_phase3() { | |
294 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
295 Generation* pg = g1h->perm_gen(); | |
296 | |
297 // Adjust the pointers to reflect the new locations | |
298 EventMark m("3 adjust pointers"); | |
299 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
300 GenMarkSweep::trace("3"); | |
301 | |
302 SharedHeap* sh = SharedHeap::heap(); | |
303 | |
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304 sh->process_strong_roots(true, // activate StrongRootsScope |
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305 true, // Collecting permanent generation. |
342 | 306 SharedHeap::SO_AllClasses, |
307 &GenMarkSweep::adjust_root_pointer_closure, | |
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308 NULL, // do not touch code cache here |
342 | 309 &GenMarkSweep::adjust_pointer_closure); |
310 | |
311 g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); | |
312 | |
313 // Now adjust pointers in remaining weak roots. (All of which should | |
314 // have been cleared if they pointed to non-surviving objects.) | |
315 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
316 &GenMarkSweep::adjust_pointer_closure); | |
317 | |
318 GenMarkSweep::adjust_marks(); | |
319 | |
320 G1AdjustPointersClosure blk; | |
321 g1h->heap_region_iterate(&blk); | |
322 pg->adjust_pointers(); | |
323 } | |
324 | |
325 class G1SpaceCompactClosure: public HeapRegionClosure { | |
326 public: | |
327 G1SpaceCompactClosure() {} | |
328 | |
329 bool doHeapRegion(HeapRegion* hr) { | |
330 if (hr->isHumongous()) { | |
331 if (hr->startsHumongous()) { | |
332 oop obj = oop(hr->bottom()); | |
333 if (obj->is_gc_marked()) { | |
334 obj->init_mark(); | |
335 } else { | |
336 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
337 } | |
338 hr->reset_during_compaction(); | |
339 } | |
340 } else { | |
341 hr->compact(); | |
342 } | |
343 return false; | |
344 } | |
345 }; | |
346 | |
347 void G1MarkSweep::mark_sweep_phase4() { | |
348 // All pointers are now adjusted, move objects accordingly | |
349 | |
350 // It is imperative that we traverse perm_gen first in phase4. All | |
351 // classes must be allocated earlier than their instances, and traversing | |
352 // perm_gen first makes sure that all klassOops have moved to their new | |
353 // location before any instance does a dispatch through it's klass! | |
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 | |
357 // here (perm_gen first rather than last), so we tell the validate code | |
358 // to use a higher index (saved from phase2) when verifying perm_gen. | |
359 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
360 Generation* pg = g1h->perm_gen(); | |
361 | |
362 EventMark m("4 compact heap"); | |
363 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
364 GenMarkSweep::trace("4"); | |
365 | |
366 pg->compact(); | |
367 | |
368 G1SpaceCompactClosure blk; | |
369 g1h->heap_region_iterate(&blk); | |
370 | |
371 } | |
372 | |
373 // Local Variables: *** | |
374 // c-indentation-style: gnu *** | |
375 // End: *** |