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annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 1552:c18cbe5936b8
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Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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date | Thu, 27 May 2010 19:08:38 -0700 |
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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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_g1MarkSweep.cpp.incl" | |
27 | |
28 class HeapRegion; | |
29 | |
30 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
31 bool clear_all_softrefs) { | |
32 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
33 | |
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34 SharedHeap* sh = SharedHeap::heap(); |
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35 #ifdef ASSERT |
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36 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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37 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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38 } |
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39 #endif |
342 | 40 // hook up weak ref data so it can be used during Mark-Sweep |
41 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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42 assert(rp != NULL, "should be non-NULL"); |
342 | 43 GenMarkSweep::_ref_processor = rp; |
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44 rp->setup_policy(clear_all_softrefs); |
342 | 45 |
46 // When collecting the permanent generation methodOops may be moving, | |
47 // so we either have to flush all bcp data or convert it into bci. | |
48 CodeCache::gc_prologue(); | |
49 Threads::gc_prologue(); | |
50 | |
51 // Increment the invocation count for the permanent generation, since it is | |
52 // implicitly collected whenever we do a full mark sweep collection. | |
53 sh->perm_gen()->stat_record()->invocations++; | |
54 | |
55 bool marked_for_unloading = false; | |
56 | |
57 allocate_stacks(); | |
58 | |
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59 // We should save the marks of the currently locked biased monitors. |
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60 // The marking doesn't preserve the marks of biased objects. |
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61 BiasedLocking::preserve_marks(); |
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62 |
342 | 63 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
64 | |
751 | 65 if (VerifyDuringGC) { |
342 | 66 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
67 g1h->checkConcurrentMark(); | |
68 } | |
69 | |
70 mark_sweep_phase2(); | |
71 | |
72 // Don't add any more derived pointers during phase3 | |
73 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
74 | |
75 mark_sweep_phase3(); | |
76 | |
77 mark_sweep_phase4(); | |
78 | |
79 GenMarkSweep::restore_marks(); | |
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80 BiasedLocking::restore_marks(); |
342 | 81 GenMarkSweep::deallocate_stacks(); |
82 | |
83 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
84 GenRemSet* rs = sh->rem_set(); | |
85 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
86 | |
87 // "free at last gc" is calculated from these. | |
88 // CHF: cheating for now!!! | |
89 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
90 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
91 | |
92 Threads::gc_epilogue(); | |
93 CodeCache::gc_epilogue(); | |
94 | |
95 // refs processing: clean slate | |
96 GenMarkSweep::_ref_processor = NULL; | |
97 } | |
98 | |
99 | |
100 void G1MarkSweep::allocate_stacks() { | |
101 GenMarkSweep::_preserved_count_max = 0; | |
102 GenMarkSweep::_preserved_marks = NULL; | |
103 GenMarkSweep::_preserved_count = 0; | |
104 GenMarkSweep::_preserved_mark_stack = NULL; | |
105 GenMarkSweep::_preserved_oop_stack = NULL; | |
106 | |
107 GenMarkSweep::_marking_stack = | |
108 new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
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109 GenMarkSweep::_objarray_stack = |
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110 new (ResourceObj::C_HEAP) GrowableArray<ObjArrayTask>(50, true); |
342 | 111 |
941 | 112 int size = SystemDictionary::number_of_classes() * 2; |
342 | 113 GenMarkSweep::_revisit_klass_stack = |
941 | 114 new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true); |
115 // (#klass/k)^2 for k ~ 10 appears a better fit, but this will have to do | |
116 // for now until we have a chance to work out a more optimal setting. | |
117 GenMarkSweep::_revisit_mdo_stack = | |
118 new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true); | |
119 | |
342 | 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 | |
125 EventMark m("1 mark object"); | |
126 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
127 GenMarkSweep::trace(" 1"); | |
128 | |
129 SharedHeap* sh = SharedHeap::heap(); | |
130 | |
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131 sh->process_strong_roots(true, // activeate StrongRootsScope |
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132 true, // Collecting permanent generation. |
342 | 133 SharedHeap::SO_SystemClasses, |
134 &GenMarkSweep::follow_root_closure, | |
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135 &GenMarkSweep::follow_code_root_closure, |
342 | 136 &GenMarkSweep::follow_root_closure); |
137 | |
138 // Process reference objects found during marking | |
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139 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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140 rp->setup_policy(clear_all_softrefs); |
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141 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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142 &GenMarkSweep::keep_alive, |
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143 &GenMarkSweep::follow_stack_closure, |
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144 NULL); |
342 | 145 |
146 // Follow system dictionary roots and unload classes | |
147 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
148 assert(GenMarkSweep::_marking_stack->is_empty(), | |
149 "stack should be empty by now"); | |
150 | |
151 // Follow code cache roots (has to be done after system dictionary, | |
152 // assumes all live klasses are marked) | |
153 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
154 &GenMarkSweep::keep_alive, | |
155 purged_class); | |
941 | 156 GenMarkSweep::follow_stack(); |
342 | 157 |
158 // Update subklass/sibling/implementor links of live klasses | |
159 GenMarkSweep::follow_weak_klass_links(); | |
160 assert(GenMarkSweep::_marking_stack->is_empty(), | |
161 "stack should be empty by now"); | |
162 | |
941 | 163 // Visit memoized MDO's and clear any unmarked weak refs |
164 GenMarkSweep::follow_mdo_weak_refs(); | |
165 assert(GenMarkSweep::_marking_stack->is_empty(), "just drained"); | |
166 | |
167 | |
342 | 168 // Visit symbol and interned string tables and delete unmarked oops |
169 SymbolTable::unlink(&GenMarkSweep::is_alive); | |
170 StringTable::unlink(&GenMarkSweep::is_alive); | |
171 | |
172 assert(GenMarkSweep::_marking_stack->is_empty(), | |
173 "stack should be empty by now"); | |
174 } | |
175 | |
176 class G1PrepareCompactClosure: public HeapRegionClosure { | |
177 ModRefBarrierSet* _mrbs; | |
178 CompactPoint _cp; | |
179 | |
180 void free_humongous_region(HeapRegion* hr) { | |
181 HeapWord* bot = hr->bottom(); | |
182 HeapWord* end = hr->end(); | |
183 assert(hr->startsHumongous(), | |
184 "Only the start of a humongous region should be freed."); | |
185 G1CollectedHeap::heap()->free_region(hr); | |
186 hr->prepare_for_compaction(&_cp); | |
187 // Also clear the part of the card table that will be unused after | |
188 // compaction. | |
189 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
190 } | |
191 | |
192 public: | |
677 | 193 G1PrepareCompactClosure(CompactibleSpace* cs) : |
342 | 194 _cp(NULL, cs, cs->initialize_threshold()), |
677 | 195 _mrbs(G1CollectedHeap::heap()->mr_bs()) |
342 | 196 {} |
197 bool doHeapRegion(HeapRegion* hr) { | |
198 if (hr->isHumongous()) { | |
199 if (hr->startsHumongous()) { | |
200 oop obj = oop(hr->bottom()); | |
201 if (obj->is_gc_marked()) { | |
202 obj->forward_to(obj); | |
203 } else { | |
204 free_humongous_region(hr); | |
205 } | |
206 } else { | |
207 assert(hr->continuesHumongous(), "Invalid humongous."); | |
208 } | |
209 } else { | |
210 hr->prepare_for_compaction(&_cp); | |
211 // Also clear the part of the card table that will be unused after | |
212 // compaction. | |
213 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
214 } | |
215 return false; | |
216 } | |
217 }; | |
677 | 218 |
219 // Finds the first HeapRegion. | |
342 | 220 class FindFirstRegionClosure: public HeapRegionClosure { |
221 HeapRegion* _a_region; | |
222 public: | |
677 | 223 FindFirstRegionClosure() : _a_region(NULL) {} |
342 | 224 bool doHeapRegion(HeapRegion* r) { |
677 | 225 _a_region = r; |
226 return true; | |
342 | 227 } |
228 HeapRegion* result() { return _a_region; } | |
229 }; | |
230 | |
231 void G1MarkSweep::mark_sweep_phase2() { | |
232 // Now all live objects are marked, compute the new object addresses. | |
233 | |
234 // It is imperative that we traverse perm_gen LAST. If dead space is | |
235 // allowed a range of dead object may get overwritten by a dead int | |
236 // array. If perm_gen is not traversed last a klassOop may get | |
237 // overwritten. This is fine since it is dead, but if the class has dead | |
238 // instances we have to skip them, and in order to find their size we | |
239 // need the klassOop! | |
240 // | |
241 // It is not required that we traverse spaces in the same order in | |
242 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
243 // tracking expects us to do so. See comment under phase4. | |
244 | |
245 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
246 Generation* pg = g1h->perm_gen(); | |
247 | |
248 EventMark m("2 compute new addresses"); | |
249 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
250 GenMarkSweep::trace("2"); | |
251 | |
677 | 252 FindFirstRegionClosure cl; |
342 | 253 g1h->heap_region_iterate(&cl); |
254 HeapRegion *r = cl.result(); | |
255 CompactibleSpace* sp = r; | |
256 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
257 sp = r->next_compaction_space(); | |
258 } | |
259 | |
677 | 260 G1PrepareCompactClosure blk(sp); |
342 | 261 g1h->heap_region_iterate(&blk); |
262 | |
263 CompactPoint perm_cp(pg, NULL, NULL); | |
264 pg->prepare_for_compaction(&perm_cp); | |
265 } | |
266 | |
267 class G1AdjustPointersClosure: public HeapRegionClosure { | |
268 public: | |
269 bool doHeapRegion(HeapRegion* r) { | |
270 if (r->isHumongous()) { | |
271 if (r->startsHumongous()) { | |
272 // We must adjust the pointers on the single H object. | |
273 oop obj = oop(r->bottom()); | |
274 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
275 // point all the oops to the new location | |
276 obj->adjust_pointers(); | |
277 debug_only(GenMarkSweep::check_interior_pointers()); | |
278 } | |
279 } else { | |
280 // This really ought to be "as_CompactibleSpace"... | |
281 r->adjust_pointers(); | |
282 } | |
283 return false; | |
284 } | |
285 }; | |
286 | |
287 void G1MarkSweep::mark_sweep_phase3() { | |
288 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
289 Generation* pg = g1h->perm_gen(); | |
290 | |
291 // Adjust the pointers to reflect the new locations | |
292 EventMark m("3 adjust pointers"); | |
293 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
294 GenMarkSweep::trace("3"); | |
295 | |
296 SharedHeap* sh = SharedHeap::heap(); | |
297 | |
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298 sh->process_strong_roots(true, // activate StrongRootsScope |
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299 true, // Collecting permanent generation. |
342 | 300 SharedHeap::SO_AllClasses, |
301 &GenMarkSweep::adjust_root_pointer_closure, | |
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302 NULL, // do not touch code cache here |
342 | 303 &GenMarkSweep::adjust_pointer_closure); |
304 | |
305 g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); | |
306 | |
307 // Now adjust pointers in remaining weak roots. (All of which should | |
308 // have been cleared if they pointed to non-surviving objects.) | |
309 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
310 &GenMarkSweep::adjust_pointer_closure); | |
311 | |
312 GenMarkSweep::adjust_marks(); | |
313 | |
314 G1AdjustPointersClosure blk; | |
315 g1h->heap_region_iterate(&blk); | |
316 pg->adjust_pointers(); | |
317 } | |
318 | |
319 class G1SpaceCompactClosure: public HeapRegionClosure { | |
320 public: | |
321 G1SpaceCompactClosure() {} | |
322 | |
323 bool doHeapRegion(HeapRegion* hr) { | |
324 if (hr->isHumongous()) { | |
325 if (hr->startsHumongous()) { | |
326 oop obj = oop(hr->bottom()); | |
327 if (obj->is_gc_marked()) { | |
328 obj->init_mark(); | |
329 } else { | |
330 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
331 } | |
332 hr->reset_during_compaction(); | |
333 } | |
334 } else { | |
335 hr->compact(); | |
336 } | |
337 return false; | |
338 } | |
339 }; | |
340 | |
341 void G1MarkSweep::mark_sweep_phase4() { | |
342 // All pointers are now adjusted, move objects accordingly | |
343 | |
344 // It is imperative that we traverse perm_gen first in phase4. All | |
345 // classes must be allocated earlier than their instances, and traversing | |
346 // perm_gen first makes sure that all klassOops have moved to their new | |
347 // location before any instance does a dispatch through it's klass! | |
348 | |
349 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
350 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
351 // here (perm_gen first rather than last), so we tell the validate code | |
352 // to use a higher index (saved from phase2) when verifying perm_gen. | |
353 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
354 Generation* pg = g1h->perm_gen(); | |
355 | |
356 EventMark m("4 compact heap"); | |
357 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
358 GenMarkSweep::trace("4"); | |
359 | |
360 pg->compact(); | |
361 | |
362 G1SpaceCompactClosure blk; | |
363 g1h->heap_region_iterate(&blk); | |
364 | |
365 } | |
366 | |
367 // Local Variables: *** | |
368 // c-indentation-style: gnu *** | |
369 // End: *** |