Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 3914:20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
Summary: It introduces ergonomic decision logging in G1 for the following heuristics: heap sizing, collection set construction, concurrent cycle initiation, and partially-young GC start/end. The code has a bit of refactoring in a few places to make the decision logging possible. It also replaces alternative ad-hoc logging that we have under different parameters and switches (G1_DEBUG, G1PolicyVerbose).
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 07 Sep 2011 12:21:23 -0400 |
parents | 6747fd0512e0 |
children | 4dfb2df418f2 |
rev | line source |
---|---|
342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
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 | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
56 SharedHeap* sh = SharedHeap::heap(); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
57 #ifdef ASSERT |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
58 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
59 assert(clear_all_softrefs, "Policy should have been checked earler"); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
60 } |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
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"); | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
64 assert(rp != NULL, "should be non-NULL"); |
342 | 65 GenMarkSweep::_ref_processor = rp; |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
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
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
81 // We should save the marks of the currently locked biased monitors. |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
82 // The marking doesn't preserve the marks of biased objects. |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
83 BiasedLocking::preserve_marks(); |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
84 |
342 | 85 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
86 | |
87 mark_sweep_phase2(); | |
88 | |
89 // Don't add any more derived pointers during phase3 | |
90 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
91 | |
92 mark_sweep_phase3(); | |
93 | |
94 mark_sweep_phase4(); | |
95 | |
96 GenMarkSweep::restore_marks(); | |
358
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
97 BiasedLocking::restore_marks(); |
342 | 98 GenMarkSweep::deallocate_stacks(); |
99 | |
100 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
101 GenRemSet* rs = sh->rem_set(); | |
102 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
103 | |
104 // "free at last gc" is calculated from these. | |
105 // CHF: cheating for now!!! | |
106 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
107 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
108 | |
109 Threads::gc_epilogue(); | |
110 CodeCache::gc_epilogue(); | |
2147
9afee0b9fc1d
7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220)
kamg
parents:
1972
diff
changeset
|
111 JvmtiExport::gc_epilogue(); |
342 | 112 |
113 // refs processing: clean slate | |
114 GenMarkSweep::_ref_processor = NULL; | |
115 } | |
116 | |
117 | |
118 void G1MarkSweep::allocate_stacks() { | |
119 GenMarkSweep::_preserved_count_max = 0; | |
120 GenMarkSweep::_preserved_marks = NULL; | |
121 GenMarkSweep::_preserved_count = 0; | |
122 } | |
123 | |
124 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
125 bool clear_all_softrefs) { | |
126 // Recursively traverse all live objects and mark them | |
127 EventMark m("1 mark object"); | |
128 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
129 GenMarkSweep::trace(" 1"); | |
130 | |
131 SharedHeap* sh = SharedHeap::heap(); | |
132 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
133 sh->process_strong_roots(true, // activeate StrongRootsScope |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
134 true, // Collecting permanent generation. |
342 | 135 SharedHeap::SO_SystemClasses, |
136 &GenMarkSweep::follow_root_closure, | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
137 &GenMarkSweep::follow_code_root_closure, |
342 | 138 &GenMarkSweep::follow_root_closure); |
139 | |
140 // Process reference objects found during marking | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
141 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
142 rp->setup_policy(clear_all_softrefs); |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
143 rp->process_discovered_references(&GenMarkSweep::is_alive, |
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
144 &GenMarkSweep::keep_alive, |
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
145 &GenMarkSweep::follow_stack_closure, |
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
146 NULL); |
342 | 147 |
148 // Follow system dictionary roots and unload classes | |
149 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
150 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 151 "stack should be empty by now"); |
152 | |
153 // Follow code cache roots (has to be done after system dictionary, | |
154 // assumes all live klasses are marked) | |
155 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
156 &GenMarkSweep::keep_alive, | |
157 purged_class); | |
941 | 158 GenMarkSweep::follow_stack(); |
342 | 159 |
160 // Update subklass/sibling/implementor links of live klasses | |
161 GenMarkSweep::follow_weak_klass_links(); | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
162 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 163 "stack should be empty by now"); |
164 | |
941 | 165 // Visit memoized MDO's and clear any unmarked weak refs |
166 GenMarkSweep::follow_mdo_weak_refs(); | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
167 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained"); |
941 | 168 |
169 | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
170 // Visit interned string tables and delete unmarked oops |
342 | 171 StringTable::unlink(&GenMarkSweep::is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
172 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
173 SymbolTable::unlink(); |
342 | 174 |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
175 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 176 "stack should be empty by now"); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
177 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
178 if (VerifyDuringGC) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
179 HandleMark hm; // handle scope |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
180 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
181 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
182 Universe::heap()->prepare_for_verify(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
183 // Note: we can verify only the heap here. When an object is |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
184 // marked, the previous value of the mark word (including |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
185 // identity hash values, ages, etc) is preserved, and the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
186 // word is set to markOop::marked_value - effectively removing |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
187 // any hash values from the mark word. These hash values are |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
188 // used when verifying the dictionaries and so removing them |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
189 // from the mark word can make verification of the dictionaries |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
190 // fail. At the end of the GC, the orginal mark word values |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
191 // (including hash values) are restored to the appropriate |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
192 // objects. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
193 Universe::heap()->verify(/* allow dirty */ true, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
194 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
195 /* option */ VerifyOption_G1UseMarkWord); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
196 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
197 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
198 gclog_or_tty->print_cr("]"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
199 } |
342 | 200 } |
201 | |
202 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 203 G1CollectedHeap* _g1h; |
342 | 204 ModRefBarrierSet* _mrbs; |
205 CompactPoint _cp; | |
2152 | 206 HumongousRegionSet _humongous_proxy_set; |
342 | 207 |
208 void free_humongous_region(HeapRegion* hr) { | |
209 HeapWord* end = hr->end(); | |
2361 | 210 size_t dummy_pre_used; |
211 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
212 | |
342 | 213 assert(hr->startsHumongous(), |
214 "Only the start of a humongous region should be freed."); | |
2361 | 215 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
2152 | 216 &_humongous_proxy_set, false /* par */); |
342 | 217 hr->prepare_for_compaction(&_cp); |
218 // Also clear the part of the card table that will be unused after | |
219 // compaction. | |
2152 | 220 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 221 dummy_free_list.remove_all(); |
342 | 222 } |
223 | |
224 public: | |
2152 | 225 G1PrepareCompactClosure(CompactibleSpace* cs) |
226 : _g1h(G1CollectedHeap::heap()), | |
227 _mrbs(G1CollectedHeap::heap()->mr_bs()), | |
342 | 228 _cp(NULL, cs, cs->initialize_threshold()), |
2152 | 229 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
230 | |
231 void update_sets() { | |
232 // We'll recalculate total used bytes and recreate the free list | |
233 // at the end of the GC, so no point in updating those values here. | |
234 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
235 NULL, /* free_list */ | |
236 &_humongous_proxy_set, | |
237 false /* par */); | |
238 } | |
239 | |
342 | 240 bool doHeapRegion(HeapRegion* hr) { |
241 if (hr->isHumongous()) { | |
242 if (hr->startsHumongous()) { | |
243 oop obj = oop(hr->bottom()); | |
244 if (obj->is_gc_marked()) { | |
245 obj->forward_to(obj); | |
246 } else { | |
247 free_humongous_region(hr); | |
248 } | |
249 } else { | |
250 assert(hr->continuesHumongous(), "Invalid humongous."); | |
251 } | |
252 } else { | |
253 hr->prepare_for_compaction(&_cp); | |
254 // Also clear the part of the card table that will be unused after | |
255 // compaction. | |
256 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
257 } | |
258 return false; | |
259 } | |
260 }; | |
677 | 261 |
262 // Finds the first HeapRegion. | |
342 | 263 class FindFirstRegionClosure: public HeapRegionClosure { |
264 HeapRegion* _a_region; | |
265 public: | |
677 | 266 FindFirstRegionClosure() : _a_region(NULL) {} |
342 | 267 bool doHeapRegion(HeapRegion* r) { |
677 | 268 _a_region = r; |
269 return true; | |
342 | 270 } |
271 HeapRegion* result() { return _a_region; } | |
272 }; | |
273 | |
274 void G1MarkSweep::mark_sweep_phase2() { | |
275 // Now all live objects are marked, compute the new object addresses. | |
276 | |
277 // It is imperative that we traverse perm_gen LAST. If dead space is | |
278 // allowed a range of dead object may get overwritten by a dead int | |
279 // array. If perm_gen is not traversed last a klassOop may get | |
280 // overwritten. This is fine since it is dead, but if the class has dead | |
281 // instances we have to skip them, and in order to find their size we | |
282 // need the klassOop! | |
283 // | |
284 // It is not required that we traverse spaces in the same order in | |
285 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
286 // tracking expects us to do so. See comment under phase4. | |
287 | |
288 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
289 Generation* pg = g1h->perm_gen(); | |
290 | |
291 EventMark m("2 compute new addresses"); | |
292 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
293 GenMarkSweep::trace("2"); | |
294 | |
677 | 295 FindFirstRegionClosure cl; |
342 | 296 g1h->heap_region_iterate(&cl); |
297 HeapRegion *r = cl.result(); | |
298 CompactibleSpace* sp = r; | |
299 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
300 sp = r->next_compaction_space(); | |
301 } | |
302 | |
677 | 303 G1PrepareCompactClosure blk(sp); |
342 | 304 g1h->heap_region_iterate(&blk); |
2152 | 305 blk.update_sets(); |
342 | 306 |
307 CompactPoint perm_cp(pg, NULL, NULL); | |
308 pg->prepare_for_compaction(&perm_cp); | |
309 } | |
310 | |
311 class G1AdjustPointersClosure: public HeapRegionClosure { | |
312 public: | |
313 bool doHeapRegion(HeapRegion* r) { | |
314 if (r->isHumongous()) { | |
315 if (r->startsHumongous()) { | |
316 // We must adjust the pointers on the single H object. | |
317 oop obj = oop(r->bottom()); | |
318 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
319 // point all the oops to the new location | |
320 obj->adjust_pointers(); | |
321 debug_only(GenMarkSweep::check_interior_pointers()); | |
322 } | |
323 } else { | |
324 // This really ought to be "as_CompactibleSpace"... | |
325 r->adjust_pointers(); | |
326 } | |
327 return false; | |
328 } | |
329 }; | |
330 | |
331 void G1MarkSweep::mark_sweep_phase3() { | |
332 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
333 Generation* pg = g1h->perm_gen(); | |
334 | |
335 // Adjust the pointers to reflect the new locations | |
336 EventMark m("3 adjust pointers"); | |
337 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
338 GenMarkSweep::trace("3"); | |
339 | |
340 SharedHeap* sh = SharedHeap::heap(); | |
341 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
342 sh->process_strong_roots(true, // activate StrongRootsScope |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
343 true, // Collecting permanent generation. |
342 | 344 SharedHeap::SO_AllClasses, |
345 &GenMarkSweep::adjust_root_pointer_closure, | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
346 NULL, // do not touch code cache here |
342 | 347 &GenMarkSweep::adjust_pointer_closure); |
348 | |
349 g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); | |
350 | |
351 // Now adjust pointers in remaining weak roots. (All of which should | |
352 // have been cleared if they pointed to non-surviving objects.) | |
353 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
354 &GenMarkSweep::adjust_pointer_closure); | |
355 | |
356 GenMarkSweep::adjust_marks(); | |
357 | |
358 G1AdjustPointersClosure blk; | |
359 g1h->heap_region_iterate(&blk); | |
360 pg->adjust_pointers(); | |
361 } | |
362 | |
363 class G1SpaceCompactClosure: public HeapRegionClosure { | |
364 public: | |
365 G1SpaceCompactClosure() {} | |
366 | |
367 bool doHeapRegion(HeapRegion* hr) { | |
368 if (hr->isHumongous()) { | |
369 if (hr->startsHumongous()) { | |
370 oop obj = oop(hr->bottom()); | |
371 if (obj->is_gc_marked()) { | |
372 obj->init_mark(); | |
373 } else { | |
374 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
375 } | |
376 hr->reset_during_compaction(); | |
377 } | |
378 } else { | |
379 hr->compact(); | |
380 } | |
381 return false; | |
382 } | |
383 }; | |
384 | |
385 void G1MarkSweep::mark_sweep_phase4() { | |
386 // All pointers are now adjusted, move objects accordingly | |
387 | |
388 // It is imperative that we traverse perm_gen first in phase4. All | |
389 // classes must be allocated earlier than their instances, and traversing | |
390 // perm_gen first makes sure that all klassOops have moved to their new | |
391 // location before any instance does a dispatch through it's klass! | |
392 | |
393 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
394 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
395 // here (perm_gen first rather than last), so we tell the validate code | |
396 // to use a higher index (saved from phase2) when verifying perm_gen. | |
397 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
398 Generation* pg = g1h->perm_gen(); | |
399 | |
400 EventMark m("4 compact heap"); | |
401 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
402 GenMarkSweep::trace("4"); | |
403 | |
404 pg->compact(); | |
405 | |
406 G1SpaceCompactClosure blk; | |
407 g1h->heap_region_iterate(&blk); | |
408 | |
409 } | |
410 | |
411 // Local Variables: *** | |
412 // c-indentation-style: gnu *** | |
413 // End: *** |