Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 894b1d7c7e01 |
| children | 9afee0b9fc1d 0fa27f37d4d4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
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 * | |
|
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 | |
| 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(); | |
|
358
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
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 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
137 sh->process_strong_roots(true, // activeate StrongRootsScope |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
138 true, // Collecting permanent generation. |
| 342 | 139 SharedHeap::SO_SystemClasses, |
| 140 &GenMarkSweep::follow_root_closure, | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
141 &GenMarkSweep::follow_code_root_closure, |
| 342 | 142 &GenMarkSweep::follow_root_closure); |
| 143 | |
| 144 // Process reference objects found during marking | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
145 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
146 rp->setup_policy(clear_all_softrefs); |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
147 rp->process_discovered_references(&GenMarkSweep::is_alive, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
148 &GenMarkSweep::keep_alive, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
149 &GenMarkSweep::follow_stack_closure, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
150 NULL); |
| 342 | 151 |
| 152 // Follow system dictionary roots and unload classes | |
| 153 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
|
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(); | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
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(); | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
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 | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
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 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
304 sh->process_strong_roots(true, // activate StrongRootsScope |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
305 true, // Collecting permanent generation. |
| 342 | 306 SharedHeap::SO_AllClasses, |
| 307 &GenMarkSweep::adjust_root_pointer_closure, | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
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: *** |