Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
| author | coleenp |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | 377371490991 |
| children | 1216415d8e35 |
| 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 | |
| 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(); | |
|
2147
9afee0b9fc1d
7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220)
kamg
parents:
1972
diff
changeset
|
116 JvmtiExport::gc_epilogue(); |
| 342 | 117 |
| 118 // refs processing: clean slate | |
| 119 GenMarkSweep::_ref_processor = NULL; | |
| 120 } | |
| 121 | |
| 122 | |
| 123 void G1MarkSweep::allocate_stacks() { | |
| 124 GenMarkSweep::_preserved_count_max = 0; | |
| 125 GenMarkSweep::_preserved_marks = NULL; | |
| 126 GenMarkSweep::_preserved_count = 0; | |
| 127 } | |
| 128 | |
| 129 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 130 bool clear_all_softrefs) { | |
| 131 // Recursively traverse all live objects and mark them | |
| 132 EventMark m("1 mark object"); | |
| 133 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
| 134 GenMarkSweep::trace(" 1"); | |
| 135 | |
| 136 SharedHeap* sh = SharedHeap::heap(); | |
| 137 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
138 sh->process_strong_roots(true, // activeate StrongRootsScope |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
139 true, // Collecting permanent generation. |
| 342 | 140 SharedHeap::SO_SystemClasses, |
| 141 &GenMarkSweep::follow_root_closure, | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
142 &GenMarkSweep::follow_code_root_closure, |
| 342 | 143 &GenMarkSweep::follow_root_closure); |
| 144 | |
| 145 // Process reference objects found during marking | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
146 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
147 rp->setup_policy(clear_all_softrefs); |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
148 rp->process_discovered_references(&GenMarkSweep::is_alive, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
149 &GenMarkSweep::keep_alive, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
150 &GenMarkSweep::follow_stack_closure, |
|
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
151 NULL); |
| 342 | 152 |
| 153 // Follow system dictionary roots and unload classes | |
| 154 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
|
155 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 156 "stack should be empty by now"); |
| 157 | |
| 158 // Follow code cache roots (has to be done after system dictionary, | |
| 159 // assumes all live klasses are marked) | |
| 160 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
| 161 &GenMarkSweep::keep_alive, | |
| 162 purged_class); | |
| 941 | 163 GenMarkSweep::follow_stack(); |
| 342 | 164 |
| 165 // Update subklass/sibling/implementor links of live klasses | |
| 166 GenMarkSweep::follow_weak_klass_links(); | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
167 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 168 "stack should be empty by now"); |
| 169 | |
| 941 | 170 // Visit memoized MDO's and clear any unmarked weak refs |
| 171 GenMarkSweep::follow_mdo_weak_refs(); | |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
172 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained"); |
| 941 | 173 |
| 174 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
175 // Visit interned string tables and delete unmarked oops |
| 342 | 176 StringTable::unlink(&GenMarkSweep::is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
177 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2153
diff
changeset
|
178 SymbolTable::unlink(); |
| 342 | 179 |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
180 assert(GenMarkSweep::_marking_stack.is_empty(), |
| 342 | 181 "stack should be empty by now"); |
| 182 } | |
| 183 | |
| 184 class G1PrepareCompactClosure: public HeapRegionClosure { | |
| 2152 | 185 G1CollectedHeap* _g1h; |
| 342 | 186 ModRefBarrierSet* _mrbs; |
| 187 CompactPoint _cp; | |
| 2152 | 188 size_t _pre_used; |
| 189 FreeRegionList _free_list; | |
| 190 HumongousRegionSet _humongous_proxy_set; | |
| 342 | 191 |
| 192 void free_humongous_region(HeapRegion* hr) { | |
| 193 HeapWord* end = hr->end(); | |
| 194 assert(hr->startsHumongous(), | |
| 195 "Only the start of a humongous region should be freed."); | |
| 2152 | 196 _g1h->free_humongous_region(hr, &_pre_used, &_free_list, |
| 197 &_humongous_proxy_set, false /* par */); | |
| 198 // Do we also need to do this for the continues humongous regions | |
| 199 // we just collapsed? | |
| 342 | 200 hr->prepare_for_compaction(&_cp); |
| 201 // Also clear the part of the card table that will be unused after | |
| 202 // compaction. | |
| 2152 | 203 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
| 342 | 204 } |
| 205 | |
| 206 public: | |
| 2152 | 207 G1PrepareCompactClosure(CompactibleSpace* cs) |
| 208 : _g1h(G1CollectedHeap::heap()), | |
| 209 _mrbs(G1CollectedHeap::heap()->mr_bs()), | |
| 342 | 210 _cp(NULL, cs, cs->initialize_threshold()), |
| 2152 | 211 _pre_used(0), |
| 212 _free_list("Local Free List for G1MarkSweep"), | |
| 213 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } | |
| 214 | |
| 215 void update_sets() { | |
| 216 // We'll recalculate total used bytes and recreate the free list | |
| 217 // at the end of the GC, so no point in updating those values here. | |
| 218 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
| 219 NULL, /* free_list */ | |
| 220 &_humongous_proxy_set, | |
| 221 false /* par */); | |
| 222 _free_list.remove_all(); | |
| 223 } | |
| 224 | |
| 342 | 225 bool doHeapRegion(HeapRegion* hr) { |
| 226 if (hr->isHumongous()) { | |
| 227 if (hr->startsHumongous()) { | |
| 228 oop obj = oop(hr->bottom()); | |
| 229 if (obj->is_gc_marked()) { | |
| 230 obj->forward_to(obj); | |
| 231 } else { | |
| 232 free_humongous_region(hr); | |
| 233 } | |
| 234 } else { | |
| 235 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 236 } | |
| 237 } else { | |
| 238 hr->prepare_for_compaction(&_cp); | |
| 239 // Also clear the part of the card table that will be unused after | |
| 240 // compaction. | |
| 241 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
| 242 } | |
| 243 return false; | |
| 244 } | |
| 245 }; | |
| 677 | 246 |
| 247 // Finds the first HeapRegion. | |
| 342 | 248 class FindFirstRegionClosure: public HeapRegionClosure { |
| 249 HeapRegion* _a_region; | |
| 250 public: | |
| 677 | 251 FindFirstRegionClosure() : _a_region(NULL) {} |
| 342 | 252 bool doHeapRegion(HeapRegion* r) { |
| 677 | 253 _a_region = r; |
| 254 return true; | |
| 342 | 255 } |
| 256 HeapRegion* result() { return _a_region; } | |
| 257 }; | |
| 258 | |
| 259 void G1MarkSweep::mark_sweep_phase2() { | |
| 260 // Now all live objects are marked, compute the new object addresses. | |
| 261 | |
| 262 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 263 // allowed a range of dead object may get overwritten by a dead int | |
| 264 // array. If perm_gen is not traversed last a klassOop may get | |
| 265 // overwritten. This is fine since it is dead, but if the class has dead | |
| 266 // instances we have to skip them, and in order to find their size we | |
| 267 // need the klassOop! | |
| 268 // | |
| 269 // It is not required that we traverse spaces in the same order in | |
| 270 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 271 // tracking expects us to do so. See comment under phase4. | |
| 272 | |
| 273 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 274 Generation* pg = g1h->perm_gen(); | |
| 275 | |
| 276 EventMark m("2 compute new addresses"); | |
| 277 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
| 278 GenMarkSweep::trace("2"); | |
| 279 | |
| 677 | 280 FindFirstRegionClosure cl; |
| 342 | 281 g1h->heap_region_iterate(&cl); |
| 282 HeapRegion *r = cl.result(); | |
| 283 CompactibleSpace* sp = r; | |
| 284 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
| 285 sp = r->next_compaction_space(); | |
| 286 } | |
| 287 | |
| 677 | 288 G1PrepareCompactClosure blk(sp); |
| 342 | 289 g1h->heap_region_iterate(&blk); |
| 2152 | 290 blk.update_sets(); |
| 342 | 291 |
| 292 CompactPoint perm_cp(pg, NULL, NULL); | |
| 293 pg->prepare_for_compaction(&perm_cp); | |
| 294 } | |
| 295 | |
| 296 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 297 public: | |
| 298 bool doHeapRegion(HeapRegion* r) { | |
| 299 if (r->isHumongous()) { | |
| 300 if (r->startsHumongous()) { | |
| 301 // We must adjust the pointers on the single H object. | |
| 302 oop obj = oop(r->bottom()); | |
| 303 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
| 304 // point all the oops to the new location | |
| 305 obj->adjust_pointers(); | |
| 306 debug_only(GenMarkSweep::check_interior_pointers()); | |
| 307 } | |
| 308 } else { | |
| 309 // This really ought to be "as_CompactibleSpace"... | |
| 310 r->adjust_pointers(); | |
| 311 } | |
| 312 return false; | |
| 313 } | |
| 314 }; | |
| 315 | |
| 316 void G1MarkSweep::mark_sweep_phase3() { | |
| 317 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 318 Generation* pg = g1h->perm_gen(); | |
| 319 | |
| 320 // Adjust the pointers to reflect the new locations | |
| 321 EventMark m("3 adjust pointers"); | |
| 322 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
| 323 GenMarkSweep::trace("3"); | |
| 324 | |
| 325 SharedHeap* sh = SharedHeap::heap(); | |
| 326 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
327 sh->process_strong_roots(true, // activate StrongRootsScope |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
328 true, // Collecting permanent generation. |
| 342 | 329 SharedHeap::SO_AllClasses, |
| 330 &GenMarkSweep::adjust_root_pointer_closure, | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
331 NULL, // do not touch code cache here |
| 342 | 332 &GenMarkSweep::adjust_pointer_closure); |
| 333 | |
| 334 g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); | |
| 335 | |
| 336 // Now adjust pointers in remaining weak roots. (All of which should | |
| 337 // have been cleared if they pointed to non-surviving objects.) | |
| 338 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
| 339 &GenMarkSweep::adjust_pointer_closure); | |
| 340 | |
| 341 GenMarkSweep::adjust_marks(); | |
| 342 | |
| 343 G1AdjustPointersClosure blk; | |
| 344 g1h->heap_region_iterate(&blk); | |
| 345 pg->adjust_pointers(); | |
| 346 } | |
| 347 | |
| 348 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 349 public: | |
| 350 G1SpaceCompactClosure() {} | |
| 351 | |
| 352 bool doHeapRegion(HeapRegion* hr) { | |
| 353 if (hr->isHumongous()) { | |
| 354 if (hr->startsHumongous()) { | |
| 355 oop obj = oop(hr->bottom()); | |
| 356 if (obj->is_gc_marked()) { | |
| 357 obj->init_mark(); | |
| 358 } else { | |
| 359 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 360 } | |
| 361 hr->reset_during_compaction(); | |
| 362 } | |
| 363 } else { | |
| 364 hr->compact(); | |
| 365 } | |
| 366 return false; | |
| 367 } | |
| 368 }; | |
| 369 | |
| 370 void G1MarkSweep::mark_sweep_phase4() { | |
| 371 // All pointers are now adjusted, move objects accordingly | |
| 372 | |
| 373 // It is imperative that we traverse perm_gen first in phase4. All | |
| 374 // classes must be allocated earlier than their instances, and traversing | |
| 375 // perm_gen first makes sure that all klassOops have moved to their new | |
| 376 // location before any instance does a dispatch through it's klass! | |
| 377 | |
| 378 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 379 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
| 380 // here (perm_gen first rather than last), so we tell the validate code | |
| 381 // to use a higher index (saved from phase2) when verifying perm_gen. | |
| 382 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 383 Generation* pg = g1h->perm_gen(); | |
| 384 | |
| 385 EventMark m("4 compact heap"); | |
| 386 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
| 387 GenMarkSweep::trace("4"); | |
| 388 | |
| 389 pg->compact(); | |
| 390 | |
| 391 G1SpaceCompactClosure blk; | |
| 392 g1h->heap_region_iterate(&blk); | |
| 393 | |
| 394 } | |
| 395 | |
| 396 // Local Variables: *** | |
| 397 // c-indentation-style: gnu *** | |
| 398 // End: *** |