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comparison src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 941:8b46c4d82093

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4957990: Perm heap bloat in JVM Summary: Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately. Reviewed-by: jcoomes, jmasa, kvn, never
author ysr
date Wed, 02 Sep 2009 00:04:29 -0700
parents 7bb995fbd3c0
children 54b3b351d6f9
comparison
equal deleted inserted replaced
940:8624da129f0b 941:8b46c4d82093
480 480
481 _marking_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); 481 _marking_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true);
482 482
483 int size = SystemDictionary::number_of_classes() * 2; 483 int size = SystemDictionary::number_of_classes() * 2;
484 _revisit_klass_stack = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true); 484 _revisit_klass_stack = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true);
485 // (#klass/k)^2, for k ~ 10 appears a better setting, but this will have to do for
486 // now until we investigate a more optimal setting.
487 _revisit_mdo_stack = new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true);
485 } 488 }
486 489
487 490
488 void PSMarkSweep::deallocate_stacks() { 491 void PSMarkSweep::deallocate_stacks() {
489 if (_preserved_oop_stack) { 492 if (_preserved_oop_stack) {
493 _preserved_oop_stack = NULL; 496 _preserved_oop_stack = NULL;
494 } 497 }
495 498
496 delete _marking_stack; 499 delete _marking_stack;
497 delete _revisit_klass_stack; 500 delete _revisit_klass_stack;
501 delete _revisit_mdo_stack;
498 } 502 }
499 503
500 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { 504 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
501 // Recursively traverse all live objects and mark them 505 // Recursively traverse all live objects and mark them
502 EventMark m("1 mark object"); 506 EventMark m("1 mark object");
536 purged_class); 540 purged_class);
537 follow_stack(); // Flush marking stack 541 follow_stack(); // Flush marking stack
538 542
539 // Update subklass/sibling/implementor links of live klasses 543 // Update subklass/sibling/implementor links of live klasses
540 follow_weak_klass_links(); 544 follow_weak_klass_links();
545 assert(_marking_stack->is_empty(), "just drained");
546
547 // Visit memoized mdo's and clear unmarked weak refs
548 follow_mdo_weak_refs();
541 assert(_marking_stack->is_empty(), "just drained"); 549 assert(_marking_stack->is_empty(), "just drained");
542 550
543 // Visit symbol and interned string tables and delete unmarked oops 551 // Visit symbol and interned string tables and delete unmarked oops
544 SymbolTable::unlink(is_alive_closure()); 552 SymbolTable::unlink(is_alive_closure());
545 StringTable::unlink(is_alive_closure()); 553 StringTable::unlink(is_alive_closure());