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4957990: Perm heap bloat in JVM

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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
This commit is contained in:
Y. Srinivas Ramakrishna 2009-09-02 00:04:29 -07:00
parent 2491751525
commit c6763b5bad
27 changed files with 385 additions and 65 deletions
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8
hotspot/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp
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@ -482,6 +482,9 @@ void PSMarkSweep::allocate_stacks() {
int size = SystemDictionary::number_of_classes() * 2;
_revisit_klass_stack = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true);
// (#klass/k)^2, for k ~ 10 appears a better setting, but this will have to do for
// now until we investigate a more optimal setting.
_revisit_mdo_stack = new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true);
}
@ -495,6 +498,7 @@ void PSMarkSweep::deallocate_stacks() {
delete _marking_stack;
delete _revisit_klass_stack;
delete _revisit_mdo_stack;
}
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
@ -540,6 +544,10 @@ void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
follow_weak_klass_links();
assert(_marking_stack->is_empty(), "just drained");
// Visit memoized mdo's and clear unmarked weak refs
follow_mdo_weak_refs();
assert(_marking_stack->is_empty(), "just drained");
// Visit symbol and interned string tables and delete unmarked oops
SymbolTable::unlink(is_alive_closure());
StringTable::unlink(is_alive_closure());