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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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16
hotspot/src/share/vm/gc_implementation/g1/g1MarkSweep.cpp
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@ -102,9 +102,14 @@ void G1MarkSweep::allocate_stacks() {
GenMarkSweep::_marking_stack =
new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true);
size_t size = SystemDictionary::number_of_classes() * 2;
int size = SystemDictionary::number_of_classes() * 2;
GenMarkSweep::_revisit_klass_stack =
new (ResourceObj::C_HEAP) GrowableArray<Klass*>((int)size, true);
new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true);
// (#klass/k)^2 for k ~ 10 appears a better fit, but this will have to do
// for now until we have a chance to work out a more optimal setting.
GenMarkSweep::_revisit_mdo_stack =
new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true);
}
void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
@ -139,13 +144,18 @@ void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
CodeCache::do_unloading(&GenMarkSweep::is_alive,
&GenMarkSweep::keep_alive,
purged_class);
GenMarkSweep::follow_stack();
GenMarkSweep::follow_stack();
// Update subklass/sibling/implementor links of live klasses
GenMarkSweep::follow_weak_klass_links();
assert(GenMarkSweep::_marking_stack->is_empty(),
"stack should be empty by now");
// Visit memoized MDO's and clear any unmarked weak refs
GenMarkSweep::follow_mdo_weak_refs();
assert(GenMarkSweep::_marking_stack->is_empty(), "just drained");
// Visit symbol and interned string tables and delete unmarked oops
SymbolTable::unlink(&GenMarkSweep::is_alive);
StringTable::unlink(&GenMarkSweep::is_alive);