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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/memory/genMarkSweep.cpp
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@ -162,6 +162,9 @@ void GenMarkSweep::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 to be a better fit, but this will have to do for
// now until we have had a chance to investigate a more optimal setting.
_revisit_mdo_stack = new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(2*size, true);
#ifdef VALIDATE_MARK_SWEEP
if (ValidateMarkSweep) {
@ -206,6 +209,7 @@ void GenMarkSweep::deallocate_stacks() {
delete _marking_stack;
delete _revisit_klass_stack;
delete _revisit_mdo_stack;
#ifdef VALIDATE_MARK_SWEEP
if (ValidateMarkSweep) {
@ -262,6 +266,10 @@ void GenMarkSweep::mark_sweep_phase1(int level,
follow_weak_klass_links();
assert(_marking_stack->is_empty(), "just drained");
// Visit memoized MDO's and clear any 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);
StringTable::unlink(&is_alive);