Mercurial > hg > truffle
diff src/share/vm/memory/genMarkSweep.cpp @ 941:8b46c4d82093
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 | 27a80744a83b |
| children | 89e0543e1737 54b3b351d6f9 |
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--- a/src/share/vm/memory/genMarkSweep.cpp Mon Aug 31 05:27:29 2009 -0700 +++ b/src/share/vm/memory/genMarkSweep.cpp Wed Sep 02 00:04:29 2009 -0700 @@ -162,6 +162,9 @@ 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 @@ delete _marking_stack; delete _revisit_klass_stack; + delete _revisit_mdo_stack; #ifdef VALIDATE_MARK_SWEEP if (ValidateMarkSweep) { @@ -262,6 +266,10 @@ 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);