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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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15
hotspot/src/share/vm/gc_implementation/shared/markSweep.hpp
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@ -23,6 +23,7 @@
*/
class ReferenceProcessor;
class DataLayout;
// MarkSweep takes care of global mark-compact garbage collection for a
// GenCollectedHeap using a four-phase pointer forwarding algorithm. All
@ -65,6 +66,8 @@ class MarkSweep : AllStatic {
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p);
virtual const bool do_nmethods() const { return true; }
virtual const bool should_remember_mdo() const { return true; }
virtual void remember_mdo(DataLayout* p) { MarkSweep::revisit_mdo(p); }
};
class FollowStackClosure: public VoidClosure {
@ -103,6 +106,7 @@ class MarkSweep : AllStatic {
friend class KeepAliveClosure;
friend class VM_MarkSweep;
friend void marksweep_init();
friend class DataLayout;
//
// Vars
@ -112,6 +116,8 @@ class MarkSweep : AllStatic {
static GrowableArray<oop>* _marking_stack;
// Stack for live klasses to revisit at end of marking phase
static GrowableArray<Klass*>* _revisit_klass_stack;
// Set (stack) of MDO's to revisit at end of marking phase
static GrowableArray<DataLayout*>* _revisit_mdo_stack;
// Space for storing/restoring mark word
static GrowableArray<markOop>* _preserved_mark_stack;
@ -157,6 +163,10 @@ class MarkSweep : AllStatic {
// Class unloading. Update subklass/sibling/implementor links at end of marking phase.
static void follow_weak_klass_links();
// Class unloading. Clear weak refs in MDO's (ProfileData)
// at the end of the marking phase.
static void follow_mdo_weak_refs();
// Debugging
static void trace(const char* msg) PRODUCT_RETURN;
@ -213,7 +223,10 @@ class MarkSweep : AllStatic {
#endif
// Call backs for class unloading
static void revisit_weak_klass_link(Klass* k); // Update subklass/sibling/implementor links at end of marking.
// Update subklass/sibling/implementor links at end of marking.
static void revisit_weak_klass_link(Klass* k);
// For weak refs clearing in MDO's
static void revisit_mdo(DataLayout* p);
};
class PreservedMark VALUE_OBJ_CLASS_SPEC {