Mercurial > hg > graal-jvmci-8
diff src/share/vm/memory/referencePolicy.hpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Thu, 20 Nov 2008 16:56:09 -0800 |
parents | a61af66fc99e |
children | 27a80744a83b |
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--- a/src/share/vm/memory/referencePolicy.hpp Thu Nov 20 12:27:41 2008 -0800 +++ b/src/share/vm/memory/referencePolicy.hpp Thu Nov 20 16:56:09 2008 -0800 @@ -26,9 +26,11 @@ // should be cleared. -class ReferencePolicy : public ResourceObj { +class ReferencePolicy : public CHeapObj { public: virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } + // Capture state (of-the-VM) information needed to evaluate the policy + virtual void snap() { /* do nothing */ } }; class NeverClearPolicy : public ReferencePolicy { @@ -48,6 +50,8 @@ public: LRUCurrentHeapPolicy(); + // Capture state (of-the-VM) information needed to evaluate the policy + void snap(); bool should_clear_reference(oop p); }; @@ -58,5 +62,7 @@ public: LRUMaxHeapPolicy(); + // Capture state (of-the-VM) information needed to evaluate the policy + void snap(); bool should_clear_reference(oop p); };