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  1. JDK
  2. JDK-8173227

[JVMCI] HotSpotJVMCIMetaAccessContext.fromClass is inefficient

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b157

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        Description

        HotSpotJVMCIMetaAccessContext.createClass is a synchronized wrapper around a WeakHashMap with WeakReference values. During bytecode parsing this can be a heavy contention point between between multiple threads. Additionally the use of WeakReferences for the keys and values is expensive. A ClassValue<WeakReference<ResolvedJavaType>> would avoid the contention around the synchronized method and would eliminate one of the two required WeakReferences.

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                • Assignee:
                  never Tom Rodriguez
                  Reporter:
                  never Tom Rodriguez
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                    Updated:
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