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  1. JDK
  2. JDK-8043605

Enable history for empty property maps

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: core-libs
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b17
    • CPU:
      generic
    • OS:
      generic

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        Description

        JDK-8011540 disabled retaining of history for empty property maps. This unfortunately has the effect of creating a lot of new, semantically identical maps when an object's properties are populated dynamically (e.g. by reading key-value pairs from an array etc.) and thus subsequently producing megamorphic call sites. The histories are held as maps of (property->propertyMap), with properties held weakly and property maps held softly. These maps are mostly strongly held by other parts of the system, so they don't contribute to the memory pressure; the only thing contributing is the memory for the map itself.

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                Assignee:
                attila Attila Szegedi
                Reporter:
                attila Attila Szegedi
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                  Updated:
                  Resolved: