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  1. JDK
  2. JDK-8129558

Coalesce dead objects during removal of self-forwarded pointers

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Subcomponent:
      gc
    • Resolved In Build:
      b74

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        Description

        During fixing up self-forwarded pointers created by evacuation failure we walk the heap object by object, fixing up BOT, mark bitmap object by object, both for dead and live objects.

        It would be a lot faster to coalesce dead objects into single filler objects and do the BOT update/mark bitmap work on that scale. This significantly reduces the number of updates, increasing performance.

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                • Assignee:
                  tschatzl Thomas Schatzl
                  Reporter:
                  tschatzl Thomas Schatzl
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                  • Created:
                    Updated:
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