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  1. JDK
  2. JDK-8278917

Use Prev Bitmap for recording evac failed objects

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    • gc
    • b03

    Description

      Currently the evacuation failure handling is recording the failed objects during evacuation in a set backed by G1SegmentedArray. Later when processing the objects the set needs to be sorted to allow for efficient zapping of the areas between the live objects. During this phase we also mark the live objects in the prev mark bitmap to allow for correct verification.

      We can optimize away the sorting part mention above by directly mark failing objects in the mark bitmap and use the marks to know which objects needs processing.

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          relates to

          Enhancement - null JDK-8254739 G1: Optimize evacuation failure for regions with few failed objects

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-7162317 G1: Explicitly mark self-forwarded objects during marking cycles

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          JEP - Java Enhancement Proposal JDK-8276094 JEP 423: Region Pinning for G1

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Integrated

          Bug - A problem which impairs or prevents the functions of the product. JDK-8283188 Build time regression caused by JDK-8278917

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8289598 Investigate use of bulk bit clearing during G1 Full GC

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8256265 G1: Improve parallelism in regions that failed evacuation

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          links to

          Commit Commit openjdk/jdk/f4f2f32c

          Review Review openjdk/jdk/6867

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              sjohanss Stefan Johansson
              sjohanss Stefan Johansson
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