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  1. JDK
  2. JDK-8140326

G1: Consider putting regions where evacuation failed into next collection set

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    • gc
    • b10

    Description

      A common case in evacuation failure is that only a very small subset of the original contents of the region experiencing the failure is live.
      We mark the region as old and basically completely full.

      This is a waste of space. A following GC could clean them out cheaply in many cases.

      May also be very interesting in case of pinned regions, i.e. clean the affected regions out in the next gc.

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          is blocked by

          Enhancement - null JDK-8306920 G1: Calculate garbage bytes for evacuation failed regions from marked live bytes

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8314157 G1: "yielded" is not initialized on some paths after JDK-8140326

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8315501 G1: Do not require marking region evacuation in Prepare Mixed GC

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

          Enhancement - null JDK-8300770 G1: Allow optional code root memregions

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

          Enhancement - null JDK-8314884 G1: Exclude eager reclaim candidates from marking

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

          Enhancement - null JDK-8306541 Refactor collection set candidate handling to prepare for JDK-8140326

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

          Enhancement - null JDK-8315502 G1: Abort mixed phase if Prepare Mixed cleaned out all marking regions

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

          Enhancement - null JDK-8315686 G1: Disallow evacuation of marking regions in a Prepare Mixed gc

          • 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

          Enhancement - null JDK-8251288 G1: Young gen sizing should take short-living humongous object allocation into account

          • 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.
          • Closed
          links to

          Commit Commit openjdk/jdk/7e209528

          Review Review openjdk/jdk/14220

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              tschatzl Thomas Schatzl
              tschatzl Thomas Schatzl
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                Created:
                Updated:
                Resolved: