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  1. JDK
  2. JDK-8279856

Parallel: Use PreservedMarks to record promotion-failed objects

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    • gc
    • b08

    Backports

      Description

        At the end of a Young-GC, we walk the whole young-gen to find promotion-failed objs.

        ```
        void PSScavenge::clean_up_failed_promotion() {
          ...
          RemoveForwardedPointerClosure remove_fwd_ptr_closure;
          young_gen->object_iterate(&remove_fwd_ptr_closure);
          ...
        }
        ```

        This can be quite expensive, especially #promotion-failed objs is ususally small if any.

        An alternative is to use `PreservedMarks` to record those promotion-failed objs. (`PreservedMarks` is originally used for objs whose markWord must be preserved, `markWord::must_be_preserved`.)

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8320514 Parallel: Use PreservedMarks to record promotion-failed objects

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

            Enhancement - null JDK-8281035 Serial: Move RemoveForwardedPointerClosure to local scope

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

            Enhancement - null JDK-8254167 G1: Record regions where evacuation failed to provide targeted iteration

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

            Commit Commit openjdk/jdk17u-dev/40c29f7d

            Commit Commit openjdk/jdk/16ec47d5

            Review Review openjdk/jdk17u-dev/1964

            Review Review openjdk/jdk/7028

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                ayang Albert Yang
                ayang Albert Yang
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