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  1. JDK
  2. JDK-8328075

Shenandoah: Avoid forwarding when objects don't move in full-GC

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    • gc
    • b15
    • generic
    • generic

    Backports

      Description

        Currently, in Shenandoah's full-GC, we forward all marked objects (and preserve their headers), even if they don't move. This typically happens for a certain amount of 'sediment' that accumulates at the bottom of the heap. This results in wasted CPU cycles and memory accesses and usage. It can easily be avoided by not forwarding objects that don't move.

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            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-8333110 Shenandoah: Avoid forwarding when objects don't move in full-GC

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

            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-8333305 Shenandoah: Avoid forwarding when objects don't move in full-GC

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

            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-8333368 Shenandoah: Avoid forwarding when objects don't move in full-GC

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

            Commit Commit openjdk/jdk17u-dev/235baaae

            Commit Commit openjdk/jdk21u-dev/dc8b95fb

            Commit Commit openjdk/jdk22u/70bd2c74

            Commit Commit openjdk/jdk/80ccc989

            Review Review openjdk/jdk17u-dev/2474

            Review Review openjdk/jdk21u-dev/575

            Review Review openjdk/jdk22u/205

            Review Review openjdk/jdk/18280

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                rkennke Roman Kennke
                rkennke Roman Kennke
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                  Created:
                  Updated:
                  Resolved: