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  1. JDK
  2. JDK-8280396

G1: Full gc mark stack draining should prefer to make work available to other threads

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    • gc
    • b07

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        G1 full gc marking currently does not preferentially move overflow stack contents to make work available to other threads.

        I.e. if there is a single thread having work in its overflow stack, it tries to work on that one by itself; other threads that steal that have nothing to do as the stack to steal from is kind of empty.

        On BRT 20gb, in the initial full gcs to compact the heap, changing this saves 400ms of 1500ms total pause time.

        This is a similar problem G1 young gc showed long time ago.

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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-8308272 G1: Full gc mark stack draining should prefer to make work available to other threads

            • 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-8310283 G1: Full gc mark stack draining should prefer to make work available to other threads

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

            Enhancement - null JDK-8156754 Encapsulate task queue policies into queue/task specific classes to use

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

            Enhancement - null JDK-8152438 Threads may do significant work out of the non-shared overflow buffer

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8280958 G1/Parallel: Unify marking code structure

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

            Enhancement - null JDK-8280705 Parallel: Full gc mark stack draining should prefer to make work available to other threads

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

            Commit Commit openjdk/jdk17u-dev/24b31cd7

            Commit Commit openjdk/jdk/674a97b2

            Review Review openjdk/jdk17u-dev/1455

            Review Review openjdk/jdk/7175

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                tschatzl Thomas Schatzl
                tschatzl Thomas Schatzl
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