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  1. JDK
  2. JDK-8241351

Shenandoah: fragmentation metrics overhaul

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    • gc
    • b16

    Backports

      Description

        Current fragmentation computations have flaws:
         - fragmentation metrics are there to drive mutator behavior, but it captures evac-reserve;
         - external fragmentation do not count humongous objects spanning a single region
         - external fragmentation takes "total space" over all regions, while using "free space" only for completely empty ones

        These make gc/oom/TestThreadFailure.java fail with JDK-8241139 changes.

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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-8243263 Shenandoah: fragmentation metrics overhaul

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8241139 Shenandoah: distribute mark-compact work exactly to minimize fragmentation

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

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: