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  1. JDK
  2. JDK-8222145

Add -XX:SoftMaxHeapSize flag

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    • Enhancement
    • Resolution: Fixed
    • P4
    • 13
    • 13
    • hotspot
    • gc
    • b25

    Backports

      Description

        Introduce a manageable SoftMaxHeapSize flag. When set, the GC should strive to not grow heap size beyond the specified size. But as the flag name suggests, this is a soft limit. In other words, the GC is allowed to grow the heap size beyond SoftMaxHeapSize if needed.

        There are a few different use cases where this flag could be useful. For example, when you want to keep the heap footprint down, while maintaining the capability to deal with a temporary increase in heap space requirement. Or when you want to play it safe, with lots of margin, to increase confidence that you will not run into an allocation stall because of an unforeseen increase in allocation rate.

        The SoftMaxHeapSize should not be allowed to be set to a value greater than the max heap size (-Xmx). When not set on the command-line, this flag should default to the max heap size.

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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-8226035 Add -XX:SoftMaxHeapSize flag

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

            Enhancement - null JDK-8222182 ZGC: Use SoftMaxHeapSize to guide GC heuristics

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

            CSR - null JDK-8222181 Add -XX:SoftMaxHeapSize flag

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8222460 -XX:+PrintFlagsRanges prints incorrect range

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

            Enhancement - null JDK-8236073 G1: Use SoftMaxHeapSize to guide GC heuristics

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

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                  Updated:
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