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  1. JDK
  2. JDK-8277137

Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

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    • b25
    • aarch64

    Backports

      Description

        According to perf data, setting OnSpinWaitInst/OnSpinWaitInstCount to "isb"/1 improves performance workloads on Graviton 2(Arm Neoverse N1 implementation) which use Thread.onSpinWait. See https://git.openjdk.java.net/jdk/pull/5562 for details. So they should be used as defaults on Arm Neoverse N1.

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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-8280405 Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

            • 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-8298925 Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

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

            Enhancement - null JDK-8258604 Use 'isb' instruction in SpinPause on linux-aarch64

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

            Enhancement - null JDK-8186670 Implement _onSpinWait() intrinsic for AArch64

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8277503 compiler/onSpinWait/TestOnSpinWaitAArch64DefaultFlags.java failed with "OnSpinWaitInst with the expected value 'isb' not found."

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

            Commit Commit openjdk/jdk17u-dev/fe1d8e99

            Commit Commit openjdk/jdk/38345bd2

            Review Review openjdk/jdk17u-dev/103

            Review Review openjdk/jdk/6415

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                eastigeevich Evgeny Astigeevich
                eastigeevich Evgeny Astigeevich
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                  Updated:
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