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  1. JDK
  2. JDK-8321075

RISC-V: UseSystemMemoryBarrier lacking proper OS support

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    • b11
    • riscv
    • linux

    Backports

      Description

        Linux risc-v port is lacking correct barriers in the kernel for the membarrier() syscall to actually have the correct semantic in user-space.

        https://lore.kernel.org/lkml/041c83e6-1ca5-4953-bcec-03571135165d@efficios.com/

        UseSystemMemoryBarrier should not be allowed to turned on when running on Linux/RV.

        There is no way telling from the syscall if this is on non-working kernel or a post 6.6 (cross-fingers it get fixed to 6.7) with a working syscall.
        The linux membarrier wrapper should probably be informed on the current kernel version to determine if it's usable or not.

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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-8327528 RISC-V: UseSystemMemoryBarrier lacking proper OS support

            • 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-8327820 RISC-V: UseSystemMemoryBarrier lacking proper OS support

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

            Enhancement - null JDK-8292591 Experimentally add back barrier-less Java thread transitions

            • 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-8329961 Buffer overflow in os::Linux::kernel_version

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

            Commit Commit openjdk/jdk21u-dev/d4e336d4

            Commit Commit openjdk/jdk22u/cebe57d4

            Commit Commit openjdk/jdk/68eb5a1d

            Review Review openjdk/jdk21u-dev/294

            Review Review openjdk/jdk22u/83

            Review Review openjdk/jdk/17889

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                rehn Robbin Ehn
                rehn Robbin Ehn
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                  Created:
                  Updated:
                  Resolved: