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checkKernelVersion() — netty Function Reference

Architecture documentation for the checkKernelVersion() function in Native.java from the netty codebase.

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Dependency Diagram

graph TD
  a74add10_7c33_7e0b_e95e_24e58b29e4b9["checkKernelVersion()"]
  6ddaf968_1eb9_8057_3938_2ad6d5ebbbeb["Native"]
  a74add10_7c33_7e0b_e95e_24e58b29e4b9 -->|defined in| 6ddaf968_1eb9_8057_3938_2ad6d5ebbbeb
  style a74add10_7c33_7e0b_e95e_24e58b29e4b9 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

transport-classes-io_uring/src/main/java/io/netty/channel/uring/Native.java lines 517–530

    static void checkKernelVersion(String kernelVersion) {
        boolean enforceKernelVersion = SystemPropertyUtil.getBoolean(
                "io.netty.transport.iouring.enforceKernelVersion", true);
        boolean kernelSupported = checkKernelVersion(kernelVersion, 5, 9);
        if (!kernelSupported) {
            if (enforceKernelVersion) {
                throw new UnsupportedOperationException(
                        "you need at least kernel version 5.9, current kernel version: " + kernelVersion);
            } else {
                logger.debug("Detected kernel " + kernelVersion + " does not match minimum version of 5.9, " +
                        "trying to use io_uring anyway");
            }
        }
    }

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Frequently Asked Questions

What does checkKernelVersion() do?
checkKernelVersion() is a function in the netty codebase, defined in transport-classes-io_uring/src/main/java/io/netty/channel/uring/Native.java.
Where is checkKernelVersion() defined?
checkKernelVersion() is defined in transport-classes-io_uring/src/main/java/io/netty/channel/uring/Native.java at line 517.

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