Question: If a user program needs to perform I/O, it needs to trap the OS via a system call that transfers control to the kernel. The

If a user program needs to perform I/O, it needs to trap the OS via a system call that transfers control to the kernel. The kernel performs I/O on behalf of the user program. However, systems calls have added overheads, which can slow down the entire system. In that case, why not let user processes perform I/O directly, without going through the kernel?

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