FreeBSD Process Management

Marshall Kirk McKusick says, kernel-mode resources include those required by the underlying hardware— such as registers, program counter, and stack pointer—and also by the state required for the FreeBSD kernel to provide system services for a process. This kernel state includes parameters to the current system call, the current process’s user identity, scheduling information, and so on. The kernel state for each process is divided into several separate data structures, with two primary structures: the process structure and the user structure. Read more.

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