UNIX Kernel--Process Management

A detailed Summary of UNIX Kernel--Process Management

The UNIX system kernel is the master organizer of UNIX. The kernel schedules processes, allocates memory and disk storage, supervises the transmissions of data between the main storage and the peripheral devices, and honors the processes' requests for service. The traditional UNIX system kernel addresses three major tasks: process management; device management; and file management.

These three areas remain central, but dramatic advances in hardware and software have expanded the role of the kernel. Today's kernels usually provide these additional services: virtual memory, networking, and network file systems. Additional kernel features that exist in some versions of UNIX, but that are not universally available include multiprocessor support and lightweight process support.

This paper will focus on process management. This includes starting processes, scheduling processes, swapping processes to disk, allocating resources such as memory and honoring processes' requests for service.

A process is a program that is being executed. For a given program, there may be any number of processes running at a particular time. When we speak of a process, we are talking about something that is active,

something that is executing. The term process generally refers to activities that are cataloged in the UNIX system kernel's process table. The process is the fundamental unit of organization in the UNIX system.

System calls are the second reason that the kernel computer switches from user to kernel mode. System calls that perform I/O operations often lead to a suspension of the calling process while the data is being transferred. A different user process will be executed in the meantime if possible.

The memory on modern computers is not large enough to store all the processes that are active in A UNIX system. The solution is to store some of the suspended processes on a disk. This is known as swapping. A process that is stored on disk must be reloaded into before it can resume execution. Paging is a similar process found on some UNIX systems, where infrequently used parts of processes are temporarily stored on disk.

Some common words found in the essay are:
I/O I/O, Management UNIX, process table, system call, unix system, user table, child process, demise child, kernel mode, user mode kernel, unix system kernel, wait demise child, wait system call, demise child process, processes process, program text, wait system,

Approximate Word count = 1523
Approximate Pages = 6 (250 words per page double spaced)

Category: Technology

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