In this project, you will add a (self-proclaimed) priority attribute to xv6 processes. The priority does not actually do anything (yet), we're just keeping track of it. The initial process should start with a priority of 10, but just like I/O streams, new processes should inherit the priority of the parent process. That is, if the parent process had a priority of 15, the child process should start with a priority of 15. Much of your effort will be spent understanding xv6 code. You should not need to write very much new code. (See below for the suggested order and other hints.) Create a system call: int priority(int pid, int priority) to allow manipulating the priority of a process. When called with pid:.

Priority programming is a process programming method based on priority. In this technique, the developer chooses the tasks to work according to priority, which is different from other types of programming, for example, a simple round-robin.

On UNIX and many other systems, higher priority values represent lower priority processes. Some of the systems, such as Windows, use the opposite convention: a higher number means a higher priority

Priorities can be dynamic or static. Static priorities are assigned during creation, while dynamic priorities are assigned according to the behavior of the processes while they are in the system. To illustrate, the planner could favor intensive input / output (I / O) tasks, allowing expensive requests to be issued as soon as possible.

Priorities can be defined internally or externally. Internally defined priorities make use of a measurable amount to calculate the priority of a given process. On the contrary, external priorities are defined using criteria beyond the operating system (OS), which may include the importance of the process, the type and sum of the resources used for the use of the computer, user preferences , trade and other factors such as politics etc.

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