Duty of Operating System
Duration: 4 min
This video lesson is available to enrolled students.
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The video lecture provides a comprehensive overview of the "Duty of Operating System" specifically concerning memory management. The instructor begins by outlining three critical responsibilities that the OS must handle. These include performing address translation from logical to physical addresses, deciding which processes and data move into and out of memory while allocating space, and keeping track of currently used memory parts to ensure efficient allocation and deallocation. He then transitions to a new slide that elaborates on the first duty, introducing the concept of storing processes in main memory through two distinct approaches: contiguous allocation policy and non-contiguous allocation policy. This sets the foundation for understanding how memory is organized and accessed.
Chapters
0:00 – 2:00 00:00-02:00
The instructor stands before a slide titled "Duty of Operating System," which lists specific activities in connection with memory management. He focuses heavily on the first point, "Address translation from Logical address to Physical address," physically circling these terms on the screen and writing "LA" and "PA" to denote the abbreviations. He explains that the OS is responsible for this translation, as well as managing the movement of processes and tracking memory usage to ensure efficient allocation and deallocation of space. He gestures to emphasize the importance of these tasks in the overall functioning of the system, ensuring students understand the core responsibilities.
2:00 – 3:48 02:00-03:48
The presentation shifts to a new slide stating that the first duty is translating logical addresses into physical addresses. The instructor introduces two specific approaches for storing a process in main memory: "Contiguous allocation policy" and "Non-contiguous allocation policy." He places checkmarks next to these options and draws a diagram with "PM" and "SM" connected by an arrow to visually represent the relationship between process memory and system memory. He explains how these policies facilitate the storage and management of processes, highlighting the distinction between how memory is allocated in different scenarios and why both are necessary for effective system operation.
The lecture progresses from a general overview of OS memory management duties to specific implementation strategies. It establishes that address translation is the primary duty and categorizes memory storage into contiguous and non-contiguous policies. This progression helps students understand the theoretical framework before diving into the technical details of how these allocation policies work in practice, providing a clear roadmap for the subsequent topics in the course.