Memory Management in real time operating system
- 2. Process stack management in a real-time operating system is responsible for efficiently allocating, initializing, and maintaining memory stacks for individual tasks or processes. It ensures that tasks can execute predictably, meet real-time deadlines, and operate reliably within the constraints of the system's memory resources
- 3. Advantages: Ensure that task execution is predictable and meets deadlines Provide strong isolation between tasks Efficient Memory Usage Disadvantages: Stack overflows can lead to catastrophic failures Managing multiple task stacks in an RTOS can be complex Potentially limiting the number of tasks the RTOS can handle efficiently
- 4. Memory management in an RTOS is responsible for allocating, managing, and protecting memory resources to ensure the predictable and reliable behavior of real-time tasks and the overall system
- 5. Contiguous memory management schemes Non-Contiguous memory management schemes
- 7. In a Contiguous memory management scheme, each program occupies a single contiguous block of storage locations, i.e., a set of memory locations with consecutive addresses.
- 8. In a Non-Contiguous memory management scheme, the program is divided into different blocks and loaded at different portions of the memory that need not necessarily be adjacent to one another. This scheme can be classified depending upon the size of blocks and whether the blocks reside in the main memory or not.
- 9. Paging is a technique that eliminates the requirements of contiguous allocation of main memory. In this, the main memory is divided into fixed-size blocks of physical memory called frames. The size of a frame should be kept the same as that of a page to maximize the main memory and avoid external fragmentation
- 10. Segmentation is a technique that eliminates the requirements of contiguous allocation of main memory. In this, the main memory is divided into variable- size blocks of physical memory called segments. It is based on the way the programmer follows to structure their programs. With segmented memory allocation, each job is divided into several segments of different sizes, one for each module. Functions, subroutines, stack, array, etc., are examples of such modules.