Os Memory Management Questions
The second chance page replacement algorithm is a memory management technique used in operating systems. It is a modification of the FIFO (First-In-First-Out) algorithm. In this algorithm, each page in memory is given a second chance before being replaced. When a page needs to be replaced, the algorithm checks if its reference bit is set. If the reference bit is set, indicating that the page has been accessed recently, the algorithm clears the reference bit and moves the page to the end of the queue. If the reference bit is not set, the page is replaced. This algorithm ensures that pages that have been recently accessed are given a second chance to remain in memory, reducing the likelihood of unnecessary page replacements.