Introduction - If you have any usage issues, please Google them yourself
In the process of address mapping, if page is found in the page, it is not in memory, resulting in page break. When there is a page break, if there is no free page in the operating system memory, the operating system must select a page in memory to remove it from the memory in order to give out space for the page to be transferred. The rule to choose which page to eliminate is called page replacement algorithm.