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hi im chris hanish and this is cs361 systems programming today were going to be talking about the nitty-gritty of how virtual memory gives you the capabilities it does when it comes to mapping physical addresses onto virtual addresses and how we handle page hits and page misses lets get started so last time we were talking about why talking about why do we need virtual memory why is it a hard problem what are whats the design space that we can be choosing from different strategies to accomplish our goal from but today were going to be talking about how are we actually going to solve that problem and what are the nitty-gritty you know specific problems that were going to need to solve to actually create a good working virtual memory the first of these problems is the addressing problem where because were going to be using physical addresses and virtual addresses we dont really know where our address 400 000 or any given address is actually going to be stored at run time our use