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Can a page be, at the same time, in physical memory and in virtual memory?
If I ask for an address that’s on virtual memory, will it always trigger a page fault? If the first question is true, then it should only trigger a page fault if the page is not also in physical memory. Is that right?
When you page out a memory block you need the space for other stuff, so it would make no sense to have it in RAM and in page file.
Yes thats right. Pagefaults cause an interrupt. If you always had a pagefault when you access memory than you had only very little performace.