The values of the valid/invalid bit for a page reference that resulted in a page fault are invalid and valid.
Each item in the page table has a valid-invalid bit attached; "valid" denotes that the associated page is in the process' logical address space and is, thus, a lawful page. The page is not in the process' logical address space when the status is "invalid".
When a computer application tries to access a memory block that isn't currently loaded into the system's RAM, a page fault occurs. This exception instructs the operating system to send the block from a device's storage (SSD or HD) to RAM by locating it in virtual memory.
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