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    Memory Management, Paging and Virtual Memory Practice Questions for GATE CS

    Solve 0+ Memory Management, Paging and Virtual Memory practice questions for GATE CS with answers and detailed solutions. Free sample questions below.

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    Memory Management, Paging and Virtual Memory Practice Questions for GATE CS

    Solve 0+ Memory Management, Paging and Virtual Memory practice questions for GATE CS with answers and detailed solutions. Free sample questions below.

    Paging and Address Translation Scope

    Paging and Address Translation Scope
    Paging divides memory into fixed-size blocks called pages in virtual memory and frames in physical memory. For example, if a system has a 32 KB virtual space and a 4 KB page size, it creates exactly 8 pages. The symbol represents the virtual address space size, represents the page size, and the number of pages is .
    Explain this more simply

    Think of a book. The book is the virtual address space. Each page of the book is a fixed size. The bookshelf is physical memory, divided into slots of the exact same size. The page table is the index at the back of the book, telling you which slot holds which page.

    Go one level deeper

    The page size is always a power of two. This ensures the page offset can be extracted using a simple bitwise AND operation, avoiding expensive division hardware in the Memory Management Unit (MMU), which is the hardware component responsible for address translation.

    Virtual versus Physical Address Spaces

    A virtual address is generated by the CPU and represents a location in the process's logical address space. A physical address is the actual location in the main memory hardware. For instance, virtual page 3 might map to physical frame 7. The symbol denotes a virtual address, and denotes a physical address. The mapping is many-to-one in terms of potential locations, but one-to-one for active pages.
    Explain this more simply

    Imagine a hotel. The room numbers (virtual addresses) are sequential and make sense to the guest. The actual physical location of the room in the building (physical address) might be scattered across different wings. The front desk (page table) knows exactly which physical room corresponds to which room number.

    Go one level deeper

    The virtual address space can be larger than the physical address space. This is the foundation of virtual memory, allowing processes to be larger than available RAM by keeping inactive pages on secondary storage, though secondary storage mechanics are handled by page fault routines outside this specific scope.

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