oldalszámtömb

The term "oldalszámtömb" is a Hungarian word that translates to "page number block" or "page number array" in English. It is a concept primarily used in the context of computer memory management, particularly in operating systems that employ paging as a memory allocation strategy.

In a paged memory system, the physical memory is divided into fixed-size blocks called frames, and the logical address space of a process is divided into blocks of the same size called pages. The operating system maintains a page table for each process, which maps virtual page numbers to physical frame numbers. The "oldalszámtömb" refers to the data structure that holds this mapping information. It essentially acts as a lookup table, allowing the CPU to translate a virtual address generated by a program into a physical address in RAM.

Each entry in the "oldalszámtömb" typically contains the physical frame number corresponding to a virtual page. Additional bits might be included to store control information such as the present bit (indicating whether the page is currently in memory), the dirty bit (indicating if the page has been modified), and protection bits (controlling read, write, and execute permissions). When a program accesses memory, the Memory Management Unit (MMU) consults the "oldalszámtömb" to locate the physical address of the required page. If a page is not present in memory (indicated by the present bit), a page fault occurs, triggering the operating system to load the page from secondary storage into an available frame.