What is it in computer operating systems?
Most computers have two forms of memory, virtual memory and physical memory. Virtual memory, as the name suggests, is only a construct that allows the program to operate as if all the information needed to start was stored in the same place. Each information stored in virtual memory corresponds to the physical memory address. The page table is the data structure used by the computer operating system to monitor the connection between virtual memory and physical memory. The virtual memory correlation process with physical memory is called mapping. When a computer user creates a list of songs in the media player program, he can take songs from several different files on the computer. Physical files are not moved, but the program knows where to approach every song.
The list of songs is like virtual memory. It is a neighboring block of information to easily access the program. Individual files with individual songs in them are like physical memory. They are stored in many different places throughout the computer. FYzic memory is stored in the page table.
Piece of hardware on your computer receives virtual memory requirements and then approaches the page table and finds the location of physical memory. This hardware is called either a memory management unit (MMU) or a translation unit of a dynamic address (data). In order to achieve access to data as quickly as possible, the MMU deposits the final number of frequently used maps in a table called Translation Lookaside Beller. The translation buffer, which acts as a tab of favorite items in a web browser, allows the computer to skip quickly to a frequently used memory location.
If the address is not the one that the computer often applies to, the MMU will directly access the page table. Hides the table until it finds the address in question. It then returns the address to the lookside translation reconstrument from which the program is access to information.
y Computer cannot find the address in the page table. This may happen if there is no map between virtual memory and physical memory. In this case, the operating system sends a message to a program that tells her to turn off. Look at the look, it may also fail if a physical file has been moved, for example, if it has been laid on a backup disk and removed from the system.