What is relocation in memory management in OS?

What is relocation in memory management in OS?

Relocation. Relocatability – the ability to move process around in memory without it affecting its execution. OS manages memory, not programmer, and processes may be moved around in memory. MM must convert program’s logical addresses into physical addresses.

Why do we need relocation in OS?

When a program gets swapped out to a disk memory, then it is not always possible that when it is swapped back into main memory then it occupies the previous memory location, since the location may still be occupied by another process. We may need to relocate the process to a different area of memory.

What is relocation in assembler?

A relocation is a directive embedded in the object file that enables source code to refer to a label whose target address is unknown or cannot be calculated at assembly time. The assembler emits a relocation in the object file, and the linker resolves this to the address where the target is placed.

What is dynamic relocation in OS?

Dynamic relocation is where data currently stored in the computer memory is relocated to other parts of the computer. This process creates more efficient memory storage while a program is still active.

What do you mean by relocation?

Definition of relocate transitive verb. : to locate again : establish or lay out in a new place. intransitive verb. : to move to a new location.

What is relocation concept?

Relocation is the process of connecting symbolic references with symbolic definitions. For example, when a program calls a function, the associated call instruction must transfer control to the proper destination address at execution.

What is the relocation factor?

Relocation involves ‘push factors’ and ‘pull factors’. Push factors are things that make a firm want to move from an existing location; these are normally negatives about that site. Pull factors attract a company to a new location and are positive reasons why the new location is preferable to the existing location.

What is a relocation table?

The relocation table contains information about instructions that need to be updated if the addresses in the file change, for example if the file is linked together with another.

What is relocatable code?

Relocatable code is software whose execution address can be changed. A relocatable program might run at address 0 in one instance, and at 10000 in another. Just to confuse the issue, partially built programs are composed of object modules unfortunately called “relocatables”.

What is relocatable loading in operating system?

Relocatable loading – Load program at different addresses based on what is available. Dynamic run-time loading – Load and reload the program at different addresses while the program is running.

What is a relocation record?

Relocation records : information about addresses referenced in this object file that the linker must adjust once it knows the final memory allocation. Additional information for debugging (e.g. map from line numbers in the source file to location in the code section).

What is a relocation register?

[‚rē·lō′kā·shən ‚rej·ə·stər] (computer science) A hardware element that holds a constant to be added to the address of each memory location in a computer program running in a multiprogramming system, as determined by the location of the area in memory assigned to the program.

What is the use of MMU?

An important function of the Memory Management Unit (MMU) is to enable the system to run multiple tasks, as independent programs running in their own private virtual memory space.

What is address space in OS?

What is an address space? z/OS concepts. The range of virtual addresses that the operating system assigns to a user or separately running program is called an address space. This is the area of contiguous virtual addresses available for executing instructions and storing data.

What is fragmentation in operating system?

Fragmentation is an unwanted problem in the operating system in which the processes are loaded and unloaded from memory, and free memory space is fragmented. Processes can’t be assigned to memory blocks due to their small size, and the memory blocks stay unused.

What is another word for relocation?

In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for relocation, like: move, , redevelopment, remotion, removal, resettlement and redeployment.

What is relocate job?

Relocation in a professional sense is when an employer asks you to move in order to be closer to their office. Relocations are common for highly skilled professionals who attract the attention of employers from different cities. You may also experience having to move for your current employer.