In operating systems, memory management is the function responsible for managing the computer's primary memory.
The memory management function keeps track of the status of each memory location, either allocated or free. It determines how memory is allocated among competing processes, deciding which gets memory, when they receive it, and how much they are allowed. When memory is allocated it determines which memory locations will be assigned. It tracks when memory is freed or unallocated and updates the status.
This is distinct from application memory management, which is how a process manages the memory assigned to it by the operating system.
Single allocation is the simplest memory management technique. All the computer's memory, usually with the exception of a small portion reserved for the operating system, is available to a single application. MS-DOS is an example of a system that allocates memory in this way. An embedded system running a single application might also use this technique.
A system using single contiguous allocation may still multitask by swapping the contents of memory to switch among users. Early versions of the MUSIC operating system used this technique.
Partitioned allocation divides primary memory into multiple memory partitions, usually contiguous areas of memory. Each partition might contain all the information for a specific job or task. Memory management consists of allocating a partition to a job when it starts and unallocating it when the job ends.
Partitioned allocation usually requires some hardware support to prevent the jobs from interfering with one another or with the operating system. The IBM System/360 used a lock-and-key technique. Other systems used base and bounds registers which contained the limits of the partition and flagged invalid accesses. The UNIVAC 1108 Storage Limits Register had separate base/bound sets for instructions and data. The system took advantage of memory interleaving to place what were called the i bank and d bank in separate memory modules.
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Memory segmentation is an operating system memory management technique of dividing a computer's primary memory into segments or sections. In a computer system using segmentation, a reference to a memory location includes a value that identifies a segment and an offset (memory location) within that segment. Segments or sections are also used in s of compiled programs when they are linked together into a and when the image is loaded into memory.
In operating systems, memory management is the function responsible for managing the computer's primary memory. The memory management function keeps track of the status of each memory location, either allocated or free. It determines how memory is allocated among competing processes, deciding which gets memory, when they receive it, and how much they are allowed. When memory is allocated it determines which memory locations will be assigned. It tracks when memory is freed or unallocated and updates the status.
A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware unit that examines all memory references on the memory bus, translating these requests, known as virtual memory addresses, into physical addresses in main memory. In modern systems, programs generally have addresses that access the theoretical maximum memory of the computer architecture, 32 or 64 bits. The MMU maps the addresses from each program into separate areas in physical memory, which is generally much smaller than the theoretical maximum.
L'objectif de ce cours à projet est de donner aux étudiants une expérience de la pratique de la programmation système : écriture, correction, amélioration et analyse critique de leur code.
Cours de programmation en langage C se focalisant sur l'utilisation des ressources système, en particulier la gestion de la mémoire (pointeurs).
Explores memory virtualization, addressing address spaces, page tables, caching, and system design constants to optimize memory performance and reliability.
Explores virtual memory applications, including isolation benefits and memory-mapped files.
Explores memory organization, virtualization, dynamic memory allocation, stack, heap, and memory virtualization techniques like base register and segmentation.