A memory protection key (MPK) mechanism divides physical memory into blocks of a particular size (e.g., 4 KiB), each of which has an associated numerical value called a protection key. Each process also has a protection key value associated with it.
How in the primary memory one process is protected from another process?
In this type of allocation, relocation-register scheme is used to protect user processes from each other, and from changing operating-system code and data. Relocation register contains value of smallest physical address whereas limit register contains range of logical addresses.
What are various ways for memory and address protection?
Some methods to prevent it is:
- Fence: We confine users to inside of the memory and system memory to another side. …
- Relocation. Programs are written as if starting from location 0 in the memory. …
- Base/bounds register. …
- Segmentation. …
- Paging. …
- Paging +segmentation combined.
How can memory protection be enforced when sharing is allowed?
How can memory protection be enforced when sharing is allowed? Code sharing (e.g. of utilities or libraries) or read-only data sharing is transparent to the processes concerned. It allows the system to economise on the use of physical memory by avoiding multiple copies.
Why paging is used in OS?
Paging is a memory management technique in which the memory is divided into fixed size pages. Paging is used for faster access to data. When a program needs a page, it is available in the main memory as the OS copies a certain number of pages from your storage device to main memory.
Which two methods are used to protect the reliability of memory?
A, C. Parity memory and ECC have an additional memory chip added for parity. They are both methods used to protect the reliability of memory.
Which registers are used to protect the main memory?
Pointers to memory segments on x86 processors can also be stored in the processor’s segment registers. Initially x86 processors had 4 segment registers, CS (code segment), SS (stack segment), DS (data segment) and ES (extra segment); later another two segment registers were added – FS and GS.
What are the two steps of a process execution?
The two steps of a process execution are : (choose two)
- ✅ I/O Burst, CPU Burst.
- CPU Burst.
- Memory Burst.
- OS Burst.
What is memory address protection?
Memory protection includes protection for the memory that the OS itself uses as well as the memory of user processes. Major challenge in multi-programming system is to prevent one program from affecting the data and programs in the memory space of other users.
What is the basic need in protecting memory in multi user environment?
Discussion Forum
| Que. | What is basic need in protecting memory in multi-user environment ? |
|---|---|
| b. | We need a variable register |
| c. | A fence register has to be used known as base register. |
| d. | None of the mentioned |
| Answer:A fence register has to be used known as base register. |
Which register is used for memory protection Mcq?
Explanation: The fence register is used for memory protection on the computer. It is a way to access the memory in the computer.