Dynamic Partitioning and Multiple-Partition Allocation Quiz

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Which register holds the smallest legal physical memory address?

Memory register
Base register (correct)
Limit register
Address register

What does the limit register specify?

Logical address
Physical address
Memory space
Size of the range (correct)

What is the maximum physical address in the given figure?

420140
1024000 (correct)
120100
300040

What is a process's view of its own memory called?

Logical (virtual) address space (A) Signup and view all the answers

Which register can be loaded only by the operating system?

Base and limit registers (C) Signup and view all the answers

What does the CPU check for every memory access generated in user mode?

If it is between base and limit for that user (B) Signup and view all the answers

Which of the following is a main memory hardware organization technique discussed in the text?

Cache (C) Signup and view all the answers

What is the purpose of the base and limit registers mentioned in the text?

To determine the range of legal addresses that a process may access (D) Signup and view all the answers

Which of the following is true about main memory access?

Main memory is accessed via a transaction on the memory bus (C) Signup and view all the answers

What is the purpose of memory protection mentioned in the text?

To protect user processes from one another (A) Signup and view all the answers

What is the purpose of cache in memory management?

To improve memory access speed (A) Signup and view all the answers

What is an address space in memory management?

The memory space used and accessed by a process during its execution (C) Signup and view all the answers

Which memory allocation technique limits the degree of multiprogramming by the number of partitions and allocates variable partition sizes based on a process' needs?

Dynamic partitioning (D) Signup and view all the answers

Which fragmentation occurs when the memory blocks cannot be allocated to processes due to their small size, resulting in inefficient use of memory?

External fragmentation (A) Signup and view all the answers

Which solution involves shifting processes so that they are contiguous, consolidating free memory into one block?

Compaction (D) Signup and view all the answers

What is the purpose of virtual memory?

To manage the movement of pages and segments (C) Signup and view all the answers

What memory-management scheme divides physical memory into fixed-sized blocks called frames and divides the address space into blocks of the same size called pages?

Paging (D) Signup and view all the answers

What must hardware support and the operating system include for virtual memory to be practical and effective?

Movement of pages and segments (B) Signup and view all the answers

Which of the following is true about the page table in a paging system?

All of the above. (D) Signup and view all the answers

What is the purpose of the page number in the address translation scheme?

It is used as an index into the page table. (B) Signup and view all the answers

In a paging system, what is the purpose of the page offset?

It is combined with the base address to access the memory unit. (C) Signup and view all the answers

In a paging system with a logical address space of 2m and a page size of 2n, what is the formula to calculate the number of pages?

2^(m+n) (B) Signup and view all the answers

What is the formula to calculate the page number and page offset given a logical address and page size?

Page number = Logical Address/Page Size, Offset = Address - (Page number * Page Size) (A) Signup and view all the answers

What is the disadvantage of using straightforward methods for memory structures in paging?

The memory structures can become too large. (D) Signup and view all the answers

Which of the following is an advantage of segmented paging?

Segment table has only one entry corresponding to one actual segment. (A) Signup and view all the answers

What is a characteristic of hashed page tables?

Each element in the hash table has a linked list of elements hashing to the same location. (A) Signup and view all the answers

What are the fields present in each element of a hashed page table?

Virtual Page Number, Value of the Mapped Page Frame, Pointer to the Next Element (D) Signup and view all the answers

What is the purpose of using hashed page tables?

To avoid collisions in the page table. (C) Signup and view all the answers

What is the virtual page number in a hashed page table?

The bits that are not a part of the page offset. (A) Signup and view all the answers

What is the limitation of page table size in segmented paging?

It is limited by the size of the segment table. (A) Signup and view all the answers