Briefly explains following a) What is the purpose of paging the page tables? b) How does the use of virtual memory improve system utilization? c) Under what circumstances do page faults occur? d) Describe the actions taken by the operating system when a page fault occurs. e) What is the purpose of a translation lookaside buffer? f) What is demand paging? g) What is pure demand paging?

Briefly explains following a) What is the purpose of paging the page tables? b) How does the use of virtual memory improve system utilization? c) Under what circumstances do page faults occur? d) Describe the actions taken by the operating system when a page fault occurs. e) What is the purpose of a translation lookaside buffer? f) What is demand paging? g) What is pure demand paging?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 21VE

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Paging: Select all of the following statements that are true. Systems that use paging but do not support inverted page tables maintain at least one separate page table for each process. The frame table is a system-wide data structure. When paging is applied, the selected page size determines which part of a virtual address belongs to the page number and which to the offset. The page size may differ from the frame size. The Translation Look-aside Buffer (TLB) represents a page directory for all pages in the system. Paging is prone to internal fragmentation.
What is the working set page replacement algorithm? How does the working set algorithm work? Explain locality of reference with respect to memory references and how this applies to the working set page replacement algorithm.
Assume we have a page table when some pages aren’t in main memory. Is there any occurrence of page faults ? If not, please explain why. And if so, what exactly do you mean by “page fault” and how do you handle them? Explain with a diagram
In the S/370 architecture, a storage key is a control field associated with each page- sized frame of real memory. Two bits of that key that are relevant for page replace- ment are the reference bit and the change bit. The reference bit is set to 1 when any address within the frame is accessed for read or write, and is set to 0 when a new page is loaded into the frame. The change bit is set to 1 when a write operation is per- formed on any location within the frame. Suggest an approach for determining which page frames are least-recently-used, making use of only the reference bit.
What does "memory leak" entail in terms of dynamic memory allocation?
How does garbage collection work in memory management, and what are the challenges associated with implementing garbage collection in programming languages?
A clear and concise description of dynamic memory allocation is presented here for your perusal.
What is dynamic memory allocation, and how does it function?Is it feasible to classify and explain the many dynamic memory allocators?
The principal advantage is a savings in physical memory space. This occurs for two reasons: (1) a user page table can be paged in to memory only when it is needed. (2) The operating system can allocate user page tables dynamically, creating one only when the process is created. Of course, there is a disadvantage: address translation requires extra work.
How does dynamic memory allocation define "memory leaks?"
For the layman, we define and clarify dynamic memory allocation.
A. What is dynamic memory allocation, why is it needed, and how it is realized? B. If there is more than one type of dynamic memory allocation/allocators, identify and describe each.