Exam (elaborations)

WGU 191 Chapter 7 and 8 on Virtual and Main Memory Exam Review Questions and A Level Marking Scheme Latest 2024/2025

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Course
WGU C191

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WGU C191

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Uploaded on October 15, 2024
Number of pages 8
Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

interrupt driven correct answer when the cpu doe
coalescing correct answer if needed split blocks
slab allocation of kernel memory correct answer
cache allocation of kernel memory correct answ

Institution WGU C191
Course WGU C191

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WGU 191 Chapter 7 and 8 on Virtual and
Main Memory Exam Review Questions
and A Level Marking Scheme Latest
2024/2025

Interrupt driven - correct answer When the CPU does not poll the control bit, but rather
gets an interrupt signal

Buddy-system/power-of-2-allocator - correct answer Allocates memory from a fixed-
size segment consisting of physically contiguous pages via units sized as a power of
2(or rounded up to the next as needed).

Buddy - correct answer When a larger memory block is divided into a smaller part to
satisfy the request. Two smaller parts of a block are of equal size and called buddies.
Note that this may cause fragmentation (i.e. if a 11kb block is needed but 16kb block is
allocated(b/c it's a power of 2))

Coalescing - correct answer If needed split blocks of memory (buddies) can come
together to form larger segments of memory if needed

Slab allocation of kernel memory - correct answer A slab is one or more physically
contiguous pages

Cache allocation of kernel memory - correct answer Consists of one or more slabs.
There is a single cache for each unique kernel data structure

Objects - correct answer Objects populate the cache(multiple slabs) of the kernel data
structure that the cache represents (e.g. semaphore cache has semaphore objects)

Prepaging - correct answer Bringing into memory at one time all pages that will be
needed

, Resolution - correct answer Isolating the memory that is actually needed through a
smaller page size

TLB Reach - correct answer The amount of memory accessible from the translation
lookaside buffer. Found by the number of entries multiplied by the page size

page locking/pinning - correct answer ensures a process stays in main memory and is
exempt from paging.

Clustering - correct answer Handling a page fault by bringing in not only the faulting
page, but also several pages following the faulting page.

Working set minimum - correct answer The minimum number of pages the process is
guaranteed to have in memory up to its working set maximum

Automatic working set trimming - correct answer When free memory falls below a
threshold, the virtual memory will use this to restore the memory above the threshold

Pageout - correct answer when pages are written to disk

Priority paging - correct answer Distinguishing pages that have been allocated to
processes versus pages that have been allocated to regular files

True or False? A program does not need to be stored in memory in its entirety. - correct
answer True

True or False? A physical address space is at least as large as a virtual address space.
- correct answer False

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Exam (elaborations) ·

Exam (elaborations)

WGU 191 Chapter 7 and 8 on Virtual and Main Memory Exam Review Questions and A Level Marking Scheme Latest 2024/2025

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