Under demand paging logical divisions of virtual memory, termed ___ are mapped t
ID: 3720844 • Letter: U
Question
Under demand paging logical divisions of virtual memory, termed ___ are mapped to, and loaded into ___ in physical RAM.
frames ... pages
blocks ... clusters
pages ... frames
blocks ... partitions
If an instruction or data item in virtual memory is referenced, what gets fetched into memory?
the specific instruction or data item
the entire page in which that instruction or data item is located
just enough data as comprises 1 word
a hard drive sector of data encompassing the instruction or data item referenced
How is a specific instruction or data item in a given page in virtual memory referenced?
by its file handle
by the page number and a page offset
by its block number
by its PCB
Reference to a page not already loaded in physical memory is referred to as a(n) ___ and results in a(n) ___
miss ... page fault
hit ... program crash
hit ... page offset
miss ... page swap
In a multitasking environment, an I/O request by a process that results in a page fault causes that process to go into a ___ state.
new
ready
running
blocked
terminated
An I/O request by a running process that results in a page fault causes the register values of that process to be ___.
pushed onto the stack or saved to the PCB
swapped out to the hard drive
destroyed
popped from the stack
If a page fault occurs but all frames are filled, the requested page will __
be pushed onto the stack or the process control block until a frame becomes available
be swapped out to the swap space of the hard drive
be terminated or masked so a higher priority process is not interrupted
overwrite an unwanted page in memory which has been copied to the swap space
frames ... pages
blocks ... clusters
pages ... frames
blocks ... partitions
If an instruction or data item in virtual memory is referenced, what gets fetched into memory?
the specific instruction or data item
the entire page in which that instruction or data item is located
just enough data as comprises 1 word
a hard drive sector of data encompassing the instruction or data item referenced
Explanation / Answer
1. Under demand paging logical divisions of virtual memory, termed pages are mapped to, and loaded into frames in physical RAM.
Reason - Pages refer to the virtual address space available in secondary memory while frames refer to the chunk of space available in physical memory, under demand paging a chunk of memory(pages) is copied from secondary memory into physical memory(frames) when the memory address required by the process is not present in the physical memory.
2. The specific instruction or data item in a given page in virtual memory is referenced by PCB(Process Control Block)
2a. Reference to a page not already loaded in physical memory is referred to as a miss and results in a pageswap
2b. In a multitasking environment, an I/O request by a process that results in a page fault causes that process to go into a terminated state.
2c. An I/O request by a running process that results in a page fault causes the register values of that process to be popped from the stack.
2d. If a page fault occurs but all frames are filled, the requested page will overwrite an unwanted page in memory which has been copied to the swap space.
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