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Ch8 虛擬記憶體
第 17 題／共 47 題
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17. Virtual Memory、Page Fault、Copy-on-Write、TLB
#OS-08-017
中
Virtual Memory
Page Fault
Copy-on-Write
TLB
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Which of the following statements on virtual memory management are true?
A
(a) After enabling virtual memory, CPUs operating in user mode can decide to access either physical or virtual addresses based on the compiler configurations.
B
(b) If a required data is not in physical memory, the user process raises a page fault and runs the page fault handler to transfer the data from storage to memory, possibly relying on DMA for efficiency.
C
(c) When a process forks a child by using Copy-on-Write (Cow), the process and its child share all memory pages until one of them writes to the page.
D
(d) When a logical address is generated by an x86 CPU, the MMU first checks if its page number is present in the TLB. If not, CPU walks the page table to get the physical address without the help from the operating system.
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