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Ch2 I/O 運作方式
第 7 題／共 23 題
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7. I/O System、SSD、Interrupt、Swap
#OS-02-007
中
I/O System
SSD
Interrupt
Swap
📝
☆
Which of the following statements on I/O system are true?
A
(a) NAND-flash based SSDs suffer from limited lifetime. The SSD controller runs a software layer to alleviate this issue by leveling writes without the help of the operating system.
B
(b) When the CPU detects that a controller has asserted a signal on the interrupt-request line, the CPU performs a state save and jumps to the interrupt-handler routine at a fixed address in memory.
C
(c) When DRAM generates an interrupt, CPU saves the state of the user code, switches to kernel mode, and dispatches to the kernel routine or thread that implements the requested service.
D
(d) In Linux, the swap space is now used only for anonymous memory. That is, Linux will not swap out storage-backed files.
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