Direct Memory Access (DMA) is a technique to transfer the data from I/O to memory and from memory to I/O without the intervention of the CPU. For this purpose, a special chip, named DMA controller, is used to control all activities and synchronization of data. As result, compare to other data transfer techniques, DMA is much faster.
On the other hand, Virtual memory acts as a cache between main memory and secondary memory. Data is fetched in advance from the secondary memory (hard disk) into the main memory so that data is already available in the main memory when needed. It allows us to run more applications on the system than we have enough physical memory to support.
“What do you think a DMA controller can get direct access to the virtual memory or not?”
Justify your answer with solid reasons.
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