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What is page fault and what are the steps taken by the OS to remove page fault?
A page fault is caused while a page that hasn't been brought into memory is being addressed. The paging hardware now origins a page fault trap. This trap is a result of the OS malfunction to bring the desired page into memory. The procedure to eliminate the fault is
1. A confirms is made to see whether the reference is valid.
2. If reference is unacceptable then process is terminated else the page is brought into memory.
3. A free frame is found as well as a disk schedule is prepared to read the desired page into frame.
4. When complete page table is updated along with the interrupted instruction is restarted.
how does DMA increase system concurrency
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