What causes the VM subsystem to handle a page fault? the MMU translates a virtua

Question

What causes the VM subsystem to handle a page fault? the MMU translates a virtual address and determines the page number is beyond the page table length registers value the process attempts to execute this code: int p = 0 p = 100 the process attempts to perform an operation read/write/execute on a logical ad dress that is not permitted by the permission tits in the page table the MMU translates a virtual address and when it reads the page entry from the page tables finds the valid/invalid bit to be invalid and thus triggers a page fault exception Which of the following statements are advantages offered by virtual memory? frees programmers from worrying about physical memory fork0 can be improved by having the child process initially share the memory of its parent allows system libraries to be shared among many processes sparse virtual address space for processes

Explanation / Answer

7.) The MMU translates a virtual address and when it reads the page entry from the page tables finds the valid/invalid bit to be invalid and thus triggers a page fault exception.

The reason behind this is as follows:

"A page fault is only raised by the computer hardware when a running program is accessing the memory page which is basically not currently mapped by the memory management unit i.e. MMU into the virtual address space of the process."

8.)

These are all the advantages of the virtual memory. All are true as given above some of the major reasons behind this is that allocating memory is very easy and cheap in virtual memory. The data can be scattered all over the Processes.

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