Unix Interview Questions and Answers
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If the disk block descriptor does not contain any record of the faulted page, then this causes the attempted memory reference is invalid and the kernel sends a ?Segmentation violation? signal to the offending process. This happens when the swapping system identifies any invalid memory reference.
On a swap device and not in memory,
On the free page list in the main memory,
In an executable file,
Marked ?demand zero?,
Marked ?demand fill?.
It sets the valid bit of the page by clearing the modify bit.
It recalculates the process priority.
At the Kernel Mode.
Protection fault refers to the process accessing the pages, which do not have the access permission. A process also incur the protection fault when it attempts to write a page whose copy on write bit was set during the fork() system call.
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