UNIX Programming and Technical

Q. What is page fault? Its types?

A. Page fault refers to the situation of not having a page in the main memory when any process references it. There are two types of page fault :Validity fault, Protection fault.

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UNIX Other Question

Q. What are the phases of swapping a page from the memory?

A. Page stealer finds the page eligible for swapping and places the page number in the list of pages to be swapped.
Kernel copies the page to a swap device when necessary and clears the valid bit in the page table entry, decrements the pfdata reference count, and places the pfdata table entry at the end of the free list if its reference count is 0. Q. In what way the Fault Handlers and the Interrupt handlers are different?

A. Fault handlers are also an interrupt handler with an exception that the interrupt handlers cannot sleep. Fault handlers sleep in the context of the process that caused the memory fault. The fault refers to the running process and no arbitrary processes are put to sleep.