# Memory Vmstat To monitor memory usage in the system, use a monitoring tool that provides reports about CPU activity in the system. ## **Memory Pages In / Out** Displays the number of memory pages loaded from secondary storage to physical memory within a specified time period.

## **Memory Pages Swap In / Out** Displays data transfer activities between physical memory and swap space on the Linux operating system.

## **Memory Page Faults** It is a process in which the operating system tries to access memory pages that do not currently exist in physical memory and must be obtained from secondary storage, such as disk.

## **OOM Killer** A mechanism in Linux systems that is responsible for terminating processes when physical memory and swap space run out.

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