> For the complete documentation index, see [llms.txt](https://docs.cloudeka.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cloudeka.ai/deka-flexi/deka-agent/detail-deka-agent/memory-vmstat.md).

# 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.

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### **Memory Pages Swap In / Out**

Displays data transfer activities between physical memory and swap space on the Linux operating system.

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### **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.

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### **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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