Glossary term
What is page cache? Meaning for developers
Spare RAM the kernel uses to keep recently read file data, which it gives back when programs need memory.
Learn it properly · Linux & ShellLesson 7: Disks, Memory, Logs and Troubleshooting a Slow Serverdf, du, free, load average, iostat-style tools, reading logs, and a step-by-step method for a slow or full server.