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We delve into VM swappiness and virtual memory tunables in the RHEL kernel. We explore how to configure swappiness, explaining the range from 0 to 200, and its impact on swapping page cache versus anonymous pages. We also cover using tools like TooniD profiles for setting swappiness and managing memory tuning. Finally, we discuss drop caches, its usage, and best practices for maintaining system performance.

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Tuned Interactive self-paced lab:
https://www.redhat.com/en/interactive...

Excellent article on how to set swappiness with maths to determine pagecache or anon page memory preference (by Chris Down from Meta):
https://chrisdown.name/2018/01/02/in-...

Commands used: free, vmstat, ps, top, swapon, pmap

00:00 Introduction to VM Swappiness
00:26 Understanding Swappiness Values
01:41 Swappiness in Practice
03:58 Kernel Changes and Swappiness
04:42 Practical Tips for Swappiness Settings
06:02 Using Toon D for Swappiness
06:27 Persisting Swappiness Changes
06:51 Exploring Other Virtual Memory Tunables
07:00 Drop Caches Explained
09:05 Kernel Memory Management