Let's demystify memory
summary
Explains how Linux maps per-process virtual address spaces onto physical RAM via the MMU translates virtual to physical and page tables, how page cache prevents repeated disk reads, and how swap moves little-used pages to disk. Shows observable numbers (about 319 MB cache and ~180 MB free in a demo), demonstrates cgroup limits by setting cgroup memory.max = 10MB and then spawning processes until the OOM killer and a fork‑bomb behavior appear, so viewers see cause, tool, and effect.
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chapters (14)
- 0:00Introduction to memory
- 1:50What is RAM
- 3:17Pointers and segmentation
- 5:46Virtual memory basics
- 8:19Memory management unit
- 10:11Memory allocation in processes
- 12:23Memory pages and segments
- 13:25Swap space explained
- 15:34Page cache and performance
- 16:57Out of memory killer
- 17:59Fork bomb demonstration
- 19:25Live system memory issues
- 21:34Process isolation and limits
- 23:22Cgroups and memory limits
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