An introduction to control groups (cgroups) version 2
summary
Explains how cgroups v2 is the unified pseudo‑filesystem interface and shows concrete commands: create a cgroup by making a directory, add processes with echo PID > cgroup.procs, and enforce limits (example: set pids.max = 5 and background forks fail once five PIDs exist). Demonstrates cpu controls with both weight and strict bandwidth (e.g. cpu.max=20000 100000 → 20% CPU), enabling controllers via cgroup.controllers and cgroup.subtree_control, and device/network policies via eBPF.
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