cgroups
You want to track some pids. You say "I'll use cgroups for this".
Now you have 4 problems:
1. cgroups v1
2. cgroups v2
3. cgroups hybrid
4. systemd
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cgroups,pazi
For pazi benchmarks, I want to track forked children. 2 days later and now my benchmarks run as root and depend on systemd. Good stuff. https://github.com/euank/pazi/pull/59
