Here is an In-depth manual from 8 days ago at https://documentation.suse.com/sle-rt/12-SP5/single-html/SLE-RT-shielding/, upstream https://github.com/lpechacek/cpuset with issues.

Please note, that cset-shield is written in Python and GPLv2 and is a few thousand LOC.

The manual also describes some not nice quirks

Note. There is a minor chance that a task forks during move and its child remains in the root cpuset.

I think the author did not want to deal with strace and/or pid 1/process group tracking, which is another level of complexity and inefficient in Python.

Afaiu, there are 4 things needed

1. setup of shield configuration (creation of shield and moving tasks into it)
1. running process with options
1. teardown of shield configuration / reset of system state (moving tasks out and delete shield)
1. Detection, if there is a current cpu shield running (including info how to clean it up manually)

I think a partial reimplementation in Zig should start with the quirk (process movement handling forks). I think I'll make a writeup of the underlying problem soon.

look into CPU shielding #39

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