kern: add KPI to derive a root from arbitrary cpuset
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Authored by kevans on Dec 6 2025, 4:13 AM.

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olce
markj

Summary

Rewrite cpuset_create_root() in terms of the new KPI with the parent
cpuset set to the prison's cpuset. We'll use this in a subsequent
change to allow an admin to create different cpuset topologies for their
jails.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 69095
Build 65978: arc lint + arc unit

Event Timeline

kevans created this revision.Dec 6 2025, 4:13 AM

Herald added a subscriber: imp. · View Herald TranscriptDec 6 2025, 4:13 AM

kevans requested review of this revision.Dec 6 2025, 4:13 AM

Harbormaster completed remote builds in B69095: Diff 167632.Dec 6 2025, 4:13 AM

kevans added a parent revision: D54097: kern: don't require pp/tdp for all values of `which`.Dec 6 2025, 4:13 AM

kevans added a child revision: D54099: kern: jail: allow specifying a cpuset.parent at creation time.

kevans added a subscriber: jamie.Aug 25 2026, 6:38 PM

kevans added inline comments.

sys/kern/kern_cpuset.c
1737	I think I did this to avoid breaking KBI of `cpuset_create_root`, but it's pretty unllkely to be used in any kind of modules. @jamie suggested just changing `cpuset_create_root` to take a `cpuset` instead, which seems fine (and I plan to do).