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relnotes/13.0: add note about jail(8) cpuset behavior

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Attaching processes will now largely retain their cpu masks, which is a
fairly large and notable change from previous releases.

Reviewed by:	me_igalic.co
Approved by:	gjb (implicit)
Differential Revision:	https://reviews.freebsd.org/D29081
This commit is contained in:
Kyle Evans 2021-03-05 08:01:30 -06:00
parent 5a58483deb
commit fdef22474f
1 changed files with 4 additions and 0 deletions

4
website/content/en/releases/13.0R/relnotes.adoc
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@ -157,6 +157,10 @@ This section covers changes to kernel configurations, system tuning, and system
[[kernel-general]]
=== General Kernel Changes
Processes that attach to a {{< manpage "jail" "8" >}} will now completely rebase their {{< manpage "cpuset" "1" >}} onto the jail's cpuset.
Notably, if a process had been assigned a numbered cpuset then it will be assigned a new numbered set that is the combination of CPUs
allowed to the attaching process and the jail.
Processes belonging to the superuser will implicitly widen their CPU mask as needed if they share no CPUs in common with the jail.
[[drivers]]
== Devices and Drivers