On Thu, Jul 28, 2022 at 10:59:01AM -0400, Waiman Long <longman@xxxxxxxxxx> wrote: > Cgroup v1 doesn't have this problem. v1 analogy would be: echo 2-3 >$dst/cpuset.cpus # job runs in $dst # one task T in $dst sets affinity just to one cpu # I rethink my config, I want to allow $dst more space echo 2-5 >$dst/cpuset.cpus Most tasks in $dst happily utilize the new cpus but it breaks affinity for T -- this must have been broken since ever. (Or I'd argue that per-thread affinities are just recommendations, if I have a task for nohz CPU, I should enforce its placement with cpuset from the beginning.) Michal
