On 04/05/23 08:21, Peter Zijlstra wrote: > On Wed, May 03, 2023 at 09:22:24AM +0200, Juri Lelli wrote: > > Turns out percpu_cpuset_rwsem - commit 1243dc518c9d ("cgroup/cpuset: > > Convert cpuset_mutex to percpu_rwsem") - wasn't such a brilliant idea, > > as it has been reported to cause slowdowns in workloads that need to > > change cpuset configuration frequently and it is also not implementing > > priority inheritance (which causes troubles with realtime workloads). > > What were they doing ? Dynamically adjusting the DL parameters? > Yes, calling sched_setattr to adjust params and/or add/remove DL reservations.