On 08/05/18 16:23, Viresh Kumar wrote: > On 08-05-18, 12:36, Dietmar Eggemann wrote: > > That's true but where is the benefit by doing so? (Multiple) per-cluster or > > per-cpu frequency domains, why should the sugov kthread run on a foreign > > cpu? > > I am not sure I know the answer, but I have a question which you can > answer :) > > Is it possible for a CPU (which already has high priority deadline > activity going on) to be busy enough to be not able to run the > schedutil kthread for sometime ? That would be the only case I believe > where it would be better to let some other CPU go and change the > frequency for this one as we better run faster while we have the high > load going on.
Shouldn't happen. This kthreads are "special" and will preempt any other DL task (stop class win of course).