On Wed, Jan 06, 2021 at 04:41:04PM +0100, Vincent Guittot wrote: > Let me try again: > > Active balance is triggered for a number of voluntary cases like > misfit or pinned tasks cases but also after that a number of load > balance attempts failed to migrate a task. There is no need to use > active load balance when the group is overloaded because an overloaded > state means that there is at least one waiting task. Nevertheless, the > waiting task is not selected and detached until the threshold becomes > higher than its load. This threshold increases with the number of > failed lb (see the condition if ((load >> env->sd->nr_balance_failed) > > env->imbalance) in detach_tasks()) and the waiting task will end up > to be selected after a number of attempts.
Ah, makes sense now. Thanks!
