Hello, On Thu, Feb 17, 2022 at 01:27:08PM +0100, Fabio M. De Francesco wrote: > Just to think and understand... what if the system-wide WQ were allocated as unbound > ordered (i.e., as in alloc_ordered_workqueue()) with "max_active" of one? > > 1) Would it solve the locks dependency problem? It'll actually make deadlocks a lot more prevalent. Some work items take more than one work to complete (e.g. flushing another work directly or waiting for something which must be completed by something else which may involve a system work item) and system wq's max active must be high enough that all those chains taking place at the same time should require fewer number of work items than max_active. > 2) Would it introduce performance penalties (bottlenecks)? I'd be surprised it wouldn't cause at least notcieable latency increases for some workloads. Thanks. -- tejun
