On Mon, Nov 09 2020, t...@kernel.org wrote: > Given that nothing on > these types of workqueues can be latency sensitive
This caught my eye and it seems worth drilling in to. There is no mention of "latency" in workqueue.rst or workqueue.h. But you seem to be saying there is an undocumented assumption that latency-sensitive work items much not be scheduled on CM-workqueues. Is that correct? NFS writes are latency sensitive to a degree as increased latency per request will hurt overall throughput. Does this mean that handling write-completion in a CM-wq is a poor choice? Would it be better to us WQ_HIGHPRI?? Is there any rule-of-thumb that can be used to determine when WQ_HIGHPRI is appropriate? Thanks, NeilBrown
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