During post_evacuate_collection_set do preserve_cm_referents to ensure no referents are lost. This is currently done unconditionally and when no concurrent cycle is going this will spin up a lot of tasks that will find that there is no work to be done.
The proposal is to avoid this unnecessary work by first checking that the cm-ref-processor has at least one discovered reference.
The proposal is to avoid this unnecessary work by first checking that the cm-ref-processor has at least one discovered reference.