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8a2b1b1477
The trace point was using the relfileno / fork / block for the to-be-read-in buffer. Some upcoming work would make that more expensive to provide. We still have buffer-flush-start/done, which can serve most tracing needs that buffer-write-dirty could serve. Discussion: https://postgr.es/m/f5164e7a-eef6-8972-75a3-8ac622ed0c6e@iki.fi