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Commitsca326e903and1f8c504e3widened the byte-count arguments of smgr__md__read__done and smgr__md__write__done to "long long int". SystemTap's dtrace(1) fails on that specific spelling and falls back with a warning (misreported near the previous probe). Use ssize_t and size_t instead, matching the md.c call sites. Revise probes.d's note about which types are usable as probe arguments: recommend using system-supplied type names (macOS dtrace rejects names like PostgreSQL's uint64), and call out "long long int" as a known SystemTap failure case rather than a wider failure mode. Also, update the monitoring.sgml entries for these probes, which were missed by the prior commits. Reported-by: Laurenz Albe <laurenz.albe@cybertec.at> Author: Andrey Rachitskiy <pl0h0yp1@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/697d3c88568442cd637d8453d129f1bb14bbd2a8.camel@cybertec.at