d6792cc58e
Since 999dec9ec6, pg_stat_io can show read time with zero reads
for an IO Context: a foreign IO is counted as a read only in the
initiating backend, while other waiters record only the wait time. That
violates pgstat_bktype_io_stats_valid(). Relax the check to allow time
without a matching operation count, since we want to count read wait
time even in backends that did not initiate the read. This also enables
future accounting of waits on IO resources (e.g., AIO handles) in
backends that didn't start the IO.
Author: Andrey Rachitskiy <pl0h0yp1@gmail.com>
Reported-by: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Discussion: https://postgr.es/m/ak5lccE4qiQpOBHn@pryzbyj2023
Backpatch-through: 19
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.