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aio: Add io_method=io_uring

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Performing AIO using io_uring can be considerably faster than
io_method=worker, particularly when lots of small IOs are issued, as
a) the context-switch overhead for worker based AIO becomes more significant
b) the number of IO workers can become limiting

io_uring, however, is linux specific and requires an additional compile-time
dependency (liburing).

This implementation is fairly simple and there are substantial optimization
opportunities.

The description of the existing AIO_IO_COMPLETION wait event is updated to
make the difference between it and the new AIO_IO_URING_EXECUTION clearer.

Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Jakub Wartak <jakub.wartak@enterprisedb.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de
Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
This commit is contained in:
Andres Freund
2025-03-18 14:40:05 -04:00
parent 8eadd5c73c
commit c325a7633f
14 changed files with 589 additions and 2 deletions
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8
doc/src/sgml/config.sgml
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@ -2710,6 +2710,14 @@ include_dir 'conf.d'
<literal>worker</literal> (execute asynchronous I/O using worker processes)
</para>
</listitem>
<listitem>
<para>
<literal>io_uring</literal> (execute asynchronous I/O using
io_uring, requires a build with
<link linkend="configure-option-with-liburing"><option>--with-liburing</option></link> /
<link linkend="configure-with-liburing-meson"><option>-Dliburing</option></link>)
</para>
</listitem>
<listitem>
<para>
<literal>sync</literal> (execute asynchronous-eligible I/O synchronously)