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aio: Basic subsystem initialization

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This commit just does the minimal wiring up of the AIO subsystem, added in the
next commit, to the rest of the system. The next commit contains more details
about motivation and architecture.

This commit is kept separate to make it easier to review, separating the
changes across the tree, from the implementation of the new subsystem.

We discussed squashing this commit with the main commit before merging AIO,
but there has been a mild preference for keeping it separate.

Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
This commit is contained in:
Andres Freund
2025-03-17 18:51:33 -04:00
parent 65db3963ae
commit 02844012b3
24 changed files with 356 additions and 0 deletions
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51
doc/src/sgml/config.sgml
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@ -2638,6 +2638,57 @@ include_dir 'conf.d'
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-io-max-concurrency" xreflabel="io_max_concurrency">
<term><varname>io_max_concurrency</varname> (<type>integer</type>)
<indexterm>
<primary><varname>io_max_concurrency</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Controls the maximum number of I/O operations that one process can
execute simultaneously.
</para>
<para>
The default setting of <literal>-1</literal> selects a number based
on <xref linkend="guc-shared-buffers"/> and the maximum number of
processes (<xref linkend="guc-max-connections"/>, <xref
linkend="guc-autovacuum-worker-slots"/>, <xref
linkend="guc-max-worker-processes"/> and <xref
linkend="guc-max-wal-senders"/>), but not more than
<literal>64</literal>.
</para>
<para>
This parameter can only be set at server start.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-io-method" xreflabel="io_method">
<term><varname>io_method</varname> (<type>enum</type>)
<indexterm>
<primary><varname>io_method</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Selects the method for executing asynchronous I/O.
Possible values are:
<itemizedlist>
<listitem>
<para>
<literal>sync</literal> (execute asynchronous-eligible I/O synchronously)
</para>
</listitem>
</itemizedlist>
</para>
<para>
This parameter can only be set at server start.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>