1 files changed, 79 insertions, 8 deletions

diff --git a/doc/src/sgml/system-views.sgml b/doc/src/sgml/system-views.sgml
index b58c52ea50f..d3ff8c35738 100644
--- a/doc/src/sgml/system-views.sgml
+++ b/doc/src/sgml/system-views.sgml
@@ -82,6 +82,11 @@
      </row>
 
      <row>
+      <entry><link linkend="view-pg-dsm-registry-allocations"><structname>pg_dsm_registry_allocations</structname></link></entry>
+      <entry>shared memory allocations tracked in the DSM registry</entry>
+     </row>
+
+     <row>
       <entry><link linkend="view-pg-file-settings"><structname>pg_file_settings</structname></link></entry>
       <entry>summary of configuration file contents</entry>
      </row>
@@ -1086,6 +1091,75 @@ AND c1.path[c2.level] = c2.path[c2.level];
 
  </sect1>
 
+ <sect1 id="view-pg-dsm-registry-allocations">
+  <title><structname>pg_dsm_registry_allocations</structname></title>
+
+  <indexterm zone="view-pg-dsm-registry-allocations">
+   <primary>pg_dsm_registry_allocations</primary>
+  </indexterm>
+
+  <para>
+   The <structname>pg_dsm_registry_allocations</structname> view shows shared
+   memory allocations tracked in the dynamic shared memory (DSM) registry.
+   This includes memory allocated by extensions using the mechanisms detailed
+   in <xref linkend="xfunc-shared-addin-after-startup" />.
+  </para>
+
+  <table>
+   <title><structname>pg_dsm_registry_allocations</structname> Columns</title>
+   <tgroup cols="1">
+    <thead>
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       Column Type
+      </para>
+      <para>
+       Description
+      </para></entry>
+     </row>
+    </thead>
+
+    <tbody>
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>name</structfield> <type>text</type>
+      </para>
+      <para>
+       The name of the allocation in the DSM registry.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>type</structfield> <type>text</type>
+      </para>
+      <para>
+       The type of allocation.  Possible values are <literal>segment</literal>,
+       <literal>area</literal>, and <literal>hash</literal>, which correspond
+       to dynamic shared memory segments, areas, and hash tables, respectively.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>size</structfield> <type>int8</type>
+      </para>
+      <para>
+       Size of the allocation in bytes.  NULL for entries of type
+       <literal>area</literal> and <literal>hash</literal>.
+      </para></entry>
+     </row>
+    </tbody>
+   </tgroup>
+  </table>
+
+  <para>
+   By default, the <structname>pg_dsm_registry_allocations</structname> view
+   can be read only by superusers or roles with privileges of the
+   <literal>pg_read_all_stats</literal> role.
+  </para>
+ </sect1>
+
  <sect1 id="view-pg-file-settings">
   <title><structname>pg_file_settings</structname></title>
 
@@ -2819,21 +2893,18 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
          <para>
           <literal>unreserved</literal> means that the slot no longer
           retains the required WAL files and some of them are to be removed at
-          the next checkpoint.  This state can return
+          the next checkpoint.  This typically occurs when
+          <xref linkend="guc-max-slot-wal-keep-size"/> is set to
+          a non-negative value.  This state can return
           to <literal>reserved</literal> or <literal>extended</literal>.
          </para>
         </listitem>
         <listitem>
          <para>
-          <literal>lost</literal> means that some required WAL files have
-          been removed and this slot is no longer usable.
+          <literal>lost</literal> means that this slot is no longer usable.
          </para>
         </listitem>
        </itemizedlist>
-       The last two states are seen only when
-       <xref linkend="guc-max-slot-wal-keep-size"/> is
-       non-negative. If <structfield>restart_lsn</structfield> is NULL, this
-       field is null.
       </para></entry>
      </row>
 
@@ -3932,7 +4003,7 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
        <structfield>passwd</structfield> <type>text</type>
       </para>
       <para>
-       Password (possibly encrypted); null if none.  See
+       Encrypted password; null if none.  See
        <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>
        for details of how encrypted passwords are stored.
       </para></entry>