doc: PG 16 relnotes, add memory overhead reduction item

Reported-by: David Rowley
Discussion: https://postgr.es/m/CAApHDvqnUoyrJxS4uqnKo87b3_cUjaDDte4NQag49YHu1oEOgA@mail.gmail.com

diff --git a/doc/src/sgml/release-16.sgml b/doc/src/sgml/release-16.sgml
index 77a9feace9eb4bd38d524af8ba8c0acd7db3659e..be97c290d92c3869bac82b51600f41700788e8f9 100644 (file)
--- a/doc/src/sgml/release-16.sgml
+++ b/doc/src/sgml/release-16.sgml
@@ -2798,6 +2798,17 @@ Author: Peter Eisentraut <peter@eisentraut.org>
 <para>
 Adjust pg_attribute columns for efficiency (Peter Eisentraut)
 </para>
+</listitem>
+
+<!--
+Author: David Rowley <drowley@postgresql.org>
+2022-08-29 [c6e0fe1f2] Improve performance of and reduce overheads of memory ma
+-->
+
+<listitem>
+<para>
+Reduce overhead of memory allocations (Andres Freund, David Rowley)
+</para>
 </listitem>
 
     </itemizedlist>