Use single-bit fields for global flags

[exim.git] / doc / doc-txt / ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 583603f19ac0e043e73d54a65ba0a78377f35d74..333ae731c95182d3fd0973566151007600ed3590 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -98,6 +98,12 @@ PP/03 Make ${utf8clean:} expansion operator detect incomplete final character.
 
 PP/04 Documentation: current string operators work on bytes, not codepoints.
 
+JH/21 Change as many as possible of the global flags into one-bit bitfields; these
+      should pack well giving a smaller memory footprint so better caching and
+      therefore performance.  Group the declarations where this can't be done so
+      that the byte-sized flag variables are not interspersed among pointer
+      variables, giving a better chance of good packing by the compiler.
+
 
 Exim version 4.91
 -----------------