From: Matt S Trout <mst@shadowcat.co.uk>
Date: Thu, 17 Jun 2010 01:47:58 +0000 (+0100)
Subject: doc hv_fill changes in f4431c .. fcd245
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=20566cce93e133c5c3bbd8cb5caa65828c6988b9;p=p5sagit%2Fp5-mst-13.2.git

doc hv_fill changes in f4431c .. fcd245
---

diff --git a/pod/perl5132delta.pod b/pod/perl5132delta.pod
index 88e0bde..a17689f 100644
--- a/pod/perl5132delta.pod
+++ b/pod/perl5132delta.pod
@@ -135,6 +135,13 @@ Skip unnecessary newAV() in ithread_create() (39f3f7).
 
 =back
 
+Eliminated xhv_fill from struct xpvhv: This saves 1 IV per hash and on some
+systems will cause struct xpvhv to become cache aligned. To avoid this
+memory saving causing a slowdown elsewhere, boolean use of HvFILL now
+calls HvTOTALKEYS instead (which is equivalent) - so while the fill data when
+actually required is now calculated on demand, the cases when this needs to
+be done should be few and far between (f4431c .. fcd245).
+
 =head1 Installation and Configuration Improvements
 
 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools