From: Nicholas Clark <nick@ccl4.org>
Date: Fri, 9 Nov 2007 17:57:45 +0000 (+0000)
Subject: Note that investigating PADTMP hash pessimisation is to be done.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=ac6197afadbb86961e32a48fadc53c2b2e69a878;p=p5sagit%2Fp5-mst-13.2.git

Note that investigating PADTMP hash pessimisation is to be done.

p4raw-id: //depot/perl@32254
---

diff --git a/pod/perltodo.pod b/pod/perltodo.pod
index e9cfa79..4b7ea0d 100644
--- a/pod/perltodo.pod
+++ b/pod/perltodo.pod
@@ -758,6 +758,12 @@ implement per-thread working directories: Win32 already does this.
 
 See also L</"Extend PerlIO and PerlIO::Scalar">.
 
+=head2 Investigate PADTMP hash pessimisation
+
+The peephole optimier converts constants used for hash key lookups to shared
+hash key scalars. Under ithreads, something is undoing this work. See
+See http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2007-09/msg00793.html
+
 =head1 Big projects
 
 Tasks that will get your name mentioned in the description of the "Highlights