From 3727b17c39a9dba97b08f15211e3631c82162fdf Mon Sep 17 00:00:00 2001
From: Evan Prodromou <evan@status.net>
Date: Fri, 9 Oct 2009 10:39:56 -0400
Subject: [PATCH] don't write session if it's unchanged

---
 classes/Session.php | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/classes/Session.php b/classes/Session.php
index d641edbbe4..79a69a96ea 100644
--- a/classes/Session.php
+++ b/classes/Session.php
@@ -85,9 +85,18 @@ class Session extends Memcached_DataObject
 
             return $session->insert();
         } else {
-            $session->session_data = $session_data;
+            if (strcmp($session->session_data, $session_data) == 0) {
+                self::logdeb("Not writing session '$id'; unchanged");
+                return true;
+            } else {
+                self::logdeb("Session '$id' data changed; updating");
 
-            return $session->update();
+                $orig = clone($session);
+
+                $session->session_data = $session_data;
+
+                return $session->update($orig);
+            }
         }
     }