Index: linux-2.6.21-rc5/mm/slub.c
===================================================================
--- linux-2.6.21-rc5.orig/mm/slub.c	2007-03-29 13:46:12.000000000 -0700
+++ linux-2.6.21-rc5/mm/slub.c	2007-03-29 13:46:35.000000000 -0700
@@ -78,6 +78,25 @@
  */
 
 /*
+ * Issues still to be resolved:
+ *
+ * - Strange failures where the process context is corrupted on i386.
+ *
+ * - The per cpu array is updated for each new slab and and is a remote
+ *   cacheline for most nodes. This could become a bouncing cacheline given
+ *   enough frequent updates. There are 16 pointers in a cacheline.so at
+ *   max 16 cpus could compete. Likely okay.
+ *
+ * - Support PAGE_ALLOC_DEBUG. Should be easy to do.
+ *
+ * - Support DEBUG_SLAB_LEAK. Trouble is we do not know where the full
+ *   slabs are in SLUB.
+ *
+ * - SLAB_DEBUG_INITIAL is not supported but I have never seen a use of
+ *   it.
+ */
+
+/*
  * Flags from the regular SLAB that SLUB does not support:
  */
 #define SLUB_UNIMPLEMENTED (SLAB_DEBUG_INITIAL)