add new link on memory barrier

Author: cch123

memory_barrier.md

@@ -517,3 +517,5 @@ https://software.intel.com/en-us/articles/detect-and-avoid-memory-bottlenecks#_M
 https://stackoverflow.com/questions/29880015/lock-prefix-vs-mesi-protocol
 
 https://github.com/torvalds/linux/blob/master/Documentation/memory-barriers.txt
+
+http://www.overbyte.com.au/misc/Lesson3/CacheFun.html