Add missing last padding / Comment

common/src/main/java/io/netty/util/internal/MpscLinkedQueue.java

@@ -69,6 +69,9 @@ final class MpscLinkedQueue<E> extends MpscLinkedQueueTailRef<E> implements Queu
 
     private static final long serialVersionUID = -1878402552271506449L;
 
+    long p00, p01, p02, p03, p04, p05, p06, p07;
+    long p30, p31, p32, p33, p34, p35, p36, p37;
+
     // offer() occurs at the tail of the linked list.
     // poll() occurs at the head of the linked list.
     //

common/src/main/java/io/netty/util/internal/MpscLinkedQueueTailRef.java

@@ -48,6 +48,7 @@ abstract class MpscLinkedQueueTailRef<E> extends MpscLinkedQueuePad1<E> {
 
     @SuppressWarnings("unchecked")
     protected final MpscLinkedQueueNode<E> getAndSetTailRef(MpscLinkedQueueNode<E> tailRef) {
+        // LOCK XCHG in JDK8, a CAS loop in JDK 7/6
         return (MpscLinkedQueueNode<E>) UPDATER.getAndSet(this, tailRef);
     }
 }