Zz Java对象头部的一些信息和Biased锁
void lock(Object obj, Thread currentTr){ if( obj biased to currentTr) return; if( obj biased to other thread) pause owner thread at safe point change mark word and lock record to pretend that obj is locked by other thread with general lock. else{ //fall to common lock }}void unlock(Object obj, Thread currentTr){ if( obj biased to currentTr) return . else fall to common lock}?? 这个ppt讲得很通俗：Lock Reservation: Java Locks Can Mostly Do Without Atomic Operations

详细版本的论文可以看这里：www.research.ibm.com/trl/projects/jit/paper/p020-kawachiya.ps优化Biased锁在下面的文章中有详细介绍：Eliminating Synchronization-Related Atomic Operations with Biased Locking and Bulk Rebiasing