/proc/lock_stat 输出的锁状态的时间单位是什么?微秒还是纳秒?
class name con-bounces contentions waittime-min waittime-max waittime-total acq-bounces acquisitions holdtime-min holdtime-max holdtime-total
-----------------------------------------------------------------------------
&(&dentry->d_lock)->rlock: 2917691 3323806 0.10 157427.70 2221545741.66 8786458 19485395 0.00 235.65 38647798.25