On Sat, Jul 11, 2015 at 04:36:56PM -0400, Waiman Long wrote: > Like the native qspinlock, using the pending bit when it is lightly > loaded to acquire the lock is faster than going through the PV queuing > process which is even slower than the native queuing process. It also > avoids loading two additional cachelines (the MCS and PV nodes). > > This patch adds the pending bit support for PV qspinlock. The > pending bit code has a smaller spin threshold. It will default back > to the queuing method if it cannot acquired the lock within a certain > time limit.
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