On 07/12/2015 04:21 AM, Peter Zijlstra wrote:
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.
-ENONUMBERS
Will send out an updated patchset with patch-to-patch performance numbers.
Cheers,
Longman
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