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Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support

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  Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support Peter Zijlstra <peterz@infradead.org> - 2015-07-12 10:30 +0200

#1182298 — Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support

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
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