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Groups > linux.kernel > #1182298
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support |
| Date | 2015-07-12 10:30 +0200 |
| Message-ID | <pLkO6-5ZO-9@gated-at.bofh.it> (permalink) |
| References | <pL9IZ-7CW-3@gated-at.bofh.it> <pL9J0-7CW-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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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
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