On 01/28/2014 01:19 PM, Waiman Long wrote:
This patch introduces a new queue spinlock implementation that can serve as an alternative to the default ticket spinlock. Compared with the ticket spinlock, this queue spinlock should be almost as fair as the ticket spinlock. It has about the same speed in single-thread and it can be much faster in high contention situations. Only in light to moderate contention where the average queue depth is around 1-2 will this queue spinlock be potentially a bit slower due to the higher slowpath overhead. This queue spinlock is especially suit to NUMA machines with a large number of cores as the chance of spinlock contention is much higher in those machines. The cost of contention is also higher because of slower inter-node memory traffic.
Signed-off-by: Waiman Long <Waiman.Long@xxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
