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.l...@hp.com>
Acked-by: Rik van Riel <r...@redhat.com>
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