On Mon, 2014-02-03 at 20:25 +0100, Peter Zijlstra wrote:
> +void m_spin_unlock(struct m_spinlock **lock)
> +{
> + struct m_spinlock *node = this_cpu_ptr(&m_node);
> + struct m_spinlock *next;
> +
> + if (likely(cmpxchg(lock, node, NULL) == node))
> + return;
At this current point, (node->next != NULL) is a likely scenario.
Perhaps we can also add the following code here:
next = xchg(&node->next, NULL);
if (next) {
ACCESS_ONCE(next->locked) = 1;
return;
}
> + next = m_spin_wait_next(lock, node, NULL);
> + if (next)
> + ACCESS_ONCE(next->locked) = 1;
> +}
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