On Mar 2, 2007, at 9:10 AM, Andrew Doran wrote:

> Log Message:
> pmap_reference, pmap_destroy: update the pmap reference count using
> _lock_cas. This is ugly and needs to be redone when atomic ops are
> available, but for now it knocks about 5% contention off the kernel
> lock in one test that I have done.

I am working on an atomic ops API.  I'll propose it on tech-kern  
within a few days.

-- thorpej