LOCK_PROFILING in -stable

[Kris Kennaway]

Alfred Perlstein wrote:
> Hey guys, I have LOCK_PROFILING done for a product based on FreeBSD-6,
> this means I can relatively easily backport LOCK_PROFILING from
> FreeBSD-7 to FreeBSD-6.
> 
> Do we want this?
> 
> I'd like to do it if people want it.

I think it should be done, performance is a lot better than the old 6.x 
version and it also adds another very useful performance metric (time 
spent waiting for the lock).  The only concern is that it doesn't break 
ABI support when not compiled in, but I'm pretty sure you've already 
told me this is OK.

Thanks for looking at this.

Kris