Ingo Molnar wrote:
> There's no time or spin-rate based heuristics in this at all (i.e. these 
> mutexes are not 'adaptive' at all!),

FYI: The original "adaptive" name was chosen in the -rt implementation
to reflect that the locks can adaptively spin or sleep, depending on
conditions.  I realize this is in contrast to the typical usage of the
term when it is in reference to the spin-time being based on some
empirical heuristics, etc as you mentioned.  Sorry for the confusion.

Regards,
-Greg