Ingo Molnar wrote:

>    The new PI code covers all synchronization objects in Linux (on
>    PREEMPT_REALTIME): spinlocks, rwlocks, semaphores and rwsems. 
>    Feedback on the design of this code would be welcome, and patches as
>    well, if you have a better scheme. The code is pretty modular so feel 
>    free to experiment with alternative schemes.

I didn't see closure being performed of a possible blocked-owner
dependency chain, but only promotion of the immediate owner.  It
is possible for a mutex owner to itself be blocked on another mutex
requiring promotion of the latter mutex owner(s).

-- 
john.cooper@timesys.com
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