PERFORCE change 63836 for review

[Julian Elischer]

John Baldwin wrote:

>   on needresched?  If so, it goes into sched_userret().
>+- Need lots of thought on realtime and idle time priorities and handling
>+  tsleep() priority "boosts" for such processes.  Might need to make
>+  the priority boost be something passsed to sched_sleep() rather than
>+  a sched_prio() call.
>


I'd like to see the boost kept separate and added during the calcualtions
that way  various algorythms could be used on the boost..
for example I'd like to see the boost exponentially reduced each 
clocktick encounterred in userspace
or maybe the boost could include a suggested lifetime..
e.g. "boost by 10% for 20mSec"