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After the recent discussions about the limitations on real time tasks and 
normal users...

Wli coined the term "isochronous" (greek for same time) for a real time task 
that was limited in it's timeslice but still guaranteed to run. I've decided 
to abuse this term and use it to name this new policy in this patch. This is 
neither real time, nor guaranteed.

What this patch does is introduce a new scheduler policy, SCHED_ISO. SI tasks 
get the maximum interactive bonus so they always get a dynamic priority of 5 
better than their static priority, but are penalised by having a smaller 
timeslice. Most interactive tasks don't use up their full timeslice anyway.

Since most users and applications are not going to be altering scheduler 
policies, this patch uses the current semantics in patches up to the O4int 
patch I have posted previously (and in 2.5.75-mm1) to dynamically allocate 
tasks as SI. This happens when their sleep avg hits MAX_SLEEP_AVG which is 
extremely unlikely to happen for the wrong task. Unfortunately it also means 
it takes at least 10 seconds. There are semantics in place to stop it 
happening to idle tasks, tasks forking, and new children.

Anyway it's pretty rough around the edges since I slapped it together more to 
prove it works, but appears to work as planned. The O*int patches appear to 
be hitting a ceiling to their ability and this can help them further but I 
need some feedback about it's usefulness, and appropriateness. 

Without further feedback about the O*int patches I can't do much to develop 
them further.

akpm: obviously this one is not to be included in -mm 

Enough talk. The patch is attached below and available at:
http://kernel.kolivas.org/2.5
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