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From: John Baldwin <jhb@FreeBSD.org>
To: Julian Elischer <julian@elischer.org>
Date: Wed, 27 Oct 2004 16:31:16 -0400
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cc: Perforce Change Reviews <perforce@FreeBSD.org>
Subject: Re: PERFORCE change 63836 for review
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On Wednesday 27 October 2004 03:53 pm, Julian Elischer wrote:
> 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"

This would let the scheduler do that.  Right now we just change the priority 
via sched_prio(). This change would instead tell the scheduler at 
sched_sleep() what the boost is and it is free to store it and use it however 
it wants.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org