lkml.org 
[lkml]   [2001]   [Oct]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Context switch times
On Fri, 5 Oct 2001, Alan Cox wrote:

> > Let me see if I have this right. Task priority goes to max on any (?)
> > sleep regardless of how long. And to min if it doesn't sleep for some
> > period of time. Where does the time slice counter come into this, if at
> > all?
> >
> > For what its worth I am currently updating the MontaVista scheduler so,
> > I am open to ideas.
>
> The time slice counter is the limit on the amount of time you can execute,
> the priority determines who runs first.
>
> So if you used your cpu quota you will get run reluctantly. If you slept
> you will get run early and as you use time slice count you will drop
> priority bands, but without pre-emption until you cross a band and there
> is another task with higher priority.
>
> This damps down task thrashing a bit, and for the cpu hogs it gets the
> desired behaviour - which is that the all run their full quantum in the
> background one after another instead of thrashing back and forth

What if we give to prev a priority boost P=F(T) where T is the time
prev is ran before the current schedule ?



- Davide


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:04    [W:0.178 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site