Re: Context switch times

Davide Libenzi
2001-10-05T23:10:56Z

On Sat, 6 Oct 2001, Alan Cox wrote:

> > > 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 ?
>
> That would be the wrong key. You can argue certainly that it is maybe
> appropriate to use some function based on remaining scheduler ticks, but
> that already occurs as the scheduler ticks is the upper bound for priority
> band

No, i mean T = (Tstart - Tend) where :

Tstart = time the current ( prev ) task has been scheduled
Tend = current time ( in schedule() )

Basically it's the total time the current ( prev ) task has had the CPU

- Davide