Re: [PATCH] O12.2int for interactivity

Con Kolivas
2003-08-15T16:38:56Z

On Fri, 15 Aug 2003 06:00, Timothy Miller wrote:
> If my guess from my previous email was correct (that is pri 5 gets
> shorter timeslide than pri 6), then that means that tasks of higher
> static priority have are penalized more than lower pri tasks for expiring.
>
> Say a task has to run for 15ms. If it's at a priority that gives it a
> 10ms timeslice, then it'll expire and get demoted. If it's at a
> priority that gives it a 20ms timeslice, then it'll not expire and
> therefore get promoted.
>
> Is that fair?

Yes, it's a simple cutoff at the end of the timeslice. If you use up the
timeslice allocated to you, then you have to pass a test to see if you can go
onto the active array or get expired. Since higher static priority (lower
nice) tasks get longer timeslices, they are less likely to expire unless they
are purely cpu bound and never sleep.

Con