[LITMUS^RT] request for review: patches for arbitrary deadlines

[Jeremy Erickson]

A few comments:

1.) In base_task.c and base_mt_task.c, you replaced tabs with spaces while
defining PERIOD and EXEC_COST

2.) Why are you requiring that deadline not be more than period?  This
constraint is only necessary for HRT systems.  For SRT, you just ensure a
tardiness bound of at least $C_i - D_i$.  There are a couple of reasons you
could want to do this:
a.) A system designer may have a deadline that is larger than the
average-case execution time, but smaller than the WCET, if doing something
stochastic.
b.) If the deadlines aren't really deadlines but are just priority points.
 For example, without your restriction, G-FL can be implemented by
requesting $D_i - (m-1)/m C_i$ as the "deadline", but with your
restriction, a task can get rejected unnecessarily.  Technically this case
could actually apply to HRT systems as well.

Otherwise, looks good.

-Jeremy Erickson

On Tue, Jul 17, 2012 at 5:37 PM, Glenn Elliott <gelliott at cs.unc.edu> wrote:

> Thanks for the feedback, everyone.
>
> Please see the revised patches attached.
>
> -Glenn
>
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