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sched-dl: doc typos fixed.
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fchecconi authored and jlelli committed Nov 20, 2012
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19 changes: 14 additions & 5 deletions Documentation/scheduler/sched-deadline.txt
Expand Up @@ -35,12 +35,12 @@ CONTENTS
2. Task scheduling
==================

The typical -deadline task will be made up of a computation phase (instance)
The typical -deadline task is composed of a computation phase (instance)
which is activated on a periodic or sporadic fashion. The expected (maximum)
duration of such computation is called the task's runtime; the time interval
by which each instance needs to be completed is called the task's relative
deadline. The task's absolute deadline is dynamically calculated as the
time instant a task (better, an instance) activates plus the relative
time instant a task (or, more properly) activates plus the relative
deadline.

The EDF[1] algorithm selects the task with the smallest absolute deadline as
Expand Down Expand Up @@ -147,9 +147,18 @@ someone must call sched_setscheduler2() on it, or it won't even start.
3. Future plans
===============

Still Missing:
Still missing:

- refinements to deadline inheritance, especially regarding the possibility
of retaining bandwidth isolation among non-interacting tasks. This is
being studied from both theoretical and practical point of views, and
hopefully we can have some demonstrative code soon.
being studied from both theoretical and practical points of view, and
hopefully we should be able to produce some demonstrative code soon.
- (c)group based bandwidth management, and maybe scheduling;
- access control for non-root users (and related security concerns to
address), which is the best way to allow unprivileged use of the mechanisms
and how to prevent non-root users "cheat" the system?

As already discussed, we are planning also to merge this work with the EDF
throttling patches [https://lkml.org/lkml/2010/2/23/239] but we still are in
the preliminary phases of the merge and we really seek feedback that would help us
decide on the direction it should take.

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