Re: [PATCH] sched: Don't allow priority switch to realtime when thetask doesn't belong to init_task_group and when CONFIG_RT_GROUP_SCHED isn'tset

[Chris Friesen]

Peter Zijlstra wrote:
> On Mon, 2008-11-24 at 14:16 +0530, Dhaval Giani wrote:
>
>
> > Which would mean the init_task_group becase it contains those tasks which are
> > not grouped.
>
>
> Only because of implementation details (we implement the !group case by
> having them all part of a single group), conceptually they don't belong
> to any group, hence talking about moving it to some group is just wrong.

> Furthermore your statement shows another misconception, a group of
> ungrouped tasks doesn't make sense.

Arguably there is such a group, which is "the set of all RT tasks".

Whether or not they should map to the top-level cgroup is a different 
question.  Maybe in the !group case there should be a second top-level 
"rt" cgroup?  We could even make the RT sched tuning knobs available there.

Chris

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