Subject: Re: [PATCH] sched: Don't allow priority switch to realtime when
 the task doesn't belong to init_task_group and when CONFIG_RT_GROUP_SCHED
 isn't set
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: bharata@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Ingo Molnar <mingo@elte.hu>
In-Reply-To: <20081124084644.GA26526@linux.vnet.ibm.com>
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	 <1227515526.7685.21861.camel@twins>
	 <20081124084644.GA26526@linux.vnet.ibm.com>
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Date: Mon, 24 Nov 2008 10:06:15 +0100
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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. Either we support grouping, in which
case any task belongs to a group, or we don't and they all belong to no
(or the same) group.

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