linux-kernel - 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

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Message-ID: <492C491B.8060103@nortel.com>
Date:	Tue, 25 Nov 2008 12:51:07 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	bharata@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>
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

Peter Zijlstra wrote:
> On Mon, 2008-11-24 at 09:24 -0600, Chris Friesen wrote:
> 
>>Peter Zijlstra wrote:

>>>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".
> 
> 
> Sure, I understand that, and in fact that's how its implemented, no
> group is still one group (which is how you can bootstrap math from
> group/set theory).
> 
> But its not a manageable group in the cgroup sense, its just the
> collection of RT tasks.

True, but it would be valuable to have statistics for how much cpu time 
the RT tasks are consuming.

Chris
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