Message-ID: <492C491B.8060103@nortel.com>
Date: Tue, 25 Nov 2008 12:51:07 -0600
From: "Chris Friesen" <cfriesen@nortel.com>
User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513)
MIME-Version: 1.0
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Dhaval Giani <dhaval@linux.vnet.ibm.com>, bharata@linux.vnet.ibm.com,
       linux-kernel@vger.kernel.org,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Ingo Molnar <mingo@elte.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
References: <20081120061854.GA4349@in.ibm.com>	 <1227402676.7685.19942.camel@twins> <20081124035807.GA3278@in.ibm.com>	 <1227515526.7685.21861.camel@twins>	 <20081124084644.GA26526@linux.vnet.ibm.com>	 <1227517575.7685.21906.camel@twins>  <492AC715.9080602@nortel.com> <1227540990.4259.296.camel@twins>
In-Reply-To: <1227540990.4259.296.camel@twins>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 906
Lines: 27

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/