linux-kernel - Re: [PATCH] sched: rt group scheduling, compare child's limit against parent's

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Message-Id: <1238171039.16890.308.camel@twins>
Date:	Fri, 27 Mar 2009 17:23:59 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Gautham Shenoy <ego@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: rt group scheduling, compare child's limit
 against parent's

On Fri, 2009-03-27 at 21:49 +0530, Dhaval Giani wrote:
> Hi Ingo, Peter,
> 
> I've not been able to follow the reasoning behind checking the sum of
> the children's runtime not exceeding the parent's runtime as opposed to
> the child's runtime not exceeding that of the parent.
> 
> From what I understand, the limits only guarantee that the group cannot
> exceed a certain limit and not guarantee a group gets to run. If my
> understanding is corrct, maybe the following patch is needed?

NAK, rt needs that as it guarantees a min too.

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