linux-kernel - Re: [RFC] CPU hard limits

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Date:	Fri, 5 Jun 2009 03:02:46 -0700
From:	Paul Menage <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	bharata@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Herbert Poetzl <herbert@...hfloor.at>
Subject: Re: [RFC] CPU hard limits

On Fri, Jun 5, 2009 at 2:55 AM, Balbir Singh<balbir@...ux.vnet.ibm.com> wrote:
>
> What about applications running as root, that can create their own
> groups? How about multiple instances of the same application started?
> Do applications need to know that creating a group will hurt
> guarantees provided to others?

Yes, of course. If you're handing out guarantees, but other users
can/will create cgroups with whatever parameters they like and won't
respect the guarantees that you've made, then those guarantees are
worthless. How do hard limits help in that situation?

Paul
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