linux-kernel - Re: RT scheduling and a way to make a process hang, unkillable

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Message-ID: <20090223114541.GD31277@linux.vnet.ibm.com>
Date:	Mon, 23 Feb 2009 17:15:41 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Corey Hickey <bugfood-ml@...ooh.org>, linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, mtk.manpages@...il.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: RT scheduling and a way to make a process hang, unkillable

On Tue, Feb 17, 2009 at 12:15:39PM +0100, Peter Zijlstra wrote:
> On Tue, 2009-02-17 at 15:45 +0530, Dhaval Giani wrote:
> 
> > sched: Don't allow setuid to succeed if the user does not have rt bandwidth
> > 
> > Corey Hickey reported that on using setuid to change the uid of a
> > rt process, the process would be unkillable and not be running.
> > This is because there was no rt runtime for that user group. Add
> > in a check to see if a user can attach an rt task to its task group.
> 
> This looks good to me.
> 
> Does anybody object to the -ENOSPC return value? Should we introduce
> -ENOTIME for that?
> 
> Michael, Alan?
> 

Hi,

Any comments on which return value to return? Should we introduce
-ENOTIME?

Corey mentioned he found ENOSPC confusing.

Thanks,
-- 
regards,
Dhaval
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