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

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Message-ID: <49A44A86.2030409@nortel.com>
Date:	Tue, 24 Feb 2009 13:29:10 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Andi Kleen <andi@...stfloor.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	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

Peter Zijlstra wrote:
> On Tue, 2009-02-24 at 16:58 +0100, Andi Kleen wrote:
>> Dhaval Giani <dhaval@...ux.vnet.ibm.com> writes:
>>>  		new->euid = euid;
>>> Index: linux-2.6/include/asm-generic/errno.h
>>> ===================================================================
>>> --- linux-2.6.orig/include/asm-generic/errno.h
>>> +++ linux-2.6/include/asm-generic/errno.h
>>> @@ -106,4 +106,6 @@
>>>  #define	EOWNERDEAD	130	/* Owner died */
>>>  #define	ENOTRECOVERABLE	131	/* State not recoverable */
>>>  
>>> +#define ENOTIME		132	/* No time available to run process */
>> It's normally not a good idea to add new errnos, because old glibc's
>> strerror()s won't know about it.
>>
>> There are also so many around that you surely will find an existing
>> one which sounds appropiate.
> 
> Feel free to suggest one, I've read over all these error thingies
> several times and non really stood out.
> 
> We tried ENOSPC, but people thought that weird too.

What about EDQUOT, as in "the user you're trying to become has no quota".

Chris
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