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From: Oren Laadan <orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org>
To: Cedric Le Goater <clg-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Cc: Linux Containers
	<containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	"Eric W. Biederman"
	<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
	Linux Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
Subject: Re: [patch -mm 2/4] mqueue namespace : add unshare support
Date: Thu, 29 Nov 2007 15:14:14 -0500	[thread overview]
Message-ID: <474F1D96.3060606@cs.columbia.edu> (raw)
In-Reply-To: <474E944C.4020809-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>



Cedric Le Goater wrote:
>>> Index: 2.6.24-rc3-mm2/include/linux/sched.h
>>> ===================================================================
>>> --- 2.6.24-rc3-mm2.orig/include/linux/sched.h
>>> +++ 2.6.24-rc3-mm2/include/linux/sched.h
>>> @@ -27,6 +27,7 @@
>>>  #define CLONE_NEWUSER		0x10000000	/* New user namespace */
>>>  #define CLONE_NEWPID		0x20000000	/* New pid namespace */
>>>  #define CLONE_NEWNET		0x40000000	/* New network namespace */
>>> +#define CLONE_NEWMQ		0x80000000	/* New posix mqueue namespace */
>> That's it :) We've run out of clone flags on 32-bit platforms :(
> 
> yes. 
> 
> I have been giving some thoughts to a clone2() to extend the flags but
> andrew is preparing to recycle CLONE_DETACHED and CLONE_STOPPED for
> 2.6.26. Some we might have some more time in front of us.

Two comments:

1) Does it ever make any sense to clone the IPC namespace *without* doing
so also for the MQ namespace or vice versa ?  Unless there is a good
reason for doing so, a single CLONE_IPCMQ flag would suffice.

2) Before coming up with a new clone2() or other solution, what about the
proposed (and debated) sys_indrect() -- if it gets merged it can provide
the solution.

Oren.

> 
> C.
> _______________________________________________
> Containers mailing list
> Containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
> https://lists.linux-foundation.org/mailman/listinfo/containers

WARNING: multiple messages have this Message-ID (diff)
From: Oren Laadan <orenl@cs.columbia.edu>
To: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>,
	Linux Containers <containers@lists.osdl.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [patch -mm 2/4] mqueue namespace : add unshare support
Date: Thu, 29 Nov 2007 15:14:14 -0500	[thread overview]
Message-ID: <474F1D96.3060606@cs.columbia.edu> (raw)
In-Reply-To: <474E944C.4020809@fr.ibm.com>



Cedric Le Goater wrote:
>>> Index: 2.6.24-rc3-mm2/include/linux/sched.h
>>> ===================================================================
>>> --- 2.6.24-rc3-mm2.orig/include/linux/sched.h
>>> +++ 2.6.24-rc3-mm2/include/linux/sched.h
>>> @@ -27,6 +27,7 @@
>>>  #define CLONE_NEWUSER		0x10000000	/* New user namespace */
>>>  #define CLONE_NEWPID		0x20000000	/* New pid namespace */
>>>  #define CLONE_NEWNET		0x40000000	/* New network namespace */
>>> +#define CLONE_NEWMQ		0x80000000	/* New posix mqueue namespace */
>> That's it :) We've run out of clone flags on 32-bit platforms :(
> 
> yes. 
> 
> I have been giving some thoughts to a clone2() to extend the flags but
> andrew is preparing to recycle CLONE_DETACHED and CLONE_STOPPED for
> 2.6.26. Some we might have some more time in front of us.

Two comments:

1) Does it ever make any sense to clone the IPC namespace *without* doing
so also for the MQ namespace or vice versa ?  Unless there is a good
reason for doing so, a single CLONE_IPCMQ flag would suffice.

2) Before coming up with a new clone2() or other solution, what about the
proposed (and debated) sys_indrect() -- if it gets merged it can provide
the solution.

Oren.

> 
> C.
> _______________________________________________
> Containers mailing list
> Containers@lists.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/containers

  parent reply	other threads:[~2007-11-29 20:14 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20071128163728.177495768@fr.ibm.com>
2007-11-28 16:37 ` [patch -mm 1/4] mqueue namespace : add struct mq_namespace Cedric Le Goater
2007-11-28 16:37 ` [patch -mm 2/4] mqueue namespace : add unshare support Cedric Le Goater
2007-11-28 16:37 ` [patch -mm 3/4] mqueue namespace : enable the mqueue namespace Cedric Le Goater
2007-11-28 16:37 ` [patch -mm 4/4] mqueue namespace: adapt sysctl Cedric Le Goater
     [not found] ` <20071128163728.177495768-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
2007-11-28 17:28   ` [patch -mm 0/4] mqueue namespace Pavel Emelyanov
2007-11-28 17:28     ` Pavel Emelyanov
2007-11-29  9:52     ` Cedric Le Goater
     [not found] ` <20071128164349.196734045@fr.ibm.com>
2007-11-28 17:32   ` [patch -mm 2/4] mqueue namespace : add unshare support Pavel Emelyanov
2007-11-29 10:28     ` Cedric Le Goater
     [not found]     ` <474DA61B.5030301-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
2007-11-29 10:28       ` Cedric Le Goater
2007-11-29 10:28         ` Cedric Le Goater
2007-11-29 10:52         ` Andrew Morton
2007-11-29 13:57           ` Serge E. Hallyn
     [not found]         ` <474E944C.4020809-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
2007-11-29 20:14           ` Oren Laadan [this message]
2007-11-29 20:14             ` Oren Laadan
2007-11-29 21:49             ` Eric W. Biederman
2007-11-29 15:03   ` Eric W. Biederman
2008-06-20  3:00 ` [patch -mm 0/4] mqueue namespace Eric W. Biederman
2008-06-20  3:39   ` Eric W. Biederman
2008-06-20  3:39     ` Eric W. Biederman
2008-06-20 14:53     ` Serge E. Hallyn
2008-08-29  9:46     ` Cedric Le Goater
2008-06-20 14:50   ` Serge E. Hallyn
2008-06-20 19:11     ` Eric W. Biederman

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