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From: Nathan Lynch <ntl@pobox.com>
To: "Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-kernel@vger.kernel.org,
	containers@lists.linux-foundation.org,
	Oren Laadan <orenl@cs.columbia.edu>,
	Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: [PATCH 05/10] Core checkpoint/restart support code
Date: Mon, 04 Apr 2011 10:40:08 -0500	[thread overview]
Message-ID: <1301931608.31531.49.camel@tp-t61> (raw)
In-Reply-To: <20110404151017.GA4857@hallyn.com>

On Mon, 2011-04-04 at 10:10 -0500, Serge E. Hallyn wrote:
> Quoting Nathan Lynch (ntl@pobox.com):
> > On Sun, 2011-04-03 at 14:03 -0500, Serge E. Hallyn wrote:
> > > Quoting ntl@pobox.com (ntl@pobox.com):
> > > > Only a pid namespace init task - the child process produced by a call
> > > > to clone(2) with CLONE_NEWPID - is allowed to call these.  The state
> > > 
> > > So you make this useful for your cases by only using this with
> > > application containers - created using lxc-execute, or, more precisely,
> > > using lxc-init as the container's init.  So a container running a stock
> > > distro can't be checkpointed.
> > 
> > Correct, a conventional distro init won't work, and application
> > containers are my focus for now, at least.
> > 
> > 
> > > Is this just to keep the patch simple for now, or is there some reason
> > > to keep this limitation in place?
> > 
> > I guess you're asking whether non-pid-init processes could be allowed to
> > use the syscalls?
> 
> No.  I'm asking whether you are intending to later on change the checkpoint
> API to allow an external task to checkpoint a pid-init process, rather than
> the pid-init process having to initiate it itself.

No, that is not the intention.  I can see how that would be problematic
for those wanting to run minimally-modified distro containers, but I
think running a patched pid-init is a reasonable tradeoff to ask users
to make in order to get c/r.  And there's nothing to keep the standard
distro inits from growing c/r capability.



  reply	other threads:[~2011-04-04 15:40 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-28 23:40 [RFC 00/10] container-based checkpoint/restart prototype ntl
2011-02-28 23:40 ` [PATCH 01/10] Make exec_mmap extern ntl
2011-04-03 16:56   ` Serge E. Hallyn
2011-02-28 23:40 ` [PATCH 02/10] Introduce mm_has_pending_aio() helper ntl
2011-03-01 15:40   ` Jeff Moyer
2011-03-01 16:04     ` Nathan Lynch
2011-02-28 23:40 ` [PATCH 03/10] Introduce has_locks_with_owner() helper ntl
2011-04-03 18:55   ` Serge E. Hallyn
2011-02-28 23:40 ` [PATCH 04/10] Introduce vfs_fcntl() helper ntl
2011-04-03 18:57   ` Serge E. Hallyn
2011-02-28 23:40 ` [PATCH 05/10] Core checkpoint/restart support code ntl
2011-04-03 19:03   ` Serge E. Hallyn
2011-04-04 15:00     ` Nathan Lynch
2011-04-04 15:10       ` Serge E. Hallyn
2011-04-04 15:40         ` Nathan Lynch [this message]
2011-04-04 16:27           ` Serge E. Hallyn
2011-04-04 17:32             ` Oren Laadan
2011-04-04 21:43               ` Nathan Lynch
2011-04-04 22:03                 ` Serge E. Hallyn
2011-04-04 23:42                   ` Dan Smith
2011-04-05  2:17                     ` Serge E. Hallyn
2011-04-05 19:18                       ` Nathan Lynch
2011-04-04 22:29                 ` Matt Helsley
2011-04-04 17:41             ` Andrew Morton
2011-04-04 18:51               ` Serge E. Hallyn
2011-04-04 19:42                 ` Andrew Morton
2011-04-04 20:29                   ` Serge E. Hallyn
2011-04-04 21:55                   ` Matt Helsley
2011-04-04 23:15                     ` Andrew Morton
2011-04-04 23:16                     ` Valdis.Kletnieks
2011-04-04 23:43                       ` Matt Helsley
2011-04-04 22:11                   ` Serge E. Hallyn
2011-04-04 22:53                   ` Serge E. Hallyn
2011-04-04 21:20             ` Nathan Lynch
2011-04-04 21:53               ` Serge E. Hallyn
2011-02-28 23:40 ` [PATCH 06/10] Checkpoint/restart mm support ntl
2011-02-28 23:40 ` [PATCH 07/10] Checkpoint/restart vfs support ntl
2011-02-28 23:40 ` [PATCH 08/10] Add generic '->checkpoint' f_op to ext filesystems ntl
2011-02-28 23:40 ` [PATCH 09/10] Add generic '->checkpoint()' f_op to simple char devices ntl
2011-02-28 23:40 ` [PATCH 10/10] x86_32 support for checkpoint/restart ntl
2011-03-01  1:08 ` [RFC 00/10] container-based checkpoint/restart prototype Nathan Lynch

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