linux-kernel - Re: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart

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Message-Id: <20090212114207.e1c2de82.akpm@linux-foundation.org>
Date:	Thu, 12 Feb 2009 11:42:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	dave@...ux.vnet.ibm.com, mingo@...e.hu, orenl@...columbia.edu,
	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
	hpa@...or.com, tglx@...utronix.de
Subject: Re: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart

On Thu, 12 Feb 2009 13:30:35 -0600
Matt Mackall <mpm@...enic.com> wrote:

> On Thu, 2009-02-12 at 10:11 -0800, Dave Hansen wrote:
> 
> > > - In bullet-point form, what features are missing, and should be added?
> > 
> >  * support for more architectures than i386
> >  * file descriptors:
> >   * sockets (network, AF_UNIX, etc...)
> >   * devices files
> >   * shmfs, hugetlbfs
> >   * epoll
> >   * unlinked files
> 
> >  * Filesystem state
> >   * contents of files
> >   * mount tree for individual processes
> >  * flock
> >  * threads and sessions
> >  * CPU and NUMA affinity
> >  * sys_remap_file_pages()
> 
> I think the real questions is: where are the dragons hiding? Some of
> these are known to be hard. And some of them are critical checkpointing
> typical applications. If you have plans or theories for implementing all
> of the above, then great. But this list doesn't really give any sense of
> whether we should be scared of what lurks behind those doors.

How close has OpenVZ come to implementing all of this?  I think the
implementatation is fairly complete?

If so, perhaps that can be used as a guide.  Will the planned feature
have a similar design?  If not, how will it differ?  To what extent can
we use that implementation as a tool for understanding what this new
implementation will look like?

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