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Date: Fri, 27 Feb 2009 01:19:01 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
       Dave Hansen <dave@linux.vnet.ibm.com>, mpm@selenic.com,
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       torvalds@linux-foundation.org, tglx@linutronix.de, xemul@openvz.org
Subject: Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ
 do?
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On Fri, 27 Feb 2009 10:03:23 +0100 Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Alexey Dobriyan <adobriyan@gmail.com> wrote:
> 
> > > I think the main question is: will we ever find ourselves in 
> > > the future saying that "C/R sucks, nobody but a small 
> > > minority uses it, wish we had never merged it"? I think the 
> > > likelyhood of that is very low. I think the current OpenVZ 
> > > stuff already looks very useful, and i dont think we've 
> > > realized (let alone explored) all the possibilities yet.
> > 
> > This is collecting and start of dumping part of cleaned up 
> > OpenVZ C/R implementation, FYI.
> > 
> >  arch/x86/include/asm/unistd_32.h   |    2 
> >  arch/x86/kernel/syscall_table_32.S |    2 
> >  include/linux/Kbuild               |    1 
> >  include/linux/cr.h                 |   56 ++++++
> >  include/linux/ipc_namespace.h      |    3 
> >  include/linux/syscalls.h           |    5 
> >  init/Kconfig                       |    2 
> >  kernel/Makefile                    |    1 
> >  kernel/cr/Kconfig                  |   11 +
> >  kernel/cr/Makefile                 |    8 
> >  kernel/cr/cpt-cred.c               |  115 +++++++++++++
> >  kernel/cr/cpt-fs.c                 |  122 +++++++++++++
> >  kernel/cr/cpt-mm.c                 |  134 +++++++++++++++
> >  kernel/cr/cpt-ns.c                 |  324 +++++++++++++++++++++++++++++++++++++
> >  kernel/cr/cpt-signal.c             |  121 +++++++++++++
> >  kernel/cr/cpt-sys.c                |  228 ++++++++++++++++++++++++++
> >  kernel/cr/cr-ctx.c                 |  141 ++++++++++++++++
> >  kernel/cr/cr.h                     |   61 ++++++
> >  kernel/cr/rst-sys.c                |    9 +
> >  kernel/sys_ni.c                    |    3 
> >  20 files changed, 1349 insertions(+)
> 
> That does not look scary to me at all. Andrew?

I think we'd need to look into the details.  Sure, it's isolated from a
where-it-is-in-the-tree POV.  But I assume that each of those files has
intimate and intrusive knowledge of the internals of data structures?