linux-kernel - Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ do?

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Message-ID: <20090227105706.GC2939@x200.localdomain>
Date:	Fri, 27 Feb 2009 13:57:06 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Dave Hansen <dave@...ux.vnet.ibm.com>,
	mpm@...enic.com, containers@...ts.linux-foundation.org,
	hpa@...or.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	viro@...iv.linux.org.uk, linux-api@...r.kernel.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de, xemul@...nvz.org
Subject: Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ
	do?

On Fri, Feb 27, 2009 at 01:19:01AM -0800, Andrew Morton wrote:
> On Fri, 27 Feb 2009 10:03:23 +0100 Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 
> > * Alexey Dobriyan <adobriyan@...il.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?

Yes, and this is by design.
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