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

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Message-ID: <20090226155755.GA1456@x200.localdomain>
Date:	Thu, 26 Feb 2009 18:57:55 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, 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, mingo@...e.hu,
	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 Thu, Feb 12, 2009 at 03:04:05PM -0800, Dave Hansen wrote:
> dave@...itz:~/kernels/linux-2.6-openvz$ git diff v2.6.27.10... kernel/cpt/ | diffstat 
>  Makefile        |   53 +
>  cpt_conntrack.c |  365 ++++++++++++
>  cpt_context.c   |  257 ++++++++
>  cpt_context.h   |  215 +++++++
>  cpt_dump.c      | 1250 ++++++++++++++++++++++++++++++++++++++++++
>  cpt_dump.h      |   16 
>  cpt_epoll.c     |  113 +++
>  cpt_exports.c   |   13 
>  cpt_files.c     | 1626 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  cpt_files.h     |   71 ++
>  cpt_fsmagic.h   |   16 
>  cpt_inotify.c   |  144 ++++
>  cpt_kernel.c    |  177 ++++++
>  cpt_kernel.h    |   99 +++
>  cpt_mm.c        |  923 +++++++++++++++++++++++++++++++
>  cpt_mm.h        |   35 +
>  cpt_net.c       |  614 ++++++++++++++++++++
>  cpt_net.h       |    7 
>  cpt_obj.c       |  162 +++++
>  cpt_obj.h       |   62 ++
>  cpt_proc.c      |  595 ++++++++++++++++++++
>  cpt_process.c   | 1369 ++++++++++++++++++++++++++++++++++++++++++++++
>  cpt_process.h   |   13 
>  cpt_socket.c    |  790 ++++++++++++++++++++++++++
>  cpt_socket.h    |   33 +
>  cpt_socket_in.c |  450 +++++++++++++++
>  cpt_syscalls.h  |  101 +++
>  cpt_sysvipc.c   |  403 +++++++++++++
>  cpt_tty.c       |  215 +++++++
>  cpt_ubc.c       |  132 ++++
>  cpt_ubc.h       |   23 
>  cpt_x8664.S     |   67 ++
>  rst_conntrack.c |  283 +++++++++
>  rst_context.c   |  323 ++++++++++
>  rst_epoll.c     |  169 +++++
>  rst_files.c     | 1648 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  rst_inotify.c   |  196 ++++++
>  rst_mm.c        | 1151 +++++++++++++++++++++++++++++++++++++++
>  rst_net.c       |  741 +++++++++++++++++++++++++
>  rst_proc.c      |  580 +++++++++++++++++++
>  rst_process.c   | 1640 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  rst_socket.c    |  918 +++++++++++++++++++++++++++++++
>  rst_socket_in.c |  489 ++++++++++++++++
>  rst_sysvipc.c   |  633 +++++++++++++++++++++
>  rst_tty.c       |  384 +++++++++++++
>  rst_ubc.c       |  131 ++++
>  rst_undump.c    | 1007 ++++++++++++++++++++++++++++++++++
>  47 files changed, 20702 insertions(+)
> 
> One important thing that leaves out is the interaction that this code
> has with the rest of the kernel.  That's critically important when
> considering long-term maintenance, and I'd be curious how the OpenVZ
> folks view it. 

OpenVZ as-is in some cases wants some functions to be made global
(and if C/R code will be modular, exported). Or probably several
iterators added.

But it's negligible amount of changes compared to main code.
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