linux-kernel - Re: What can OpenVZ do?

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Date:	Fri, 13 Feb 2009 01:17:41 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <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,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: What can OpenVZ do?

On Thu, Feb 12, 2009 at 01:51:23PM -0800, Dave Hansen wrote:
> On Thu, 2009-02-12 at 11:42 -0800, Andrew Morton wrote:
> > 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?
> 
> I also believe it is "fairly complete".  At least able to be used
> practically.
> 
> > 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?
> 
> Yes, we can certainly use it as a guide.  However, there are some
> barriers to being able to do that:
> 
> dave@...itz:~/kernels/linux-2.6-openvz$ git diff v2.6.27.10... | diffstat | tail -1
>  628 files changed, 59597 insertions(+), 2927 deletions(-)
> dave@...itz:~/kernels/linux-2.6-openvz$ git diff v2.6.27.10... | wc 
>   84887  290855 2308745

	git-diff -- kernel/cpt/

should give more realistic picture.

> Unfortunately, the git tree doesn't have that great of a history.  It
> appears that the forward-ports are just applications of huge single
> patches which then get committed into git.  This tree has also
> historically contained a bunch of stuff not directly related to
> checkpoint/restart like resource management.

> We'd be idiots not to take a hard look at what has been done in OpenVZ.
> But, for the time being, we have absolutely no shortage of things that
> we know are important and know have to be done.  Our largest problem is
> not finding things to do, but is our large out-of-tree patch that is
> growing by the day. :(
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