To: linux-kernel@vger.kernel.org
From: Stephen Hemminger <shemminger@osdl.org>
Subject: Re: [PATCH 0/9] namespaces: Introduction
Date: Fri, 19 May 2006 10:15:47 -0700
Organization: OSDL
Message-ID: <20060519101547.2614ec60@localhost.localdomain>
References: <20060518154700.GA28344@sergelap.austin.ibm.com>
	<20060518103430.080e3523.akpm@osdl.org>
	<20060519124235.GA32304@MAIL.13thfloor.at>
	<20060519081334.06ce452d.akpm@osdl.org>
	<m1iro2yo7f.fsf@ebiederm.dsl.xmission.com>
	<20060519094047.425dced1.akpm@osdl.org>
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On Fri, 19 May 2006 09:40:47 -0700
Andrew Morton <akpm@osdl.org> wrote:

> ebiederm@xmission.com (Eric W. Biederman) wrote:
> >
> >  > Herbert Poetzl <herbert@13thfloor.at> wrote:
> >  >>
> >  >> let me
> >  >>  give a simple example here:
> >  >
> >  > Examples are useful.
> >  >
> >  >>   "pid virtualization"
> >  >> 
> >  >>   - Linux-VServer doesn't really need that right now.
> >  >>     we are perfectly fine with "pid isolation" here, we
> >  >>     only "virtualize" the init pid to make pstree happy
> >  >> 
> >  >>   - Snapshot/Restart and Migration will require "full"
> >  >>     pid virtualization (that's where Eric and OpenVZ
> >  >>     are heading towards)
> >  >
> >  > snapshot/restart/migration worry me.  If they require complete
> >  > serialisation of complex kernel data structures then we have a problem,
> >  > because it means that any time anyone changes such a structure they need to
> >  > update (and test) the serialisation.
> > 
> >  There is a strict limit to what is user visible, and if it isn't user visible
> >  we will never need it in a checkpoint.  So internal implementation details
> >  should not matter.
> 
> Migration of currently-open sockets (for example) would require storing of
> a lot of state, wouldn't it?

Werner has demonstrated TCP connection passing
	http://tcpcp.sourceforge.net/
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