Date: Fri, 19 May 2006 09:40:47 -0700
From: Andrew Morton <akpm@osdl.org>
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: herbert@13thfloor.at, serue@us.ibm.com, linux-kernel@vger.kernel.org,
       dev@sw.ru, devel@openvz.org, sam@vilain.net, xemul@sw.ru,
       haveblue@us.ibm.com, clg@fr.ibm.com
Subject: Re: [PATCH 0/9] namespaces: Introduction
Message-Id: <20060519094047.425dced1.akpm@osdl.org>
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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?
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