Re: [PATCH 0/9] namespaces: Introduction
From: Andrew Morton
Date: Fri May 19 2006 - 12:54:07 EST
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) wrote:
> > Herbert Poetzl <herbert@xxxxxxxxxxxx> 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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