linux-kernel - Re: What can OpenVZ do?

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Date:	Fri, 13 Mar 2009 19:26:56 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	tglx@...utronix.de, viro@...iv.linux.org.uk, hpa@...or.com,
	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: What can OpenVZ do?

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Alexey Dobriyan <adobriyan@...il.com> writes:
> 
> > On Fri, Feb 13, 2009 at 12:45:03PM +0100, Ingo Molnar wrote:
> >> 
> >> * Alexey Dobriyan <adobriyan@...il.com> wrote:
> >> 
> >> > On Fri, Feb 13, 2009 at 11:27:32AM +0100, Ingo Molnar wrote:
> >> > > Merging checkpoints instead might give them the incentive to get
> >> > > their act together.
> >> > 
> >> > Knowing how much time it takes to beat CPT back into usable shape every time
> >> > big kernel rebase is done, OpenVZ/Virtuozzo have every single damn incentive
> >> > to have CPT mainlined.
> >> 
> >> So where is the bottleneck? I suspect the effort in having forward ported
> >> it across 4 major kernel releases in a single year is already larger than
> >> the technical effort it would  take to upstream it. Any unreasonable upstream 
> >> resistence/passivity you are bumping into?
> >
> > People were busy with netns/containers stuff and OpenVZ/Virtuozzo bugs.
> 
> Yes.  Getting the namespaces particularly the network namespace finished
> has consumed a lot of work.
> 
> Then we have a bunch of people helping with ill conceived patches that seem
> to wear out the patience of people upstream.  Al, Greg kh, Linus.
> 
> The whole recent ressurection of the question of we should have a clone
> with pid syscall.

/me points

Alexey started it :)

But, Linus asks to start with simple checkpoint/restart patches.  Oren's
basic patchset pretty much does that, though, right?  Patches 1-7 just
do a basic single task.  8-10 add simple open files.  11, 13 and 14 do
external checkpoint and multiple tasks.

Are these an ok place to start, or do these need to be simplified even
more?

-serge
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