linux-kernel - Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

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Message-ID: <20101119041045.GC24031@hallyn.com>
Date:	Thu, 18 Nov 2010 22:10:45 -0600
From:	Serge Hallyn <serge.hallyn@...onical.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Kapil Arya <kapil@....neu.edu>, Gene Cooperman <gene@....neu.edu>,
	linux-kernel@...r.kernel.org, xemul@...ru,
	Linux Containers <containers@...ts.osdl.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

Quoting Tejun Heo (tj@...nel.org):
> Hello, Serge.

Hey Tejun  :)

> On 11/17/2010 04:39 PM, Serge E. Hallyn wrote:
> >> I'm sorry but in-kernel CR already looks like a major misdesign to me.
> > 
> > By this do you mean the very idea of having CR support in the kernel?
> > Or our design of it in the kernel?
> 
> The former, I'm afraid.
> 
> > Let's go back to July 2008, at the containers mini-summit, where it
> > was unanimously agreed upon that the kernel was the right place
> > (Checkpoint/Resetart [CR] under
> > http://wiki.openvz.org/Containers/Mini-summit_2008_notes ), and that
> > we would start by supporting a single task with no resources.  Was
> > that whole discussion effectively misguided, in your opinion?  Or do
> > you feel that since the first steps outlined in that discussion
> > we've either "gone too far" or strayed in the subsequent design?
> 
> The conclusion doesn't seem like such a good idea, well, at least to
> me for what it's worth.  Conclusions at summits don't carry decisive
> weight.

Of course.  It allows us to present at kernel summit and look for early
rejections to save us all some time (which we did, at the container
mini-summit readout at ksummit 2008), but it would be silly to read
anything more into it than that.

> It'll still have to prove its worthiness for mainline all the
> same

100% agreed.

> and in light of already working userland alternative and the

Here's where we disagree.  If you are right about a viable userland
alternative ('already working' isn't even a preqeq in my opinion,
so long as it is really viable), then I'm with you, but I'm not buying
it at this point.

Seriously.  Truly.  Honestly.  I am *not* looking for any extra kernel
work at this moment, if we can help it in any way.

> expanded area now covered by virtualization, the arguments in this
> thread don't seem too strong.

-serge
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