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

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Message-ID: <20101119035403.GA24031@hallyn.com>
Date:	Thu, 18 Nov 2010 21:54:03 -0600
From:	Serge Hallyn <serge.hallyn@...onical.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Kapil Arya <kapil@....neu.edu>,
	Gene Cooperman <gene@....neu.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

Quoting Tejun Heo (tj@...nel.org):
> * And, most of all, there are userland implementation and
>   virtualization, making the benefit to overhead ratio completely off.
>   Userland implementation _already_ achieves most of what's necessary

Guess I'll just be offensive here and say, straight-out:  I don't
believe it.  Can I see the userspace implementation of c/r?

If it's as good as the kernel level c/r, then aweseome - we don't
need the kernel patches.

If it's not as good, then the thing is, we're not drawing arbitrary
lines saying "is this good enough", rather we want completely
reliable and transparent c/r.  IOW, the running task and the other
end can't tell that a migration happened, and, if checkpoint says
it worked, then restart must succeed.

-serge
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