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

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Date:	Fri, 19 Nov 2010 17:06:14 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	Kirill Korotaev <dev@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kapil Arya <kapil@....neu.edu>,
	Gene Cooperman <gene@....neu.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

Hello,

On 11/19/2010 05:00 PM, Alexey Dobriyan wrote:
> On Fri, Nov 19, 2010 at 5:33 PM, Tejun Heo <tj@...nel.org> wrote:
>>> - insert SKB's into socket buffers
>>
>> Can't we drain kernel buffers?  ie. Stop further writing and wait the
>> send-q to drop to zero.
> 
> On send:
> if network dies right after freeze, you lose.

Gosh, if you're really worried about that, put a netfilter module
which would buffer and simulate acks to extract the packets before
initiating freeze.  These are fringe problems.  Use fringe solutions.

> On receive:
> packets arrive after process freeze, but before network device freeze.

Just store the data somewhere.  The checkpointer can drain the socket,
right?

>>> - setting different statistics counters (like netdev stats etc.)
>>> and so on...
>>
>> Why would this matter?
> 
> Because you'll introduce million stupid interfaces not interesting to
> anyone but C/R.

In this thread, how many have you guys come up with?  Not even a dozen
and most can be sovled almost trivially.  Seriously, what the hell..

Thanks.

-- 
tejun
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