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

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Message-ID: <AANLkTikRHuaCpaROtty6X_Oe6JixzgcbVsxHxvtsu+UV@mail.gmail.com>
Date:	Fri, 19 Nov 2010 18:00:22 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Tejun Heo <tj@...nel.org>
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

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.

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

>> - 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.
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