linux-kernel - Re: Back to the future.

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Message-ID: <20070503171843.GA4355@ucw.cz>
Date:	Thu, 3 May 2007 17:18:43 +0000
From:	Pavel Machek <pavel@....cz>
To:	David Lang <david.lang@...italinsight.com>
Cc:	Nigel Cunningham <nigel@...el.suspend2.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Back to the future.

Hi!

> nobody is suggesting that you leave peocesses running 
> while you do the snapshot, what is being proposed is
> 
> 1. pause userspace (prevent scheduling)
> 2. make snapshot image of memory
> 3. make mounted filesystems read-only (possibly with 
> snapshot/checkpoint)
> 4. unpause
> 5. save image (with full userspace available, including 
> network)

Including network? Your tcp peers will be really confused, then, if
you ACK packets then claim you did not get them. No, you do not want
to start network.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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