linux-kernel - Re: Back to the future.

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Message-ID: <20070507124818.GA18209@elf.ucw.cz>
Date:	Mon, 7 May 2007 14:48:18 +0200
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.
> 
> anyone who is doing a hibernate or suspend who expect all the network 
> connections to be working afterwords is dreaming or smokeing
>something.

Really? It works today... if the suspend is short enough. And that's
how it should be.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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