linux-kernel - Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based hibernation

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Message-Id: <200707151908.05388.nigel@nigel.suspend2.net>
Date:	Sun, 15 Jul 2007 19:08:04 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>, david@...g.hm,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based hibernation

Hi.

On Sunday 15 July 2007 17:13:13 Huang, Ying wrote:
> The complete changelog of the patch is as follow:
> 
> ---
> 
> Kexec base hibernation has some potential advantages over uswsusp and
> TuxOnIce (suspend2). Some most obvious advantages are:
> 
> 1. The hibernation image size can exceed half of memory size easily.
> 2. The hibernation image can be written to and read from almost
>    anywhere, such as USB disk, NFS.

This isn't right. TuxOnIce has no problem with image sizes exceeding half the 
amount of memory, and both uswsusp and TuxOnIce could write to a USB disk/key 
or NFS as well. Historically, the issue with writing to USB devices has been 
an issue with USB device drivers, not hibernation implementations. I haven't 
tried writing an image to USB, but with the work on the drivers, I wouldn't 
be surprised if it was usable now. NFS? Again, I haven't tried, but wouldn't 
expect it to be impossible. I did try writing an image to an NBD device a 
couple of years ago. It didn't quite work, but wasn't far away.

Regards,

Nigel
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