linux-kernel - Re: [PATCH 0/2 -mm] kexec based hibernation -v5

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Message-Id: <200710111217.58473.rjw@sisk.pl>
Date:	Thu, 11 Oct 2007 12:17:57 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH 0/2 -mm] kexec based hibernation -v5

On Thursday, 11 October 2007 04:13, Huang, Ying wrote:
> Kexec base hibernation has some potential advantages over uswsusp and
> TuxOnIce (suspend2). Some most obvious advantages are:

Well, I have some doubts as far as the obviousness is concerned.

> 1. The hibernation image size can exceed half of memory size easily.

This is also possible with TuxOnIce.

> 2. The hibernation image can be written to and read from almost
>    anywhere, such as USB disk, NFS.

This is possible with uswsusp, at least in theory, probably with TuxOnIce too.

> 3. It is possible to eliminate freezer from kexec based hibernation
>    implementation.

This isn't true as long as we have not changed the handling of devices
(which is in the works, but will take time).

> 4. Based on kexec/kdump implementation, the kernel code needed is
>    less.

Well, maybe.

Greetings,
Rafael
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