linux-kernel - Re: [PATCH 0/3 -mm] kexec jump -v8

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Message-ID: <476B7ACF.8020602@nigel.suspend2.net>
Date:	Fri, 21 Dec 2007 19:35:27 +1100
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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH 0/3 -mm] kexec jump -v8

Hi.

Huang, Ying wrote:
> This patchset provides an enhancement to kexec/kdump. It implements
> the following features:
> 
> - Backup/restore memory used both by the original kernel and the
>   kexeced kernel.

Why the kexeced kernel as well?

[...]

> The features of this patchset can be used as follow:
> 
> - Kernel/system debug through making system snapshot. You can make
>   system snapshot, jump back, do some thing and make another system
>   snapshot.

Are you somehow recording all the filesystem changes after the first
snapshot? If not, this is pointless (you'll end up with filesystem
corruption).

[...]

> - Cooperative multi-kernel/system. With kexec jump, you can switch
>   between several kernels/systems quickly without boot process except
>   the first time. This appears like swap a whole kernel/system out/in.

How is this useful to the end user?

Regards,

Nigel


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