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Date: Fri, 21 Dec 2007 19:35:27 +1100
From: Nigel Cunningham <nigel@nigel.suspend2.net>
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To: "Huang, Ying" <ying.huang@intel.com>
CC: "Eric W. Biederman" <ebiederm@xmission.com>, Pavel Machek <pavel@ucw.cz>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       linux-pm@lists.linux-foundation.org,
       Kexec Mailing List <kexec@lists.infradead.org>
Subject: Re: [PATCH 0/3 -mm] kexec jump -v8
References: <1198222399.1965.15.camel@caritas-dev.intel.com>
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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