linux-kernel - Re: [PATCH RFC] pram: persistent over-kexec memory file system

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Message-ID: <51F3EA2A.3090905@gmail.com>
Date:	Sat, 27 Jul 2013 17:41:30 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, criu@...nvz.org, devel@...nvz.org,
	xemul@...allels.com
Subject: Re: [PATCH RFC] pram: persistent over-kexec memory file system

Il 26/07/2013 14:29, Vladimir Davydov ha scritto:
> Hi,
>
> We want to propose a way to upgrade a kernel on a machine without
> restarting all the user-space services. This is to be done with CRIU
> project, but we need help from the kernel to preserve some data in
> memory while doing kexec.
>
> The key point of our implementation is leaving process memory in-place
> during reboot. This should eliminate most io operations the services
> would produce during initialization. To achieve this, we have
> implemented a pseudo file system that preserves its content during
> kexec. We propose saving CRIU dump files to this file system, kexec'ing
> and then restoring the processes in the newly booted kernel.
>

http://pramfs.sourceforge.net/

Marco

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