linux-kernel - Re: [RFC][PATCH 1/4] checkpoint-restart: general infrastructure

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Message-Id: <1218242614.19082.65.camel@nimitz>
Date:	Fri, 08 Aug 2008 17:43:34 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	containers@...ts.linux-foundation.org,
	Theodore Tso <tytso@....edu>, linux-kernel@...r.kernel.org,
	Oren Laadan <orenl@...columbia.edu>
Subject: Re: [RFC][PATCH 1/4] checkpoint-restart: general infrastructure

On Sat, 2008-08-09 at 00:39 +0200, Arnd Bergmann wrote:
> The main problem I see with that would be atomicity: If you want multiple
> processes to keep interacting with each other, you need to save them at
> the same point in time, which gets harder as you split your interface into
> more than a single file descriptor.

It could take ages to write out a checkpoint even to a single fd, so I
suspect we'd have the exact same kinds of issues either way.

-- Dave

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