linux-kernel - Re: Checkpoint/restart (was Re: [PATCH 0/4] - v2

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Date:	Thu, 17 Jul 2008 19:14:25 -0400
From:	Oren Laadan <orenl@...columbia.edu>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kirill Korotaev <dev@...allels.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Nadia.Derbey@...l.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	nick@...k-andrew.net, Alexey Dobriyan <adobriyan@...il.com>,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: Checkpoint/restart (was Re: [PATCH 0/4] - v2 - Object creation
 with a specified id)



Dave Hansen wrote:
> On Wed, 2008-07-09 at 18:58 -0700, Eric W. Biederman wrote:
>> In the worst case today we can restore a checkpoint by replaying all of
>> the user space actions that took us to get there.  That is a tedious
>> and slow approach.
> 
> Yes, tedious and slow, *and* minimally invasive in the kernel.  Once we
> have a tedious and slow process, we'll have some really good points when

"Replaying all of the user space actions that took us to get there" -
this task is not even always possible without deterministic log/replay
mechanism :(

Oren.

> we try to push the next set of patches to make it less slow and tedious.
> We'll be able to describe an _actual_ set of problems to our fellow
> kernel hackers.
> 
> So, the checkpoint-as-a-corefile idea sounds good to me, but it
> definitely leaves a lot of questions about exactly how we'll need to do
> the restore.
> 
> -- Dave
> 
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