linux-kernel - Re: [RFC v7][PATCH 0/9] Kernel based checkpoint/restart

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Message-Id: <20081021122135.4bce362c.akpm@linux-foundation.org>
Date:	Tue, 21 Oct 2008 12:21:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	torvalds@...ux-foundation.org,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, tglx@...utronix.de, serue@...ibm.com,
	dave@...ux.vnet.ibm.com, mingo@...e.hu, hpa@...or.com,
	viro@...iv.linux.org.uk, orenl@...columbia.edu
Subject: Re: [RFC v7][PATCH 0/9] Kernel based checkpoint/restart

On Mon, 20 Oct 2008 01:40:28 -0400
Oren Laadan <orenl@...columbia.edu> wrote:

> These patches implement basic checkpoint-restart [CR]. This version
> (v7) supports basic tasks with simple private memory, and open files
> (regular files and directories only).

This is a problem.  I wouldn't want to be in a position where we merge
this code in mainline, but it's just a not-very-useful toy.  Then, as
we turn it into a useful non-toy it all turns into an utter mess.

IOW, merging this code as-is will commit us to merging more code which
hasn't even been written yet.  It might even commit us to solving
thus-far-unknown problems which we don't know how to solve!

It's a big blank cheque.

So.

- how useful is this code as it stands in real-world usage?

- what additional work needs to be done to it?  (important!)

- how far are we down the design and implementation path with that new
  work?  Are we yet at least in a position where we can say "yes, this
  feature can be completed and no, it won't be a horrid mess"?

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