linux-kernel - Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkpoint/restart to work

Open Source and information security mailing list archives

Message-ID: <20081013164559.GA31636@us.ibm.com>
Date:	Mon, 13 Oct 2008 11:46:00 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Greg Kurz <gkurz@...ibm.com>
Cc:	Chris Friesen <cfriesen@...tel.com>, arnd@...db.de,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [RFC][PATCH 1/2] Track in-kernel when we expect
	checkpoint/restart to work

Quoting Greg Kurz (gkurz@...ibm.com):
> On Fri, 2008-10-10 at 11:18 -0600, Chris Friesen wrote:
> > Greg Kurz wrote:
> > 
> > > This flag is weak... testing it gives absolutly no hint whether the
> > > checkpoint may succeed or not. As it is designed now, a user can only be
> > > aware that checkpoint is *forever* denied. I agree that it's only useful
> > > as a "flexible CR todo list".
> > 
> > I don't think it's true that it gives "absolutly no hint".
> > 
> > If the flag is not set, then checkpoint will succeed, right?  Whereas if 
> 
> Wrong. Unless you test_and_checkpoint atomically, the flag doesn't help.

Atomically wrt what?  Presumably you test and checkpoint while the
container is frozen...

> > the flag is set, then it's an indication that checkpoint could fail (but 
> > may still succeed if whatever condition caused the flag to be set is no 
> > longer true).
> > 
> > Chris
> > 
> -- 
> Gregory Kurz                                     gkurz@...ibm.com
> Software Engineer @ IBM/Meiosys                  http://www.ibm.com
> Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420
> 
> "Anarchy is about taking complete responsibility for yourself."
>         Alan Moore.
> 
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