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

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Message-Id: <1223885897.4404.5.camel@localhost.localdomain>
Date:	Mon, 13 Oct 2008 10:18:17 +0200
From:	Greg Kurz <gkurz@...ibm.com>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Oren Laadan <orenl@...columbia.edu>, Ingo Molnar <mingo@...e.hu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	containers@...ts.linux-foundation.org, arnd@...db.de,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/2] Track in-kernel when we	expect
	checkpoint/restart to work

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.

> 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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