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

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

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From: Greg Kurz

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

Date: Monday, October 13, 2008 - 1:18 am

On Fri, 2008-10-10 at 11:18 -0600, Chris Friesen wrote:
quoted text> 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.

quoted text> 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@fr.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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Messages in current thread:

[RFC][PATCH 1/2] Track in-kernel when we expect checkpoint ..., Dave Hansen, (Thu Oct 9, 12:04 pm)

[RFC][PATCH 2/2] first callers of process_deny_checkpoint(), Dave Hansen, (Thu Oct 9, 12:04 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Serge E. Hallyn, (Thu Oct 9, 12:43 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Dave Hansen, (Thu Oct 9, 1:54 pm)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Greg Kurz, (Fri Oct 10, 1:20 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Daniel Lezcano, (Fri Oct 10, 1:37 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Daniel Lezcano, (Fri Oct 10, 1:41 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Ingo Molnar, (Fri Oct 10, 1:46 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Greg Kurz, (Fri Oct 10, 1:47 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Oren Laadan, (Fri Oct 10, 3:11 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Cedric Le Goater, (Fri Oct 10, 3:17 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Cedric Le Goater, (Fri Oct 10, 3:27 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Rafael J. Wysocki, (Fri Oct 10, 6:17 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Serge E. Hallyn, (Fri Oct 10, 7:04 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Ingo Molnar, (Fri Oct 10, 7:54 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Ingo Molnar, (Fri Oct 10, 7:59 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Oren Laadan, (Fri Oct 10, 8:17 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Ingo Molnar, (Fri Oct 10, 8:28 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Dave Hansen, (Fri Oct 10, 9:33 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Greg Kurz, (Fri Oct 10, 9:34 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Dave Hansen, (Fri Oct 10, 9:36 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Greg Kurz, (Fri Oct 10, 9:45 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Serge E. Hallyn, (Fri Oct 10, 10:13 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Chris Friesen, (Fri Oct 10, 10:18 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Dave Hansen, (Fri Oct 10, 10:28 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Ingo Molnar, (Fri Oct 10, 12:53 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Rafael J. Wysocki, (Fri Oct 10, 12:53 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Len Brown, (Fri Oct 10, 1:40 pm)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Daniel Lezcano, (Fri Oct 10, 1:57 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Rafael J. Wysocki, (Fri Oct 10, 3:57 pm)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Pavel Machek, (Sat Oct 11, 6:48 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Ingo Molnar, (Sat Oct 11, 8:00 am)

Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkp ..., Greg Kurz, (Mon Oct 13, 1:18 am)

Re: [RFC][PATCH 2/2] first callers of process_deny_checkpo ..., Greg Kurz, (Mon Oct 13, 1:20 am)