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From: Pavel Machek <pavel@ucw.cz>
To: Kyle Moffett <mrmacman_g4@mac.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	David Chinner <dgc@sgi.com>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	xfs-masters@oss.sgi.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: freeze vs freezer
Date: Wed, 2 Jan 2008 17:02:34 +0100	[thread overview]
Message-ID: <20080102160234.GA17070@ucw.cz> (raw)
In-Reply-To: <8B00F353-983F-40E7-931B-EA73CCD32F0A@mac.com>

Hi!

> >>>>So how do you handle threads that are blocked on I/O or a lock  
> >>>>during the system freeze process, then?
> >>>
> >>>We wait until they can continue.
> >>
> >>So if I have a process blocked on an unavilable NFS mount, I can't
> >>suspend?
> >
> >That's correct, you can't.
> >
> >[And I know what you're going to say. ;-)]
> 
> Why exactly does suspend/hibernation depend on "TASK_INTERRUPTIBLE"  
> instead of a zero preempt_count()?  Really what we should do is just  
> iterate over all of the actual physical devices and tell each one  
> "Block new IO requests preemptably, finish pending DMA, put the  
> hardware in low-power mode, and prepare for suspend/hibernate".  As  
> long as each driver knows how to do those simple things we can have  
> an entirely consistent kernel image for both suspend and for  
> hibernation.

"each driver" means this is a lot of work. But yes, that is probably
way to go, and patch would be welcome.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2008-01-02 16:03 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-22  3:54 freeze vs freezer Jeremy Fitzhardinge
2007-11-23 23:47 ` Rafael J. Wysocki
2007-11-26 18:44   ` Jeremy Fitzhardinge
2007-11-26 21:20     ` Rafael J. Wysocki
2007-11-26 21:17   ` David Chinner
2007-11-26 21:53     ` Rafael J. Wysocki
2007-11-27  5:38       ` Matthew Garrett
2007-11-27 17:40         ` Rafael J. Wysocki
2007-11-27 20:33           ` Kyle Moffett
2007-11-27 23:01             ` Rafael J. Wysocki
2007-11-27 22:49               ` Jeremy Fitzhardinge
2007-11-27 23:14                 ` Kyle Moffett
2007-11-27 23:32                   ` Jeremy Fitzhardinge
2008-01-02 16:02             ` Pavel Machek [this message]
2008-01-02 21:30               ` Nigel Cunningham
2008-01-02 22:04                 ` Rafael J. Wysocki
2008-01-03  9:19                   ` Nigel Cunningham
2008-01-03  9:47                     ` Oliver Neukum
2008-01-03  9:52                       ` Nigel Cunningham
2008-01-03 11:15                         ` Oliver Neukum
2008-01-03 22:06                           ` Nigel Cunningham
2008-01-04 20:54                             ` Oliver Neukum
2008-01-05  1:38                               ` Kyle Moffett
2008-01-05 21:18                               ` Pavel Machek
2008-01-05 23:01                                 ` Nigel Cunningham
2008-01-03 22:31                     ` Rafael J. Wysocki
2008-06-23  7:16             ` Pavel Machek
2008-06-23 14:00               ` Henrique de Moraes Holschuh
2008-06-24  8:08                 ` Elias Oltmanns
2008-06-26 15:09                   ` Pavel Machek
2008-06-29 22:12                     ` [xfs-masters] " Dave Chinner
2008-06-29 23:22                       ` Rafael J. Wysocki
2008-06-30  6:11                         ` Christoph Hellwig
2008-06-30 20:34                           ` Rafael J. Wysocki
2008-07-03 19:43                             ` Eric Sandeen
2008-06-30  6:29                         ` Dave Chinner
2008-06-30  6:37                           ` Jeremy Fitzhardinge
2008-06-30 12:33                             ` Dave Chinner
2008-06-30 21:00                               ` Rafael J. Wysocki
2008-06-30 22:21                                 ` Dave Chinner
2008-06-30 22:38                                   ` Rafael J. Wysocki
2008-07-01  6:38                                     ` Dave Chinner
2008-07-01 14:35                                       ` Rafael J. Wysocki
2008-07-01 15:05                                         ` Elias Oltmanns
2008-07-01 15:17                                           ` Christoph Hellwig
2008-07-01 21:15                                           ` Dave Chinner
2008-07-01 21:46                                             ` Elias Oltmanns
2008-07-01 21:12                                         ` Dave Chinner
2008-07-01 21:21                                           ` Rafael J. Wysocki
2008-07-01  8:59                             ` Pavel Machek

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