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From: Pavel Machek <pavel@suse.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: Mon, 23 Jun 2008 09:16:01 +0200	[thread overview]
Message-ID: <20080623071601.GA1553@elf.ucw.cz> (raw)
In-Reply-To: <8B00F353-983F-40E7-931B-EA73CCD32F0A@mac.com>

Hi!

(replying to *very* old mail).

>>>> 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.

Patch would be welcome, actually. It turns out blocking new
IO-requests is not completely trivial.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2008-06-23  7:50 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-22  3:54 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
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 [this message]
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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