From: Paul Mackerras <paulus@samba.org>
To: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Alan Stern <stern@rowland.harvard.edu>,
david@lang.hm, Miklos Szeredi <miklos@szeredi.hu>,
nigel@suspend2.net, linux-kernel@vger.kernel.org,
miltonm@bga.com, ying.huang@intel.com,
linux-pm@lists.linux-foundation.org,
Jeremy Maitin-Shepard <jbms@cmu.edu>
Subject: Re: [linux-pm] Re: Hibernation considerations
Date: Mon, 23 Jul 2007 10:04:43 +1000 [thread overview]
Message-ID: <18083.61595.217126.824924@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <200707230842.22121.nigel@nigel.suspend2.net>
Nigel Cunningham writes:
> I guess I want to persist because all of these issues aren't utterly
> unsolvable. It's just that we don't have the infrastructure yet to
> figure out the solutions to these issues trivially. Take, for example,
Ever heard of the halting problem? :) It's not just a matter of
infrastructure. You very quickly get into questions that are
mathematically undecideable.
> the locking issue. If we could call some function to say "What process
> holds this lock?", then task A could know that it's waiting on task B
> and put that information somewhere. We could then use the information
> to freeze task B before task A.
But how would that help? If task B holds the lock, then we can't
freeze it until it's released the lock. Then the question is, what
does task B need in order to get to the point where it releases the
lock? And so on. It rapidly gets not just extremely messy, but
actually impossible to compute in general.
Paul.
next prev parent reply other threads:[~2007-07-23 0:04 UTC|newest]
Thread overview: 220+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-15 12:33 Rafael J. Wysocki
2007-07-15 12:51 ` Nigel Cunningham
2007-07-15 12:58 ` Dr. David Alan Gilbert
2007-07-15 22:38 ` Rafael J. Wysocki
2007-07-15 22:27 ` david
2007-07-17 17:40 ` Dr. David Alan Gilbert
2007-07-17 17:49 ` david
2007-07-29 6:53 ` Vojtech Pavlik
2007-07-29 9:56 ` Rafael J. Wysocki
2007-08-05 19:56 ` encrypted hibernation (was Re: Hibernation considerations) Pavel Machek
2007-08-11 23:43 ` Dr. David Alan Gilbert
2007-08-12 22:12 ` Rafael J. Wysocki
2007-08-18 19:37 ` Dr. David Alan Gilbert
2007-08-21 7:29 ` Pavel Machek
2007-08-13 2:30 ` Michael Chang
2007-08-13 4:53 ` alon.barlev
2007-07-15 15:10 ` Hibernation considerations Al Boldi
2007-07-15 15:35 ` jimmy bahuleyan
2007-07-15 17:40 ` Al Boldi
2007-07-15 16:29 ` Alan Stern
2007-07-15 17:40 ` Al Boldi
2007-07-15 23:28 ` Alan Stern
2007-07-15 23:58 ` david
2007-07-16 5:02 ` Al Boldi
2007-07-16 6:49 ` david
2007-07-16 13:32 ` Al Boldi
2007-07-17 4:33 ` david
2007-07-17 12:08 ` Al Boldi
2007-07-17 14:18 ` Rafael J. Wysocki
2007-07-17 15:23 ` david
2007-07-16 14:53 ` Alan Stern
2007-07-16 16:51 ` Al Boldi
2007-07-17 4:37 ` david
2007-07-15 19:52 ` david
2007-07-15 20:13 ` david
2007-07-15 22:47 ` Rafael J. Wysocki
2007-07-15 22:42 ` david
2007-07-15 23:15 ` Alan Stern
2007-07-15 23:38 ` Nigel Cunningham
2007-07-16 14:15 ` Alan Stern
2007-07-16 15:25 ` Rafael J. Wysocki
2007-07-15 23:41 ` david
2007-07-16 14:21 ` Alan Stern
2007-07-17 4:45 ` david
2007-07-17 14:15 ` Alan Stern
2007-07-17 14:40 ` Rafael J. Wysocki
2007-07-17 15:29 ` david
2007-07-17 16:02 ` Rafael J. Wysocki
2007-07-17 17:06 ` david
2007-07-17 19:50 ` Rafael J. Wysocki
2007-07-17 20:18 ` david
2007-07-17 20:39 ` Jeremy Maitin-Shepard
2007-07-17 20:39 ` david
2007-07-17 20:58 ` Rafael J. Wysocki
2007-07-17 20:57 ` Rafael J. Wysocki
2007-07-17 20:53 ` david
2007-07-17 21:37 ` Rafael J. Wysocki
2007-07-17 21:42 ` david
2007-07-17 21:53 ` Jeremy Maitin-Shepard
2007-07-21 10:25 ` Pavel Machek
2007-07-21 15:35 ` Jeremy Maitin-Shepard
2007-07-21 17:56 ` Pavel Machek
2007-07-21 19:35 ` david
2007-07-21 19:49 ` Pavel Machek
2007-07-21 22:14 ` david
2007-08-01 16:58 ` Stefan Seyfried
2007-07-17 20:24 ` Jeremy Maitin-Shepard
2007-07-17 20:44 ` david
2007-07-17 21:00 ` Rafael J. Wysocki
2007-07-17 16:09 ` Jeremy Maitin-Shepard
2007-07-17 19:54 ` Rafael J. Wysocki
2007-07-17 18:32 ` Alan Stern
2007-07-17 20:17 ` Rafael J. Wysocki
2007-07-17 20:34 ` david
2007-07-17 20:54 ` Jeremy Maitin-Shepard
2007-07-17 21:04 ` david
2007-07-17 21:23 ` Rafael J. Wysocki
2007-07-17 21:17 ` david
2007-07-17 21:27 ` Jeremy Maitin-Shepard
2007-07-17 21:27 ` david
2007-07-17 21:54 ` Rafael J. Wysocki
2007-07-17 21:45 ` Rafael J. Wysocki
2007-07-17 21:43 ` Rafael J. Wysocki
2007-07-17 20:34 ` Jeremy Maitin-Shepard
2007-07-17 20:37 ` david
2007-07-17 20:56 ` Jeremy Maitin-Shepard
2007-07-17 21:06 ` david
2007-07-17 21:40 ` Rafael J. Wysocki
2007-07-17 21:24 ` Rafael J. Wysocki
2007-07-17 21:11 ` Rafael J. Wysocki
2007-07-17 20:27 ` david
2007-07-17 21:20 ` Rafael J. Wysocki
[not found] ` <ea7a437ca4038d408ac544bbc3c2434a@bga.com>
2007-07-19 17:31 ` [linux-pm] " david
2007-07-20 14:24 ` Milton Miller
2007-07-20 15:44 ` david
2007-07-19 20:28 ` Rafael J. Wysocki
2007-07-19 23:07 ` david
2007-07-20 11:17 ` Rafael J. Wysocki
2007-07-20 15:35 ` david
2007-07-20 16:15 ` Alan Stern
2007-07-20 21:46 ` Rafael J. Wysocki
2007-07-20 16:56 ` Milton Miller
2007-07-20 17:31 ` Jeremy Maitin-Shepard
2007-07-20 21:30 ` Rafael J. Wysocki
2007-07-20 19:26 ` david
2007-07-20 21:28 ` Rafael J. Wysocki
2007-07-20 21:33 ` Jeremy Maitin-Shepard
2007-07-20 22:19 ` Rafael J. Wysocki
[not found] ` <20070720152744.GH20529@grifter.jdc.home>
2007-07-20 15:36 ` david
2007-07-20 21:43 ` Rafael J. Wysocki
2007-07-20 21:39 ` david
2007-07-20 22:22 ` Rafael J. Wysocki
2007-07-20 22:39 ` david
2007-07-20 16:08 ` Milton Miller
2007-07-20 16:20 ` Alan Stern
2007-07-20 17:32 ` Milton Miller
2007-07-20 18:17 ` Alan Stern
2007-07-20 19:08 ` Milton Miller
2007-07-20 19:37 ` Alan Stern
2007-07-20 20:03 ` Oliver Neukum
2007-07-20 20:12 ` Alan Stern
2007-07-20 21:35 ` Oliver Neukum
2007-07-20 22:25 ` Alan Stern
2007-07-23 14:23 ` Oliver Neukum
2007-07-23 20:05 ` Towards eliminating the freezer Alan Stern
2007-07-24 8:21 ` Oliver Neukum
2007-07-24 14:27 ` Alan Stern
2007-07-24 9:33 ` Rafael J. Wysocki
2007-07-24 14:29 ` Alan Stern
2007-07-24 15:24 ` Rafael J. Wysocki
2007-07-24 16:06 ` Alan Stern
2007-07-24 19:20 ` Rafael J. Wysocki
2007-07-24 20:24 ` Alan Stern
2007-07-24 21:14 ` Rafael J. Wysocki
2007-07-24 22:14 ` Alan Stern
2007-07-25 12:23 ` Rafael J. Wysocki
2007-08-01 9:34 ` [linux-pm] Re: Hibernation considerations Pavel Machek
2007-08-03 3:50 ` david
2007-07-20 20:31 ` david
2007-07-20 21:24 ` Alan Stern
2007-07-20 21:34 ` david
2007-07-20 22:15 ` Rafael J. Wysocki
2007-07-20 21:37 ` Jeremy Maitin-Shepard
2007-07-20 22:35 ` Alan Stern
2007-07-20 22:43 ` david
2007-07-21 5:21 ` Nigel Cunningham
2007-07-21 14:10 ` Alan Stern
2007-07-22 3:43 ` david
2007-07-22 16:00 ` Alan Stern
2007-07-22 21:50 ` david
2007-07-23 15:19 ` Alan Stern
2007-07-23 19:01 ` david
2007-07-23 20:22 ` Alan Stern
2007-07-24 13:26 ` Huang, Ying
2007-07-24 14:50 ` Alan Stern
2007-07-20 22:48 ` Jeremy Maitin-Shepard
2007-07-20 21:02 ` Rafael J. Wysocki
2007-07-21 11:44 ` Miklos Szeredi
2007-07-21 12:43 ` Nigel Cunningham
2007-07-21 13:56 ` Alan Stern
2007-07-21 16:13 ` Jeremy Maitin-Shepard
2007-07-21 18:12 ` Miklos Szeredi
2007-07-21 19:20 ` Rafael J. Wysocki
2007-08-01 9:22 ` Pavel Machek
2007-08-02 17:02 ` Rafael J. Wysocki
2007-07-21 22:21 ` Nigel Cunningham
2007-07-21 22:16 ` Nigel Cunningham
2007-07-22 15:26 ` Alan Stern
2007-07-22 16:27 ` Miklos Szeredi
2007-07-22 20:09 ` Alan Stern
2007-07-22 21:54 ` david
2007-07-22 22:42 ` Nigel Cunningham
2007-07-22 23:09 ` Rafael J. Wysocki
2007-07-22 23:18 ` Nigel Cunningham
2007-07-23 0:04 ` Paul Mackerras [this message]
2007-07-23 3:11 ` Nigel Cunningham
2007-07-23 15:23 ` Alan Stern
2007-07-23 21:55 ` Nigel Cunningham
2007-07-23 22:10 ` Rafael J. Wysocki
2007-07-23 5:31 ` david
2007-07-23 10:24 ` Miklos Szeredi
2007-07-23 12:08 ` Rafael J. Wysocki
2007-07-23 12:14 ` Miklos Szeredi
2007-07-23 12:27 ` Rafael J. Wysocki
2007-07-23 12:31 ` Oliver Neukum
2007-07-23 13:08 ` Miklos Szeredi
2007-07-23 14:01 ` Rafael J. Wysocki
2007-07-23 14:01 ` Miklos Szeredi
2007-07-23 19:08 ` david
2007-08-01 9:19 ` Pavel Machek
[not found] ` <40fa2626aff7b6b590ad6aa4737fc873@bga.com>
2007-07-20 14:48 ` Huang, Ying
2007-07-20 15:48 ` david
2007-07-22 2:17 ` Huang, Ying
2007-07-22 2:32 ` david
2007-07-20 21:34 ` Rafael J. Wysocki
2007-07-17 22:38 ` Alan Stern
2007-07-17 22:37 ` david
2007-07-18 14:29 ` Alan Stern
2007-07-18 14:47 ` Rafael J. Wysocki
2007-07-20 4:40 ` Al Boldi
2007-07-20 10:59 ` Rafael J. Wysocki
2007-07-21 10:17 ` Pavel Machek
2007-07-15 23:22 ` Rafael J. Wysocki
2007-07-15 23:49 ` david
2007-07-16 12:06 ` Rafael J. Wysocki
[not found] ` <20070716123849.GC14212@grifter.jdc.home>
2007-07-16 15:29 ` Rafael J. Wysocki
2007-07-17 4:28 ` david
2007-07-17 10:42 ` Matthew Garrett
2007-07-17 15:19 ` david
2007-07-18 2:18 ` Matthew Garrett
2007-07-18 3:54 ` david
2007-07-18 11:10 ` Matthew Garrett
2007-07-18 12:56 ` david
2007-07-15 23:17 ` Alan Stern
2007-07-15 23:53 ` david
2007-07-16 5:18 ` Jeremy Maitin-Shepard
2007-07-15 20:35 ` Cornelius Riemenschneider
2007-07-15 19:46 ` david
2007-07-16 0:51 ` Matthew Garrett
2007-07-16 0:51 ` david
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