From: David Lang <david.lang@digitalinsight.com>
To: Oliver Neukum <oliver@neukum.org>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Linus Torvalds <torvalds@linux-foundation.org>,
Pekka J Enberg <penberg@cs.helsinki.fi>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Back to the future.
Date: Sat, 28 Apr 2007 11:28:06 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.63.0704281118550.11638@qynat.qvtvafvgr.pbz> (raw)
In-Reply-To: <200704280858.26615.oliver@neukum.org>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 1902 bytes --]
On Sat, 28 Apr 2007, Oliver Neukum wrote:
> Am Samstag, 28. April 2007 01:50 schrieb David Lang:
>> 3. make mounted filesystems read-only (possibly with snapshot/checkpoint)
>> 4. unpause
>> 5. save image (with full userspace available, including network)
>> 6. shutdown system (throw away all userspace memory, no need to do graceful
>> shutdown or nice kill signals, revert filesystem to snapshot/checkpoint if
>> needed)
>
> And then you'll have people wonder why the server which sent out all
> those files has no log entries. You'd have to selectively unfreeze user
> space, which is a cure worse than the desease.
>
> Simply throwing away user space work is a bug. And no, you cannot say that
> it'll be redone away, as you are throwing away accepted input, too.
when you are doing a suspend-to-disk I disagree with you. whoever is doing the
suspend knows what is going on, and they can decide what needs to be done.
the only case where you have 'unexpected' work being thrown away is if you are
suspending a network server, and the process of suspending it is going to cut
all the network connections anyway so it's not a seamless process. In this case
it's fair to let the sysadmin choose between loosing some logs or doing some
other step to prevent this from happening (which could be to shutdown the
network service, or load a iptables rule to block the service)
however, most of the uses of suspend-to-disk are going to be single-user
machines and in that case telling the user that anything that they do after
issuing the suspend is going to be lost is a perfectly sane thing to do.
and for that matter, if the snapshot is cheap enough, some people may choose to
cron the snapshot portion of a suspend-to-disk evvery few min as a safety net
for something going wrong. In this case they really do want all of userspace to
keep working after the snapshot.
David Lang
next prev parent reply other threads:[~2007-04-28 19:05 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-26 6:04 Back to the future Nigel Cunningham
2007-04-26 7:28 ` Pekka Enberg
[not found] ` <1177573348.50 25.224.camel@nigel.suspend2.net>
2007-04-26 7:42 ` Nigel Cunningham
2007-04-26 8:17 ` Pekka Enberg
2007-04-26 9:28 ` Nigel Cunningham
2007-04-26 17:29 ` Luca Tettamanti
2007-04-26 16:56 ` Linus Torvalds
2007-04-26 17:03 ` Xavier Bestel
2007-04-26 17:34 ` Linus Torvalds
2007-04-26 20:08 ` Nigel Cunningham
2007-04-26 20:45 ` Linus Torvalds
2007-04-26 20:50 ` Nigel Cunningham
2007-04-27 0:10 ` Olivier Galibert
2007-04-27 10:21 ` Daniel Pittman
2007-04-27 23:19 ` Nigel Cunningham
2007-04-26 21:38 ` Theodore Tso
2007-04-27 10:10 ` Christoph Hellwig
2007-04-26 22:08 ` Rafael J. Wysocki
2007-04-26 22:20 ` Nigel Cunningham
2007-04-26 23:15 ` Linus Torvalds
2007-04-27 7:51 ` Pekka Enberg
2007-04-26 17:07 ` Linus Torvalds
2007-04-26 18:22 ` Chase Venters
2007-04-26 18:50 ` David Lang
2007-04-26 19:56 ` Nigel Cunningham
2007-04-27 4:52 ` Pekka J Enberg
2007-04-27 6:08 ` Nigel Cunningham
2007-04-27 6:18 ` Pekka J Enberg
2007-04-27 6:29 ` Pekka J Enberg
2007-04-27 6:34 ` Nigel Cunningham
2007-04-27 6:50 ` Pekka J Enberg
2007-04-27 7:03 ` Nigel Cunningham
2007-04-27 7:24 ` Pekka J Enberg
2007-04-27 9:50 ` Oliver Neukum
2007-04-27 10:12 ` Pekka J Enberg
2007-04-27 19:07 ` Oliver Neukum
2007-04-28 9:22 ` Pekka Enberg
2007-04-28 13:37 ` Oliver Neukum
2007-05-03 12:06 ` Pavel Machek
2007-05-04 21:52 ` Indan Zupancic
2007-05-05 9:16 ` Pavel Machek
2007-05-05 12:02 ` Indan Zupancic
2007-04-28 10:35 ` Rafael J. Wysocki
2007-04-28 18:43 ` David Lang
2007-04-28 19:37 ` Rafael J. Wysocki
2007-04-27 21:24 ` Rafael J. Wysocki
2007-04-27 21:44 ` Linus Torvalds
2007-04-27 22:04 ` Rafael J. Wysocki
2007-04-27 22:08 ` Linus Torvalds
2007-04-27 22:41 ` Rafael J. Wysocki
2007-04-27 22:26 ` David Lang
2007-04-27 23:21 ` Rafael J. Wysocki
2007-04-27 23:01 ` David Lang
2007-04-28 0:02 ` Rafael J. Wysocki
2007-04-27 23:17 ` Linus Torvalds
2007-04-27 23:45 ` Rafael J. Wysocki
2007-04-27 23:57 ` Nigel Cunningham
2007-04-27 23:50 ` David Lang
2007-04-28 0:40 ` Linus Torvalds
2007-04-28 6:58 ` Oliver Neukum
2007-04-28 9:16 ` Pekka J Enberg
2007-04-28 18:28 ` David Lang [this message]
2007-05-03 17:18 ` Pavel Machek
2007-05-07 2:13 ` David Lang
2007-05-07 3:33 ` Kyle Moffett
2007-05-07 12:48 ` Pavel Machek
2007-05-07 12:52 ` Oliver Neukum
2007-05-07 14:37 ` david
2007-05-07 19:51 ` Pavel Machek
2007-05-07 19:55 ` david
2007-05-07 20:38 ` Pavel Machek
2007-05-08 17:36 ` Disconnect
2007-04-27 23:59 ` Linus Torvalds
2007-04-28 0:18 ` Linus Torvalds
2007-05-05 11:42 ` Pavel Machek
2007-04-28 0:50 ` Paul Mackerras
2007-04-28 1:00 ` Rafael J. Wysocki
2007-04-28 1:12 ` Linus Torvalds
2007-04-28 0:54 ` David Lang
2007-04-28 1:44 ` Rafael J. Wysocki
2007-04-28 2:51 ` Daniel Hazelton
2007-04-28 7:00 ` progress meter in s2disk (was Re: Back to the future.) Pavel Machek
2007-04-28 8:50 ` Back to the future Pavel Machek
2007-04-28 9:24 ` Rafael J. Wysocki
2007-04-28 16:28 ` Linus Torvalds
2007-04-28 17:50 ` Rafael J. Wysocki
2007-04-28 21:25 ` Linus Torvalds
2007-04-28 23:03 ` Rafael J. Wysocki
2007-04-28 23:45 ` Linus Torvalds
2007-04-29 0:01 ` Nigel Cunningham
2007-04-29 5:01 ` Bojan Smojver
2007-04-29 3:43 ` Kyle Moffett
2007-04-29 8:57 ` Rafael J. Wysocki
2007-04-29 8:59 ` Pavel Machek
2007-04-29 9:32 ` Rafael J. Wysocki
2007-04-29 8:23 ` Pavel Machek
2007-04-29 9:22 ` Rafael J. Wysocki
2007-04-28 18:32 ` David Lang
2007-04-28 19:14 ` Rafael J. Wysocki
2007-04-28 18:44 ` David Lang
2007-05-03 15:25 ` Pavel Machek
2007-04-27 22:07 ` Nigel Cunningham
2007-04-28 1:03 ` Kyle Moffett
2007-04-28 1:15 ` Rafael J. Wysocki
2007-04-28 0:51 ` David Lang
2007-04-28 1:25 ` Kyle Moffett
2007-05-03 15:10 ` Pavel Machek
2007-05-03 16:53 ` Kyle Moffett
2007-05-04 7:52 ` David Greaves
2007-05-04 13:27 ` Kyle Moffett
2007-04-28 0:18 ` Jeremy Fitzhardinge
2007-04-28 1:00 ` Matthew Garrett
2007-04-28 1:05 ` Jeremy Fitzhardinge
2007-05-03 15:14 ` Pavel Machek
2007-06-01 19:00 ` Eric W. Biederman
2007-04-28 1:08 ` Rafael J. Wysocki
2007-04-27 20:44 ` Rafael J. Wysocki
2007-04-28 19:09 ` Bill Davidsen
2007-04-26 22:40 ` Pavel Machek
2007-04-27 5:41 ` Pekka Enberg
2007-04-27 14:55 ` Pavel Machek
2007-04-27 21:39 ` Nigel Cunningham
2007-04-26 22:42 ` Pavel Machek
2007-04-26 22:24 ` David Lang
2007-04-26 23:12 ` Pavel Machek
2007-04-26 22:49 ` David Lang
2007-04-26 23:27 ` Pavel Machek
2007-04-26 22:56 ` David Lang
2007-04-27 0:23 ` Olivier Galibert
2007-04-27 12:49 ` Pavel Machek
2007-04-27 21:26 ` Rafael J. Wysocki
2007-04-27 22:12 ` David Lang
2007-04-26 8:38 ` Jan Engelhardt
2007-04-26 9:33 ` Nigel Cunningham
2007-04-28 0:28 ` Bojan Smojver
[not found] <8e5l8-7SD-21@gated-at.bofh.it>
[not found] ` <8e6Ka-1uR-3@gated-at.bofh.it>
[not found] ` <8e6TS-1Id-11@gated-at.bofh.it>
[not found] ` <8efu9-6mF-1@gated-at.bofh.it>
[not found] ` <8ekWV-6FF-33@gated-at.bofh.it>
[not found] ` <8el6y-6Sj-5@gated-at.bofh.it>
[not found] ` <8elpT-7wY-21@gated-at.bofh.it>
2007-04-28 11:04 ` Bodo Eggert
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