From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Paul Mackerras <paulus@samba.org>
Cc: mjg59@srcf.ucam.org, linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Miklos Szeredi <miklos@szeredi.hu>
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway
Date: Thu, 5 Jul 2007 14:29:06 +0200 [thread overview]
Message-ID: <200707051429.07535.rjw@sisk.pl> (raw)
In-Reply-To: <18060.15209.274437.471074@cargo.ozlabs.ibm.com>
On Thursday, 5 July 2007 02:29, Paul Mackerras wrote:
> Rafael J. Wysocki writes:
>
> > They will not trigger 100% of the time, but sporadically and generally at
> > random.
> >
> > At least the freezer problems are reproducible. ;-)
>
> Our experience with powermacs has been that it isn't actually all that
> hard to get it right for the drivers you care about.
Well, I'm a bit suspicious about that. ;-)
Namely, if you run your suspend code on one CPU and (do I remeber correctly
that?) with kernel preemption disabled, then you practically prevent user land
processes from being scheduled when your suspend code is running.
If that is the case (of which I'm not sure), the freezer is obviously
unnecessary, because you've taken processes out of the equation in a different
way ...
Greetings,
Rafael
--
"Premature optimization is the root of all evil." - Donald Knuth
next prev parent reply other threads:[~2007-07-05 12:29 UTC|newest]
Thread overview: 187+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070703211227.GA28758@srcf.ucam.org>
2007-07-03 21:16 ` [PATCH] Remove process freezer from suspend to RAM pathway Alan Stern
[not found] ` <Pine.LNX.4.44L0.0707031713530.8010-100000@iolanthe.rowland.org>
2007-07-03 21:20 ` Matthew Garrett
2007-07-03 21:37 ` Rafael J. Wysocki
2007-07-03 22:21 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0707031814440.8010-100000@iolanthe.rowland.org>
2007-07-03 22:42 ` Matthew Garrett
[not found] ` <200707032337.52544.rjw@sisk.pl>
2007-07-03 21:36 ` Matthew Garrett
[not found] ` <20070703213639.GA29149@srcf.ucam.org>
2007-07-03 21:47 ` Oliver Neukum
2007-07-03 22:46 ` Rafael J. Wysocki
2007-07-04 3:38 ` Paul Mackerras
[not found] ` <18059.5690.908102.273897@cargo.ozlabs.ibm.com>
2007-07-04 10:42 ` Rafael J. Wysocki
2007-07-04 10:58 ` Paul Mackerras
2007-07-04 11:25 ` Rafael J. Wysocki
[not found] ` <200707041325.55779.rjw@sisk.pl>
2007-07-04 11:34 ` Paul Mackerras
2007-07-04 11:51 ` Miklos Szeredi
2007-07-04 12:41 ` Theodore Tso
[not found] ` <20070704124133.GA5836@thunk.org>
2007-07-04 14:40 ` Rafael J. Wysocki
[not found] ` <E1I63Nv-0006Z9-00@dorka.pomaz.szeredi.hu>
2007-07-04 14:41 ` Rafael J. Wysocki
2007-07-04 14:45 ` Miklos Szeredi
2007-07-04 15:03 ` Oliver Neukum
[not found] ` <200707041703.21808.oliver@neukum.org>
2007-07-04 15:17 ` Rafael J. Wysocki
[not found] ` <200707041717.05149.rjw@sisk.pl>
2007-07-05 0:29 ` Paul Mackerras
[not found] ` <18060.15209.274437.471074@cargo.ozlabs.ibm.com>
2007-07-05 12:29 ` Rafael J. Wysocki [this message]
2007-07-12 15:13 ` Pavel Machek
2007-07-04 15:42 ` Alan Stern
2007-07-04 19:25 ` Miklos Szeredi
[not found] ` <E1I6ATN-0007QS-00@dorka.pomaz.szeredi.hu>
2007-07-04 21:36 ` Rafael J. Wysocki
2007-07-05 8:37 ` Miklos Szeredi
[not found] ` <E1I6Mq2-0008WB-00@dorka.pomaz.szeredi.hu>
2007-07-05 12:39 ` Rafael J. Wysocki
[not found] ` <200707051439.37737.rjw@sisk.pl>
2007-07-05 12:39 ` Miklos Szeredi
2007-07-05 16:10 ` Jeremy Fitzhardinge
[not found] ` <468D17FA.8040201@goop.org>
2007-07-05 17:45 ` Miklos Szeredi
2007-07-05 0:43 ` Paul Mackerras
[not found] ` <18060.16064.519060.755991@cargo.ozlabs.ibm.com>
2007-07-05 12:49 ` Rafael J. Wysocki
2007-07-05 0:36 ` Paul Mackerras
[not found] ` <18060.15630.812698.367707@cargo.ozlabs.ibm.com>
[not found] ` <200707051451.38497.rjw@sisk.pl>
2007-07-05 12:50 ` Johannes Berg
[not found] ` <1183639825.3818.38.camel@johannes.berg>
2007-07-05 13:47 ` Rafael J. Wysocki
2007-07-05 12:51 ` Rafael J. Wysocki
2007-07-05 14:25 ` Alan Stern
[not found] ` <18059.34264.421573.246262@cargo.ozlabs.ibm.com>
2007-07-04 14:12 ` Dmitry Torokhov
2007-07-04 15:38 ` Alan Stern
2007-07-04 19:07 ` Alan Stern
[not found] <200707082046.36864.rjw@sisk.pl>
2007-07-08 20:22 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0707081619090.11049-100000@netrider.rowland.org>
2007-07-08 21:08 ` Pavel Machek
2007-07-08 21:21 ` Benjamin Herrenschmidt
[not found] ` <1183929708.3388.306.camel@localhost.localdomain>
2007-07-09 6:52 ` Oliver Neukum
[not found] ` <200707090852.03429.oliver@neukum.org>
2007-07-09 9:14 ` Benjamin Herrenschmidt
2007-07-09 11:56 ` Rafael J. Wysocki
[not found] <1183871941.3388.286.camel@localhost.localdomain>
2007-07-08 20:17 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0707072218030.10912-100000@netrider.rowland.org>
2007-07-08 4:39 ` Benjamin Herrenschmidt
2007-07-08 18:46 ` Rafael J. Wysocki
2007-07-08 18:26 ` Rafael J. Wysocki
[not found] <Pine.LNX.4.44L0.0707072224270.10912-100000@netrider.rowland.org>
2007-07-08 5:14 ` Benjamin Herrenschmidt
[not found] ` <1183871661.3388.282.camel@localhost.localdomain>
2007-07-08 5:19 ` Benjamin Herrenschmidt
2007-07-08 19:15 ` Rafael J. Wysocki
2007-07-08 20:16 ` Alan Stern
2007-07-08 20:55 ` Pavel Machek
[not found] ` <Pine.LNX.4.44L0.0707081517540.11049-100000@netrider.rowland.org>
2007-07-08 21:01 ` Pavel Machek
2007-07-08 21:20 ` Benjamin Herrenschmidt
2007-07-08 21:35 ` Rafael J. Wysocki
[not found] ` <1183929611.3388.303.camel@localhost.localdomain>
2007-07-08 22:06 ` Rafael J. Wysocki
[not found] ` <200707090006.32712.rjw@sisk.pl>
2007-07-09 0:33 ` Benjamin Herrenschmidt
2007-07-09 0:57 ` Kyle Moffett
[not found] ` <FFA29D56-3400-4EA3-8CE8-C1EF75484510@mac.com>
2007-07-09 1:32 ` Benjamin Herrenschmidt
2007-07-09 6:47 ` Oliver Neukum
[not found] ` <200707090847.43378.oliver@neukum.org>
2007-07-09 9:13 ` Benjamin Herrenschmidt
2007-07-09 9:23 ` Oliver Neukum
[not found] ` <200707091123.57400.oliver@neukum.org>
2007-07-09 9:33 ` Benjamin Herrenschmidt
2007-07-09 14:57 ` Adrian Bunk
2007-07-09 10:02 ` Pavel Machek
2007-07-09 10:05 ` Benjamin Herrenschmidt
2007-07-09 16:03 ` Alan Stern
[not found] ` <200707082115.27363.rjw@sisk.pl>
2007-07-08 21:03 ` Benjamin Herrenschmidt
2007-07-08 21:07 ` Pavel Machek
2007-07-08 21:45 ` Rafael J. Wysocki
[not found] ` <200707082345.27859.rjw@sisk.pl>
2007-07-08 21:54 ` Benjamin Herrenschmidt
[not found] <1183855732.3388.240.camel@localhost.localdomain>
2007-07-08 2:53 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0707071255590.26860-100000@netrider.rowland.org>
2007-07-08 0:48 ` Benjamin Herrenschmidt
[not found] <1183781219.3388.225.camel@localhost.localdomain>
2007-07-07 17:19 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0707062210470.7605-100000@netrider.rowland.org>
2007-07-07 4:06 ` Benjamin Herrenschmidt
[not found] <Pine.LNX.4.44L0.0707061034540.3737-100000@iolanthe.rowland.org>
2007-07-07 3:44 ` Benjamin Herrenschmidt
2007-07-07 11:49 ` Pavel Machek
2007-07-08 0:40 ` Benjamin Herrenschmidt
2007-07-07 16:17 ` Alan Stern
2007-07-08 0:42 ` Benjamin Herrenschmidt
[not found] ` <1183855362.3388.233.camel@localhost.localdomain>
2007-07-08 2:24 ` Alan Stern
2007-07-08 18:20 ` Rafael J. Wysocki
[not found] <EAA83A3B-1534-458B-A6F8-D090D670D4E7@mac.com>
2007-07-07 2:59 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0707061114190.3737-100000@iolanthe.rowland.org>
2007-07-07 0:43 ` Kyle Moffett
[not found] <Pine.LNX.4.44L0.0707051023520.3728-100000@iolanthe.rowland.org>
2007-07-05 17:42 ` Miklos Szeredi
2007-07-05 20:43 ` Alan Stern
[not found] <20070703042916.GA17240@srcf.ucam.org>
2007-07-03 4:54 ` Nigel Cunningham
[not found] ` <200707031454.42078.nigel@nigel.suspend2.net>
2007-07-03 5:21 ` Matthew Garrett
[not found] ` <20070703052130.GA17605@srcf.ucam.org>
2007-07-03 5:24 ` Nigel Cunningham
2007-07-03 5:48 ` Benjamin Herrenschmidt
[not found] ` <1183441706.10386.73.camel@localhost.localdomain>
2007-07-03 6:08 ` Nigel Cunningham
[not found] ` <200707031608.06348.nigel@nigel.suspend2.net>
2007-07-03 7:19 ` Benjamin Herrenschmidt
[not found] ` <1183447184.10386.102.camel@localhost.localdomain>
2007-07-03 12:56 ` Rafael J. Wysocki
[not found] ` <200707031456.40890.rjw@sisk.pl>
2007-07-03 21:14 ` Benjamin Herrenschmidt
[not found] ` <1183497290.3388.4.camel@localhost.localdomain>
2007-07-03 21:32 ` Rafael J. Wysocki
[not found] ` <200707032332.49694.rjw@sisk.pl>
2007-07-03 21:35 ` Benjamin Herrenschmidt
[not found] ` <1183498555.3388.14.camel@localhost.localdomain>
2007-07-03 22:43 ` Rafael J. Wysocki
2007-07-05 9:30 ` Pavel Machek
[not found] ` <20070705093013.GA3228@elf.ucw.cz>
2007-07-05 22:46 ` Benjamin Herrenschmidt
[not found] ` <1183675615.3388.81.camel@localhost.localdomain>
2007-07-05 23:13 ` Nigel Cunningham
[not found] ` <200707060913.05644.nigel@nigel.suspend2.net>
2007-07-05 23:20 ` Benjamin Herrenschmidt
[not found] ` <1183677643.3388.105.camel@localhost.localdomain>
2007-07-05 23:35 ` Nigel Cunningham
[not found] ` <200707060935.12706.nigel@nigel.suspend2.net>
2007-07-06 1:19 ` Kyle Moffett
2007-07-06 3:54 ` Benjamin Herrenschmidt
[not found] ` <1183694055.3388.108.camel@localhost.localdomain>
2007-07-06 4:03 ` Nigel Cunningham
[not found] ` <200707061403.15932.nigel@nigel.suspend2.net>
2007-07-06 4:41 ` Benjamin Herrenschmidt
2007-07-06 5:25 ` Nigel Cunningham
2007-07-06 5:01 ` Kyle Moffett
[not found] ` <CF605B91-2425-4FC2-9434-5F8877EEEEEB@mac.com>
2007-07-06 5:53 ` Nigel Cunningham
2007-07-10 2:07 ` Nigel Cunningham
[not found] ` <200707101207.16711.nigel@nigel.suspend2.net>
2007-07-10 3:03 ` Kyle Moffett
[not found] ` <CF60EC03-0171-4052-924D-57555A393168@mac.com>
2007-07-06 1:37 ` Nigel Cunningham
2007-07-06 3:59 ` Benjamin Herrenschmidt
[not found] ` <1183694347.3388.114.camel@localhost.localdomain>
2007-07-06 7:35 ` Rafael J. Wysocki
2007-07-06 9:03 ` Benjamin Herrenschmidt
2007-07-06 14:38 ` Alan Stern
2007-07-06 15:42 ` Alan Stern
2007-07-05 0:03 ` Pavel Machek
2007-07-03 5:49 ` Benjamin Herrenschmidt
2007-07-03 5:51 ` Benjamin Herrenschmidt
2007-07-03 6:13 ` Oliver Neukum
2007-07-03 7:37 ` Romano Giannetti
[not found] ` <1183448224.12649.14.camel@localhost>
2007-07-03 8:20 ` Oliver Neukum
2007-07-03 13:12 ` Rafael J. Wysocki
[not found] ` <200707030813.53481.oliver@neukum.org>
2007-07-03 6:51 ` Miklos Szeredi
2007-07-03 12:13 ` Matthew Garrett
[not found] ` <20070703121313.GA21318@srcf.ucam.org>
2007-07-03 13:09 ` Rafael J. Wysocki
2007-07-03 12:56 ` Rafael J. Wysocki
[not found] ` <1183441748.10386.75.camel@localhost.localdomain>
2007-07-03 13:07 ` Rafael J. Wysocki
[not found] ` <1183441887.10386.77.camel@localhost.localdomain>
2007-07-03 13:08 ` Rafael J. Wysocki
[not found] ` <200707031508.45595.rjw@sisk.pl>
2007-07-03 15:09 ` Rafael J. Wysocki
[not found] ` <200707031709.29968.rjw@sisk.pl>
2007-07-03 17:20 ` Oliver Neukum
2007-07-03 20:59 ` Rafael J. Wysocki
2007-07-03 21:35 ` Benjamin Herrenschmidt
[not found] ` <1183498518.3388.12.camel@localhost.localdomain>
2007-07-03 22:33 ` Rafael J. Wysocki
2007-07-04 23:39 ` Pavel Machek
[not found] ` <20070704233909.GB2719@elf.ucw.cz>
2007-07-05 6:53 ` Oliver Neukum
2007-07-03 18:26 ` Oliver Neukum
2007-07-03 19:13 ` Miklos Szeredi
2007-07-03 19:32 ` Oliver Neukum
2007-07-03 19:47 ` Miklos Szeredi
2007-07-03 21:20 ` Benjamin Herrenschmidt
2007-07-03 21:48 ` Oliver Neukum
[not found] ` <200707032348.42796.oliver@neukum.org>
2007-07-03 21:56 ` Benjamin Herrenschmidt
[not found] ` <1183499792.3388.16.camel@localhost.localdomain>
2007-07-03 22:04 ` Oliver Neukum
[not found] ` <200707040004.16357.oliver@neukum.org>
2007-07-03 23:08 ` Benjamin Herrenschmidt
[not found] ` <1183504112.3388.45.camel@localhost.localdomain>
2007-07-04 8:10 ` Oliver Neukum
2007-07-04 23:45 ` Pavel Machek
[not found] ` <20070704234523.GC2719@elf.ucw.cz>
2007-07-05 12:25 ` Rafael J. Wysocki
[not found] ` <200707051425.07904.rjw@sisk.pl>
2007-07-05 12:38 ` Nigel Cunningham
[not found] ` <200707052238.27889.nigel@nigel.suspend2.net>
2007-07-05 13:35 ` Rafael J. Wysocki
[not found] ` <200707051535.46196.rjw@sisk.pl>
2007-07-05 13:36 ` Nigel Cunningham
[not found] ` <200707052336.27585.nigel@nigel.suspend2.net>
2007-07-05 13:59 ` Rafael J. Wysocki
[not found] ` <200707051559.58479.rjw@sisk.pl>
2007-07-05 21:49 ` Nigel Cunningham
[not found] ` <200707060749.08665.nigel@nigel.suspend2.net>
[not found] ` <200707060940.23248.rjw@sisk.pl>
2007-07-06 7:39 ` Miklos Szeredi
[not found] ` <E1I6iPL-0003Hj-00@dorka.pomaz.szeredi.hu>
2007-07-06 7:51 ` Oliver Neukum
2007-07-06 9:09 ` Miklos Szeredi
2007-07-06 9:16 ` Nigel Cunningham
2007-07-06 9:33 ` Miklos Szeredi
2007-07-06 7:40 ` Rafael J. Wysocki
2007-07-03 21:09 ` Rafael J. Wysocki
2007-07-03 19:27 ` Pavel Machek
[not found] ` <20070703192729.GA2125@elf.ucw.cz>
2007-07-03 21:25 ` Rafael J. Wysocki
2007-07-03 21:16 ` Benjamin Herrenschmidt
2007-07-03 16:03 ` Alan Stern
2007-07-03 16:05 ` Matthew Garrett
2007-07-03 16:57 ` Alan Stern
2007-07-03 17:02 ` Matthew Garrett
2007-07-03 19:33 ` Alan Stern
2007-07-03 19:42 ` Matthew Garrett
2007-07-03 19:54 ` Alan Stern
2007-07-03 20:23 ` Matthew Garrett
2007-07-04 23:33 ` Pavel Machek
[not found] <20070703224215.GA30081@srcf.ucam.org>
2007-07-04 14:38 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0707041030540.25704-100000@netrider.rowland.org>
2007-07-04 14:58 ` Matthew Garrett
[not found] ` <20070704145818.GA7784@srcf.ucam.org>
2007-07-04 15:02 ` Oliver Neukum
2007-07-04 15:57 ` Alan Stern
[not found] <fa.ftLWBLCc+XqdYjiuxoPg+qyuUOE@ifi.uio.no>
[not found] ` <fa.Oxrm8HYXTOF4jv5LrTjEe16lCE0@ifi.uio.no>
[not found] ` <fa.d3GOse+YbAb42uYwLymWkJiH9Fw@ifi.uio.no>
2007-07-04 0:17 ` Robert Hancock
[not found] ` <468AE700.7080102@shaw.ca>
2007-07-04 0:34 ` Matthew Garrett
[not found] ` <20070704003424.GA30958@srcf.ucam.org>
2007-07-04 10:21 ` Rafael J. Wysocki
[not found] <20070703202329.GA27927@srcf.ucam.org>
2007-07-03 21:10 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0707031708080.8010-100000@iolanthe.rowland.org>
2007-07-03 21:12 ` Matthew Garrett
2007-07-03 4:29 Matthew Garrett
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