From: Pavel Machek <pavel@ucw.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Kyle Moffett <kyle@moffetthome.net>,
Uli Luckas <u.luckas@road.de>,
LKML <linux-kernel@vger.kernel.org>,
Nigel Cunningham <nigel@nigel.suspend2.net>,
Brian Swetland <swetland@google.com>,
pm list <linux-pm@lists.linux-foundation.org>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [RFD] Automatic suspend
Date: Fri, 27 Feb 2009 11:09:41 +0100 [thread overview]
Message-ID: <20090227100941.GE4582@elf.ucw.cz> (raw)
In-Reply-To: <200902210057.27781.rjw@sisk.pl>
Hi!
> > > Then, the decision making logic will be able to use /sys/power/sleep whenever
> > > it wishes to and the kernel will be able to refuse to suspend if it's not
> > > desirable at the moment.
> > >
> > > It seems to be flexible enough to me.
> >
> > This seems flexible enough to avoid race conditions, but it forces the
> > user space power manager to poll when the kernel refuse suspend.
>
> And if the kernel is supposed to start automatic suspend, it has to monitor
> all of the wakelocks. IMO, it's better to allow the power manager to poll the
> kernel if it refuses to suspend.
polling is evil -- it keeps CPU wake up => wastes power.
Wakelocks done right are single atomic_t... and if you set it to 0,
you just unblock "sleeper" thread or something. Zero polling and very
simple...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-02-27 10:09 UTC|newest]
Thread overview: 199+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200902191356.53584.rjw@sisk.pl>
2009-02-19 14:59 ` [RFD] Automatic suspend Alan Stern
[not found] ` <Pine.LNX.4.44L0.0902190956570.3012-100000@iolanthe.rowland.org>
2009-02-19 21:15 ` Rafael J. Wysocki
[not found] ` <200902192215.18365.rjw@sisk.pl>
2009-02-19 21:56 ` Brian Swetland
2009-02-19 22:08 ` Alan Stern
2009-02-19 22:08 ` Alan Stern
2009-02-19 22:08 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0902191659020.7953-100000@iolanthe.rowland.org>
2009-02-19 22:21 ` Rafael J. Wysocki
2009-02-19 22:21 ` Rafael J. Wysocki
2009-02-19 22:21 ` Rafael J. Wysocki
[not found] ` <200902192321.47891.rjw@sisk.pl>
2009-02-19 22:58 ` Oliver Neukum
[not found] ` <200902192358.13068.oliver@neukum.org>
2009-02-20 10:46 ` Rafael J. Wysocki
[not found] ` <200902201146.59944.rjw@sisk.pl>
2009-02-20 22:05 ` Oliver Neukum
[not found] ` <200902202305.09992.oliver@neukum.org>
2009-02-20 22:44 ` Rafael J. Wysocki
2009-02-20 23:11 ` Arve Hjønnevåg
2009-02-20 23:20 ` Oliver Neukum
[not found] ` <200902210020.47665.oliver@neukum.org>
2009-02-21 1:59 ` Arve Hjønnevåg
2009-02-20 2:39 ` Arve Hjønnevåg
[not found] ` <d6200be20902191839w1f74a962h30e859c8b2434f59@mail.gmail.com>
2009-02-20 10:49 ` Rafael J. Wysocki
2009-02-20 11:26 ` Arve Hjønnevåg
[not found] ` <d6200be20902200326g6caa211ai388d4aa9fc270a28@mail.gmail.com>
2009-02-20 15:56 ` Rafael J. Wysocki
[not found] ` <200902201657.01145.rjw@sisk.pl>
2009-02-20 16:07 ` Kyle Moffett
[not found] ` <f73f7ab80902200807j743a37d7hc42283bc7b9dbe6f@mail.gmail.com>
2009-02-20 20:56 ` Rafael J. Wysocki
[not found] ` <200902202156.13480.rjw@sisk.pl>
2009-02-20 21:02 ` Rafael J. Wysocki
2009-02-20 23:03 ` Arve Hjønnevåg
2009-02-20 23:12 ` Oliver Neukum
[not found] ` <200902210012.08088.oliver@neukum.org>
2009-02-20 23:40 ` Rafael J. Wysocki
[not found] ` <200902210040.50344.rjw@sisk.pl>
2009-02-20 23:45 ` Matthew Garrett
[not found] ` <20090220234548.GA9297@srcf.ucam.org>
2009-02-21 9:52 ` Rafael J. Wysocki
2009-02-21 16:52 ` Alan Stern
[not found] ` <d6200be20902201503m59a13cddn59adfc47d0c2ed1e@mail.gmail.com>
2009-02-20 23:57 ` Rafael J. Wysocki
[not found] ` <200902210057.27781.rjw@sisk.pl>
2009-02-21 1:08 ` Arve Hjønnevåg
[not found] ` <d6200be20902201708g45540f60ib024c3365c85aef4@mail.gmail.com>
2009-02-21 9:47 ` Rafael J. Wysocki
[not found] ` <200902211047.26787.rjw@sisk.pl>
2009-02-21 10:32 ` Arve Hjønnevåg
[not found] ` <d6200be20902210232m71700247k8914ca3735563881@mail.gmail.com>
2009-02-21 20:20 ` Rafael J. Wysocki
[not found] ` <200902212120.37684.rjw@sisk.pl>
2009-02-23 23:13 ` Arve Hjønnevåg
[not found] ` <d6200be20902231513h31661a95n63407b5194b56d51@mail.gmail.com>
2009-02-23 23:53 ` Rafael J. Wysocki
[not found] ` <200902240053.11164.rjw@sisk.pl>
2009-02-24 0:02 ` Arve Hjønnevåg
2009-02-27 10:12 ` Pavel Machek
2009-02-27 10:09 ` Pavel Machek [this message]
2009-02-27 14:22 ` Rafael J. Wysocki
[not found] ` <200902271522.41915.rjw@sisk.pl>
2009-02-27 14:29 ` Matthew Garrett
2009-02-27 20:40 ` Pavel Machek
[not found] ` <20090227142946.GA13650@srcf.ucam.org>
2009-02-27 20:54 ` Rafael J. Wysocki
[not found] ` <200902272154.03539.rjw@sisk.pl>
2009-02-27 22:09 ` Arve Hjønnevåg
[not found] ` <d6200be20902271409y395822c9ic8f1223f6551631c@mail.gmail.com>
2009-02-27 22:55 ` Rafael J. Wysocki
[not found] ` <20090227204053.GB1387@ucw.cz>
2009-02-27 20:55 ` Rafael J. Wysocki
[not found] ` <200902272155.42010.rjw@sisk.pl>
2009-02-27 22:56 ` Arve Hjønnevåg
[not found] ` <d6200be20902271456w77951afata1d5f378ddbe6b84@mail.gmail.com>
2009-02-27 23:44 ` Pavel Machek
[not found] ` <20090227234458.GB2089@elf.ucw.cz>
2009-02-28 3:04 ` Arve Hjønnevåg
2009-02-28 10:18 ` Rafael J. Wysocki
[not found] ` <200902281118.14595.rjw@sisk.pl>
2009-02-28 21:57 ` Arve Hjønnevåg
[not found] ` <d6200be20902281357r2d3a0075q77055c1781f174d7@mail.gmail.com>
2009-02-28 22:53 ` Rafael J. Wysocki
[not found] ` <200902282353.39763.rjw@sisk.pl>
2009-02-28 23:38 ` Arve Hjønnevåg
2009-03-01 0:06 ` Arve Hjønnevåg
[not found] ` <d6200be20902281606g1c5db332r9970931d7080717f@mail.gmail.com>
2009-03-01 6:28 ` Benjamin Herrenschmidt
2009-03-01 9:11 ` Rafael J. Wysocki
2009-03-01 9:20 ` Rafael J. Wysocki
2009-03-01 23:08 ` Pavel Machek
[not found] ` <200903011020.53130.rjw@sisk.pl>
2009-03-03 1:22 ` Arve Hjønnevåg
[not found] ` <d6200be20903021722y7f085482o66f6dee8c4004acd@mail.gmail.com>
2009-03-03 13:51 ` Pavel Machek
[not found] ` <20090303135143.GA5060@elf.ucw.cz>
2009-03-04 0:06 ` Arve Hjønnevåg
2009-03-04 0:47 ` Pavel Machek
[not found] ` <d6200be20902281538g1dd6aec4q1b42b610d3ea15d1@mail.gmail.com>
2009-03-01 23:17 ` Rafael J. Wysocki
[not found] ` <200903020017.52390.rjw@sisk.pl>
2009-03-02 23:48 ` Arve Hjønnevåg
[not found] ` <d6200be20903021548h11f57283t6d6a9053f3feb3fd@mail.gmail.com>
2009-03-03 22:39 ` Rafael J. Wysocki
[not found] ` <200903032339.02002.rjw@sisk.pl>
2009-03-03 23:38 ` Arve Hjønnevåg
[not found] ` <d6200be20903031538s42c8243dk59c505857cdab7cb@mail.gmail.com>
2009-03-04 0:49 ` Pavel Machek
2009-03-03 13:57 ` Pavel Machek
[not found] ` <20090303135750.GC5060@elf.ucw.cz>
2009-03-03 23:51 ` Arve Hjønnevåg
2009-02-22 14:03 ` Pavel Machek
[not found] ` <20090222140311.GF1387@ucw.cz>
2009-02-23 14:04 ` Oliver Neukum
[not found] ` <200902231504.27879.oliver@neukum.org>
2009-02-27 10:18 ` Pavel Machek
[not found] ` <20090227101818.GH4582@elf.ucw.cz>
2009-02-27 15:22 ` Oliver Neukum
2009-02-27 17:09 ` Chris Friesen
[not found] ` <49A81E59.6010105@nortel.com>
2009-02-27 20:46 ` Pavel Machek
[not found] ` <200902271622.25141.oliver@neukum.org>
2009-03-05 16:54 ` Pavel Machek
[not found] <Pine.LNX.4.44L0.0902270943490.2926-100000@iolanthe.rowland.org>
2009-02-27 20:58 ` Rafael J. Wysocki
[not found] <20090227101632.GG4582@elf.ucw.cz>
2009-02-27 14:46 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0902211135170.7396-100000@netrider.rowland.org>
2009-02-21 21:14 ` Rafael J. Wysocki
[not found] ` <200902212214.59660.rjw@sisk.pl>
2009-02-27 10:16 ` Pavel Machek
[not found] <200902190004.18878.rjw@sisk.pl>
2009-02-18 23:31 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0902181826500.23001-100000@iolanthe.rowland.org>
2009-02-19 12:56 ` Rafael J. Wysocki
2009-03-05 13:48 ` Pavel Machek
[not found] <Pine.LNX.4.44L0.0902181135400.3186-100000@iolanthe.rowland.org>
2009-02-18 17:10 ` Oliver Neukum
[not found] <Pine.LNX.4.44L0.0902181009410.3186-100000@iolanthe.rowland.org>
2009-02-18 15:55 ` Oliver Neukum
2009-02-18 16:39 ` Alan Stern
[not found] <200902181605.18363.oliver@neukum.org>
2009-02-18 15:10 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0902162144010.24097-100000@netrider.rowland.org>
2009-02-17 23:26 ` Rafael J. Wysocki
[not found] ` <200902180026.55533.rjw@sisk.pl>
2009-02-18 8:53 ` Oliver Neukum
[not found] ` <200902180953.51171.oliver@neukum.org>
2009-02-18 14:51 ` Arjan van de Ven
[not found] ` <20090218065158.5efa8536@infradead.org>
2009-02-18 15:05 ` Oliver Neukum
2009-02-18 15:09 ` Alan Stern
[not found] <Pine.LNX.4.44L0.0902162156380.24097-100000@netrider.rowland.org>
2009-02-17 23:21 ` Rafael J. Wysocki
[not found] ` <200902180022.00239.rjw@sisk.pl>
2009-02-18 4:46 ` Arve Hjønnevåg
[not found] ` <d6200be20902172046sf00599ckc6710c6132d6b92f@mail.gmail.com>
2009-02-18 21:17 ` Rafael J. Wysocki
[not found] ` <200902182217.48321.rjw@sisk.pl>
2009-02-18 22:35 ` Arve Hjønnevåg
2009-02-18 22:44 ` Oliver Neukum
2009-02-18 23:04 ` Rafael J. Wysocki
2009-03-01 22:56 ` Pavel Machek
[not found] ` <20090301225647.GE1961@elf.ucw.cz>
2009-03-02 8:24 ` Oliver Neukum
[not found] ` <200903020924.42451.oliver@neukum.org>
2009-03-02 14:34 ` Pavel Machek
2009-03-02 15:13 ` Arjan van de Ven
[not found] <20090216185758.1a4d041d@infradead.org>
2009-02-17 3:26 ` Alan Stern
[not found] <200902170008.31054.rjw@sisk.pl>
2009-02-17 3:09 ` Alan Stern
[not found] <200902170002.37973.rjw@sisk.pl>
2009-02-17 2:56 ` Alan Stern
[not found] <200902162312.50556.rjw@sisk.pl>
2009-02-16 22:40 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0902161736210.21117-100000@netrider.rowland.org>
2009-02-16 22:56 ` Arjan van de Ven
2009-02-16 23:02 ` Rafael J. Wysocki
[not found] ` <20090216145655.727cd39c@infradead.org>
2009-02-16 23:28 ` Rafael J. Wysocki
2009-02-17 2:43 ` Alan Stern
2009-02-17 2:57 ` Arjan van de Ven
2009-02-15 23:10 Rafael J. Wysocki
2009-02-16 0:44 ` Arjan van de Ven
[not found] ` <20090215164456.34aef7e8@infradead.org>
2009-02-16 2:12 ` Benjamin Herrenschmidt
[not found] ` <1234750360.26036.115.camel@pasglop>
2009-02-16 2:20 ` Arjan van de Ven
[not found] ` <20090215182012.3bc6b292@infradead.org>
2009-02-16 3:23 ` Benjamin Herrenschmidt
2009-02-16 7:06 ` Oliver Neukum
[not found] ` <200902160806.17901.oliver@neukum.org>
2009-02-16 15:40 ` Arjan van de Ven
[not found] ` <20090216074048.6d70f17c@infradead.org>
2009-02-16 16:48 ` Oliver Neukum
[not found] ` <200902161748.09208.oliver@neukum.org>
2009-02-16 17:31 ` Arjan van de Ven
[not found] ` <20090216093108.078aac35@infradead.org>
2009-02-16 20:08 ` Kyle Moffett
[not found] ` <f73f7ab80902161208h12837d4ex1d28d55d031d5d71@mail.gmail.com>
2009-02-16 20:28 ` Arjan van de Ven
2009-02-16 20:39 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0902161537080.19732-100000@netrider.rowland.org>
2009-02-16 20:45 ` Arjan van de Ven
[not found] ` <20090216124520.315320dc@infradead.org>
2009-02-16 21:32 ` Woodruff, Richard
[not found] ` <13B9B4C6EF24D648824FF11BE896716203771DCF1E@dlee02.ent.ti.com>
2009-02-16 21:52 ` Arjan van de Ven
[not found] ` <20090216135204.064f553b@infradead.org>
2009-02-16 22:36 ` Woodruff, Richard
[not found] ` <13B9B4C6EF24D648824FF11BE896716203771DD01B@dlee02.ent.ti.com>
2009-02-16 22:59 ` Arjan van de Ven
2009-02-16 23:08 ` Rafael J. Wysocki
[not found] ` <20090216145948.6fea81c3@infradead.org>
2009-02-16 23:19 ` Rafael J. Wysocki
[not found] ` <200902170019.40599.rjw@sisk.pl>
2009-02-16 23:23 ` Matthew Garrett
2009-02-16 23:41 ` Arjan van de Ven
[not found] ` <20090216232329.GA15678@srcf.ucam.org>
2009-02-17 10:12 ` Oliver Neukum
2009-02-17 13:58 ` Mark Brown
2009-02-17 14:20 ` Brian Swetland
2009-02-18 0:45 ` mark gross
2009-02-20 5:35 ` Arve Hjønnevåg
[not found] ` <d6200be20902192135y166eb90bt895c97c7b381c44c@mail.gmail.com>
2009-02-20 15:27 ` Arjan van de Ven
2009-02-20 18:22 ` Pavel Machek
[not found] ` <20090220182213.GA1681@ucw.cz>
2009-02-20 18:26 ` Matthew Garrett
[not found] ` <20090220182609.GA3289@srcf.ucam.org>
2009-02-20 20:49 ` Rafael J. Wysocki
[not found] ` <200902202149.25990.rjw@sisk.pl>
2009-02-20 22:43 ` Arve Hjønnevåg
[not found] ` <20090217142001.GB12378@bulgaria.corp.google.com>
2009-02-17 14:24 ` Matthew Garrett
2009-02-17 14:46 ` Arjan van de Ven
[not found] ` <20090217142453.GA25530@srcf.ucam.org>
2009-02-17 14:56 ` Oliver Neukum
[not found] ` <20090217064630.688bf639@infradead.org>
2009-02-17 14:51 ` Matthew Garrett
[not found] ` <20090217145141.GA26158@srcf.ucam.org>
2009-02-17 14:56 ` Arjan van de Ven
2009-02-17 14:58 ` Igor Stoppa
[not found] ` <20090217065622.3e0a9956@infradead.org>
2009-02-17 15:32 ` Woodruff, Richard
[not found] ` <13B9B4C6EF24D648824FF11BE896716203771DD342@dlee02.ent.ti.com>
2009-02-18 0:04 ` Arjan van de Ven
[not found] ` <20090217160421.12bc851f@infradead.org>
2009-02-18 0:18 ` Woodruff, Richard
2009-02-18 0:52 ` mark gross
2009-02-18 5:11 ` Arve Hjønnevåg
[not found] ` <13B9B4C6EF24D648824FF11BE896716203772614AD@dlee02.ent.ti.com>
2009-02-18 5:35 ` Arjan van de Ven
[not found] ` <d6200be20902172111y16debabaq85b8f58520f4079a@mail.gmail.com>
2009-02-18 5:55 ` Arjan van de Ven
2009-02-18 15:15 ` Matthew Garrett
[not found] ` <20090218151529.GB15195@srcf.ucam.org>
2009-02-18 15:20 ` Woodruff, Richard
2009-02-17 15:28 ` Brian Swetland
[not found] ` <20090217152811.GA12686@bulgaria.corp.google.com>
2009-02-18 0:55 ` mark gross
2009-02-18 2:40 ` Benjamin Herrenschmidt
2009-02-18 17:48 ` Jesse Barnes
[not found] ` <200902180948.06039.jbarnes@virtuousgeek.org>
2009-02-18 17:52 ` Matthew Garrett
[not found] ` <20090218175244.GA19235@srcf.ucam.org>
2009-02-18 18:01 ` Jesse Barnes
2009-02-18 22:05 ` Benjamin Herrenschmidt
2009-03-01 22:51 ` Pavel Machek
2009-02-27 10:00 ` Pavel Machek
2009-02-16 23:20 ` Oliver Neukum
[not found] ` <200902170020.15509.oliver@neukum.org>
2009-02-20 18:05 ` Pavel Machek
[not found] ` <1234754621.26036.120.camel@pasglop>
2009-02-16 3:30 ` Arjan van de Ven
2009-02-16 23:05 ` Pavel Machek
2009-02-16 6:23 ` Roland Dreier
2009-02-16 7:02 ` Oliver Neukum
[not found] ` <adad4di7vef.fsf@cisco.com>
2009-02-16 15:38 ` Arjan van de Ven
2009-02-16 22:47 ` Pavel Machek
2009-02-16 21:48 ` Rafael J. Wysocki
[not found] ` <200902162248.34287.rjw@sisk.pl>
2009-02-16 21:52 ` Peter Zijlstra
2009-02-16 21:53 ` Arjan van de Ven
[not found] ` <20090216135339.53b4a911@infradead.org>
2009-02-16 22:12 ` Rafael J. Wysocki
2009-02-16 22:51 ` Pavel Machek
[not found] ` <20090216225116.GG1370@ucw.cz>
2009-02-16 22:55 ` Arjan van de Ven
2009-02-16 23:00 ` Rafael J. Wysocki
[not found] ` <200902170000.43387.rjw@sisk.pl>
2009-02-16 23:18 ` Pavel Machek
2009-02-16 23:29 ` Oliver Neukum
2009-02-16 22:58 ` Pavel Machek
[not found] ` <20090216225831.GH1370@ucw.cz>
2009-02-16 23:13 ` Matthew Garrett
[not found] ` <20090216231324.GA15435@srcf.ucam.org>
2009-02-16 23:22 ` Pavel Machek
[not found] ` <20090216232259.GK1370@ucw.cz>
2009-02-16 23:26 ` Matthew Garrett
2009-02-17 14:14 ` Brian Swetland
2009-02-17 14:19 ` Matthew Garrett
2009-02-17 21:57 ` mark gross
[not found] ` <20090217215717.GA25605@linux.intel.com>
2009-02-17 22:04 ` Matthew Garrett
[not found] ` <20090217220439.GA1573@srcf.ucam.org>
2009-02-17 22:19 ` Jesse Barnes
[not found] ` <200902171419.14823.jbarnes@virtuousgeek.org>
2009-02-17 23:28 ` Woodruff, Richard
2009-02-18 0:34 ` mark gross
2009-02-18 17:30 ` Chris Ball
2009-02-16 23:26 ` Rafael J. Wysocki
[not found] ` <200902170026.06966.rjw@sisk.pl>
2009-02-22 13:46 ` Pavel Machek
2009-02-18 0:27 ` mark gross
[not found] ` <20090218002704.GB25605@linux.intel.com>
2009-02-18 21:11 ` Rafael J. Wysocki
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