From: Tony Lindgren <tony@atomide.com>
To: Matthew Garrett <mjg@redhat.com>
Cc: "Alan Stern" <stern@rowland.harvard.edu>,
"Paul Walmsley" <paul@pwsan.com>,
"Arve Hjønnevåg" <arve@android.com>,
"Linux-pm mailing list" <linux-pm@lists.linux-foundation.org>,
"Kernel development list" <linux-kernel@vger.kernel.org>,
"Tejun Heo" <tj@kernel.org>, "Oleg Nesterov" <oleg@redhat.com>,
"Kevin Hilman" <khilman@deeprootsystems.com>,
magnus.damm@gmail.com, "Theodore Ts'o" <tytso@mit.edu>,
"mark gross" <mgross@linux.intel.com>,
"Arjan van de Ven" <arjan@infradead.org>,
"Geoff Smith" <geoffx.smith@intel.com>,
"Brian Swetland" <swetland@google.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
"Benoît Cousson" <b-cousson@ti.com>,
linux-omap@vger.kernel.org, "Vitaly Wool" <vitalywool@gmail.com>,
"Mark Brown" <broonie@opensource.wolfsonmicro.com>,
"Liam Girdwood" <lrg@slimlogic.co.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)
Date: Thu, 13 May 2010 14:10:06 -0700 [thread overview]
Message-ID: <20100513211006.GG3428@atomide.com> (raw)
In-Reply-To: <20100513203412.GA21244@srcf.ucam.org>
* Matthew Garrett <mjg@redhat.com> [100513 13:29]:
> On Thu, May 13, 2010 at 01:23:20PM -0700, Tony Lindgren wrote:
> > * Matthew Garrett <mjg@redhat.com> [100513 13:03]:
> > > On Thu, May 13, 2010 at 01:00:04PM -0700, Tony Lindgren wrote:
> > >
> > > > The system stays running because there's something to do. The system
> > > > won't suspend until all the processors hit the kernel idle loop and
> > > > the next_timer_interrupt_critical() returns nothing.
> > >
> > > At which point an application in a busy loop cripples you.
> >
> > Maybe you could deal with the misbehaving untrusted apps in the userspace
> > by sending kill -STOP to them when the screen blanks? Then continue
> > when some event wakes up the system again.
>
> And if that's the application that's listening to the network socket
> that you want to get a wakeup event from? This problem is hard. I'd love
> there to be an elegant solution based on using the scheduler, but I
> really don't know what it is.
Your system should wake up to an interrupt in that case. Then you have
the trusted apps running that can decide if the untrusted apps should
be continued or not.
The key would be to have the basic apps behave and use the critical
timers as needed. The advantage is that then you can do all the
policy in the userspace and in a custom pm_idle function.
Regards,
Tony
next prev parent reply other threads:[~2010-05-13 21:10 UTC|newest]
Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1272667021-21312-1-git-send-email-arve@android.com>
2010-05-13 3:35 ` [linux-pm] [PATCH 0/8] Suspend block api (version 6) Paul Walmsley
2010-05-13 12:17 ` Matthew Garrett
2010-05-13 17:33 ` Daniel Walker
2010-05-13 18:17 ` Brian Swetland
2010-05-13 18:25 ` Daniel Walker
2010-05-13 18:36 ` [linux-pm] " Matthew Garrett
2010-05-13 18:59 ` Daniel Walker
2010-05-13 19:11 ` Matthew Garrett
2010-05-13 19:36 ` Daniel Walker
2010-05-13 19:48 ` Matthew Garrett
2010-05-13 21:11 ` Rafael J. Wysocki
2010-05-13 21:16 ` Daniel Walker
2010-05-13 21:27 ` Rafael J. Wysocki
2010-05-13 21:33 ` Daniel Walker
2010-05-13 21:36 ` Tony Lindgren
2010-05-13 21:54 ` Rafael J. Wysocki
2010-05-13 21:46 ` Greg KH
2010-05-13 22:27 ` Mark Brown
2010-05-13 22:45 ` Greg KH
2010-05-14 0:03 ` Mark Brown
2010-05-13 22:46 ` Rafael J. Wysocki
2010-05-13 23:36 ` Mark Brown
2010-05-13 23:48 ` [linux-pm] " Brian Swetland
2010-05-14 0:29 ` Mark Brown
2010-05-13 22:33 ` Woodruff, Richard
2010-05-13 22:46 ` Greg KH
2010-05-13 23:06 ` [linux-pm] " Arve Hjønnevåg
2010-05-13 23:28 ` Brian Swetland
2010-05-14 16:47 ` Daniel Walker
2010-05-13 14:16 ` Alan Stern
2010-05-13 19:17 ` Tony Lindgren
2010-05-13 19:25 ` Matthew Garrett
2010-05-13 19:42 ` Tony Lindgren
2010-05-13 19:53 ` Matthew Garrett
2010-05-13 20:00 ` Tony Lindgren
2010-05-13 20:08 ` Matthew Garrett
2010-05-13 20:23 ` Tony Lindgren
2010-05-13 20:34 ` Matthew Garrett
2010-05-13 21:10 ` Tony Lindgren [this message]
2010-05-13 21:21 ` Matthew Garrett
2010-05-13 21:34 ` Tony Lindgren
2010-05-15 19:54 ` Matthew Garrett
2010-05-13 21:21 ` Rafael J. Wysocki
2010-05-13 21:25 ` Tony Lindgren
2010-05-13 21:56 ` Rafael J. Wysocki
2010-05-14 20:41 ` Kevin Hilman
2010-05-14 21:25 ` Rafael J. Wysocki
2010-05-14 21:40 ` Kevin Hilman
2010-05-14 21:50 ` Rafael J. Wysocki
2010-05-14 22:45 ` [linux-pm] " Kevin Hilman
2010-05-14 22:59 ` Brian Swetland
2010-05-15 2:58 ` Alan Stern
2010-05-15 3:40 ` Brian Swetland
2010-05-15 21:19 ` Alan Stern
2010-05-17 15:40 ` Kevin Hilman
2010-05-17 17:04 ` James Bottomley
2010-05-17 17:47 ` Felipe Balbi
2010-05-17 17:58 ` Matthew Garrett
2010-05-17 18:16 ` Felipe Balbi
2010-05-17 17:59 ` James Bottomley
2010-05-17 18:12 ` Felipe Balbi
2010-05-17 18:26 ` Brian Swetland
2010-05-17 18:39 ` Felipe Balbi
2010-05-17 18:45 ` Brian Swetland
2010-05-17 20:22 ` Rafael J. Wysocki
2010-05-17 18:45 ` Mark Brown
2010-05-17 18:47 ` Mike Chan
2010-05-17 19:24 ` James Bottomley
2010-05-17 19:38 ` Felipe Balbi
2010-05-17 19:39 ` Felipe Balbi
2010-05-17 19:49 ` James Bottomley
2010-05-18 6:40 ` Felipe Balbi
2010-05-18 13:59 ` James Bottomley
2010-05-19 6:59 ` Felipe Balbi
2010-05-19 20:42 ` Rafael J. Wysocki
2010-05-20 4:49 ` Felipe Balbi
2010-05-20 11:27 ` Vladimir Pantelic
2010-05-20 11:29 ` Felipe Balbi
2010-05-20 17:40 ` David Brownell
2010-05-20 18:50 ` Felipe Balbi
2010-05-20 23:08 ` David Brownell
2010-05-20 5:15 ` Florian Mickler
2010-05-20 8:57 ` Felipe Balbi
2010-05-20 8:57 ` Felipe Balbi
2010-05-20 10:05 ` [linux-pm] " Florian Mickler
2010-05-20 10:15 ` Felipe Balbi
2010-05-17 18:54 ` Kevin Hilman
2010-05-17 17:57 ` Daniel Walker
2010-05-15 20:14 ` Rafael J. Wysocki
2010-05-16 19:44 ` Mark Brown
2010-05-13 22:24 ` tytso
2010-05-13 20:36 ` Daniel Walker
2010-05-14 16:06 ` Kevin Hilman
2010-05-24 21:25 ` Pavel Machek
2010-05-13 21:41 ` Alan Stern
2010-05-13 21:54 ` Tony Lindgren
2010-05-13 22:07 ` Rafael J. Wysocki
2010-05-13 22:26 ` Arve Hjønnevåg
2010-05-13 21:14 ` Rafael J. Wysocki
2010-05-13 21:31 ` Tony Lindgren
2010-05-13 21:57 ` Rafael J. Wysocki
2010-05-13 21:37 ` Alan Stern
2010-05-13 21:47 ` Tony Lindgren
2010-05-13 22:01 ` Alan Stern
2010-05-13 22:08 ` Tony Lindgren
2010-05-13 22:28 ` Rafael J. Wysocki
2010-05-15 2:35 ` Alan Stern
2010-05-15 4:04 ` Arve Hjønnevåg
2010-05-13 22:04 ` [linux-pm] " Rafael J. Wysocki
2010-05-14 3:25 ` Magnus Damm
2010-05-14 16:18 ` Kevin Hilman
2010-05-15 2:47 ` Alan Stern
2010-05-24 21:24 ` Pavel Machek
[not found] ` <1272667021-21312-2-git-send-email-arve@android.com>
2010-05-13 19:01 ` [PATCH 1/8] PM: Add suspend block api Paul Walmsley
2010-05-14 20:05 ` Paul Walmsley
[not found] ` <87wrvl5479.fsf@deeprootsystems.com>
[not found] ` <20100503180741.GB2098@rakim.wolfsonmicro.main>
2010-05-14 17:39 ` [PATCH 0/8] Suspend block api (version 6) Paul Walmsley
[not found] ` <201005032318.35383.rjw@sisk.pl>
2010-05-14 20:02 ` Paul Walmsley
[not found] ` <87sk68r1zh.fsf@deeprootsystems.com>
[not found] ` <s2qd6200be21005031709r28420f0ezf3cf286517ee9114@mail.gmail.com>
2010-05-14 20:27 ` Paul Walmsley
2010-05-14 22:18 ` Arve Hjønnevåg
2010-05-15 2:25 ` Alan Stern
2010-05-15 4:02 ` Arve Hjønnevåg
2010-05-15 21:25 ` Alan Stern
2010-05-17 4:54 ` Arve Hjønnevåg
2010-05-18 2:26 ` Paul Walmsley
2010-05-18 3:21 ` Arve Hjønnevåg
2010-05-18 7:03 ` Henrik Rydberg
2010-05-18 19:39 ` Rafael J. Wysocki
2010-05-25 9:41 ` Paul Walmsley
2010-05-25 23:08 ` Arve Hjønnevåg
2010-05-26 7:23 ` Linus WALLEIJ
2010-05-26 16:01 ` Alan Stern
2010-05-27 7:46 ` Linus WALLEIJ
2010-05-27 8:04 ` Florian Mickler
2010-05-27 8:40 ` Arve Hjønnevåg
2010-05-27 15:33 ` Alan Stern
2010-05-28 11:54 ` Linus WALLEIJ
2010-05-20 23:37 ` David Brownell
2010-05-25 16:51 ` Dmitry Torokhov
2010-05-25 18:25 ` Alan Stern
2010-05-25 18:33 ` Dmitry Torokhov
2010-05-25 22:05 ` Arve Hjønnevåg
2010-05-25 22:28 ` Dmitry Torokhov
[not found] ` <20100504004338.GA22678@srcf.ucam.org>
2010-05-14 20:36 ` Paul Walmsley
[not found] ` <20100503215028.GB18910@srcf.ucam.org>
2010-05-14 20:20 ` Paul Walmsley
2010-05-14 20:32 ` Matthew Garrett
2010-05-14 22:32 ` Kevin Hilman
2010-05-14 22:37 ` Arve Hjønnevåg
2010-05-15 19:47 ` Rafael J. Wysocki
2010-05-15 19:55 ` Brian Swetland
2010-05-15 23:51 ` Rafael J. Wysocki
2010-05-16 0:31 ` Brian Swetland
2010-05-14 23:15 ` tytso
2010-05-15 19:52 ` Rafael J. Wysocki
2010-05-16 19:01 ` Mark Brown
2010-05-18 1:39 ` Paul Walmsley
2010-05-18 1:55 ` Matthew Garrett
2010-05-19 16:17 ` Paul Walmsley
2010-05-19 16:25 ` Matthew Garrett
2010-05-21 16:51 ` Paul Walmsley
2010-05-21 17:01 ` Paul Walmsley
2010-05-21 17:09 ` Matthew Garrett
2010-05-17 16:12 ` Kevin Hilman
2010-05-17 19:27 ` Vitaly Wool
2010-05-17 19:34 ` Matthew Garrett
2010-05-17 19:50 ` Daniel Walker
2010-05-17 20:00 ` Matthew Garrett
2010-05-17 20:02 ` Brian Swetland
2010-05-17 20:53 ` Linus WALLEIJ
2010-05-17 21:06 ` Matthew Garrett
2010-05-17 21:16 ` Linus WALLEIJ
2010-05-17 21:24 ` Matthew Garrett
2010-05-17 21:29 ` Daniel Walker
2010-05-17 21:35 ` Matthew Garrett
2010-05-17 21:39 ` Daniel Walker
2010-05-17 21:27 ` Kevin Hilman
2010-05-17 21:34 ` Matthew Garrett
2010-05-17 22:56 ` Kevin Hilman
2010-05-17 21:36 ` Brian Swetland
2010-05-18 2:40 ` tytso
2010-05-17 20:07 ` [linux-pm] " Mike Chan
2010-05-17 20:17 ` Vitaly Wool
2010-05-17 21:04 ` Mike Chan
2010-05-17 22:55 ` Kevin Hilman
2010-05-17 23:04 ` Brian Swetland
2010-05-17 20:15 ` Rafael J. Wysocki
2010-05-30 12:21 ` tytso
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