From: Matthew Garrett <mjg@redhat.com>
To: Linus WALLEIJ <linus.walleij@stericsson.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
Oleg Nesterov <oleg@redhat.com>,
"linux-pm@lists.linux-foundation.org"
<linux-pm@lists.linux-foundation.org>,
Arjan van de Ven <arjan@infradead.org>,
Len Brown <len.brown@intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
Liam Girdwood <lrg@slimlogic.co.uk>,
Daniel Walker <dwalker@codeaurora.org>,
"tytso@mit.edu" <tytso@mit.edu>,
Geoff Smith <geoffx.smith@intel.com>,
Brian Swetland <swetland@google.com>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 0/8] Suspend block api (version 6)
Date: Mon, 17 May 2010 22:06:15 +0100 [thread overview]
Message-ID: <20100517210615.GB1873@srcf.ucam.org> (raw)
In-Reply-To: <CEE6BB42CAD6E947908279175AF8470A025A726242@EXDCVYMBSTM006.EQ1STM.local>
On Mon, May 17, 2010 at 10:53:36PM +0200, Linus WALLEIJ wrote:
> I understand the problem such that the scheduler cannot determine whether
> a certain process should be allowed to schedule or not.
>
> It strikes me that the intuitive solution is to group all un-trusted
> processes/threads/tasks that need to be shut off even if they are
> scheduling into a control group and let the idle code ignore the
> processes in this group.
>
> Or is there something too naïve about this?
It gets most of the way there (and I spent a while playing with it), but
the problem is that not all wakeup events get proxied through the
trusted userspace runtime. Network packets are the easiest example - a
packet may wake the system, but if the process it's delivered to is
frozen then obviously things get trickier. It's also racy, in that if
you're currently awake and receive a packet that would otherwise have
woken the system you may go to sleep between the packet being received
and bubbling up through the kernel to get to userspace.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-05-17 21:06 UTC|newest]
Thread overview: 188+ 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
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 [this message]
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
[not found] <Pine.LNX.4.44L0.1005031301400.1651-100000@iolanthe.rowland.org>
2010-05-14 17:22 ` Paul Walmsley
[not found] <Pine.LNX.4.44L0.1005040949060.1729-100000@iolanthe.rowland.org>
2010-05-14 20:53 ` Paul Walmsley
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