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From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
rjw@sisk.pl, linux-kernel@vger.kernel.org,
ncunningham@crca.org.au, linux-pm@lists.linux-foundation.org
Subject: Re: [linux-pm] Freezer: Don't count threads waiting for frozen filesystems.
Date: Wed, 29 Oct 2008 23:56:00 +0000 [thread overview]
Message-ID: <20081029235600.GA5993@srcf.ucam.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0810291627040.3986-100000@iolanthe.rowland.org>
On Wed, Oct 29, 2008 at 04:37:30PM -0400, Alan Stern wrote:
> I discussed this last summer with Rafael. It's a lot harder than it
> looks, for all sorts of reasons. For example, what about user tasks
> that have access to memory-mapped I/O regions?
The only interesting cases of this I know of are X (which ought to stop
doing so in the near future) and certain sound operations (which are
going via a well-defined API anyway and need to handle devices going
away at random, so not a problem). There may be some other niche cases,
but really - if you're mmapping hardware then it's generally because you
haven't written a proper kernel driver. Do that instead. Runtime power
management's already going to make you wildly unhappy.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2008-10-29 23:56 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1224886068.6478.21.camel@nigel-laptop>
2008-10-26 20:01 ` Rafael J. Wysocki
2008-10-27 11:12 ` Miklos Szeredi
2008-10-27 11:20 ` Nigel Cunningham
2008-10-27 11:37 ` Rafael J. Wysocki
2008-10-27 11:40 ` Nigel Cunningham
2008-10-27 12:38 ` Miklos Szeredi
2008-10-27 20:59 ` Nigel Cunningham
2008-10-27 21:09 ` Miklos Szeredi
2008-10-27 22:13 ` Nigel Cunningham
2008-10-28 20:25 ` Miklos Szeredi
2008-10-28 21:29 ` Nigel Cunningham
2008-10-28 21:51 ` Miklos Szeredi
2008-10-28 22:00 ` Rafael J. Wysocki
2008-10-28 22:02 ` Miklos Szeredi
2008-10-28 22:21 ` Rafael J. Wysocki
2008-10-28 23:21 ` Miklos Szeredi
2008-10-28 23:59 ` Rafael J. Wysocki
2008-10-29 8:10 ` Miklos Szeredi
2008-10-29 13:51 ` Alan Stern
2008-10-29 14:50 ` Miklos Szeredi
2008-10-29 15:28 ` Alan Stern
2008-10-29 15:50 ` Miklos Szeredi
2008-10-29 16:17 ` Alan Stern
2008-10-29 16:10 ` Miklos Szeredi
2008-10-29 20:37 ` Alan Stern
2008-10-29 21:11 ` Rafael J. Wysocki
2008-10-29 21:45 ` Nigel Cunningham
2008-10-29 22:07 ` Rafael J. Wysocki
2008-10-29 23:53 ` Miklos Szeredi
2008-11-09 13:44 ` Pavel Machek
2008-10-29 23:48 ` Miklos Szeredi
2008-10-30 13:04 ` Nigel Cunningham
2008-10-30 13:56 ` Alan Stern
2008-10-30 21:44 ` Nigel Cunningham
2008-10-31 8:49 ` Miklos Szeredi
2008-10-31 9:10 ` Nigel Cunningham
2008-10-31 9:16 ` Miklos Szeredi
2008-10-31 11:28 ` Nigel Cunningham
2008-10-31 12:44 ` Miklos Szeredi
2008-10-31 21:11 ` Nigel Cunningham
2008-10-29 23:43 ` Miklos Szeredi
2008-10-30 13:54 ` Alan Stern
2008-10-30 14:39 ` Miklos Szeredi
2008-10-30 17:07 ` Alan Stern
2008-10-30 17:43 ` Miklos Szeredi
2008-10-30 20:17 ` Rafael J. Wysocki
2008-11-15 16:58 ` Pavel Machek
2008-10-29 23:56 ` Matthew Garrett [this message]
2008-10-28 22:03 ` Nigel Cunningham
2008-10-28 23:04 ` Nigel Cunningham
2008-10-28 23:12 ` Miklos Szeredi
2008-10-28 23:17 ` Nigel Cunningham
2008-10-28 23:24 ` Miklos Szeredi
2008-10-28 23:41 ` Nigel Cunningham
2008-10-28 23:45 ` Miklos Szeredi
2008-10-28 23:50 ` Miklos Szeredi
2008-10-28 23:58 ` Nigel Cunningham
2008-10-28 23:54 ` Nigel Cunningham
2008-10-27 11:37 ` Miklos Szeredi
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