From: Pavel Machek <pavel@ucw.cz>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Jens Axboe <jens.axboe@oracle.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Maxim Levitsky <maximlevitsky@gmail.com>,
linux-pm <linux-pm@lists.linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen?
Date: Mon, 1 Mar 2010 07:35:08 +0100 [thread overview]
Message-ID: <20100301063508.GA1455@ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1002231016500.1507-100000@iolanthe.rowland.org>
Hi!
> > > This is a matter for Jens. Is the bdi writeback task freezable? If it
> > > is, should it be made unfreezable?
> >
> > I'm not a big expect on what tasks should be freezable or not. As it
> > stands, the writeback tasks will attempt to freeze and thaw with the
> > system. I guess that screws the sync from resume call, since it's not
> > running and the sync will wait for it to retrieve and finish that work
> > item.
> >
> > To the suspend experts - can we safely mark the writeback tasks as
> > non-freezable?
>
> The reason for freezing those tasks is to avoid writebacks at random
> times during a system sleep transition, when the underlying device may
> already be suspended, right?
It is also there to avoid inconsistency between in-filesystem data and
snapshot in hibernation image.
--
(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:[~2010-03-01 6:35 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-13 13:29 Is it supposed to be ok to call del_gendisk while userspace is frozen? Maxim Levitsky
2010-02-13 13:29 ` Maxim Levitsky
2010-02-15 16:00 ` Maxim Levitsky
2010-02-15 16:00 ` Maxim Levitsky
2010-02-15 21:04 ` Rafael J. Wysocki
2010-02-15 21:04 ` Rafael J. Wysocki
2010-02-16 16:27 ` [linux-pm] " Alan Stern
2010-02-20 22:22 ` Maxim Levitsky
2010-02-20 22:22 ` [linux-pm] " Maxim Levitsky
2010-02-23 12:33 ` Jens Axboe
2010-02-23 12:33 ` [linux-pm] " Jens Axboe
2010-02-23 15:29 ` Alan Stern
2010-02-23 15:29 ` [linux-pm] " Alan Stern
2010-02-23 15:58 ` Jens Axboe
2010-02-23 15:58 ` [linux-pm] " Jens Axboe
2010-02-23 16:33 ` Alan Stern
2010-02-23 16:33 ` [linux-pm] " Alan Stern
2010-02-23 22:16 ` Jens Axboe
2010-02-23 22:16 ` [linux-pm] " Jens Axboe
2010-02-24 15:59 ` Alan Stern
2010-02-24 19:12 ` Jens Axboe
2010-02-24 19:12 ` [linux-pm] " Jens Axboe
2010-02-24 20:19 ` Alan Stern
2010-02-24 20:19 ` [linux-pm] " Alan Stern
2010-02-24 15:59 ` Alan Stern
2010-02-23 16:42 ` Testing for dirty buffers on a block device Alan Stern
2010-02-23 22:13 ` Jens Axboe
2010-02-23 22:13 ` Jens Axboe
2010-02-24 15:51 ` Alan Stern
2010-02-24 19:09 ` Jens Axboe
2010-02-24 20:09 ` Alan Stern
2010-02-25 8:20 ` Jens Axboe
2010-02-25 8:20 ` Jens Axboe
2010-02-25 22:19 ` Dave Chinner
2010-02-25 22:19 ` Dave Chinner
2010-02-24 20:09 ` Alan Stern
2010-02-24 19:09 ` Jens Axboe
2010-02-24 15:51 ` Alan Stern
2010-02-23 16:42 ` Alan Stern
2010-03-01 6:35 ` Pavel Machek [this message]
2010-03-01 15:23 ` Is it supposed to be ok to call del_gendisk while userspace is frozen? Alan Stern
2010-03-01 15:23 ` [linux-pm] " Alan Stern
2010-03-03 21:50 ` Pavel Machek
2010-03-03 22:23 ` Alan Stern
2010-03-04 0:23 ` Rafael J. Wysocki
2010-03-04 2:48 ` Alan Stern
2010-03-04 19:26 ` Rafael J. Wysocki
2010-03-04 19:26 ` [linux-pm] " Rafael J. Wysocki
2010-03-04 19:36 ` Alan Stern
2010-03-04 19:36 ` [linux-pm] " Alan Stern
2010-03-04 20:04 ` Rafael J. Wysocki
2010-03-04 20:04 ` [linux-pm] " Rafael J. Wysocki
2010-03-04 20:15 ` Pavel Machek
2010-03-04 20:15 ` [linux-pm] " Pavel Machek
2010-04-22 23:40 ` Matt Reimer
2010-04-23 5:17 ` Rafael J. Wysocki
2010-05-11 23:55 ` Matt Reimer
2010-05-11 23:55 ` [linux-pm] " Matt Reimer
2010-05-12 14:50 ` Alan Stern
2010-05-12 14:50 ` [linux-pm] " Alan Stern
2010-05-13 21:44 ` Matt Reimer
2010-05-13 21:54 ` Alan Stern
2010-05-13 22:20 ` Matt Reimer
2010-05-13 22:47 ` Nigel Cunningham
2010-05-13 22:47 ` [linux-pm] " Nigel Cunningham
2010-05-15 2:37 ` Alan Stern
2010-05-15 2:53 ` Nigel Cunningham
2010-05-15 2:53 ` [linux-pm] " Nigel Cunningham
2010-05-16 19:35 ` Rafael J. Wysocki
2010-05-16 19:35 ` Rafael J. Wysocki
2010-05-15 2:37 ` Alan Stern
2010-05-15 2:32 ` Alan Stern
2010-05-15 2:32 ` [linux-pm] " Alan Stern
2010-05-15 20:30 ` Rafael J. Wysocki
2010-05-15 20:30 ` [linux-pm] " Rafael J. Wysocki
2010-05-16 7:49 ` Nigel Cunningham
2010-05-16 19:38 ` Rafael J. Wysocki
2010-05-16 21:32 ` Nigel Cunningham
2010-05-16 21:32 ` [linux-pm] " Nigel Cunningham
2010-05-17 2:22 ` Alan Stern
2010-05-17 2:22 ` [linux-pm] " Alan Stern
2010-05-17 7:45 ` Nigel Cunningham
2010-05-17 7:45 ` [linux-pm] " Nigel Cunningham
2010-05-17 20:35 ` Rafael J. Wysocki
2010-05-17 20:35 ` [linux-pm] " Rafael J. Wysocki
2010-05-17 22:51 ` Nigel Cunningham
2010-05-18 19:43 ` Rafael J. Wysocki
2010-05-18 20:06 ` Alan Stern
2010-05-18 20:06 ` [linux-pm] " Alan Stern
2010-05-18 19:43 ` Rafael J. Wysocki
2010-05-24 19:02 ` [linux-pm] " Pavel Machek
2010-05-24 21:21 ` Nigel Cunningham
2010-05-24 21:21 ` Nigel Cunningham
2010-05-24 19:02 ` Pavel Machek
2010-05-17 22:51 ` Nigel Cunningham
2010-05-16 19:38 ` Rafael J. Wysocki
2010-05-16 7:49 ` Nigel Cunningham
2010-05-13 22:20 ` Matt Reimer
2010-05-13 21:54 ` Alan Stern
2010-05-13 21:44 ` Matt Reimer
2010-04-23 5:17 ` Rafael J. Wysocki
2010-04-22 23:40 ` Matt Reimer
2010-03-04 2:48 ` Alan Stern
2010-03-04 0:23 ` Rafael J. Wysocki
2010-03-04 13:53 ` Pavel Machek
2010-03-04 13:53 ` [linux-pm] " Pavel Machek
2010-06-04 11:20 ` Maxim Levitsky
2010-06-04 11:20 ` [linux-pm] " Maxim Levitsky
2010-06-04 14:59 ` Alan Stern
2010-06-04 15:19 ` Maxim Levitsky
2010-06-04 15:19 ` [linux-pm] " Maxim Levitsky
2010-06-04 17:52 ` Alan Stern
2010-06-04 17:52 ` [linux-pm] " Alan Stern
2010-06-04 14:59 ` Alan Stern
2010-03-03 22:23 ` Alan Stern
2010-03-03 21:50 ` Pavel Machek
2010-03-01 6:35 ` Pavel Machek
2010-02-16 16:27 ` Alan Stern
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