From: Nick Piggin <npiggin@suse.de>
To: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.29 -mm merge plans
Date: Wed, 7 Jan 2009 04:28:03 +0100 [thread overview]
Message-ID: <20090107032802.GA22559@wotan.suse.de> (raw)
In-Reply-To: <20090107025725.GJ496@one.firstfloor.org>
On Wed, Jan 07, 2009 at 03:57:25AM +0100, Andi Kleen wrote:
> > sys_sync B which is invoked *after* sys_sync caller A should not
> > return before A. If you didn't have a global lock, they'd tend to
> > block one another's pages anyway. I think it's OK.
>
> It means that you cannot reboot because reboot does sync.
> What happens when the sync gets stuck somewhere on a really
> slow device?
I don't follow you.
The sync gets "stuck" because it is writing out dirty data. You
don't want to reboot before that happens, which is exactly the
reason why sync gets called (although it is probably not needed
anyway if all filesystems get unmounted).
next prev parent reply other threads:[~2009-01-07 3:28 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-05 8:43 2.6.29 -mm merge plans Andrew Morton
2009-01-05 9:00 ` KOSAKI Motohiro
2009-01-05 9:07 ` Andrew Morton
2009-01-05 22:31 ` Ying Han
2009-01-05 22:34 ` Valdis.Kletnieks
2009-01-08 4:18 ` Ying Han
2009-01-08 4:41 ` KOSAKI Motohiro
2009-01-08 7:57 ` Ying Han
2009-01-08 8:31 ` KOSAKI Motohiro
2009-01-11 4:18 ` Valdis.Kletnieks
2009-01-12 4:18 ` Ying Han
2009-01-06 5:27 ` Valdis.Kletnieks
2009-01-06 5:41 ` Nick Piggin
2009-01-05 9:02 ` Sam Ravnborg
2009-01-05 9:12 ` Andrew Morton
2009-01-05 9:17 ` David Miller
2009-01-05 9:21 ` Ingo Molnar
2009-01-05 9:39 ` Sam Ravnborg
2009-01-05 10:10 ` Ingo Molnar
2009-01-05 10:36 ` David Miller
2009-01-05 12:32 ` Ingo Molnar
2009-01-05 10:11 ` Ingo Molnar
2009-01-05 10:37 ` David Miller
2009-01-05 9:40 ` Ryusuke Konishi
2009-01-06 13:30 ` Pekka Enberg
2009-01-07 3:26 ` Ryusuke Konishi
2009-01-07 7:58 ` Pekka Enberg
2009-01-07 14:17 ` Chris Mason
2009-01-05 11:34 ` Al Viro
2009-01-05 11:40 ` Stephen Rothwell
2008-10-06 6:14 ` Greg Ungerer
2009-01-05 12:17 ` Ingo Molnar
2009-01-05 17:38 ` KOSAKI Motohiro
2009-01-05 12:28 ` Nick Piggin
2009-01-12 22:06 ` Andrew Morton
2009-01-15 6:37 ` Nick Piggin
2009-01-06 9:46 ` Pavel Machek
2009-01-06 22:33 ` Folkert van Heusden
2009-01-06 22:38 ` Alan Cox
2009-01-06 22:57 ` Christoph Hellwig
2009-01-06 23:08 ` Andrew Morton
2009-01-07 1:05 ` Nick Piggin
2009-01-06 23:08 ` Andrew Morton
2009-01-06 23:22 ` Christoph Hellwig
2009-01-07 2:16 ` Dave Chinner
2009-01-08 15:50 ` Dmitri Monakhov
2009-01-06 23:11 ` Andrew Morton
2009-01-06 23:24 ` Christoph Hellwig
2009-01-07 1:14 ` Nick Piggin
2009-01-07 1:38 ` Andi Kleen
2009-01-07 1:49 ` Nick Piggin
2009-01-07 2:57 ` Andi Kleen
2009-01-07 3:28 ` Nick Piggin [this message]
2009-01-08 13:24 ` Pavel Machek
2009-01-10 15:07 ` Andi Kleen
2009-01-10 21:32 ` sync, reboot, and corrupting data [was Re: 2.6.29 -mm merge plans] Pavel Machek
2009-01-10 22:12 ` Andi Kleen
2009-01-10 22:26 ` Pavel Machek
2009-01-08 13:22 ` 2.6.29 -mm merge plans Pavel Machek
2009-01-06 23:13 ` Andrew Morton
2009-01-06 23:24 ` Christoph Hellwig
2009-01-06 23:38 ` Andrew Morton
2009-01-07 2:06 ` Nick Piggin
2009-01-07 2:16 ` Andrew Morton
2009-01-07 3:05 ` Nick Piggin
2009-01-07 4:16 ` Andrew Morton
2009-01-06 23:15 ` Andrew Morton
2009-01-06 23:25 ` Christoph Hellwig
2009-01-07 7:54 ` Christoph Hellwig
2009-01-07 7:59 ` Andrew Morton
2009-01-07 8:10 ` Christoph Hellwig
2009-01-06 23:17 ` Andrew Morton
2009-01-06 23:19 ` Christoph Hellwig
2009-01-06 23:26 ` Warren Turkal
2009-01-06 23:26 ` Warren Turkal
2009-01-12 3:19 ` Roman Zippel
2009-01-06 23:27 ` Diego E. 'Flameeyes' Pettenò
2009-01-06 23:31 ` Christoph Hellwig
2009-01-06 23:49 ` Harvey Harrison
2009-01-07 0:09 ` Diego E. 'Flameeyes' Pettenò
2009-01-07 0:16 ` Harvey Harrison
2009-01-12 4:21 ` Roman Zippel
2009-01-06 23:19 ` Andrew Morton
2009-01-08 19:11 ` Rodolfo Giometti
2009-01-12 20:23 ` Christoph Hellwig
2009-01-13 9:49 ` Rodolfo Giometti
2009-01-12 20:22 ` Christoph Hellwig
2009-01-13 9:47 ` Rodolfo Giometti
2009-01-06 23:21 ` Andrew Morton
2009-01-06 23:28 ` Andrew Morton
2009-01-07 2:21 ` Nick Piggin
2009-01-08 8:39 ` Miklos Szeredi
2009-01-15 6:45 ` Nick Piggin
2009-01-07 0:01 ` Dan Williams
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