From: Andi Kleen <andi@firstfloor.org>
To: Pavel Machek <pavel@suse.cz>
Cc: Andi Kleen <andi@firstfloor.org>, Nick Piggin <npiggin@suse.de>,
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: Sat, 10 Jan 2009 16:07:29 +0100 [thread overview]
Message-ID: <20090110150729.GE26290@one.firstfloor.org> (raw)
In-Reply-To: <20090108132455.GE2247@ucw.cz>
On Thu, Jan 08, 2009 at 02:24:55PM +0100, Pavel Machek wrote:
> On Wed 2009-01-07 03:57:25, 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?
>
> And what do you propose? Silently corrupt data on the slow device?
Yes not writing is better than being unable to reboot.
There should be always a timeout at least for the reboot case.
Consider it from a uptime perspective: if something is really
screwed up (and that happens sometimes; classical example
was the IO stack getting hung up forever in error handling
loops) the only way to get running again is to reboot and try again.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2009-01-10 14:53 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
2009-01-08 13:24 ` Pavel Machek
2009-01-10 15:07 ` Andi Kleen [this message]
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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