From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Sitsofe Wheeler <sitsofe@yahoo.com>
Cc: Theodore Tso <tytso@mit.edu>,
"Andreas T.Auer" <andreas.t.auer_lkml_73537@ursus.ath.cx>,
Alberto Gonzalez <info@gnebu.es>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Ext4 and the "30 second window of death"
Date: Wed, 1 Apr 2009 16:12:21 +0100 [thread overview]
Message-ID: <20090401151219.GA12285@srcf.ucam.org> (raw)
In-Reply-To: <20090401052050.GA20456@sucs.org>
On Wed, Apr 01, 2009 at 06:20:50AM +0100, Sitsofe Wheeler wrote:
> Just out of curiosity, when laptop mode is happening is there a
> guarantee that writes to other files won't be reordered to before the
> fsync?
laptop-mode does two things - tweak the dirty page semantics slightly
(not in an interestingly relevant way) and call sys_sync() a few seconds
after something hits disk rather than cache. In contrast to Ted's
suggestion that laptop-mode reduces data integrity, it actually enhances
it by opportunistically ensuring that data hits disk. It's the
lengthening of the commit intervals that usually accompanies it that
increases the risk of data loss.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2009-04-01 15:12 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-29 10:24 Ext4 and the "30 second window of death" Alberto Gonzalez
2009-03-31 12:25 ` Theodore Tso
2009-03-31 12:52 ` Alberto Gonzalez
2009-03-31 13:45 ` Theodore Tso
2009-03-31 14:45 ` Alberto Gonzalez
2009-04-01 0:04 ` Theodore Tso
2009-04-01 1:14 ` Alberto Gonzalez
2009-03-31 22:02 ` Alberto Gonzalez
2009-03-31 23:22 ` Andreas T.Auer
2009-04-01 1:25 ` Alberto Gonzalez
2009-04-01 1:50 ` Theodore Tso
2009-04-01 5:20 ` Sitsofe Wheeler
2009-04-01 15:12 ` Matthew Garrett [this message]
2009-04-01 17:35 ` Theodore Tso
2009-04-01 17:43 ` Matthew Garrett
2009-04-01 21:21 ` Ray Lee
2009-04-01 21:26 ` Matthew Garrett
2009-04-02 11:25 ` Sitsofe Wheeler
2009-04-02 18:22 ` david
2009-04-02 18:29 ` Matthew Garrett
2009-04-02 18:44 ` david
2009-04-02 20:07 ` Ray Lee
2009-04-02 20:59 ` Andreas T.Auer
2009-04-02 23:38 ` Theodore Tso
2009-04-03 0:00 ` Matthew Garrett
2009-04-03 7:33 ` Pavel Machek
2009-04-03 8:14 ` Andreas T.Auer
2009-04-02 22:36 ` Bron Gondwana
2009-04-02 23:46 ` Matthew Garrett
2009-04-03 0:55 ` david
2009-04-03 1:06 ` Matthew Garrett
2009-04-03 1:16 ` david
2009-04-03 1:19 ` Matthew Garrett
2009-04-03 1:24 ` david
2009-04-03 1:36 ` Matthew Garrett
2009-04-03 3:08 ` david
2009-04-03 13:42 ` Matthew Garrett
2009-04-03 4:54 ` Theodore Tso
2009-04-03 11:09 ` Sitsofe Wheeler
2009-04-03 13:07 ` Alberto Gonzalez
2009-04-03 13:45 ` Matthew Garrett
2009-04-02 18:34 ` Nick Piggin
2009-04-02 18:38 ` Matthew Garrett
2009-04-02 18:56 ` Nick Piggin
2009-04-02 23:47 ` Matthew Garrett
2009-04-03 0:59 ` david
2009-04-03 1:09 ` Matthew Garrett
2009-04-03 1:17 ` david
2009-04-03 1:22 ` Matthew Garrett
2009-04-03 2:22 ` Ric Wheeler
2009-04-02 21:47 ` david
2009-04-06 21:32 ` supporting laptops fs-semantic changes (was Re: Ext4 and the "30 second window of death") Linda Walsh
2009-04-02 11:37 ` Ext4 and the "30 second window of death" Sitsofe Wheeler
2009-04-01 8:51 ` Andreas T.Auer
2009-04-03 7:13 ` Bojan Smojver
2009-04-05 4:07 ` Bojan Smojver
2009-04-05 4:51 ` Bojan Smojver
2009-04-05 5:41 ` Bojan Smojver
2009-04-05 17:27 ` Ed Tomlinson
-- strict thread matches above, loose matches on Subject: below --
2009-04-05 18:13 Tomasz Chmielewski
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