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From: Oliver Neukum <oneukum@suse.de>
To: Dave Chinner <david@fromorbit.com>
Cc: "D. Jansen" <d.g.jansen@googlemail.com>,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	tytso@mit.edu
Subject: Re: [rfc] Ignore Fsync Calls in Laptop_Mode
Date: Wed, 25 May 2011 08:50:11 +0200	[thread overview]
Message-ID: <201105250850.12179.oneukum@suse.de> (raw)
In-Reply-To: <20110525000003.GJ32466@dastard>

Am Mittwoch, 25. Mai 2011, 02:00:03 schrieb Dave Chinner:
> Oh, you're talking about application level write ordering. IO
> "ordering" in filesystem speak is about guaranteeing the order of
> data vs metadata writes for ensuring consistency after a crash
> (e.g. ext3/4 default "data=ordered" mode). that's what I was
> refering to, not anythign to do with applications.
> 
> Besides, having to work out how to handle subtle application write
> ordering bugs because you changed fsync semantics is simply another
> reason for not changing behaviour in the first place.

Sure. I'd say changing the behavior is right out. The question is whether
we want an additional "superlaptop"-mode.
And even in this case it seems to me that fsync() cannot be reduced to
a nop because of ordering constraints. But perhaps we should then consider
exporting an ordering primitive to user space.

	Regards
		Oliver
-- 
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SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) 
Maxfeldstraße 5                         
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Germany 
- - - 

  reply	other threads:[~2011-05-25  7:46 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-19 13:34 [rfc] Ignore Fsync Calls in Laptop_Mode Dennis Jansen
2011-05-19 13:43 ` Alan Cox
     [not found]   ` <BANLkTikFRwPY_qOQpPmCmNUJbBUsGcuGUw@mail.gmail.com>
     [not found]     ` <20110519153928.40521b93@lxorguk.ukuu.org.uk>
2011-05-19 15:01       ` D. Jansen
2011-05-19 15:02   ` D. Jansen
2011-05-20 15:34     ` Valdis.Kletnieks
2011-05-20  3:39 ` Dave Chinner
2011-05-20  6:01   ` D. Jansen
2011-05-22  0:48     ` Dave Chinner
2011-05-23  8:12       ` Oliver Neukum
2011-05-23 13:05         ` D. Jansen
2011-05-25  0:00         ` Dave Chinner
2011-05-25  6:50           ` Oliver Neukum [this message]
2011-05-26  7:01             ` D. Jansen
2011-05-26 10:49               ` Theodore Tso
     [not found]                 ` <BANLkTimNjt4=9v33Z9Nr12xa6GmyJ-Ue5A@mail.gmail.com>
2011-05-26 13:31                   ` Ted Ts'o
2011-05-26 16:05                     ` D. Jansen
2011-05-26 16:21                       ` Ted Ts'o
2011-05-27  7:12                         ` D. Jansen
2011-05-27 14:17                           ` Theodore Tso
2011-05-27 17:51                             ` david
2011-05-29 10:45                             ` D. Jansen
2011-05-30  1:53                               ` david
2011-05-30  7:13                                 ` Oliver Neukum
2011-05-30 12:55                                   ` Valdis.Kletnieks
2011-05-30 18:03                                     ` david
2011-05-30 13:55                                 ` D. Jansen
2011-05-30 18:02                                   ` david
2011-05-30 18:28                                     ` D. Jansen
2011-05-30 18:43                                       ` Valdis.Kletnieks
2011-05-30 19:54                                         ` D. Jansen
2011-05-30 18:45                                       ` david
2011-05-30 19:49                                         ` D. Jansen
2011-05-30 20:53                                           ` david
2011-05-30 21:24                                             ` D. Jansen
2011-05-30 22:41                                               ` david
2011-05-31  2:03                                               ` Ted Ts'o
2011-05-31  2:26                                                 ` david
2011-05-31 13:47                                                 ` D. Jansen
2011-05-31 18:23                                                   ` david
2011-05-31 18:37                                                     ` D. Jansen
2011-05-31 18:54                                                       ` david
2011-05-31 19:04                                                         ` D. Jansen
2011-06-02  7:42                                                 ` D. Jansen
2011-05-31  8:22                                               ` Valdis.Kletnieks
2011-05-30 22:10                                           ` Jesper Juhl
2011-05-31  6:48                                         ` Oliver Neukum
2011-05-26 19:31               ` Matthew Garrett
2011-05-27  7:22                 ` D. Jansen
2011-05-20 15:28 ` Valdis.Kletnieks
2011-05-20 16:40   ` D. Jansen
2011-05-20 22:03     ` torbenh
2011-05-21  8:23       ` D. Jansen
2011-05-23  8:22     ` Jesper Juhl

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